Murata CNC M2048LT CNC Turret Punch Press is widely used in the following fields due to its high accuracy, high efficiency and environmental friendly features:1.Automobile manufacturing It is used for the stamping of body structure parts (such as frames, doors, longitudinal beams), chassis parts and interior parts, and is especially suitable for the efficient forming of lightweight materials (such as aluminium alloys) for new energy vehicles.2. Home appliances and consumer electronics  We produce shells for home appliances (e.g. refrigerators, washing machine panels), electronic components (e.g. mobile phone shells, computer accessories) and precision sheet metal parts to meet the demand for high-precision and diversified designs.3.Aerospace    Processing aluminium alloy, titanium alloy and other high-strength materials for precision punching and forming of aircraft structural parts (e.g. wing parts, fuselage frames) to ensure consistency and safety of the parts.4.3C products (computer, communication, consumer electronics)  Applicable to the processing of small precision parts such as mobile phones and tablet PCs, supporting the efficient production of complex shapes and micro holes.5.General Machinery and Hardware Widely used in industrial equipment shells, hardware products, metal furniture and other fields to meet the demand for flexible production of multiple varieties and small batches.Equipment advantages support the application:  Servo drive technology: energy saving and high efficiency, low noise, suitable for production environment with high environmental protection requirements.  High-precision control: Ensure the machining accuracy of complex workpieces, especially suitable for size-sensitive electronic and aviation components.  Flexible mould change: Multi-station turret design supports quick mould change to adapt to diversified product demands.  With the trend of intelligent manufacturing, this equipment further improves productivity in automated production lines and becomes one of the core equipment in the metal processing industry.

Environmental factors on the Demagison precision machine tool accuracy to maintain a more significant impact, the following from the temperature and humidity, vibration shock, air quality and other aspects of the specific analysis: First, temperature and humidity Thermal expansion and contraction: machine tools are usually made of a variety of metal materials, the temperature changes every 1 ℃, the size of the metal parts may produce small changes. For example, for high-precision grinding, temperature changes may lead to thermal deformation of the workpiece and machine tool components, affecting the grinding accuracy, dimensional error may reach several microns or even higher. In precision milling, thermal elongation of the spindle may change the relative position of the tool and the workpiece, leading to a decrease in machining accuracy. Effect of humidity: When humidity is high, condensation is easily formed on the metal surface of the machine tool, which in turn triggers rust and corrosion, damaging the precision of the machine tool. Humidity changes may also make some non-metallic parts such as plastic, rubber parts deformation or aging, affecting its sealing performance and transmission accuracy. According to statistics, in the humidity for a long time more than 70% of the environment, the probability of corrosion of machine parts will increase by 30% - 50%, which may make the positioning accuracy of the machine tool in half a year down 10% - 20%. Second, vibration and shock External vibration interference: If the machine tool near a large stamping equipment, forging equipment or frequent passing heavy vehicles and other sources of vibration, vibration frequency and amplitude to a certain extent, will make the machine tool and the workpiece between the relative displacement. In precision boring, vibration may lead to an increase in the roundness error of the bore, surface roughness deterioration, roundness error may increase from a few microns under normal conditions to tens of microns. Vibration of the machine tool itself: When the machine tool is running at high speed, its internal motors, spindles, screws and other moving parts will also produce vibration. When the vibration is too large, it will affect the machining accuracy, such as in high-speed milling, the vibration may lead to milling surface vibration lines, reduce surface quality, positional accuracy may be reduced by 5% - 10%. Third, air quality Dust particles wear: dust and other pollutants into the interior of the machine tool, will be in the guide rail, screw and other moving parts between the formation of abrasive particles, accelerate the wear of components. Long-term work in a dusty environment, the wear rate of the machine tool guideway may be 2 - 3 times faster than in a clean environment, resulting in a decline in straightness and flatness accuracy of the machine tool. Oil mist and vapour effects: If the air contains a lot of oil mist or vapour, it may affect the normal operation of the machine tool's electrical system and sensors. For example, oil mist may adhere to optical sensors, resulting in incorrect signal transmission and a deviation in the machine tool's positioning accuracy, which may be several millimetres or more.

