FIELD: plastic material working. SUBSTANCE: tool has a cone portion with through slit, inclined by angle 10-15 degrees relative to an axis of the tool. A cutting edge is formed on one of walls, restricting the slit of the cone portion. The cutting edge has a leading angle 20-30 degrees. Upon working the tool is smoothly cutting-in to the part, being worked, by its cutting edge for providing uniform deformation of the material. EFFECT: enhanced quality of hole surfaces. 1 cl, 2 dwg
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