Used car milling composite is a second-hand CNC equipment that integrates turning and milling into one machine tool. Here is some information about it: 1、 Popular brands and models Ha Ting CONOUEST T42: an American brand with a bar passing capacity of 42mm, a spindle speed of up to 6000rpm, a processing length of 368mm, a processing diameter of 226.3mm, and equipped with a Fanuc 18T system. Mazak INTEGREX50: a Japanese brand with multi axis linkage function, which can achieve efficient processing of complex parts, good system stability, high processing accuracy, and is widely used in aerospace, precision molds and other fields. Demage CTX310: A German brand known for its high precision and stability. The machine tool has good rigidity and can adapt to the processing of various materials. It has an advanced CNC system, a user-friendly interface, and easy programming. 2、 Price Range Mid to low end: Some small and medium-sized domestic brands or second-hand car milling composites with long service life and average precision may cost between 100000 and 300000 yuan. Mid to high end: Common imported brands or well-known domestic brands, used for about 3-5 years, with good condition and high configuration, generally priced between 300000 and 800000 yuan. High end: Large, high-precision second-hand car milling composites from high-end imported brands such as Mazak and Demage may cost over 800000 yuan, even exceeding 1.5 million yuan. 3、 Purchase precautions Equipment inspection: Check whether the appearance of the equipment is deformed, bumped, corroded, etc., whether the internal mechanical structure such as guide rails, screw rods, etc. is worn, whether the electrical components of the electrical system are aged or damaged, whether the control system is normal, whether the accuracy, sound, and temperature of the spindle system are normal, and whether the tool changing action of the tool system is accurate and smooth. Performance evaluation: Understand the production year and usage duration of the equipment, prioritize selecting well-known brands and equipment with good reputation, and request trial processing to observe whether the processing accuracy, efficiency, etc. meet the requirements. Data procedures: The seller is required to provide the original factory manual, operation manual, maintenance manual, accuracy inspection report, factory certificate of conformity, etc. of the equipment to ensure that the source of the equipment is legal, and the customs declaration form, tariff payment certificate, and other procedures for imported equipment are complete. After sales service: Understand market prices, avoid buying at high prices, sign detailed contracts, clarify equipment models, specifications, prices, delivery time, quality standards, after-sales service and other terms, choose sellers who can provide after-sales services such as installation and commissioning, training, and maintenance during the warranty period, and have short repair response time and strong repair capabilities.

There are many differences in the quality and performance of second-hand diamond drilling machines from different brands. Here are some common situations: 1、 Brother In terms of quality: As a Japanese brand, Brother is known for its rigorous manufacturing processes and high-quality components. The stability and reliability of the equipment are very high, and the body structure is sturdy, which can maintain high-precision processing for a long time. It has strong durability and is not prone to failure. In terms of performance, the power of the spindle motor is generally around 10kW, providing strong power and meeting the processing needs of various materials. Equipped with high-precision transmission and control systems, such as the B00 system, it can achieve fast and accurate positioning and processing, with processing accuracy controlled at around 0.01mm. 2、 Taigang In terms of quality: As a well-known domestic brand, Taiqun Precision Machinery has a certain guarantee of quality, using high-quality castings and key components. After strict quality testing, the overall stability of the equipment is good, which can meet daily production and processing needs. In terms of performance, represented by the T-500 series, the spindle speed can reach 20000-24000rpm, with high cutting efficiency. Equipped with Mitsubishi M70, M80 and other systems, it has a user-friendly interface and easy programming. It performs well in the field of 3C product processing, with a processing accuracy of generally up to 1 thread. 3、 Yang Sen In terms of quality: The quality is relatively reliable, with a certain user base in the domestic market, focusing on the practicality and stability of the product, with a reasonable body structure design that can withstand certain processing loads. In terms of performance, the main spindle speed of the Yangsen T700 is 20000rpm, and the three-axis stroke is 700 * 400 * 350mm, which has a large machining range and can meet the needs of some large parts or those requiring large stroke machining. The main motor power is 18kW, providing strong cutting power and suitable for processing various materials. 4、 Tsugami In terms of quality: A Japanese brand known for its excellent quality and high precision and reliability. The equipment is manufactured with advanced technology, and the precision and durability of its components are high, making it suitable for long-term high-precision machining tasks. In terms of performance, such as the Jinshang VA2 high-speed precision drilling and tapping machine, the spindle speed can reach 30000rpm, with extremely high processing speed and accuracy, suitable for the processing of ultra precision parts such as micro holes and small holes. It adopts the Fanuc MD system, with high control accuracy, and can achieve efficient processing of complex parts.

