How to improve the accuracy of CNC machining center?

As we all know, error is a major index to test the qualified rate of workpiece processing. In CNC machining center, the accuracy is mainly expressed by the error size, the specific accuracy is divided into two kinds, including static accuracy and dynamic accuracy, so how to improve the CNC machining center accuracy?

1, CNC machining center selection. Due to the accuracy of CNC machining center itself is also different, which requires us to pay attention to the choice of CNC machining center model and the choice of precision, the CNC machining center position accuracy test usually adopts the international standard ISO230-2 or national standard GB10931-89. In the choice of CNC machining center also pay attention to the standard, this is due to the difference in the standard will also cause the difference in accuracy.

2. Control of parts. The CNC machining center of sliding bearing can choose the bearing with better wear resistance, so as to ensure the working accuracy of the CNC machining center.

3. Control of workshop environment. Reduce heat source: focus on spindle bearing speed, clearance adjustment and reasonable pretightening. For thrust bearings and tapered roller bearings, because of the difference in their working conditions, the heat is large, when necessary, it can be replaced by thrust angular contact ball bearings to reduce the friction heat of some parts as far as possible. Heat insulation: keep the heat away from the main shaft, such as the motor, transmission isolation, the use of separation transmission, etc. Heat dissipation: strengthen lubrication and cooling, adopt oil cooling, air cooling and other ways to accelerate heat emission. Reduce the impact of thermal deformation: no matter what method is used, only the thermal deformation can be reduced but it is difficult to eliminate the thermal deformation completely. Therefore, measures should be taken to reduce the impact of thermal deformation.

4. Control of reverse deviation. The precision of the equipment due to negative deviation will become low, and with the application of CNC machining center, the longer it is wear and tear, the greater the error will be bigger and bigger, this requires that in the process of the application of CNC machining center for negative deviation detection and compensation work regularly, and as far as possible to reduce the error, improve accuracy of CNC machining center work.

5. Error compensation. Error compensation is on a CNC machining center will be the record of fixed axis position accordingly, in addition, combined with related document data and the actual measurement results are compared, understand error values, and on the axis in operation selected measurement datum, record the error values in operation, and the input to the relevant control system, This allows good control of the axis motion and error time at different points. If the number of measured points is greater, the error effect of pitch compensation will be more obvious. The premise of this error compensation technology is based on the CNC machining center coordinate system, and the important parameter to determine the CNC machining center coordinate system is the reference point. Therefore, it is necessary to ensure that the error value of the selected reference point is zero.

6. reverse clearance error compensation. Due to the influence of reverse clearance error in CNC machining center, it is necessary to pay full attention to reverse clearance error in the design of CNC machining center, and take effective measures to solve it. But what is undeniable is that gap exists, so we have to do is to through the screw pitch error compensation technology of CNC machining center, the reverse clearance for recording at various points in the process of operation and by CNC machining center control system to compensate the error of inverse kinematics direct operation, thus using the parameter setting and set to reduce the error of the system.

7. Improvement of technology. Precision CNC machining center with the development of science and technology is also constantly improve and progress, precision CNC machining center from micron grade again to nanoscale progress, which need more research and development, especially on the bearing technology, avoid the hysteresis of bearing technology is one of the difficulties for the development of, hysteresis effects on the precision of positioning is particularly important, In the study found that the hydrostatic bearing technology can solve the mechanical hysteresis phenomenon, so in the high precision CNC machining center machining has been a large number of applications.

To sum up, in the machining work of CNC machining center, there are many factors affecting the accuracy of CNC machining center. For these influences, we should comprehensively analyze, reduce the error as far as possible from many aspects, and effectively improve the machining accuracy.

Shenzhen Manners Technology Co.,Ltd is the supplier of some of the world’s famous international companies like Blum Novotest, Komet, Geneva Lab, BTL, etc... We specialize in telescoping parts, needle manufacturing, multi-axis CNC machining, Die casting mold, plastic injection mold, stamping mold, Swiss-type turning, laser cut tubing, tube processing, laser welding and automated assemblies for the medical, endoscopic, arthroscopic, orthopedic, firearms, defense, automotive, and specialty industrial markets.

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