Importance

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Abstract

A method and an apparatus for forging crank throws comprising upsetting a portion of a bar and directing the flowing material to form a preformed part having at the ends of the upset portion two upsets (27a) situated eccentrically to the axis of the bar. To form the ready forging a bending force is applied against the central portion of the preformed part, between the two eccentrical upsets (27a). The bending force is perpendicular to the upsetting force and is opposite to the crests of the eccentrical upsets. During forging operation the bar is fastened between segment dies (20,21) mounted in upper and lower die holders (7,18). The lower die holders (7) are supported by artitulated links (5,11) pivotably mounted to a fixed base. On this base a bending tool (23) is mounted. The upper die holders are slidably mounted to a head, which is fixed to a press ram. To the head an anvil (25) is fastened. This anvil has two working faces, which are interchangeable during the crank throw forging process.

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First Claim