During the production and processing of metal stamping, mold cracking is a common occurrence, but in more severe cases, a single template is suddenly divided into several parts. Perhaps, there are various reasons for the immediate cracking of the template, from purchasing raw materials to operating steps of the stamping mold, which can cause harm to it. The reasons for mold cracking during metal stamping production and processing include

Mold cracking during metal stamping production and processing is a common occurrence, but in more severe cases, it is the sudden division of a template into several parts. Perhaps, there are various reasons for the immediate cracking of the template, from purchasing raw materials to operating steps of the stamping mold, which can cause harm to it. The reasons for mold cracking during metal stamping production and processing include:

1. Hardware precision parts processing manufacturers are not satisfied with material cutting

No demagnetization treatment or material return before production and processing; There are stuck materials such as broken needles, broken bullets, and yellow during production and processing; When assembling the mold, there is no leakage, rolling or standing on tiptoe, which is the most common. If the master assembler does not pay attention, such as when there are many drop holes or when the mold has protective layers and pads, this type of situation is most likely to occur.

2. Scheme design and production process

The tensile strength of the mold is insufficient, the distance between the wounds is too close, the mold design scheme is unreasonable, and the number of mold pieces is not enough without a protective layer cushion block.

3. Quenching and tempering heat treatment: deformation caused by improper production process of quenching and tempering heat treatment

Social experience shows that the quality of the heat treatment process of molds has a significant impact on the characteristics and service life of molds. According to the analysis data of the Failure cause of the mold, the "safety production accidents" caused by the mold failure due to thermal paralysis accounted for about 40%.

4. Careless thread cutting numbness

The metal stamping processing manufacturer's wire cutting and wire cutting did not handle the gap correctly, resulting in damage to the mold layer caused by not cleaning the corners and wire cutting. Stamping die journals are often processed by wire cutting. Due to the Seebeck effect of wire cutting machining and the action of electrolytic salt water, the production and manufacturing surface of the mold results in a thick and thin mold layer, resulting in a decrease in surface compressive strength and the appearance of optical microscope cracks. This leads to early damage of the stamping mold during wire cutting machining, as well as damage to the maintenance of the gap between the cold stamping mold and the easy breakage of the journal, reducing the service life of the mold. Therefore, in online cutting processing, reasonable electrical standards should be selected to minimize the deep layers of mold formation.

5. Selection of mechanical equipment for stamping machine tools

The tonnage of the stamping machine tool is insufficient for the cold stamping force, and the mold adjustment is approximately too deep. The accuracy and Bending stiffness of stamping equipment (such as stamping machine tools) are extremely important to the damage of the service life of stamping dies. The stamping equipment has high precision and good Bending stiffness, and the service life of stamping dies has been greatly improved. For example, the raw material of complex Ferrite core stamping die is Crl2MoV, which is used on general open type stamping machine tools, and the average service life of regrinding is 1-3 million times; In the use of new high-precision stamping machines, the regrinding service life of stamping molds can reach 60000 to 120000 frequency cycles.