SU1079334A1 - Method of producing bent asymmetric sections - Google Patents

Abstract

SGYUSOB MANUFACTURING bended asymmetrical structure by posletsovatelnoy on lane hotsam poogibki raznovelikih asses in rolls of roll forming staia, wherein to both shelves apply equal and oppositely directed bending moments, characterized in that, in order povysh audio quality profiles due predutrezhtseni their helical twisting equality bending moments provide by psiggki on the main shelf technological flanging in the direction opposite to the psgibke this shelf.

Description

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& 0 4: The invention relates to pressure treatment of metapps, in particular, to methods for producing bent asymmetrical profiles in rolls of a roll forming mill. The known method of making bent asymmetrical profiles in the rolls of the bending mill by means of pinging along different edges of different bends, in which, at each perehoc, both poems are applied equal to each other and oppositely directed bending moments due to the bending of the lower shelf along the more intensive regime tl. The disadvantage of this method is the helical twisting of the profiles and, due to the incomplete balancing, bending, from the moments applied to the shelves of the filing ping and bending. The purpose of the invention is to improve the quality of the profiles due to the precision & nn of their helical twisting. This goal is achieved by the fact that according to the method of making bent asymmetrical profiles by successively pacing transitions of different-sized shelves in rolls of bending rolls, equal and oppositely directed bending moments are applied to each roll that is applied to both shelves. , provide by bending on the larger ass technological flanging in the direction opposite to the hem of this shelf. FIG. 1 shows a scheme for forming an unequal channel channel according to the proposed method; in fig. 2 shows the configuration of the flanged profiles and after their removal. In the first transition, the preform 1 is directed along the mill. In the 11-U1 junctions, a greater 2 and a smaller 3 shelves are made with respect to the wall of the 4 profiles. In the transitions, the technological flanging is folded 5. The pitch bend angles for the passage of the larger shelf bc (all transitions are assumed to be the same with the angles of the lower flange bd.) The bend in the same direction opposite the fold of the larger shelf by the angle Y per pass equals the moment difference (M-M). The technological flanging on the larger shelf can be performed as one element or several folded at different angles, as an element of double thickness, technological OT6oj goods can be removed, for example, For example, in the manufacture of an unequal shelf profile 50x40x x15x20x1 mm (4 V 0.9) of StZ steel on a larger butt, a flange width of 2O mm is formed. The shape of the elements of the unequal leg box profile is shown in that face .

Punching in a continuous way on a 1-4x50-300 mill from a roll-55 billet. Before obtaining the finished profile according to the preferred method, 6 technological transitions are required. The helical twist is 1 m long, the longitudinal deflection is 0.6-0.8 mm per 1 m length.

According to the calculated data and experimental testing on the 1-4x50-300 mill, the preapaged method allows, in comparison with the known, to reduce the size distortion of the finished profvp by reducing the helical twisting and buckling in the process of profiling (the helical twisting of the non-uniform curved profile 50x40x15x20x1 mm has 50, 40x15x20x1 mm helical twisting, 50x40x15x20x1 mm, 50 the method was 0 ° ZO per 1 m of cpina, when producing according to the prototype 1 ZONA 1 m long; the longitudinal curvature of the proposed method was up to 0.6-0.8 mm per 1 m length, with production according to p . Ototipu to 1.5 mm per 1 m length); expand the range of complex unequal

bent bent profiles due to the profiles of the sidewalls of the tray, used in electrical installation joints, the production of which was not mastered earlier by those) & nologicheskie difficulties; save the downtime of the mill by reducing the time for adjustment and adjustment by 15-20% (due to the balancing of the moments applied to the bendable shelves); reduce the number of technological transitions by 10%.

The economic effect was obtained due to the organization of production and the use of new unequal curved profiles, along with epegromontazhnyh structures that provide. The metal content is reduced by 2% to 30% and the labor intensity is produced by & n and is 235OOO p.

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Claims (1)

METHOD FOR MANUFACTURING BENT ASYMMETRIC PROFILES by · sequentially bending bendings of different sizes of buttocks in rolls of a roll-forming mill, in which equal and opposite directional bending moments are applied to both buttocks, characterized in that, with a chain for improving the quality of profiles due to cutting, cutting the equality of bending moments is ensured by folding on the larger butt of technological flanging in the direction opposite to the folding of this butt. • (H)