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The method of forming an annular piston with a central hub, a radial pressure face and an outer cylindrical flange having an outwardly opening annular seal receiving groove which comprises the steps of forming an annular sheet metal stamping having an axial hub portion, an annular radial pressure fa

The method of forming an annular piston with a central hub, a radial pressure face and an outer cylindrical flange having an outwardly opening annular seal receiving groove which comprises the steps of forming an annular sheet metal stamping having an axial hub portion, an annular radial pressure face and an axial cylindrical flange with an annular free end portion; rotating the stamping while radially and axially supporting the hub; radially inwardly rolling and permanently deforming the flange into U-shape while simultaneously axially compressing and bending the free end portion radially inward throughout 360°. The method further includes upon the stamping an axial hub portion terminating in a radial inwardly directed first flange; radially and axially supporting the hub portion adjacent its opposite ends while rotating the stamping; radially and axially supporting the first flange; radially inwardly rolling and permanently deforming part of the hub portion into an internal second flange axially spaced from the first flange while simultaneously axially compressing the hub portion relative to the first flange, the flanges defining an internal annular seal receiving groove.

대표청구항 ▼

A method of forming an annular piston having a central hub portion, a radial pressure face and an outer cylindrical flange having an outwardly opening annular seal receiving groove comprising the steps: (a) forming an annular sheet metal stamping having a central axis, a generally cylindrical centra

A method of forming an annular piston having a central hub portion, a radial pressure face and an outer cylindrical flange having an outwardly opening annular seal receiving groove comprising the steps: (a) forming an annular sheet metal stamping having a central axis, a generally cylindrical central hub portion, a radially extending portion having a radial pressure face, and an axial cylindrical flange having an annular free end portion with a transition portion of reduced thickness located between said flange and said pressure face; (b) rotating the stamping about its axis while radially and axially supporting said hub portion; (c) journaling an annular forming first roller of convex shape upon an axis parallel to said stamping axis; (d) progressively feeding said first roller transversely into said flange while simultaneously axially compressing and permanently bending the free end portion radially outward to form a radially, inwardly concave groove; (e) replacing said first roller with an annular forming second roller of generally rectangular shape; (f) progressively feeding said second roller transversely into said flange while further compressing the free end portion to form said groove into generally U-shape and to partially fold said transition portion; (g) successively replacing said second roller with an annular forming third roller of final rectangular shape; and (h) progressively feeding said third roller into said flange to further fold said transition portion into a folded over portion and to form a partially flattened outer surface of said transition portion.