SU850234A1 - Method of cold rolling of strips on the single-stand mill - Google Patents

Description

I

This invention relates to plate rolling technology.

There is a method of rolling cold-rolled strips on a single-mill mill in several passes with successive winding of a strip on winders. The well-known method of rolling on single-stand mills is used, as a rule, for rolling special grades of steel with a small output of finished products, as a result of which the implementation of continuous rolling on multi-stand mills. is disadvantageous. In addition, the need for reversible rolling also arises when continuous rolling on a multi-mill mill does not allow for the implementation of a given reduction mode. From this point of view, reverse rolling is economically due to p1 "

The disadvantage of the known method of reverse rolling is low productivity in comparison with

In addition, due to the need to feed the front and rear ends of the strip into the winder, these ends do not roll and remain thickened with gangs, which reduces the yield of metal from each roll. The disadvantages of this method include the lack of continuity and unidirectionality of the rolling process, which creates certain

1c difficult to automate such mills. In addition, a change in the direction of rolling affects the physicomechanical properties of the rolled metal (for example, electrical steel, alpine, etc.

The purpose of the invention is to increase the productivity of a single-mill mill, the yield of metal yield

20, ensuring continuity and one-directionality of the process, creating conditions for more complete automation, as well as for improving the physical and mechanical characteristics of the rolled metal.

This goal is achieved by the fact that in the method of rolling the strips on a single mill in several passes with subsequent rolling of the strip. into a roll, rolled strip, passed between the rollers, closed in a ring, connecting its front and rear ends, for example, by welding, then rolling a closed strip in one direction, bringing the rollers closer each time after the complete passage of the ring, to the final size, causing the annular strip to be separated and directed to winding.

FIG. 1 shows a device that implements the proposed 1 «| th method; figure 2 is a graph of the rolling speeds of the reversible rolling method; on fig.Z - rolling speeds of the proposed method.

The main technological equipment includes rolling mill 1, loop stitch 2, scissors 3 cross-cutting strips, winder A, decoiler 5, device 6 for joining strips, loop loop 7, pulling rollers 8.

The device works in the following way.

The first roll mounted on the unwinder 5 fills drive 7 and then feeds the front end of the strip into the rolling stand. The front end of the first lane, which has come out of the class, is connected in a device for connecting lanes with a non-rolled rear section of the same lane. Since the lanes of different thicknesses are connected, this section of the strip is rolled in such a way that due to the specified movement of the screws, with appropriate compensation of the NANNIN oscillations and the rolling speed, a smooth transition is provided from one thickness to another at the joints lanes. For the strip thus lifted up, they are t (1-fold) times in one direction. At the beginning of the nth passage, when the front end of the strip, coming out of the cage, reaches scissors -3, the filling of the loopback device begins. At this time, the place where the front strip cogda is connected to the rear one is cut out and the upper end is tucked into the winder 4 and the first strip starts winding.

(accumulated in the loopback accumulator 2. The rear end of the first strip is fed at this time to the device 6 for connecting the strips, where it is connected to the front end of the second (next) strip mounted on the uncoiler 5. Thereafter, the second strip fills the loop accumulator 7. When the junction of the first and second strips reaches the scissors 3, the filling of the loop accumulator 2 begins. At this time, the junction of the rear end of the first band and the front end of the second is cut and its front end is connected to the still unrolled end. Next, the entire rolling process is repeated first. The first strip is rolled at all working speeds, except for the first one, at all speeds, and all the passes are rolled at all speeds. FIG. 2 time to refuel strip

winder acceleration time from filling speed to working time at operating speed m slowing down from working speed to filling tu ....; rolling time at filling speed t., time spent on reversing tpgg. Since the rolling speed during refueling, acceleration and deceleration of a lower operating speed, the rolling cycle of the proposed method is significantly shortened compared to the known one, since the rolling of all lanes in all passes is conducted only at operating speed. This significantly improves the productivity of the mill compared with the reversing method of rolling. The absence of the need for consistent refueling of the strip in the right and left winders with each pass increases the yield of metal due to unrolled front and rear kosh. In addition, the continuity and unidirectionality of the process of rolling the strips according to the proposed method contributes to the most complete automation of the process, as well as the production of a metal with dull meziko-mechanical properties.

Claims (1)

Invention Formula The method of pit rolling strips on one-mill mill for several passes, followed by winding strip on a roll, which is distinguished by the fact that, in order to increase the mill productivity, increase the yield of metal, enable automation, the rolled strip passed between the rollers is closed in the form of a ring, connecting its front and rear ends, preferably g,:. welding, then rolled a closed strip in one direction. each time the rollers come together after the ring has completely passed, to the final size, after which the annular strip is separated and directed to the winding. Sources of information taken into account in the examination I. Polukhin PI and others. Rolling production. M., Metallurgizdat, 11960, p.367, fig.270. , tfi./