Horizontal roll and method for adjusting width of horizontal roll

Abstract

In this horizontal roll, a sleeve roll is provided with a first hole part extending in the axial direction, an intermediate sleeve is provided with a second hole part extending in the axial direction, the sleeve roll and the intermediate sleeve are fastened together by fixing bolts housed in the first hole part and the second hole part, the sleeve roll is provided with a first bolt hole part penetrating the same in the axial direction, separately from the first hole part, and a lateral surface of the intermediate sleeve is disposed at the bottom surface section of the first bolt hole part in the axial direction.

Description

Horizontal roll and how to adjust the width of the horizontal roll

[0001] The present invention relates to a horizontal roll and a method for adjusting the width of the horizontal roll.

[0002] Conventionally, sectional steel, such as H-section steel, has usually been rolled using a universal rolling mill. A universal rolling mill is a rolling mill equipped with a pair of upper and lower horizontal rolls whose axes extend horizontally and a pair of left and right vertical rolls whose axes extend perpendicular to the axes of the horizontal rolls. The universal rolling mill rolls sectional steel by simultaneously rolling down the web of the rolled material from above and below with the pair of horizontal rolls and rolling down the flange of the rolled material with the side surfaces of the pair of vertical rolls and the pair of horizontal rolls.

[0003] For example, Patent Document 1 discloses a width-adjustable rolling roll that can adjust the roll width (width in the direction in which the axis extends) offline. More specifically, the width-adjustable rolling roll includes a roll shaft, an annular sleeve, and a split spacer. The roll shaft is provided with a rib-shaped protrusion in the center and spline portions on both sides. The annular sleeve fits into the spline portions. The split spacer is disposed between the annular sleeve and the rib-shaped protrusion. A split spacer and annular sleeve are provided on both sides of the rib-shaped protrusion. The annular sleeve, the split spacer, and the rib-shaped protrusion are fastened together with bolts and nuts.

[0004] Furthermore, for example, Patent Document 2 discloses a horizontal roll device with variable barrel width that automatically adjusts the roll width online.

[0005] Japanese Utility Model Application Publication No. 51-86728 Japanese Patent Application Publication No. 2013-151011

[0006] In the rolling roll of Patent Document 1, the roll width can be adjusted by replacing the divided spacers. However, when replacing the divided spacers, it is necessary to release the fastening of the bolts and nuts and move the annular sleeve outward to widen the gap between the annular sleeve and the rib-like protrusions, which is not an easy task.

[0007] Furthermore, the horizontal roll device disclosed in Patent Document 2 has a very complicated mechanism, which poses a problem of high costs for manufacturing the rolls and for maintenance during use.

[0008] In view of the above circumstances, an object of the present invention is to provide a horizontal roll that can easily adjust the width and can reduce costs.

[0009] One aspect of the present invention is a horizontal roll used in universal rolling of structural steel, comprising: a roll shaft extending in the axial direction; an intermediate sleeve arranged radially outward of the roll shaft and having an outer diameter larger than the diameter of the roll shaft; and a pair of sleeve rolls arranged on the left and right sides of the intermediate sleeve in a state fitted onto the roll shaft, the left and right sides forming a pair, wherein the sleeve roll has a first hole portion extending in the axial direction, the intermediate sleeve has a second hole portion extending in the axial direction, the sleeve roll and the intermediate sleeve are fastened together by fixing bolts housed in the first hole portion and the second hole portion, the sleeve roll has a first bolt hole portion extending axially in addition to the first hole portion, and the side of the intermediate sleeve is arranged at the axial bottom portion of the first bolt hole portion (first configuration).

[0010] Furthermore, the first configuration may have a width adjustment bolt that is housed in the first bolt hole portion and has a tip portion that can come into contact with a side surface of the intermediate sleeve (second configuration).

[0011] In the second configuration, the first bolt hole portion may be provided with a threaded hole that can be threadably coupled with the width adjustment bolt (third configuration).

