RU2231409C1 - Universal stand of shape bending mill - Google Patents

Abstract

FIELD: rolled stock production, namely manufacture of shaped tubes.

SUBSTANCE: universal stand includes two horizontal and two vertical rolls whose axes are arranged in the same plane. Roll journals are mounted outside stand housing by means of cover strips with use of bolts with possibility of vertical and horizontal motions. Each roll has arbor on which profiling washer with predetermined diameter and width is mounted. Limiting beads there are in one end of working portion of washer. Profiling washer of upper horizontal roll is mounted with possibility of axial motion by means of two threaded sleeves placed on washer axis at both sides. Said sleeves have at side of profiling washer outer threaded portions of predetermined length with opposite, left-hand and right-hand threads; said portions rest by their one end upon limiting beads. Plate type nuts are screwed on threaded sleeves and they rest upon ends of profiling washer. Direction of screwing on of each plate type nut until it rests upon profiling washer coincides with rotation sign of horizontal roll at profiling process. Total length of threaded sleeves is less than distance between beads. Openings for bolts in cover strips for mounting vertical rolls are vertically elongated; their length is sufficient for moving rolls.

EFFECT: enhanced quality of tubes, lowered wear of rolls and labor consumption.

2 cl, 3 dwg, 1 ex

Description

The present invention relates to equipment for the production of rolled products and can be used in the manufacture of shaped pipes.

Such pipes of various cross sections (most often square or rectangular) are usually made of straight-seam electric-welded round pipes by their corresponding molding using four-roll stands, and each roll profile uses its own set of rolls.

In the manufacture of a profile pipe, a round section is first formed, which, after welding the seam, is transformed into the desired section. In principle, for the manufacture of shaped pipes, a roll forming mill containing a welding stand and universal (four-roll) stands can be used. Design features of such stands are described, for example, in a book under the editorship of Trishevsky I.S. Production of bent profiles (equipment and technology). - M.: Metallurgy, 1982, p.102-104. The gauges of such stands are designed to form one specific profile size.

Known universal working stand roll forming unit, in which osadderzhatel vertical rollers made U-shaped, envelope horizontal rolls and mounted on sliders mounted on a bed (see AS USSR No. 245523, class. 23 K, publ. 15.04.70 g.). Also known is a roll forming machine for bending channels, containing universal stands with three pairs of vertical rolls located on the sides of a moving profile, of which one pair is installed in the plane of horizontal rolls (see Japanese application No. 52-32166, class B 21 D 5 / 08, published on October 16, 78).

A disadvantage of the known universal stands is the ability to manufacture with their help only one profile size (on one set of rolls).

Closest to the claimed object is a universal (molding) stand of the roll forming unit 1-4 × 50-300, given in the Guide to rolling and pipe production Ya.S. Finkelstein, Moscow: Metallurgy, 1975, p. 247 and 248 and Fig. 2.

This stand contains two horizontal and two vertical rolls, the axes of which lie in the same plane, and the rolls are made to move both vertically and horizontally and consist of axes with restrictive flanges at one end of their working part, on which profiling washers are mounted of specified diameters and widths, and the cage is characterized in that the cassettes of the vertical rolls are fastened on the outside of the frame by strips with bolts, and the horizontal axis holders of these rolls are mounted in the cassettes. The disadvantage of a universal stand of this design is the need to replace (reload) the rolls when switching to a new profile size, if a profile pipe of square or rectangular cross section is formed in the stand. As a result of this, the roll consumption increases, and labor costs increase.

An object of the present invention is to reduce the consumption of rolls and reduce labor costs when forming profile pipes of the aforementioned configuration on a roll forming mill.

To solve this problem, in a universal stand, containing two horizontal and two vertical rolls, fastened on the outside of the frame by strips with bolts, the axes of all rolls lying in the same plane, and the rolls are made to move both vertically and horizontally and consist of axes with restrictive flanges at one end of their working part, on which profiling washers of specified diameters and widths are installed, bushings additionally mounted on the axis of the upper horizontal roll on both sides of the washer I have one end in the restriction flanges and with external threaded sections of a given length on the side of the washer, the threads of the bushings have opposite left and right directions, and the direction of twisting of each nut all the way into the washer coincides with the direction of rotation of the roll during profiling, while the total length of the bushings is less the distance between the flanges of the axes by the amount Δ = b + δ, where b is the width of the washer, δ is the required value of its displacement along the axis, and the holes for the bolts in the mounting plates of the vertical rollers are made elongated vertically hiccups with a length sufficient for the required movement of these rolls. The profiling washer of the lower roll can also be made with the possibility of axial movement similarly to the washer of the upper roll.

The essence of the proposed technical solution is to create such a universal stand design that allows you to install horizontal and vertical forming washers with significant shifts relative to each other horizontally and vertically, as shown in figure 1. In this case, a closed square or rectangular gauge is formed, the minimum area of which is almost zero, and the maximum is determined by the width of the washers and the possibility of their movement in the corresponding direction.

