Horizontal rollers and methods for adjusting their width.

Abstract

This invention provides a horizontal roller with easily adjustable width and cost-effective operation. In the horizontal roller, a first axially extending hole is provided in the sleeve roller, and a second axially extending hole is provided in the intermediate sleeve. The sleeve roller and the intermediate sleeve are fastened together by fixing bolts received in the first and second holes. A first axially penetrating bolt hole is provided on the sleeve roller, separate from the first hole. The side surface of the intermediate sleeve is disposed on the bottom portion of the first bolt hole in the axial direction.

Description

[Technical Field]

[0001] This invention relates to a horizontal roller and a method for adjusting the width of the horizontal roller. [Previous Technology]

[0002] Previously, structural steel, represented by H-beams, was typically manufactured using a universal rolling mill. A universal rolling mill is a rolling mill that includes a pair of horizontal rolls extending horizontally from the top and bottom, and a pair of vertical rolls extending vertically from the sides relative to the axis of the horizontal rolls. The universal rolling mill manufactures structural steel by simultaneously pressing the web of the rolled material down from the top and bottom by the pair of horizontal rolls and pressing the flange of the rolled material down by the sides of the pair of vertical rolls and the pair of horizontal rolls.

[0003] For example, Patent Document 1 discloses a width-adjustable rolling roll whose width (width in the direction of axial extension) can be adjusted offline. More specifically, this width-adjustable rolling roll includes a roll shaft, an annular sleeve, and dividing spacers. A rib-shaped protrusion is provided in the center of the roll shaft, and splined portions are provided on both sides. The annular sleeve is fitted into the splined portions. Dividing spacers are disposed between the annular sleeve and the rib-shaped protrusion. Dividing spacers and annular sleeves are respectively provided on both sides with respect to the rib-shaped protrusion. The annular sleeve, dividing spacers, and rib-shaped protrusions are fastened by bolts and nuts.

[0004] Additionally, for example, Patent Document 2 discloses a variable-width horizontal roller device that automatically adjusts the roller width online. [Prior Art Documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 51-86728 [Patent Document 2] Japanese Patent Application Publication No. 2013-151011 [Summary of the Invention]

[0006] [Problem to be Solved by the Invention] In the rolling roll of Patent Document 1, the roll width can be adjusted by replacing the dividing spacer. However, when replacing the dividing spacer, it is necessary to loosen the bolts and nuts to move the annular sleeve outward to widen the gap between the annular sleeve and the rib protrusion, but this operation is not easy.

[0007] In addition, in the horizontal roller device disclosed in Patent Document 2, the mechanism is very complex, so there are issues such as the cost of manufacturing the roller and the maintenance cost during use.

[0008] In view of the above situation, the object of the present invention is to provide a horizontal roller that allows for easy width adjustment and reduces costs. [Means for Solving the Problem]

[0009] One embodiment of the present invention comprises a horizontal roll for universal rolling of structural steel, the horizontal roll having: a roll shaft extending axially; an intermediate sleeve disposed radially outside the roll shaft, the outer diameter of which is larger than the diameter of the roll shaft; and sleeve rolls disposed on the left and right sides of the intermediate sleeve in a state of fitting into the roll shaft, forming a pair of left and right sides; a first hole extending axially is provided on the sleeve rolls; a second hole extending axially is provided on the intermediate sleeve; the sleeve rolls and the intermediate sleeve are fastened by fixing bolts received in the first hole and the second hole; a first bolt hole extending axially is provided on the sleeve rolls separately from the first hole; and a side surface of the intermediate sleeve (first structure) is disposed on the bottom part of the first bolt hole in the axial direction.

[0010] In addition, as in the first structure, it can also be configured to have a width adjusting bolt, which is received in the first bolt hole and whose front end can contact the side of the intermediate sleeve (second structure).

[0011] In addition, as in the second structure, it can also be configured such that a threaded hole capable of threadedly engaging with the width adjustment bolt is provided in the first bolt hole portion (third structure).

