FIELD: plastic metal working, mainly extrusion of tubes on rigid shaped mandrel. SUBSTANCE: method comprises steps of deforming blank through die hole onto rigid mandrel; extracting mandrel from extruded portion of blank outside of die; afterpressing remaining portion of blank through die. Apparatus includes container with cone die arranged in its outlet. Blank is pulled through die by means of ram. Mechanism coaxial relative to die, container and rod and designed for axially moving mandrel injects mandrel through die hole. Ram is provided with tip having axial cavity for centering upper end of mandrel relative to die at extrusion. EFFECT: enhanced reliability of apparatus due to elimination of possibility of mandrel damage at removing extruded portion of article from it.
| Title | Year | Author | Number |
|---|---|---|---|
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|
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| DEVICE FOR DETERMINATION OF SHEAR SPECIFIC STRESS | 1993 |
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SU1690941A1 |
