SU389851A1 - METHOD FOR ROLLING ON TWO-ROLL REVERSIBLE MILLS OF FACTION PREPARATION - Google Patents

Description

one

There is a known method of rolling I-beams and other profiles having elements in the form of shelves and walls, in which the rectangular section blank is rolled in split blooming calibers, then in open or closed calibers of the mill stand, then the final rolling is carried out in universal beams cage x camp.

When this method is rolled, the range of the mill according to the size of the finished profile is divided into a number of groups, each of which has its own system of calibers of the harvesting stand and the initial billet. Rolling is accompanied by weighting of poorly deformed profile elements, such as beam shelves, which are movable and non-deformable in this caliber, which makes it necessary to choose the dimensions of the original billet with a considerable excess relative to the dimensions of the finished profile.

The proposed method is characterized in that from a shaped blank obtained, for example, from a continuous casting plant or from a blooming mill, a profile is formed close to the finished one, rolling elements such as shelves and walls in the transverse direction along their entire length in a two-roll reversing mill the protrusions on the rolls making reversing-swinging movements, with the successive displacement of the workpiece along the length for rolling the next section.

Rolling elements with difficult access to the rolls, such as shelves, are performed between the rollers and an intermediate plate, which may be integral.

Transverse rolling of profile elements excludes weaving of undeformable it.

elements, which allows to obtain profiles of increasing sizes in comparison with the initial billet, reduces the number of sizes of the original billet, ensuring the complete assortment of the mill. The latter is especially important for the combined work of the UNRS with a beam mill.

FIG. 1 and 2 illustrate a rolling stand for illustrating the method. Rolling Mill Contains Flat Rolls

- / with protrusions 2; roll cheeks mounted in the supports 3, pressure screws 4 for adjusting the position of the rolls, a device 5 for holding and moving the workpiece on one side of the rolls and the same device

6 on the other side of the rolls, the composite plate 7.

Shaped billet, obtained, for example, with UNRS, after heating in a continuous furnace set between the rollers along

protrusions. Holding devices 5 to 6

press the shelves 8 to vystzpam 2, after which the rolls / begin strictly synchronous movement in the direction pressed to the ledges of the shelves. As the rolls move, the protrusions 2 are inserted into the wall 9 and rolled in the transverse direction along the length of the reduction section until the protrusions come out of contact with the wall. After that, the rolls are stopped. During wall rolling, the holding device 5 alternates with the workpiece in directing the movement of the protrusions, holding the workpiece and not preventing the wall width 9 from increasing. This completes the first half of the cycle.

The second half of the cycle begins with the holding device 6 moving the workpiece in transverse direction against the stop of the shelves 10 into the projections 2, after which the rollers with the projections begin synchronous movement in the opposite direction, rolling the remaining portion of the wall width. During the rolling of the wall in this direction, the restraint device 6 performs the same functions as the device 5 in the first half of the cycle. After the protrusions come out of contact with the wall, the rolls stop and the second half of the cycle ends there. An increase in the wall width, which determines an increase in the height of the finished profile, is proportional to the degree of decrease in its thickness; the shelves here perform the role of rigid ends and are practically not subjected to tightening.

If it is necessary to increase the width of the wall, it is more demanded with the help of pressure screws 4, supported on the pillows 3, to reduce the distance between the rollers 1 by the amount of the required reduction. . The implementation of the method for rolling in the transverse direction of the flanges of the profile, in order to increase their width, is shown in FIG. 2

By means of pushing screws 4, the distance between the rolls of the two-roll stand is increased to such an extent that between them it is possible to install the shaped girder along the projections 2 in the vertical position. Then the wall 9 of the workpiece along the entire length is clamped between the edges of the two half-pieces 7. The thickness and geometry of the edges of the half-pieces are such that they fit tightly

in the space between the shelves 8 and 10 of the workpiece, to form a composite plate, on which the projections 2 of the rolls 1, working in the reversing-swinging mode, roll 5 the shelves 8 and 10 along the width. When the first half-cycle is performed, a portion of the width of the shelves 8 and W is rolled in the transverse direction along the entire length, and when the second half-cycle is carried out with the double ridge 2, the remaining part of the width is rolled in the opposite direction. The clamping half plates 7 with divorced rollers / are made with the help of devices 5 and (shown in Fig. 1) horizontal displacements in the required direction for the length of the reduction section, as well as necessary horizontal displacements during the deformation period. Increasing the width of the shelves 8 and 10 is proportional to the decrease in their thickness.

0 The proposed method allows to vary widely the described techniques for obtaining a given profile with a shelf width and a height larger than the corresponding dimensions of the original piece. Further

5, the obtained draft profile is subjected to intermediate heating in a pass / t; Noah furnace, from where it is transferred to a reversible two-beam beam group and a finishing stand, after successive rolling in which they receive

0 finished beam profile.

Subject invention

Claims (2)

1. A method of rolling on a two-roll reversing mill of a shaped blank having walls and shelves in elements, characterized in that, in order to eliminate less deformable and non-deformable elements, and to obtain from the original 0 of the shaped blank of shaped profiles of increased dimensions, the elements of the shaped blank are rolled in the transverse direction along their entire length by protrusions on the rolls performing reversal-swinging movements, while the blank is sequentially displaced along the length for rolling the next section. 2. The method according to claim 1, characterized in that, for the purpose of rolling elements with difficulty With roll access, the rolling of such elements takes place between the rolls and an intermediate, for example, composite plate.