Rolling mill

Abstract

This rolling mill is provided with a pair of upper and lower rollers disposed in a housing, and roller pedestals for holding the upper and lower rollers, respectively, wherein a gasket having a vibration reduction function is provided on a housing facing surface of the roller pedestals or / and a housing surface corresponding to the housing facing surface.

Description

Technical Field

[0001] The present invention relates to a rolling mill. Background Art

[0002] In a rolling mill such as a cold rolling line, when rolling a metal strip, if the rolling speed is too fast, the rolling mill will vibrate, resulting in poor thickness of the rolled material and patterns in the width direction of the plate called chatter marks, which may have a negative impact on the quality. As a general response to the vibration, the following method is adopted: a sensor for detecting vibration is installed in the rolling mill for monitoring, and the rolling is slowed down to a speed range where no vibration occurs. However, this method reduces production efficiency, and therefore many schemes have been proposed to reduce the vibration that causes the vibration of the rolling mill.

[0003] The rolling mill described in Patent Document 1 is provided with a contact end face abutting against an outlet side member of a housing supporting the support roller on a bearing body of the support roller. Patent Document 1 discloses a technique in which a wedge-shaped member is provided on the opposite side of the bearing body via a vibration reduction mechanism for reducing vibration in the vertical direction, thereby reducing vibration, the wedge-shaped member having an inclined sliding surface that moves away from the rolled material as it moves from the entry side to the exit side and a contact end face abutting against the outlet side member.

[0004] Patent Document 2 discloses a technique for reducing vibration by providing an elastic beam installed between two roll chocks of a backup roll of a rolling mill or between two press tables, an additional mass mounted on the beam, and a damper for braking the movement of the additional mass.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 8-10807

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 9-267110

[0007] However, the technologies disclosed in Patent Documents 1 and 2 require large-scale equipment modification to be introduced into an existing rolling mill, which is difficult from the perspective of time and cost. In addition, the technologies disclosed in Patent Documents 1 and 2 have the following problems: since the processing and modification of the housing and the roller bearing seat are accompanied, production losses are caused by stopping the production line. Summary of the invention

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rolling mill capable of reducing vibrations that cause chattering at low cost while suppressing production losses.

[0009] In order to solve the above problems and achieve the purpose,

[0010] (1) The rolling mill involved in the present invention comprises a pair of upper and lower rolls arranged in a shell and roll bearing seats respectively holding the upper and lower rolls, and is characterized in that a pad with a vibration reducing function is provided on at least one of the shell surfaces opposite to the shell of the roll bearing seats or the shell surfaces corresponding to the shell surfaces.

[0011] (2) The rolling mill according to the present invention is completed based on the invention of (1) above, and is characterized in that the pad is constructed using a vibration damping member.

[0012] (3) The rolling mill involved in the present invention is completed on the basis of the invention of (2) above, and is characterized in that the above-mentioned vibration damping part is a viscoelastic body, and the above-mentioned gasket is composed of a gasket main body made of metal material and the above-mentioned viscoelastic body covering the above-mentioned gasket main body.

[0013] (4) The rolling mill involved in the present invention is completed on the basis of any one of the inventions (1) to (3) above, and is characterized in that the upper and lower rolls are at least one of a pair of working rolls arranged above and below to clamp the rolled workpiece, a pair of intermediate rolls respectively in contact with the pair of working rolls, and a pair of support rolls respectively in contact with the pair of intermediate rolls.

[0014] The rolling mill according to the present invention has an effect of being able to reduce vibrations that cause chattering at low cost while suppressing production losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a rolling mill according to the embodiment.

[0016] Figure 2 (a) is a schematic diagram of the working roll bearing seat liner viewed from the surface side. Figure 2 (b) is a schematic diagram of the working roll bearing seat liner viewed from the back side.

[0017] Figure 3 The work roll bearing liner is shown in FIG. Figure 2 (a) A–A section view.

