Rolling mill

Abstract

To provide a rolling mill effective for satisfying both displacement easiness of rolling mill rolls during rolling and positioning accuracy of rolling mill rolls.SOLUTION: A rolling mill 1 comprises: a rolling mill rolls 12; screws 110 which push the rolling mill rolls 12 in a direction of pressurizing a rolled stock W; nuts 120 meshed with the screws 110; drive parts 50 which move the screws 110 forward / backward toward the rolling mill rolls 12 by relatively rotating the screws 110 and the nuts 120; and pushers 60 which push the screws 110 toward the rolling mill rolls 12 so as to reduce reaction force applied from the screws 110 to the nuts 120 in a direction drawing apart from the rolling mill rolls 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a rolling apparatus. [Background technology]

[0002] Patent Document 1 discloses a reduction device that includes a drive device that displaces a reduction screw connected to a chock of a roll by rotating it relative to a nut, and a hydraulic cylinder that hydraulically displaces the reduction screw and the nut together with a piston. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-1230420 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a rolling device that is effective in achieving both ease of displacement of the rolls during rolling and high positioning accuracy of the rolls. [Means for solving the problem]

[0005] A rolling apparatus according to one aspect of the present disclosure includes a rolling roll, a screw that presses the rolling roll in a direction to pressurize the rolled material, a nut that engages with the screw, a drive unit that moves the screw forward and backward toward the rolling roll by rotating the screw and the nut relatively, and a pusher that presses the screw toward the rolling roll so as to reduce the reaction force acting from the screw on the nut in a direction away from the rolling roll.

[0006] By reducing the reaction force acting from the screw to the nut, the screw and the nut can be easily rotated relative to each other and the rolling roll can be easily displaced even when a rolling load is applied. The displacement of the rolling roll is performed by the relative rotation of the screw and the nut, not by applying pressure to the pusher, so the rolling roll can be positioned with high accuracy according to the relative rotation angle. Therefore, it is possible to achieve both ease of displacement of the rolling roll and high accuracy of positioning the rolling roll.

[0007] The screw may further include a load sensor that detects the rolling load acting on the screw from the roll, and a pusher control unit that controls the pusher so as to push the screw with a force smaller than the rolling load. The screw is kept in contact with the nut as it moves away from the roll. This can further improve the positioning accuracy of the roll.

[0008] The pusher control unit may control the pusher so that the reaction force acting on the nut from the screw is equal to or less than half of the rolling load, thereby improving the ease of displacement of the roll while maintaining the positioning accuracy of the roll.

[0009] The device may further include a displacement control unit that controls the drive unit so as to rotate the screw and the nut relatively while the pusher pushes the screw with a force smaller than the rolling load. Taking advantage of the ease of displacement of the rolling rolls, the position of the rolling rolls can be adjusted during rolling.

[0010] The drive unit may move the screw forward and backward by rotating the nut. Since no relative rotation occurs between the screw and the pusher, the ease of displacement of the screw can be further improved.

[0011] The drive unit may move the screw forward and backward by rotating the screw, which can simplify the structure of the drive unit.

[0012] A thrust bearing may be provided between the pusher and the screw to transmit a force from the pusher to the screw toward the roll while allowing the screw to rotate relative to the pusher, thereby simplifying the structure of the drive unit and making the screw easy to rotate.

[0013] The outer diameter of the contact portion between the pusher and the screw may be smaller than the inner diameter of the nut, thereby achieving both a simplified structure of the drive unit and ease of rotation of the screw.

[0014] The pusher may be a hydraulic cylinder that presses the rod against the screw by hydraulic pressure, making it easy to control the force with which the screw is pushed.

