How to check the stability reliability of large CNC machine tools?

The detection method of the precision of CNC machine tools is similar to that of ordinary machine tools, and the detection demand is higher than that of ordinary machine tools. Precautions for testing: When testing, the base of the machine tool should be completely cured. The errors of detection tools and methods should be minimized during detection. Should be in accordance with the relevant national norms, first turn on the machine power to preheat the machine, and let the machine along the axis of the reciprocating activity several times, so that the spindle at a moderate speed for a few minutes after the hold. The precision of CNC machine tools is usually higher than that of ordinary machine tools. Usually, the tools and measuring tools used in machine tools are often unable to meet the testing needs because of their low accuracy. And the accuracy level of the detection tool used is one level higher than the accuracy of the measured number. Hongcan, a large CNC machining center in Guangzhou, believes that the accuracy must be completed in sequence after the fine debugging of the machine tool, and it must not be adjusted to measure one item, because some of the accuracy is connected and affected by each other. Load experiments should also be carried out on giant CNC machine tools to check whether the machine can reach the depicted bearing capacity; Whether the organizations can operate normally under the load condition; The operation stability and reliability of the machine tool can pass. In addition, before and after the load test, the accuracy of the machine tool should be checked. The test of operation accuracy should be completed after the load test.

In today's CNC lathe, thread cutting usually has three processing methods: G32 direct cutting method, G92 direct cutting method and G76 oblique cutting method, because the cutting method is not the same, the programming method is not the same, the formation of processing errors are not the same. We should carefully analyze the operation and application, and compete for parts with high precision. G32 direct cutting method, because the two edges work together, the cutting force is large, and the row cutting is difficult, so when cutting, the two cutting edges are simple wear. When cutting the thread with larger pitch, because the cutting depth is larger, the blade wear is faster, and then the middle diameter of the thread is wrong; However, its machining precision is higher, so it is usually used for small pitch thread processing. Because the tool moving cutting is completed by programming, so the processing program is longer; Because the blade is simply worn, it is necessary to measure frequently during processing.

2, G92 direct cutting method simplifies the programming, compared with G32 order to improve the power.

3, G76 oblique cutting method, because of single-edge machining, machining blade simple damage and wear, so that the processing of the thread surface is not straight, the knife Angle changes, and the formation of teeth accuracy is poor. However, because it is single-edge work, the tool load is small, chip removal is simple, and the cutting depth is decreasing. Therefore, this processing method is usually suitable for large pitch thread processing. Because this processing method is simple to remove chips, the blade processing condition is better, and the processing method is more convenient when the thread accuracy is not high. In the processing of more high-precision threads, you can choose to finish the two-tool processing, both with the G76 processing method to hold a rough turning, and then with the G32 processing method. However, we should pay attention to the starting point of the tool, otherwise it is simple and disorderly, forming parts and materials.

4, thread processing can be completed through the investigation of thread type to determine the quality of thread instant selection method, when the top of the thread is not pointed, the cut amount of the added knife will increase the large diameter of the thread, increase a lot depending on the material plasticity, when the top of the tooth has been sharpened, the cut amount of the added knife is reduced, according to this feature to correctly look at the cut amount of the thread, to avoid reporting materials.