Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1989-02-23
1990-10-16
Spruill, Robert L.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
B21D 2220
Patent
active
049626590
ABSTRACT:
The present invention provides a redrawing method which comprises holding a preliminarily drawn cup of a covered metal sheet by an annular holding member inserted in the cup and a redrawing die, and relatively moving the redrawing die and a redrawing punch arranged coaxially with the holding member and redrawing cup, the drawing punch being capable of going into the holding member and coming out from the holding member, so that the redrawing die and redrawing punch are engaged with each other, to form a deep-drawn cup having a diameter smaller than that of the preliminarily drawn cup. This redrawing method is prominently characterized in that the radius of curvature of the operating corner portion of the redrawing die is 1 to 2.9 times as large as the bare sheet thickness of the metal sheet. According to this redrawing method, the thickness is effectively reduced by bending anad elongating of the side wall, and the variation of the thickness between the upper and lower portions of the side wall is eliminated and the thickness is uniformly reduced as a whole.
REFERENCES:
patent: 4412440 (1983-11-01), Phalin et al.
patent: 4425778 (1984-01-01), Franek
patent: 4485663 (1984-12-01), Gold et al.
patent: 4522049 (1985-06-01), Clowes
U. K. Patent Application No. 2,103,134 A, pub. Feb. 16, 1983, Inventor-Thomas Phalin, Classified in Class 72, Sub. 349.
"Design for Drawing Aluminum", Modern Metals, pub. in Oct. 1962; by J. W. Lengbridge; Classified in 72/347.
WO 86/05421, (PCT), pub. Sep. 25, 1986; Inventor: Saunders, W. T.; Classified in Class 72, sub. 349.
Imazu Katsuhiro
Ishinabe Masao
Iwamoto Hisao
Kobayashi Tomomi
Spruill Robert L.
Toyo Seikan Kaisha Ltd.
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