SU1013006A1 - Method of reversive rolling of strips - Google Patents

Abstract

METHOD OF ROYVE1 SIVYY OF ROLLING OF STRIPS including the change in thickness along the length of the strip in K ee1dm npbiijtcrke, except for the latter, by reducing the p acTBopa of the rolls in the process. : rolling on tl and h a lo.tni and and. c% so that, in order to reduce the JtHHdmichesky loads on the drive of your mechanism in .moment of its E. ausk, the change in thickness along the length of the strip during the rolling process in the kddym.pro; the start-up, the crawling of the last one, p | 3 F -

Description

The invention relates to the rolling of metals and alloys and can be used in the rolling of strips on reversing rolling mills. A known method of reversible rolling of strips involves the insulating of the front end of the strip before each 1 T pass. A disadvantage of the known method is the use of special ancillary equipment for stopping and spending time on this operation. The closest to the invention in technical essence and the achieved result is a method of reversible rolling of strips, which consists in changing the shape of the strip with each pass, except for the first, during the rolling process in the previous pass, by bringing the rolls closer during the exit of the rear end of the strip from the deformation zone, at the same time, in the process of each pass, when the back end of the -band reaches a certain length, they turn on the screwdriver and uniformly bring the rolls together until the gap between them becomes such that the thickness of the rear chaets lower end of the floor strip thickness in this pass, the thickness of the floor no.bolshe sy subsequent pass. As a result, the outgoing end of the strip has the shape of a wedge, which reduces the gripping angle in the subsequent pass and reduces the dynamic loads acting on the body at the time of t2 capture. The disadvantage of this method is the need to overcome the dynamic loads acting on the drive mechanism at the moment of solution change rolls in the process of rolling, produced under the conditions of nominal pressure and so on, significant friction forces in the screw pores of the pressure mechanism, often result in high energy consumption. The purpose of the invention is to reduce the dynamic loads on the actuator drive mechanism at the time of its launch. This goal is achieved by the fact that according to the method of reversible rolling of strips, including the change in thickness along the length of the strip in each pass, except the last, by reducing the roll solution during the rolling process, the change in thickness along the length of the strip, during the rolling in each pass. t by reducing the VALKDV solution, starting from the moment the metal is gripped. The drawing shows the shape of the strip after intermediate passing through the rolls. In the rolling process, in each pass, except the last, the screwdriver is turned on immediately after the metal is seized by the rollMy at low initial crimping and evenly drawn together until the gap S between them becomes such that the thickness of the strip is less than the thickness Lc. this pass, but greater than the strip thickness h | (-. in the subsequent pass. Example. The AMg-2 aluminum alloy strip is rolled on a quarto reversing mill with a thickness of 278 mm hg to a final thickness of 45 mm in nine passes. When rolled stripes in each A roll solution S is set in the trap and, during the rolling process, the strip in each pass, except the last, uniformly reduces the gap between the rollers by an amount. The table shows the rolling pattern and the calculated values of the rolling force at the moment the pressure mechanism is turned on

255

15 15 25 25

270,235

° 250

205

230 175

200

375 316 308 292

The table shows that the start of the drive of the pressure mechanism according to the proposed method is carried out with rolling forces on average 1.5-2 times, and at the last passes 3-3, -5 times smaller than by a known method, with the greatest reduction per pass, the arrival at the end of the roll, and the resulting rolling forces do not exceed the loads arising in the continuation table

tea rolling end of roll by a known method.

Low loads on the electric drive of the pressing mechanism at the moment of its launch lead to a reduction in the power consumption and increase in the reliability and durability of the operation of the pressing mechanisms of rolling mills,

Claims (1)

METHOD FOR REVERSIBLE ROLLING OF STRIPS, including changing the thickness along the length of the strip in each residence, except the last, by reducing the roll solution in the process. 'rolling, on the basis of the fact that, in order to reduce dynamic loads on the drive of the pressure mechanism at the time of its start, the thickness is changed along the length of the strip during the rolling process in each.' start-up, in addition to the latter, is carried out by reducing the solution of the rolls, starting from the moment of capture of metal / metal.