Demagison Precision Machine Tool accuracy to maintain the advantages of the play may be affected by the level of operators, the working environment, maintenance and other factors, as follows: First, the personnel factors Operator skill level: If the operator is not skilled in the operation of the machine tool, not familiar with the performance of the machine tool, parameters and operating procedures, may lead to misoperation in the machining process, such as programming errors, improper parameter settings, etc., thus affecting the machining accuracy, and can not give full play to the advantages of machine tool precision retention. Operator responsibility: the operator if the lack of responsibility, in the process of machining, do not carefully monitor the operating status of the machine tool, can not be found in time and deal with abnormalities occurring in the machine tool, such as tool wear, workpiece loosening, etc., these problems may gradually accumulate, affecting the accuracy of the machine tool to maintain sex. Second, the environmental factors Temperature and humidity: the temperature and humidity of the working environment of the machine tool changes too much, the machine tool parts will produce thermal expansion and contraction or moisture deformation and other phenomena. For example, in a high-temperature environment, the metal parts of the machine tool will expand, resulting in smaller gaps, affecting the precision of movement; and in a humid environment, some parts may rust, reducing the performance of the machine tool, which in turn affects the accuracy of retention. Vibration and shock: If the machine tool is installed in a location close to large power equipment, traffic routes or sources of vibration, the vibration of the surrounding environment may be transmitted to the machine tool, causing additional vibration during machining, affecting the relative positional accuracy between the tool and the workpiece, and leading to a decrease in machining accuracy. Air quality: dust, oil and other pollutants in the working environment, if they enter the interior of the machine tool, may block the lubricating oil path, affect the normal operation of the sensor, or form wear particles between moving parts, intensifying wear and tear of the components, thus affecting the accuracy of the machine tool to maintain. Third, the process and material factors Processing technology selection: unreasonable processing technology, such as improper selection of cutting parameters, processing sequence is unreasonable, etc., may make the machine tool in the process of machining to withstand excessive cutting force, torque and other loads, resulting in deformation or vibration of the machine tool, affecting the accuracy of retention. For example, too high a cutting speed may cause increased tool wear, which in turn affects the machining accuracy; too large a feed may make the machine tool drive system under excessive pressure, resulting in a decline in accuracy. Workpiece material characteristics: different workpiece materials have different hardness, toughness, coefficient of thermal expansion and other characteristics. If the processing of the workpiece material hardness is not uniform or coefficient of thermal expansion is large, in the process of machining may be due to the cutting force and cutting heat and produce a large deformation, thus affecting the machining accuracy, so that the machine tool to maintain the accuracy of the advantages of the machine tool is difficult to play. Fourth, equipment maintenance and maintenance factors Maintenance plan implementation: machine tools require regular maintenance, including the replacement of lubricants, cleaning filters, check the wear and tear of parts and components. 

The advantages of precision retention of Demagison Precision Machine Tools are more prominent in the following industries or application scenarios: I. Aerospace Engine component machining: Blades, impellers, engine cases and other components of aircraft engines require extremely high precision. Demagison Precision Machine Tools can maintain high accuracy during long machining times, ensuring that the blade surface shape, dimensional tolerances and surface finish meet the standards, resulting in excellent engine performance and stable operation. Structural parts manufacturing: Complex structural parts and precision connectors of spacecraft require high strength and reliability while being lightweight. Stable precision maintenance of machine tools can meet these requirements, reduce the risk of component quality caused by precision problems, and guarantee the safe operation of spacecraft in the space environment. Second, the field of automobile manufacturing Processing of key engine components: The key components of the engine block, cylinder head, crankshaft and connecting rods of automobiles directly affect the power performance, fuel economy and emission level of automobiles. With good accuracy retention, DEMAGISON machine tools ensure that the dimensional accuracy and tolerance of these parts meet the strict standards, which makes the engine run smoothly and powerfully, reduces the friction loss between the parts, and prolongs the service life of the car. Body Mould Manufacturing: The precision of the body mould determines the dimensional accuracy and appearance quality of the car body. Demagison Precision Machine Tools can maintain high precision for a long time in the process of mould processing to ensure the shape and dimensional accuracy of the mould, thus improving the forming quality of the body covering parts, making the assembly of the body more accurate, and improving the appearance quality and assembly processability of the whole car. Third, the field of medical equipment Surgical instrument processing: such as a variety of precision scalpels, tweezers, scissors and other surgical instruments, which require high-precision machining to ensure their dimensional accuracy, edge sharpness and surface quality. The precision retention of DEMAGISON precision machine tools can ensure the machining accuracy of these instruments and improve the accuracy and safety of surgical operations. Manufacturing of implants: Orthopaedic implants, cardiac stents and other medical devices that are implanted in the human body require a high degree of precision and biocompatibility. The stable precision of the machine tool can ensure the dimensional accuracy and surface finish of the implant, so that it can be better adapted to the human body tissues, reduce the rejection reaction, and improve the success rate of implantation surgery and the patient's quality of life. Fourth, the field of mould manufacturing Injection mould processing: In the manufacture of injection moulds, the precision of moulds directly affects the dimensional accuracy, appearance quality and moulding effect of plastic products. Demagison Precision Machine Tools are able to maintain high precision processing steadily for a long time to ensure the dimensional accuracy of mould cavities and cores, surface roughness and positional accuracy between each part, thus improving the moulding quality and productivity of plastic products and reducing the scrap rate.

