B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
26/155
B22D 11/12 (2006.01)
Patent
CA 1230218
ABSTRACT OF THE DISCLOSURE A new method of manufacturing a cylindrical billet hav- ing a predetermined length usable as raw material for pro- ducing a pipe is desclosed. This method is practiced by way of the steps of drawing a cast slab from a casting mold on a continuous casting stand, spirally winding or cylin- drically bending it around a rotating mandrel, jointing to- gether both the end faces of the wound or bend cast slab to a cylindrical body and cutting it to the predetermined length. Two or more cast slabs may be used for constitug- ing the cylindrical body. Two rectangular cast slabs may be used as starting material. They are subjected to roll forming and thereafter they are cut to the predetermined length. They are then press worked to form a recess having a semi-circular cross-sectional configuration whereby a cylindrical body is constituted by assembling them in a superimposed relation. Alternatively, a cylindrical body may be constituted by two cast slabs each of which is sub- jected to roll forming over both the outside and inside surfaces, the outside surface being roll formed to the semi- circular cross-sectional configuration by means of a plura- lity of forming rollers while the inside surface being formed with a longitudinally extending recess having the semi-circular cross-sectional configuration by means of a plurality of grooving rollers. Two roll formed cast slabs are united together by means of a pair of concave drum shaped rollers.
441642
Kabushiki Kaisha Kobe Seiko Sho
Riches Mckenzie & Herbert Llp
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