Metal deforming – By extruding through orifice – Expressing non-uniform cross-section or non-linear product
Reexamination Certificate
2005-08-30
2008-07-22
Banks, Derris H. (Department: 3725)
Metal deforming
By extruding through orifice
Expressing non-uniform cross-section or non-linear product
C072S467000, C072S253100
Reexamination Certificate
active
07401486
ABSTRACT:
A die through hole has an inside surface including a bell portion, an approach portion, and a bearing portion from the entrance side. The diameter of the approach portion is D1on its entrance side and D2on its exit side and gradually decreases from the entrance side to the exit side. The diameter satisfies Equation (1): 0.7≦D2/D1<0.97. The die half angle of an inside surface where the diameter D3is D2/0.97 is not less than the die half angle R2of an inside surface nearer to the approach portion exit side than the inside surface where the diameter is D3. The axial distance LR from the inside surface where the diameter is D3to the inside surface where the diameter is D2satisfies Equation (2): 20≦LR/((D3−D2)/2)≦115. The through hole diameter at the bearing portion is fixed at D2, and the length is LB and satisfies Equation (3): 0.3≦LB/D2≦10.
REFERENCES:
patent: 6449997 (2002-09-01), Bertolini
patent: 52-035629 (1977-09-01), None
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patent: 2002-011518 (2002-01-01), None
Akiyama Masayoshi
Kuroda Koichi
Okui Tatsuya
Banks Derris H.
Clark & Brody
Sumitomo Metal Industries Ltd.
Wolfe Debra M
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