Copper forging usually through forging, cutting, heat treatment and other processes. In order to ensure the quality of mold manufacturing, reduce the production cost, the materials should have good ductility and machinability, hardenability and hardenability and grindability; should have oxidation, decarburization sensitivity and quenching cracking tendency of small deformation.
1, malleable: low thermal deformation resistance, good plasticity, wide range of forging temperature, cold cracking and precipitation, carbide network tendency is low.
2, annealing process: spheroidizing annealing temperature range is wide, annealing hardness is low, and fluctuation range is small, spheroidization rate is high.
3, cutting: cutting large amount, low tool loss, low surface roughness.
4, oxidation and decarburization sensitivity: when heated to high temperature oxidation with good decarburization rate is slow, not sensitive to the heating medium, produce pitting tendency.
5. Hardenability: uniform and high surface hardness after quenching.
6, hardenability: after quenching can get deeper hardening layer, using mild quenching medium can harden.
7, quenching deformation and cracking tendency: conventional quenching volume change is small, shape warpage and distortion is slight, abnormal deformation tendency is low. Conventional quenching has low cracking sensitivity and insensitivity to quenching temperature and workpiece shape.
8, grinding: grinding wheel is relatively small loss, no limit of grinding burn of large amount, is not sensitive to the quality of the grinding wheel and the cooling conditions, not prone to abrasion and grinding crack.