EXPANDING MANDREL Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: protrusion with conical surface is made at front end of case 1 of the mandrel. Removable expanding member collet 2 is placed onto the conic surface. Collet 2 is made step-wise, the collet has two parts 3 and 4. There are two annular grooves 6 and 8 onto step 3. One groove is intended for placing packing ring. The other groove is intended for placing clamps 9, which are made onto edge surface of axes 10. Axes 10 are mounted for rotation in axial holes of flange 12, which has to be part of draft 13. Rotary shaft 14 with gear ring 15 is disposed inside central hole of draft 13. Gear ring 15 is intended for interaction with teeth 16, which are cut in cylindrical surface of axes 10. Seal cap 17 is attached to case 1 at its right edge; central hole of the cap is made in form of a cone. Angle α₂ of cone of the surface is made to be equal to angle α₁ of cone of conic surface of protrusion of the case. To move blank 5, which is mounted onto collet 2, draft 13 shifts to the left. Collet 2 moves along conical surface of protrusion of case 1. Lobes of the collet move apart, and blank 5 is fixed. EFFECT: improved efficiency. 3 dwg