After annealing, include forging and annealing the ball in the mold making process stress annealing of two parts. Its main purpose: the raw materials stage to the improvement of crystal structure; to facilitate processing and reduce the hardness; after processing to prevent distortion and quench cracks to remove internal stress.

(1) Ball annealing.

Forged tool steel, the steel of the internal organization of the crystal becomes unstable, high hardness cutting difficult and such a state of steel, internal stress, deformation and quenching process is easily cracked, poor mechanical properties, for the carbide crystals into a ball and stability ball organization to carry out annealing.

(2) To stress annealing.

Residual stress is on the die steel for mechanical processing, after the process will produce distortion. If the stress left after machining, quench occurs in the large deformation or quenching cracks. To prevent these problems, stress the need for annealing.

German heat treatment experts repeatedly stressed this point, he brought the German data also demonstrated that in Germany to stress annealing process is indispensable for mold manufacturing process of an important process.

We adhere to the mold making process three times to stress annealing:

(1) the volume of raw materials in the cutting off 1 / 3 of the shape or thickness of material 1 / 2the depth of processing, machining allowance left 5 ~ 10mm, for the first time to stress annealing.

(2) Finishing the left margin (2 ~ 5mm), the second to stress annealing.

(3) In the test mode, the third time before quenching to stress annealing.

 

 



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