來源：http://www.railway-signal.com/ 發布時間：2021-09-03 瀏覽次數：
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.
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. 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. 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.
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.