SU1507468A1 - Stand of rolls - Google Patents

Abstract

The invention relates to the processing of metals by pressure using special shaped rolls and is intended for use in the ferrous metallurgy, as well as in industries that have rolling and roll forming rolls. The purpose of the invention is to increase the reliability and speed of protecting the rolls from breakage and drive assemblies from overload. Supplying the stand with an additional hydraulic cylinder 22 connected by nozzles 20, 21 to the power cylinders 15, 16 allows reliably and quickly directly from the additional cylinder to transfer force to the pistons of the power cylinders associated with the pillows 11, 12 of one of the rolls to press these pillows to fixed to the beds stops 17, 18. Installation on the piston 23 of the additional hydraulic cylinder 22 of the load 24 creates a specific pressure of the working fluid of the required size in the cavity of the additional hydraulic cylinder, in the pipes 20, 21, connect hitting him with power cylinders 13, 14, to press the pillows 11, 12 with plungers against the stops 17, 18 on the beds with a force equal to the maximum allowable force on the rolls for this stand. 3 il.

Description

3. 1507

The invention relates to the processing of metals by pressure using a valkon of a special form and is intended for use in the ferrous metallurgy, as well as in industries that have rolling or roll forming rolls.

The purpose of the invention is to increase the reliability and speed of safety of rolls from breakage and drive units against overload.

FIG. 1 shows the cage of the proposed design, the general view; in fig. 2 - crate, side view; Fig., 3a cut of the power cylinder. i The mill cage consists of beds 1,2, in which clamps 3 and 4 are placed the pressure screws 5 and 6 of the upper roll 7 connected to its cushions 8 and 9. The lower BELOW roll 10 with its tips 11 and 12 rests on power plungers 13 and 14 hydraulic cylinders 15 and 16. On the beds above the lower roll cushions, two pairs of stops 17 and 18 are rigidly fixed. The working cavities of the power cylinders are interconnected by a pipe 19, and the pipes 20 and 21 are connected to an additional hydraulic cylinder 22, on the piston 23 of which load goods 24. Cylindrical Surfaces of plungers 13 priti Coy accurately secured to contacting them with the inner cylindrical surfaces of the cylinders 25 that the IS-

Includes the need for sealing elements to reduce the reliability of high-pressure chambers.

The reserve cavity 26, located below the cylindrical surface 25 of the power cylinder, has an ordinary cleanness of free-size surface treatment and serves to connect the pipeline and the nozzle. Similarly

the power cylinder with plunger SKON-

an additional i-idrocylinder with a piston is also structured.

The cage works as follows.

With a filled system (power cylinders 15, 16, pipeline 19, nozzles 20, 21, and an additional hydraulic cylinder 22) working fluid and a load 24 of a pillow 11, 12 on the piston 23: cushion roll 10 by pistons 13, 14 of the power cylinders 15, 16 are pressed against the stops 17, 18.

The load 24 presses on the piston 23 of the additional hydraulic cylinder 22, the piston on the working fluid and creates a certain value of the maximum pressure in the system; the resultants of which on Sh1u sharah create efforts to clamp the roll to the stops. In this case, the plungers of the power cylinders with the pressure of the fluid are in the upper position, rigidly pressing the cushion against the stops. In this case, the stops serve as a restriction on the movement of the lower roll towards the upper and plungers - a rigid support, which receives the forming force developed on the rolls. To adjust the cage by rotating the pressure screws 5.6 in the covers 3.4, the pads 8.9 are moved in the guide beds 1, 2 and the necessary radial clearance is established between the upper 7 and lower 10 rollers. After that, the cage is ready to go. In the optimal mode of forming profiles, when the metal pressure on the rolls does not exceed the maximum permissible value, the cage works like the cages of the existing structures. In the case of a cage overload under the action of a force, which is the difference between the forming force and the pressing force of the lower to the stops, the lower roll cushions will release the associated plungers which will drop in the power cylinders by a certain amount, and the radial clearance in the roll caliber will increase by this magnitude. Increasing the gap between the rolls will reduce the forming force to a value not exceeding the critical allowable for this cage. " This will continue until the cage overload is eliminated. Lowering the plungers in the power cylinders will squeeze out a certain amount of fluid from the latter, which through the nozzles 20 and 21 will enter the additional hydraulic cylinder 22 and lift the piston 23 together with the load 24.