[0015] The rolling rolls may pressurize the rolled material in the horizontal direction, and the driving unit may adjust the width of the rolled material in the horizontal direction by moving the screw forward and backward. It is more advantageous to achieve both ease of displacement of the rolling rolls and high positioning accuracy of the rolling rolls. Effect of the Invention

[0016] According to the present disclosure, it is possible to provide a rolling device that is effective in achieving both ease of displacement of the rolls during rolling and high positioning accuracy of the rolls. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic diagram illustrating the configuration of a rolling device. [Diagram 2] FIG. 2 is a cross-sectional view illustrating a schematic configuration of a roll displacement device. [Diagram 3] FIG. 11 is a cross-sectional view showing a modified example of the roll displacement device. [Figure 4] FIG. 11 is a cross-sectional view showing another modified example of the roll displacement device. [Diagram 5] FIG. 11 is a cross-sectional view showing still another modified example of the roll displacement device. [Figure 6] FIG. 2 is a block diagram illustrating a hardware configuration of a control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and duplicated description will be omitted.

[0019] The rolling mill 1 shown in Fig. 1 is a device that pressurizes a rolled material in a rolling process. The direction in which the rolling mill 1 presses the rolled material is hereinafter referred to as the "pressing direction D1". As an example, the rolling mill 1 presses the rolled material along the horizontal pressing direction D1 and adjusts the width of the rolled material in the horizontal direction.

[0020] The rolling device 1 includes a pair of roll units 10A, 10B, a housing 20, a roll drive device 30, a pair of roll displacement devices 40A, 40B, and a control device 70. The pair of roll units 10A, 10B sandwich and pressurize the rolled material W in a pressing direction D1.

[0021] The roll unit 10A has a rolling roll 12, a pair of roll chocks 15, 16, and a base frame 11. The rolling roll 12 rotates about an axis and presses the rolled material W along a pressing direction D1 while feeding the rolled material W along a conveying direction D2 intersecting the pressing direction D1. The rolling roll 12 has an upper end 13 and a lower end 14.

[0022] Each of the roll chocks 15, 16 holds the bearings of the rolling roll 12 around a vertical axis. An example of the bearings is a rolling bearing. The roll chock 15 holds the upper end 13 by a bearing so that the roll 12 can rotate around the vertical axis. The roll chock 16 holds the lower end 14 by a bearing so that the roll 12 can rotate around the vertical axis. The base frame 11 extends vertically and holds the roll chocks 15, 16.

[0023] The roll unit 10B is configured similarly to the roll unit 10A, and includes a rolling roll 12, a pair of roll chocks 15, 16, and a base frame 11. The housing 20 holds the roll units 10A and 10B so that the rolling roll 12 of the roll unit 10A and the rolling roll 12 of the roll unit 10B face each other along the pressure direction D1. The housing 20 holds each of the roll units 10A and 10B so that they can be displaced along the pressure direction D1. Hereinafter, the side approaching the roll unit 10B is the front of the roll unit 10A, and the side moving away from the roll unit 10B is the rear of the roll unit 10A. Similarly, the side approaching the roll unit 10A is the front of the roll unit 10B, and the side moving away from the roll unit 10A is the rear of the roll unit 10B.

[0024] The roll driving device 30 rotates the rolling rolls 12 of each of the roll units 10A and 10B about a vertical axis. For example, the roll driving device 30 has a pair of transmission units 32A and 32B, a motor 31, and a transmission shaft 36. Each of the transmission units 32A and 32B has an output shaft 33 protruding downward and incorporates one or more gears for transmitting rotation to the output shaft 33.

[0025] The transmission unit 32A is disposed above the reduction roll 12 of the roll unit 10A and is fixed to the base frame 11 of the roll unit 10A. An end of an output shaft 33 of the transmission unit 32A is connected to the upper end 13 of the reduction roll 12 of the roll unit 10A.

[0026] The transmission unit 32B is disposed above the reduction roll 12 of the roll unit 10B and is fixed to the base frame 11 of the roll unit 10B. An end of an output shaft 33 of the transmission unit 32B is connected to the upper end 13 of the reduction roll 12 of the roll unit 10B.

[0027] The motor 31 rotates a driven object in response to the supply of electric power. The motor 31 is connected to a transmission shaft 36. The transmission shaft 36 is, for example, a spline shaft, and transmits the rotation of the motor 31 to a transmission unit 32A while allowing the roll unit 10A to move along the pressing direction D1, and rotates the rolling roll 12 of the roll unit 10A via one or more gears and an output shaft 33 of the transmission unit 32A.

