Numerical control processing, through the CNC numerical control system of digital operation after send control signal to the servo drive, drive servo motor rotation, then through mechanical hand table feed unit, relative movement between the workpiece and cutting tool, at the same time position detection feedback device actual relative movement between the workpiece and cutting tool into electrical signal feedback to the CNC numerical control device, So what are the reasons for the instability of CNC machining dimensions?

                         

　

1. The connection between the servo motor shaft and the lead screw is loose, causing the lead screw and the motor to be out of sync, resulting in size error. When detecting, just make a mark on the coupling of the servo motor and the lead screw, and move the working table (or tool carrier) back and forth with a faster rate. Because of the inertia of the working table (or turret), the two ends of the coupling will appear obvious relative movement. This kind of fault usually shows that the machining size changes in one direction only and can be eliminated by fastening the coupling screw evenly.

2. The poor lubrication between the ball screw and the nut increases the movement resistance of the worktable (or the tool rest), so that the movement instruction cannot be completely and accurately executed. This kind of fault is usually shown as part size in a few wire range of irregular changes, only need to improve the lubrication can eliminate the fault.

3. The movement resistance of machine tool table (or tool rest) is too large, which is generally caused by too tight adjustment of inserts and poor lubrication on the surface of machine guide rail. This fault phenomenon is generally shown as part size in a few wire range of irregular changes. The inspection can be carried out by observing the size and change of the position deviation of DGN800-804. Usually, there is a large difference when the positive and negative directions are stationary. Such faults only need to readjust the inserts and improve the lubrication of the guide rail.

4. Rolling bearing wear or improper adjustment, resulting in excessive movement resistance. This fault phenomenon is also usually shown in the size of a few wire within the range of irregular changes. The inspection can be carried out by the position deviation of DGN800-804, the same method as above. This kind of fault only needs to replace the worn bearing and adjust it carefully, and the fault can be eliminated.

The above is for you to introduce the content of CNC machining, if you want to know more, you are welcome to call for consultation!