After removing the overload of the bottom roll, the lower roll again presses the plunger stops with a force equal to the difference between the calculated pressing force, equal to the critically allowable roll force for this stand, and the actual value of the roll forming force at the moment, due to the fact that the piston is loaded it will sink a little and displace a certain amount of liquid from the additional cylinder, which will flow through the pipes into the power cylinders and lift the plungers. With the pressing of pillows to the stops, the lower roll will lift5150

from (move) to the upper roll and - zymet cBde starting position.

Connecting the power cylinders to each other by means of a pipeline contributes to the complete synchronism of the operation of the plungers in both our 1indrars.

The simplicity of the device, due to the absence of multi-staggeredness and the multisHHOCTK system for protecting the nodes of the stand from overload, provides it with high reliability.

And direct and short links in the line (overload source - protection from it) provides fast protection and return the rolls to their original working position. For the source of the overload itself, which exceeds the maximum permissible force, spreads the rolls and thereby eliminates its action, i.e. emergency situation. The cage overload protection works as a balanced two-arm lever: on one side, a swath with an applied forming force, and on the other, a load of a calibrated weight value. And the working fluid between them is a lever that relieves dynamic loads.

The proposed stand is quite

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O

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five

neck in the manufacture, installation and maintenance of the safety device.

It should also be noted that when using the described stands, the technological capabilities are expanded by limiting the forming effort in any mill stand to the required (less allowable by design) amount of effort for the technological process, by appropriate selection (calculation) of the mass of the load on the piston of the additional hydraulic cylinder. This condition is necessary, for example, when profiling sheet material from non-ferrous metals or with various types of coatings with easily deformable surface, etc.

The cage can be realized on any creature of a lean mill by reconstructing its stand or on a newly designed mill using the stands of the proposed type. This will make it possible to reduce the number of stops for repairs, increase the mill's productivity and reduce the costs of redistribution by reducing the cost of repairing the nodes of the stands, and expand the technological capabilities of product development,

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efficient, its use due to the production of which requires regulation to improve the reliability and speed of protection of rolls from breakdowns, residual deflections of shafts of rolls and drive assemblies from overloads. For example, the experiments performed on the profile-bending mill 1-6x30-730 showed the advantage of this stand over the known ones, both in terms of reliability and speed of protection of the stand against overload.

Through the use of this stand, the overloads that cause it are eliminated. idle time for the repair of cage assemblies and the material costs of replacing the failed components and parts. This increases the productivity of the equipment and reduces the cost per ton of bent profiles.

In addition, the cage has not only more reliable, but also more simple, and therefore less expensive 40

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Claims (1)

to force efforts in cages. Invention Formula A rolling mill cage containing beds, work rolls mounted on pillows, pressure mechanisms and connected hydraulic cylinders whose plungers interact with the pillows of one of the rolls, which in order to increase the reliability and speed of the rolls from damage and drive assemblies against overloads, the stand is equipped with an additional hydraulic cylinder connected to the hydraulic cylinders with a calibrated weight mounted on its piston and stops mounted on the frame restraining the movement of preloaded gi Drotsilindra-1mi pillows. the production of which requires regulations to force efforts in cages. Invention Formula A rolling mill cage containing beds, work rolls mounted on pillows, pressure mechanisms and connected hydraulic cylinders whose plungers interact with the pillows of one of the rolls, which in order to increase the reliability and speed of the rolls from damage and drive assemblies against overloads, the stand is equipped with an additional hydraulic cylinder connected to the hydraulic cylinders with a calibrated weight mounted on its piston and stops mounted on the frame restraining the movement of preloaded gi Drotsilindra-1mi pillows. Editor A, Dolinich Fm.z Compiled by G. Rostov Tehred I. Veres Order 5489/13 Circulation 459 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, 113535, Moscow, K-35, Raushsk nab. Corrector I. Muska Subscription