SU1590148A1 - Bending-tensioning device for line of continuous tube electric welding unit - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of welded pipes of small and medium diameters on continuous electric pipe welders. The purpose of the invention is to improve the quality of the pipes by eliminating the biting and twisting of the strip in the tensioning device. The bending-tensioning device of the line of a continuous electric pipe welding unit contains non-driven bending rollers 1 and 2, an inlet stationary roller 3, vertical guides 4 in which the upper roller 5 is mounted so that the upper roller 5 is rotatably mounted on an axis, and the axis itself provided with actuators 7 (springs or pneumatic cylinders) connected to its ends. When the device is in operation, the bending strip 6 is pressed by the roller 5 to the roller 3 and the first lower roller 1 of the bending-tensioning device so that it touches across the entire width of the rollers, and the sickle-shaped strip 6 is selected by tilting the upper roller 5. 1 sludge.

Description

The invention relates to the processing of metals by pressure, and can be used in the manufacture of welded pipes of small and medium diameters for continuous pipe-welding units.

The aim of the invention is to improve the quality of pipes and save metal by eliminating biting and ed twisting of the strip in the bending and tensioning device.

- The drawing shows the bending circuit: No-tension device (GNU) of the line ί continuous electric welding ed! unit *

Non-driveable are indicated on the diagram: fixed 1 and movable 2 bending i rollers, stationary input roller 3, movable in the vertical direction (mounted in vertical; directing 4 for constant preloading and 25; ensuring contact across the entire width of the roller 5 with strip 6, regardless of the presence of crescent on it.

The device operates as follows. ed

The strip 6 included in the GNU falls onto the roller 3 and is pressed against it by the roller 5, which in the guides 4 has the ability to move in a vertical plane.

In the absence of crescent, the axis of the roller 5 is parallel to the axis of the roller 3 .. When crescent appears, the resistance of the roller 5 from the long edge side decreases and under the action of the dd drive, the corresponding side of the roller moves down. In this case, the torsion of the strip occurs around the short edge in the area between the roller 3 and the first of the fixed genera ₍ faces 1. Roller 5 is rolled until the long edge is pressed against the surface of the roller 3 and the first bending roller, which required from the device, with such a fit kinks and bites are excluded

When the sickle sign changes, the direction of the tilt of the roller changes.

Subsequently, on rollers 1 and 2, the profile is drawn, first of all, of the short edge to the long edge, and the risk of kink and biting is eliminated. Roller 5 changes its position depending on the ratio of the lengths of the right and left edges.

Consider an example of the operation of the device in the manufacture of pipes 102x3.0 mm from a strip 312x3.2 mm.

Band 6 with a crescent value, expressed as a deflection of 20 mm at a base length of 3000 mm in the horizontal plane before alternating bending with tension in a GNU with a group of stationary 1 and 2 movable rollers, comes from the loop pit into a pair of rollers 3 and 5, the last of which moves in guides 4 and can be inclined to the horizontal plane. Under the influence of the roller 5, the short edge is pressed against the surface of the roller 3 and the first bending roller, after which only the long edge moves downward, while the upper roller 5 is skewed. With this movement of the upper roller 5, the profile of the strip .6 is twisted around the short edge, while the long edge is also pressed against the roller 3 and the first bending roller, which eliminates biting and crushing on the rollers 1 and 2.

With a crescent of 20 mm at a base of 3000 mm, the long edge is moved by a roller 5 downward relative to the short edge by an amount of the order of 14 mm.

When changing the direction of curvature of the strip, the roller warps to the other side.

EFFECT: invention provides higher quality of manufactured pipes on a continuous pipe-welding unit due to the fact that the strip is defined in the bending and tensioning device pressed against the generatrix of the first bending roller of the device, therefore, the possibility of its biting by the flanges of the rollers and twisting is excluded. The edges of the strip arrive at the weld without burrs and deformations, which ensures high quality of the weld.

Claims (1)

Claim A bending-tensioning device for a line of a continuous pipe-welding unit, including non-driven bending rollers, characterized in that, in order to improve the quality of pipes and save metal by eliminating biting and twisting of a strip in a bending-tensioning device, it is equipped with vertical guides and a pair of rollers mounted on axles, with the possibility of free rotation, at the entrance of the bending and tensioning device, while the axis of one roller is mounted stationary and parallel to the axes of the rollers of the bending and tensioning device -keeping, t guides are installed between this roller and the bending and tensioning device, and the axis of the other roller is mounted. on parallel to the axes of the rollers of the flexure-tensioning device in vertical guides with the ability to move and tilt, and is equipped with displacement drives installed with the possibility of interaction with its ends.