Horizontal roll and method of adjusting width of horizontal roll

Abstract

To provide a horizontal roll capable of easily adjusting the width and suppressing the cost.SOLUTION: In a horizontal roll, a sleeve roll is provided with a first hole part extending in an 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 by a fixing bolt accommodated in the first hole part and the second hole part, the sleeve roll is provided with a first bolt hole part penetrating in the axial direction separately from the first hole part, and a side surface of the intermediate sleeve is disposed on a bottom surface part when the first bolt hole part is viewed in the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[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 horizontal rolls simultaneously roll down the web of the rolled material from above and below, while the flanges of the rolled material are simultaneously rolled down by the sides of the pair of vertical rolls and the pair of horizontal rolls, thereby rolling out sectional steel.

[0003] For example, Patent Document 1 discloses a width-adjustable rolling roll that can adjust the roll width (width in the direction of extension of the axis) 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, split spacer, and 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. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 51-86728 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-151011 Summary of the Invention [Problem to be solved by the invention]

[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, but this work is not easy.

[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. [Means for solving the problem]

[0009] One aspect of the present invention is a horizontal roll used for universal rolling of shaped steel, a roll shaft extending in the axial direction; an intermediate sleeve disposed radially outward of the roll shaft and having an outer diameter larger than the diameter of the roll shaft; a pair of sleeve rolls disposed on the left and right sides of the intermediate sleeve in a state fitted onto the roll shaft; and The sleeve roll is provided with a first hole portion extending in an axial direction, The intermediate sleeve is provided with a second hole extending in the axial direction, the sleeve roll and the intermediate sleeve are fastened together by fixing bolts received in the first hole portion and the second hole portion, The sleeve roll is provided with a first bolt hole portion penetrating in an axial direction in addition to the first hole portion, When the first bolt hole portion is viewed in the axial direction, a side surface of the intermediate sleeve is disposed at the bottom surface thereof (first configuration).

[0010] Furthermore, in the first configuration, a width adjustment bolt may be housed in the first bolt hole portion and have 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] In the second configuration, a spacer is provided between the intermediate sleeve and the sleeve roll in the axial direction, The spacer is provided with a second bolt hole portion capable of accommodating the width adjustment bolt, The second bolt hole portion may be provided with a threaded hole that can be threadably coupled with the width adjustment bolt (fourth configuration).

[0013] In addition, in any one of the first to fourth configurations, a spacer and / or a width adjusting shim is provided which is sandwiched between the intermediate sleeve and the sleeve roll in the axial direction, The fixing bolt may be configured to fasten the sleeve roll, the intermediate sleeve, the spacer and / or the width adjusting shim together (fifth configuration).

[0014] In the fifth configuration, the spacer and / or the width adjusting shim may be configured to 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 one of the first to sixth configurations, a first step of releasing the fastening of the fixing bolt; After the first step, the tip of the width adjustment bolt accommodated in the first bolt hole portion is brought into contact with the side surface of the intermediate sleeve, and the width adjustment bolt is pushed axially inward to move the sleeve roll axially outward, including a second step (seventh configuration).

Advantages of the Invention

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

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a diagram showing the cross-sectional shape of an H-shaped steel. [Figure 2] FIG. 2 is a schematic diagram of the finishing universal rolling of a general H-shaped steel. [Figure 3] FIG. 3 is a diagram showing an overview of universal rolling using a horizontal roll according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a diagram showing a more specific configuration of the horizontal roll according to the present embodiment. [Figure 5] FIG. 5 is a side view of the sleeve roll viewed axially. [Figure 6] FIG. 6 is a side view of the spacer or shim viewed axially.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below illustrate devices and methods for embodying the technical idea of the present invention. The technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components as in the following embodiments. Also, the drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimensions, the ratio, etc. are different from the actual ones, and there are portions where the dimensional relationships and ratios are different between the drawings.

[0019] <Overview of H-shaped Steel and Its Rolling Manufacturing Method> In this embodiment, a rolling manufacturing method for H-shaped steel as an example of shaped steel will be described. FIG. 1 is a diagram showing the cross-sectional shape of an H-shaped steel. As shown in FIG. 1, an 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 by rolling slabs, blooms, beam blanks, etc. through the processes of rough rolling, intermediate rolling, and finish rolling. 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 beams. 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 beam 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 beam 1.

[0022] Because of 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 H-beam 1 have a set dimensional tolerance range. Therefore, as many H-beams 1 are rolled and the sides of horizontal roll 2 wear, it becomes possible that this dimensional tolerance range will no longer be met. Conventionally, when roll wear progresses in this way, the worn portion is removed and the roll is repurposed as a horizontal roll for manufacturing H-beams with a smaller web height W2, thereby restoring the roll shape. This has led to issues such as a worsening roll consumption rate and the need to possess a large number of horizontal rolls. To solve these issues, technology that allows the roll width of 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] FIG. 4 is a diagram showing a more specific configuration of the horizontal roll 2 according to this embodiment. The horizontal roll 2 shown in FIG. 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 is larger than the diameter D1 of the roll shaft 20 and the outer diameter D3 of the intermediate sleeve. 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 is formed with a plurality of accommodating portions 212 at equal intervals in the circumferential direction. The accommodating portions 212 are recessed radially outward. Corresponding to each of the accommodating portions 212, a plurality of key grooves 201 recessed radially inward are provided on the outer circumferential surface of the roll shaft 20 at equal intervals in the circumferential direction (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 a 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 threaded 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 two other 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, are used.

