SU1077671A1 - Method of rolling angle sections - Google Patents

Abstract

THE ROLLING METHOD OF ANGULAR PROFILES, Including asymmetric, including formation of angular roll in rough open-ended cutting calibers and adjusting the widths of the roll shelves in them by redistributing the filling gauge metal from the shelf with the usual width to the shelf with an insufficient width, carried out by shifting one of the rolls relative to the other, characterized in that, in order to control the adjustment process, the rolls are displaced one relative to the other by turning the roll with the cutting ridge 2-10 District § vertical axis extending through the top of ridge slab. O -ff

Description

The invention relates to the ferrous and non-ferrous metallurgy industry, in particular, to the field of rolling production and can be used in the production of angular profiles, including asymmetric ones.

A known method of rolling angular profiles, including asymmetric ones, involves forming a rough angular roll in the first open-type cutting gages and adjusting the widths of the rough roll shelves in them by transversely moving the metal from the shelf with an excess width to the side of the shelf with a missing width to perform specified mirin of the finished profile shelves, while adjusting 1 the width of the roughing shelves is carried out by appropriate installation of the inlet and outlet roller reinforcement across the width of the roughing rolls. LIBRA 1J.

The main disadvantage of the known method is that the necessary adjustment of the width of the shelves of the rough corner roll is difficult to provide with the transverse displacement of the lead-in and lead-in rulers, since this causes significant loads on the direction of the ruler and they quickly go out of service, which does not provide stability and high accuracy of rolling angular profiles, especially asymmetric ones.

The closest in technical essence to the proposed is a method of rolling angular profiles, including asymmetric ones, including forcing the angular roll in open-type rough gauges and regulating in them the widths of the roll shelves by redistributing the filling gauge of the metal from the shelf with an excessive width to the shelf with insufficient width, carried out by displacing one of the rolls relative to the other in the axial direction and leveling the thickness of the shelves in the next angular caliber

The disadvantage of this method is the difficulty of adjustment, since the adjustment process is carried out in at least two successive calibers.

The purpose of the invention is to simplify the process of adjusting the widths of the shelves.

The goal is achieved in that according to the method of rolling angular profiles, including asymmetric ones, it includes the formation of an angular roll in open-type rough cutting shorts and regulating in them the widths of the shelves of the roll by redistributing the filling gauge metal from the shelf with an excess width to the shelf with insufficient width, carried out by shift

one of the rolls relative to the other, the rolls are displaced relative to each other by rotation of the roll with the cutting ridge 2 10 around the vertical axis passing through the ridge.

This simplifies the process of adjusting the width of the shelves, since the roll out of the regulating stand with the required width of the shelves and their equal thicknesses.

FIG. Figure 1 shows the first split caliber and its filling with the calculated adjustment of the caliber gaps; figure 2 - split caliber and its filling during rolling in accordance with the proposed method; Fig, 3 - rollers of split caliber installed in accordance with the proposed method, top view; Fig. 4 shows the deformation zone of the first split caliber with crossed roll axes, longitudinal section; figure 5 - the deformation center during rolling on the proposed method, the cross section; in fig. 6-8 are examples of the implementation of the method.

In the process of rolling an asymmetric corner profile in the first split open caliber, the metal of the initial billet 1 is divided over the shelves 2 and 3 of the rough corner bar (figure 1). Then the roughing roll enters the rough, pre-finishing and finishing angular gauges, where the finished profile is finally molded.

If the metal of the original blank 1 is not distributed correctly over the shelves 2 and 3 of the roughing roll and, for example, the left shelf 2 with insufficient width and the right shelf 3 with excessive width in the finished caliber, a finished profile is formed with similar deviations of the width of the shelves, which does not provide the profile required accuracy. Eliminate deviations on the finished profile is possible only with the help of a corresponding redistribution of the metal of the initial billet 1 along the shelves 2 and 3 of the roughing stock.

