| Project/Area Number |
09450272
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
YAMAGUCHI Katsuhiko Faculty of Engineering and Design, Kyoto Institute of Technology Professor, 工芸学部, 教授 (90027805)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAKURA Norio Faculty of Engineering and Design, Kyoto Institute of Technology Associate Professor, 工芸学部, 助教授 (40163183)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Sheet metal forming / Deep drawing / Deep cup / New forming process / Joining / 板材成型 / 塑性加工 / 機械的接合 / 加工限界 / 深絞り |
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| Research Abstract |
In order to produce a deep cup by conventional deep drawing of sheet metal, redrawing and/or ironing in one or more stages are necessary as the subsequent operation after the deep drawing. When such multi-stage forming is applied to the small lot production of very deep cups, tool cost becomes relatively expensive as the number of product decreases. And also, the lead time to the production can not be shortened.
To facilitate the small lot production of very deep cups, in this study, a new forming process combined with joining process has been developed. A developed blank, the periphery of which is cut just like petals, was used instead of a conventional circular blank. This makes it possible to reduce the drawing resistance at the flange portion of the blank. By the aid of this effect, very deep cylindrical, square and tapered cups were easily produced in one drawing operation. However, there exist seams at the side wall of the cup produced and how to join the seams is a problem. To join the seams, mechanical seaming methods such as inlaid metalwork and folding or curling were adopted, and deep drawing and joining of seams at the side wall of the cup was carried out simultaneously. The effect of shapes of blank holder and developed blank on deformation behavior of joining portions was mainly examined and suitable working conditions were clarified. It is also confirmed that the sheet metal forming process combined with joining process can be used as a method to facilitate small lot production of very deep cups.
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