At present, there are roughly three kinds of materials used in the punching die of crown-shaped bottle caps. One is a Cr12MoV die steel, one is a cemented carbide, and the other is an insert cemented carbide. These three materials have both advantages and disadvantages. Cr12MoV steel is easy to machine, but its wear resistance is good, and the service life of 3 million bottle caps can be restored. Carbide has high hardness and good wear resistance. It has 90 to 1.1 billion bottle caps at one time, but it is difficult to process. Currently, it can only be formed by traditional powder metallurgy methods. The machining can only adopt EDM, wire cutting and diamond. Grinding wheel, the matrix is ​​easy to produce carbide aggregates, easy to produce brittle cracks in use. With the damascene method, because the walls are too thin, the hard alloy is hard to set up...
In view of the above reasons, the birth of the DL steel makes up for the above deficiencies. It is a material between the die steel and the cemented carbide. It has both die steel workable, heat treatable, malleable, and high hard alloy hardness. Good wear resistance. The production of crown cap blanking die is similar to cemented carbide in terms of cost (slightly lower), and its service life is close to that of hard alloy. Currently, some domestic manufacturers have begun to use it.
DL steel main performance indicators:
Flexural strength 2300~2550 kg/mm2
Impact toughness 16~20 kg·cm 2
Hardness (HRC) 60~64