[0035] <Width adjustment bolt> 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 bolt 26 and the nut 25 are loosened (released), and the width adjustment bolt 27 is pressed in while in contact with the intermediate sleeve 22, the sleeve roll 21 moves outward in the axial direction, and a gap can be created between the sleeve roll 21 and the spacer 23 or the shim 24. Therefore, when replacing the spacer 23 or inserting the shim 24 to adjust the roll width, the work of creating the gap can be easily performed.

[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 45 degrees apart.

[0040] FIG. 6 shows a side view of the spacer 23 or shim 24 as viewed in the axial direction. The spacer 23 or 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 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 shim 24 may be divided into three or more pieces.

[0041] Furthermore, bolt holes TH are provided in spacer 23 or shim 24 in correspondence with 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 bolt hole portions 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, the pair of spacers 23 are sandwiched between the pair of sleeve rolls 21 and the intermediate sleeve 22, and fixing bolts 26 are inserted into the through-holes 213A and 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 roll 2, or pulled out to a position where they do not interfere with the gap, and a shim 24 is inserted into the gap. As shown in FIG. 6, the shim 24 is divided into two parts at a parting line L, so that 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 FIG. 4).

[0044] When using with H-beams with different web inner widths W1, the spacers 23 are replaced. Width adjustment according to wear on the sleeve roll 21 is performed by inserting shims 24. The shims 24 have a smaller width adjustment unit than the spacers 23, allowing for fine width adjustment. For example, the width adjustment unit for the spacers 23 is 50 mm, and the width adjustment unit for the shims 24 is 0.1 mm. In this case, when downsizing the H-beam, the spacers 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 roll width slightly larger than the desired width, and the sleeve roll 21 is re-machined and finished on a roll lathe, thereby enabling the roll surface to be finished with high precision.

[0046] As described above, with the horizontal roll 2 according to 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 achieved with a simple mechanical structure, which reduces costs.

[0047] <Modification> 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, since threaded holes are to be formed 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] <Applicable to> The horizontal roll according to this embodiment is not limited to H-beams, and can be applied to any steel section that is the target of universal rolling, such as channel steel, I-beam, steel sheet pile, or rail. 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. [Explanation of symbols]

[0050] 1 H-beam 2 horizontal rolls 3 Vertical Roll 11. Web 11A Width direction left and right 11B Width center part 12 flange 20 Roll axis 21 Sleeve Roll 22 Intermediate sleeve 23 Spacer 24 Sim 25 Nut 26 Fixing bolt 27 Width adjustment bolt 28 spacer 201 Keyway 211 Fitting hole 212 Storage unit 213A, 213B Through hole section 214 Bolt hole 221 Through hole C1,C2,C axis center CR,CR2 same circle HA fitting hole L dividing line RE recess SP space TH bolt hole W1 Inner web width W2 web height Wr Roll width (roll width interval)

Claims

1. A horizontal roll used for universal rolling of steel sections. a roll shaft extending in the axial direction; an intermediate sleeve disposed radially outward of the roll shaft and having an outer diameter larger than the diameter of the roll shaft; a pair of sleeve rolls disposed on the left and right sides of the intermediate sleeve in a state fitted onto the roll shaft; and The sleeve roll is provided with a first hole portion extending in an axial direction, The intermediate sleeve is provided with a second hole extending in the axial direction, the sleeve roll and the intermediate sleeve are fastened together by fixing bolts received in the first hole portion and the second hole portion, The sleeve roll is provided with a first bolt hole portion penetrating in an axial direction in addition to the first hole portion, A horizontal roll in which the side surface of the intermediate sleeve is positioned at the axial bottom surface of the first bolt hole portion.

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 threadably coupled with the width adjustment bolt.

4. a spacer disposed between the intermediate sleeve and the sleeve roll in the axial direction; The spacer is provided with a second bolt hole portion capable of accommodating the width adjustment bolt, The horizontal roll according to claim 2 , wherein the second bolt hole portion is provided with a threaded hole that can be threadably coupled with the width adjustment bolt.

5. a spacer and / or a width adjusting shim disposed between the intermediate sleeve and the sleeve roll in the axial direction; The horizontal roll according to claim 1 , wherein the fixing bolt fastens the sleeve roll, the intermediate sleeve, the spacer and / or the width adjusting shim.

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

7. A width adjusting method for adjusting the roll width of the horizontal roll according to claim 1, a first step of releasing the fastening of the fixing bolt; a second step of, after the first step, moving the sleeve roll outward in the axial direction by pressing the width adjustment bolt inward in the axial direction while bringing the tip end of the width adjustment bolt housed in the first bolt hole portion into contact with a side surface of the intermediate sleeve; Width adjustment methods, including:

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