For Air Cooler Mould(FURNITUREMOULD) and other precision parts, many molders prefer to use alloy mold steel because of the reduced likelihood of deformation. Prolonged heating during carburizing has a certain effect on the size of the steel. Therefore, a lot of experience and careful consideration must be used to achieve contraction and growth.

For example, it is difficult to convert the manufacturer’s data on shrinkage and growth during carburization and heat treatment into numbers, which will enable each part of the mold of the typewriter housing to be realized. By using a hard alloyed steel of high alloy type, the long heating time of carburization is eliminated, thereby eliminating some of the factors that affect deformation. Of course, tool steels need to be handled with care, and some high speed steels require considerable heating time.

In this case, the shortest time advantage in the furnace is not always clear. Some air cooler mould processing applications require the use of tool steel because carburized steel is not suitable. For example, the hob must be very hard on the surface and the hardness should extend quite deep to the center so that the hob resists the severe break it must withstand and also has high tensile strength. The hob can be made of air hardened, water hardened or oil hardened tool steel. Oil hardening is generally preferred, and water hardened steel is the least used and then typically used only for small, simple parts that are not severely cracked during heat treatment and are not subject to heavy rolling.

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