1冷却的目的是什么?答:众所周知,反复弯折一根铁丝,在铁丝弯折处会发热;用铁锤打击室温下的金属使它产生塑性变形如厚的打成薄的,园的打成方的,粗的打成细的,金属也会发热,这些现象类同带钢冷轧时的变形热,同属一种物理本质。亦即对金属施加外力使之产生塑性变形的过程中,对金 What is the purpose of cooling? A: As we all know, repeatedly bending a wire, the wire bend will be fever; with a hammer against the metal at room temperature to make it plastic deformation, such as thick thin, Into a square, rough labeled fine, the metal will be hot, these phenomena are the same with the cold strip deformation heat, belong to the same physical nature. That is, the external force exerted on the metal plastic deformation process, the gold