Title:
二重管の製造方法及び製造装置
Document Type and Number:
Japanese Patent JP6751936
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a technique for efficiently producing a high-quality double tube having sufficient fitting stress by preventing evagination breaking of an inner tube or buckling of an outer tube.SOLUTION: A production method for a double tube comprises previously heat-expanding an outer steel tube 1, relatively layering an inner steel tube 2 into an outer steel tube 1, contacting the inner tube 2 with the inner face of the outer tube by hydraulic tube expansion of the inner tube 2 to integrate, and cooling and contracting the outer tube 1 to fasten the inner tube to fit in the outer tube. In the hydraulic tube expansion of the inner tube 2, an axial tension balance is adjusted by imparting an axial tension in a direction compensating the hydraulic axial tension generating accompanying the hydraulic tube expansion of the inner tube 2 to a slide head 11 slidable in an axial direction while supporting the inner tube 2 by an axial tension compensating cylinder 12.SELECTED DRAWING: Figure 3
Inventors:
Nakasugi
Lee Ping
Yuki Tanaka
Lee Ping
Yuki Tanaka
Application Number:
JP2016132680A
Publication Date:
September 09, 2020
Filing Date:
July 04, 2016
Export Citation:
Assignee:
Kuroki Industry Co., Ltd.
International Classes:
B21D39/04; B21C37/06; B21D39/08; B23P11/02; F16L9/18
Domestic Patent References:
| JP57154336A | ||||
| JP57154337A | ||||
| JP57130790A | ||||
| JP57177838A | ||||
| JP57194832A |
Attorney, Agent or Firm:
Eiwa patent office