Methods for forging a piston blank
AssigneeKs Kolbenschmidt US, Inc.
InventorsDavid J. Boye, Bryan Quinn, Joseph Stojkov, Joshua Cota, Scott D. Bailey
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Abstract
Methods for forging a piston blank are disclosed such that the forged piston blank is in a near-net shape and size of a final piston. Bending a flange to form a cooling channel can be done with reduced or no preliminary machining away of core material relative prior to bending the flange.
Claims6
A method for forging a piston blank to a near-net shape having a cooling channel formed from a flange which, in turn, is formed from a pre-flange and a skirt portion depending from the flange, the method comprising:
- heating a billet;
- while heated, shaping the billet by at least one hit in a die;
- allowing cooling of the shaped billet;
- heating a pre-flange portion of the shaped billet while maintaining a skirt portion at a temperature sufficiently cool to retain the shape of the shirt portion;
- and
- upsetting the pre-flange portion of the billet to form a flange, thereby forming a piston blank having a near-net shape, wherein the piston blank having the flange opposite the skirt portion, the flange being spin-bendable to form a cooling channel without preliminary removal of material.
A method for forging a piston blank to a near-net shape having a cooling channel formed from a flange which, in turn, is formed from a pre-flange and a skirt portion depending from the flange, the method comprising:
- heating a steel billet;
- while heated, shaping the billet to form a pre-flange portion and a skirt portion;
- cooling the shaped billet;
- heating the pre-flange portion to a temperature permitting deformation while maintaining the skirt portion at a temperature substantially resisting deformation;
- upsetting the pre-flange portion of the billet to form a flange spaced apart from the skirt, thereby forming a piston blank having a near-net shape, wherein the flange spaced apart from the skirt portion comprises a steel core between the flange and the skirt portion, and the flange being spin-bendable to form a cooling channel without preliminary removal of material from the steel core.
A method for forging a one-piece piston blank to a near-net shape having a cooling channel formed from a flange which, in turn, is formed from a pre-flange and a skirt portion depending from the flange, the method comprising:
- heating an entirety of a steel billet;
- shaping the billet to form (a) a pre-flange portion wherein at least a region of the pre-flange portion has a conical-like shape and (b) a hollow skirt portion;
- cooling the shaped billet;
- heating the pre-flange portion to temperatures permitting deformation while maintaining the skirt portion at a temperature preventing substantial deformation;
- and
- upsetting the pre-flange portion of the billet to form a flange spaced apart from the hollow skirt portion with a steel core between the flange and the hollow skirt while the hollow skirt retains its shape, thereby forming a piston blank having a near-net shape, wherein the flange is spin-bendable to form a cooling channel without preliminary removal of material from the steel core by machining.
Dependencies are inferred from the claim text.