How to pick the right used coordinate grinder?
Selection of suitable used coordinate grinding machine, need to start from the following aspects:
First, clear their own needs
Processing accuracy requirements: according to the precision level of the parts to be processed, select the appropriate accuracy of the coordinate grinder. For example, if the processing of precision molds, you need to choose a high-precision second-hand coordinate grinder, the machining accuracy can be controlled at the micron level, such as ± 0.001mm - ± 0.005mm between, in order to ensure that the mold dimensional accuracy and surface quality.
Processing size range: Measure the maximum size of the parts to be processed to ensure that the table size and stroke range of the used coordinate grinder can meet the processing requirements. Such as the processing of large automotive parts, you need to choose a larger table size, longer stroke of the coordinate grinding machine, table size is generally in the 600mm × 400mm or more, x / y / z-axis stroke in the 500mm × 300mm × 200mm or more.
Production volume: If for mass production, should choose a high degree of automation, high productivity of the second-hand coordinate grinder, such as with automatic tool changer, automatic measurement system of CNC coordinate grinder, in order to improve production efficiency and product consistency; if for small batch production or single processing, the degree of automation requirements are relatively low, you can focus on the basic performance of the grinder and accuracy.
Second, assess the condition of the equipment
(a) Appearance inspection: check the overall appearance of the equipment, check whether there are obvious signs of damage such as collision, deformation, rust and corrosion. Whether the paint on the surface of the equipment is intact, if there is a large area of peeling, may suggest that the equipment has been in a poor working environment or a long service life.
(ii) Key components inspection:
Spindle: The spindle is the core component of the coordinate grinder, check its rotational accuracy, axial runout and radial runout. Measured with a percentage table and other professional tools, the general requirements of the spindle radial runout does not exceed 0.002mm - 0.005mm, axial runout does not exceed 0.001mm - 0.003mm. At the same time, check the spindle wear, such as spindle taper hole wear, journal wear, etc., if the wear is serious, it will affect the machining accuracy and stability.
Guideway: Check the straightness, flatness and wear of the table guideway, grinding wheel holder guideway, etc.. The straightness of the guideway is generally required within 0.005mm/1000mm, flatness within 0.01mm/1000mm. If the guide rail wear is not uniform or obvious scratches, pits, will lead to uneven movement of the table, affecting the machining accuracy.
Screw: Check the transmission accuracy, backlash and wear of the screw. Rotate the screw handwheel, feel whether the rotation of the screw is smooth, there is no stagnation phenomenon; with a percentage meter to measure the backlash of the screw, the general requirements of the backlash does not exceed 0.01mm - 0.02mm. If the screw is seriously worn, it will lead to a decline in the positioning accuracy of the worktable.
(C) precision testing: if available, you can use professional testing tools to test the geometric accuracy and positioning accuracy of the coordinate grinding machine, such as laser interferometer, ballbar and so on. Testing items include the flatness, straightness and perpendicularity of the table, positioning accuracy of the coordinate axes, repeat positioning accuracy, etc., to ensure that the accuracy indexes meet the processing requirements, the general positioning accuracy should be within ± 0.005mm, repeat positioning accuracy within ± 0.002mm.
(d) Wear degree assessment: by checking the use of equipment time, the number and types of workpieces processed, etc., to understand the degree of wear and tear of the equipment. Generally speaking, the use of a shorter period of time, the number of workpieces processed by a small number of second-hand coordinate grinding machine, the degree of wear is relatively light.
Third, understand the history of the equipment
Use records: Ask the seller about the use of the equipment, including the use of the industry, the type of workpiece processing, the average daily working time, etc., to understand the intensity of use of the equipment and the working environment.
Maintenance records: check the maintenance records of the equipment, to understand whether the regular maintenance, replacement of wearing parts. If the equipment has a complete maintenance record, and maintenance work done well, its performance and accuracy is relatively more secure.
Maintenance history: to understand whether the equipment has been a major failure, overhaul, etc.. If the equipment has been repaired or overhauled several times, you need to further understand the specific parts of the maintenance and the reasons, to assess the impact on the performance and accuracy of the equipment.
Fourth, examine the performance of the equipment
Control system: Check the control system of the coordinate grinding machine, to understand whether the operation interface is friendly, whether the function is complete, whether it has online measurement, error compensation and other functions. Currently on the market common numerical control system Siemens, Fanuc, etc., different numerical control system in the stability, precision control, programming convenience and other aspects of the difference.
Grinding performance: focus on the grinding wheel speed range, grinding force, grinding efficiency and other indicators. The speed of the grinding wheel is generally between 10000rpm - 30000rpm, the higher the speed, the higher the grinding efficiency, but the higher the quality of the grinding wheel and balance requirements. At the same time, check the stability of the grinding process, whether there is vibration, noise and other abnormal phenomena.
Degree of automation: According to the production demand, choose the used coordinate grinder with suitable degree of automation. High degree of automation grinding machine can reduce manual intervention, improve productivity and processing accuracy, but the price is relatively high. Such as automatic loading and unloading device, automatic measurement and compensation system and other functions, can be selected according to the actual situation.
Fifth, consider the after-sales protection
Technical support: ask the seller or the original manufacturer to provide technical support, including equipment installation and commissioning, operation training, troubleshooting and other services. If there are problems with the equipment, can get professional technical support in a timely manner, to ensure the normal operation of the equipment is critical.
Spare parts supply: to understand the supply of spare parts for used coordinate grinding machines, to ensure that when the equipment needs to be repaired, you can purchase the required spare parts in a timely manner. Some imported brands of used equipment may have a longer supply cycle or higher prices for spare parts, so you need to consider this factor in advance.
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