Method of producing a one-part cooling duct piston
AssigneeMahle GmbH
InventorPeter Kemnitz
Life of this patent
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Abstract
The invention concerns a method of producing a one-part piston which, in the region of the piston ring zone, has a closed cooling duct and a recess between the piston ring zone and the box-shaped piston body. The method comprises the following steps: a piston blank is produced by a forging process; the annular recess is produced by machining, the axial height of the recess corresponding at least to the axial height of the cooling duct; the cooling duct, which is open at the bottom, is produced by machining; hub bores are formed and the outer contour of the piston is finished; and the cooling duct, which is open at the bottom, is closed by a two-part cover ring.
Claims6
Method of producing a one-piece piston for an engine from a piston blank, with a closed cooling duct annularly extending in a piston crown at a level of a piston ring band, and with an annular recess between the piston ring band and a box-shaped piston shaft, wherein the piston shaft is connected with piston bosses suspended on the piston crown, characterized by the following steps:
- forging the piston blank (1);
- machining the annular recess (7);
- machining a downwardly open cooling duct (8);
- producing the boss bores (9) and finishing the outer contour of the piston (6);
- closing the downwardly open cooling duct (8) with a cover ring (10).
Dependencies are inferred from the claim text.