How do fastener enterprises become "invisible champions"?

Have you ever heard of the Invisible Champion? Why do champions have to be invisible?

What are the reasons for clogging the blanking hole in precision stamping

When the stamping material in precision stamping is soft and magnetic adsorption material, the bigger the size of the blanking step hole of the punching die is, it is easy to induce transverse friction resistance, and eventually lead to the blockage of the blanking hole.