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How to monitor the CNC machining process?
2020-08-21

CNC machining is controlled by a computer after programming. Therefore, CNC machining has the advantages of stable machining quality, high machining accuracy, high repeatability, can process complex profiles, and high machining efficiency. CNC machining has become the mainstream processing equipment in the processing field. . In the actual processing process, human factors and operating experience will affect the processing quality of the workpiece to a large extent.

As we all know, the workpiece can enter the automatic processing stage after the alignment and program debugging are completed. However, in the automatic processing of CNC machine tools, the operator needs to monitor the cutting process to prevent abnormal cutting from causing workpiece quality problems and other accidents.

During the machining process, it is important to monitor several aspects of the CNC machining process.


Monitoring on rough machining

The main consideration of the machining process monitoring rough machining is the rapid removal of the excess margin on the surface of the workpiece. In the automatic machining process of the machine tool, according to the set cutting amount, the tool automatically cuts according to the predetermined cutting path. At this time, the operator should pay attention to observe the cutting load changes in the automatic machining process through the cutting load table, adjust the cutting amount according to the bearing capacity of the tool, and give play to the efficiency of the machine tool.

Monitoring on cutting sound

Monitoring on cutting sound during cutting in the automatic cutting process, generally when cutting is started, the sound of the tool cutting the workpiece is stable, continuous, and brisk. At this time, the movement of the machine tool is stable. As the cutting process progresses, when there are hard spots on the workpiece, tool wear, or tool clamping, the cutting process becomes unstable. The unstable performance is that the cutting sound changes and the tool and the workpiece collide with each other. Sound, the machine tool will vibrate. At this time, the cutting amount 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 workpiece

Finishing monitoring

The finishing process monitoring finishing is mainly to ensure the processing size and surface quality of the workpiece, the cutting speed is high, and the feed rate is large. At this time, attention should be paid to the impact of built-up edge on the machined surface. For cavity machining, attention should be paid to overcutting and cutting at corners. To solve the above problems, one is to pay attention to adjusting the spray position of the cutting fluid so that the machined surface is always in a cooling condition; the other is to pay attention to the quality of the machined surface of the workpiece, and adjust the cutting amount to avoid quality changes as much as possible. If the adjustment still has no obvious effect, the machine should be shut down to check whether the original program is reasonable. Special attention should be paid to the position of the tool when the inspection is suspended or stopped. If the tool stops during the cutting process, a sudden spindle stop will cause tool marks on the surface of the workpiece. Generally, consider stopping the tool when it leaves the cutting state.

Monitoring on tool

The quality of the tool largely determines the processing quality of the workpiece. In the automatic machining and cutting process, it is necessary to judge the normal wear condition and abnormal damage condition of the tool through methods such as sound monitoring, cutting time control, pause inspection during cutting, and workpiece surface analysis. According to the processing requirements, the cutting tools should be processed in time to prevent the processing quality problems caused by the cutting tools not being processed in time.


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