When purchasing a second-hand drilling machine, it is necessary to consider multiple aspects such as the condition of the equipment itself, relevant documents and procedures, and after-sales service. The following are specific issues to be noted: 1、 Equipment condition Appearance and mechanical structure: Carefully inspect the body for deformation, cracks, severe corrosion, and ensure that protective doors, sheet metal parts, etc. are intact. Check the wear of key transmission components such as guide rails and screw rods. If there are severe wear, scratches, strains, etc., it will affect the machining accuracy and equipment life. It is also necessary to check whether the workbench is flat, free from bumps, scratches, deformations, etc., which will directly affect the clamping and processing quality of the workpiece. Electrical system: Check the electrical components inside the electrical cabinet for signs of aging, damage, or burning, and for any safety hazards such as damaged or exposed wires. Test the control system of the equipment, check whether the buttons and knobs on the operation panel are sensitive and effective, whether the display screen is displaying normally, and whether the system has alarm information. Spindle system: Start the spindle and listen for a smooth and even running sound, as well as any abnormal noise or vibration. By touching the spindle housing with your hand, you can feel if the temperature is too high and check the accuracy of the spindle, such as radial runout and axial displacement. Generally, tools such as a dial gauge can be used for detection. If the accuracy deviation is too large, it will affect the machining accuracy. Tool system: Check whether the tool changing action of the tool magazine is accurate and smooth, and whether there are any stuck or dropped tools. Check the degree of tool wear, and if the tool is severely worn, consider the cost of replacement. It is also necessary to confirm the accuracy of the fit between the tool holder and the spindle. If the fit is not good, it will affect the clamping accuracy and machining stability of the tool. 2、 Information and procedures Equipment information: The seller is required to provide the original factory manual, operation manual, maintenance manual, etc. of the equipment, which are very important for the operation, maintenance, and troubleshooting of the equipment. It is also necessary to check the accuracy inspection report, factory certificate and other quality certification documents of the equipment to understand the accuracy and quality status of the equipment when it leaves the factory. Legal procedures: Ensure that the source of the equipment is legal, require the seller to provide purchase invoices, proof of ownership, etc., to avoid purchasing equipment with unknown sources or legal disputes. For imported equipment, it is necessary to check whether the import customs declaration form, proof of tariff payment, and other procedures are complete to prevent equipment from being unable to be used or transferred due to procedural issues. 3、 Trading and after-sales service Price and Contract: Before purchasing, conduct market research, consult peers, and other methods to understand the market price of second-hand drilling machines of the same model and service life, in order to avoid buying at a high price. Sign a detailed purchase contract, specifying the model, specifications, quantity, price, delivery time, quality standards, after-sales service, and other terms of the equipment, as well as the rights and obligations of both parties. If necessary, consult a lawyer or professional. After sales service: Understand whether the seller provides after-sales service, such as equipment installation and commissioning, training, maintenance during the warranty period, etc. Inquire about the seller's repair response time and repair capability to ensure timely repair in case of equipment failure. The seller can also be requested to provide a certain period of warranty service, clarifying the scope of warranty and maintenance responsibilities during the warranty period.

The following are some ways to identify the true newness and oldness of used Jinshang walking machine:  a. Appearance check the  shell of the equipment: carefully look at the overall appearance of the equipment, check the shell whether there are scratches, knocks, paint loss, rust and other traces. For lightly used equipment, there may be only a small number of minor scratches; while the use of longer or improperly maintained equipment, the shell may have more obvious damage. Screen and operating panel: Observe whether the screen of the operating panel has scratches, wear and tear, colour difference, bad dots and other problems. Brand new or shorter use of the device, the screen is usually clear, no scratches, good display; if the screen has obvious scratches or display abnormalities, the device may be used frequently or not well protected. At the same time, check the operating buttons, knobs, etc. whether there is wear and tear, loose or fuzzy writing, if the button surface logo has been blurred, it is likely to be a long time due to frequent use. Interfaces and cables: Check the various interfaces of the device, such as power interface, data cable interface, hydraulic interface, etc., to see whether there is wear and tear, deformation, oxidation or insertion marks and other signs of use. If there is obvious oxidation discolouration of the metal part around the interface, it means that the equipment has been used for a long time and may be in a more severe working environment. In addition, check whether the cable connecting the device is broken, aging, hardening, etc., the aging of the cable may be a security risk, but also indirectly reflect the age of the device. Second, the system software to check the  software version: boot start the device, view the software version of the CNC system. Newer equipment usually installs relatively new system software, and equipment that has not been updated for a long time may have been used for a long time. You can ask Tsugami for the latest software version for that model of equipment to make a comparative judgement. System Setup Parameters: Check the various parameter settings in the system, such as machining parameters, tool parameters, and axis parameters. If these parameters have been frequently modified or adjusted, it may mean that the equipment has been used for a lot of machining. In addition, check the equipment's