Analysis of the Flow Process of the Carbonized Layer during Motorcycle Chain Wheel Processing:
(1) The carburized motorcycle sprocket requires a carburized layer to be distributed on the tooth surface. When using the "carburization warm extrusion" process, the distribution of the carburized layer is closely related to the deformation mode of the gear forming. For the tangential diversion extrusion process, the carburized layer at the gear teeth is deeply redistributed from the carburized layer on the surface of the cylindrical billet. The process of gear "carburizing warm extrusion" has a short deformation time, and the diffusion effect of the infiltration layer can be ignored. Obviously, after the cylinder becomes a gear, the surface area increases significantly, and the thickness of the carburized layer changes greatly. When the carburized layer is subjected to tangential compression during the forming process, the thickness of the carburized layer increases, and vice versa, the thickness decreases; And the change in thickness of the carburized layer is determined by the magnitude of tangential deformation. Therefore, by controlling the magnitude of tangential deformation of the carburized layer during the warm extrusion process of gears, the distribution of carburized layer thickness can be controlled (2) Based on the understanding of the forming process of motorcycle sprocket teeth, further discussion is made on the change from the cylindrical carburized layer to the gear carburized layer when forming the gear teeth: the carburized layer on the surface of the cylinder pressed by the concave die teeth becomes the carburized layer at the root of the gear teeth, and the earlier it participates in deformation, the greater the elongation rate, and the thinner the carburized layer; On the contrary, due to the concave die extrusion, when the compressed part is concave into the tooth root, the metal in the compressed part between the concave die teeth flows radially to become the tooth top part. This part of the metal is compressed by two adjacent concave die splitter teeth in its superior product, and its infiltration layer thickness increases; As the deformation increases, if sufficient friction is applied to the concave mold in contact, the thickness of the carburized layer may decrease when stretching occurs