Thread rolling plate

When the edge cutting die is working, its edge part is subjected to intense friction and extrusion, and is affected by a certain impact force, which requires the edge cutting die to have higher hardness, strength, wear resistance and better toughness, so the choice of material is very critical.

Edge cutting die adopts Cr12MoV steel outer hexagon edge cutting die, its performance can be improved.Compared with 9SiCr steel, Cr12MoV steel has higher carbon content and high chromium content, and lower Si content, so Cr12MoV steel has high hardenability, high abrasion resistance, and hardness and toughness are relatively ideal.

Forging, spheroidal annealing and machining of raw materials of 9SiCr steel and Cr12MoV steel can eliminate the defects of the raw materials such as weigeler structure and reticular carbide, so that the structure is densified and the marked mold can greatly improve the original structure.Especially for Cr12MoV steels, due to its high carbon high chromium steel, made of the trimming edge often due to uneven carbide distribution collapse edge occur in use, therefore, must be forged, instead it: instead of forging process for forging billet heating temperature is 1100 ~ 1150 ℃, forging temperature is 1080 ~ 1100 ℃, the final forging temperature is 860 ~ 880 ℃, the change of carbide segregation after forging, below level should be in 2 ~ 3 still need timely annealing after forging.