Title:
METHOD FOR FORMING PROJECTING SHAFT ON PLATE
Document Type and Number:
Japanese Patent JP3957410
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase the height of a shaft part compared with the thickness of a plate, or to increase the thickness of the shaft part.
SOLUTION: In a method for integratedly forming a projecting shaft 2 with the height larger than the thickness of a plate 1 by the plastic deformation on one surface of the plate 1, comprising a first pressing process in which one surface of the plate 1 is pressed by a pressing tool 10 to form a hole 4 on one surface and a projecting part 5 on the other surface, a flashing process to shift a wall thickness of a part pressed inward of the hole and to further project the projecting part 5 by pressing a circumference of the hole 4 by a columnar flashing tool 12 whose outside diameter is larger than the outside diameter of the projecting part 5, and a second pressing process to form a projecting shaft 2 by adding the height to the projecting part 5 by inserting the pressing tool 10 in the hole 4 to effect the pressing, a wall thickness shifting process to collect the wall thickness around an opening of the hole 4 by a tapered tool 11 having an approximately conical tapered surface 11a and move it inward of the hole 4 is added after the first pressing process, and the forming is effected by increasing the shift of the wall thickness to the projecting shaft 4.
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Inventors:
Hideyuki Miyahara
Application Number:
JP24105798A
Publication Date:
August 15, 2007
Filing Date:
August 12, 1998
Export Citation:
Assignee:
Nakamura Manufacturing Co., Ltd.
International Classes:
B21D22/04; B21D19/08; B21D28/24; (IPC1-7): B21D22/04; B21D19/08; B21D28/24
Domestic Patent References:
| JP6026737B2 | ||||
| JP7100546A |