Aluminum die casting
First Claim
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1. A method of forming a hard working surface in an aluminum die casting of the type having a region of increased hardness extending a minimum depth below a surface of said die casting as-cast, the method comprising machining said as-cast surface of said die casting to a depth less than said minimum depth of said increased hardness region to form a hard working surface on said die casting to a desired configuration and surface finish as a result of said machining.
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Abstract
An aluminum workpiece is die cast to near net shape and subsequently only finish machined such that a portion of the hard surface region remains in the aluminum and is available as a hard working surface having a desired configuration and surface finish.
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Citations
26 Claims
- 1. A method of forming a hard working surface in an aluminum die casting of the type having a region of increased hardness extending a minimum depth below a surface of said die casting as-cast, the method comprising machining said as-cast surface of said die casting to a depth less than said minimum depth of said increased hardness region to form a hard working surface on said die casting to a desired configuration and surface finish as a result of said machining.
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6. A method of forming a hard working surface in an aluminum die casting of the type having a region of increased hardness extending a minimum depth below a surface of said die casting as-cast, the method comprising:
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a) precision casting of the die casting such that at least a portion of the as-cast surface of said die casting corresponds to a near net shape; and b) machining said near net shape only to a depth less than said minimum depth of said increased hardness region to form a hard wear-resistant working surface finish on said portion of said die casting as a result of said machining. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming an integral hard working surface on an aluminum die casting comprising only the steps of:
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die casting an aluminum workpiece to near net shape, such that said aluminum workpiece is intrinsically thereby formed with a relatively thin surface region of increased hardness, wear resistance and non-porosity relative to a softer, less wear resistant and more porous bulk region interior to said workpiece; and finish machining said workpiece to a net shape of desired configuration and finish, such that at least a portion of said relatively thin surface region remains in the aluminum workpiece as said integral hard working surface. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification