SU1115830A1 - Unit for coiling multilayer shells - Google Patents

Abstract

UNIT FOR LABORING MULTI-LAYER SHUTTERS containing successively placed feeding machine, three-roll bending caliber and winding device, whose axis is displaced relative to the working aggregate of the unit, characterized by the working plane of the unit in the direction opposite to the location of the winding device, with the apex of the angle of inclination facing the feed machine. sl 00 with

Description

The invention is related to the processing of metals by pressure, in particular, for the preparation of tubular billets, and can be used in the manufacture of welded multilayer pipes, intended for the construction of main gas pipelines. A known unit for winding both gulls containing sequentially placed feeding machines, a three-roll bending caliber, a winding device L1. 3 The disadvantage of this unit is the inability to ensure tight winding of the oil, especially in the last turns of the strip, which is caused by strip stripping, curved on the bending machine. In order to increase the density of winding on a bending machine, the lower output roll is movable on the site. However, even in this case, the size of the gaps between the layers reaches 1.5-3.0 mm, which is not permissible, since after the operation of expansion the interlayer gaps remain on the shells, which cause the transfer of such shells to a category of lower quality. The purpose of the invention is to increase the flatness of the winding. This goal is achieved by the fact that in a known unit for winding multi-layer shells containing successively placed a feeding machine, a three-roll bending caliber and a winding device whose axis is displaced relative to the working cavity of the unit, the three-roll bending caliber is inclined at an angle of 715 to the working cavity of the unit in the direction opposite to the location of the coiling device, with it the top of the angle of inclination turning to the side of the feeder. The drawing shows a diagram of the device. The scheme includes a winding device in 1, a three-roll bending caliber 2 with an upper moving roller, intermediate vehicles. made in the form of roller postings 3, the supporting machine 4, the inlet vehicle 5, which is a roller conveyor, the winding strip 6. The winding of the shells is carried out as follows. 0 The front end of the strip 6 by roller table 5 is set into diluted, the rolls of the feeding machine 4. After that, the upper roller of the feeding machine is lowered and, through the intermediate roller wires 3, set the strip into the bending gauge 2. The front end of the strip after bending in the bending machine is set into the gap between the drum and the coiling device of the coiling device 1. After the formation of the first coil. the speed of rotation of the drum is increased to working, and to ensure the tension of the strip reduces the speed of splicing of the rollers of the setting machine. The tensioned winding strip at the exit of the bending machine, due to its inclination, interacts only with its upper roller, the position of which from this moment determines the final bending radius of the winding strip. In this case, the movement of the upper roll of the bending machine to the lower position is sufficient to bend the strip to a radius equal to (or somewhat smaller) the radius of the coiling drum (which cannot be achieved on a known aggregate). As a result, the layers wound tightly enclose the drum, which determines a more dense winding of the shells. When the angle of inclination is less able to eliminate the decomposition of the curved strip, and therefore reduce the gaps between the layers. An inclined machine at an angle of more than 15 leads to a deterioration in the conditions that predetermine the tight pressing of the first turn to the surface of the winding drum, which is necessary to create the required tension on the strip. As a result, the first turn of the strip begins to slip over the surface of the drum and the density of the wrapped shells decreases markedly. The proposed construction of the unit for winding the shells was tested in the shop of multilayer pipes in the manufacture of 4-layer shells with an inner diameter of 1380 mm from steel 09G2SF 5.4 mm thick. The winding is carried out with an inclination of the 3-roll bending machine at an angle of 9 °. At the same time, the shells are wound from the same strip on a known assembly, i.e. on the unit in which

3

Z-roll bending machine is installed horizontally.

The density of the coiling is estimated by the magnitude of the interlayer gaps. Between . layers of shells, wound on an aggregate, in which the Z-roll bending machine is inclined, are observed separate local gaps, the value of which n exceeds 0.6-1.0 mm. At the ends of the shells, wound on a known unit, the size of the interlayer gaps is in the range of 1.5-3.0 mm. This indicates an increase in the density of winding 2.5-3 times in the case of winding them on the proposed unit.

8304

The basic object is a unit for winding the shells, installed at the Vyksa Steel Works (VIZ) and accepted as a prototype.

The use of the unit for winding the shells of the proposed construction in comparison with the known one allows to increase the density of the winding of the shells, i.e. reduce the amount of 1-layer gaps by preventing the pre-curved strip from being unfolded on the lower roll of the bending machine

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Claims (1)

UNIT FOR WINDING MULTI-LAYERED SHELLS, comprising a feed machine, a three-roll bending gauge and a winding device, the axis of which is offset from the working plane of the unit, characterized in that, in order to increase the density of winding, the three-roll bending gauge is inclined at an angle of 7-15 ° to the working plane of the unit in the direction opposite to the location of the winding device, with the apex of the angle of inclination facing the feed machine.