[0012] In addition, as in the second structure, it may also be configured to have a spacer that is axially sandwiched between the intermediate sleeve and the sleeve roller, and the spacer is provided with a second bolt hole portion that can accommodate the width adjusting bolt, and the second bolt hole portion is provided with a threaded hole that can be threadedly engaged with the width adjusting bolt (fourth structure).

[0013] In addition, any of the first to fourth structures may also be configured to have a spacer and / or a width adjusting liner arranged axially between the intermediate sleeve and the sleeve roller, wherein the spacer and / or the width adjusting liner are fastened together with the sleeve roller and the intermediate sleeve by the fixing bolt (fifth structure).

[0014] Additionally, as in the fifth structure, the spacer and / or width adjustment pad can also be configured to be divisible (sixth structure).

[0015] Additionally, one embodiment of the present invention is a width adjustment method for adjusting the width of a horizontal roller, which is configured as any of the first to sixth structures. The width adjustment method includes: a first step of releasing the tightening of the fixing bolt; and a second step, after the first step, moving the sleeve roller axially outward (seventh structure) by contacting the front end of the width adjustment bolt housed in the first bolt hole with the side of the intermediate sleeve and pressing the width adjustment bolt axially inward. [Effects of the Invention]

[0016] The present invention allows for easy width adjustment and reduces costs.

Implementation Method

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Furthermore, the embodiments shown below illustrate apparatus and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not specify the material, shape, structure, arrangement, etc., of the constituent parts in the following embodiments. Additionally, the drawings are illustrative. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc., differ from actual conditions, and the drawings also include portions with different dimensional relationships and ratios.

[0019] <Overview of H-beam and its rolling manufacturing method> In this embodiment, a rolling manufacturing method for H-beam, as an example of structural steel, will be described. FIG1 is a diagram showing the cross-sectional shape of the H-beam. As shown in FIG1, the uniform cross-sectional shape of the H-beam 1, orthogonal to the long side direction, is H-shaped. The H-beam 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 connecting the two ends of the web 11 in the left-right direction and extending in the up-down direction.

[0020] H-beams are made from slabs, billets, or shaped billets as rolling materials, and their cross-sectional shape is formed through rough rolling, intermediate rolling, and finish rolling. In the intermediate rolling or finish rolling process, a rolling method known as universal rolling is used.

[0021] Figure 2 shows a schematic diagram of the precision universal rolling of a typical H-beam. In universal rolling, rolling is performed using a pair of horizontal rolls 2 arranged vertically and a pair of vertical rolls 3 arranged horizontally. The horizontal rolls 2 rotate about an axis C1 extending in the left-right direction. The vertical rolls 3 rotate about an axis C2 extending in the up-down direction. The thickness of the web 11 of the H-beam 1 is pressed down on the outer circumferential surface of the pair of horizontal rolls 2, and the thickness of the flange 12 of the H-beam 1 is pressed down on the outer circumferential surface of the pair of vertical rolls 3 and the side surface of the pair of horizontal rolls 2.

[0022] Due to this rolling method, the inner width W1 (Fig. 1) of the web of the universally rolled H-beam 1 is affected by the width Wr (Fig. 2) of the horizontal roll. Furthermore, the definitions of the web height W2 and the flange width F1 are also shown in Fig. 1.

[0023] Dimensional tolerances are specified for the web height W2 and the inner width W1 of the web of the H-beam 1. Therefore, when a large number of H-beams 1 are rolled, and the sides of the horizontal rolls 2 wear, it may be impossible to comply with these dimensional tolerances. Previously, when roll wear developed in this way, the worn portion was modified, and the horizontal rolls were widened (sized down) to manufacture H-beams with a smaller web height W2, thereby restoring the roll shape. Therefore, there are problems such as deterioration of the original roll unit and the need to hold a large number of horizontal rolls. To solve this problem, it is important to have a technology that can adjust the width of the horizontal rolls.

