Title:
PIERCING MACHINE AND METHOD FOR MANUFACTURING SEAMLESS METALLIC TUBE USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/107418
Kind Code:
A1
Abstract:
Provided is a piercing machine capable of suppressing the temperature difference between a front end section and a rear end section of a hollow element tube following piercing/rolling or stretching/rolling. A piercing machine (10) is provided with: a plurality of inclined rolls (1), a plug (2), a mandrel bar (3), and an outer surface cooling mechanism (400). The outer surface cooling mechanism (400) is disposed behind the plug (2) and around the mandrel bar (3), and cools a hollow element tube (50) within a cooling region (32) by spraying a cooling fluid (CF) onto an upper section, a lower section, a left-side section, and a right-side section of the outer surface of the hollow element tube (50) as viewed in the advancing direction of the hollow element tube (50) advancing within the cooling region (32), which is disposed behind the plug (2) and has a certain length in the axial direction of the mandrel bar (3).
Inventors:
DAIMON YASUHIKO (JP)
SAKAMOTO AKIHIRO (JP)
OBE HARUKA (JP)
SAKAMOTO AKIHIRO (JP)
OBE HARUKA (JP)
Application Number:
PCT/JP2018/043801
Publication Date:
June 06, 2019
Filing Date:
November 28, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21B45/02; B21B19/04
Foreign References:
| US2830921A | 1958-04-15 | |||
| JP2010247218A | 2010-11-04 | |||
| JPS5286911A | 1977-07-20 | |||
| JPS5630001A | 1981-03-26 | |||
| US3782160A | 1974-01-01 | |||
| JPH01109304U | 1989-07-24 | |||
| JPH0399708A | 1991-04-24 | |||
| JP2017013102A | 2017-01-19 |
Other References:
See also references of EP 3718656A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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