Plug for cold drawing and method for manufacturing of metal...

Details Plug for cold drawing and method for manufacturing of metal... Plug for cold drawing and method for manufacturing of metal...

2010-01-21

2011-12-13

Tolan, Edward (Department: 3725)

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

C072S370010, C072S370020

Reexamination Certificate

active

08074482

ABSTRACT:
A plug1includes a first columnar portion20, a tapered portion30, and a second columnar portion40. The first columnar portion20has an outside diameter D1. The second columnar portion40has an outside diameter D2which is larger than the outside diameter D1. The tapered portion30is formed between the first columnar portion20and the second columnar portion40. The tapered portion30has a tapered surface31provided with an outside diameter which is gradually increased from the first columnar portion20to the second columnar portion40, and an axial direction length L. The outside diameters D1and D2, and the axial direction length L meet the following expressions (1) to (4):in-line-formulae description="In-line Formulae" end="lead"?0.25≦ρ≦2.00  (1),in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.06≦L/D2≦0.8  (2),in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?L/D2≦0.3×ρ+0.575  (3), andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?L/D2≧0.1×ρ  (4)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?where ρ=(D2−D1)/D1×100.in-line-formulae description="In-line Formulae" end="tail"?Therefore, the cold drawing plug according to the present invention can reduce the tensile residual stress on the outer surface of a metal pipe after the cold drawing.

REFERENCES:
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patent: 6029714 (2000-02-01), Imamura et al.
patent: 7788957 (2010-09-01), Okui et al.
patent: 2006/0218985 (2006-10-01), Kenmochi et al.
patent: 02-197313 (1990-08-01), None
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International Search Report in corresponding PCT/JP2008/063788 dated Aug. 26, 2008.

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