SU933137A1 - Stand with multiroll pass for longitudinal rolling - Google Patents

Description

(50 CHARACTERS WITH MULTI-ROLL CALIBER FOR LONG-TERM ROLLING

one

The invention relates to the processing of metals by pressure and can be used in the process of longitudinal rolling of tubes on mandrel mills.

The stand of the mill for longitudinal rolling of tubes with a multi-roll caliber is known, comprising a stand and bodies with double-support calibrated rollers 1.

A disadvantage of the known design of a mill stand with a multi-roll caliber is the laborious handling of rolls, due to the need to completely disassemble the stand, as well as the difficulty of fine-tuning the gauge.

The closest in technical essence to that proposed from among the known is a cage with a multi-roll-gauge for longitudinal rolling, including a stand, several work rolls carrying their rotary bodies, made up of

two halves, driven cylindrical gears, arranged in pairs on the same axis with each roll on opposite sides, interacting with them driving cylindrical gears, the shafts of which are installed in the frame and are the axes of rotation of the bodies, mechanisms of rotation of the buildings and conical pairs according to the number of work rolls, connecting adjacent

10 pivot points

A disadvantage of the known design of a multi-roll mill stand is the inability to change the diameter of the workers.

15 rolls, which limits the amount of single deformation, depending on the conditions of metal capture by the rolls, and hence the narrow pipe mix. water axles drive work rolls

20 per line connecting the axles of the drive shafts leads to a significant decrease in the stiffness of the roll angle due to the occurrence of a bending moment from the normal rolling force acting on the work roll support and causes wearyness of the geometric dimensions of the pipes.

The aim of the invention is to expand the range of rolled tubes by allowing the installation of rolls of different diameters.

The goal is achieved by creating a cage with a multi-roll gauge for longitudinal rolling, including a frame, several work rolls, rotary bodies carrying them composed of two halves, driven gears arranged in pairs on one axis with each roll on opposite sides, and interacting with them drive cylindrical gears, the shafts of which are installed in the frame and are the axes of rotation of the bodies, mechanisms of rotation of the bodies and conical pairs according to the number of rolls connecting the adjacent axes of rotation to Orpus, in which both halves of the body of each roll have pivot axes, which are located coaxially and each carries a leading cylindrical gear and a tapered wheel of a conical pair, separate rotation mechanisms in the form of a screw pair with a hinged nut in the frame with the help of a nut and placed with a gap forming an open space in the plane of rotation of the roll.

Such a stand allows the installation of rolls of both small and large diameters and thereby selects the optimal rolling conditions for different tubes.

FIG. t depicts a four-roll cage, general view; in FIG. 2, section A — L in FIG. one; in fig. 3B-B in FIG. 2; figure 4 is a diagram of the installation of the rolls of the largest and smallest diameters.

The rolling stand with multi-roll gauge contains frame 1, drive work rolls 2, carrier rolls swivel bodies composed of two rug 3 and A, driven cylindrical gears 5, driving cylindrical gears 6, shafts 7 of which are installed in the frame and are the axes of rotation of the buildings

rotation mechanisms of the housings in the form of screw 8 and nut 9 pivotally mounted in the frame; bevel wheels 10 and 11.

The mill stand of longitudinal rolling with multi-wheel caliber works as follows.

The tube stock is fed into a gauge formed by drive work rolls 2 located in frame 1 where the workpiece is deformed in diameter and wall thickness. The torque is applied to the work rolls by means of bevel gears YUI 11, seated on the drive shafts 1 connected to the work rolls by spur gears 5 and 6. The drive motor shaft is connected to one of the horizontally located drive shafts. If it is necessary to change the range of rolled tubes, in order to maintain a given degree of deformation and accuracy of geometric dimensions, this is ensured by maintaining the conditions of metal capture by the working rolls and the rigidity of the roller assembly when the centers of the work rolls 2 are removed beyond the lines connecting the drive shaft centers. work rolls upwards, i.e. to dump new work rolls with a large rolling radius into a multi-roll stand. Increasing the diameter of the work rolls while maintaining the desired degree of deformation, i.e. while maintaining a predetermined gap between the work rolls, is compensated by bringing the centers of the work rolls out of the line connecting the centers of the drive shafts. The work rolls are withdrawn by rolling them along the pitch circumference of the driving cylindrical gears 6 by rotating the screw 8 of the case rotation mechanism.

Example. The stand of the longitudinal rolling mill with four-roll caliber consists of a solid-cast bed 1 with overall dimensions IOOx1bOO mm.

The diameters of the driven working roll 2, which can be tumbled into the cage, can vary from 120 mm to 600 mm, which, in its turn, provides a sufficient amount of 5

Accelerating conditions for metal capture by working rolls in the entire range of variation of the range of rolled pipes, both in outer diameter (100 + 20 mm) and in wall thickness (20-5 mm).

The pipe billet is preheated to a temperature of 12001250 ° C and fed to the inlet chute of the inlet side of the multi-roll stand of the longitudinal rolling mill. When rolling a billet with an outer diameter of 60 mm and a wall thickness of 10 mm with a degree of deformation in one pass equal to 30, we obtain a pipe with an outer diameter of 42 mm (in the process of straightening, we assume that the wall thickness does not change). The diameter of the driven work rolls is chosen to be 500 mm to ensure stable conditions for the gripping of the metal of the pipe by the work rolls.

The basic object of the adopted mill stand for longitudinal rolling with four-roll caliber, working at the Izhevsk Mechanical Plant and intended for rolling small-section profiles.

The disadvantage of this stand design is the inability to roll a wide range of products due to the limited dimensions of the diameter of the rolls and the inability to install the rolls of different diameters.

The work rolls used, with a diameter of 180 mm, when cutting a round caliber, allow the pipe to be rolled with a maximum outer diameter MO with a pull-through 1.2-1.25. While maintaining the previous stretch, in the case of rolling tubes with a large outer diameter (up to 100 mm), it is necessary to increase the diameter of the work rolls to 600 mm to provide gripping conditions, which is associated with the use of a stand along the base valve with the need to manufacture a new stand with working rolls with a diameter of 600 mm.

376

Taking into account that the cost of manufacturing a new stand with large-diameter work rolls amounts to 1,520 thousand rubles. The use of the proposed stand under the conditions of the UralNITI pilot plant for the production of pipes of a wider sormate will amount to approximately 60 thousand rubles a year.

Claims (2)

1. Anisiforov V.P. and others. Reduction mills. M., Metallurgists, 1971, with. 16Y73. 2. USSR Author's Certificate No. 371991, cl. B 21 B 13/10, 1971 (prototype). Фа24 L / Have / /