How to improve CNC machining accuracy?

We all know that one of the indicators to test nc machining is machining accuracy. How to ensure CNC machining accuracy when we produce in batches? The traditional scheme is the trial cutting method, which is by trial cutting - measuring the size - adjusting the amount of cutting tool - cutting - trial cutting, and so on until the desired size. This method can ensure the error in a reasonable range of control, but more cumbersome, production efficiency is not high, mainly used for single small batch production. The mass production of mobile phone shell, while maintaining high CNC processing accuracy, it is necessary to adjust the relative position of the machine tool, fixture, workpiece and tool to obtain the required size to ensure the purpose of batch processing accuracy. So in order to ensure the accuracy of the processing to adjust the process in advance?

1. Improve the rotary accuracy of the bearings of CNC machine tools. In order to improve the accuracy of the wheel, you can choose high-precision rolling bearings, multi-oil cheese dynamic pressure bearings, hydrostatic bearings. At the same time, improve the accuracy of bearing accessories, such as improving the box support hole, spindle journal processing accuracy, so that the spindle rotation accuracy is not reflected to the workpiece.

2. Control the thermal deformation of the process. CNC machining center is a high speed cutting processing equipment, the processing process will produce a lot of heat, should reduce the heat source of heat and isolation of heat source, increase the heat treatment process to eliminate internal stress; The size of the machining error reflects the height of the machining accuracy. The larger the error, the lower the machining accuracy, and the smaller the error, the higher the machining accuracy.

3. reduce the transmission chain transmission error transmission system should keep the number of transmission less, transmission chain is short, the principle of high transmission accuracy, using speed reduction transmission is an important way to ensure transmission accuracy, and the closer to the end of the transmission pair, the transmission ratio should be smaller; The accuracy of the end parts should be higher than other transmission parts.

4. reduce the wear of CNC machine tools. Before the tool sharp wear, should re-wear the tool, choose the most dedicated cutting oil for full lubrication, the tool material should meet the process requirements.