Patent ID: 8484825
Filing Date: 2013-07-16
Classification: B22D,B32B,C25D,Y10T

Abstract:
1. A method of producing an aluminum base part, comprising: preparing a pressing device including: supplying an aluminum alloy molten metal into said die to which said lower punch is fitted; a primary pressing step of collectively pressing said upper punch and said partial punch with pressing pressure generated by said first cylinder unit and said second cylinder unit, said upper punch and said partial punch being inserted into said die from an upper opening thereof, to compress said molten metal; a secondary pressing step of increasing the pressing pressure of said upper punch generated by said first cylinder unit, but not increasing the pressing pressure of said partial punch generated by the second cylinder unit, to further insert said upper punch into said die, thereby further compressing said molten metal, thereby forming a forging cast product; releasing said forging cast product from said die after solidification of said molten metal; nickel plating said forging cast product with a nickel plating layer to form a nickel plated forging cast product; and chromium plating said nickel plated forging cast product with a chromium plating layer.