[0018] Figure 4 This is a diagram showing a state in which a work roll chock pad is fixed to a work roll chock by bolts.

[0019] Figure 5 It is a schematic diagram showing another example of the rolling mill according to the embodiment.

[0020] Figure 6 (a) is a graph showing the results of FFT analysis of vibration during rolling using the rolling mill according to the embodiment. Figure 6(b) is a graph showing the results of FFT analysis of vibration during rolling using a rolling mill according to a comparative example. DETAILED DESCRIPTION

[0021] Hereinafter, an embodiment of the rolling mill according to the present invention will be described. However, the present invention is not limited to this embodiment.

[0022] Figure 1 Schematic diagram of a rolling mill 1 according to the embodiment. Figure 1 As shown, the rolling mill 1 according to the embodiment includes a housing 2, a pair of working rolls 3a and 3b respectively arranged on the upper side and the lower side, a pair of intermediate rolls 5a and 5b, and backup rolls 7a and 7b. The pair of intermediate rolls 5a and 5b are in contact with the working rolls 3a and 3b respectively. The backup rolls 7a and 7b are in contact with the intermediate rolls 5a and 5b respectively. The rolling mill 1 according to the embodiment is a 6-stage rolling mill for rolling a steel plate S as a rolled material. The steel type of the steel plate S is, for example, a steel plate for automobile outer panels. In addition, the present invention is not limited to a 6-stage rolling mill, and can also be applied to a 4-stage rolling mill composed of 4 stages without intermediate rolls, and a multi-stage rolling mill with more than 6 stages.

[0023] like Figure 1 As shown, the housing 2 is provided with a work roll bearing seat 4a, a work roll bearing seat 4b, an intermediate roll bearing seat 6a, an intermediate roll bearing seat 6b, a backup roll bearing seat 8a, and a backup roll bearing seat 8b. The work roll bearing seat 4a supports one end of the axial direction of the upper work roll 3a so that it can rotate freely. The work roll bearing seat 4b supports one end of the axial direction of the lower work roll 3b so that it can rotate freely. The intermediate roll bearing seat 6a supports one end of the axial direction of the upper intermediate roll 5a so that it can rotate freely. The intermediate roll bearing seat 6b supports one end of the axial direction of the lower intermediate roll 5b so that it can rotate freely. The backup roll bearing seat 8a supports one end of the axial direction of the upper backup roll 7a so that it can rotate freely.

[0024] The support roller chock 8b rotatably supports one end of the lower support roller 7b in the axial direction.

[0025] In addition, work roll bearing seat pads 9a and 9b are provided on the shell facing surfaces of the work roll bearing seats 4a and 4b in the width direction orthogonal to the axial direction of the work rolls 3a and 3b. In the shell 2, shell blocks 10a and 10b are provided at the portions facing the work roll bearing seats 4a and 4b in the width direction. Shell pads 11a and 11b are provided on the surfaces of the shell blocks 10a and 10b facing the work roll bearing seats 4a and 4b in the width direction. In addition, the surfaces facing the work roll bearing seats 4a and 4b are shell surfaces corresponding to the shell facing surfaces of the work roll bearing seats 4a and 4b. And, the work roll bearing seat pads 9a and 9b and the shell pads 11a and 11b are arranged so that the facing surfaces are in contact with each other. In addition, lubricating oil such as grease is filled between the work roll bearing seat pad 9a and the shell pad 11a, and between the work roll bearing seat pad 9b and the shell pad 11b.

[0026] In addition, although Figure 1 Although not shown in the figure, work roll bearing seats, work roll bearing seat pads, housing blocks and housing pads are also arranged at the other ends of the work rolls 3a and 3b in the axial direction. Figure 1 Although not shown in the figure, intermediate roller bearing seats are also arranged at the other ends of the intermediate rollers 5a and 5b in the axial direction. Figure 1 Although not shown in the figure, support roller bearing seats are also arranged at the other ends of the support rollers 7a and 7b in the axial direction.

