SU858955A1 - Continuous rolling mill - Google Patents

Description

(54) CONTINUOUS ROLLING MILL

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The invention relates to rolling production and can be used primarily in continuous mills.

A continuous rolling mill for rolling a strip with partial coverage of rolls, comprising at least two successive stands and installed in a housing with the possibility of vertical movement in the interstand gap, an additional work roll p 3 is known. The disadvantage of the known mill is the inability to adjust the rolls during the rolling process. This is due to the fact that the strip is crimped between the main and an additional work roll installed in the interspace. The structure of the mill is designed in such a way that the regulation of strip reduction is carried out by vertical movement of the work roll x.

and the deformation zone is offset from the vertical axis by a certain angle. As a result, the resulting horizontal pressure components lead to significant horizontal movements of the work rolls and, consequently, to a change in the desired reduction. Thus, the adjustment of the mill must be carried out before filling the strip into the mill, which requires a considerable amount of time and leads to a decrease in the productivity of the mill. In addition, as a result of these events, the tension mode is practically unregulated.

15

The purpose of the invention is to reduce energy consumption at the deforming unit by adjusting the angle of the rolls and, thus, the tension conditions of the strip.

The goal is achieved

20 in that in a continuous rolling mill for rolling a strip with partial roll coverage, including at least two successively arranged stands and installed in a housing with the possibility of vertical movement in the inter-hive gap an additional work roll, the housing of the additional work roll is made in a separate stand, and the same stand installed second work roll.

The drawing shows a diagram of the mill.

The rolling mill consists of a series of consecutive rolling stands 1, 2 and 3, including roller units. The movement of the roller nodes in the vertical plane in each stand is carried out by means of pressure devices.

Moving the roller unit installed in the additional stand ensures the possibility of adjusting the tension mode over a wide range, since it creates the possibility of adjusting the angle of the rolls enveloping the strip. When this occurs, by changing the contact area of the rolled metal with the surface of the work rolls, the friction forces in these zones are effectively controlled. The friction forces prevent the metal from rolling on the rolls, providing a smooth transition from stresses in the gaps between the spaces to the zone of maximum deformations and reduce the effect of hard ends. Thus, the regulation of the contact of the metal leads to the appearance of additional active friction forces, providing the possibility of increasing tension, and a change in the angle of coverage - to their regulation during the rolling process.

Rolling mill works as follows.

After refueling the lanes in cages 1, 2 and 3 in the spaces between the spaces

stans create tension. In this case, the tension control is carried out both by the speed of rotation of the rolls and by the position of the roller knots. The strip moves along a path that can be conventionally described by a sinusoidal function, including the lower rolls of the odd stands and the upper rolls of the even stands. Contact length

rolls with a strip determines the magnitude of the extra-focal strain of the strip and therefore can be used as a regulatory factor affecting product quality. With the passage

tackle with high flatness

the roller unit of stand 2 can be lifted, and with a lower flatness omitted.

Claims (1)

1. USSR author's certificate number 577055, cl. B 21 B 1/24, 1976.