The NC cutting function in the application branch of NC automatic machine tool meets the blanking processing of a large number of domestic production-oriented enterprises. In terms of the working principle of the machine tool, the NC cutting machine still follows the main three-axis transmission design in the market, and achieves the purpose of fine cutting and blanking through plane coordinate positioning.

數控切割機的機械部分維護工作中，主軸與滑動軸作為傳動部分主要組成部分，其維護處理相對較多。兩軸的損耗及故障多集中在日常維護工作不到位導致，另外對于數控切割機的使用環境這里也需要有一定的要求，對于廠房內金屬粉塵或殘渣較多也可能導致部件損傷。這里就一些簡單的故障處理方法整理說明如下：

In the maintenance of the mechanical part of NC cutting machine, the main shaft and sliding shaft are the main components of the transmission part, and there are relatively many maintenance treatments. The loss and faults of the two shafts are mostly caused by the inadequate daily maintenance. In addition, there are certain requirements for the use environment of the NC cutting machine. More metal dust or residues in the plant may also lead to component damage. Here are some simple troubleshooting methods:

1、滑動軸承表面被研傷后，維護方案應是刮石匠方法維護。一般來說，滑動軸承都留有可供調整和修理的余量，可以滿足數控切割機的一個修理周期。如果研傷十分嚴重，修理余量不能滿足，就需要考慮更換了。兩半瓦式滑動軸承研傷后，可以減薄墊片重新組裝后，刮研軸瓦內孔要求精度，維護后繼續使用。

1. After the sliding bearing surface is abraded, the maintenance scheme shall be maintained by the stone scraper method. Generally speaking, the sliding bearing has a margin for adjustment and repair, which can meet a repair cycle of NC cutting machine. If the grinding damage is very serious and the repair allowance cannot be met, replacement needs to be considered. After the two half pad sliding bearing is abraded, it can be thinned. After reassembly, scrape and grind the inner hole of the bearing bush to the required accuracy, and continue to use after maintenance.

2、當軸頸有研傷后，可采用磨小軸頸、更換滑動軸承的方法。但軸頸修磨不宜太大，比如機床主軸，修磨量不宜超過軸頸表面淬火，或者滲碳、氮化、氰化的厚度、修磨后軸頸表面硬度不得低于原設計硬度的下限；對于傳動軸來說，軸頸不應小于裝配時在裝配方向前端軸頸或凸臺的尺寸。

2. When the journal is abraded, the method of grinding the journal and replacing the sliding bearing can be used. However, the journal grinding should not be too large. For example, for the machine tool spindle, the grinding amount should not exceed the journal surface quenching, or the thickness of carburizing, nitriding and cyanidation, and the surface hardness of the journal after grinding shall not be lower than the lower limit of the original design hardness; For the drive shaft, the journal shall not be less than the size of the front journal or boss in the assembly direction at the time of assembly.

如果用焊補的方法來維護數控切割機軸頸，那么要考慮焊補加熱過程對軸的幾何精度、機械強度及表面硬度的影響。軸頸維護后，一般都需要按軸頸重新配做滑動軸承（或稱軸套）。

If the welding repair method is used to maintain the Journal of NC cutting machine, the influence of welding repair heating process on the geometric accuracy, mechanical strength and surface hardness of the shaft should be considered. After journal maintenance, sliding bearings (or shaft sleeves) generally need to be reconfigured according to journal.