Derma Gisen Precision machine tool accuracy to maintain good, in addition to the above mentioned machine tool structure design, manufacturing process and assembly accuracy, control system and compensation technology, maintenance and repair system, but also thanks to high-quality parts and components, advanced monitoring technology and strict quality control, specific analysis is as follows: First, the selection of high-quality components High quality of key components: In the selection of key components such as spindles and guide rails, Demagison Precision Machinery insists on using high-quality materials. For example, its spindle is usually made of high-strength, high-toughness alloy steel, which, after a special heat treatment process, has extremely high hardness and wear resistance and can maintain high-precision rotary motion for a long time. Excellent bearings and other accessories: The bearings, screws, nuts and other accessories used in the machine tools are all from well-known and high-quality suppliers. These accessories are characterised by high precision, low friction and high reliability, which can provide a strong guarantee for the motion precision of the machine tools. Take the high-precision bearings as an example, their clearance is controlled within a very small range, which can effectively reduce vibration and noise during the operation of the machine tool, ensure the smoothness of the moving parts, and thus improve the accuracy retention. Second, advanced monitoring and diagnostic technology Real-time precision monitoring: Demagison Precision Machine Tools are equipped with advanced precision monitoring systems, such as laser interferometer, ballbar and other monitoring equipment. These equipments can monitor the various accuracy indexes of the machine tools in real time, and once any deviation in accuracy is found, the system will immediately issue an alarm and provide detailed deviation data and location information, which is convenient for the operators to make adjustments and repairs in time. Fault early warning and diagnosis: Through the sensors installed in each key part of the machine tool, the system collects temperature, vibration, current and other data during the operation of the machine tool, and makes use of advanced data analysis algorithms and artificial intelligence technology to carry out real-time assessment of the machine tool's operation status and fault early warning. Can find potential faults in advance, take timely measures to repair, to avoid further development of faults leading to a decline in precision. Third, strict quality control system Comprehensive quality standards: Demagison Precision Machinery has established a set of strict and comprehensive quality control standards, covering every aspect from raw material procurement, parts processing, assembly to machine commissioning. Each process has detailed quality inspection standards and operation specifications to ensure that each component and each machine tool meets high quality requirements. Multiple rounds of inspection and testing: In the process of machine tool production, there are multiple rounds of strict inspection and testing. For example, after the machining of components is completed, high-precision three-coordinate measurement and other inspection means will be carried out to ensure that the dimensional accuracy and form and position tolerances of the components are in line with the standard. After the completion of the assembly of the whole machine, it will also carry out the precision testing of the machine, performance testing and long time run-in test, only the indexes have reached or exceeded the standard machine tool can be shipped, so as to ensure that the machine tool can be delivered to the use of the machine tool to maintain high precision for a long period of time.

Hexagon Optiv series composite image measuring instrument 443 model of the measurement accuracy and a variety of factors, in general its resolution up to 0.00001mm, reading accuracy of 0.0001mm. but the actual measurement accuracy may be measured by the shape of the object to be measured, the material, the surface characteristics of the environmental factors and the measurement method and so on. To improve the measurement accuracy of Hexagon 443 equipment, you can start from the calibration and maintenance of the equipment itself, the control of the measurement environment, the measurement of operational practices and software algorithms to optimise and so on, the following are specific methods: First, equipment calibration and maintenance Regular calibration: In accordance with Hexagon's recommendations and the requirements of the equipment manual, the equipment should be calibrated regularly, and it is generally recommended to carry out professional calibration every half a year or once a year. The calibration process should use high-precision standard gauges, such as standard blocks, standard balls, etc., to ensure that the measurement system of the equipment is accurate. Inspection of components: Regularly inspect the mechanical components of the equipment, including guide rails, screws, bearings, etc., to see if there is any wear and tear, looseness or accumulation of impurities. If the guide rail is found to be worn, repair or replace it in time; for loose screws or bearings, tighten or replace them to ensure the accuracy of mechanical movement. Clean the sensor: keep the optical sensor and contact sensor clean, avoid dust, oil and other pollutants attached to the sensor surface to affect the measurement accuracy. For optical sensors, special lens cleaning fluid and dust-free cloth can be used to gently wipe; contact sensors to check whether the probe is worn, if worn need to replace the probe in a timely manner. Second, the measurement environment control Temperature and humidity: the equipment is placed in a relatively stable temperature and humidity environment, the ideal temperature range is generally 20 ℃ ± 2 ℃, humidity in 40% -60%. Air conditioning and dehumidification equipment can be installed to regulate the environmental temperature and humidity, to reduce temperature and humidity changes on the equipment and the measured object. Vibration and airflow: Choose to install the equipment away from the source of vibration, such as large machinery and equipment, traffic avenues. If necessary, install vibration isolation pads or vibration isolation platform to reduce the interference of external vibration. At the same time, avoid using the equipment in places with strong airflow, such as air conditioning vents, near doors and windows, etc., to prevent airflow from affecting the measurement. Third, the measurement operation specification Correct clamping: According to the shape and characteristics of the object to be measured, choose the appropriate clamping tools and methods to ensure that the object to be measured in the measurement process is fixed firmly and accurately positioned to avoid excessive clamping force deformation of the object to be measured, affecting the results of the measurement. Reasonable planning path: Before measurement, according to the structure of the object to be measured and the measurement requirements, plan a reasonable measurement path and the distribution of measurement points to ensure that the measurement points can accurately reflect the actual size and shape of the object to be measured, to avoid measurement errors caused by too few or uneven distribution of measurement points. Stable operation: When operating the equipment, the movement should be smooth and slow, avoiding rapid movement or collision of the measuring parts of the equipment, especially in the use of contact measurement, the measuring force should be well controlled to avoid the measuring accuracy being affected by the measuring force being too large or too small.

