RU2349402C1 - Tube-rolling mill back bench - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention concerns metal deformation process and can be used for tube-rolling short-adapter mill with axial products distribution. Back bench of tube-rolling mill contains frame, installed on it centering unit, distributing lifting bottom and top and pressure top rollers, located between centering unit, and hard-control gear. Distributing bottom lifting rollers and top pressure rollers are connected by turns in pairs and located lengthways all back bench of mill. Distance between axis of paired rollers is less or equal to distance between rollers couples.

EFFECT: invention provides unhampered distributing of short bushing at the expense of its warp elimination while transportation, that will provide to improve productivity.

7 dwg

Description

The invention relates to the field of pipe production, and more specifically to the working lines of pipe mills with axial delivery of products. The invention can most effectively be used in short-range tube rolling mills: piercing, rolling, longitudinal rolling mills.

Known back table of the tube mill, see A. with. No. 759156, M. cl. B21B 25/02, 39/14, claimed 06/03/78, op. 08/30/80, which contains a frame, centralizers installed on it with extension rollers, the first of which has a longitudinal displacement drive, a thrust-adjusting mechanism and a platform placed in front of the thrust-adjusting mechanism, having a lateral movement drive and locking mechanisms. A part of centralizers with outstanding rollers and an additional thrust-adjusting mechanism mounted parallel to the axes of the centralizers are mounted on the platform.

A disadvantage of the known rear table of the tube mill is the significant time spent on moving and locking the platform for rolling on short rods, which reduces the productivity of the mill.

Another disadvantage is that the length of the sleeve is limited and must be greater than or equal to twice the distance between the centering rollers L _g ≥2L ₁ ,

where L _g - the length of the sleeve, L ₁ - the length of the rollers of the centering, which does not allow rolling short sleeves.

Of the known closest in technical essence is the back table of the rolling mill described in A.S. USSR No. 1577897, M. cl. B21B 25/02, 39/14, claimed 04/20/88, publ. 07/15/90

This rear table of the rolling mill contains a frame, centralizers installed on it, issuing lifting lower and pressure upper rollers located between the centralizers, the stop-adjusting mechanism and supporting rollers. The centering devices are located on a platform with a lift drive and a position lock. The levers of the lower output rollers are connected by a rod and have an additional lock of these levers.

A disadvantage of the known design of the rear table of the tube mill is that it is impossible to roll short sleeves on it due to their misalignment during transportation, since the length of the rolled sleeves is limited and must be greater than or equal to twice the distance between the output rollers, which also reduces productivity.

An object of the present invention is to provide a back table for a tube mill, which allows for the unhindered delivery of short sleeves by eliminating their skew during transportation and thereby increase productivity.

The problem is achieved in that in the rear table of the rolling mill containing the frame, centralizers installed on it, issuing lifting lower and pressure upper rollers located between the centering devices and a stop-adjusting mechanism, according to the invention, issuing lower lifting rollers and upper pressure rollers are connected alternately in pairs and are located along the entire rear table of the mill, while the distance between the axes of the paired rollers is less than or equal to the distance between the pairs of rollers.

Such a constructive implementation of the rear table of the rolling mill will ensure the unimpeded delivery of short sleeves by eliminating their skew during transportation, which will increase the productivity of the mill.

This is achieved due to the fact that the distance between the pairwise connected rollers is less than or equal to the distance between the pairs of rollers, so the short sleeve during transportation is constantly on two rollers, which eliminates its skew.

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

figure 1 shows the rear table of the rolling mill, General view;

figure 2 is the same, plan view;

figure 3 is a section aa in figure 1;

figure 4 is a view along arrow B in figure 3;

figure 5 is a section bb in figure 1;

in Fig.6 is a section GG in Fig.2;

Fig.7 is a diagram of the transportation of the liner on the outstanding supporting rollers of the rear table of the rolling mill.

The back table of the rolling mill contains a frame 1, centering devices 2 mounted on it, issuing lifting lower 3 and pressing upper 4 rollers located between the centering devices 2, and a stop-adjusting mechanism 5. The centering devices 2 are made of three rollers and are designed to hold the rod with a mandrel on the rolling axis in the initial period of flashing the liner. Centering 2 with rollers 6 provide a constant location of the axis of the centered rod 11 when changing its diameter. The lower 3 lifting rollers and the upper 4 pressing rollers issuing are alternately connected in pairs and are located along the entire rear table, and the distance l ₁ between the axes of the pairwise connected rollers is less than or equal to the distance between the pairs of rollers l (l ₁ ≤l). The output rollers are designed to extend the sleeve outside the rear table onto the roller table 7. The thrust-adjusting mechanism 5 with the thrust head is mounted on the frame 1 behind the centering devices 2 and the output rollers 3, 4 and is designed to perceive the rolling forces acting on the mandrel and the shaft, and to adjust the position mandrels in the deformation zone, water supply for cooling the rod with the mandrel, the delivery of a stitched sleeve to the roller table 7 at the rear table. To maintain the sleeve and its transportation through the stop-adjusting mechanism 5 on the frame 1, a support roller 8 and output rollers 9, 10 are mounted behind it.

The back table of the rolling mill operates as follows.

At the beginning of rolling, the rod with the mandrel 11 is located on the rolling axis and is supported by the rollers 6 of the centralizers 2, the stop-adjusting mechanism 5 is closed, the lower output rollers 3 are lowered, the upper pressure rollers are raised. When the sleeve 12 comes out of the rolls of the working stand with the help of extension rollers and moves it around the back table, the rollers 6 of the centralizer 2 alternately open, passing the sleeve 12. At the same time, the first centralizer keeps the core with mandrel 11 from the stand. After rolling, the pair of lower output rollers 3 are connected in pairs rise. The pairwise connected upper pinch rollers 4 are alternately lowered and the short sleeve 12 is transported to the thrust-adjusting mechanism 5, the head of which is tilted for passage of the sleeve. Due to the pairwise connected output rollers, the sleeve 12 is constantly located on two rollers, which eliminates its warping during transportation. To maintain the sleeve 12 during transportation through the stop-adjusting mechanism 5, the supporting roller 8 is lifted and the dispensing rollers 9, 10 extend the sleeve 12 outside the rear table onto the roller table 7. After the sleeve 12 is extended outside the rear table, the upper pressure issuing rollers 4 rise, the lower ones rollers 3 are lowered. The rollers 6 of the centralizers 2 are alternately reduced to a rod with a mandrel 11, after which the head of the thrust-adjusting mechanism 5 is brought into the working position.

The proposed rear table of the tube mill compared with the known ones allows for the unhindered delivery of short sleeves by eliminating their skew during transportation, which will increase the productivity of the mill.

Claims (1)

The rear table of the tube mill, comprising a frame, centering devices mounted on it, issuing lifting lower and pressure upper rollers located between the centering devices, and a thrust-adjusting mechanism, characterized in that the output lower lifting rollers and upper pressure rollers are connected alternately in pairs and are located along the rear table, while the distance between the axes of the pairwise connected rollers is less than or equal to the distance between the pairs of rollers.

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