Process for producing large-sized rectangular or square steel pi

Details Process for producing large-sized rectangular or square steel pi Process for producing large-sized rectangular or square steel pi

1979-06-13

1982-01-12

Rubinson, Gene Z.

Electric heating

Metal heating

Of cylinders

219 591, 219 612, 228151, 228 175, 72 52, B23K 3106

Patent

active

043107400

ABSTRACT:
A process for producing large-sized steel pipe of rectangular or square configuration from a single plate includes providing a predetermined length of steel plate. The plate is bent to form a longitudinally extending base, opposed sidewalls and a top wall. The top wall is constituted by inwardly directed extensions of the sidewalls which terminate in spaced apart longitudinally extending edges. The sidewalls are angularly disposed relative to the base. At least one inner roller having outwardly facing substantially planar surfaces is positioned within the bent plate upon the base thereof. Outer rollers are positioned externally of the bent plate so as to be cooperable with the underside of the base and with the sidewalls. Relative longitudinal movement between the rollers and the bent plate is effected, the outer sidewall rollers are pressed against the planar surfaces of the inner rollers, and the longitudinally extending edges are brought into substantially abutting relationship. The steel plate, configured into the desired shape, is then welded.

REFERENCES:
patent: 3263053 (1966-07-01), Rudd
patent: 3337944 (1967-08-01), Morris
patent: 3603761 (1971-09-01), Wogerbauer
patent: 3640116 (1972-02-01), Hellman
patent: 4083221 (1978-04-01), Whitted
patent: 4099662 (1978-07-01), Nakajima
patent: 4142663 (1979-03-01), Blatnik et al.

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