The Hexagon 443 device refers to the Optiv Performance 443 composite image measuring instrument. It is a flexible and highly reliable measuring device, which is described below: I. Main Features Dual Z-axis design: Equipped with dual Z-axis, different sensors can be installed on two mutually independent vertical axes. When measuring complex 3D geometric quantities, the sensors can be operated alternately during the same measurement process, which further shortens the inspection cycle time and improves flexibility. Optical Sensor: Adopting a contactless strategy, the sensor can avoid deformation caused by contacting precision features, which can better protect the measured object, and is suitable for the measurement of deformation-sensitive precision parts. High-resolution camera: Low-noise, interference-free high-resolution and high-definition CCD camera for non-contact 3D image measurement, which can accurately reproduce the image and provide a clear image base for high-precision measurement. Image Processing Tools: Equipped with high performance and fast image processing tools, it can realise image autofocus, contour fast scanning mode, best fitting procedure and image and feature filtering function, which can complete the measurement task with the optical sensor under complex conditions. Optical lens and light: the optical lens can be automatically zoomed, can be equipped with fixed optical magnification or two-step zoom (2-step zoom); variable light, high contrast coaxial light, transmitted light, multi-segment surface ring light, according to the different measurement needs to provide the appropriate lighting conditions to improve the accuracy of the measurement. Second, the technical parameters: measurement range of 400mm × 400mm × 300mm, external dimensions of 862mm × 1310mm × 2185mm. Third, application areas: widely used in tablet computers, mobile phones and semiconductors, PCB boards, precision machining, medical, injection moulding, moulds, automotive parts and other industries, can be precise tiny parts, soft parts, thin-walled parts, and other complex features of the test.

The excellent performance of Demagison Precision Machine Tools in terms of accuracy retention is mainly due to the following aspects: I. Structural design of machine tools High rigidity structure: DMGI SENSEI machine tools adopt advanced structural design, such as DMU series 5-axis machining centre bed is usually made of high-quality cast iron material, which is optimized and designed by finite element analysis, with good rigidity and stability, which can effectively reduce vibration and deformation during machining, and ensure long-term machining accuracy. Stable mechanical transmission system: The transmission parts of the machine tool, such as ball screws, gears and racks, etc., are made of high-precision, highly wear-resistant materials and advanced manufacturing technology. Take CTX series turning centre as an example, its ball screw is precision ground and heat treated, with high transmission precision and low wear, which can maintain stable transmission performance for a long time and ensure the positioning accuracy and repeatability of the machine tool. Second, manufacturing process and assembly precision High-precision manufacturing: Demagit Sen Precision Machine strictly controls the manufacturing precision of each component in the production process. Key components such as spindle, guideway, etc., are manufactured with advanced machining equipment and technology to ensure that their dimensional accuracy and form and position tolerances are controlled within a very small range. For example, the round runout accuracy of the spindle can be controlled within 0.001mm, which provides the basis for high-precision machining. Precision assembly: the assembly process of the machine tool is carried out by professional technicians in accordance with strict assembly process and quality standards. During the assembly process, high-precision measuring instruments and tools are used to monitor and adjust the assembly precision of each component in real time. For example, CLX series of mill-turn compound machining centre, the perpendicularity and parallelism of each axis are precisely adjusted during the assembly to ensure the overall assembly accuracy of the machine tool, thus guaranteeing the accuracy retention. Third, the control system and compensation technology Advanced control system: Demagison Precision machine tools are equipped with advanced CNC systems, such as Siemens 840D sl or Heidenhain iTNC 640, etc. These control systems have strong computing power and precise control algorithms, which can accurately control the movements of the machine tools. At the same time, the control system also has real-time monitoring and diagnostic functions, can be timely found and corrected in the process of machine tool operation of small errors to ensure the stability of machining accuracy. Error compensation technology: The machine tool adopts a variety of error compensation technology, such as thermal error compensation, screw pitch error compensation. Taking DMU series as an example, by installing temperature sensors in the key parts of the machine tool, real-time monitoring of temperature changes and compensating the movement of the machine tool according to the relationship model between temperature and deformation, the impact of thermal deformation on accuracy is effectively reduced. The screw pitch error compensation technology, on the other hand, improves the positioning accuracy and repeatable positioning accuracy of the machine tool by measuring and compensating the pitch error of the ball screw. Maintenance Perfect maintenance plan: Demagison Precision Machinery provides users with perfect maintenance plan and technical support. According to the use of the machine tool and the working environment, we make personalised maintenance plan, and regularly inspect, clean, lubricate and replace parts and other maintenance work on the machine tool to ensure that the machine tool is always in good running condition. High-quality after-sales service: the company has a professional after-sales service team, which can respond to the user's needs in a timely manner and provide users with technical training, troubleshooting, spare parts supply and other comprehensive services. In the event of machine failure or precision degradation, the after-sales service personnel can quickly arrive at the scene to carry out maintenance and debugging to ensure that the machine tool is restored to its optimal state as soon as possible.

