RU2401707C2 - Roll mill stand and rolling device - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to roll mill stand and roll mil for production of multiface profiles. Proposed stand comprises at least three rolls fitted their axles arranged in one plane. Note here that roll axles are arranged at over 0 and less than 180 degrees at each other. Note also that each roll has round work surface and, together, the rolls form a gage. Work surface of at least one roll features invariable shape that has in its cross section in axial plane at least one plain section parallel to axis and one inclined section running at over 0 at less than180° to said plain section adjoining to the latter and directed outward from plain section relative to axle. Roll mill has at least two roll stands. Note here that aforesaid plain section of the first stand features width different from that plain section of the second stand roll.

EFFECT: reduced deviation from preset hexagonal shape.

18 cl, 8 dwg

Description

The invention relates to a rolling stand with at least three rolls arranged substantially in the same plane, respectively mounted axially, the axes carrying the rolls being offset by an angle greater than 0 ° and less than 180 ° to each other, and each roll has a rotating working surface, and the working surfaces together form a caliber. The invention further relates to a rolling device for rolling with several rolling stands. Such rolling stands and similar rolling devices find application in the rolling of multifaceted rolled products, in particular for hexagonal profiles.

A rolling stand for rolling a hexagonal product is known from practice, which has three located essentially in the same plane, respectively mounted on the axis of the roll, the axes carrying the rolls being offset by an angle of more than 0 ° and less than 180 ° to each other, and each roll has a circular working surface, and the rolls together make up the caliber (the so-called 3-roll system). In this case, the gauge refers to the shape and size of the hole between the rolls of the rolling fixture.

The known rolling stand has rolls with smooth working surfaces that are located relative to each other so that in each subsequent stand one after the other, respectively, to three sides of the material, which are oriented to each other at an angle of 120 °, is given a uniform shape. In the last stand, deformation occurs in such a way that the average diameter in the middle of the even sides becomes the same. As a result, a hexagon is formed in the 3-roll stand. A rolling device with similar rolling stands has the disadvantage that with a large ovality of the output product, the “turnkey” size difference of the final product is large, and the “turnkey” size is the distance between two parallel passing sides of the hexagonal profile.

In addition, it is known that for rolling the hexagonal product a rolling stand with two rolls is provided, which are mounted on axes running parallel to each other and accordingly have a circular working surface, and the working surfaces together form a gauge (the so-called duo cage). The working surface of both rolls has an unchanged contour, which in the axial plane has a straight section parallel to the axis and an inclined section adjacent to both sides of the flat section, the free angle between the flat section and the inclined section is 120 °, and the inclined section is directed outward from the flat section outward from the axis . By arranging both rolls to each other, the working surfaces limit the deformation zone almost completely and give it the shape of a hexagonal product to be rolled. The disadvantage of this arrangement is the problem of sharp edges. Here, the edges between the flat section and the inclined section must be obtained very accurately, then an acceptable edge of the final product can be obtained. In addition, a disadvantage in such a device is that the constantly remaining gap between adjacent end sections of the contours of both rolls can leave visible traces on the hexagonal product, which make subsequent processing necessary. With increasing wear, especially at the edge between flat areas or clogging of this area by means of contaminants coming from the surface of the rolled rod (for example, scale), the sharpness of the edges is broken.

Based on the prior art, the invention is based on the task of significantly reducing deviations from the given shape of the rolling product associated with input ovality.

This problem is solved by means of a rolling stand according to paragraph 1 of the claims, as well as by means of a rolling device according to paragraph 8 of the claims. Preferred embodiments are indicated in the dependent claims.

The invention is based on the idea that the rolled product is centered by means of an embodiment of the working surface in the rolling stand or in the rolling device, thereby achieving a noticeable reduction in deviation from the desired shape.

This is particularly achieved due to the fact that the working surface of at least one roll of the rolling stand according to the invention has an unchanged contour, which has in one plane, which also contains axes (axial plane), on which the rolls are installed, at least one a straight section parallel to the axis and passing at an angle greater than 0 ° and less than 180 ° to a flat section adjacent to an even section and directed from an even section relative to the axis outwardly. This inclined section leads to the desired centering that in conventional rolling stands with rolls that have only one flat section, therefore have no contour, is not provided.

