RU2228231C2 - Sheet straightening machine - Google Patents

Abstract

FIELD: metallurgical machine engineering, namely straightening apparatuses mounted in lines of thick sheet rolling mills and designed for correcting at operation non-planeness of moving sheets. SUBSTANCE: sheet straightening machine includes arranged in housing upper and lower cartridges carrying straightening driven rollers mounted with possibility of vertical motion. Sheet straightening machine includes mechanism for horizontally shifting lower cartridge in direction of passing straightened material; drive units of said mechanism are mounted in housing. Working organs of drive units may engage with lower cartridge. Drive units of mechanism for horizontally shifting lower cartridge are in the form of hydraulic cylinders. EFFECT: enhanced reliability of sheet straightening machine, improved quality of straightened strips. 2 cl, 6 dwg

Description

The invention relates to the field of metallurgical engineering, and in particular to the correct devices, which serve to correct on-the-fly flatness defects of moving sheets and installed in the lines of plate rolling mills.

Known sheet straightening machine according to the patent of Russia No. 211 8920 C1, B 21 D 1/02, in the frame of which are mounted offset and upper relative to each other lower rolls, based on placed along the length of the right rolls and installed in the lower and upper cassettes of the support rollers. The top row of straightening rolls has 4 rolls, and the bottom - 5 rolls. Moreover, the upper row of rolls has the possibility of inclined movements in the direction of passage of the processed material.

On this machine, sheets are processed in the range with a small difference in thicknesses, for example 5-25 mm.

The disadvantage of the machine is the narrow technological capabilities.

Also known is a sheet straightening machine according to the prospectus of SMS (W. Benz, U. Kaden, A. König. Warm - und kaltrichtmaschine für Grobbleche), Germany.

The machine contains 4 upper and 5 regular lower rolls mutually shifted by half a step between them and resting on groups of support rollers located along their length. The machine also contains pairs of installation wedges in an amount equal to the number of support rollers located in roller machines (cassettes), which in turn rely on transverse traverses.

Due to the presence of mechanisms for individual adjustment of the vertical positions of the leveling rolls by means of pairs of setting wedges, it becomes possible to mobilely change the machine from a nine-roller dressing scheme to a five-roll one, which allows to increase the bending radius of the processed sheets. The increase in radius is realized by changing the horizontal distances between the rollers II, V, VIII by removing the rolls from the dressing zone by moving the wedges brought by a group of individual settings hydraulic cylinders.

This machine allows you to edit sheets in a wider range of thicknesses, i.e. has wider technological capabilities compared to its counterpart. Figure 1 presents a diagram of the readjustment of the sheet straightening machine according to the prototype from 9-roller to 5-roller.

When implementing the “asymmetric” five-roller dressing scheme, the horizontal distances between the rollers I and II, VIII and IX (see figure 1) are 0.5t, and between the rollers II, V, VIII - 1.5t, where t is the pitch of the rolls.

Thin sheets are edited according to a nine-roll setting scheme, and thick sheets are made according to a five-roller, while in the process of processing thick sheets, the first and last correct rolls of the upper cassette perceive increased technological loads, which reduces the reliability and durability of these nodes and the whole machine.

In addition, when editing sheets of medium thicknesses, in order to achieve the required flatness parameters of the said sheets, it would be necessary to place the correct rolls at a closer distance from each other, less than 1.5t, since when processing sheets of medium thicknesses with rollers located at a distance of 1.5t It is not possible to provide the required quality of the strip.

Thus, the disadvantage of the prototype is the insufficient increase in reliability with unsatisfactory quality of the processed sheet material.

The basis of the invention is the task of improving the reliability of the sheet straightening machine while improving the quality of the processed strip.

The problem is solved due to the technical result, which consists in the rational redistribution of the bending forces applied to the correct rolls during processing according to the five-roller dressing scheme.

To achieve the above result, a sheet straightening machine comprising upper and lower cassettes installed in the frame, bearing the right drive rollers, arranged to move vertically, according to the invention is equipped with a mechanism for horizontal sliding of the lower cassette in the direction of passage of the processed metal, the drives of which are mounted on the bed, and the workers drive elements are made with the possibility of contacting with the lower cassette, in addition, the drives of the horizontal shift mechanism of the lower cassette sets in the direction of passage of the processed metal are made in the form of hydraulic cylinders.