[0027] In the following description, the work rolls 3a and 3b are also simply referred to as work rolls 3 unless they are particularly distinguished. In the following description, the work roll chocks 4a and 4b are also simply referred to as work roll chocks 4 unless they are particularly distinguished. In the following description, the intermediate rolls 5a and 5b are also simply referred to as intermediate rolls 5 unless they are particularly distinguished. In the following description, the intermediate roll chocks 6a and 6b are also simply referred to as intermediate roll chocks 6 unless they are particularly distinguished. In the following description, the backup rolls 7a and 7b are also simply referred to as backup rolls 7 unless they are particularly distinguished. In the following description, the backup roll chocks 8a and 8b are also simply referred to as backup roll chocks 8 unless they are particularly distinguished. In the following description, the work roll chock pads 9a and 9b are also simply referred to as work roll chock pads 9 unless they are particularly distinguished. In the following description, the case blocks 10a and 10b are simply referred to as case blocks 10 unless otherwise specifically distinguished. In the following description, the case gaskets 11a and 11b are simply referred to as case gaskets 11 unless otherwise specifically distinguished.

[0028] Figure 2 (a) is a schematic diagram of the work roll bearing seat pad 9 viewed from the front side. Figure 2 (b) is a schematic diagram of the work roll bearing seat pad 9 viewed from the back side. Figure 3 The work roll bearing seat liner 9 is shown Figure 2 (a) is a diagram of the A-A section. In addition, in the present embodiment, the front side of the work roll bearing seat pad 9 refers to the side that contacts the shell pad 11 in the thickness direction of the work roll bearing seat pad 9 when the work roll bearing seat pad 9 is installed in the rolling mill 1. In addition, the back side of the work roll bearing seat pad 9 refers to the side that contacts the work roll bearing seat 4 in the thickness direction of the work roll bearing seat pad 9 when the work roll bearing seat pad 9 is installed in the rolling mill 1.

[0029] The work roll bearing seat pad 9 according to the embodiment is composed of a pad body 91 made of a metal material such as brass and a viscoelastic body 92 which is a vibration reduction member of a vibration reduction mechanism having a vibration reduction function. The material of the pad body 91 is not limited to a metal material, and any material may be used as long as it has a strength that can withstand fixing by bolts, for example, a resin material or a ceramic material having a greater rigidity than the viscoelastic body 92.

[0030] The pad body 91 is a plate-like member elongated in the axial direction of the work roll 3 , and its back edge is cut off over the entire circumference to be lowered by one step, and is convex toward the work roll chock 4 in the thickness direction.

[0031] The viscoelastic body 92 is a plate-shaped member larger than the pad body 91, and has an internal space along the outer contour (convex shape) of the pad body 91 in a manner that the pad body 91 can be enclosed. At the same time, a portion of the back side of the viscoelastic body 92 is opened to expose the back side of the pad body 91 except for the edge. In addition, in order to make the edge of the back side of the viscoelastic body 92 hooked to the edge of the back side of the pad body 91 that is lowered by one level, the viscoelastic body 92 is adhered and fixed to the pad body 91 by an adhesive in a state where the viscoelastic body 92 covers the pad body 91. In this way, the edge of the back side of the viscoelastic body 92 is hooked to the edge of the back side of the pad body 91 that is lowered by one level, and the viscoelastic body 92 is enclosed in the pad body 91. As a result, compared with the case where the plate-shaped viscoelastic body 92 is adhered and fixed to the surface of the pad body 91 by adhesive alone, the fixing strength can be improved. In addition, as a method of fixing the viscoelastic body 92 to the pad main body 91, for example, the viscoelastic body 92 can be fastened and fixed to the pad main body 91 by a fastening member such as a bolt. In addition, as a method of fixing the viscoelastic body 92 to the pad main body 91, for example, the viscoelastic body 92 can be fastened and fixed to the pad main body 91 by an adhesive and a fastening member.