[0028] In addition, the transmission shaft 36 transmits the rotation of the motor 31 to the transmission unit 32B while allowing the roll unit 10B to move along the pressure application direction D1, and rotates the rolling roll 12 of the roll unit 10B via one or more gears and the output shaft 33 of the transmission unit 32B.

[0029] The roll displacement devices 40A and 40B displace the roll units 10A and 10B, respectively, along the pressure direction D1. For example, the roll displacement device 40A is located behind the roll unit 10A and moves the roll unit 10A forward and backward toward the roll unit 10B. The roll displacement device 40B is located behind the roll unit 10B and moves the roll unit 10B forward and backward toward the roll unit 10A.

[0030] The roll displacement device 40A has a casing 41, one or more acting units 100, a drive unit 50, and a pusher 60. The casing 41 extends in the vertical direction and is held by the housing 20. Each of the one or more acting units 100 is provided in the casing 41 and moves the roll unit 10A forward and backward toward the roll unit 10B. In the illustrated example, the roll displacement device 40A has a pair of acting units 100 aligned vertically, and each of the pair of acting units 100 moves the roll unit 10A forward and backward toward the roll unit 10B.

[0031] For example, each of the pair of action parts 100 has a screw 110 and a nut 120. The screw 110 pushes the rolling roll 12 in the direction (forward) in which the rolled material W is pressed. For example, the screw 110 protrudes forward from the casing 41 and contacts the base frame 11 of the roll unit 10A. A male thread is formed on the outer circumferential surface of the screw 110, spiraling around an axis along the pressing direction D1. The nut 120 has a female thread on its inner periphery, and is attached to the outer periphery of the screw 110 so that the female thread meshes with the male thread of the screw 110.

[0032] The drive unit 50 rotates the screw 110 and the nut 120 relatively in each of the pair of action units 100, thereby moving the screw 110 forward and backward toward the rolling roll 12 of the roll unit 10A. For example, the drive unit 50 has a motor 51 and a transmission unit 52. The motor 51 rotates the driven object in response to the supply of power. The transmission unit 52 transmits the rotation by the motor 51 to each of the pair of action units 100, causing the screw 110 and the nut 120 to rotate relatively.

[0033] The pusher 60 pushes the screw 110 toward the reduction roll 12 of the roll unit 10A so as to reduce the reaction force acting from the screw 110 to the nut 120 in a direction away from the reduction roll 12 of the roll unit 10A. For example, the pusher 60 pushes the screw 110 without pushing the nut 120.

[0034] Similar to the roll displacement device 40A, the roll displacement device 40B has a casing 41, one or more action parts 100 (for example, a pair of action parts 100), a drive part 50, and a pusher 60. In the roll displacement device 40B, each of the one or more action parts 100 advances and retreats the roll unit 10B toward the roll unit 10A. The screw 110 pushes the rolling roll 12 of the roll unit 10B toward the direction in which the rolling material W is pressed (forward). The drive part 50 advances and retreats the screw 110 toward the rolling roll 12 of the roll unit 10B. The pusher 60 pushes the screw 110 toward the rolling roll 12 of the roll unit 10B so as to reduce the reaction force acting from the screw 110 on the nut 120 in the direction away from the rolling roll 12 of the roll unit 10B.

[0035] The control device 70 controls the pusher 60 in each of the roll displacement devices 40A, 40B to push the screw 110, and controls the drive unit 50 to rotate the screw 110 and the nut 120 relatively while the pusher 60 is pushing the screw 110. The drive unit 50 of each of the roll displacement devices 40A, 40B rotates the screw 110 and the nut 120 relatively to move the screw 110 forward and backward, thereby adjusting the width of the rolled material W in the horizontal direction.