[0012] Furthermore, in the second configuration, a spacer may be provided that is axially sandwiched between the intermediate sleeve and the sleeve roll, the spacer being provided with a second bolt hole portion capable of accommodating the width adjustment bolt, and the second bolt hole portion being provided with a threaded hole that can be threadedly coupled to the width adjustment bolt (fourth configuration).

[0013] Furthermore, in any of the first to fourth configurations, a spacer and / or a width adjustment shim may be provided that is axially sandwiched between the intermediate sleeve and the sleeve roll, and the spacer and / or the width adjustment shim may be fastened together with the sleeve roll and the intermediate sleeve by the fixing bolt (fifth configuration).

[0014] In the fifth configuration, the spacer and / or the width adjusting shim may be separable (sixth configuration).

[0015] Another aspect of the present invention is a width adjustment method for adjusting the roll width of a horizontal roll having any of the first to sixth configurations described above, including: a first step of releasing the fastening of the fixing bolt; and a second step of, after the first step, moving the sleeve roll axially outward by pressing the width adjustment bolt axially inward while contacting the tip of the width adjustment bolt housed in the first bolt hole portion with the side of the intermediate sleeve (seventh configuration).

[0016] According to the present invention, width adjustment can be easily performed and costs can be reduced.

[0017] Fig. 1 is a diagram showing the cross-sectional shape of an H-beam. Fig. 2 is a schematic diagram of finish universal rolling of a general H-beam. Fig. 3 is a diagram showing an overview of universal rolling using horizontal rolls according to an embodiment of the present disclosure. Fig. 4 is a diagram showing a more specific configuration of the horizontal roll according to this embodiment. Fig. 5 is a side view of a sleeve roll as viewed in the axial direction. Fig. 6 is a side view of a spacer or shim as viewed in the axial direction.

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of component parts to the following embodiments. Also, the drawings are schematic. Therefore, it should be noted that the relationships and ratios between thicknesses and planar dimensions differ from the actual ones, and the drawings also include portions where the relationships and ratios of dimensions differ from each other.

[0019] <Outline of H-shaped steel and rolling manufacturing method thereof> In this embodiment, a rolling manufacturing method of an H-shaped steel will be described as an example of shaped steel. FIG. 1 is a diagram showing the cross-sectional shape of an H-shaped steel. As shown in FIG. 1, the H-shaped steel 1 has a uniform H-shaped cross-sectional shape perpendicular to the longitudinal direction. The H-shaped steel 1 has a web 11 and a pair of flanges 12. The web 11 is a portion extending in the left-right direction. The pair of flanges 12 are portions connected to both left-right ends of the web 11 and extending in the up-down direction.

[0020] The cross-sectional shape of H-beams is formed through the processes of rough rolling, intermediate rolling, and finish rolling, using slabs, blooms, beam blanks, etc. as rolling materials. Of these rolling processes, the intermediate rolling and finish rolling use a rolling method called universal rolling.

[0021] Figure 2 shows a schematic diagram of a typical finish universal rolling process for H-shaped steel. In universal rolling, rolling is performed using a pair of horizontal rolls 2 (top and bottom) and a pair of vertical rolls 3 (left and right). The horizontal rolls 2 rotate around an axis C1 extending in the left-right direction. The vertical rolls 3 rotate around an axis C2 extending in the up-down direction. The outer peripheral surfaces of the pair of horizontal rolls 2 reduce the thickness of the web 11 of the H-shaped steel 1, and the outer peripheral surfaces of the pair of vertical rolls 3 and the side surfaces of the pair of horizontal rolls 2 reduce the thickness of the flange 12 of the H-shaped steel 1.

[0022] Due to this rolling method, the web inner width W1 (Fig. 1) of the universally rolled H-section steel 1 is affected by the roll width Wr (Fig. 2) of the horizontal rolls. Note that Fig. 1 also shows the definitions of the web height W2 and flange width F1.

