Piston and method of manufacture
First Claim
1. A method of making a piston, comprising:
- preparing a first portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another,preparing a second portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another;
supporting the first and second piston portions with the joining surfaces of the first portion being positioned out of contact with the joining surfaces of the second portion;
heating the joining surfaces of the first and second portions to an elevated bonding temperature and thereafter bringing the joining surfaces of the first and second portions into contact with one another and thereby forming a metallurgical bond therebetween, wherein the joining surfaces lie in different planes.
21 Assignments
0 Petitions
Accused Products
Abstract
A piston particularly adapted for heavy-duty diesel engine applications is fabricated from separate parts having circumferentially extending joining surfaces that are heated prior to bonding to an elevated temperature sufficient to enable bonding of the joining surfaces, and thereafter the joining surfaces brought into contact with one another and twisted to attain a permanent metallurgical weld at the interface of the joining surfaces. The piston has radially spaced walls which are both welded simultaneously. The weld joints may lie in the same or different planes. Once joined, and while still hot, the parts may be pulled apart slightly to reduce the wall thicknesses at the weld joint.
54 Citations
30 Claims
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1. A method of making a piston, comprising:
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preparing a first portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another, preparing a second portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another; supporting the first and second piston portions with the joining surfaces of the first portion being positioned out of contact with the joining surfaces of the second portion; heating the joining surfaces of the first and second portions to an elevated bonding temperature and thereafter bringing the joining surfaces of the first and second portions into contact with one another and thereby forming a metallurgical bond therebetween, wherein the joining surfaces lie in different planes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of fabricating a piston comprising:
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fabricating a first piston portion having at least one associated mating surface; fabricating a second piston portion separately from the first piston portion having at least one associated mating surface; spacing the mating surface of the first piston portion from the mating surface of the second piston portion; with the mating surfaces spaced, heating the surfaces to a temperature sufficient for welding of the surfaces; bringing the heated mating surfaces into contact with one another to weld the piston portions across the joined mating surfaces, and, while the joined mating surfaces are still hot, pulling the piston portions axially away from one another to reduce the thickness of the mating surfaces. - View Dependent Claims (28, 29, 30)
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Specification