working time records, fault alarm records and other system logs, from which the actual use of the equipment and maintenance history. Procedure storage: Check the program storage space of the device, if which stores a large number of processing procedures, and the creation of the programme time span is large, indicating that the device may have been used for a longer period of time and undertake more processing tasks. Third, the hardware configuration check  spindle system: check the accuracy of the spindle, you can use a micrometer and other professional tools to measure the radial runout of the spindle and axial runout, new equipment or use a shorter period of time, the spindle accuracy should be in the provisions of the high-precision range, such as radial runout is generally in the range of 0.005-0.01mm, axial runout is less than 0.005mm; and the use of a long period of time of the device, the accuracy of the spindle may be will decline. You can also check the spindle motor, bearings and other components, to see whether the appearance of the motor has signs of wear, overheating and discolouration, and whether the bearings are loose, abnormal noise and other problems. Turret components: Observe the appearance of the turret for wear and scratches, especially on the tool holder and tool clamping parts. Check whether the knife tower's knife change action is accurate, rapid and smooth, and whether there is any abnormal sound or jamming phenomenon in the process of knife change. The turret of new equipment usually moves accurately and smoothly during tool change, while the turret that has been in use for a long time may have problems such as deviation of tool position and prolonged tool change time. Guide rail and screw: Use a level or other tools to check the straightness and parallelism of the guide rail, as well as the transmission accuracy of the screw. The guide rail and screw of the new equipment have higher precision and run smoothly; the used equipment may be worn out and lead to loss of precision, crawling, vibration and other phenomena. Fourth, the transmission parts of the inspection  gear and rack: check the gear and rack mesh, see whether the tooth surface wear, deformation, lack of teeth and other issues. New equipment, gear and rack meshing tight, smooth transmission; long time equipment, the tooth surface may appear wear marks, meshing will produce a gap, resulting in decreased transmission accuracy and increased noise. Belt and chain: Check the tightness and wear of the belt and chain. If the belt or chain appears obvious slack, wear and tear, cracks and other problems, it means that the equipment has been running for a long time, need to be replaced in a timely manner, otherwise it will affect the transmission efficiency and stability of the equipment. Fifth, the key components to check the  electrical components: check the electrical components such as wires, relays, contactors, switches, etc. inside the equipment to see if there is wire aging, cracking, oxidation, rust and other phenomena. Aging wires may have short-circuit, circuit breakage and other safety hazards, while oxidised and rusted electrical components may affect the normal operation of the equipment. Hydraulic and lubrication system: check the hydraulic system of oil pumps, cylinders, tubes and other components to see whether there is oil leakage, oil seepage phenomenon, the colour of the hydraulic oil is black and dirty. The hydraulic oil of new equipment is usually clear and transparent, while the equipment used for a long time, the hydraulic oil will be discoloured due to pollution. At the same time, check the grease or lubricant of the lubrication system, if the lubrication parts are dry, coking or blackened grease, etc., it means that the lubrication system of the equipment is not maintained in a timely manner, and the equipment may be used for a longer period of time.

The price of used Tsunami centring machines varies due to a variety of factors, the following is the general situation:   a.   BO205 series by model   : such as BO205-III, the general price of 50,000 to 100,000 yuan or so. This series of centring machine is suitable for processing smaller size precision parts, such as small shafts, sets of parts, etc., in some small precision machining enterprises or electronic parts processing enterprises in the application of more.   BO265 series: like BO265-II, the price is usually around 80,000 RMB to 150,000 RMB. The processing diameter of this type of centrifugal machine is relatively large, can process parts with a diameter of 8-26mm, there is a certain increase in processing capacity and accuracy, commonly used in the processing of slightly larger size of precision parts, such as small mechanical parts, medical equipment parts.   BO325 Series: The price of used BO325-II is around 100,000 RMB to 200,000 RMB. This series has excellent performance in processing accuracy and stability, can meet the higher precision requirements of parts processing, applicable to aerospace, automotive parts and other areas of high precision requirements.   Second, according to the degree of newness   about 80% new: the price is generally about 40% -60% of the price of new equipment. For example, if the price of a new Tsugami BO265-II centring machine is about 300,000 RMB, then the price of the same machine in 80% new condition may be between 120,000 RMB and 180,000 RMB.   90% new and above: the price may reach about 60%-80% of the price of new equipment. For some of the use of a shorter period of time, better maintained 90% new equipment, its price is relatively high, but the performance and accuracy is also closer to the new equipment.   Third, according to the configuration of the   standard configuration: usually the price is near the lower limit of the above price range. The standard configuration of the second-hand Jinshang centring machine can meet the basic processing needs, applicable to some of the processing requirements are not particularly high enterprises or processing tasks.   High-configuration models: Used centring machines with advanced configurations such as automatic feeding devices, special tooling systems, high-precision measuring systems, etc., may be priced at about 20%-50% higher than standard configurations. These high-compatibility models have greater advantages in processing efficiency, precision and automation, etc., and are suitable for enterprises with higher requirements for processing quality and productivity.