According to the rolling method, the transverse movement of the metal in the first split caliber (Fig. 2) is performed by rotating the roll 4 with the cutting ridge 5 (Figures 2 and 3) 2-10 around the vertical axis 6 passing through the apex 7 of the ridge 5, while turning roll 4 in the direction of increasing at the entrance to the rolls 4 and 8 of the thickness of the shelf 2 with a shortage of 1 inch and a simultaneous decrease in the thickness of the butt 3 with an excessive width.

With this installation of the rolls 4 and 8, the moment of capture of the workpiece 1 rollers

ridge 5 is shifted to the right (see Fig. 5) by -t relative to the vertical axis. Slip 5 shifted by t when inserted into the workpiece 1 rejects more metal towards the left flange 2 with no width steps. Further, as the metal advances along the deformation zone, the displacement of the cutting ridge 5 gradually decreases and ultimately turns to zero. At the same time, the reduction rate on the left shelf increased, and on the right one it decreased, which additionally increases the left jagging and reduces the right broadening. Thus, the difference in the thickness of the shelves created at the first moment of the entry of the workpiece into the caliber is gradually leveled and the required iiryrins are formed. In the practice of rolling production with an accuracy of 10%, it is always possible to determine the filling of the first discharge caliber. In this case, the upper limit of the crossing of the roll axes at an angle of up to 10 provides for adjustment of the widths of the roughing shelves more than 10%, which always with a guarantee allows correcting the deviations in the filling of the split gauge. When the angles of the roll axes are 0-2 °, the widths of the rolls are adjusted only within 2%, and since the rolling tolerances are usually 1-2% of the section cross-section dimensions, there is no need to use the angles of the crossings less than 2. From this it follows that the angles of rotation of one of the rolls relative to the other are necessary within 2 - Y.

Example. It is given: an open-type cutting angle caliber with a top angle of 90 °, between the left shelf and the horizontal is the DZ, the right shelf and the mech and the horizontal are 60. The thicknesses of the shelves are equal to each other and are 20 mm. When using the original billet 0 70, it is necessary to obtain shelves with a width of 85 and 55 mm in a split caliber, which will provide the required angular profile in the finishing caliber. Rolling is carried out in rolls 0 400 mm.

With the indicated initial data in the split caliber (Fig. 6), shelves of 80 and 60 mm were obtained, that Ha85 || 0.joo ,, g,.,

different from the required values. To obtain the required widths of the shelves, rolling is carried out in accordance with

the proposed method, with the lower roller (Fig. 7) being rotated by an angle of 5 and decreasing the thickness of the right flange at the entrance to the gauge, while simultaneously increasing the thickness of the left flange. When the workpiece is compressed from the bottom roll to 40 mm (Figures 6-8), the length of the deformation zone from the bottom of the lower roll is

MN 4 R- (R-bh) 2 Tl2002- (200-40) 1-120 mm. When the angle of rotation of the lower roll is .5 ° around the axis, the top of the cutting ridge at the entrance to the caliber is shifted to the right (Fig.8) to to sin-yilOwM.

Offset 10 mm to the right, the ridge, when inserted into the workpiece, moves it toward the left shelf.

1/3 of the ridge offset, i.e. by 3.5 mm. Further, as the metal advances along the deformation zone, the thickness of the shelves level off, and due to an increase in the intensity of the reduction along the left shelf, its broadening increases by 1.5 mm, and along the right shelf decreases by 1.5 mm. All this ensures the redistribution of metal along the shelves and obtaining the required width

85 and 55 m: -.

The method compared with the prototype provides a simple and at the same time reliable adjustment of the widths of the rolls of the roll in rough gauges, which is guaranteed to eliminate deviations in the filling of a purely angular gauge and thus. bake the required accuracy of the width of the shelves of the angular profile.

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Claims (1)

METHOD FOR ROLLING ANGULAR PROFILES, including asymmetric, including the formation of an angular roll in draft split open gauges and adjusting the width of the shelves in them by redistributing the metal filling the gauge from a shelf with an excess width to a shelf with insufficient width, carried out by displacing one of the rolls relative to the other, characterized in that, in order to simplify the regulation process _z, the rolls are displaced relative to one another by turning the roll with a cutting ridge 2-10 ° around § the vertical axis passing through the top of the ridge. 129,226 G ~ ns