The precision of Derma Gyson Precision Machine Tools is at the leading level in the industry. The precision of different types of machine tools varies slightly, and the following are some common machine tools and their precision performance: I. Turning Centres CTX series: represented by CTX gamma 2000 TC, the cylindricity accuracy can usually reach within 0.01mm when turning external circles, and the hole diameter tolerance can be controlled at about ±0.005mm when performing high-precision boring processing, which is capable of realising precision rotary body parts processing. NLX series: such as NLX 2500/700, the precision is further improved by equipping with technologies such as ball screw centre cooling and double support form feed drive. When machining precision shaft parts, the accuracy of its diameter size can be controlled at ±0.003mm, and the accuracy of straightness can be up to 0.015mm per 300mm length. Machining Centre DMU series five-axis machining centre: the positioning accuracy can generally reach ±0.006mm, repeat positioning accuracy of ±0.004mm, can achieve high precision machining of complex curved surfaces, in the aerospace field of machining impellers, blades and other parts, to ensure that the contour of the blade profile error within 0.05mm. NHC Series Horizontal Machining Centres: In plane milling, the flatness accuracy can reach 0.02mm/300mm, and in hole system processing, the hole distance accuracy can be controlled within ±0.03mm, which is suitable for high-precision machining of box parts. Three, turning and milling compound machining centre CLX series: Turning and milling machining centre in the comprehensive processing of turning and milling, to ensure that the accuracy of the turning part is comparable to the turning centre, milling part of the accuracy is comparable to the machining centre. For example, CLX 450 can control the overall machining accuracy within ±0.05mm when turning and milling complex parts, which can meet the processing needs of medical equipment, energy and other industries for high-precision parts.

Judging whether the CNC system of a used CNC machine tool is normal or not can start from many dimensions such as appearance inspection, function test, performance evaluation, historical data analysis, etc. The following is the detailed introduction: First, appearance and connection check Appearance integrity: carefully check the shell of the CNC system for damage, deformation or obvious physical damage. If the shell is damaged, it may lead to the exposure of internal components, affected by dust, moisture, etc., thus affecting the stability and performance of the system. Connection condition: Check whether the connection cables between the system and the machine components are firm and not loose, broken or aged. For example, poor connection of the data cable may lead to data transmission errors, affecting the machining accuracy and stability of the machine tool. At the same time, observe whether there are signs of oxidation or corrosion at the interface, which may affect signal transmission. Display condition: Observe the display of the CNC system to see if there are scratches, bad dots, black screen or blurred display and other problems. A clear display is critical for the operator to accurately read machine status and parameters. If there is a problem with the display, it may lead to misoperation or failure to detect system faults in time. Second, the basic function test Power on and initialisation: Turn on the CNC system and observe whether the power-on process is normal and whether there is any alarm message. Under normal circumstances, the system should be able to complete the initialisation within the specified time and enter the operation interface smoothly. If there is an alarm message, it is necessary to consult the system manual according to the alarm code to determine the cause of the fault. Parameter setting and reading: Try to read and modify some basic parameters of the system, such as the travelling range of the coordinate axes, feeding speed, spindle speed, etc. Check whether the parameter settings can be saved and read normally, and whether the modified parameters can take effect in machine operation. If there is a problem with the parameter setting, it may lead to abnormal machine operation. Manual Operation Function: Use the manual operation mode to control the forward and reverse movement of each coordinate axis of the machine tool and observe whether the movement is smooth, with or without any stuttering, jittering or abnormal noise. At the same time, test the spindle's forward and reverse rotation, speed regulation and other functions to ensure that all functions of manual operation are normal. Automatic operation function: Select a simple machining programme and let the machine tool run automatically. Observe whether the system can read the programme correctly and control the machine tool to process according to the programme requirements. During the running process, pay attention to whether the action of the machine tool is consistent with the programme, and whether there is any situation such as stopping in the middle, skipping steps or executing errors. Third, the system performance evaluation Response speed: When operating the CNC system, feel its response speed, including the reaction time after instruction input, the start and stop speed of the coordinate axis movement. Fast and accurate response is an important performance of good CNC system performance. If the response speed is too slow, it may affect the machining efficiency and accuracy of the machine tool. Stability: run the machine for a long time, observe the stability of the CNC system in the continuous work process. Check whether there will be a system crash, automatic restart or frequent alarms and other problems. A stable system is the key to ensure normal production of the machine tool. Data processing ability: You can test the data processing ability of the system by running some complex machining programmes. Observe whether the system can remain stable when processing large amounts of data, and whether there are phenomena such as slow running procedures and lost steps. Fourth, the history of records and troubleshooting Check the alarm records: Check the alarm records of the CNC system to understand the fault information that has occurred in the past of the equipment. Analyse the frequency, type and time of occurrence of alarms to determine whether there are potential problems or recurring faults. If certain faults occur frequently, it may indicate a serious problem with the system that requires further inspection and repair. Enquire about usage: Find out from the seller or the original user the usage history of the CNC system, including whether there are frequent faults, how the faults were handled, and whether there have been any system upgrades or repairs. This information can help you get a more comprehensive understanding of the system's condition. Professional testing equipment to assist: If possible, you can use professional CNC system testing equipment to carry out a comprehensive test of the system. These devices can detect the electrical performance of the system, signal transmission and other parameters, to help accurately determine whether there is a potential failure of the system hidden danger. 