In a preferred embodiment, the angle between the inclined portion and the flat portion is 120 °. The experiments showed that using similar geometry of the working surface, hexagonal products are made especially well and with a slight difference in turnkey size. Moreover, the orientation of the inclined section relative to a flat section contributes to the preliminary molding of the rolled product into a hexagonal product.

In order to better fill the caliber without the risk of rolling, according to a further, particularly preferred embodiment, a contour is provided with a narrow, even region that is slightly wider than the dimensional hexagon to be rolled, and with even tangents at, if possible, a large angle that makes at least 120 °, particularly preferably 140 °. Particularly preferably, the angle is maximum 160 °.

In a preferred embodiment, the inclined portion may be located on both sides of the flat portion. Depending on the installation conditions and the geometry of the incoming product, it is entirely possible to achieve the advantages of the invention with one even section and an adjacent inclined section.

The rolling stand according to the invention, however, is universal, therefore, an inclined section is provided at both ends of the flat section, then the centering errors in both directions can be corrected.

In a preferred embodiment, the transition from a flat section to an inclined section has a fillet. In this way, problems with edge sharpness during processing can be avoided. The transition from a flat section to an inclined section does not then contribute to the formation of a sharp edge. This occurs through a sequence of orientations of the corresponding flat sections of the rolls in the following stands. Alternatively, the transition from a flat section to an inclined section in a further embodiment may be made as a sharp edge.

When using the rolling stand according to the invention in a rolling device, preferably with at least two similar rolling stands, it has been found that the flat roll section of the first rolling stand has a different width than the flat roll section of the second rolling stand. Particularly preferably, the flat roll section of the first rolling stand may have a larger width than the flat roll section of the second rolling stand.

Thus, it can be achieved that without changing the rolls, hexagons of various sizes can be obtained. The minimum width of the even area of all the rolls then corresponds to at least the side length of the maximum hexagon that can be rolled.

Also, in the rolling device with at least two rolling stands according to the invention, the angle between the flat section of the first roll and its inclined section may differ from the free angle between the flat section of the second roll and its inclined section. Particularly preferably, the angle at the rolls of the first stand is selected to be larger than the angle at the rolls of the second stand. For example, the angle at the rolls of the first stand can be 160 °, while the angle at the rolls of the next rolling stand can be, for example, 120 °.

Particularly good results are achieved when reducing the width of a flat area and reducing the free angle, as described above, as separate measures, combined in a rolling device with at least two rolling stands according to the invention.

In a preferred embodiment, the rolling device, with rolling stands according to the invention, is configured for a multifaceted rolled product that will be rolled so that in the last rolling stand the rolled product no longer comes into contact with the inclined section, but exclusively interacts with a flat section of the roll. This prevents a problem with the transition region between the flat section and the inclined section of the rolls.

The centering of the incoming rolled product and the associated reduction in ovality in the rolling device according to the invention, for rolling, for example a multifaceted or round rolled product, is achieved using several rolling stands, of which the first rolling stand has at least three located essentially on the same plane respectively mounted on the axis of the roll, and the axes carrying the rolls are located at an angle of more than 0 ° and less than 180 ° to each other, and each roll has a rotating working surface, and whose surfaces together constitute a caliber, and the working surface of at least one roll has a contour that is made in a plane containing axes carrying rolls (axial plane), in cross section in the form of a recess.

A particular embodiment of such a recess may be the previously described contour of the roll of the rolling stand according to the invention with a flat section and inclined sections adjacent on both sides to a flat section. According to the invention, the reduction of ovality in the first stand, however, is achieved not only through a similar contour. For centering, the execution of a contour in the form of a notch is enough. In this case, the recess in the cross section must be round, therefore, has a radius that remains unchanged (round section). Also, the recess can be made at its base in the form of an arc section and goes to the edges in directly passing inclined sections (tangent sections). Also, the contour in the form of a recess at its base has a smooth section, at the ends of which arc sections are provided, if necessary, with curves varying along the arc section. These other possible possibilities are depicted by embodiments of the rolling device according to the invention, the core of which forms a recess in the form of at least one roll of the first rolling stand, thereby achieving an effect that reduces ovality and, therefore, centering.

