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Mold material: the basis for determining life and accuracy
Jan 27,2024
The choice of mold materials needs to balance cost, life and processing difficulty. Common materials include：
Pre-hardened steel (such as 718H): hardness 30-35HRC, suitable for small and medium-sized mass production (100-500,000 mold times), simple processing and low cost (about 50 yuan /kg), commonly used in household appliance shell molds.
Quenched steel (such as H13, S136): After heat treatment, the hardness reaches 45-55HRC, the wear resistance is excellent, and it can withstand the production of more than 1 million molds. It is suitable for glass fiber reinforced plastics (such as auto parts) or high-precision optical molds, but the processing is difficult and the cost is 2-3 times that of pre-hardened steel.
Aluminum alloy (such as 7075): light weight, fast thermal conductivity, suitable for rapid prototyping molds or small batch production (100,000 to 100,000 molds), the processing cycle is 50% shorter than steel molds, but the wear resistance is poor and cannot be used for high-viscosity plastics.
Copper alloy: The thermal conductivity is more than 5 times that of steel. It is commonly used to make cooling inserts to accelerate the cooling of thick-walled parts (such as battery housings).
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