[0024] <Structure of the Horizontal Roller> Next, the structure of the horizontal roll 2 of the present disclosure embodiment will be described. FIG3 is a diagram showing an outline of universal rolling using the horizontal roll 2 of the present disclosure embodiment. Furthermore, FIG3 shows the case of fine universal rolling. The horizontal roll 2 of this embodiment has a pair of sleeve rolls 21 on the left and right sides. As shown in FIG3, the left and right portions 11A of the web 11 in the width direction are pressed down by the pair of sleeve rolls 21. Since a space SP is provided at the portion where the outer periphery ends of the pair of sleeve rolls 21 are sandwiched in the left and right directions, the central portion 11B of the web 11 in the width direction is not directly pressed down by the horizontal roll 2.

[0025] In this embodiment, when wear develops on the sides of the left and right sleeve rollers 21, the left and right distance SS of the left and right sleeve rollers 21 can be adjusted to the desired value by matching the wear.

[0026] Figure 4 is a diagram showing a more specific structure of the horizontal roller 2 of this embodiment. The horizontal roller 2 shown in Figure 4 rotates about the axis C1. Hereinafter, the direction in which the axis C1 extends is referred to as the axial direction. Furthermore, the axial direction is the same as the left-right direction. In addition, the direction about the axis C1 is referred to as the circumferential direction, and the direction perpendicular to the axis C1 is referred to as the radial direction.

[0027] The horizontal roller 2 has a roller shaft 20, a pair of sleeve rollers 21 in the left-right direction, and an intermediate sleeve 22. Furthermore, in Figure 4, for convenience, the structures in state A when the sleeve rollers 21 are purchased and state B when the sleeve rollers 21 are worn are shown in one figure. In state A, the horizontal roller 2 has a spacer 23, and in state B, in addition to the spacer 23, it also has a pad 24.

[0028] The roller 20, also known as a mandrel, extends axially. The intermediate sleeve 22 is annular when viewed axially and is fitted into the axial center of the roller 20. The intermediate sleeve 22 is fixed relative to the roller 20 by thermoforming. Furthermore, it is not limited to this; for example, the intermediate sleeve 22 and the roller 20 may be integrally formed.

[0029] A pair of sleeve rollers 21 are annular when viewed axially, and are positioned to the left and right of the intermediate sleeve 22 when fitted into the roller shaft 20. The outer diameter D2 of the sleeve roller 21 is larger than the diameter D1 of the roller shaft 20 and the outer diameter D3 of the intermediate sleeve 22. Here, FIG5 is a side view of the sleeve roller 21 viewed axially. The sleeve roller 21 has a fitting hole 211 centered on the axis C1. The roller shaft 20 is fitted into the fitting hole 211. In the fitting hole 211, a plurality of receiving portions 212 are formed at equal intervals along the circumferential direction. The receiving portions 212 are recessed radially outward. Corresponding to each receiving portion 212, a plurality of keyways 201 (FIG. 4) are provided at equal intervals along the circumferential direction on the outer circumferential surface of the roller shaft 20 at equal intervals. Thereby, a key (not shown) is arranged between the keyway 201 and the receiving portion 212. The sleeve roller 21 can move axially via a key mounted on the roller shaft 20. In addition, the rotational torque of the roller shaft 20 is transmitted to the sleeve roller 21 via the key.

[0030] As shown in Figures 4 and 5, through holes 213A and 213B are provided in the sleeve roller 21. Through holes 213A and 213B are formed extending axially. Through hole 213A can accommodate a nut 25 and a spacer 28. Through hole 213B can accommodate the head side of a fixing bolt 26. Through hole 221 is provided in the intermediate sleeve 22. Through hole 221 is formed extending axially. Fixing bolt 26 can be accommodated in through hole 221. Fixing bolt 26 is inserted from the through hole 213B side.

[0031] Alternatively, it can also be in the following form: threaded holes are provided on the left and right sides of the intermediate sleeve 22, and two fixing bolts are inserted into the through holes of the left and right sleeve rollers 21 respectively. The front end of the fixing bolts is threaded and tightened to the intermediate sleeve 22, and the sleeve rollers 21 are fixed by the head of the fixing bolts.

