Piston and method of manufacture
First Claim
Patent Images
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.
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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.
26 Citations
39 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. - 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; and
bringing the heated mating surfaces into contact with one another to weld the piston portions across the joined mating surfaces. - View Dependent Claims (28)
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29. A piston, comprising:
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an upper piston portion having mating surfaces;
a lower piston portion having mating surfaces; and
an induction weld joint uniting said mating surfaces. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification