How to monitor and adjust in cnc machining process?

How to monitor and adjust in the cnc machining process?

After the workpiece is aligned and the program is debugged, it can enter the automatic machining stage. In the process of automatic machining, the operator should monitor the cutting process to prevent abnormal cutting from causing workpiece quality problems and other accidents.

Monitoring the cutting process mainly considers the following aspects:

1. Monitoring the rough machining of the machining process mainly considers the rapid removal of excess allowance on the surface of the workpiece. In the process of automatic machining of the machine tool, the cutting tool automatically cuts according to the predetermined cutting path according to the set cutting amount. At this time, the operator should pay attention to observe the change of cutting load in the process of automatic machining through the cutting load table, and adjust the cutting amount according to the bearing capacity of the tool to maximize the efficiency of the machine tool.

2. Monitoring of cutting sound during cutting In the automatic cutting process, when cutting is generally started, the sound of the tool cutting the workpiece is stable, continuous and brisk, and the movement of the machine tool is stable at this time. As the cutting process progresses, when there are hard points on the workpiece or tool wear or tool feeding and other reasons, the cutting process is unstable. The unstable performance is that the cutting sound changes, there will be mutual impact between the tool and the workpiece, and the machine will vibrate. At this time, the cutting parameters and cutting conditions should be adjusted in time. When the adjustment effect is not obvious, the machine tool should be suspended to check the condition of the tool and the workpiece.

3. The finishing process monitors the finishing, mainly to ensure the machining size and surface quality of the workpiece, the cutting speed is higher, and the feed is larger. At this time, attention should be paid to the influence of chip accumulation on the processed surface. For cavity processing, attention should also be paid to over-cutting and knife letting at corners. To solve the above problems, one is to pay attention to adjust the spray position of the cutting fluid, so that the machined surface is always in the cooling condition; the second is to pay attention to observe the quality of the machined surface of the workpiece, and to avoid changes in quality as much as possible by adjusting the amount of cutting. If the adjustment still has no obvious effect, it should be stopped to check whether the original procedure is reasonable. Special attention should be paid to the position of the tool when suspending inspection or stopping inspection. If the tool stops during the cutting process, the sudden spindle stop will cause the workpiece surface to produce a knife mark. Generally, shutdown should be considered when the tool leaves the cutting state.

4. Tool monitoring The quality of the tool largely determines the processing quality of the workpiece. In the process of automatic machining and cutting, the normal wear condition and abnormal damage condition of the tool should be judged by means of sound monitoring, cutting time control, suspension inspection during cutting, and surface analysis of the workpiece. According to the processing requirements, the tool should be processed in time to prevent the processing quality problems caused by the tool not being processed in time.