Generally, the manufacturing of the mould has to go thr […]
Generally, the manufacturing of the mould has to go through several processes such as forging, cutting and heat treatment. In order to ensure the manufacturing quality of the die and reduce the production cost, the material should have good malleability, machinability, hardenability, hardenability and grindability, as well as small oxidation, decarburization sensitivity and quenching deformation cracking tendency.
1. Malleability: it has low hot forging deformation resistance, good plasticity, wide forging temperature range, low forging crack cold crack and precipitation network carbide tendency.
2. Annealing process: wide range of spheroidizing annealing temperature, low annealing hardness, small fluctuation range and high spheroidizing rate.
3. Machinability: large cutting amount, low tool loss and low surface roughness.
4. Sensitivity to oxidation and decarburization: good oxidation resistance, slow decarburization speed, insensitive to heating medium, little tendency to produce pockmarks.
5. Hardenability: it has uniform and high surface hardness after quenching.
6. Hardenability: after quenching, a deeper hardenable layer can be obtained, which can be hardened by using a mild quenching medium.
7. Quenching deformation and cracking tendency: conventional quenching has small volume change, slight shape warpage and distortion, and low abnormal deformation tendency. The cracking sensitivity of conventional quenching is low, and it is not sensitive to quenching temperature and workpiece shape.
8. Grindability: the relative loss of grinding wheel is small, the burn free limit grinding consumption is large, it is not sensitive to the quality and cooling conditions of grinding wheel, and it is not easy to produce grinding damage and grinding cracks.