Spinning method
AssigneeHonda Motor Co., Ltd.
InventorsTsunenari Futagi, Nobuyuki Kakiya, Tadahisa Akiyama, Ikuo Kato, Akitoshi Uchiumi, Shinichi Ohnaka, Toshimasa Koshimizu, Haruo Machida, Yuji Matsumoto
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Abstract
A workpiece having a first constant diameter portion, a tapered reduced-diameter portion, a concave portion, a tapered increased-diameter portion, and a second constant diameter portion is formed by machining the tapered reduced-diameter portion, and then machining the tapered increased-diameter portion and the concave portion.
Claims4
A spinning method for forming a concave portion dented in a radial direction of a cylindrical workpiece by pressing a spinning tool against a side wall portion of the cylindrical workpiece, the method comprising the steps of:
- a) attaching the workpiece to a die, the die including a first equal diameter portion having a constant diameter, a second equal diameter portion having a constant diameter and located away from the first equal diameter portion, a first inclined portion continuous with the first equal diameter portion, a second inclined portion continuous with the second equal diameter portion, a small diameter portion interposed between the first inclined portion and second inclined portion and having a constant diameter, and a workpiece movement preventing portion for preventing a movement of the workpiece from the first inclined portion toward the second inclined portion, the first inclined portion being reduced in diameter in a tapered manner as the first inclined portion goes away from the first equal diameter portion, the second inclined portion being increased in diameter in a tapered manner as the second inclined portion comes close to the second equal diameter portion;
- b) pressing the spinning tool to a region of the workpiece corresponding to the first inclined portion, and displacing the spinning tool from the first inclined portion toward the second inclined portion, thereby forming the region into a shape conforming to a shape of the first inclined portion;
- c) pressing the spinning tool to a region of the workpiece corresponding to the second inclined portion, and displacing the spinning tool from the second inclined portion toward the first inclined portion, thereby forming the region into a shape conforming to a shape of the second inclined portion;
- d) pressing the spinning tool to a region of the workpiece corresponding to the small diameter portion, and displacing the spinning tool, thereby forming the region into a shape conforming to that of the small diameter portion, and performing ironing on a thickness of the region by the spinning tool so that the thickness of the region is drawn;
- performing the step b) before the step c) and the step d);
- and
- forming, on the workpiece, a first constant diameter portion conforming to the first equal diameter portion;
- a tapered reduced-diameter portion having a shape conforming to that of the first inclined portion;
- a concave portion having a shape conforming to that of the small diameter portion;
- a tapered increased-diameter portion having a shape conforming to that of the second inclined portion;
- and a second constant diameter portion conforming to the second equal diameter portion.
Dependencies are inferred from the claim text.