Q: What kind of material is used for cold heading die, can tungsten steel be used? (Why is the material of tungsten steel always cracked?)
A: Tungsten steel has high hardness, good wear resistance and long service life. YG20C and YG15 are commonly used. When tungsten steel molds are used, steel sleeves need to be tightly welded on the outside, and they can be used together.
The main reason for using tungsten steel is cracking. Yes: the choice of the brand is wrong, the greater the impact, the greater the cobalt content should be selected; the mold should be made reasonably, the clearance should be within a certain range; the quality of tungsten steel itself is unstable, it is recommended to select some professionally produced products.
Of course, cold work die steel Cr12 or Cr12MoV is also available. For the hardness of Cr12 and Cr12MoV materials _ heat treatment, you can consult our online customer service.
Q: What kind of tungsten steel can be processed in the middle of the cold rolling mold?
A: Tungsten steel refers to cemented carbide, and cemented carbide wants to be processed by ordinary tools; it can only be processed by EDM, wire cutting, diamond grinding, bench grinding and polishing. . For steel-bonded cemented carbide, it can be processed by cutting. At this time, the cutting tool can be processed by a general YT type tool, and the hardness can be made to be HRC 68 to 73 by heat treatment after the processing.
Q: Which kind of material is used for the cold-rolled 40Cr product?
A: The domestic die D2 is enough for the die. The punch can be selected. It is recommended to use Hitachi SKD11 die steel. It is better to use DC53 or sld8. These two are improved models of SKD11, and they are capable of performance. The service life is different, depending on the specific situation.
Q: What is the 40-45 degree metallographic structure of the hard alloy cold heading die and the outer casing after 40cr or 45cr steel heat treatment?
A: If the mold is not stressed when working, it is ok to use 40Cr as the mold shell. The metallographic structure of HRC40-45 at this time should be tempered troostite + tempered sorbite. If the tempering is insufficient, the brittleness is greater. Therefore, you can't do a mold with a lot of force.