What are the reasons for the poor heat treatment of automobile stamping molds?

The metal stamping die is prone to cracks after quenching, which causes the die to be scrapped:

• 1. There is serious carbide segregation in the original structure of the metal stamping die steel material.
• 2. Poor forging process, such as high forging heating temperature, small deformation, high stopping forging temperature, slow cooling rate after forging, etc., make the forging structure coarse and there are net, band and chain carbides, which make the ball. Difficult to remove during annealing.
• 3. Poor spheroidizing annealing process, such as too high or too low annealing temperature, short isothermal annealing time, etc., can cause uneven spheroidizing annealing structure or poor spheroidization.

After quenching, the metal automobile stamping part mold is prone to cracks, causing the solution to scrap the mold:

• 1. According to the working conditions of the mold, the production batch and the toughening performance of the material itself, select the mold blank of high-quality metal automobile stamping parts.
• 2. Improve the forging process or use normalizing preparatory heat treatment to eliminate the inhomogeneity of reticulated and chain carbides and carbides in the raw materials of automobile stamping parts.
• 3. For high carbon die steel with severe carbide segregation that cannot be forged, solid solution refining heat treatment can be performed.
• 4. Formulate the correct spheroidizing annealing process specification for the die blanks of the forged metal automobile sheet metal parts, and can use quenching and tempering heat treatment and rapid spheroidizing annealing.
• 5. Reasonably install the furnace to ensure the uniformity of the temperature of the mold blank in the furnace.