Extrusion die and manufacturing method of same

Metal tools and implements – making – Blank or process – Die

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219 69M, B23P 1524, B23H 706

Patent

active

047366567

ABSTRACT:
An extrusion die having on the front surface thereof a bearing opening of the shape of a given section; a bearing surface corresponding to the section of the bearing opening formed over a length from the front surface to the rear surface of the die; and a draft formed from the bearing surface toward the rear surface; the bearing surface at each position on the inner circumferential line of the bearing opening being formed in such a fashion as to have a bearing length which is substantially determined in accordance with the shape of the bearing opening at that position wherein, when viewed with respect to a sectional face orthogonal to the inner circumferential line, a straight line corresponding to the bearing surface and a straight line corresponding to the draft intersect at a depth position substantially equal to or larger than the bearing length at that position, and the depth position where the intersection point exists is in a depth position which is substantially determined in accordance with the shape of the bearing opening at the respective positions on the inner circumferential line of the bearing opening, and a method of making the same.

REFERENCES:
patent: 2341749 (1944-02-01), Webb
patent: 2559523 (1951-07-01), Templin
patent: 4036043 (1977-07-01), Yamaguchi et al.
"Metallkunde", vol. 58, No. 4, 1967, pp. 215-217.
"Werkstatt und Betrieb" 108, 1975, pp. 499-505.

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