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Abstract

A method for coining a precision corner break on an oil metering flat for a rotor of a power steering rotary valve is provided. The method comprises the first step of placing a workpiece to be coined in a first floating position set by a clamping and orientating device where the workpiece is generally aligned but adjustable for further coining orientation if necessary. The next step comprises engaging the workpiece with a plurality of circumferentially spaced coining dies. The workpiece floats from the first floating position to a second coining position upon engagement by the dies. The last step comprises coining the workpiece to a precision depth selectively adjustable by adjustment of a motion conversion means. The press assembly includes fixed and movable platens, the movable platen being powered by a power cylinder assembly to direct the movable platen in a longitudinal direction in the press. The motion conversion means comprises matched angle camming surfaces of the die assembly and a drive block fastened to the fixed platen. As the camming surfaces engage, the longitudinal movement of the movable platen is converted to a radial movement of the dies into the workpiece adjustable by adjustment of the depth position of the die assembly drive block.

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First Claim