[0036] In each of the roll displacement devices 40A and 40B, the pusher 60 pushes the screw 110, thereby reducing the reaction force acting from the screw 110 to the nut 120. Therefore, even when a rolling load is applied, the screw 110 and the nut 120 can be easily rotated relative to each other, and the rolling roll 12 can be easily displaced. The displacement of the rolling roll 12 is performed by the relative rotation of the screw 110 and the nut 120, not by pressure from the pusher 60, so that the rolling roll 12 can be positioned with high accuracy according to the relative rotation angle. Therefore, both the ease of displacement of the rolling roll 12 and the positioning accuracy of the rolling roll 12 can be achieved.

[0037] In addition, even when each of the roll displacement devices 40A, 40B has two or more (for example, a pair) acting parts 100, the pusher 60 does not necessarily have to be provided for each of the two or more acting parts 100. For example, in the illustrated example, in both of the roll displacement devices 40A, 40B, the pusher 60 is provided for the acting part 100 (the acting part 100 located at the lower side) located between the roll chocks 15 and the roll chocks 16 in the vertical direction, and the pusher 60 is not provided for the acting part 100 located at the upper side. In each of the roll displacement devices 40A, 40B, the pusher 60 may be provided for each of the two or more acting parts 100.

[0038] In the housing 20, both of the roll units 10A, 10B do not necessarily have to be movable along the pressure direction D1, and either the roll unit 10A or 10B may be fixed to the housing 20. When the roll unit 10A is fixed to the housing 20, the roll displacement device 40A can be omitted, and when the roll unit 10B is fixed to the housing 20, 40B can be omitted.

[0039] In order to rotate the screw 110 and the nut 120 relatively, the driving unit 50 may rotate the screw 110 or may rotate the nut 120. Referring to Fig. 2, a configuration of the roll displacement devices 40A, 40B in which the driving unit 50 rotates the nut 120 to advance and retreat the screw 110 is illustrated.

[0040] As shown in Fig. 2, the action part 100 has a screw 110, a nut 120, a nut holder 130, a tip cover 150, and a base end cover 160. The screw 110 protrudes forward and backward from the casing 41. The nut 120 is attached to the outer periphery of the screw 110 so that the female thread of the nut 120 meshes with the male thread of the screw 110 as described above. The nut holder 130 has a cylindrical shape along the pressure direction D1, and houses the nut 120 and the screw 110. The nut holder 130 protrudes forward and backward from the casing 41. The screw 110 further protrudes forward and backward from the nut holder 130.

[0041] The nut 120 is fixed to the inner periphery of the nut holder 130. The nut holder 130 is held in the casing 41 via a pair of radial bearings 141, 142 so as to be rotatable about an axis along the pressure direction D1. A gear 131 is formed on the outer periphery of a portion of the nut holder 130 located between the pair of radial bearings 141, 142. The gear 131 meshes with a gear 53 of a transmission unit 52 of the drive section 50. This makes it possible to transmit the rotation of the motor 51 to the nut 120.

[0042] The tip cover 150 has a cup shape that opens to the rear. The tip cover 150 houses the screw 110 and the nut holder 130 that protrude forward from the casing 41, and is fixed to the casing 41 by bolt fastening or the like. The screw 110 penetrates a bottom 151 of the tip cover 150 and protrudes further forward. This makes it possible for the screw 110 to push the base frame 11.

[0043] The base end cover 160 has a cup shape that opens forward. The base end cover 160 houses the screw 110 and the nut holder 130 that protrude rearward from the casing 41, and is fixed to the casing 41 by bolt fastening or the like. An inward flange 163 that resists the displacement of the nut 120 away from the rolling roll 12 is formed on a peripheral wall 162 of the base end cover 160. The inward flange 163 contacts the nut holder 130 from the rear via a thrust bearing 164, and holds the nut 120 in a fixed position in the pressure direction D1. The inward flange 163 receives the axial load acting on the nut 120, so that the radial bearings 141, 142 are protected from excessive axial load.

[0044] The pusher 60 has a main body 61 and a rod 62. The main body 61 is fixed to a fixed position relative to the nut 120 in the pressure application direction D1. For example, the main body 61 is fixed to a bottom part 161 of the base end cover 160 from the rear. The rod 62 penetrates the bottom part 161, protrudes forward from the main body 61, and contacts the rear end of the screw 110. The main body 61 pushes the rod 62 forward to push the screw 110 forward. For example, the pusher 60 may be a hydraulic cylinder that presses the rod 62 against the screw 110 by hydraulic pressure in the main body 61.

[0045] The roll displacement devices 40A, 40B may further include a load sensor 80. The load sensor 80 detects the rolling load acting on the reduction roll 12 from the screw 110. There is no limitation on the location of the load sensor 80 as long as it can detect the rolling load acting on the reduction roll 12 from the screw 110. For example, the load sensor 80 may be provided at the tip of the screw 110. The load sensor 80 may be provided on the base frame 11 so as to receive the rolling load from the screw 110. An example of the load sensor 80 is a load cell of a strain gauge type or the like.

[0046] When the roll displacement devices 40A, 40B have the load sensor 80, the control device 70 may have a pusher control unit 71 and a displacement control unit 72 as functional components (hereinafter referred to as "functional blocks"). The pusher control unit 71 controls the pusher 60 so as to push the screw 110 with a force smaller than the rolling load detected by the load sensor 80. The pusher control unit 71 may control the pusher 60 so as to reduce the reaction force acting from the screw 110 to the nut 120 to half or less of the rolling load. The displacement control unit 72 controls the drive unit 50 so as to rotate the screw 110 and the nut 120 relatively (for example, rotate the nut 120) in a state in which the pusher 60 pushes the screw 110 with a force smaller than the rolling load.

[0047] The pusher 60 may be provided at the rear end of the screw 110. For example, the pusher 60 shown in Fig. 3 has a pressure chamber 64 provided at the rear end of the screw 110 instead of the main body 61 described above. The rod 62 protrudes rearward from the pressure chamber 64 and is connected to the bottom part 161 of the cover 160. The rod 62 connected to the bottom part 161 of the cover 160 is in a fixed position with respect to the nut 120 in the pressure application direction D1. The pressure chamber 64 pushes the screw 110 forward by hydraulic oil supplied from outside the cover 160 via the rod 62.

[0048] 4, the configuration of the roll displacement devices 40A, 40B in which the driver 50 rotates the screw 110 to advance and retreat the screw 110 is further illustrated. In the roll displacement devices 40A, 40B illustrated in FIG. 4, the screw 110 has a screw portion 113 and a spline shaft portion 114. The screw portion 113 has a male thread on its outer circumferential surface. The spline shaft portion 114 extends forward from the screw portion 113 and has a spline along the pressure direction D1 on its outer circumferential surface. In FIG. 4, a spline bearing 170 is attached to the outer periphery of the spline shaft portion 114 instead of the nut holder 130. The spline bearing 170 transmits rotation to the spline shaft portion 114 while allowing the spline shaft portion 114 to advance and retreat along the pressure direction D1.

[0049] The spline bearing 170 is held in the casing 41 via a pair of radial bearings 143, 144 so as to be rotatable about an axis along the pressure direction D1. A gear 171 is formed on the outer periphery of a portion of the spline bearing 170 that is located between the pair of radial bearings 143, 144. The gear 171 meshes with the gear 53 of the transmission unit 52 of the drive section 50. This makes it possible to transmit the rotation of the motor 51 to the screw 110.

[0050] In Fig. 4, nut 120 is attached to the outer periphery of screw portion 113 so that the female thread meshes with the male thread of screw portion 113, and is fixed, for example, to the inner periphery of base end cover 160 so as not to rotate together with screw portion 113. The axial load acting on nut 120 is received by inward flange 163 of base end cover 160, similar to the configuration in Fig. 2, but since nut 120 does not rotate, thrust bearing 164 is omitted.

[0051] In a configuration in which the driving unit 50 rotates the screw 110, resistance to the rotation of the screw 110 occurs due to friction between the rod 62 of the pusher 60 and the screw 110. In order to reduce this resistance, the roll displacement devices 40A, 40B may have a thrust bearing 63 between the pusher 60 and the screw 110. The thrust bearing 63 transmits a force from the pusher 60 to the screw 110 toward the reduction roll 12 while allowing the screw 110 to rotate relative to the pusher 60 (rod 62).