The type of execution of the drive to solve the problem is not significant, therefore, made in the second paragraph of the formula. The drive can be made, for example, electromechanical or in the form of hydraulic cylinders. Preference is given to hydraulic cylinders as more reliable than a complex, multi-link (electric motor, gearbox, couplings, etc.) electromechanical drive.

As a result of a comparative analysis of the proposed solution with the prototype, it was found that they have the following common features:

- bed

- upper and lower cassettes,

- correct drive rolls mounted with the ability to move vertically;

and distinguishing features:

- the mechanism of horizontal shift of the lower cassette in the direction of passage of the processed metal,

- fixing the drives of the above mechanism on the frame,

- the implementation of the working bodies of the drives with the ability to contact with the lower cassette,

- the execution of the drives of the horizontal shift mechanism of the lower cartridge in the directions of passage of the processed material in the form of hydraulic cylinders.

Thus, the proposed design of the sheet straightening machine has new structural elements, new connections of nodes and parts.

Between the distinguishing features and the achieved technical result there is a causal relationship.

Due to the fact that the sheet straightening machine is equipped with a mechanism for horizontal sliding of the lower cassette in the direction of metal passage, the drives of which are fixed on the bed, and the working bodies of the drives made in the form of hydraulic cylinders are made with the possibility of contacting the lower cassette, it became possible to abandon the “asymmetric” sheet editing scheme with a five-roller setting, and implement a “symmetric” sheet straightening scheme by moving the lower cassette by 0.5t along the metal, followed by removal from the straightening zone of the rolls II, III, VI, VII, thereby eliminating the overload of the leveling rolls, redistributing rationally the working forces between the leveling rolls, by placing the leveling rolls horizontally at equal distances of 1t, which led to an increase in the reliability of leveling rolls and the whole sheet straightening machine as a whole .

In addition, reducing horizontal distances between rolls IV, V, VIII to 1t made it possible to improve the quality of straightening sheets in the entire range of thicknesses, including in the region of average sheet thicknesses.

The exclusion from the above set of distinctive features of at least one of the signs does not ensure the achievement of a technical result.

The claimed technical solution is not known from the prior art, because it is new.

The claimed technical solution has an inventive step, because the proposed design of a sheet straightening machine for a specialist does not explicitly follow from the prior art.

The claimed solution is industrially applicable, because its technical and technological performance is not difficult. By this decision, preliminary designs for sheet straightening machines of plate mills 2800 and 5000 of OJSC Severstal (Cherepovets) were completed.

Thus, the claimed decision can be granted legal protection, since it is new, has an inventive step and is industrially applicable, i.e. meets all the criteria of the invention.

The claimed solution is illustrated by drawings, which depict the following:

figure 1 - diagram of the readjustment of the correct sheet machine according to the prototype,

figure 2 - sheet straightening machine, side view,

figure 3 - section aa in figure 2,

Figures 4, 5, 6 are schematics of the readjustment of the sheet straightening machine from the nine-roll dressing scheme to the five-roll one.

The sheet straightening machine has a bed 1, consisting of four racks 2, rigidly connected to each other by means of the upper frame 3, as well as the cross-members of the upper 4 and lower 5. The upper cassette 6 is mounted on the upper cross-bar 4. The lower cassette 7 is arranged to move in the direction of movement the metal being machined on the lower cross member 5. The upper cross member 4 can be moved relative to the lower cross member 5 vertically from the hydraulic cylinders 8. In the lower cassette 7 there are mounting wedges 9 for individual adjustment of each of lkov 10, each of which has the ability to move from the drives (not shown conditionally). The composition of the pair of installation wedges 9 includes a wedge 11, which serves as a support for each of the right lower rollers 10 and the supporting rollers 12 supporting them. The correct upper rollers 13 and the supporting rollers have support on the wedges 15. Each of the wedges 15 is supported by the installation wedge 16, which in turn is located in the upper cartridge 6. Each installation wedge 16 has the ability to move along the axis of the support roller 13 from the drives (not shown in the drawings). The upper 13 and lower 10 straightening rolls have individual drives and are connected to them via articulated shafts (not shown in the drawings).