When buying used CNC machine tools, you can judge the accuracy of the equipment from the machine's own accuracy test report, the condition of the key components, the performance of the trial machining, etc., the following is the specific method: First, check the accuracy test report Factory report: Check the factory accuracy inspection report of the machine tool to understand the precision indicators of the machine tool in the factory, including geometric accuracy, positioning accuracy, repeat positioning accuracy and so on whether it meets the standard. But pay attention to the timeliness of the report, time may not reflect the current accuracy. Recent test report: If the seller can provide a recent accuracy test report issued by a professional testing organisation, the credibility is higher. This report usually lists in detail the measured data of various precision indicators, according to which the current precision status of the machine tool can be judged. Second, check the key components Guide rail: the guide rail is one of the key components affecting the accuracy of the machine tool. By observing the guideway surface whether there are obvious signs of wear, scratches, strains, etc., but also can be touched to feel the flatness and smoothness of the guideway surface. If the guide rail is seriously worn, it will lead to unstable movement of the table, affecting the machining accuracy. Screw: the accuracy of the screw directly affects the positioning accuracy and feed accuracy of the machine tool. To check whether the screw is worn or deformed, you can shake the table or coordinate axis by hand to feel whether the screw rotates smoothly and whether there is any phenomenon such as stagnation and excessive clearance. Can also use the percentage table and other tools to measure the axial runout and radial runout of the screw. Spindle: the rotary accuracy of the spindle is critical to the machining accuracy. Check the radial runout and axial runout of the spindle, can be fixed in the machine bed or other fixed parts of the per centimeter, the head contact spindle end or journal, rotate the spindle, observe the per centimeter reading changes. Generally speaking, high-precision machine tool spindle radial runout and axial runout should be within a few microns. Third, the trial machining test Processing simple shape parts: let the machine tool to process some simple shape parts, such as square, cylinder, etc., and then use the gauge (such as calipers, micrometers, coordinate measuring machine, etc.) to measure the dimensional accuracy of the parts, shape accuracy and positional accuracy, to check whether the processed parts meet the design requirements. Detection of complex contour machining: carry out complex contour machining tests, such as machining a part with a variety of curves and surfaces, and observe the performance of the machine tool in the machining process, such as whether it can accurately process according to the programmed trajectory, and whether there is any distortion of the contour, surface roughness and other problems. By testing the machining of complex contours, the accuracy and performance of the machine can be more comprehensively assessed. Evaluation of machining surface quality: Observe the surface quality of the machined parts, such as whether there are cut marks, ripples, burrs, etc.. Good machine accuracy usually produces parts with a high surface finish and uniform texture. If the surface quality is poor, it may be insufficient machine tool accuracy, or it may be the tool, cutting parameters and other issues that need to be further analysed and judged. Fourth, running performance testing Coordinate axis motion accuracy detection: through the CNC system commands, so that the coordinate axis for rapid movement and positioning operations, to observe whether the movement of the coordinate axis is smooth, accurate, there is no vibration, creep and other abnormal phenomena. Professional equipment such as laser interferometer can be used to measure the positioning accuracy and repeat positioning accuracy of the coordinate axes. Automatic tool changer system testing: For CNC machine tools with automatic tool changer function, check the accuracy and reliability of the automatic tool changer system. Carry out multiple tool change operations and observe whether the tool exchange is accurate, whether there are any problems such as dropped tools and tool positioning deviation.

