FIELD: metal working; cold working of metals by plastic deformation. SUBSTANCE: hole in blank is made cylindrical, with diameter somewhat larger then or equal to large diameter of required conical hole. Then mandrel is fitted in hole. Shape of mandrel is made to shape of required conical hole in part and cone is formed by reducing the blank over outer surface until the blank comes in contact with surface of mandrel after which mandrel is taken out. EFFECT: improved quality of machining. 2 dwg
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