Title:
METHOD AND APPARATUS FOR WELDING PIPE
Document Type and Number:
WIPO Patent Application WO/2017/006499
Kind Code:
A1
Abstract:
The purpose of the present invention is to manufacture a round pipe with an opening diameter of several inches to several tens of inches in a small number of steps (number of processes, number of stands) while suppressing non-steady deformations such as dipping at the front end parts and back end parts of materials that become problematic when sheet materials are used as forming materials. To achieve this, an FP stand (20) is disposed on the downstream side of a line for BD forming of the forming material into an open pipe. The FP stand (20) has a configuration which uses a turning unit (21) for an upper unit and rolls (22, 23) for a lower unit and side units, wherein the turning unit (21) is configured to support, so as to be able to rotate on an endless track, a die train of grooved dies connected to each other endlessly. An SZ stand (40), which is formed from two rolls, up and down, or four rolls, up, down, left, right, is disposed on the downstream side of the FP stand (20), and furthermore, a welding means (50) for outer surface welding or inner surface tack welding of both edge parts of the open pipe is disposed within the line so as to carry out in-line outer surface welding or in-line inner surface tack welding of both edge parts of the open pipe.
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Inventors:
WANG FEIZHOU (JP)
YIN JILONG (JP)
NAKANO TOMOYASU (JP)
MIURA TAKAMITSU (JP)
YIN JILONG (JP)
NAKANO TOMOYASU (JP)
MIURA TAKAMITSU (JP)
Application Number:
PCT/JP2015/086262
Publication Date:
January 12, 2017
Filing Date:
December 25, 2015
Export Citation:
Assignee:
NAKATA MFG CO LTD (JP)
International Classes:
B21D5/10; B21C37/08; B21D5/12; B23K9/025
Domestic Patent References:
| WO2012060116A1 | 2012-05-10 |
Foreign References:
| JP2011050986A | 2011-03-17 | |||
| JP2012223782A | 2012-11-15 | |||
| JP2009208104A | 2009-09-17 |
Attorney, Agent or Firm:
YANAGIDATE Takahiko (JP)
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