GB791401A - A continuous rolling mill and improved hot rolling process for the production of trapezoidal cross-section strip - Google Patents

Abstract

791,401. Rolling. COMPAGNIE GENERALE DU DURALUMIN & DU CUIVRE. Nov. 12, 1954 [Nov. 13, 1953], No. 32870/54. Class 83 (4). In a method of continuous rolling of trapezoidal cross-section bar S4, Fig. 1b, from rectangular bar M as for making commutators, guides 1, Fig. 1a, are used to constrain the bar on the entry side to the first pair of rolls and maintain the bar straight. The bar M is first rolled to the section S2 between vertical rolls 2 and then between rolls 3 having their axes inclined to the horizontal. The guide 1 on the side of the larger base of the trapezoid has a projection 15 which extends between the rolls 3. In a third stage, rolls 4 reduce the section still further and are so arranged that the bar is elongated equally across the section, and therefore remains straight. To obtain this result the points of intersection 13, 14 of the extended contact faces of the rolls 3, 4 lie on a line 8 which is parallel to the bar M. The speed of the successive rolls may also be controlled to exert a predetermined tension in the bar. A rolling mill suitable for mounting inclined rolls 27, Fig. 2, comprises side frames 21 having arcuate projections 23<SP>1</SP> between which roll supports 24 are rockable about a centre 26 for angular adjustment. Movement of the supports 24 is caused by adjustable thrust members 50 pivoted to a cross member 51 and acting against pneumatic cylinders 53 pivoted on the opposite side of the supports 24. The rolls 27 are mounted on shafts 28 in bearing members 29 which are carried by screwdowns 36 in the supports 24. Pass adjustment is obtained by operating an electric motor 38 which drives screw-down nuts 40 through shafts 39. The rolls 27 are driven through universally jointed shafts 33. Guides 56, 57 are mounted on the entry side of the rolls.