RU1817718C - Mill for profiling non-equal flange channel sections - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to equipment for the production of high-quality bent sections. SUMMARY OF THE INVENTION: a mill comprises stands with rolls mounted with clearance S, including a finishing stand with a gauge inclined at an angle a to the horizontal, vertical rollers mounted with a clearance, and flying shears. It is characterized in that in front of the scissors additional rollers with cylindrical surfaces are installed with a minimum clearance di, while the rollers after the finishing stand are made with conical surfaces, the generators of which are inclined to the horizontal at an angle a, and are installed with a minimum clearance of 62, and the gaps are equal : 5i (1.6-1.7) .S and d2 (1., 0) .S. The main problem solved by the invention is to reduce labor costs and increase the quality of bent unequal channels. 2 ill. ate

Description

The invention relates to equipment for the processing of metals by pressure and can be used in the production of high-quality bent sections.

The purpose of the invention is to reduce labor costs and improve the quality of bent unequal channels.

To solve this problem, a roll forming mill containing stands with rolls installed with a clearance S, including a finishing stand with a caliber inclined at an angle a to the horizontal, vertical rollers installed with a clearance, and flying shears, are installed in front of the last with with a minimum clearance of 5 e, additional rollers with cylindrical surfaces, while the rollers after the finishing stand are made with conical surfaces, the generators of which are inclined to the horizontal at an angle r7, and are installed with a minimum clearance & gaps are: 5i (1,6-1,7) S and (, 8-2,0) 5.

The essence of the claimed technical solution is that before cutting the finished profile into measured lengths with flying scissors, it is rotated with the help of additional vertical rollers to a position in which the channel shelves are perpendicular to the horizontal. At the same time, duplication of the slope of the profile in the finishing gauge (using rollers with conical surfaces) is used, which prevents rapid wear of this caliber. In this case, the minimum clearance between the rollers of both pairs is adopted depending on the roll gap of the forming stands (it is equal to the nominal thickness of the profile).

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The vertical rollers of the proposed mill are installed with a certain distance between their axes in each pair, i.e. with a predetermined distance between their working surfaces (or a gap), depending on the configuration of the cross section of the profile and its thickness. As can be seen from FIG. 2, the size of the gap of the rollers varies from the maximum, its value A to the minimum d. The experiments showed (see below) that the value of d should be slightly greater than S, otherwise the edge of the large channel shelf is jammed by the rollers, which leads to the phenomenon of undulation. If q is too large, the angle of 90 ° between the large shelf and the channel wall is not fulfilled due to the application of torsion moments in the opposite direction from the vertical rollers behind the finishing stand and in front of the scissors to the strip in section AB (see Fig. 1), which worsens the cutting of large channel shelves. An experimental verification of the claimed technical solution was carried out on a roll-forming mill 1-4x50-300 of the Magnitogorsk Iron and Steel Works during molding of uneven-shelf channels 50x48x15x3 and 50x40x12x2.5 mm in seven cages. For this purpose, after the VII forming mill stand, vertical rollers with conical working surfaces and with a different angle of their inclination to the horizontal were installed, and rollers with cylindrical surfaces in front of the flying scissors. In the course of the experiments, the values of the minimum clearances of the rollers q varied. On a mill made according to the proposed technical solution, 35-42% of channels corresponded to high accuracy (VT) profiling (according to GOST 8281-80) and 5-9% to ordinary (OT) accuracy (the rest is increased (PT) accuracy), Change the angle of inclination of the conical surfaces of the rollers behind the VII stand (compared with the value a of the fine gauge) led to a decrease in the yield of VT channels due to an increase in the value of their longitudinal twisting (the norm is according to clause 11. TOST 8381-80). The increase in (5i and & i (from the optimal values: (5i (1.6-1.7) S and, 8-2.0) 5 caused a deviation from the angle of 90 ° more than the tolerance (+1 deg, for BT profiles) and in some cases, the crushing of the large channel shelf .With a decrease in the values of 5i and 62 on the large shelf of channels formed from the end (thickened) sections of the roll billet, increased (more than 2 mm per 1 m length) waviness was observed. control profiling on the prototype mill of the same channels, the scissors were located behind the VI forming

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stand so that the cut is carried out with the horizontal position of the profile wall, i.e. when the small shelf is upright. In this case, to eliminate the end defects of the profiles (dump - camber of shelves) formed after cutting to measured lengths, it was necessary to add another stand, which increased labor costs. The output of VT channels did not exceed 32%. Thus, the experiments confirmed the acceptability of the technical solution found to achieve the goal and its advantages over the prototype object.

In FIG. 1 schematically shows the proposed mill; in FIG. 2 - vertical rollers in front of the flying scissors (a) and behind the finishing stand of the mill (b).

The mill (see Fig. 1) contains forming stands 1 with rolls installed with a clearance S, a finishing stand 2 with a caliber inclined at an angle a to the horizontal, vertical rollers 3 behind each stand and flying scissors 4 in front of which additional vertical rollers 5 are mounted with cylindrical surfaces 6 (see Fig. 2). The maximum clearance of the rollers 5 - AI, is equal to the width of the profile, and the minimum 5i (1.6-1.7) S (Fig. 2A). The rollers 7 behind the stand 2 are made with conical surfaces 8, the maximum gap between which is Aa Ai, and the minimum is 52 (1.8-2.0) 3, i.e. dg d. The angle of inclination of the surfaces 8 to the horizontal - a. The formed profile 9 leaves the finishing stand 2 at an angle a to the horizontal and in the same position leaves the vertical rollers 7. When the profile enters the rollers 5, its cross section rotates (in our case, counterclockwise), assuming a vertical position, when a 90 °, i.e. In the section AB of the mill, a torsional force acts on the strip, which necessitates the creation of gaps 22 of optimal value. At a given level of profiling, the xx profile is fixed by the flanges of 10 vertical rollers. A slightly larger value of dg (as compared to 5h) is necessary to compensate for inaccuracies in the installation of vertical rollers 7 and 5 relative to the longitudinal axis of the mill, and the value of d should be as small as possible to ensure a high-quality cut of a large channel flange.

Example 1. The mill for profiling unequal channel channel 50x48x15x3 m made with a gap between the rollers mm with the angle of inclination of the fine gauge and the conical surfaces of the vertical rollers

after this caliber a 81 °. In front of the flying scissors, additional rollers with cylindrical surfaces (a 90 °) are installed. Values of roller clearances: At mm,, 6, 5 1, .8 mm, (,, 4 mm.

Example 2. A similar mill, but (,,, 1 mm and, 0 mm.

Example 3. The same mill, but (,, 65x3 5.0 mm and ,, 7 mm.

The technical and economic efficiency of the claimed object in comparison with the prototype consists in reducing labor costs for profiling and improving the quality of unequal channels.

Claims (1)

SUMMARY OF THE INVENTION A mill for profiling unequal channels, comprising cells with rolls mounted with clearance S, including including a finishing stand with a gauge inclined at a horizontal angle to the horizontal, vertical rollers installed with a clearance, and flying scissors, characterized in that front scissors are installed with a minimum clearance (5i additional rollers with cylindrical surfaces, while the rollers after the finishing stand are made with conical surfaces, the generators of which are inclined to the horizontal under 5 by angle a and are set with a minimum gap of 62, and the gap values are 5H1.6 ... 1.7) S and & (1.8 ... 2.0) S. Figure 1