[0023] The web height W2 and inner web width W1 of the H-beam 1 have dimensional tolerance ranges. Therefore, as the rolling of many H-beams 1 progresses and the side surfaces of the horizontal rolls 2 begin to wear, it becomes possible that these dimensional tolerance ranges will no longer be met. Conventionally, when roll wear progresses in this way, the worn portions are reworked and the roll shape is restored by reducing the width (downsizing) and converting the rolls into horizontal rolls for manufacturing H-beams with smaller web heights W2. This has led to issues such as a worsening roll consumption rate and the need to maintain a large number of horizontal rolls. To solve these issues, technology that allows the roll width of the horizontal rolls to be adjusted is important.

[0024] <Structure of Horizontal Roll> Next, the structure of the horizontal roll 2 according to an embodiment of the present disclosure will be described. Fig. 3 is a diagram showing an overview of universal rolling using the horizontal roll 2 according to an embodiment of the present disclosure. Note that Fig. 3 shows the case of finish universal rolling. The horizontal roll 2 according to this embodiment has a pair of sleeve rolls 21 on the left and right. As shown in Fig. 3, the pair of sleeve rolls 21 roll down the left and right widthwise portions 11A of the web 11. Because a space SP is provided in the area sandwiched between the outer peripheral ends of the pair of sleeve rolls 21 in the left-right direction, the central portion 11B of the web 11 in the widthwise direction is not directly rolled down by the horizontal roll 2.

[0025] In this embodiment, if wear progresses on the sides of the left and right sleeve rolls 21, the roll width Wr can be adjusted to the desired value by adjusting the left-right spacing SS between the left and right sleeve rolls 21 in accordance with the wear.

[0026] Figure 4 is a diagram showing a more specific configuration of the horizontal roll 2 according to this embodiment. The horizontal roll 2 shown in Figure 4 rotates around an axis C1. Hereinafter, the direction in which the axis C1 extends will be referred to as the axial direction. The axial direction is the same as the left-right direction. The direction around the axis C1 will be referred to as the circumferential direction, and the direction perpendicular to the axis C1 will be referred to as the radial direction.

[0027] The horizontal roll 2 has a roll shaft 20, a pair of sleeve rolls 21 in the left-right direction, and an intermediate sleeve 22. For convenience, Fig. 4 shows the configuration of the sleeve roll 21 in two states: State A when the sleeve roll 21 is purchased, and State B when the sleeve roll 21 has worn out. In State A, the horizontal roll 2 has a spacer 23, and in State B, it has a shim 24 in addition to the spacer 23.

[0028] The roll shaft 20, also called an arbor, extends in the axial direction. The intermediate sleeve 22 has an annular shape when viewed in the axial direction, and is fitted to the axial center of the roll shaft 20. The intermediate sleeve 22 is fixed to the roll shaft 20 by shrink fitting. However, this is not limiting, and for example, the intermediate sleeve 22 and the roll shaft 20 may be molded integrally.

[0029] The pair of sleeve rolls 21 are annular in shape when viewed in the axial direction and are arranged on the left and right sides of the intermediate sleeve 22 while fitted onto the roll shaft 20. The outer diameter D2 of the sleeve roll 21 is larger than the diameter D1 of the roll shaft 20 and the outer diameter D3 of the intermediate sleeve 22. FIG. 5 is a side view of the sleeve roll 21 as viewed in the axial direction. The sleeve roll 21 has a fitting hole 211 centered on the axis C1. The roll shaft 20 is fitted into the fitting hole 211. The fitting hole 211 has multiple accommodating portions 212 formed at equal intervals in the circumferential direction. The accommodating portions 212 are recessed radially outward. Corresponding to each of the accommodating portions 212, multiple key grooves 201 recessed radially inward are provided at equal intervals in the circumferential direction on the outer circumferential surface of the roll shaft 20 ( FIG. 4 ). As a result, a key (not shown) is arranged between the key groove 201 and the accommodating portion 212. The sleeve roll 21 is movable in the axial direction via the key attached to the roll shaft 20. Furthermore, the rotational torque of the roll shaft 20 is transmitted to the sleeve roll 21 via a key.