[0032] The spacer 23 and the liner 24 are width adjustment components and are plate-shaped components with thickness in the axial direction. The spacer 23 and the liner 24 are annular when viewed in the axial direction and are fitted into the roller 20. The outer diameter D3 of the spacer 23 and the liner 24 is larger than the diameter D1 of the roller 20 and smaller than the outer diameter D2 of the sleeve roller 21.

[0033] The fixing bolt 26 passes axially through the intermediate sleeve 22 and the spacer 23 and is fastened to the nut 25. Furthermore, a spacer 28 is disposed between the bottom of the through hole 213A and the nut 25. This fastens the sleeve roller 21, the intermediate sleeve 22, and the spacer 23. Alternatively, if a gasket 24 is also used, the fixing bolt 26 passes axially through the intermediate sleeve 22, the spacer 23, and the gasket 24 and is fastened to the nut 25. This fastens the sleeve roller 21, the intermediate sleeve 22, the spacer 23, and the gasket 24.

[0034] Furthermore, 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 roller 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 respectively arranged on diagonal lines. In this way, two fixing bolts 26 are inserted from the through hole 213B side of one of the sleeve rollers 21, and the other two fixing bolts 26 are inserted from the through hole 213B side of the other sleeve roller 21. That is, a total of four fixing bolts 26 are used, i.e., multiple bolts.

[0035] <Width Adjustment Bolt> As shown in Figures 4 and 5, a bolt hole 214 is provided axially, separate from the through holes 213A and 213B, on the sleeve roller 21. The bolt holes TH of the spacer 23 and the gasket 24 are axially connected to the bolt hole 214. When the bolt hole 214 is viewed axially, the side of the intermediate sleeve 22 is located at the bottom. That is, the hole that passes through the bolt hole 214 and the bolt hole TH does not pass through the intermediate sleeve 22.

[0036] A threaded hole is formed in the bolt hole portion 214. Herein, the width adjusting bolt 27 inserted into the bolt hole portion 214 can be threaded and fastened to the threaded hole of the bolt hole portion 214. When the width adjusting bolt 27 threaded and fastened to the bolt hole portion 214 is pressed inward in the axial direction, the front end of the width adjusting bolt 27 can be brought into contact with the intermediate sleeve 22.

[0037] When the fixing bolt 26 and nut 25 are loosened (untightened state), and the width adjusting bolt 27 is pressed into the intermediate sleeve 22 while in contact with it, the sleeve roller 21 moves axially outward. This creates a gap between the sleeve roller 21 and the spacer 23 or the liner 24. Therefore, when replacing the spacer 23 or inserting the liner 24 to adjust the roller width, creating this gap becomes easier.

[0038] Furthermore, when the fixing bolt 26 and nut 25 are tightened, pressing the width adjusting bolt 27 into and pressing it against the intermediate sleeve 22 can also prevent the fixing bolt 26 from loosening when using the horizontal roller 2. Moreover, when using the horizontal roller 2 for rolling, it is not necessary to insert the width adjusting bolt 27 into the bolt hole 214.

[0039] In the example shown in Figure 5, four bolt holes 214 are provided and are equally spaced along the circumference. Width adjustment bolts 27 are inserted into each bolt hole 214. Furthermore, the four bolt holes 214, two through holes 213A, and two through holes 213B are arranged equally spaced along the circumference on the same circle CR. That is, adjacent holes in the circumference are spaced at 45-degree intervals.

[0040] Figure 6 shows a side view of the spacer 23 or gasket 24 viewed axially. The spacer 23 or gasket 24 has a fitting hole HA centered on the axis C1. The roller 20 is fitted into the fitting hole HA. The spacer 23 or gasket 24 can be divided into two parts along the dividing line L. In the fitting hole HA, recesses RE that are recessed outward in a direction perpendicular to the dividing line L are symmetrically arranged with respect to the dividing line L. Four recesses RE are arranged on the same circle CR2 centered on the axis C1. The fixing bolt 26 can pass through the recesses RE. Furthermore, the spacer 23 or gasket 24 can also be configured to be divided into more than three parts.