[0032] As the viscoelastic body 92, for example, a vibration-damping rubber having excellent heat resistance and water resistance may be used. In addition, in order to obtain the effect of reducing vibration, it is preferred that the viscoelastic body 92 has a loss coefficient of 0.2 or more in the frequency band (100 to 1000 Hz) to be reduced at the ambient temperature (40 [°C] to 80 [°C], preferably 50 [°C] to 60 [°C] in the case of cold rolling). In addition, Figure 3 As shown, at least in the thickness direction, the thickness t of the viscoelastic body 92 on the shell side may be set to the upper limit value, for example, by setting the maximum thickness of the viscoelastic body 92 that enables the work roll chock pad 9 to be mounted on the rolling mill 1. Furthermore, in order to obtain a more sufficient vibration damping effect, the thickness t of the viscoelastic body 92 is preferably 1 [mm] or more and 15 [mm] or less.

[0033] The pad body 91 is provided with a plurality of through holes 911 penetrating in the thickness direction. The viscoelastic body 92 is provided with a plurality of through holes 922 penetrating in the thickness direction in a manner that is larger in diameter than the through holes 911 of the pad body 91 and communicates with the through holes 911. Thus, the work roll bearing seat pad 9 is provided with a plurality of bolt holes 94 that communicate the through holes 911 of the pad body 91 with the through holes 922 of the viscoelastic body 92 and penetrate the work roll bearing seat pad 9 in the thickness direction. Furthermore, as Figure 4 As shown in FIG. 1 , the work roll chock pad 9 is fixed to the side surface of the work roll chock 4 on the side opposite to the shell pad 11 by a plurality of bolts 93 respectively inserted into a plurality of bolt holes 94. In addition, in the rolling mill 1 according to the embodiment, the work roll chock pad 9 is brought into contact with the shell pad 11. Thus, in the rolling mill 1 according to the embodiment, the vibration that causes the vibration generated in the rolling mill 1 can be reduced by utilizing the vibration-damping function of the viscoelastic body 92 of the work roll chock pad 9. In addition, in the rolling mill 1 according to the embodiment, the work roll chock pad 9 is formed of a pad body 91 and a viscoelastic body 92 formed of a metal material. Thus, compared with a case where the work roll chock pad 9 is formed of only a vibration-damping member such as a viscoelastic body, the rigidity of the work roll chock pad 9 can be improved, and the life of the work roll chock pad 9 that is exposed to vibration for a long time can be extended.

[0034] In addition, on the front side of the work roll bearing seat pad 9, a groove 923 in the shape of two circles arranged in a horizontal direction and intersecting is provided on the surface 921 of the viscoelastic body 92. The groove 923 is provided so that the grease filled between the work roll bearing seat pad 9 and the shell pad 11 can easily stay, but it is not particularly limited to this shape. Moreover, in the rolling mill 1 according to the embodiment, the vibration that causes the chattering can also be reduced by the vibration reduction function of the grease filled between the work roll bearing seat pad 9 and the shell pad 11. In addition, by providing the groove 923 in the viscoelastic body 92 as in the work roll bearing seat pad 9 according to the embodiment, the depth of the groove 923 can be made shallower than when the work roll bearing seat pad composed of only a metal material is provided with a groove for grease similar to the groove 923.

[0035] Figure 5 It is a diagram showing another configuration example of the rolling mill 1 according to the embodiment. Figure 5 The rolling mill 1 shown is provided with intermediate roll bearing seat pads 12a and 12b on the shell facing surfaces of the intermediate roll bearing seats 6a and 6b in the width direction orthogonal to the axial direction of the intermediate rolls 5a and 5b. In addition, in the shell 2, shell blocks 13a and 13b are provided at the portions facing the intermediate roll bearing seats 6a and 6b in the width direction of the intermediate rolls 5a and 5b. Shell pads 14a and 14b are provided on the surfaces of the shell blocks 13a and 13b facing the intermediate roll bearing seats 6a and 6b in the width direction (shell surfaces corresponding to the shell facing surfaces of the intermediate roll bearing seats 6a and 6b). The intermediate roll bearing seat pads 12a and 12b and the shell pads 14a and 14b are arranged so that the facing surfaces are in contact with each other. Lubricating oil such as grease is filled between the intermediate roll bearing seat pad 12a and the shell pad 14a, and between the intermediate roll bearing seat pad 12b and the shell pad 14b.