Here are some methods for evaluating the machining accuracy and performance stability of second-hand walking machines: 1、 Processing accuracy evaluation Geometric accuracy detection: -Spindle accuracy: Use a dial gauge to check the radial runout and axial displacement of the spindle. For walking machines, the radial runout of the main shaft should generally be controlled within 0.005-0.01mm, and the axial displacement should be less than 0.005mm. It is also possible to insert a core rod into the spindle and use a dial gauge to measure the radial and axial runout of the core rod, in order to more intuitively reflect the accuracy of the spindle in actual work. -Guide rail accuracy: Check the straightness, parallelism, etc. of the guide rail using level measurement method, autocollimator measurement method, or laser interferometer measurement method. The level can measure the overall straightness of the guide rail; Autocollimators are suitable for detecting straightness errors over long distances with high accuracy; Laser interferometers can be used for various types of machine tool guides and have lower requirements for environmental conditions. -Tower accuracy: Check the tool position accuracy of the tower by installing standard tools and measuring the tool position accuracy using a dial gauge. The tool position accuracy error should be controlled within a small range, such as ± 0.01mm. You can also conduct a tool change test to observe the accuracy and repeatability of tool tower tool changes. Work accuracy detection: -Trial machining inspection: Select appropriate materials and simple machining processes for trial machining, such as machining a small shaft or sleeve part. During the trial machining process, observe the machining status of the equipment, including whether the cutting sound is normal and whether the chip discharge is smooth. At the same time, use measuring tools to measure the accuracy of processed parts, such as dimensional accuracy, shape accuracy, and surface roughness, to ensure compliance with requirements. -Hole machining accuracy testing: If the drilling machine has functions such as boring and drilling holes, it can perform hole machining accuracy testing. Measure the dimensional accuracy, roundness, cylindricity, and positional accuracy between holes. For high-precision walking machines, the dimensional accuracy of the holes can be controlled within ± 0.005mm, and the roundness and cylindricity errors should be less than 0.003mm. -Thread machining accuracy testing: Conduct thread machining tests to check the pitch accuracy, profile accuracy, and surface roughness of threads. Using tools such as thread plug gauges, thread ring gauges, or coordinate measuring instruments for measurement, the pitch accuracy error should generally be controlled within ± 0.005mm. 2、 Performance stability assessment Observation of operational stability: -No load operation test: Let the equipment run without load for a period of time, observe the overall operation of the equipment, and check for any abnormal phenomena such as vibration and shaking. You can gently place your hand on the bed of the equipment to feel its vibration. For a walking machine, the vibration during no-load operation should be very small. At the same time, check whether the movement speed of each axis is normal, and whether there are any jamming, crawling, or other phenomena during the movement process. -Load running test: If conditions permit, conduct a load running test, gradually increase the cutting amount of the machining, observe the operation of the equipment under different load conditions, and pay attention to whether the equipment has overload alarms, significant accuracy decreases, or abnormal vibrations. This can help determine whether the maximum load capacity of the device meets the actual production needs. Temperature stability test: -Thermal deformation detection: After the equipment has been running for a period of time, use a laser interferometer or other thermal deformation measurement equipment to detect the thermal deformation of key components of the machine tool such as the spindle and guide rail. Thermal deformation can lead to a decrease in machining accuracy. Generally, it is required that the thermal deformation of key components should be controlled within a small range after stable operation of the equipment, such as the thermal elongation of the spindle should be less than 0.01mm. -Temperature sensor monitoring: Install temperature sensors at key parts of the equipment to monitor temperature changes in real-time during equipment operation. Observe whether the temperature fluctuates within the normal range and whether the temperature difference between different components is too large. Excessive temperature difference may lead to uneven distribution of thermal stress in the machine tool, affecting performance stability. Stability assessment of control system: -System function testing: Check whether various functions of the CNC system of the equipment, such as programming function, tool compensation function, automatic tool changing function, etc., are working properly. Operate various function buttons and knobs of the CNC system, check whether they are sensitive and effective, and whether the display of the CNC system is normal. -Program running test: Write some complex machining programs, including multi axis linkage, high-speed cutting and other programs, run these programs on the equipment, observe the operation and machining accuracy of the equipment. Check for program errors, crashes, garbled characters, and other issues, as well as whether the device's response speed and machining accuracy are stable during program operation.

