Diesel piston with bi-metallic dome
AssigneeGM Global Technology Operations LLC
InventorsJoseph C. Kopchick, Mark A. Osborne
Life of this patent
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Abstract
A diesel piston with a cast bi-metallic dome and a method of making the piston. In one form, the dome may include a laminate of a relatively high-temperature material, for example, stainless steel, and a relatively low temperature material, for example, aluminum or aluminum alloys, such that the portion of the dome made from the relatively high-temperature material is directly exposed to combustion within a cylinder into which the piston is placed. In another form, an aluminum coated stainless steel ring is used to form the dome. In one form, an ablation casting process may be used to manufacture the dome.
Claims11
A method of making a diesel piston comprising:
- providing a pattern for the piston including a dome;
- forming a piston mold around the pattern, the mold comprising an aggregate material and a binder;
- removing the pattern from the piston mold;
- placing a bimetallic ring in the piston mold;
- introducing molten metal into the piston mold with the bimetallic ring;
- contacting the piston mold with a solvent for the binder and removing the binder and the aggregate material;
- cooling the molten metal;
- and
- solidifying the molten metal to form the piston, the bimetallic ring comprising a first layer of aluminum or aluminum alloy and a second layer of stainless steel, and wherein the second layer forms an upper surface of the dome and the first and second layers are applied only to a flat region of the dome from an outside circumference of the piston to a rim of a combustion bowl.
A method of making a diesel piston comprising:
- providing a pattern for the piston including a dome;
- forming a piston mold around the pattern, the mold comprising an aggregate material and a binder;
- removing the pattern from the piston mold;
- placing a bimetallic ring in the piston mold;
- introducing molten metal into the piston mold with the bimetallic ring;
- contacting the piston mold with water and removing the binder and the aggregate material;
- cooling the molten metal;
- and
- solidifying the molten metal to form the piston, the bimetallic ring comprising a first layer of aluminum or aluminum alloy and a second layer of stainless steel, and wherein the second layer forms an upper surface of the dome and the first and second layers are applied only to a flat region of the dome from an outside circumference of the piston to a rim of a combustion bowl.
Dependencies are inferred from the claim text.