Selection of the three principles of mold

(B) the mold meet the technical performance requirements

Mold manufacturing generally go through forging, machining, heat treatment, several processes. To ensure the quality of the mold manufacturing, lower production costs, the material should have good malleability, machinability, hardenability, hardenability and can be grinding of; should also have a small oxidation, decarbonization sensitivity and hardening deformation cracking tendency.

1, malleable

Deformation resistance of hot forging with a lower, plastic, forging temperature range, cold forging crack crack mesh carbide precipitation and a low propensity.

2, the annealing process of

Ball annealing temperature range, low hardness and the fluctuations in annealed small range, the ball high.

3, the cutting of

Large cutting tool, low loss, low surface roughness.

4, oxidation, decarbonization sensitivity

Pregnant when heated to high temperatures can be a good antioxidant, decarburization slow, not sensitive to the heating medium, resulting in pitting tendency of small.

5, hardened

After quenching with a uniform and high surface hardness.

6, hardenability

After quenching the hardened layer can be deeper, with ease of quenching medium can be hardened.

7, the quenching deformation cracking tendency

Conventional quenching small volume change, shape warping, slight distortion, a low propensity abnormal deformation. Low sensitivity of conventional quench cracking on quenching temperature and the shape of the workpiece is not sensitive.

8, may be grinding of

Grinding wheel is relatively small loss, no amount of grinding burn limit large, the quality of the wheel and the cooling conditions are not sensitive, less prone to injuries mill grinding cracks.

(C) to meet the economic requirements of the mold

In the selection is to die, we must consider the principle of economy as much as possible to reduce manufacturing costs. Therefore, to meet the performance under the premise of first use cheaper, can not steel on steel, can use domestic materials do not need to import materials. In addition, the market should also be considered in the selection of the production and supply of selected steel should be minimal and concentrated, easy to buy.

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