When purchasing a second-hand heart machine, the actual operating condition of the equipment can be judged from the following aspects: 1. Appearance inspection Body integrity: Carefully inspect the body of the walking machine for any obvious collisions, deformations, or cracks. These issues may lead to increased vibration and decreased accuracy of the equipment during operation. For example, if there are cracks in the bed, it may affect its rigidity and thus affect the machining accuracy. Paint and protective layer: Check whether the paint on the equipment has peeled off and whether the protective layer is intact. Paint peeling may be a sign of long-term exposure to harsh environments or corrosion of equipment, which may affect its service life. Meanwhile, damage to the protective layer may expose internal components to the external environment, making them susceptible to damage. Component connection status: Observe whether the connections between each component are tight, and whether there are loose or missing connections such as screws and nuts. For example, if the connection part of the tool system is loose, it will cause displacement of the tool during the machining process, affecting the machining accuracy. 2. Static inspection of key components Spindle system: -Manual rotation inspection: In the event of a power outage, manually rotate the spindle and feel the smoothness of its rotation. If there is a feeling of lagging or uneven resistance, it may indicate that the spindle bearing is damaged or there are foreign objects inside. -Accuracy check: Use a dial gauge to check the radial runout and axial displacement of the spindle. For high-precision walking machines, the radial runout of the spindle should generally be controlled within 0.005-0.01mm, and the axial displacement should be less than 0.005mm. Excessive jumping and movement can lead to substandard accuracy indicators such as roundness and cylindricity of the processed parts. Guide rail system: -Appearance inspection: Check the surface of the guide rail for wear, scratches, or corrosion. Minor scratches may affect the accuracy of the guide rail, while severe wear may cause the slider to move unevenly. -Gap inspection: By manually moving the slider, feel the gap between it and the guide rail. Under normal circumstances, the gap should be small and uniform. Excessive gap can lead to a decrease in machining accuracy, especially when performing high-precision machining. Knife tower and tool system: -Tool position accuracy check: Check the tool position accuracy of the turret by installing standard tools and measuring the tool position accuracy using a dial gauge. The precision error of the tool position should be controlled within a small range, such as ± 0.01mm, otherwise it will affect the dimensional and shape accuracy of the parts. -Tool clamping force inspection: Check whether the clamping device of the tool can firmly clamp the tool. It is possible to determine whether the clamping force is sufficient by manually attempting to pull out the tool. If the clamping force is insufficient, the tool may loosen during the machining process, causing parts to be scrapped or even safety accidents. 3. No load operation test Observation of startup process: Turn on the device and listen carefully to the sound of components such as the motor and oil pump during startup. Under normal circumstances, the startup sound should be smooth without any abnormal noise or friction. If you hear a harsh sound or have difficulty starting the motor, it may indicate a problem with the motor or related transmission components. Stability check of no-load operation: Let the equipment run without load for a period of time and observe the overall operation of the equipment. Check for any abnormal phenomena such as vibration and shaking. You can gently place your hand on the bed of the equipment and feel its vibration. For a walking machine, the vibration during no-load operation should be very small, otherwise it will affect the machining accuracy during the machining process. Inspection of each axis motion: Control each axis (such as X, Y, Z axis, etc.) through a numerical control system for individual and coordinated motion, check whether the motion speed of each axis is normal, and whether there are any jamming, crawling, or other phenomena during the motion process. The motion speed of each axis should comply with the nominal parameters of the equipment, and the motion process should be smooth and steady. 4. Load running test (if conditions permit) Trial machining testing: Select appropriate materials and simple machining processes for trial machining, such as machining a small shaft component. During the trial machining process, observe the machining status of the equipment, including whether the cutting sound is normal and whether the chip discharge is smooth. At the same time, check the accuracy of the processed parts, such as dimensional accuracy, shape accuracy, and surface roughness, to ensure that they meet the requirements. Load capacity assessment: Gradually increase the cutting amount of the machining and observe the operation of the equipment under different load conditions. Pay attention to whether the equipment has overload alarm, significant decrease in accuracy, or abnormal vibration. This can help determine whether the maximum load capacity of the device meets the actual production needs. 5. Electrical and cooling system inspection Electrical system inspection: -* * Functional testing * *: Check whether various electrical functions of the device, such as lighting, emergency stop buttons, limit switches, etc., are working properly. Operate various function buttons and knobs of the CNC system, check whether they are sensitive and effective, and whether the display of the CNC system is normal. -Line inspection: Check whether the lines inside the electrical control cabinet are neat and orderly, and whether the wires are damaged, aged, or not. A good electrical system is the guarantee for the normal operation of equipment, and circuit problems may cause equipment failures. Cooling system inspection: Check whether the water tank of the cooling system is clean, whether the coolant is sufficient, and whether the cooling pump can work normally. The cooling system is very important for the heat dissipation of the walking machine during the machining process, especially during long-term machining or high-speed cutting. Insufficient cooling may lead to increased tool wear, decreased equipment accuracy, and other problems.

The price of second-hand Mazak CNC lathes ranges from 6600 yuan to 500000 yuan. Here are some models and price references: 1、 Low end price range QT-350L CNC inclined body lathe: priced at around 8800 yuan, with slightly inferior condition, it can reach around 6600 yuan when starting from 2 units. QT100L CNC inclined body car: 80% new, priced at around 6600 yuan. NEXUS 150-TL CNC inclined body lathe: 90% new, with a minimum order price of around 8800 yuan for one unit and up to 6600 yuan for two units. 2、 Medium price range ST-28N-ATC turning milling composite inclined rail lathe: The price is about 50000 yuan. SLANT TURN 40N： The price is around 350000 yuan. 4、 High end price range Integrax 70/4000 turning milling composite machining center: a product from 2008, priced at around 99990 yuan. H-500/50N dual worktable horizontal machining center: a product from 1995, priced at around 99999 yuan. 250ML turning and milling composite lathe: priced at around 500000 to 550000 yuan.