[0041] Furthermore, bolt hole portions TH are provided on the spacer 23 or the gasket 24, corresponding to the bolt hole portions 214. Four bolt hole portions TH are arranged on the same circle CR2. As described above, the width adjusting bolt 27 can pass through the bolt hole portion TH.

[0042] <Width Adjustment Method> Here, the width adjustment method of the horizontal roller 2 using the structure described above will be explained in more detail. First, when purchasing the sleeve roller 21, spacers 23 corresponding to the desired size of the H-beam are arranged on both axial sides of the intermediate sleeve 22, and a pair of spacers 23 are clamped between the pair of sleeve rollers 21 and the intermediate sleeve 22. Furthermore, the fixing bolts 26 are inserted into the through holes 213A and 213B and tightened with the nuts 25, thereby creating a horizontal roller 2 with the desired roller width (state A in FIG4). At this time, by pressing the width adjusting bolts 27 axially into and pressing them against the intermediate sleeve 22, loosening of the fixing bolts 26 can be suppressed.

[0043] Then, as rolling proceeds and wear develops on the side of the sleeve roll 21, the fixing bolt 26 is loosened offline, allowing the width adjusting bolt 27 to contact and be pressed into the intermediate sleeve 22, thereby creating a gap between the sleeve roll 21 and the spacer 23. Then, with the width adjusting bolt 27 removed from the horizontal roll 2, or with the width adjusting bolt 27 pulled out to a position that does not interfere with the gap, a shim 24 is inserted into the gap. The shim 24 is divided into two parts by the dividing line L as shown in FIG. 6, so the shim 24 can be inserted even without pulling the fixing bolt 26 out of the horizontal roll 2. Then, the horizontal roll 2 (state B of FIG. 4) is adjusted to the desired roll width by tightening the fixing bolt 26 to the nut 25.

[0044] When using H-beams with different inner widths W1 for the web, the spacer 23 is replaced. Width adjustment corresponding to the wear of the sleeve roller 21 is performed by inserting a shim 24. The width adjustment unit of the shim 24 is smaller than that of the spacer 23, thus allowing for fine-tuning of the width. 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 reducing the size of the H-beam, the width can be reduced in 50 mm increments using the spacer 23.

[0045] In addition, in the case of wear on the sleeve roller 21, a liner 24 is inserted to make the width slightly larger than the desired roller width, and the sleeve roller 21 is modified and finished using a roller lathe, thereby enabling the roller surface to be finished with good accuracy.

[0046] Thus, according to this embodiment, the horizontal roller 21 can be easily moved axially by using the width adjusting bolt 27, thereby making width adjustment easy. In addition, this can be achieved with a simple mechanical structure, and costs can be suppressed.

[0047] <Modified Example> In the described embodiment, a threaded hole is formed in the bolt hole portion 214 of the sleeve roller 21, but a threaded hole may also be provided in the bolt hole portion TH of the spacer 23. In this case, the width adjusting bolt 27 can be threaded into the bolt hole portion TH. For example, in the case of state A in FIG4, when the width adjusting bolt 27 is brought into contact with the intermediate sleeve 22 and pressed in, the spacer 23 and the sleeve roller 21 move axially outward, thereby creating a gap between the spacer 23 and the intermediate sleeve 22. A shim 24 is inserted into this gap.

[0048] This modified example becomes effective because the spacer 23 is easier to provide threaded holes for compared to the sleeve roller 21. However, in order to provide threaded holes in the bolt hole portion TH of the spacer 23, it is ideal that the bolt hole portion TH is positioned offset from the dividing line L.