[0052] If there is no thrust bearing 63 between the pusher 60 and the screw 110, in order to reduce the above-mentioned resistance, the outer diameter d11 of the contact portion between the pusher 60 (rod 62) and the screw 110 may be smaller than the inner diameter d12 of the nut 120 (see FIG. 5).

[0053] The above describes an example of a rolling device 1 that pressurizes the rolled material along the horizontal pressurizing direction D1 and adjusts the width of the rolled material in the horizontal direction, but the configuration of the roll displacement devices 40A, 40B having a pusher 60 can also be applied to a rolling device that pressurizes the rolled material W along the vertical pressurizing direction D1 and adjusts the thickness of the rolled material in the vertical direction.

[0054] FIG. 6 is a block diagram illustrating a hardware configuration of the control device 70. For example, the control device 70 has a circuit 73. The circuit 73 has a processor 74, a memory 75, a storage 76, an input / output port 77, and a drive circuit 78. The storage 76 is composed of one or more non-volatile memory devices such as a flash memory or a hard disk. The storage 76 stores a program for configuring the above-mentioned functional blocks in the control device 70. The memory 75 is composed of one or more volatile memory devices such as a random access memory. The memory 75 temporarily stores a program loaded from the storage 76. The processor 74 is composed of one or more arithmetic devices such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The processor 74 executes the program loaded in the memory 75 to configure each of the above-mentioned functional blocks in the control device 70. The calculation results by the processor 74 are temporarily stored in the memory 75. The input / output port 77 inputs and outputs information between the control device 70 and an external device in response to a request from the processor 74. For example, the input / output port 77 acquires the detection result by the load sensor 80 in response to a request from the processor 74. The drive circuit 78 operates the motor 51 and the pusher 60 of the drive unit 50 in response to a request from the processor 74.

[0055] 〔summary〕 The above-described embodiment includes the following configurations. (1) A rolling device 1 comprising: a rolling roll 12; a screw 110 that presses the rolling roll 12 in the direction of applying pressure to the rolled material W; a nut 120 that meshes with the screw 110; a drive unit 50 that moves the screw 110 back and forth toward the rolling roll 12 by rotating the screw 110 and the nut 120 relatively; and a pusher 60 that presses the screw 110 toward the rolling roll 12 so as to reduce the reaction force acting from the screw 110 on the nut 120 in the direction away from the rolling roll 12. By reducing the reaction force acting from the screw 110 to the nut 120, even when a rolling load is applied, the screw 110 and the nut 120 can be easily rotated relative to each other, and the rolling roll 12 can be easily displaced. The displacement of the rolling roll 12 is performed by the relative rotation of the screw 110 and the nut 120, not by applying pressure to the pusher 60, so that the rolling roll 12 can be positioned with high accuracy according to the relative rotation angle. Therefore, it is possible to achieve both ease of displacement of the rolling roll 12 and high accuracy in positioning the rolling roll 12.

[0056] (2) The rolling apparatus 1 described in (1) further includes a load sensor 80 that detects the rolling load acting on the screw 110 from the rolling rolls 12, and a pusher control unit 71 that controls the pusher 60 so as to push the screw 110 with a force smaller than the rolling load. The screw 110 is maintained in contact with the nut 120 as it moves away from the reduction roll 12. This makes it possible to further improve the positioning accuracy of the reduction roll 12.

[0057] (3) The rolling device 1 according to (2), wherein the pusher control unit 71 controls the pusher 60 so that the reaction force acting from the screw 110 to the nut 120 is equal to or less than half the rolling load. While maintaining the positioning accuracy of the rolling rolls 12, the ease of displacement of the rolling rolls 12 can be improved.

