Importance

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Abstract

A method and machine for providing six point star shaped blanks of magnetic material which are then used to form a claw shaped alternator pole piece rotor member is disclosed. Magnetic material flat plate stock is flame cut into a zigzag strip and then individual hexagon shaped blanks are stamped out of the zigzag strip. While the hexagon blanks are contained between fixed parallel flat plates to insure predetermined thickness, six chisel point shaped tools are used to simultaneously laterally contact and cold form notched portions in each of the straight sides of the hexagon blank. Subsequently, while the notched blank is contained between parallel flat plates, six rounded point shaped tools simultaneously laterally contact the formed notched portions and cold form the blank into a desired six point star shape. The notching and forming are preferably accomplished by a machine which may comprise separate notching and forming work stations. After the star shaped blank is formed, a press is used to cold form the star shaped blank into an alternator pole piece claw having a main body with the star shaped projections bent by the press such that they project away from the main body in the same general direction. The press also at this time forms a center hole in the alternator pole piece claw main body.

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First Claim