Title:
厚肉縁付薄肉筒状製品の成形方法及び装置
Document Type and Number:
Japanese Patent JP4425569
Kind Code:
B2
Abstract:
Method and apparatus for producing a thin walled tubular product with thickened flange. A first stage metalworking (drawing) of a circular plate material A is done by using a first die set 22 having a conical die 24 and a drawing punch 26 is done in a manner that the end of the blank plate is remained on the conical surface 24 - 1 of the die, so that a semi-finished tubular product A 1 with a inclined flange A 1 - 1 is obtained. Then, a second stage metalworking (drawing) of the semi-finished tubular product A 1 is done by a second die set 32 having a shaping punch 34 and a restraint die 36 . The semi-finished tubular product A 1 is held by the restraint die 36 and the shaping punch 34 is introduced into the semi-finished tubular product A 1 for effecting a wall thickness reduction under ironing principle while forming a stepped portion. Simultaneous with the execution of the second stage drawing, a flattening of the flange is done while restriction diameter expansion by a wall 40 , thereby obtaining a thickened flattened flange A 2 - 3.
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Inventors:
Seiji Shiokawa
Application Number:
JP2003163445A
Publication Date:
March 03, 2010
Filing Date:
June 09, 2003
Export Citation:
Assignee:
Koshin Giken Co., Ltd.
International Classes:
B21D22/26; B21D22/02; B21D22/20; B21D28/24; B21D51/18; B21K21/10; B21K23/04
Domestic Patent References:
| JP2002113528A | ||||
| JP8309448A | ||||
| JP1190550A | ||||
| JP11156452A | ||||
| JP20011060A | ||||
| JP62296923A | ||||
| JP6313632A | ||||
| JP63299822A |
Foreign References:
| WO1998015369A1 |
Attorney, Agent or Firm:
Takao Mitsui