Generally, the manufacture of shear blades requires sev […]
Generally, the manufacture of shear blades requires several processes such as casting, cutting, and heat treatment. In order to ensure the manufacturing quality of the blade of the shears and reduce the production cost, pay attention to the forgeability, cutting processability, hardenability, hardenability, and grindability of the material in the selection of the material; it should also have small oxidation and delamination. Carbon sensitivity and tendency to crack during quenching.
Forgeability: Shear blades should have low resistance to hot forging deformation, good plasticity, wide casting temperature range, low tendency for forging cracks, cold cracking and precipitation of reticulated carbides.
Annealing processability: The spheroidizing annealing temperature range is wide, the annealing hardness is low, the fluctuation range is small, and the spheroidizing rate is high.
Machinability: Large amount of cutting, low tool wear, and low surface roughness.
Oxidation and decarburization sensitivity: Good resistance to oxidation when heated at high temperature, slow decarburization rate, insensitivity to heating medium, and low tendency to pitting.
Hardenability: It has average and high surface hardness after quenching.
Hardenability: A deeper hardened layer can be obtained after quenching, which can be hardened with a mild quenching medium.
Quenching deformation and cracking tendency: The conventional quenching has small volume change, slight warpage and distortion, and low abnormal deformation tendency. The cracking sensitivity of conventional quenching is low, and it is not sensitive to the quenching temperature and the shape of the workpiece.
Grindability: The relative wear of the grinding wheel is small, the maximum amount of grinding without burns is large, the blade of the shears is not sensitive to the quality of the grinding wheel and the cooling premise, and it is not easy to wear and crack.