SU1579603A1 - Method of producing closed welded roll-formed sections with corrugated on side walls - Google Patents

Abstract

The invention relates to the pressure treatment of sheet material in rolls of a roll forming mill and is intended for use in the manufacture of closed welded curved rolled sections in ferrous metallurgy. The purpose of the invention is to improve the quality of the profiles by increasing the accuracy of the geometric dimensions. At the first transitions on the workpiece, the corrugations are formed, which then shift the profile outwards. The areas adjacent to the corrugations are temporarily tilted relative to their initial plane. The corrugations are formed by the width of the base larger than the width specified for the profile that was set on the cooker and the overall width of the side walls. After welding the edges of the profile, the corrugations are shifted to the plane of the side wall, reducing the width of its base to a predetermined while maintaining the width of the side wall. The method makes it possible to qualitatively shape the junctions of the side walls with the walls and shelves. 1 hp f-ly, 2 ill., 2 tab.

Description

The invention relates to the processing of metals by sheet metal forming in rolls of a roll mill, and is intended for use in the manufacture of closed welded curved rolled sections in ferrous metallurgy.

The purpose of the invention is to improve the quality of the profiles by increasing the accuracy of the geometric dimensions.

FIG. 1 shows a scheme for forming a closed welded profile with corrugations on the side walls; in fig. 2 — node I in FIG. one.

In the manufacture of a closed welded profile with corrugations on the side walls of the steel billet 1 after the master stand (transition 1) in the transition II, the corrugations 2 are molded 2. In the transition III, the corrugations 2 on the side

the walls 3 move the profile out of the sidewall plane 0-0, while the peripheral portions of the side walls 3 adjacent to the corrugations 2 are temporarily tilted relative to their original plane 0-0. The displacement of the corrugations 2 from the 0-0 plane of the side wall to the outside of the profile allows, in the future, to ensure, when the profile is finalized, its shape and size are given. The temporary inclination of the peripheral sections of the side walls 3 adjacent to the corrugations 2 relative to their initial 0-0 plane allows, in the correct-calibration stand group (XI-XIII), to form qualitatively the places of the bend between the side walls 3, wall 4 and the shelves 5 and, accordingly, the angles between the profile elements.

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ABOUT

The corrugations 2 in junction III are made with a base width br greater than a given bz, with given width of the sweep Pr and overall width Wb of the side walls 3.

The execution of the corrugations 2 with the base width Lg more than the specified bzad allows tilting 5 sections of the side walls 3 adjacent to the wall 4 and the shelves for a given sweep width Pg and the overall width of the Wb. Side walls, which later on when forming the profile (transitions XI- XIII) to the required shape and size allows the profile side walls to be bent at a given angle due to the displacement and additional shaping of the corrugation 2.

The implementation of side walls 3 of a given overall width of Wb Art in VX junctions allowed later (junctions XI-XIII) to use 6 places of interface between shelves 5 and side walls 3 and 7, walls 4 and side walls 3 as supporting surfaces when the corrugations 2 return plane, awn 0-0 side walls 3, which ensures the achievement of a given shape and height of the profile, additional shaping of the corrugation with the implementation of a given shape and size. In addition, the implementation of the side walls 3 of a given width Wbst in transitions III-V reduces the maximum height of the molding, which reduces the velocity difference in the caliber of the rolls. After the last transitions XI-XIII, after welding the edges 8, the corrugations 2 are displaced to the 0-0 wall plane, and at the same time it is formed, reducing the width of its base Lg to the given Lzd while maintaining the width Wb of the side wall. This contributes to the creation of the required magnitude and direction of compressive forces, sufficient for shaping the junctions 7 of the wall 4 with the side walls 3 and the shelves 5 with the side walls 3 into a predetermined curvature, and to achieve a given shape of the profiles,

At the same time, the inclination of the side walls 3 at an angle y, equal to 5-20 ° relative to their initial plane 0-0, makes it possible to obtain a profile with parallel edges before welding (transition) X), which ensures the required quality of the weld.

As shown by the results of an experimental verification of the method of manufacturing closed welded profiles with corrugations on the side walls, a noticeable effect is not observed when the side walls 3 are inclined with respect to their initial 0-0 plane through an angle of less than 5 °, since passing through the welding cage (transition X) profile edges lose their stability and there is a deflection of welded shelves inside the profile.

At an angle of inclination of 5–20 °, the required shape of the profile takes place along the entire length, and with a further increase in the angle of inclination it increases unnecessarily

the number of technological transitions and energy consumption for molding.

The results are presented in table. 1. The proposed method can be implemented when forming profiles in

rolls of roll forming mill and does not require special devices for its implementation. According to the technology developed on the basis of it, on the bending mill 1-4 ... 50-450 they made a closed welded

profile with corrugations on the side walls 100x80x3 mm.

The profile was molded in a continuous way according to the regime given in table. 2

To obtain 1 and the finished profile according to the proposed method, it took 12 technological transitions before welding, and three correct-calibration stands after welding. Workpiece width 353 mm.

The inclination of the side walls to their initial plane was chosen as 8 ° from the condition of parallelism of the welded edges.

In the manufactured profiles, the internal radius of bending of the interfaces of the wall and

the side walls did not exceed RB 3.1 mm with Nzad 3 mm of the side walls and shelves RB 3 mm, Yazad 3 mm, the angle of the bending of the side walls / 3 90-30 °, the shelf a 90 + 30 °, the height of the Vstb profile 100 ± 1 mm for a given

Vst 100 mm, the wall width of the Vst profile is 80 ± 1 mm, for a given VSt. 80 mm, which is within the limits of tolerances according to GOST.

According to calculated data and experienced

The test on mill 1-4 .., 50-450 method of making closed welded curved profiles with corrugations on the side walls provides for an improvement in the quality of the profiles: the bending radius of the interface points

5 and side walls on the finished profiles x did not exceed 3 mm (RBH 3 mm for a given R 3 mm), the radius of the junction points of the side walls and shelves1 did not exceed 3 mm (RBH 3 mm for a given R3ad 3 mm), the bending angle

0 side walls 90–30 ° and shelf bending angle 90 + 30 °, profile height ° 100 ± 1 mm for a given value of mm, width of a profile for rst 80 ± 1 mm for a given width of posterior width 80 mm.

five

Claims (2)

1. A method of manufacturing closed welded curved profiles with corrugations on the side walls by successively shaping sheet blanks in rolls of a roll-forming mill, in which trapezoidal corrugations with a base width larger than specified are formed at the first transitions, then the side walls of the profile are bent in intermediate transitions, then longitudinal are welded edges with the receipt of a closed contour and complete the profile to the final configuration, reducing the width of the bases of the corrugations to on the side walls, characterized in that, in order to improve the quality of the profiles by increasing the accuracy of the geometrical five In the first transitions, the trapezoidal corrugations shift the profile outwards, the a-sections adjacent to the corrugations are temporarily tilted relative to the initial plane, the corrugations being molded with a predetermined width of their sweep, the side walls at intermediate transitions perform a given overall width, and during the last transitions, when the profile is formed, the corrugations are displaced to the plane of their walls while maintaining the width of the latter. 2. A method according to claim 1, characterized in that the sections of the side walls of the profile adjacent to the corrugations are inclined by an angle of 5-20 °. Table 1 I transition table 2 fTTTi G 1 Fig2