On metal machining, there are many problems, the workpiece can enter the automatic processing stage after finding the correct and the program debugging is completed. In the automatic machining process, the cutting process should be monitored to prevent the abnormal cutting caused by workpiece quality problems and other accidents. Therefore, the following aspects are mainly considered for monitoring the cutting process:

(1) Processing monitoring

The main consideration of roughing is the rapid removal of excess margin on the surface of the workpiece. In the automatic machining process of the machine tool, according to the set cutting parameters, the tool automatically cuts according to the predetermined cutting path. At this time, attention should be paid to observe the change of cutting load in the automatic machining process through the cutting load table, and adjust the cutting amount according to the bearing condition of the tool to play the efficiency of the machine tool.

(2) Monitoring of cutting sound during cutting

In the automatic cutting process, when the cutting tool generally starts, the sound of the cutting workpiece is stable, continuous and light, and the movement of the machine tool is stable at this time. With the progress of the cutting process, when the workpiece has a hard point or tool wear or tool clamping and other reasons, the cutting process is unstable, unstable performance is the cutting sound changes, the tool and the workpiece will collide with each other, the machine will vibrate. At this time, the cutting amount and cutting conditions should be adjusted in time. When adjusting, the machine tool should be suspended to check the condition of the tool and the workpiece.

(3) Monitoring of finishing process

Metal machining is mainly to ensure the processing size and surface quality of the workpiece, the cutting speed is high, and the feed amount is large. At this time, attention should be paid to the impact of chip accumulation on the machining surface, and for the cavity processing, attention should also be paid to the corner processing and letting the knife. To solve the above problems, first, pay attention to adjusting the spray position of the cutting fluid, so that the machining surface is always in the cooling condition; The second is to pay attention to the quality of the workpiece has been processed, by adjusting the cutting amount, as far as possible to avoid changes in quality. If the adjustment is still not made, it should be stopped to check whether the original program is reasonable.

(4) Tool monitoring

The quality of the tool largely determines the machining quality of the workpiece. In the automatic machining cutting process, the normal wear condition and abnormal damage condition of the tool should be judged by sound monitoring, cutting time control, suspension inspection during cutting, workpiece surface analysis and other methods. It is necessary to deal with the tool in time according to the processing requirements to prevent the processing quality problems caused by the tool not being handled in time.