A CLOSE TYPE COLD FORGING METHOD AND THE DEVICE THEREOF FOR A SIDEGEAR OF DIFFERENTIAL LIMITATION EQUIPMENT

摘要

PURPOSE: A close type cold forging method for a side gear of differential limitation equipment and a device thereof are provided to reduce loss of the molding material and remove a separate cutting process. CONSTITUTION: A backup spline is molded in the circumference side of the bottom of the molding material(S11). A backup bevel gear is molded on the top of the molding material(S21). The molding material is positioned in the third low die including the spline final molding unit. A third upper mold including the bevel gear final molding unit pressurizes the molding material and spline and bevel gear are the final molding(S31). The molding material in which the backup spline is formed is disunited through the first lower part knockout from the first low die(S13) The molding material finishing each process is disunited through the second and the third lower part knockout from each low die. The lower part inner shaping section formed on the top of the second lower part knockout is used. The backup lower part inner which is impregnated in the lower part of the molding material and is formed is molded.