RU2286221C1 - Working line of 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 line of tube cold rolling mill includes working stand with movable load-bearing bed frame equipped with rails and cassette whose movable body is provided with deforming tool; working line is also provided with drive for motion of cassette and leverage drive for motion of load-bearing bed frame with connecting rod links and lever on hinged support. Cassette motion drive is made in form of planetary crank unit at rectilinear reciprocating motion of crank in vertical plane running through line of rolling and counter-weights for equalizing dynamic loads arising in the course of motion of working stand; cassette body is provided with tail-piece with bearing of cassette motion drive crank. Tail-piece of cassette body is connected with lever of load-bearing bed frame motion drive by means of connecting rod link; lever support is mounted on cassette motion drive body on side opposite to zone of motion of working stand. Moment of inertia of counter-weights of cassette motion drive is equal to total moment of inertia of cassette, bed frame and bed frame motion leverage.

EFFECT: increased productivity of rolling mill due to increased speed of movable parts and balancing of dynamic loads in working stand motion drive.

1 dwg

Description

The invention relates to pipe production, and more specifically to cold rolling mills of especially thin-walled pipes.

A known working line of a cold rolling mill (see GDR patent No. 257215, class B 21 B 35/00, application form 19.06.87, publ. 8.06.88), in which the drive is made planetary-crank, and the working stand is made with mobile power bed. The drive for moving the stand includes a stationary central wheel mounted in the housing with an internal gear rim, a drive carrier coaxial with it, installed in a satellite carrier with a crank, the bearing on which is mounted in the power frame of the working stand. A disadvantage of the known design is that the working stand with a movable power bed does not provide the possibility of producing particularly thin-walled pipes due to the insufficient strength of the roller bearings and, as a consequence, the impossibility of using small diameter rolls.

Of the known structures, the closest in technical essence is the working line of the cold rolling mill for especially thin-walled pipes by rollers, described in the book "Cold pipe rolling mills" (Yu.F. Shevakin, F.S.Seydaliev, Metallurgy, 1966, p. 87 -89). This working line consists of a working stand containing a movable bed with support rails and a cassette with a deforming tool, a drive for moving a movable bed made by a crank, and a lever drive for moving the cassette with connecting rods and a lever on a hinged support.

In the known design, small diameter rolling rollers are used as a deforming tool, which makes it possible to roll thin-walled pipes and allows the working stand to be adjusted to the optimum rolling radius by changing the arms of the cassette drive lever.

A disadvantage of the known design is the low balance of dynamic loads in the crank drive and the presence of significant vertical forces on the guides of the movable frame and cassette. The consequence of this is an increase in the weight of the moving parts of the working stand, and consequently, drive power to move the stand and increased energy consumption in the production of pipes.

The objective of the invention is to increase the productivity of the mill by increasing speed by reducing the weight of the moving parts and balancing the dynamic loads in the drive moving the stand.

The task is achieved by the fact that in the working line of the cold pipe rolling mill containing the working stand with a movable power bed with support rails and a cassette, in the moving case of which there is a deforming tool, a cassette movement drive and a lever drive for moving the power frame with connecting rod rods and a lever on articulated support, according to the invention, the cassette is driven planetary-crank with a rectilinear reciprocating movement of the crank in a vertical plane passing through the rolling line, and counterbalances the dynamic loads arising from the movement of the working stand, and the cassette body is equipped with a shank in which the bearing of the cassette drive drive crank is located, while the shank of the cassette body is connected to the drive lever for moving the power frame by means of a connecting rod, the lever support is mounted on the casing of the drive to move the cartridge from the opposite side from the zone of movement of the working stand, and the moment of inertia of the balances the moment of inertia of the cassette, bed and lever drive to move the bed.

This design of the working line of the cold pipe rolling mill provides a reduction in the weight of the moving parts of the working stand and balancing of dynamic loads in the drive drives of the cassette and the bed, as a result of which the productivity of the mill is improved.

To explain the invention, a specific embodiment of the invention is given below with reference to the accompanying drawing, which shows a working line of a cold pipe rolling mill, a longitudinal section.

The working line of the cold pipe rolling mill (see drawing) consists of a working stand 1, containing a movable power bed 2 and a movable cassette 3, a drive 4 for moving the cassette 3 and a lever drive 5 for moving the bed 2. On the frame 2, the support rails are fixed 6. Cassette 3 comprises a housing 7 with a shank 8 and a deforming tool 9. The drive 4 for moving the cartridge 3 is mounted in the housing 10 and is made of a planetary crank with a rectilinear, reciprocating moving crank 11, an internal gearing wheel 12 and a carrier 13 driven in expansion through a gear 14 by an electric motor 15. The carrier 13 is equipped with a counterweight 16, the shaft of the crank 11 is equipped with a counterweight 17. The bearing 18 on the crank 11 is mounted with its outer ring in the shank 8 of the housing 7 of the cassette 3. The lever drive 5 for moving the power frame 2 contains a swinging lever 19 s support 20, connecting rod rods 21, 22, connecting the swing arm 19, respectively, with the shank 8 and with the frame 2 of the working stand 1.

During the operation of the line from the electric motor 15, the rotation through the gear train 14 is transmitted to the carrier 13, while the crank 11 makes a reciprocating rectilinear motion in a vertical plane passing through the rolling line. The cassette 3 of the working stand 1 through the shank 8 with the bearing 18 of the crank 11 located therein also moves back and forth. At the same time, under the influence of the connecting rod rod 21, the lever 19 makes a reciprocating motion. This movement through the connecting rod rod 22 causes the frame 2 to reciprocate, synchronous with the movement of the cassette 3 of the working stand 1. The deforming tool 9 of the cassette 3 is rolled along the moving support rails 6 and deforms the pipe.

The counterweights 16 and 17 are made with the moment of inertia equal to the total moment of inertia of the cartridge 3, the bed 2 and the lever drive 5 of the movement of the bed 2 of the working stand 1. When the carrier 13 is rotated and the crank 11 due to the centrifugal forces arising from the rotation, the inertia forces are balanced during movement working stand. This reduces the load on the drive and increase the speed of the working line of the mill.

The placement of the hinge support 20 of the lever 19 in the housing 10 of the actuator 4 can reduce the size of the working line along the length and reduce the weight of the moving parts, which improves the speed and productivity of the cold rolling mill.

Claims (1)

The working line of the cold pipe rolling mill, comprising a working stand with a movable power bed with support rails and a cassette, in the moving case of which a deforming tool, a cassette drive and a lever drive for moving the power bed with connecting rods and a lever on a hinge support are located, characterized in that the drive for moving the cartridge is planetary-crank with a rectilinear reciprocating movement of the crank in a vertical plane passing through the rolling line, and counterbalances weighing dynamic loads arising from the movement of the working stand, and the cassette body is equipped with a shank in which the bearing of the crank of the cassette drive is located, while the shank of the cassette body is connected to the drive lever for moving the power frame by means of a connecting rod, the lever support is mounted on the cassette drive drive housing with of the opposite side from the zone of movement of the working stand, and the moment of inertia of the counterweights of the drive for moving the cartridge is equal to the total moment of inertia of the cartridge, bed and p of the lever drive for moving the bed.