[0030] As shown in Figures 4 and 5, the sleeve roll 21 is provided with through-holes 213A and 213B. The through-holes 213A and 213B are formed to extend in the axial direction. The through-hole 213A can accommodate a nut 25 and a spacer 28. The through-hole 213B can accommodate the head side of the fixing bolt 26. The intermediate sleeve 22 is provided with a through-hole 221. The through-hole 221 is formed to extend in the axial direction. The fixing bolt 26 can be accommodated in the through-hole 221. The fixing bolt 26 is inserted from the through-hole 213B side.

[0031] In addition, it is also possible to provide screw holes on the left and right side surfaces of the intermediate sleeve 22, insert two fixing bolts into the through-hole portions of the left and right sleeve rolls 21, screw the tips of the fixing bolts to the intermediate sleeve 22, and fix the sleeve roll 21 with the heads of the fixing bolts.

[0032] The spacer 23 and the shim 24 are width adjustment members and are plate-like members having a thickness in the axial direction. The spacer 23 and the shim 24 are each annular when viewed in the axial direction and are fitted onto the roll shaft 20. The outer diameter D3 of the spacer 23 and the shim 24 is larger than the diameter D1 of the roll shaft 20 and smaller than the outer diameter D2 of the sleeve roll 21.

[0033] The fixing bolt 26 passes through the intermediate sleeve 22 and the spacer 23 in the axial direction and is fastened to the nut 25. A spacer 28 is disposed between the axial bottom of the through-hole portion 213A and the nut 25. This fastens the sleeve roll 21, the intermediate sleeve 22, and the spacer 23 together. When the shim 24 is also used, the fixing bolt 26 passes through the intermediate sleeve 22, the spacer 23, and the shim 24 in the axial direction and is fastened to the nut 25. This fastens the sleeve roll 21, the intermediate sleeve 22, the spacer 23, and the shim 24 together.

[0034] In the example shown in Fig. 5, a pair of through holes 213A and a pair of through holes 213B are provided in the sleeve roll 21. The through holes 213A and 213B are arranged on the same circle CR centered on the axis C1. The pair of through holes 213A and the pair of through holes 213B are arranged diagonally opposite each other. As a result, two fixing bolts 26 are inserted from the through hole 213B side of one sleeve roll 21, and the other two fixing bolts 26 are inserted from the through hole 213B side of the other sleeve roll 21. In other words, a total of four fixing bolts 26, i.e., multiple fixing bolts 26, are used.

[0035] 4 and 5 , the sleeve roll 21 is provided with bolt hole portions 214 that penetrate in the axial direction, separate from the through-hole portions 213A and 213B. The bolt hole portions TH of the spacer 23 and the shim 24 are axially connected to the bolt hole portions 214. When viewed in the axial direction, the side surface of the intermediate sleeve 22 is located at the bottom of the bolt hole portions 214. In other words, the holes that penetrate through the bolt hole portions 214 and the bolt hole portions TH do not penetrate the intermediate sleeve 22.

[0036] A threaded hole is formed in the bolt hole portion 214. This allows the width adjustment bolt 27 inserted into the bolt hole portion 214 to be screwed into the threaded hole of the bolt hole portion 214. When the width adjustment bolt 27 screwed into the bolt hole portion 214 is pushed inward in the axial direction, the tip of the width adjustment bolt 27 can be brought into contact with the intermediate sleeve 22.

[0037] When the fixing bolts 26 and nuts 25 are loosened (released), the width adjustment bolts 27 are pushed in while in contact with the intermediate sleeve 22, causing the sleeve roll 21 to move axially outward. This allows a gap to be created between the sleeve roll 21 and the spacers 23 or shims 24. Therefore, when replacing the spacers 23 or inserting the shims 24 to adjust the roll width, the work of creating the gap becomes easy.

[0038] Furthermore, when the width adjustment bolts 27 are pushed in and pressed against the intermediate sleeve 22 with the fixing bolts 26 and nuts 25 fastened, it is also possible to prevent the fixing bolts 26 from loosening when the horizontal rolls 2 are in use. Note that the width adjustment bolts 27 do not necessarily have to be inserted into the bolt hole portions 214 when rolling using the horizontal rolls 2.

