The forging process includes: cutting the material to the desired size, heating, forging, heat treating, cleaning and inspection. In small-scale manual forging, all these operations are carried out in a small space by several forges. They are all exposed to the same hazardous environmental and occupational hazards; in a large forge, the hazards vary from job to job. In this regard, commutator manufacturers can mainly reflect their chemical composition and metal structure in their forging performance processing.
(1) Chemical composition
The chemical composition of the metal is different, the internal crystal structure is different, and the casting function is also different. Generally, the silver casting performance of pure metal is better than that of alloy; the casting performance of carbon steel is better than that of alloy steel; the casting performance of low alloy steel is higher than that of high alloy steel. Carbon steel is small, and with the increase of carbon content, its rationality decreases, and its casting performance changes. Pieces can get worse.
(2) Metal structure
Metals with the same chemical composition only have different casting properties. The casting performance of the round solution (such as austenite) alloy is better than that of the multi-phase alloy; the casting performance of carbide (such as cementite) is poor; state time. Its casting performance is worse than that of the fine and uniform microstructure.