METHOD AND DEVICE FOR PRODUCING METAL PIPE

WIPO Patent Application WO/2022/025272

A1

[Problem] To improve formability in a smart mill capable of achieving desired forming by causing the position of a forming tool disposed in a stand of a pipe mill to be automatically moved to a predetermined position. [Solution] A drive-free breakdown roll BD dedicated to bend forming is disposed on a plurality of stands. Drive-dedicated drive roll DR stands are disposed upstream and downstream of each BD stand. Drive rolls DR are configured to apply a thrust to a center portion of a material using upper and lower flat rolls, and each have a thrust control means and a driving rotation speed control means for applying, by a plurality of stages of drive rolls DR as a whole, and controlling thrust required for passing respective steps. A thrust is applied to the center portion of the material by pressure control using the upper and lower flat rolls in the DR stands, whereby a roll reference diameter is clearly defined, the material is transferred at a constant speed and thrust, and a required thrust can be ensured for various outer diameters and wall thicknesses of products.

NAKANO TOMOYASU (JP)
NISHII MASATO (JP)
SATO TAKEYUKI (JP)
YIN JILONG (JP)
WANG FEIZHOU (JP)
HARUYAMA SHUNICHI (JP)

PCT/JP2021/028412

February 03, 2022

July 30, 2021

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NAKATA MFG CO LTD (JP)

B21D5/12; B21C37/08; G06F30/10

JP2016185560A	2016-10-27
JPH08187516A	1996-07-23
JPH07275954A	1995-10-24
JP2000084619A	2000-03-28
JP2021014863W	2021-04-08
JP4906986B2	2012-03-28

YANAGIDATE Takahiko (JP)

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