Method for producing a piston for an internal combustion engine and piston produced by said method
First Claim
1. A method for producing a piston for an internal combustion engine, comprising the steps of:
- a) producing a first blank of a piston main body via a deformation process, wherein producing the first blank includes forming a contour of a combustion depression outside of a dome region of the piston main body to completion where an excess material deposit is defined in the dome region of the combustion depression, the piston main body including a plurality of piston bosses together defining at least two boss bores, the plurality of piston bosses connected to one another via a running surface, and wherein the combustion depression includes a welding surface facing radially towards an outside with respect to a piston central axis;
b) producing a second blank of a piston ring part via at least one of a deformation process and a casting process, wherein the piston ring part includes a piston crown, an annular fire land and an annular ring section, and wherein the piston crown has a welding surface facing radially towards an inside with respect to the piston central axis;
c) pre-machining the first blank and the second blank, and finish machining the welding surface of the combustion depression and the piston crown;
d) connecting the pre-machined first blank of piston main body and the pre-machined second blank of the piston ring part via a welding process to form a piston body, wherein the piston main body and the piston ring part together define an annular cooling duct; and
e) performing at least one of a secondary machining and a finish machining of the piston body to produce the piston;
wherein step e) further includes removing an amount of the excess material deposit in the dome region of the combustion depression to define a predetermined volume of the combustion depression and inspecting the predetermined volume during the removal of the excess material deposit in the dome region, wherein inspecting the predetermined volume includes determining a lowest point of the combustion depression, and establishing a starting point for a finish machining of the piston crown based on a plane running perpendicularly to the piston central axis and extending through the lowest point.
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Accused Products
Abstract
A method for producing a piston for an internal combustion engine may include the steps of: producing a piston main body from a first blank via a deformation process; producing a piston ring part from a second blank via at least one of a deformation process and a casting process; pre-machining the first blank and the second blank, and finish machining a welding surface of the first blank and a welding surface of the second blank; connecting the pre-machined first blank and the pre-machined second blank via a welding process to form a piston body; and performing at least one of a secondary machining and a finish machining of the piston body to produce the piston.
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Citations
19 Claims
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1. A method for producing a piston for an internal combustion engine, comprising the steps of:
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a) producing a first blank of a piston main body via a deformation process, wherein producing the first blank includes forming a contour of a combustion depression outside of a dome region of the piston main body to completion where an excess material deposit is defined in the dome region of the combustion depression, the piston main body including a plurality of piston bosses together defining at least two boss bores, the plurality of piston bosses connected to one another via a running surface, and wherein the combustion depression includes a welding surface facing radially towards an outside with respect to a piston central axis; b) producing a second blank of a piston ring part via at least one of a deformation process and a casting process, wherein the piston ring part includes a piston crown, an annular fire land and an annular ring section, and wherein the piston crown has a welding surface facing radially towards an inside with respect to the piston central axis; c) pre-machining the first blank and the second blank, and finish machining the welding surface of the combustion depression and the piston crown; d) connecting the pre-machined first blank of piston main body and the pre-machined second blank of the piston ring part via a welding process to form a piston body, wherein the piston main body and the piston ring part together define an annular cooling duct; and e) performing at least one of a secondary machining and a finish machining of the piston body to produce the piston; wherein step e) further includes removing an amount of the excess material deposit in the dome region of the combustion depression to define a predetermined volume of the combustion depression and inspecting the predetermined volume during the removal of the excess material deposit in the dome region, wherein inspecting the predetermined volume includes determining a lowest point of the combustion depression, and establishing a starting point for a finish machining of the piston crown based on a plane running perpendicularly to the piston central axis and extending through the lowest point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19)
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17. A method for producing a piston for an internal combustion engine, comprising:
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a) deforming a first blank of a piston main body including a combustion depression having a dome, a plurality of piston bosses together defining at least two boss bores, a running surface connecting the plurality of piston bosses to one another, wherein the combustion depression has a welding surface facing radially towards an outside with respect to a piston central axis; b) deforming or casting a second blank of a piston ring part including a piston crown, an annular fire land and an annular ring section, wherein the piston crown has a welding surface facing radially towards an inside with respect to the piston central axis; c) pre-machining the first blank and the second blank, and finish machining the welding surface of the combustion depression and of the piston crown; d) connecting the pre-machined first blank of piston main body and the pre-machined second blank of the piston ring part via a welding process to form a piston body, wherein the piston main body and the piston ring part together define an annular cooling duct; and e) performing at least one of a secondary machining and a finish machining of the piston body to produce the piston; wherein step a) includes forming a contour of the combustion depression for the piston outside of a dome region to completion where an excess material deposit is defined in the dome region, and wherein step e) further includes removing an amount of the excess material deposit in the dome region to provide a predetermined volume of the combustion depression without performing at least one of a secondary machining and a finish machining on the contour outside of the dome region.
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Specification