[0036] in addition, Figure 5 The rolling mill 1 shown is provided with support roller bearing seat pads 15a and 15b on the shell facing surfaces of the support roller bearing seats 8a and 8b in the width direction orthogonal to the axial direction of the support rollers 7a and 7b. In addition, in the shell 2, shell blocks 16a and 16b are provided at the portions facing the support roller bearing seats 8a and 8b in the width direction of the support rollers 7a and 7b. Shell pads 17a and 17b are provided on the surfaces of the shell blocks 16a and 16b facing the support roller bearing seats 8a and 8b in the width direction (shell surfaces corresponding to the shell facing surfaces of the support roller bearing seats 8a and 8b). The support roller bearing seat pads 15a and 15b and the shell pads 17a and 17b are arranged so that the facing surfaces are in contact with each other. In addition, lubricating oil such as grease is filled between the support roller bearing seat pad 15a and the shell pad 17a, and between the support roller bearing seat pad 15b and the shell pad 17b.

[0037] In the following description, the intermediate roll bearing seat pads 12a and 12b are also simply referred to as intermediate roll bearing seat pads 12 unless they are particularly distinguished from each other. In the following description, the backup roll bearing seat pads 15a and 15b are also simply referred to as backup roll bearing seat pads 15 unless they are particularly distinguished from each other. In the following description, the housing blocks 13a, 13b, 16a and 16b are also simply referred to as housing blocks 13 and 16 unless they are particularly distinguished from each other. In the following description, the housing pads 14a, 14b, 17a and 17b are also simply referred to as housing pads 14 and 17 unless they are particularly distinguished from each other.

[0038] In addition, although Figure 5 Although not shown, intermediate roller bearing seat pads, support roller bearing seat pads, housing blocks and housing pads are also arranged at the other ends of the intermediate rollers 5a and 5b in the axial direction and the other ends of the support rollers 7a and 7b in the axial direction. In addition, Figure 5 The other structures of the rolling mill 1 shown are Figure 1 The rolling mill 1 shown is identical.

[0039] exist Figure 5 In the rolling mill 1 shown, the Figure 2 to Figure 4 The bearing seat pad or shell pad provided with the vibration reduction mechanism (viscoelastic body) having the vibration reduction function as described above is applied to one or more of the work roll bearing seat pad 9, the intermediate roll bearing seat pad 12, the backup roll bearing seat pad 15 and the shell pads 11, 14, 17. Figure 5 In the rolling mill 1 shown, vibrations that cause chattering can be reduced.

[0040] On the other hand, the magnitude of the vibration that causes the chattering becomes the largest at the portion close to the drive roll in the rolling mill 1. Figure 5 In the rolling mill 1 shown in the figure, it is more desirable to apply the bearing seat pad provided with the above-mentioned vibration reduction mechanism (viscoelastic body) of the present invention to the work roll bearing seat pad 9 than to the backup roll bearing seat pad 15. Figure 5 In the rolling mill 1 shown, it is more desirable to apply the housing liner 11 provided with the vibration reducing mechanism (viscoelastic body) of the present invention, rather than the housing liner 17. It is also desirable to apply the bearing seat liner or housing liner provided with the vibration reducing mechanism (viscoelastic body) of the present invention to the liner at other locations by addition. The liner at other locations may be, for example, at least one of the intermediate roll bearing seat liner 12, the backup roll bearing seat liner 15, and the housing liner 14, 17.

