Is it necessary to warm up the CNC machine every morning when it is turned on?

The factory uses precision CNC machine tools (machining center, EDM, slow wire walking, and other machine tools) for high-precision machining. Do you have such experience:start-upp for processing every morning, the machining accuracy of the first piece is often not good enough; The accuracy of the first parts is often very unstable, and the probability of failure is very high when machining with high precision, especially the position accuracy. machined part

Factories without precision machining experience often blame the quality of the equipment for the unstable precision. Factories with expertise in precision machining will attach great importance to the thermal balance between the ambient temperature and the machine tool. They are clear that even high-precision machine tools can only obtain stable machining accuracy under a stable temperature environment and thermal equilibrium. Preheating the machine tool is the most basic common sense of precision machining when investing in high-precision machining after the machine is turned on.
1. Why should the machine tool be preheated? aluminum CNC machining part
The thermal characteristics of CNC machine tools have an essential impact on machining accuracy, accounting for more than half of the machining accuracy.
The spindle of the machine tool, the guide rails, lead screws, and other components used in the XYZ motion shaft will heat up and deform due to load and friction during movement. Still, the thermal deformation error chain that ultimately affects the machining accuracy is the spindle and the XYZ motion shaft, which is the displacement of the table.
The machining accuracy of the machine tool in the state of long-term stop operation and the state of thermal equilibrium is quite different. The reason is that the temperature of the spindle and each motion axis of the CNC machine tool is relatively maintained at a certain level after running for some time. With the change in processing time, the thermal accuracy of CNC machine tools tends to be stable, indicating that preheating the spindle and moving parts before processing is essential.
However, the “warm-up exercise” of the machine tool is ignored or unknown by many factories.
2. How to preheat the machine tool?
If the machine tool is put on hold for more than a few days, it is recommended to preheat for more than 30 minutes before high-precision machining; if the machine is put on hold for only a few hours, it is recommended to preheat for 5-10 minutes before high-precision machining.
The preheating process lets the machine tool participate in the repeated movement of the machining axis. It is best to perform multi-axis linkage. For example, let the XYZ axis move from the lower left corner of the coordinate system to the upper right corner and repeat the diagonal line. cCNCmachining part
When executing, you can write a macro program on the machine tool to let the machine tool repeatedly perform the preheating action. For example, when the CNC machine tool stops running for a long time or before processing high-precision parts, according to the mathematical 3D ellipse parameter curve and the preheated machine tool space range, t is used as the independent variable, and the coordinates of the three motion axes of XYZ are used as parameters. With a certain incremental step distance, the specified XYZ motion axis’s maximum range is used as the parameter curve’s boundary condition. The spindle speed and the XYZ motion axis feed rate are associated with the independent variable t so that it changes continuously within the specified range, generating The numerical control program that can be recognized by the numerical control machine tool is used to drive the motion axes of the machine tool to create synchronous no-load motion, and is accompanied by the control transformation of the spindle speed and feed rate during the motion.
After the machine is fully warmed up, the dynamic machine can be put into high-precision machining production, and you will get stable and consistent machining accuracy.

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