Metal stamping process mold crack, is this very common situation, but more serious at that time, is a template suddenly divided into several pieces. There may be a variety of conditions that cause molds to crack immediately, from the purchase of raw materials for stamping dies to the operation of stamping processes, which can cause harm. There are several reasons for mould cracking during metal stamping processing

 

Analysis on the cause of die bursting during metal stamping processing

 

Metal stamping process mold crack, is this very common situation, but more serious at that time, is a template suddenly divided into several pieces. There may be a variety of conditions that cause molds to crack immediately, from the purchase of raw materials for stamping dies to the operation of stamping processes, which can cause harm. Causes of mold cracking during metal stamping processing include:

 

1, blanking is not as expected

 

No demagnetization solution before production and manufacturing, no discharge tip; There are broken needles, broken elastic yellow and other sticking materials in the production; Assembly mold when there is no leakage excrement, or roll blocking excrement, pad foot blocking excrement, this is the most common, assembly if the old master does not pay attention to, like blanking hole more that time, or when the mold has protective layer cushion block, the most easy to appear this kind of situation.

 

2. Design the processing technology

 

The die compressive strength is insufficient, the wound spacing is too close, the die design is not scientific, and the number of mold blocks is insufficient.

 

3. Quenching and tempering treatment: Heat treatment and quenching process is not good enough to cause deformation

 

In practice, the heat treatment quality of the die has great harm to its characteristics and service life. According to the analysis and statistical analysis of mold invalidation, the "safety accident" caused by heat negligence accounted for about 40%.

 

4. Wire cutting negligence

 

Ground line cutting, line cutting gap to solve the error, did not make the Angle and mildew layer damage line cutting. The tooth surface of stamping die is processed by line cutting. Because the thermoelectric effect of wire-cutting processing and electrolysis effect, causing the surface layers of mould manufacturing must be thick layers of mildew, decrease the surface strength, such as microscopic cracks, result in wire-cutting processing of stamping die is easy to produce the early damage, immediate harm die of cold stamping gap to maintain and tooth surface is very easy to collapse edge, reduce the mold trial. Therefore, in the line cutting processing, should choose effective electrical gauge, as far as possible to avoid mildew layer deep.

 

5. Adoption of high-speed punch press machinery and equipment

 

High speed punch tonnage, cold punch pressure is insufficient, die adjustment is probably too deep. Precision and rigidity of punching machine (such as punching machine) are very important to the service life of stamping die. The precision and rigidity of the punching machine greatly increase the service life of the punching die. For example, the raw material of the multifunctional ferrite magnetic core stamping die is Crl2MoV, which is applied to the general open-type punching machine. The average service life of the re-grinding is 10,000-30,000 times. The service life of the stamping die can reach 60,000-120,000 times in the application of the new high precision punching machine.