In a preferred embodiment of the rolling device according to the invention, at least one additional rolling stand is located immediately after the described rolling stand. This can be a rolling stand according to the invention or a rolling stand with traditional flat rolls that have only a flat section. Can also optionally follow - according to the invention or traditional - rolling stands.

The rolling stand according to the invention and the rolling device according to the invention can be used for rolling, reducing ovality, round or multifaceted products. Particularly preferably, they are used for rolling hex profiles.

The invention is further explained by means of drawings serving as embodiments. These drawings do not cover the entire number of possible embodiments.

The drawings show:

figure 1 - the location of the rolls in a rolling mill for rolling products on a schematic top view;

figure 2 - rolls of a rolling stand according to the invention in cross section;

figure 3, 4, 5 and 6 are the contours of the working surfaces of the rolls according to figure 2 in cross section;

figa, 7b, 7c, 7d is a sequence of possible contours of the working surfaces of the rolls following one after another rolling stands in a schematic view from above and

FIG. 8a, 8b is a depiction of the filling of the caliber between the contours of the rolls of successive rolling stands in a schematic top view.

Figure 1 shows a rolling stand for rolling rolled products with three rolls 1, 2, 3 located essentially in the same plane, each of which are respectively mounted on the same axis 4, 5, 6, the roll axes being at an angle of 60 ° to each other each other, and each roll has a circular working surface 7, 8, 9, and the working surfaces 7, 8, 9 together make up gauge 15. The drives 100, 101 and 102 drive the rolls 1, 2, 3. The stand 104 carries the drives 100, 101, 102 and - through their axes 4, 5, 6 - rolls 1, 2, 3.

In Fig. 2, it is explained that the working surface 7 of the roll 1 has an unchanged contour, which has a plane section 10 parallel to the axis in the plane containing axis A and correspondingly inclined section 11, 12 adjacent to it at the end of the level section 10. The inclined section 11, 12 extends at an angle of 140 ° to the axis and is directed from the flat section 10 outward relative to the axis. The transitions 13, 14 from the flat section 10 to the inclined section 11, 12 may not have close to the shown fillets, therefore, made rounded.

Figures 3, 4, 5, 6 show the ovality-reducing and centering contours that may have, for example, rolls of a first rolling stand of a rolling device with several rolling stands, which should be made in the axial plane in cross section in the form of a recess. Figure 3 shows an embodiment of the contour in the form of a circular section 20 with a radius R. Figure 4 shows a contour in the form of a recess with a circular section 21 made at the base with a radius R, in which inclined sections 22 directly extending adjacent to the circular section are provided, 23 (tangent sections).

Figure 5 shows a contour with a flat section 24 provided at the base and two inclined sections 25, 26 adjacent to a flat section, and the transition of a flat section 24 to the inclined sections 25, 26 is provided with a rounding with a radius R.

Fig. 6 shows a contour with an even section 27 provided at the base of the recess and adjacent arc sections 28, 29 with radii R1 and R2 varying with respect to the arc section. The above radii can be replaced by curves of the corresponding stroke.

7, in parts a, b, c, d, various contours of the working surface are shown. The sequence depicted in Fig. 7 illustrates the selection of the contour of the working surface of the rolls of rolling stands following each other. Thus, it should be clarified that the contour of the working surface inserted in the first stand (Fig. 7a) has a wider, even section 31 than the flat section 41, 51, 61 of the contours of the working surface of the roll of the second stand (Fig. 7b), of the third stand (Fig. ) and the fourth stand (Fig.7d). In addition, it should be clarified that the free angle between the flat section 31 and adjacent inclined sections 32 and 33 is greater than the free angle between the flat sections 41, 51, 61 and adjacent inclined sections 42, 43 or 52, 53, or 62, 63.

On Fig shows the effect of the contour of the working surface according to the invention on the centering of the product coming in with ovality. In FIG. 8a, it is explained that the inclined sections 72, 73 adjacent to the flat section 71 lead to its central support, while the flat section 71 already contributes to the first edge of the hexagon. On fig.8b shows the preferred location of the hexagonal product in the contour of the working surface of the roll of the last stand. Preferably, this contour is selected so that the rolled product is rolled exclusively by means of a flat section and there is no contact between the flat product and the inclined section.