[0041] Figure 6(a) is a graph showing the result of FFT analysis of vibration during rolling by the rolling mill 1 according to the embodiment. Figure 6 (b) is a graph showing the results of FFT analysis of vibrations during rolling using a rolling mill according to a comparative example. In addition, the rolling mill 1 according to the embodiment includes a work roll bearing seat pad 9 composed of a metal pad body 91 and a viscoelastic body 92. In addition, in the rolling mill 1 according to the embodiment, the thickness t of the viscoelastic body 92 is 3 [mm]. On the other hand, the rolling mill according to the comparative example includes a metal work roll bearing seat pad. In addition, the rolling mill 1 according to the embodiment and the rolling mill according to the comparative example have the same structure except that the work roll bearing seat pads they each include are different.

[0042] Comparing the rolling mill 1 involved in the embodiment with the rolling mill involved in the comparative example, the vibration intensity in the frequency band affecting the quality was reduced by about 80% in the rolling mill 1 involved in the embodiment compared with the rolling mill involved in the comparative example, and a good vibration reduction result was obtained.

[0043] As described above, in the rolling mill 1 according to the embodiment, the following effects can be obtained only by applying the present invention to each pad such as the work roll bearing seat pad 9, which is a component that is periodically replaced at the time of replacement of the work rolls 3 and the like that is suitable for the rolling conditions. That is, the rolling mill 1 according to the embodiment can reduce the vibration that causes the vibration generated during rolling by an inexpensive mechanism without large-scale modification of the rolling mill 1, and can suppress the occurrence of production losses without excessively stopping the production line. In addition, in the rolling mill 1 according to the embodiment, the thinner the steel plate S as the rolled material is, the faster the rolling speed is, the greater the influence of the vibration that causes the vibration is, and even at the same rolling speed, the harder the steel plate S is, the more easily it is affected by the vibration that causes the vibration. Therefore, in the rolling mill 1 according to the embodiment, when a thin steel plate or a hard steel plate is rolled as the steel plate S, the above-mentioned effects can be further achieved by applying the present invention.

[0044] Industrial Applicability

[0045] The present invention can provide a rolling mill capable of reducing vibrations that cause chattering at low cost while suppressing production losses.

[0046] Description of Reference Numerals

[0047] 1… rolling mill; 2… housing; 3, 3a, 3b… working roll; 4, 4a, 4b… working roll bearing seat; 5, 5a, 5b… intermediate roll; 6, 6a, 6b… intermediate roll bearing seat; 7, 7a, 7b… support roll; 8, 8a, 8b… support roll bearing seat; 9, 9a, 9b… working roll bearing seat liner; 10, 10a, 10b… housing block; 11, 11a, 11b… housing liner; 12, 12a, 12b…intermediate roller bearing seat pad; 13, 13a, 13b…housing block; 14, 14a, 14b…housing pad; 15, 15a, 15b…support roller bearing seat pad; 16, 16a, 16b…housing block; 17, 17a, 17b…housing pad; 91…pad body; 92…viscoelastic body; 93…bolt; 94…bolt hole; 911…through hole; 922…through hole; 923…groove.

Claims

1. A rolling mill comprising a pair of upper and lower rolls disposed in a housing and roll bearings for holding the upper and lower rolls, respectively, wherein: A pad having a vibration reducing function is provided on at least one of the shell facing surface of the roller bearing housing or the shell surface corresponding to the shell facing surface.

2. The rolling mill according to claim 1, characterized in that The pad is formed using a vibration damping member.

3. The rolling mill according to claim 2, characterized in that The vibration damping member is a viscoelastic body, The gasket includes a gasket body portion formed of a metal material and the viscoelastic body covering the gasket body portion.

4. The rolling mill according to any one of claims 1 to 3, characterized in that The upper and lower rolls are at least one of a pair of work rolls arranged up and down with a rolled material sandwiched therebetween, a pair of intermediate rolls respectively in contact with the pair of work rolls, and a pair of backup rolls respectively in contact with the pair of intermediate rolls.

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