Metal shaping die assembly

Details Metal shaping die assembly Metal shaping die assembly

1979-05-25

1981-06-02

Mehr, Milton S.

Metal deforming

Tool and/or tool holder

Tool comprising closed periphery deforming passageway

B21C 302

Patent

active

042703808

ABSTRACT:
A die assembly comprises a steel casing shrink-fitted onto and holding a ceramic die nib for extruding, drawing, ironing and the like of ferrous and nonferrous metal stock, especially in hot workable condition. The assembly includes an interlayer between the nib and casing to accommodate imperfect dimensional mating of adjacent shrink-fitted surfaces of the nib and casing. The interlayer is composed of all-crystalline ceramic material having a heating liquidus temperature within the range of 500.degree.-570.degree. C. Rigidity of solidified interlayer maintains uniform shrink-fitted compression on nib during usage of the assembly. Nib and preferred lead-zinc-borate devitrified glass interlayer are easily, jointly removable from casing and leave casing clean for reuse without affecting its case-hardening properties.

REFERENCES:
patent: 2150734 (1939-03-01), Unckel
patent: 2882759 (1959-04-01), Altwicker
patent: 3613433 (1971-10-01), Deverell et al.

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