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Title:
BEND CORRECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/032070
Kind Code:
A1
Abstract:
Provided is a bend correction method in which a steel pipe having a bend is placed and held in a state in which the bend faces upwards, and the steel pipe is pressed from above at a target load value by a pressing unit to straighten the steel pipe. The method comprises: (a) a step for measuring, during pressing, the bottom dead center load value Pk when the pressing unit is at the bottom dead center; (b) a step for measuring the amount of change Δδ between the bending amount of the steel pipe before pressing in step (a) and the amount of bending of the steel pipe after pressing in step (a); (c) a step for repeating steps (a) and (b) multiple times to generate a relational expression Pk=f(Δδ); and (d) a step for determining the target load value for the next press from the relational expression Pk=f(Δδ).

More Like This:
JPH02241618METHOD FOR STRAIGHTENING BEND OF END PART OF STEEL TUBE
JPS63144823METHOD FOR CONTROLLING STRAIGHTENING PUSH AMOUNT OF OVER-STRAIGHTENING PIPE
JPS5934812[Title of the device] A safeguard of a bend reform press
Inventors:
KURODA KOICHI (JP)
OTAO SHUJI (JP)
Application Number:
PCT/JP2019/030998
Publication Date:
February 13, 2020
Filing Date:
August 06, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D3/10
Foreign References:
JPH02192820A1990-07-30
JPS49130303A1974-12-13
JPS63144822A1988-06-17
JPS63199026A1988-08-17
JPS63199025A1988-08-17
JPH105872A1998-01-13
Other References:
See also references of EP 3834956A4
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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