The thermal characteristics of CNC machine tools have an important impact on the CNC machining accuracy, accounting for almost half of the machining accuracy; the machine tool spindle, the guide rails, lead screws and other components used in the XYZ motion axis will heat and deform due to load and friction during movement, but thermal deformation In the error chain, what ultimately affects the machining accuracy is the displacement of the spindle and the XYZ motion axis components relative to the worktable.
The machining accuracy of the machine tool in the long-term shutdown state and the thermal equilibrium state is quite different; the reason is that the temperature of the CNC machine tool spindle and each moving axis is relatively maintained at a certain fixed level after running for a period of time. With the change of processing time, the thermal accuracy of CNC machine tools tends to be stable, which shows that it is very necessary to preheat the spindle and moving parts before processing.
If the machine is idle for more than a few days, it is recommended to preheat for more than 30 minutes before high-precision machining: if the machine is only left for a few hours, it is recommended to preheat for 5-10 minutes before high-precision machining.
The warm-up process involves the machine tool participating in the repetitive motion of the machining axes. It is best to carry out multi-axis linkage, such as moving the XYZ axis from the lower left corner of the coordinate system to the upper right corner, and repeating the diagonal line.
When executing, you can write a macro program on the machine tool to let the machine tool perform the preheating action repeatedly.
After the large cnc machining machine is fully preheated, the energetic machine tool can be put into high-precision machining production, and you will obtain stable and consistent machining accuracy.
