| 摘要 |
PURPOSE: A method and an apparatus for manufacturing brake drum for automobile are provided to realize weight lightening and improve braking characteristics by molding a rear brake drum by melt forging process using a certain aluminum composite material. CONSTITUTION: The method comprises the steps of melting an aluminum composite material, followed by keeping it at a temperature of about 700 deg.C in a heat reserving furnace; injecting melt(16) into a certain injection unit; injecting the melt to the cavity of the metal mold die at a high pressure of 100 MPa or greater so that the melt is filled into cavity(26) of metal mold die(10) vertically positioned at the upper side of injection part of the injection unit; maintaining the melt filled in the cavity of the metal mold die to a certain pressure for about 15 seconds; and stripping brake drum(100a) in the solidified state from the metal mold die. The apparatus comprises a main cylinder(20) vertically driven by piston(18); a subsidiary cylinder(28) horizontally driven by the piston in such a way that the main cylinder is inclined; and an injection pipe(22) formed in an opened space into which the melt(16) is injected in the upper part of the main cylinder and positioned perpendicularly to the lower side of injection guiding frame(24) formed on the bottom of the metal mold die(10), wherein the main cylinder, subsidiary cylinder and injection pipe are vertically arranged in upper and lower directions of the bottom of the metal mold die.
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