Scrap metal machine is large-size solid metal materials crushed to the required size of the professional machinery. According to the size of material to be broken can be divided into coarse crusher, intermediate crusher, atomizer mill, ultra-fine grinding machine.  In the crushing process, there are rolling, cutting, impact, grinding applied to the object. Rolling is mainly used in coarse and medium crushing and suitable for crush of hard materials and large materials. Cutting is mainly used in fine crushing and suitable for crush of ductile materials. Impact is mainly used in medium crushing, fine grinding, ultra-fine grinding and suitable for crush of brittle materials. Grinding is mainly used in fine grinding, ultra-fine grinding and suitable for crush of dead small and fine particles. The actual crushing process is the simultaneous effect of several outside forces.