Asymmetric rolling device

Abstract

The present invention relates to an asymmetric rolling apparatus capable of improving the physical properties of a material, and includes a first work roll that contacts a first surface of a material to be rolled, a second work roll that contacts a second surface of the material to be rolled and has a second radius larger than a first radius of the first work roll so as to enable asymmetric rolling of the material to be rolled, a drive roll that contacts the first work roll and is formed above or below the first work roll so as to be able to drive the first work roll, a drive device that drives the second work roll or the drive roll, and a first idler roll that contacts the first work roll and is formed in front of or behind the first work roll so as to be able to support the first work roll in the front-rear direction.

Description

Technical Field

[0001] The present invention relates to an asymmetric rolling apparatus, and more particularly to an asymmetric rolling apparatus capable of improving the physical properties of materials.

Background Art

[0002] In order to process a metal member into a form such as a plate having a certain standard, a rolling process can generally be performed. In such a rolling process, the microstructure inside the material to be rolled can also change according to the change in the thickness of the material to be rolled.

[0003] According to such a change in the microstructure of the material to be rolled, first, a texture in which crystals are oriented in the azimuth direction appears. The texture that appears by such rolling has a very close relationship with the physical properties of materials such as the formability of the material to be rolled.

[0004] Therefore, by controlling the texture of the material to be rolled in the rolling process, it is possible to improve the physical properties of materials such as the formability of the material to be rolled after rolling.

[0005] Conventionally, in order to improve such physical properties of materials, an asymmetric rolling technique using at least a pair of work rolls having different radii has been developed so that shear deformation can be performed well even on materials with poor room-temperature formability.

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the conventional asymmetric rolling technology as described above, during the rolling process, a strong reaction force acts on the work roll with a relatively small radius in the longitudinal direction, that is, the advancing direction of the material to be rolled. The work roll with a small radius is easily deformed, and various defective phenomena such as non-uniform wave phenomenon, buckle phenomenon, thickness non-uniformity phenomenon, distortion phenomenon, or deflection phenomenon biased to one side may occur in the material to be rolled during this process. There were many problems such as the work roll being severely deformed beyond the elastic range, detaching from the fixed position, or being damaged.

[0007] The present invention is for solving many problems including the above problems, and can firmly cope with the reaction force in the longitudinal direction by using each idler roll and each guide roll that can support the first work roll in the longitudinal direction. Even when deformation occurs in the first work roll, it is an object of the present invention to provide an asymmetric rolling device that enables alignment to the fixed position and restoration to the original state by actively coping with this. However, the above problems are exemplary and do not limit the scope of the present invention thereby.

Means for Solving the Problems

[0008] The asymmetric rolling device according to the idea of the present invention for solving the above problems includes a first work roll that contacts the first surface of the material to be rolled, a second work roll that contacts the second surface of the material to be rolled and has a second radius larger than the first radius of the first work roll so as to enable asymmetric rolling of the material to be rolled, a drive roll formed above or below the first work roll so as to contact the first work roll and be able to drive the first work roll, a drive device that drives the second work roll or the drive roll, and a first idler roll formed in front of or behind the first work roll so as to contact the first work roll and support the first work roll in the longitudinal direction without interfering with the linear movement path of the material to be rolled.

[0009] Further, according to the present invention, the first idle roll is formed at a first interval from the drive roll and can have a third radius smaller than the first radius of the first work roll so as not to interfere with the rolling path of the material to be rolled.

[0010] Further, according to the present invention, the first idle roll includes a first-1 idle roll formed in front of the first work roll, where the second height of the second central axis is the same as the first height of the first central axis of the first work roll, and a first-2 idle roll formed behind the first work roll, where the third height of the third central axis is the same as the first height of the first central axis of the first work roll.

[0011] Further, according to the present invention, the drive device can drive the drive roll and the second work roll so that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll.

[0012] Further, according to the present invention, the drive device is such that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll. The fourth radius of the drive roll is the same as the second radius of the second work roll, and the drive roll and the second work roll can be driven at the same rotational angular velocity.

[0013] Further, according to the present invention, it can further include a first guide roll formed in front of or behind the first idle roll so as to contact the first idle roll and support the first idle roll in the front-rear direction or the circumferential direction of the drive roll.

[0014] Further, according to the present invention, the first guide roll can have a fifth radius larger than the first radius of the first work roll or larger than the third radius of the first idle roll so as to contact the drive roll and not interfere with the rolling path of the material to be rolled.

[0015] Further, according to the present invention, the first guide roll may include a first-1 guide roll formed in front of the first work roll, with the fourth height of the fourth central axis being higher than the first height of the first central axis of the first work roll, and a first-2 guide roll formed behind the first work roll, with the fifth height of the fifth central axis being higher than the first height of the first central axis of the first work roll.

[0016] Further, according to the present invention, the first guide roll may be formed at a second interval from the drive roll.

[0017] Further, according to the present invention, it may further include a second idler roll formed in front of or behind the first guide roll so as to contact the first guide roll and support the first guide roll in the front-rear direction or the circumferential direction of the drive roll.

[0018] Further, according to the present invention, it may further include a second guide roll formed in front of or behind the second idler roll so as to contact the second idler roll and support the second idler roll in the front-rear direction or the circumferential direction of the drive roll.