In the above-described universal stand, there is only an adjustment movement of the vertical rolls by a very limited amount (5 ... 10 mm) vertically, which makes it necessary to change the rolls when switching to a new pipe size profile formed in this stand.

The design of the proposed stand is shown in figure 1, and the installation (movement) of the rolls for the formation of the caliber of the required size is shown in figure 2.

The stand (see figure 1) contains the upper 1 and lower 2 horizontal rolls and the left 3 and right 4 vertical rolls, which are non-driven. Horizontal rolls have washers (profiling) washers 5 of diameter D, and vertical ones have washers 6 of diameter d, and D> d; the axes of all the rolls lie in the same vertical (axial) plane of the yy stand.

The lower roll 2 is installed at a constant level and without the possibility of moving vertically. The upper roll 1 is moved vertically by means of pushing devices 7 mounted in the stands of the stand 8, and its forming washer 5 is moved horizontally by rotation of the disk nuts 9 screwed onto the threaded sleeves 10, which abut against the limiting flanges 11 of the roll axis 11 . The threads on the bushings and nuts to the left and right of the washer have opposite directions, as a result of which the direction of twisting of each nut all the way into the washer coincides with the direction of rotation of the roll during profiling, thereby preventing their arbitrary “unscrewing” with known negative consequences.

Vertical rolls 3, 4 are installed in cassettes 12, which are fixed in the openings 13 of the frame 8 using plates 14 attached to the frames by bolts 15. The holes of these bolts are made elongated vertically, which allows you to move the cassettes at predetermined distances in the vertical plane. The movement of the vertical rolls across the direction of profiling (i.e. horizontally in the plane of the drawing) is carried out inside the cassettes using the adjusting screws 16.

This design of the stand makes it possible to change the configuration and the area of the caliber (as shown in the diagram of figure 2) without replacing the rolls, i.e. on one of their sets to produce an extensive assortment of profile pipes. As follows from figure 2, to vary the size of a rectangular (square) gauge left vertical roll enough to move only horizontally (shown by arrows). However, the proposed design provides for its vertical movement, which is necessary when changing the diameter of the washer 5 of the lower roll (for example, when regrinding on the wear of its working surface).

An experimental verification of the claimed stand was carried out on a roll forming unit 1-4 × 50-300 of CJSC “KGP” of Magnitogorsk Iron and Steel Works during the formation of square and rectangular pipes of various sizes and grades of steel.

The test stand in all cases was the finishing (last). In the experiments, the geometry and surface quality of the profile pipes obtained by installing the same rolls in the stands were evaluated. The quality level of the profiles was compared with the quality of products obtained using well-known universal stands (see above).

The experiments showed that in both cases the level of quality of the profile pipes was almost the same. The technical and economic analysis performed at the Central Control Laboratory of OJSC MMK shows that the use of a universal stand of the proposed design reduces roll consumption in the production of shaped pipes by an average of 2.5 times while reducing labor costs by at least 20%.

Thus, the pilot test confirmed the acceptability of the claimed object to solve the problem and its advantages over the known device.

Concrete example

A universal stand (see figure 1) is used as a finishing stand during molding from a round longitudinal seam pipe with a diameter of 60 mm and a thickness of 2.5 mm (material - st. 3ps) of shaped tubes of square section 41 × 41 mm ² and rectangular 27 × 55 mm ² .

The diameter of the profiling washers of the horizontal rolls is 315 mm, and their width b = 80 mm; the diameter of the vertical rolls is 190 mm.

The total length of the threaded bushings of the horizontal rolls is l = 220 mm, and the distance between the flanges of the axes of these rolls is L = 380 mm, i.e. Δ = b + δ = L-l = 380-220 = 160 mm and the displacement of the washers δ = Δ-b = 160-80 = 80 mm.

The length of the vertically elongated holes for the mounting bolts of the slats allows you to move the cartridges of the vertical rolls to a distance of 50 mm.

Claims (2)

1. A universal stand of a profile bending mill, containing two horizontal and two vertical rolls with axes located in the same plane, strips fixed to the outside of the bed with bolts with the ability to move vertically and horizontally, each of the rolls consists of an axis with a profiling washer installed on it with a given diameter and width and restrictive flanges at one end of its working part, characterized in that the profiling washer of the upper horizontal roll is made with the possibility of axial displacement by means of threaded bushings mounted on an axis on both sides of the shaft, having external threaded portions of a given length on the side of the profiling washer with threads of the opposite left and right direction and abutting against one end with restrictive flanges, and screwed onto the threaded bushings of plate nuts resting against the ends of the profiling washer , the direction of screwing each disk nut all the way into the profiling washer coincides with the direction of rotation of the horizontal roll during profiling, the total length the threaded bushings are less than the distance between the flanges of the axes by Δ = b + δ, where c is the width of the profile washer, δ is the required value of its movement along the axis, and the holes for the bolts in the mounting plates of the vertical rolls are made elongated vertically, the length of which is sufficient for the required displacement of these rolls. 2. The cage according to claim 1, characterized in that the profiling washer of the lower horizontal roll is made with the possibility of axial movement similarly to the profiling washer of the upper roll.

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