Press-rolling process for producing a metal tubular product

Details Press-rolling process for producing a metal tubular product Press-rolling process for producing a metal tubular product

B - Operations, Transporting

21

B

80/13, 80/52

B21B 17/10 (2006.01) B21B 17/08 (2006.01)

Patent

CA 1190774

ABSTRACT OF THE DISCLOSURE In a press-rolling process for producing a metal tubular product, which comprises a pipe-forming procedure in which a square metal billet is fed into a rolling mill which consists of a pair of pressing rolls which have semi-circular grooves forming circular shape and which is provided with a plug held in the center line of said circular shape, according to the present invention, said press-rolling process is characterized in that a cavity is formed in the center portion of the forward surface of said billet before said pipe-forming procedure, the diameter of said cavity corresponding to 70% or more but less than 100% of the diameter of said plug and the volume of said cavity being equal to or more than the volume of a portion of said plug located in the inserting side of said billet from the vertical plane containing the axial center of the roll in said rolling mill.

375739

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