[0049] <Application Scope> Regarding the horizontal roll of this embodiment, it is not limited to H-beams, as long as the steel section is to be universally rolled. For example, it can also be applied to channel steel, I-beams, sheet piles, or rails. In addition, it is not limited to fine universal rolling, for example, it can also be applied to intermediate universal rolling with draft angles on the side of the horizontal roll. [Simplified Explanation of the Diagram]

[0017] Figure 1 is a diagram showing the cross-sectional shape of an H-beam. Figure 2 is a schematic diagram of the general universal rolling of an H-beam. Figure 3 is a schematic diagram showing the universal rolling using the horizontal rolls of the embodiment disclosed herein. Figure 4 is a diagram showing a more specific structure of the horizontal rolls of this embodiment. Figure 5 is a side view of the sleeve roll viewed axially. Figure 6 is a side view of the spacer or liner viewed axially.

Claims

1. A horizontal roll for universal rolling of structural steel, the horizontal roll comprising: a roll shaft extending axially; an intermediate sleeve disposed radially outside the roll shaft, the outer diameter of which is larger than the diameter of the roll shaft; and sleeve rolls disposed on the left and right sides of the intermediate sleeve in a fitted state with the roll shaft, forming a pair of left and right sides; a first hole extending axially is provided on the sleeve rolls; a second hole extending axially is provided on the intermediate sleeve; the sleeve rolls and the intermediate sleeve are fastened by fixing bolts received in the first hole and the second hole; a first bolt hole extending axially is provided on the sleeve rolls separately from the first hole; when viewed axially from the first bolt hole, the side surface of the intermediate sleeve is disposed on the bottom surface of the first bolt hole; and the horizontal roll has a width adjusting bolt received in the first bolt hole, the front end of which can contact the side surface of the intermediate sleeve.

2. The horizontal roller as described in claim 1, wherein, A threaded hole is provided in the first bolt hole portion, which can be threadedly engaged with the width adjustment bolt.

3. The horizontal roller as claimed in claim 1, having a spacer disposed axially between the intermediate sleeve and the sleeve roller, wherein the spacer is provided with a second bolt hole portion capable of receiving the width adjusting bolt, and the second bolt hole portion is provided with a threaded hole capable of threadedly engaging with the width adjusting bolt.

4. A horizontal roll for universal rolling of structural steel, the horizontal roll comprising: a roll shaft extending axially; an intermediate sleeve disposed radially outside the roll shaft, the outer diameter of which is larger than the diameter of the roll shaft; and sleeve rolls disposed on the left and right sides of the intermediate sleeve in a fitted state with the roll shaft, forming a pair, wherein the sleeve rolls have a first hole extending axially, the intermediate sleeve has a second hole extending axially, the sleeve rolls and the intermediate sleeve are fastened by fixing bolts received in the first hole and the second hole, wherein the sleeve rolls have a first bolt hole extending axially separately from the first hole, and when viewed axially from the first bolt hole, the side of the intermediate sleeve is disposed on the bottom surface of the first bolt hole, the horizontal roll having a spacer and / or a width adjusting shim disposed axially between the intermediate sleeve and the sleeve rolls, the spacer and / or the width adjusting shim being fastened together with the sleeve rolls and the intermediate sleeve by the fixing bolts.

5. The horizontal roller as described in claim 4, wherein, The spacer and / or width adjustment pad can be divided.

6. A width adjustment method for adjusting the width of a horizontal roll used for universal rolling of structural steel, the horizontal roll comprising: a roll shaft extending axially; an intermediate sleeve disposed radially outside the roll shaft, having an outer diameter larger than the diameter of the roll shaft; and sleeve rolls disposed on the left and right sides of the intermediate sleeve in a fitted state with the roll shaft, forming a pair; a first hole extending axially provided on the sleeve roll; a second hole extending axially provided on the intermediate sleeve; the sleeve roll and the intermediate sleeve being fastened by fixing bolts received in the first hole and the second hole; a first bolt hole extending axially provided on the sleeve roll, separate from the first hole; and, when viewed axially from the first bolt hole, a side surface of the intermediate sleeve being disposed on the bottom surface of the first bolt hole; the width adjustment method comprising: The first step is to release the tightening of the fixing bolt; and the second step is, after the first step, to move the sleeve roller axially outward by contacting the front end of the width adjusting bolt housed in the first bolt hole with the side of the intermediate sleeve and pressing the width adjusting bolt axially inward.

Images