When purchasing a second-hand Mazak CNC lathe, the following key details should be noted: 1、 Equipment condition Appearance inspection: Carefully inspect the overall appearance of the lathe, including the bed, protective door, cover and other components, for any bumps, deformations, rust, paint peeling, etc. Special attention should be paid to observing the surfaces of key components such as guide rails and lead screws. If there is obvious wear, scratches, or rust, it may affect the accuracy and performance of the equipment. Accuracy testing: The machining accuracy of Mazak CNC lathes is usually high, with a repeat positioning accuracy of about ± 0.005mm. Sellers are required to provide accuracy testing reports or hire professional institutions for testing. You can try to process some high-precision parts, such as shaft parts, and check whether their roundness, cylindricity, surface roughness, etc. meet the standards. Mechanical component inspection: Check the wear of key mechanical components such as spindle, guide rail, ball screw, tool holder, etc. It can be judged by observing the surface smoothness and scratches of the components, and manually moving the components to feel their smooth movement. For ball screws, it is also necessary to check whether their axial clearance is within a reasonable range. Simultaneously check the accuracy and reliability of clamping components such as chucks and tips to ensure stable clamping of workpieces. Electrical system inspection: Check whether the wiring inside the electrical cabinet is neat and standardized, whether there is aging, damage, etc., whether the identification of each electrical component is clear, and whether it is working properly. Test the various electrical functions of the machine tool, such as start, stop, speed regulation, tool change, etc., to ensure sensitivity and effectiveness. Also, check whether the operation panel buttons and knobs of the CNC system are normal, and whether the display screen is clear and undamaged. 2、 Equipment History Service life and frequency: Understand the service life and frequency of lathes. Generally, equipment with shorter service life and lower frequency has better performance and accuracy. If properly maintained, the Mazak CNC lathe can still maintain good performance after about 10 years of use, but excessive frequency of use may lead to increased wear of key components. Maintenance records: The seller is required to provide maintenance records of the equipment, including regular maintenance time, content, and information on the main components replaced. Good maintenance can extend the service life of equipment. If the equipment lacks regular maintenance, various potential faults may be hidden. 3、 Transaction protection Choose reliable sellers: Priority should be given to second-hand equipment dealers or legitimate enterprise sellers with good reputation and high credibility for transactions. You can learn about the seller's reputation by reviewing their reviews, consulting industry professionals, and examining their business license and qualifications. If it is an individual seller, try to obtain as much information as possible about their identity and device source. Sign detailed contract: Before signing the purchase contract, it is necessary to carefully read the contract terms to ensure that the contract content covers all aspects of the transaction in detail, accurately, and completely, including basic information such as equipment model, specifications, quantity, price, delivery time, location, payment method, as well as important clauses such as equipment quality assurance, after-sales service, and breach of contract liability. 4、 Equipment matching Tools and accessories: Inquire with the seller if the original machine comes with tools, fixtures, measuring tools, and other accessories. The completeness and applicability of these accessories can bring convenience to subsequent use and production, while also reducing additional procurement costs. Technical documentation: Ensure that the seller provides complete technical documentation for the equipment, such as operation manuals, programming manuals, maintenance manuals, electrical schematics, etc. These materials are crucial for the operation, maintenance, and repair of the equipment. 5、 After sales service Installation and debugging: Confirm whether the seller can provide installation and debugging services for the equipment to ensure that it can operate normally after installation and meet the expected accuracy and performance requirements. Training support: Understand whether the seller can provide technical training for operators to familiarize them with the operating methods, programming skills, daily maintenance, and other knowledge of Mazak CNC lathes, ensuring that they can use the equipment correctly and safely. Maintenance Guarantee: Inquire with the seller whether they provide after-sales service, such as warranty period, repair response time, etc., as well as whether they can provide long-term maintenance services and technical support, including equipment troubleshooting, parts replacement, etc.

When purchasing a second-hand CNC lathe, the following precautions should be taken: 1. Equipment performance inspection Accuracy testing -Geometric accuracy: This is the most basic accuracy indicator for CNC lathes, including the spindle rotation accuracy (such as radial runout and axial displacement), guide rail straightness, bed flatness, etc. For example, the radial runout of the spindle directly affects the roundness of the machined part, and it is generally required that the radial runout of the spindle of a regular CNC lathe be within 0.01-0.02mm. Measurement can be carried out using tools such as a dial gauge. The dial gauge is fixed on the bed, and the head contacts the surface of the spindle or guide rail. The spindle can be rotated or the slide box can be moved to detect jumping or straightness. -Positioning accuracy and repeat positioning accuracy: Positioning accuracy refers to the degree to which the actual position of the moving parts of the lathe (such as the tool holder) is close to the commanded position, while repeat positioning accuracy reflects the dispersion of positions when positioning multiple times under the same conditions. For precision machining, the positioning accuracy should reach ± 0.01- ± 0.03mm, and the repeated positioning accuracy should be around ± 0.005- ± 0.01mm. It can be measured using professional equipment such as laser interferometers, or simple testing can be performed using the diagnostic function of CNC systems. Processing capability test -Cutting performance: Check the cutting performance of the lathe through trial cutting, observe whether the cutting process is smooth, whether there is vibration, excessive noise, etc. Choose appropriate cutting tools and workpiece materials for trial cutting, such as using hard alloy cutting tools to cut 45 steel, setting reasonable cutting parameters (speed, feed rate, cutting depth). Under normal circumstances, cutting should be smooth, and the surface roughness can meet the expected requirements (for example, the surface roughness Ra of ordinary turning machining can reach 1.6-3.2 μ m). -Maximum machining size and weight: Confirm whether the maximum machining diameter, length, and maximum load-bearing capacity of the lathe meet your machining needs. Check the specifications of the equipment and make judgments based on the actual processed workpiece to avoid purchasing parts that cannot be processed with the required size and weight. System function check -Control system integrity: Check whether the various functional modules of the CNC system are complete, such as programming function, automatic machining function, tool compensation function, etc. For example, for the processing of complex parts, a CNC system with rich programming instructions (such as arc interpolation, thread cutting, etc.) is required. At the same time, check whether the buttons, knobs, etc. on the system's operation panel are working properly, and whether the display screen is clear and undamaged. -Communication interface testing: If data transmission with external devices (such as computer-aided manufacturing software CAM) is required, the communication interface (such as RS-232, USB, etc.) should be tested for normal operation. Attempt to transmit a simple machining program and see if it can be received and executed smoothly. 2. Equipment quality assessment Appearance inspection -Body condition: Check whether there are obvious signs of damage such as collision, deformation, cracks, etc. on the lathe body. The integrity of the machine body is crucial for maintaining the stability and accuracy of the lathe. For example, if there are cracks in the bed, it may cause deformation of the bed during the machining process, thereby affecting the machining accuracy. -Paint and protective layer: Check if the paint has peeled off and if the protective layer is intact. Paint peeling may be a sign of long-term exposure to harsh environments or corrosion of equipment, which may affect its service life. Component inspection -Wear of key components: Focus on inspecting the wear of key components such as the spindle, guide rail, ball screw, and tool holder. For example, wear and tear on the guide rail can cause uneven movement of the slide box, affecting machining accuracy. The degree of wear can be determined by observing the smoothness of the surface of the component, whether there are scratches, and manually moving the component to feel the smoothness of its movement. For ball screws, it is also possible to check if their axial clearance is within a reasonable range. -Electrical and hydraulic systems: Check the wiring of the electrical system for neatness, damage, aging, and other conditions. Check whether the identification of electrical components (such as contactors, relays, motors, etc.) is clear and whether they are working properly. For hydraulic systems, check the oil level in the tank, the working condition of the oil pump, and whether there are leaks in the oil pipes. The stability of the pressure in the hydraulic system is crucial for some lathes equipped with hydraulic chucks, tailstock, and other devices. 3. Equipment history investigation Service life and frequency -Determination of service life: Understand the service life of the lathe. Generally speaking, equipment with a shorter service life has better performance and accuracy. But this is not absolute, it still needs to be judged based on the maintenance and upkeep of the equipment. Usually, the economic service life of CNC lathes is around 10-15 years. Beyond this age, the maintenance cost of the equipment may increase and the performance may gradually decline. -Frequency assessment: Inquire about the frequency of equipment usage, such as the number of processing hours per year. If the device is used too frequently, it may lead to increased wear and tear on critical components. For lathes that are frequently used, it is necessary to carefully inspect the wear of their key components. Maintenance and upkeep records -Maintenance content viewing: The seller is required to provide maintenance records of the equipment, including the time and content of regular maintenance (such as replacing lubricating oil, cleaning filters, calibrating accuracy, etc.), as well as information on the main components replaced. Good maintenance can extend the service life of equipment and improve its reliability. If the equipment lacks regular maintenance, it may hide various potential faults. -Maintenance history understanding: Inquire whether the equipment has experienced major malfunctions, such as spindle failures, CNC system failures, etc. Understand the cause of the malfunction, repair time, and the recovery situation after repair. If the equipment has frequent maintenance records, especially those involving critical components, it may affect the performance and stability of the equipment. 4. Price and after-sales service Price evaluation -Market research: Conduct price research on CNC lathes of the same brand, model, and similar condition in the market before purchasing. Price information can be obtained through second-hand equipment trading platforms, industry forums, and contacting distributors. Consider factors such as device performance, service life, and configuration to evaluate whether the price quoted by the seller is reasonable. To avoid losses due to excessively high prices, while also being alert to potential issues with low-priced equipment. -Cost effectiveness analysis: In addition to price factors, it is also necessary to comprehensively consider factors such as equipment performance, quality, service life, and maintenance to evaluate its cost-effectiveness. Don't choose devices with poor performance or potential problems just because they are cheap, and don't blindly pursue high-end brands and high performance while ignoring price factors. after-sale service -Warranty commitment: Understand whether the seller provides after-sales service, such as the warranty period, scope, and repair response time of the equipment. For second-hand equipment, some sellers may provide a certain period of warranty service, which can provide buyers with certain protection. For example, some sellers may offer a warranty period of 3-6 months, during which they will provide free repair or replacement for non-human faults in the mechanical components or CNC system of the equipment. -Technical support: Inquire with the seller if they can provide technical support, including equipment operation training, troubleshooting guidance, etc. For users who are not familiar with the operation of CNC lathes, operation training is very important as it can help them quickly get started and use the equipment correctly. At the same time, timely guidance on troubleshooting can be obtained when equipment malfunctions, which can reduce downtime.