[0058] (4) The rolling apparatus 1 described in (2) or (3) further includes a displacement control unit 72 that controls the drive unit 50 to rotate the screw 110 and the nut 120 relative to one another while the pusher 60 is pushing the screw 110 with a force smaller than the rolling load. By taking advantage of the ease of displacement of the rolling rolls 12, the position of the rolling rolls 12 can be adjusted during rolling.

[0059] (5) The rolling device 1 according to any one of (1) to (4), wherein the drive unit 50 rotates the nut 120 to move the screw 110 forward and backward. Since no relative rotation occurs between the screw 110 and the pusher 60, the ease of displacement of the screw 110 can be further improved.

[0060] (6) The rolling device 1 according to any one of (1) to (4), wherein the drive unit 50 rotates the screw 110 to move the screw 110 forward and backward. The structure of the drive unit 50 can be simplified.

[0061] (7) The rolling device 1 described in (6) further includes a thrust bearing between the pusher 60 and the screw 110, which transmits force from the pusher 60 to the screw 110 toward the rolling roll 12 while allowing the screw 110 to rotate relative to the pusher 60. This allows both the structure of the drive unit 50 to be simplified and the screw 110 to be easily rotated.

[0062] (8) The rolling device 1 according to (6) or (7), wherein the outer diameter of the contact portion between the pusher 60 and the screw 110 is smaller than the inner diameter of the nut 120. This allows both the structure of the drive unit 50 to be simplified and the screw 110 to be easily rotated.

[0063] (9) The rolling device 1 according to any one of (1) to (8), wherein the pusher 60 is a hydraulic cylinder that presses the rod against the screw 110 by hydraulic pressure. The force with which the screw 110 is pushed can be easily controlled.

[0064] (10) A rolling device 1 described in any one of (1) to (9), wherein the rolling rolls 12 pressurize the rolled material W in the horizontal direction, and the drive unit 50 adjusts the width of the rolled material W in the horizontal direction by moving the screw 110 back and forth. It is more advantageous to achieve both ease of displacement of the rolling rolls 12 and high positioning accuracy of the rolling rolls 12 . [Explanation of symbols]

[0065] W...rolled material, 1...rolling device, 12...rolling roll, 110...screw, 120...nut, 50...drive unit, 60...pusher, 80...load sensor, 71...pusher control unit, 72...displacement control unit.

Claims

1. A rolling roll; A screw that pushes the rolling roll in a direction to pressurize the rolled material; A nut that engages with the screw; A drive unit that rotates the screw and the nut relatively to move the screw toward and away from the rolling roll; a pusher that pushes the screw toward the rolling roll so as to reduce a reaction force acting on the nut from the screw in a direction away from the rolling roll; A rolling device comprising:

2. a load sensor for detecting a rolling load acting on the screw from the rolling roll; a pusher control unit that controls the pusher so as to push the screw with a force smaller than the rolling load; Further comprising: The rolling apparatus according to claim 1.

3. The pusher control unit controls the pusher so that a reaction force acting from the screw to the nut is equal to or less than half of the rolling load.

3. The rolling mill according to claim 2.

4. The screw and the nut are rotated relatively while the pusher pushes the screw with a force smaller than the rolling load.

3. The rolling mill according to claim 2.

5. The drive unit moves the screw forward and backward by rotating the nut. The rolling device according to any one of claims 1 to 4.

6. The drive unit rotates the screw to move the screw forward and backward. The rolling device according to any one of claims 1 to 4.

7. The rolling mill further includes a thrust bearing between the pusher and the screw, the thrust bearing transmitting a force from the pusher to the screw toward the rolling roll while allowing the screw to rotate relative to the pusher.

7. The rolling mill according to claim 6.

8. An outer diameter of a contact portion between the pusher and the screw is smaller than an inner diameter of the nut.

7. The rolling mill according to claim 6.

9. The pusher is a hydraulic cylinder that presses a rod against the screw by hydraulic pressure. The rolling device according to any one of claims 1 to 4.

10. The rolling roll presses the rolled material along a horizontal direction, The drive unit adjusts the width of the rolled material in the horizontal direction by moving the screw forward and backward. The rolling device according to any one of claims 1 to 4.

Images