Patent ID: 6886250
Filing Date: 2005-05-03
Classification: B21J,B21K,B23P,Y10T

Abstract:
1. A manufacturing method for an aluminum alloy wheel rim, comprising the following steps: (1) cutting a determined amount of aluminum alloy material; (2) heating and forming the determined amount of aluminum alloy material to make a marked center and fillet preformed blank that are placed in a setting/forming die to be forged into an H-shaped preformed blank; (3) forging the marked center and fillet preformed blank at high temperature in a setting/forming die into a preformed blank, wherein the marked center and fillet performed blank at high temperature produce a flow and expansion effect during the forging process; (4) punching the central axis of the H-shaped preformed blank at a high temperature and placing the punched H-shaped preformed blank in a setting/forming die of a rough forging blank; (5) forging the punched preformed blank at a high temperature in a preheated setting/forming die of a rough forging blank into an enlarged rough forging blank; and (6) forging the enlarged rough forging blank at a high temperature in a preheated finished forging die to form an aluminum alloy wheel rim, wherein the finished forging die includes two forming dies at two sides and two punching heads at front and rear sides; whereby, the metallic crystals of aluminum alloy being disposed at an extended state in high temperature and therefore the structure of metallic crystals of the aluminum alloy being not broken when the aluminum alloy blank is squeezed and extruded during the forging process.