The price of second-hand CNC lathes varies greatly due to factors such as brand, model, year, configuration, accuracy, and usage status. The following are some common price ranges for second-hand CNC lathes of different brands and models for your reference: 1、 Domestic brands: Shenyang Machine Tool: -CAK4085n CNC horizontal lathe: The price is around 20000 to 30000 yuan -HTC3650 CNC lathe: Depending on different configurations and service life, the price ranges from 30000 to 50000 yuan Yunnan Machine Tool: -CK NC-40T CNC horizontal lathe, with a relatively affordable price, usually around 15000-30000 yuan Spark Machine Tool: -CK61100 CNC horizontal lathe: usually between 50000 and 80000 yuan -CK61125x10 meter CNC horizontal lathe: Due to its long processing length, the price is around 80000 to 120000 yuan Plison Machine Tool: -CKS61100Dx1.5m CNC horizontal lathe: The price is around 60000 to 90000 yuan -C61160Gx12m CNC horizontal lathe: 90% new price starts at about 6600 yuan/unit, and bulk purchase price can be as low as 6600 yuan/unit 2、 Taiwanese brands: -Taiwan oil engine: KVL-1200ATC CNC vertical lathe, the price is generally around 80000 to 150000 yuan -Taiwan Chengtai: Quasi new CNC lathes, usually priced between 100000 and 200000 yuan -Taiwan Qiaofu: GT-120D high-precision sloping car, priced at around 30000 to 50000 yuan 3、 Japanese brands: -Okuma, Japan: LB4000EXII-R used CNC milling and turning equipment, price negotiable, but generally the second-hand price of this high-end milling and turning equipment is over 200000 yuan -Imported O-M Itd CNC vertical lathe from Japan: The price needs to be negotiated, usually around 150000 to 300000 yuan 4、 German brand: -DMG: CTX310 eco milling composite, price negotiable, generally around 200000 to 300000 yuan -GROB five axis machine tool, price negotiable, second-hand price usually above 300000 yuan -Equal weight: -C5225Ex16-10 CNC vertical lathe: Price negotiable, generally around 100000-150000 yuan -DVT350x25-32 CNC vertical lathe: main motor power of 55, price negotiable, approximately 80000 to 120000 yuan

Choosing a suitable high-speed punching machine requires comprehensive consideration of the following aspects: 1、 Processing requirements Stamping part types: Different types of stamping parts have different requirements for the punching machine. For example, for small and medium-sized metal material punching parts, bending parts, or shallow drawing parts, an open punch press is more suitable. Its body opens on three sides, making it easy to operate and assemble molds, feeding machines, and automatic mold changing equipment to achieve intelligent production. It is also affordable; For large, medium, small or high-precision stamping products, it is advisable to use door type high-speed punching machines and two axis high-speed punching machines; For stamping processes such as straightening, calibration bending, and plastic surgery, high-speed punching machines with high strength and rigidity should be selected Precision requirements: If stamping parts require extremely high precision, such as precision components in industries such as electronics and automobiles, it is necessary to choose high-speed punching machines with high processing precision. The flatness of the worktable, the accuracy of the slider movement, and the parallelism of the upper and lower die seats should all reach a high level to ensure the dimensional and shape accuracy of the stamping parts Production batch size: The size of the production batch is also an important factor in choosing high-speed punching machines. If it is large-scale production, high-speed punching machines with high production efficiency and automation should be selected, such as punching machines equipped with automatic feeding devices and rapid mold changing systems, to improve production efficiency and reduce production costs; For small-scale production, relatively flexible and low-priced punching machines can be selected according to specific situations 2、 Equipment performance Tonnage: The tonnage of the selected high-speed punch must exceed the stamping pressure during actual stamping production, and the product load curve should be ensured to not exceed the allowable load curve of the high-speed punch as much as possible. When punching and calibrating bending parts, the maximum punching force should be less than 80% -90% of the tonnage; When deep drawing, the maximum drawing force shall not exceed 50% -60% of the tonnage; When shallow drawing, the maximum drawing force shall not exceed 70% -80% of the tonnage Travel and speed: The travel and speed should be determined according to the specific stamping process. When manually feeding materials, it is not advisable to use high-speed punching machines with too many strokes; When automatic stamping, it is advisable to choose high-speed punching machines with more strokes. When deep drawing, high-speed punching machines with too many strokes should not be used because the drawing is too fast and the material is not fully deformed in time, making the parts prone to cracking Mold height: The mold height of the punch press should match the height of the mold used, that is, the closing height of the mold should be between the maximum and minimum mold heights of the punch press. In addition, considering factors such as the shortening of the crankshaft after wear and the possibility of reducing the closing height of the mold during future mold repairs, the height of the stamping mold is generally taken to be close to the maximum mold mounting height of the punch press when designing the mold Workbench size: The workbench size needs to be determined based on the actual size of the installed mold. If the mold is large, the equipment workbench size can be increased according to the requirements 3、 Equipment quality and stability Brand and reputation: High speed punching machines from well-known brands are usually more guaranteed in terms of quality, performance, and after-sales service. You can learn about the reputation and market recognition of different brands by consulting industry information, consulting peers, and viewing user reviews, and choose brands with good reputations Manufacturing process: High quality high-speed punching machines adopt advanced manufacturing technology and high-precision processing equipment, which can ensure the accuracy and stability of the equipment. For example, the bed body is welded with high-strength cast iron or steel plate, and undergoes aging treatment to eliminate internal stress, which can effectively prevent deformation; Key components such as crankshafts, gears, connecting rods, etc. have undergone precision machining and heat treatment, resulting in high hardness and wear resistance Control system: Advanced control systems can achieve precise control of punch presses, improving machining accuracy and production efficiency. For example, numerical control systems have the advantages of simple programming, convenient operation, and high degree of automation, and can achieve complex functions such as multi coordinate linkage and high-speed high-precision machining 4、 Security Safety protection device: High speed punching machines should be equipped with comprehensive safety protection devices, such as photoelectric protection devices, manual operation buttons, safety light curtains, emergency stop buttons, etc., to prevent operators from being injured during operation Compliance with safety standards: Ensure that the selected high-speed punching machines comply with relevant national and industry safety standards, such as mechanical safety, electrical safety, noise control, etc., to ensure the safe and reliable operation of the equipment.