The cause of the mold ellipse (deformation)

This is because of the presence of uneven carbides distributed in a certain direction in the die steel. The coefficient of expansion of the carbide is about 30% smaller than that of the steel. When heated, it prevents the inner hole of the mold from expanding, and prevents the inner hole of the mold from shrinking when cooled. The unevenness of the inner hole of the mold is caused, and the round hole of the mold is elliptical.
Precautions 1 When manufacturing sophisticated molds, try to choose mold steel with less segregation of carbides. Do not use cheap steel.
2 For the die steel with serious segregation of carbides, reasonable forging should be carried out to break up the carbide ingots, reduce the grade of uneven distribution of carbides, and eliminate the anisotropy of properties.
3 The forged die steel shall be subjected to quenching and tempering heat treatment to obtain a uniform, fine and dispersed carbide structure of the carbide, thereby reducing the deformation of the precision complex mold after heat treatment.
4 For molds with large size or forging, it can be treated by solid solution double refining, which makes the carbide refinement, uniform distribution and rounded corners, which can reduce the heat treatment deformation of the mold.

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