Cracks at corresponding parts of punch shoulder: due to insufficient strength of the material, this defect will occur when the drawing load reaches the material breaking load. The defect occurs at the corresponding part (rp) of the shoulder R of the punch, which is closer to rp than the impact mark line. The impact mark line of the ruptured part can be observed and checked for the following situations, as it is different from other parts: or it can be extended; Or there are shiny parts above and below the flange; Or wrinkles may occur. In addition, there are sometimes shiny parts on the side walls. Initially, it ruptured laterally and presented as a tongue like shape.

After the workpiece is aligned and the program debugging is completed, it can enter the automatic processing stage. In the automatic machining process, 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:

The arrangement of processing sequence should be considered based on the structure of the parts and the condition of the blank, as well as the need for positioning and clamping, with the focus on ensuring that the rigidity of the workpiece is not damaged. The sequence should generally follow the following principles: the CNC machining of the previous process should not affect the positioning and clamping of the next process, and if there are general machine tool machining processes interspersed in the middle, comprehensive consideration should also be given.

The division of CNC machining processes can generally be carried out according to the following methods: the centralized tool sorting method is to divide the processes according to the used tools, and use the same tool to CNC machine all the parts that can be completed. Using the second and third knives to complete other parts that they can complete. This can reduce the number of tool changes, compress the idle time, and reduce unnecessary positioning errors.

Traditional mechanical processing is done by manually operating ordinary machine tools. During processing, the mechanical tools are shaken by hand to cut metal, and the accuracy of the product is measured using tools such as calipers with the eyes. Modern industry has long used computer digitally controlled machine tools for operations, and CNC machine tools can automatically process any product and component according to pre programmed programs by technicians. This is what we call "CNC machining". CNC machining is widely used in any field of mechanical processing, and it is also a development trend and an important and necessary technical means for mold processing.

Home appliance industry: control decorative panels for rice cookers, washing machines, microwaves, air conditioners, refrigerators, etc; Automotive industry: instrument panel, air conditioning panel, interior parts, headlight housing, logos, etc; Electronics industry: MP3, MP4 machines, computers, VCDs, DVDs, electronic notepads, cameras, and other decorative covers and signs; Computer industry: keyboard, mouse cover;