FIELD: machine building.
SUBSTANCE: invention relates to machine building and can be used for shaping of smooth holes in sheet billets by plastic deformation with temperature action from friction forces. Tool comprises shank, working stage, safety and working truncated cones. Working stage is made in the form of serially and coaxially located first working stage and second working stage interconnected by working truncated cone. First working stage is connected by working truncated cone with said safety truncated cone, diameter of which is determined from reduced relationship.
EFFECT: providing a constant axial force acting on the sheet workpiece, avoiding deformation of the workpiece in the form of a deflection of the sheet around the hole.
1 cl, 1 ex, 3 dwg
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