RU2286220C1 - Working stand for tube cold rolling mill - Google Patents

Abstract

FIELD: tube rolling process; cold rolling of super-thin-walled tubes made from difficultly-deformable materials.

SUBSTANCE: proposed working stand includes movable load-bearing bed frame with bearing beams and movable cassette with deforming rollers mounted in its body; deforming rollers are provided with two trunnions engageable with bearing beams of bed frame. Movable cassette is provided with double-arm levers according to number of deforming rollers; deforming rollers are provided with two additional trunnions on which bearings are mounted; bearings are arranged in arm of double-arm lever in parallel with rolling axis; each double-arm lever is mounted on axle in cassette body for rotation and longitudinal motion over it. Cassette body and second arm of each double-arm lever located in plane perpendicular to rolling axis are connected by means of spring-loaded rod ensuring close contact of trunnions with bearing beams of movable load-bearing bed frame.

EFFECT: improved surfaces of rolled tubes; increased speed due to avoidance of slippage of deforming rollers.

3 dwg

Description

The invention relates to the field of pipe production, and more specifically to equipment for cold rolling of especially thin-walled pipes from hardly deformable materials.

A known design of the working stand (see A.S. No. 113414, class 7a, 1) containing a frame and a movable stand with rolling rollers with pins.

In the known construction, the roller pins are in contact with several support rollers transmitting the rolling load to the bed.

A disadvantage of the known design is that a large number of support rollers significantly increases the total deformation of the working stand, which reduces the accuracy of the rolled pipes.

Of the known stands of cold rolling pipe mills, the closest in technical essence is the stand described in the book Koff Z.A. and others. "Cold rolling of pipes", 1962, p. 230, Fig. 114.

The well-known working stand of the cold rolling pipe mill with rollers contains a movable power bed (carriage) with support bars (slats) and a movable multi-roller cassette (separator) with rollers on pins that are in contact with the support bars of the movable bed. Pillows are mounted on the same pins on sliding bearings. Pillows are spring-loaded and mounted in the slots of the cassette.

A disadvantage of the known design of the working stand is that the relative orientation of the rollers in the cassette is carried out using pillows with sliding bearings, which is ensured by the precision of manufacture without the possibility of adjusting the position of the rollers. As wear and tear, orientation accuracy decreases, which leads to a decrease in the quality of rolled pipes. Another disadvantage of the known design is that the contact of the rollers with the support bars in the extreme positions of the stand when changing the direction of movement and the absence of rolling loads is ensured by springs, the magnitude of which, and consequently, the force is determined by the dimensions of the axles of the roller. Since the diameter of the pins is much smaller than the diameter of the rollers themselves, and the springs are placed in dimensions determined by the dimensions of the pins, the forces developed by the balancing springs are negligible. As a result of this, when changing the direction of rotation in the extreme positions of the cage, the rollers slip and cause defects on the pipe surface. When using this design to eliminate slipping, it is necessary to significantly reduce the speed of the mill, which leads to a decrease in productivity.

The objective of the present invention is to create a working stand of the cold rolling pipe mill, providing increased speed of the mill and improving the quality of rolled pipes.

The task is achieved in that in the working stand of the cold rolling pipe mill containing a movable power bed with support bars and a movable cassette, in the housing of which there are deforming rollers with two pins interacting with the support bars of the bed, according to the invention, the movable cassette is equipped with two shoulders by the number of deforming rollers, and deforming rollers are made with two additional trunnions, on which bearings are mounted, located in the shoulder of the two shoulders of the lever, in parallel rolling axis, each two-arm lever mounted on the axis of the cartridge cassette with the possibility of rotation and longitudinal movement along it, in addition, the cartridge case and the second shoulder of each two-arm lever, located in a plane perpendicular to the rolling axis, are connected by a spring-loaded rod, providing clearance-free contact trunnions with support bars of a movable power bed.

This design of the working stand allows you to strengthen the contact of the rollers with the support bars of the movable bed and thereby increase the speed of the mill, as well as improve the quality of rolled pipes by adjusting the position of the rollers relative to the axis of the rolled pipe.

To explain the invention, a specific embodiment of the invention is given below with reference to the accompanying drawings, in which:

figure 1 - shows the working stand of the cold rolling mill, a cross section;

figure 2 is the same, a longitudinal section along the rolling line.

The working stand of the cold pipe rolling mill contains a movable bed 1 with support bars 2 and a movable cartridge 3. In the housing 4 of the cartridge 3 are placed deforming rollers 5 with trunnions 6 interacting with the supporting bars 2 of the bed 1, and additional trunnions 7 on which bearings 8 are mounted The movable cartridge 3 is equipped with two shoulders levers 9 in the number of deforming rollers 5, while one shoulder 10 of each lever 9 is parallel to the rolling axis, and the other shoulder 11 is located in a plane perpendicular to the rolling axis. Each two-arm lever 9 is mounted in the housing 4 of the cartridge 3 on the axis 12 on the bearings 13 and bushings 14. Between the sleeve 14 and the housing 4 of the cartridge 3 are mounted wedges 15. The bearings 8 mounted on additional trunnions 7 are also located in the bores of the shoulder 10 of the levers 9. The rollers 5 are fixed in the levers 9 and with the help of wedges 15 can be moved in the process of tuning to any desired value. The housing 4 of the cassette 3 and the shoulder 11 of each lever 9, located in a plane perpendicular to the rolling axis, are connected by a rod 16, pressed by a spring 17. The springs 17 mounted on the rods 16, under the influence of the adjusting nuts 18, press the axles 6 to the support bars 2. At the same time the dimensions of the springs 17 and the forces of their tightening are set so as to prevent slipping between the surfaces of the trunnions 6 of the rollers and the surfaces of the support bars 2.

During operation of the mill bed 1 and the cassette 3 are moved reciprocally relative to the pipe and relative to each other. To obtain the pipes of the required size and quality, the position of the deforming rollers is adjusted 5. The adjustment is made by moving the sleeve 14 using wedges 15. In this case, the levers 9 fixed on the sleeve 14 with bearings 13 and the deforming rollers 5 fixed in the lever 9 sec using bearings 8, they are moved by wedges 15 by the required amount.

Since the profile of the support bars 2 is variable in height, during the rolling process, the deforming rollers 5 move in a plane perpendicular to the axis of the rolled pipe, while the levers 9, due to the installation on the axis 12 on the bearings 13, perform a swinging motion.

The proposed working stand of the cold pipe rolling mill in comparison with the known ones allows to improve the surface quality of rolled pipes and increase speed by eliminating slippage of the deforming rollers.

Claims (1)

The working stand of the cold pipe rolling mill, comprising a movable power bed with support bars and a movable cassette, in the housing of which are deforming rollers with two pins interacting with the support bars of the bed, characterized in that the movable cassette is equipped with two shoulders according to the number of deforming rollers, and deforming the rollers are made with two additional pins on which the bearings are mounted, located in the shoulder of the two shoulders lever parallel to the rolling axis, with each two shoulders the chag is mounted on the axis on the axis of the cassette with the possibility of rotation and longitudinal movement along it, in addition, the cassette body and the second shoulder of each two shoulders of the lever, located in a plane perpendicular to the rolling axis, are connected by a spring-loaded rod, which ensures axle-free contact of the pins with the support bars of the movable power frame .

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