Title:
【発明の名称】管状材の端部にフランジを形成する方法及びその装置
Document Type and Number:
Japanese Patent JP2692870
Kind Code:
B2
Abstract:
Forming a flanged end on a tubular workpiece, using a die (14) having a throat (16) with an abutment surface (16c) extending transversely on each side of the throat. The workpiece (11) is positioned to extend through the throat with one end of the workpiece extending adjacent the abutment surface. A transversely expandable mandrel (18) is inserted in collapsed condition in the end of the workpiece. The mandrel has a pair of laterally separable cheek pieces (18) each movable to a position overlying a respective abutment surface (16c), and a wedge member (21) reacting between the cheek pieces (18) to separate them laterally. The wedge member (21) is extended to separate the cheek pieces (18) and expand the side wall (12b) of the workpiece (11) transversely outwardly to overlie the abutment surfaces (16c). The cheek pieces (18) are then driven together in the expanded condition longitudinally inwardly to coin a portion (12c) of each expanded side wall (12) between an end face of each cheek piece (18a) and a respective abutment surface (16c), and thereby provide a flanged portion (12e) on each side of the workpiece.
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Inventors:
Ivano G. Cudini
Application Number:
JP17384988A
Publication Date:
December 17, 1997
Filing Date:
July 14, 1988
Export Citation:
Assignee:
TA I Corporate Services Limited
International Classes:
B21D39/20; B21D19/08; B21D41/02; (IPC1-7): B21D19/08
Domestic Patent References:
| JP63115911A | ||||
| JP59190417U | ||||
| JP6024423U |
Attorney, Agent or Firm:
Takehiko Suzue (3 outside)