When you buy used hobbing machine, you need to consider from the overall condition of the equipment, performance and accuracy, related information and trading after-sales and other aspects, in order to ensure that you buy the equipment that meets the needs of reliable quality. The following is a detailed introduction for you: 1. **Inspection of the overall condition of equipment**     - **Appearance Inspection**: Look carefully at the appearance of the hobbing machine and check whether there are obvious bumps, deformation, rust and corrosion. Pay particular attention to the appearance condition of key parts such as work table, column, tool holder, etc., because damage to these parts may affect the accuracy and stability of the equipment. For example, if there are deep scratches or deformations on the surface of the table, it may lead to inaccurate positioning of the workpiece during machining, thus affecting machining accuracy.     - **Mechanical Component Inspection**: Carry out a comprehensive inspection of the mechanical components of the hobbing machine to assess the degree of wear and working condition. Focus on checking the transmission parts such as guide rails, screws, gears, racks, etc., to see if the surfaces of these parts are abraded, strained, flaked, etc., and to measure whether their dimensional accuracy is within the specified range. For example, the wear of the guide rail will lead to a decrease in the motion accuracy of the table, affecting the dimensional and shape accuracy of the machined parts; the wear of the screw will lead to an increase in the pitch error, affecting the feeding accuracy of the tool. In addition, it is also necessary to check whether the rotary accuracy of the spindle, axial runout and other indicators are in line with the requirements, because the performance of the spindle directly affects the accuracy and surface quality of the machined parts.     - **Electrical system check**: the electrical system is a key component of the normal operation of the hobbing machine, so when you buy a second-hand hobbing machine, you need to carry out a detailed inspection of the electrical system. First of all, check whether the electrical components in the electrical control cabinet are complete, there is no damage, aging, burning and other phenomena, to see whether the connection of each electrical component is firm, there is no loose, false connection and other cases. For example, if the contacts of the contactor are worn, burnt, etc., it may lead to poor contact of the circuit, affecting the normal operation of the equipment; if the coil of the relay is aged, short-circuited, etc., it may lead to the failure of the relay to work properly, thus affecting the control function of the equipment. Secondly, check whether the wiring of the electrical system is neat and standardised, and whether there are any safety hazards such as breakage and leakage. Finally, power on and test whether the functions of the electrical system are normal, including the functions of starting, stopping, forward and reverse rotation, speed regulation, etc., and check whether the operation interface of the control system is clear and sensitive, and whether there are any fault alarm messages, etc. 2. **Performance and precision assessment**     - **Machining accuracy test**: Machining accuracy is one of the important indexes to measure the performance of the hobbing machine, so when you buy a used hobbing machine, you need to test its machining accuracy. You can use standard gears or test pieces for processing, and then use gear measuring instruments, coordinate measuring instruments and other testing equipment to measure the processed gears or test pieces to assess whether its various precision indicators meet the requirements. For example, measuring the gear pitch deviation, tooth shape error, helix error and other accuracy indexes to assess the accuracy maintaining ability of the hobbing machine in processing gears; measuring the dimensional accuracy, shape accuracy and other indexes of the specimen to assess the accuracy level of the hobbing machine in processing general parts.     - **Motion accuracy check**: motion accuracy refers to the accuracy of each moving part of the hobbing machine in the process of motion, which directly affects the accuracy and surface quality of the processed parts. Therefore, when buying a used hobbing machine, you need to check its motion accuracy. You can use laser interferometer, ballbar and other testing equipment on the hobbing machine table, column, tool holder and other moving parts of straightness, verticality, flatness, roundness and other movement accuracy indicators to measure, assess whether it meets the requirements. For example, use the laser interferometer to measure the straightness error of the table in the X, Y direction to assess the straightness accuracy of the table in the movement process; use the ballbar to measure the roundness error and radial runout error of the tool holder in the process of rotary movement to assess the accuracy of the tool holder in the process of rotary movement.     - **Cutting performance test**: Cutting performance refers to the ability and performance of the hobbing machine in the cutting process, which directly affects the processing efficiency and processing quality. Therefore, when buying a second-hand hobbing machine, you need to test its cutting performance. You can use the actual workpiece for cutting processing, observe the hobbing machine in the cutting process of stability, reliability, cutting force, cutting heat, etc., to assess whether its cutting performance meets the requirements. For example, in the cutting process, observe the hobbing machine table whether there is obvious vibration, tool holder whether there is loose, displacement and so on, to assess the stability and reliability of the hobbing machine in the cutting process; the use of force measuring instrument to measure the size of the cutting force and changes in the situation, to assess the hobbing machine in the cutting process of the cutting force control ability; the use of infrared thermography to measure the distribution of the cutting heat and the changes in the situation, to assess the hobbing machine in the cutting process of the heat dissipation ability. cutting process of heat dissipation ability and thermal stability.       - **Use and Maintenance Records**: Use and maintenance records are an important basis for understanding the historical condition of a used hobbing machine, so when purchasing a used hobbing machine, it is necessary to obtain the equipment's use and maintenance records from the seller and review them carefully. Records of use should include information such as when the machine was started, how often it was used, and the types and quantities of parts processed. By reviewing the records of use, it is possible to understand the use of the machine and its workload, and to assess the degree of wear and remaining service life of the machine. Maintenance records should include information such as the maintenance time of the equipment, the content of the maintenance, the parts replaced, and the cost of the maintenance. By reviewing the maintenance records, it is possible to understand the maintenance history and failure of the equipment, assess the reliability and stability of the equipment, and determine whether there is a potential quality problem with the equipment. For example, if the maintenance records show that the equipment has frequently failed in the recent past, and the maintenance content involves the replacement of key components, then this may indicate that there are serious quality problems with the equipment, which need to be carefully considered when purchasing.     - **Equipment data integrity**: equipment data is the correct use, maintenance and management of the hobbing machine is an important basis for the purchase of second-hand hobbing machine, you need to ensure the integrity of the equipment data. The equipment data should include the equipment's original manual, operation manual, maintenance manual, electrical schematic diagrams, hydraulic schematic diagrams, parts diagrams, quality inspection reports, certificates of conformity and other documents. When purchasing the equipment, you need to ask the seller for these documents and check them carefully to ensure the completeness and accuracy of the documents. For example, if the electrical schematic diagram or maintenance manual of the equipment is missing, it may bring great difficulties to the maintenance personnel when the equipment breaks down, and even make it impossible to carry out maintenance. Therefore, ensuring the completeness of the equipment information is one of the issues to focus on when buying a used hobbing machine. 4. **Transaction and after-sale guarantee**     - **Price Assessment and Negotiation**: When buying used hobbing machine, price assessment is a very important part. Need through a variety of ways to understand the market of the same type, the same specifications of the second-hand hobbing machine price quotations, for example, you can consult the second-hand equipment dealers, check the second-hand equipment trading platform information, participate in industry exhibitions, so as to purchase the second-hand hobbing machine price has a reasonable expectation. In the understanding of the market price on the basis of the need to buy a second-hand hobbing machine for a comprehensive inspection and assessment, including the overall condition of the equipment, performance and accuracy, use and maintenance records, equipment data integrity, etc., according to the results of the inspection and assessment of the actual value of the equipment, and based on this price negotiation with the seller. In the price negotiation process, you need to fully understand the seller's psychological bottom line and price expectations, and at the same time, you should be good at using negotiation skills, such as reasonably put forward their own needs and concerns, looking for common interests of the two sides, and make concessions at the right time, etc., in order to strive to reach a reasonable price that both sides can accept.     - **Contract signing and clear terms**: After agreeing with the seller on the price of the second-hand hobbing machine and other trading conditions, it is necessary to sign a formal contract of sale to ensure that the rights and interests of both parties are legally protected. Before signing the contract, you need to carefully review the terms of the contract to ensure the completeness, accuracy and legality of the contract terms. The contract terms should include the following:         - **Basic equipment information**: including the name of the equipment, model, specifications, manufacturer, factory date and other information to ensure that the basic information of the equipment is accurate.         - **Price and Payment Methods**: specify the price of the equipment, payment methods, payment time nodes and other information to ensure that both parties agree on the price and payment methods.         - **Delivery time and location**: Define the delivery time, delivery location, mode of transport and other information of the equipment to ensure that the equipment can be delivered on time and safely to the location specified by the buyer.         - **Quality assurance and after-sales service**: Define the seller's responsibility for quality assurance of the equipment, quality assurance period, after-sales service content, after-sales service response time and other information, to ensure that the buyer can get timely and effective quality assurance and after-sales service support in the process of using the equipment.         - **Liability for breach of contract and dispute resolution**: Define the liability for breach of contract and the way of compensation for breach of contract between the two parties in the process of contract performance, and at the same time determine the way of resolving contract disputes, such as negotiation, arbitration or litigation, etc., so as to ensure that when disputes arise in the process of contract performance, there can be a clear way of resolving the disputes and the way of resolving the disputes.     - **After-sale guarantee and service quality**: After-sale guarantee and service quality is one of the issues that need to be focused on when buying a used hobbing machine, which is directly related to the stability, reliability and service life of the equipment in the process of use, but also related to the buyer's production efficiency and economic benefits. Therefore, when buying used hobbing machine, you need to choose a seller with good after-sales guarantee and service quality. A seller with good after-sale guarantee and service quality should have the following characteristics:         - **Professional technical team**: have a professional technical team, including mechanical engineers, electrical engineers, maintenance technicians, etc., they have a wealth of experience in equipment maintenance and repair, can timely and accurately determine the cause of equipment failure, and take effective maintenance measures to ensure that the equipment can be restored to normal operation as soon as possible.         - **Perfect after-sales service system**: A set of perfect after-sales service system has been established, including after-sales service hotline, online customer service, after-sales service mailboxes and other contact information, so as to facilitate the buyer in the use of equipment encountered in the process of the problem in a timely manner to get in touch with the seller. At the same time, the seller should also develop a detailed after-sales service process and standards to ensure that after-sales service work standardisation, standardisation and efficiency.         - **Adequate spare parts supply**: having sufficient spare parts inventory can provide the buyer with the required spare parts in a timely manner to ensure that the equipment can be repaired in a timely manner in the event of failure, reduce equipment downtime and improve production efficiency. At the same time, the seller should also establish a sound spare parts management system, the procurement, acceptance, storage, issuance, use of spare parts and other aspects of strict management, to ensure the quality and timeliness of the supply of spare parts.         - **Regular visit and equipment maintenance**: Regularly visit the buyer to understand the use and operation of the equipment, collect the buyer's opinions and suggestions in a timely manner, and continuously improve and perfect the after-sales service work. At the same time, the seller should also according to the use of equipment and operating conditions, develop a reasonable equipment maintenance plan, regularly provide the buyer with equipment maintenance services, including equipment cleaning, lubrication, fastening, adjusting, testing and other work, to ensure that the performance and accuracy of the equipment is always maintained in a good state, to extend the service life of the equipment.        To sum up, the purchase of used hobbing machine needs to comprehensively and meticulously consider the above aspects, and combined with their own actual needs and budget for comprehensive assessment and decision-making. In the process of purchase, if you do not know much about certain technical issues or equipment condition, it is recommended to consult professional technicians or used equipment evaluation agencies to obtain more accurate and professional advice and guidance to ensure that you can buy a used hobbing machine that meets the needs of reliable quality and cost-effective.