[0039] 5, four bolt holes 214 are provided, and are spaced equally apart in the circumferential direction. A width adjustment bolt 27 is inserted into each bolt hole 214. The four bolt holes 214, the two through holes 213A, and the two through holes 213B are arranged at equal intervals in the circumferential direction on the same circle CR. In other words, adjacent holes in the circumferential direction are spaced at 45-degree intervals.

[0040] FIG. 6 shows a side view of the spacer 23 or the shim 24 as viewed in the axial direction. The spacer 23 or the shim 24 has a fitting hole HA centered on the axis C1. The roll shaft 20 is fitted into the fitting hole HA. The spacer 23 or the shim 24 can be divided into two along a parting line L. The fitting hole HA is provided with recesses RE that are recessed outward in a direction perpendicular to the parting line L and are symmetrical with respect to the parting line L. The four recesses RE are arranged on the same circle CR2 centered on the axis C1. A fixing bolt 26 can be passed through the recesses RE. The spacer 23 or the shim 24 may be divided into three or more pieces.

[0041] Furthermore, bolt holes TH are provided in the spacer 23 or the shim 24 in correspondence with the bolt holes 214. The four bolt holes TH are arranged on the same circle CR2. As described above, width adjustment bolts 27 can be passed through the bolt holes TH.

[0042] <Width Adjustment Method> Here, a more detailed description will be given of the width adjustment method using the horizontal roll 2 configured as described above. First, when purchasing the sleeve roll 21, spacers 23 corresponding to the desired size of H-section steel are placed on both axial sides of the intermediate sleeve 22, and the pair of spacers 23 are sandwiched between the pair of sleeve rolls 21 and the intermediate sleeve 22. Then, fixing bolts 26 are inserted into the through-holes 213A, 213B and fastened to the nuts 25 to produce a horizontal roll 2 with the desired roll width (state A in FIG. 4 ). At this time, by pushing the width adjustment bolts 27 axially and pressing them against the intermediate sleeve 22, loosening of the fixing bolts 26 can be suppressed.

[0043] As rolling progresses and wear on the side surfaces of the sleeve roll 21 progresses, the fixing bolts 26 are loosened offline, and the width adjustment bolts 27 are pushed in while in contact with the intermediate sleeve 22, thereby creating a gap between the sleeve roll 21 and the spacers 23. The width adjustment bolts 27 are then removed from the horizontal rolls 2, or pulled out to a position where they do not interfere with the gap, and a shim 24 is inserted into the gap. Since the shim 24 is divided into two at a parting line L as shown in Figure 6, the shim 24 can be inserted without pulling out the fixing bolts 26 from the horizontal roll 2. The fixing bolts 26 are then tightened to the nuts 25, thereby producing a horizontal roll 2 adjusted to the desired roll width (state B in Figure 4).

[0044] When using the spacer 23 on an H-beam with a different web inner width W1, the spacer 23 is replaced. Width adjustment according to wear on the sleeve roll 21 is performed by inserting a shim 24. The shim 24 has a smaller width adjustment unit than the spacer 23, allowing for fine width adjustment. For example, the width adjustment unit of the spacer 23 is 50 mm, and the width adjustment unit of the shim 24 is 0.1 mm. In this case, when downsizing the H-beam, the spacer 23 can reduce the width by 50 mm.

[0045] In addition, if the sleeve roll 21 is worn, a shim 24 is inserted to make the width of the roll slightly larger than the desired width, and the sleeve roll 21 is re-machined and finished using a roll lathe, thereby enabling the roll surface to be finished with high precision.

[0046] As described above, according to the horizontal roll 2 of this embodiment, the sleeve roll 21 can be easily moved in the axial direction by using the width adjustment bolt 27, and the width can be easily adjusted. In addition, this can be realized with a simple mechanical structure, and costs can be reduced.

