FIELD: metallurgy.
SUBSTANCE: invention relates to metal deformation process and can be used for manufacturing of piston pins, allowing taper section of inner surface on each end. For this metal rod is split for rod cylinders. It is implemented punching by extrusion of mentioned detail with formation in it of the first and the second hollows. By means of punching it is received hollow cylinder. Then at each end of this detail it is formed taper section of inner surface by extruding.
EFFECT: consequently it is provided increasing of part-making productivity and reduction in value of received products.
18 cl, 4 dwg
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