Netizens say that punching a 3mm thick SPHC steel back with DC53 has caused eight or nine thousand burrs. They have changed many types of tool steel and are getting tired of it. May I ask what tool steel to use?
Having seen his products, the burrs are mainly caused by the adhesion wear of the adhesive material, and the burrs appear only after 8K-9K processing. The occurrence of burrs in such a short period of time is sufficient to confirm that it is the adhesion wear of the adhesive material.
DC53 is a high carbon steel with a carbon C content of 1.5%. There is a large amount of microscopic and fine crack segregation in the structure that cannot be seen by the naked eye. When these fine cracks encounter iron during stamping, adhesive wear of the material will occur. Now, burrs appear in the production of 8K-9K, which also proves this point, indicating that DC53 is not suitable for stamping in this working condition.
For the steel back stamping of SPHC iron material, based on the performance requirements of the mold and past cases, I recommend 8566 anti collapse tool steel.
Mr. Lin’s mold is a precision punched 8mm thick ASPH440 material automotive brake steel back part. When using SKH-51 for stamping hundreds of products before, the mold would encounter cracking problems. Switching to DC53 for stamping would have a worse effect, and the product is prone to burrs and the bright band cannot meet the requirements.
Mr. Lin’s stamping material is the same as that of the netizen, and it is thicker than him. It is a precision stamping with very small stamping gaps and requires a bright band. The working conditions are even worse, and the performance requirements for the mold are higher. Originally, using DC53 was also prone to burrs. The mold material is the same, and the failure mode is similar. However, Yuhui 8566 die steel can withstand 25000 stamping cycles without cracking, and its service life is several times longer.
So, the netizen punched a 3mm thick SPHC steel back, DC53 punched eight or nine thousand burrs, and changed the tool steel to be troublesome. I recommend you to use 8566 anti collapse tool steel.
The punch cracking is made of 8566 die steel, which is a double-edged sword in both old and new societies. Those who have used it will buy it.