Common problems in the use of cemented carbide

• Mold failure:

• Fatigue cracks: When carbide molds are subjected to repeated impact loads (such as cold heading molds, stamping molds, etc.) or cyclic stress (such as die-casting molds), fatigue cracks will occur on the mold surface or inside. These cracks will gradually expand with the increase of usage time, eventually leading to mold failure.

• Edge collapse: During stamping, cold heading and other processing, if the die is subjected to excessive impact force or the die structure design is unreasonable, the carbide at the edge of the die may collapse. For example, when punching thick plates or high-hardness materials, if the die gap is too small or the edge radius is inappropriate, it is easy to cause edge collapse.

• Plastic deformation: When the load on the die exceeds its yield strength, the die will undergo plastic deformation. For carbide dies, although their hardness is high, they may still undergo a certain degree of plastic deformation under high temperature or high stress conditions. For example, in hot forging dies, if the forging temperature is too high or the forging force is too large, the die cavity may undergo local plastic deformation, affecting the dimensional accuracy and quality of the forging.