Title:
【発明の名称】金属管・複合管の受口部製造方法
Document Type and Number:
Japanese Patent JP2940569
Kind Code:
B2
Abstract:
PURPOSE:To prevent or reduce bulge forming rubber from being flawed by using an inner die which can absorb a contraction portion in the lengthwise direction of a tube at the time of expanding the diameter of a tube end part, in the case of manufacturing a socket part in the tube end part of a metallic tube and a composite tube by rubber bulge forming. CONSTITUTION:An inner die 3 having a prescribed tapered face 3a on one end face side is fitted and attached to an opening part 1b of a die 1, a tube end 2b of a steel tube 2 is brought into contact closely with its tapered face 3a, and in its state, bulge forming rubber 4 in the steel tube is compressed in the axial diretion and expanded in the diameter direction, by which a tube end part 2 is subjected to diameter expansion without generating a clearance between the tube end 2b and the inner die 3.
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Inventors:
WATANABE MITSUHIRO
OKUYAMA TETSUHIRO
OKUYAMA TETSUHIRO
Application Number:
JP14028291A
Publication Date:
August 25, 1999
Filing Date:
June 12, 1991
Export Citation:
Assignee:
SEKISUI KAGAKU KOGYO KK
International Classes:
B21D26/033; B21D26/045; B21D26/047; B21D41/02; B29C57/06; B29L23/00; (IPC1-7): B21D41/02; B29C57/06
Domestic Patent References:
| JP55117530A | ||||
| JP6071435U |