Method of making a piston bottom
AssigneeBerchem & Schaberg GmbH
InventorRutger Berchem
Life of this patent
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Abstract
A piston bottom for large capacity internal-combustion engines is made by forging a saucer-shaped blank from refractory-forging steel and then in a second forging step transforming the saucer-shaped blank into a cup configuration with a planar rim of the blank being transformed into a cylindrical shoulder and an annular bulge of the blank being transformed into an annular boss for connecting the piston bottom of the cylindrical body of the piston. The blank has a convexity projecting on one side of the blank opposite that formed with the bulge.
Claims5
A method of making a piston bottom for an internal-combustion engine piston, comprising the steps of:
- forging a saucer-shaped blank from a refractory forging steel with a flat blank rim, a dished recess in said blank on one side thereof, a central convexity projecting into said recess and, on the opposite side of said blank, an annular bulge;
- forging said saucer-shaped blank into a cup configuration whereby said rim is transformed into a cylindrical shoulder extending axially in the direction opposite that in which the convexity projects while shaping said bulge into an annular boss for attachment to a piston body on assembly of said piston;
- and
- subjecting the cup formed in the second forging step to a homogenizing heat treatment.
Dependencies are inferred from the claim text.