[0047] <Modifications> In the above embodiment, threaded holes are formed in the bolt hole portions 214 of the sleeve roll 21, but threaded holes may also be formed in the bolt hole portions TH of the spacer 23. In this case, the width adjustment bolts 27 can be screwed into the bolt hole portions TH. For example, in the case of state A in FIG. 4 , when the width adjustment bolts 27 are pressed in while contacting the intermediate sleeve 22, the spacer 23 and the sleeve roll 21 move outward in the axial direction, creating a gap between the spacer 23 and the intermediate sleeve 22. A shim 24 is inserted into the gap.

[0048] This modification is effective because it is easier to form threaded holes in the spacer 23 than in the sleeve roll 21. However, in order to form threaded holes in the bolt hole portions TH of the spacer 23, it is desirable to position the bolt hole portions TH at positions offset from the parting line L.

[0049] <Target of application> The horizontal roll according to this embodiment is not limited to H-section steel, and can be applied to any steel that is the target of universal rolling, such as channel steel, I-section steel, steel sheet piles, rails, etc. Furthermore, it is not limited to finish universal rolling, and can also be applied to intermediate universal rolling, for example, where the horizontal roll has a draft angle on its side surface.

[0050] REFERENCE SIGNS LIST 1 H-beam 2 Horizontal roll 3 Vertical roll 11 Web 11A Width direction left and right portions 11B Width direction center portion 12 Flange 20 Roll shaft 21 Sleeve roll 22 Intermediate sleeve 23 Spacer 24 Shim 25 Nut 26 Fixing bolt 27 Width adjustment bolt 28 Spacer 201 Key groove 211 Fitting hole 212 Accommodation portion 213A, 213B Through hole portion 214 Bolt hole portion 221 Through hole portion C1, C2 Axial center CR, CR2 Same circle HA Fitting hole L Partition line RE Recess SP Space TH Bolt hole portion W1 Web inner width W2 Web height Wr Roll width (roll width interval)

Claims

1. A horizontal roll used in universal rolling of structural steel, comprising: a roll shaft extending in the axial direction; an intermediate sleeve arranged radially outward of the roll shaft and having an outer diameter larger than the diameter of the roll shaft; and a pair of sleeve rolls arranged on the left and right of the intermediate sleeve in a state fitted onto the roll shaft, wherein the sleeve roll has a first hole extending in the axial direction, the intermediate sleeve has a second hole extending in the axial direction, the sleeve roll and the intermediate sleeve are fastened together by fixing bolts housed in the first hole and the second hole, the sleeve roll has a first bolt hole penetrating in the axial direction in addition to the first hole, and the side of the intermediate sleeve is positioned at the axial bottom surface of the first bolt hole.

2. The horizontal roll according to claim 1, further comprising a width adjustment bolt housed in the first bolt hole portion and having a tip portion capable of contacting a side surface of the intermediate sleeve.

3. The horizontal roll according to claim 2, wherein the first bolt hole portion is provided with a threaded hole that can be threadedly coupled with the width adjustment bolt.

4. A horizontal roll as described in claim 2, further comprising a spacer disposed axially between the intermediate sleeve and the sleeve roll, the spacer being provided with a second bolt hole portion capable of accommodating the width adjustment bolt, and the second bolt hole portion being provided with a threaded hole capable of being threadedly coupled to the width adjustment bolt.

5. A horizontal roll as claimed in any one of claims 1 to 4, which has a spacer and / or width adjusting shim arranged axially between the intermediate sleeve and the sleeve roll, and the spacer and / or width adjusting shim are fastened together with the sleeve roll and intermediate sleeve by the fixing bolt.

6. The horizontal roll according to claim 5, wherein the spacers and / or width adjusting shims are separable.

7. A width adjustment method for adjusting the roll width of a horizontal roll as described in any one of claims 1 to 6, comprising: a first step of releasing the fastening of the fixing bolt; and a second step of, after the first step, moving the sleeve roll axially outward by pushing the width adjustment bolt axially inward while bringing the tip of the width adjustment bolt housed in the first bolt hole portion into contact with the side of the intermediate sleeve.

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