Method for molding gear

• Main Authors: LIN YUTING, LIN ZHIHAO, ZHENG CONGREN
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2010
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL ENGINEERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

The invention discloses a method for molding a gear. The method comprises the following steps of: firstly, obtaining a blank, and then backwards extruding the blank by applying a molding die so as to form an inner hole and a proper axial blank length meanwhile; precisely punching to remove a left solid blank part of the inner hole of the blank in the axial direction so as to form a through hole; then trimming the through hole to form a high-precision inner hole; and positioning based on the high-precision inner hole to carry out a stamping operation of gear shape of the blank outline so as to form a gear. By adopting the invention, die change time required by cold forging and hot forging can be reduced, and the die change can be finished by a single cold forging and molding method, therefore, the processing time and cost can be greatly reduced.