SU1301501A1 - Method of operating sized rolling mill rolls after their reconditioning - Google Patents

Abstract

The invention makes it possible to increase the service life of the rolls during their operation after restoration. Before installing the drive rolls in the cage, they are reversed (top to bottom, right to left), which allows changing the direction of rotation of the roll and compensating for the resulting torque the residual torsional stresses of opposite sign obtained from the previous roll campaign. The shifting also allows the use of unworn surfaces of the drive roll end in conjunction with the spindle. Operation rolls start with the caliber, the most distant from the drive rolls. The initial wear of the non-drive bearing from the forces in the middle caliber equals the wear of the drive support and the roller is aligned with the supports, while the effect of vibration on the work of gauges from the idle side is less. 4 il. I (L o ate

Description

one

The invention relates to rolling production and can be applied to continuous billet and small section mills.

The purpose of the invention is to increase the service life of the beams.

Figure 1 shows the scheme of metal rolling in the cage from the side of the non-drive support; figure 2 - section aa in figure 1; on fig.Z and 4 is a diagram of the sequential operation of the calibers of the rolls.

The method is carried out as follows.

The new rolls 1 and 2 of the transshipment mechanism are driven into the cage, placing the first caliber on the side of the non-driving support 3 on the rolling line. Then the stand is adjusted (clearance and position of the strands of the caliber) according to the existing technology and metal rolling 4 is performed. As gauges wear out, a transition to a new gauge is made until the roll is completely worn. At the same time, the material of the roll experiences a bending stress due to bending moments M, and torsions due to torques. The torque is directed towards overcoming the friction forces in the supports and the rolling moment, including the tension from the previous stand, and creates residual torsional stresses directed tangentially to the roll cylinder. Maximum stresses: "" are formed on the surface

NV

But from the drive side, the torsion moment is transmitted through the inadequate gauges, and the worn gauges experience much less stress, the torsion from the moment of friction in the non-driving support 3. After restoring the gauge profile, rolls 1 and 2 are swapped. In this case, the direction of rotation of the rolls changes and the GKR torsional tensions of opposite sign appear in the material of the roll, compensating for the residual stresses from the previous operation.

Swapping the rolls (top to bottom right to left side) allows you to change the direction of rotation of the roll and, at the same time, compensate for the attachment

my torque, the torsional residual stresses of the opposite sign. The shuffling also allows the use of unworn surfaces of the 5th drive roll end in conjunction with the spindle; This reduces the gaps and dynamics in the joints. Stress compensation and clearances increase roll life,

10 since they reduce the likelihood of a roll breaking. The wear of the gauges on the side of the idle support makes it possible to transfer torque over the roll section with unworn gauges, without

15 voltage concentrators.

Worn gauges, except for bending, experience only torsional loads from the moment of friction (M- | .p) in a non-driving support. These tensions are ten times

.0 less torque from the drive bearing 5, which ensures that the roll does not break along worn sections and increases its service life. The initial wear of the non-drive bearing from the forces in the middle gauge is equal to the wear of the drive support and the roller is aligned with the supports. At the same time, vibration is less affected by the work of gauges with an idle

25

thirty

hand, so from the drive side

the support is worn to a lesser extent by the end of the service roll. This is especially noticeable on the bearings,.

The method allows to reduce the cost. 35 you on the production of rolled by

reduction of breakage of rolls and emergency downtime of the mill, as well as improve the quality of rolled products.

Claims (1)

40 claims A method of operating the calibrated rolling rolls after their restoration, including the installation of 45 upper and lower drive rolls in the stands with a successive rolling transition in gauges as they wear out, characterized in that, in order to increase their service life 50, the rolls before installation in the stand is reversed, and operation begins with the caliber furthest from the drive rolls. / f- / 1 g  Kp Cr. 2 ig.1 (rig ch Editor M.Blanar Compiled by M. Blatov Tehred M. Khodanych Order 1176/9 Circulation 481 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader A.Zimokosov