Claims (18)

1. A rolling stand with at least three rolls (1, 2, 3) located essentially in the same plane and respectively mounted each on the same axis (4, 5, 6), the axes being (4, 5, 6 ) rolls (1, 2, 3) are located at an angle of more than 0 ° and less than 180 ° to each other, and each roll has a circular working surface (7, 8, 9), and the working surfaces together comprise a caliber (15), characterized in that the working surface (7, 8, 9) of at least one roll has an unchanged contour, which in cross section in the axial plane has at least one parallel the axis axis is a flat section (10, 24, 31, 41, 51, 61, 71) and one inclined section (11, 12, 25, 26, 32, 33, 42, 43, 52, 53, 62, 63, 72, 73), passing at an angle of more than 0 ° and less than 180 ° to a flat area (10, 24, 31, 41, 51, 61, 71), adjacent to a flat area (10, 24, 31, 41, 51, 61, 71 ) and directed relative to the axis (4, 5, 6) outward from the flat area (10, 24, 31, 41, 51, 61, 71). 2. The rolling stand according to claim 1, characterized in that the angle between the inclined section (11, 12, 25, 26, 32, 33, 42, 43, 52, 53, 62, 63, 72, 73) and the flat section ( 10, 24, 31, 41, 51, 61, 71) is at least 120 °. 3. The rolling stand according to claim 1, characterized in that on both sides of the flat section (10, 24, 31, 41, 51, 61, 71) there is an inclined section (11, 12, 25, 26, 32, 33, 42 , 43, 52, 53, 62, 63, 72, 73). 4. A rolling stand according to one of claims 1 to 3, characterized in that the transition from a flat section (10, 24, 31, 41, 51, 61, 71) to an inclined section (11, 12, 25, 26, 32, 33, 42, 43, 52, 53, 62, 63, 72, 73) has a fillet (13, 14), which is made along a radius or other suitable curve. 5. A rolling device with at least two rolling stands according to one of claims 1 to 4, characterized in that the flat section (31) of the roll of the first rolling stand has an excellent width from the flat section (41) of the roll of the second stand. 6. A rolling device with at least two rolling stands according to one of claims 1 to 4, characterized in that the angle between the flat section (31) of the roll of the first rolling stand and its inclined sections (32, 33) is different from the angle between an even section (41) of the roll of the second rolling stand and its inclined sections (42, 43). 7. The device according to claim 6, characterized in that the flat section (31) of the roll of the first rolling stand has an excellent width from the flat section (41) of the roll of the second rolling stand. 8. A rolling device with several rolling stands, characterized in that the first rolling stand (104) has at least three rolls located essentially on the same plane, each mounted on the same axis (4, 5, 6) ( 1, 2, 3), and the axes (4, 5, 6) of the rolls (1, 2, 3) are located at an angle of more than 0 ° and less than 180 ° to each other, and each roll (1, 2, 3) has a circular the working surface, and the working surfaces (7, 8, 9) together comprise a caliber (15), in which the working surface (7, 8, 9) of at least one roll (1, 2, 3) has an unchanged contour p, which is adapted in cross-section in the axial plane of the recess. 9. The device according to claim 8, characterized in that the contour has at least one plane section parallel to the axis (10, 24, 31, 41, 51, 61, 71). 10. The device according to claim 8 or 9, characterized in that the circuit has at least one inclined section extending outward relative to the axis at an angle of more than 0 ° and less than 180 ° to the axis. 11. The device according to claim 10, characterized in that the circuit has a circular section (21) located between two inclined sections (22, 33). 12. The device according to claim 9, characterized in that the circuit has an arc section (28, 29) adjacent to a flat section (27), which is directed outward relative to the axis. 13. The device according to claim 8, characterized in that it further comprises a rolling stand according to one of claims 1 to 4. 14. The device according to claim 8, characterized in that it further comprises one or more rolling stands, the rolls of which have only a flat area. 15. The use of a rolling stand according to one of claims 1 to 4 for rolling a multifaceted product of hire. 16. The use of a rolling stand according to one of claims 1 to 4 for rolling a hexagonal profile. 17. The use of a rolling device according to one of paragraphs.5-7 or 8-14 for rolling a multifaceted rental product. 18. The use of rolling fixtures according to one of claims 5-7 or 8-14 for rolling the hexagonal profile.

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