In the upper part of the frame 1 to the outer surfaces of the uprights 2 are attached hydraulic cylinders 17 of the sliding mechanism 18 of the lower cassette 7 (Fig.2). Moreover, their rods 19 of the hydraulic cylinders 17 are in contact with the frame of the lower cassette 7.

Sheet straightening machine operates as follows.

Depending on the thickness of the straightened sheets, two adjustment schemes can be implemented on the considered sheet straightening machine.

Tuning scheme 1 - nine-roller setting (figure 4).

Before applying a thin sheet to the machine, it is adjusted to the required clearance. In this case, the lower cassette 7 is installed in the extreme left position. Its horizontal movement along the base surface of the lower cross member 5 of the bed 1 is carried out using the rods of the hydraulic cylinders 17 of the sliding mechanism 18. In this case, the cassette 7 is pressed against the left posts 2 located on the metal inlet side. The cassette 6 is previously moved to its highest position using the upper cross member 4 of the hydraulic cylinders 8. Next, the vertical rolls 10, 13 are vertically installed in accordance with the dressing mode, for example, in the form of a wedge with an extension to the exit of the machine. The lower rolls 10 are installed due to the movements of the wedges 9, 11. The upper rolls 13 are installed due to the movements of the wedges 15, 16, as well as the upper cross member 4 and hydraulic cylinders 8. After setting the rolls 10, 13, the drive is turned on and the metal is fed into the machine. When passing through the machine, the straightened metal undergoes alternating bends relative to the rollers 10, 13 according to a nine-roller scheme with transferring the load from the dressing force to the support rollers 12, 14, wedges 9, 11, 15, 16, cassettes 6, 7 and cross-bars 4, 5.

Setting Scheme 2 - Five-roller setting for editing sheets of medium and large thicknesses.

Before feeding the sheet to the machine, the cartridge 6 is moved to the upper position using the cross member 4 and the hydraulic cylinders 8. Next, the lower cassette 7 is installed in the extreme right position (along the metal) by moving it horizontally along the base surface of the lower cross member 5 under the influence of the rods 18 of the hydraulic cylinders 16 slide mechanism 17. The cassette 7 is pressed against the right uprights 2 of the bed 1. At the same time, the upper rolls 13 (II, IV, VI, VIII) and the lower 10 (I, III, V, VII) are installed opposite, i.e. with the placement of the axes of the pairs of upper and lower rolls in the same plane (figure 5). Next, the vertical installation of the rolls 10, 13 is carried out in accordance with the specified editing mode. The lower rolls 10 (I, III, IX) are installed due to the movements of the wedges 9, 11. The upper rolls 13 (IV, VIII) are installed due to the movements of the wedges 15, 16, as well as the upper cross member 4 and hydraulic cylinders 8. Rolls 10, 13 ( II, VI, III, VII) by means of wedges 9, 11, 15, 16 are discharged from the editing zone (Fig.6). After completion of operations related to the setting, the drive is turned on and metal is fed into the machine. When passing through the machine, the straightened metal undergoes alternating bends relative to the rollers 10, 13 (I, IV, V, VIII, IX) according to a five-roller scheme with transfer of the load from the dressing force to the corresponding support rollers 12, 14, wedges 9, 11, 15, 16 , cassettes 6, 7 and cross members 4, 5.

From the foregoing, we can conclude that the implementation of the sheet straightening machine in accordance with the design given in the formula allows us to eliminate the overload of the right rolls, rationally distribute the working effort between the right rolls, which increases the reliability of the straight rolls and the sheet straightening machine as a whole.

In addition, the use of a “symmetric” dressing scheme for five-roll adjustment with a horizontal distance between the right rolls equal to 1t allows you to create optimal technological parameters of bending, in particular for sheets of medium thickness, which improves the quality of the processed metal products.

Claims (2)

1. The sheet straightening machine, containing the upper and lower cassettes installed in the frame, bearing the correct drive rollers, arranged to move vertically, characterized in that it is equipped with a mechanism for horizontal sliding of the lower cassette in the direction of passage of the processed material, the drives of which are mounted on the bed, and working bodies of the drives are made with the possibility of contacting with the lower cassette. 2. The sheet straightening machine according to claim 1, characterized in that the drives of the horizontal shift mechanism are made in the form of hydraulic cylinders.

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