How to choose materials for plastic AC plug molds?

How to choose materials for plastic AC plug mold

A precision plastic AC plug mold is a small and medium-sized plastic AC plug mold with a complex shape, and its processing cost accounts for a high proportion of the production cost of the AC plug mold. Therefore, the cutting efficiency of the AC plug mold is improved, which reduces the production cost of the AC plug mold. One of the main factors.

Choosing free-cutting steel can save the cutting processing cost in the manufacturing process of the AC plug mold. The AC plug mold selects 8Cr2s (8Cr2MnWMoVS) steel, which has high hardenability, and Φ100mm can be air-cooled and hardened. 8Cr2S steel is selected for slow cooling after forging and isothermal annealing after forging is performed in time. The annealing temperature is determined to be 790~810℃, heat preservation for 2h, isothermal at 700℃, heat preservation for 4h and furnace cooling to 550℃ for air cooling.

　　Rough machining the cavity after annealing, leaving 1~2mm finishing allowance. Then the quenching and tempering process is: preheating temperature 600 ℃ holding 1h, quenching temperature 890 ℃, holding 25min after air quenching, air quenching hardness> 60HRC, tempering temperature 600 ℃ holding 2h, the hardness after tempering is 46 ~ 48HRC . After quenching and tempering, finish forming.