[0019] Further, according to the present invention, the first work roll may include a rolling part that contacts the material to be rolled so as to roll the material to be rolled, a joint part formed on the rolling part so that the rolling part can perform articular movement in the front-rear direction, and a sliding part formed on the rolling part so that the rolling part can slide in the axial direction while rotating.

[0020] Further, according to the present invention, the joint part may be configured by selecting at least one of joint balls, angular contact bearings, and combinations thereof installed in a shaft hole part formed in a concave shape at an end of the rolling part.

[0021] Also, according to the present invention, the sliding portion may include a sleeve loosely inserted into the shaft hole portion of the rolling portion, a sleeve rotating shaft rotatably installed on the sleeve, a guide bush fixed to the cassette body or rotatably formed to rotatably and slidably support the sleeve rotating shaft, and a damping device installed on the sleeve rotating shaft to enable the original state restoration of the sliding position of the sleeve rotating shaft at no load while alleviating vibration and noise.

[0022] Also, according to the present invention, the damping device may include a compression spring installed on one side of the sleeve rotating shaft and having an elastic restoring force acting during contraction, and a tension spring installed on the other side of the sleeve rotating shaft and having an elastic restoring force acting during extension.

[0023] Also, according to the present invention, the sliding portion may further include at least one deep groove ball bearing formed between the sleeve and the sleeve rotating shaft, and a thrust bearing formed between the guide bush and the bush cap.

[0024] Also, according to the present invention, the first guide roll may include at least one or more rolling oil injection groove portions, a contact portion that contacts the first idle roll, a shaft portion having one end fixed to the cassette body and the other end inserted into a concave portion formed in a concave shape at the end of the contact portion, and at least one self-aligning bearing formed between the contact portion and the shaft portion so that the rotation centers of the contact portion are aligned and can rotate.

[0025] Further, according to the present invention, the rolling oil injection groove portion may include a circumferential groove portion formed in a ring-shaped linear groove along the circumference of the contact portion so that the injected rolling oil can pass through the rolling oil injection groove portion and be directly injected into the first work roll through a first interval between the first idle roll and the drive roll.

Effect of the Invention

[0026] According to many embodiments of the present invention configured as described above, it is possible to firmly cope with the reaction force in the front-rear direction by using each idle roll and each guide roll that can support the first work roll in the front-rear direction, minimize the deformation of the first work roll in the front-rear direction, and even when deformation occurs in the first work roll, it is possible to actively cope with it to achieve alignment to a fixed position and restoration to the original state. Through this, it is possible to increase the strength and durability of the components, prevent defective phenomena, and precisely control the shape of the produced sheet material. Of course, the scope of the present invention is not limited by such effects.

Brief Description of the Drawings

[0027]

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Figure 11

Embodiments for Carrying Out the Invention

[0028] Hereinafter, with reference to the accompanying drawings, many preferred embodiments of the present invention will be described in detail.

[0029] Each embodiment of the present invention is provided to more fully explain the present invention to those having ordinary knowledge in the art. The following embodiments can be modified into many other forms, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to further enrich and complete the present disclosure and to fully convey the idea of the present invention to those skilled in the art. Also, the thickness and size of each layer in the drawings are exaggerated for the convenience of explanation and clarity.

[0030] The terms used in this specification are for explaining specific embodiments and are not for limiting the present invention. As used in this specification, the singular form can include the plural form unless the context clearly indicates otherwise. Also, when used in this specification, "comprise" and / or "comprising" identify the presence of the recited shape, number, step, operation, member, element, and / or group thereof, and do not exclude the presence or addition of one or more other shapes, numbers, operations, members, elements, and / or groups.

[0031] Hereinafter, each embodiment of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In each drawing, for example, various deformations of the illustrated shape can be expected due to manufacturing techniques and / or tolerances. Therefore, embodiments of the idea of the present invention should not be construed as being limited to the specific shape of the region shown in this specification, and should include, for example, changes in shape brought about during manufacturing.

[0032] FIG. 1 is a perspective view showing an asymmetric rolling apparatus 100 according to some embodiments of the present invention, FIG. 2 is a cross-sectional view showing the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view showing the asymmetric rolling apparatus 100 of FIG. 2.

[0033] First, as shown in FIGS. 1 to 3, the asymmetric rolling apparatus 100 according to some embodiments of the present invention can generally include a first work roll WR1 (Work Roll), a second work roll WR2, a drive roll DR, a drive device 70, a first idle roll IR1 (Idle Roll), and a first guide roll GR1 (Guide Roll).

[0034] For example, the first work roll WR1 can be a rolling roll that contacts the first surface 1a, i.e., the upper surface, of the material to be rolled 1 in the form of a panel.

[0035] Correspondingly, the second work roll WR2 contacts the second surface 1b, i.e., the lower surface, of the material to be rolled 1, and is a rolling roll having a second radius R2 larger than the first radius R1 of the first work roll WR1 so as to enable asymmetric rolling of the material to be rolled 1.

[0036] In the drawings, the first work roll WR1 is located above the material to be rolled 1, and the second work roll WR2 is located below the material to be rolled 1. However, it is not necessarily limited to this. It is also possible that the first work roll WR1 is located below the material to be rolled 1 and the second work roll WR2 is located above the material to be rolled 1. In addition to this, it is also possible that the first work roll WR1 is located on one side of the material to be rolled 1 and the second work roll WR2 is located on the other side of the material to be rolled 1.

[0037] Therefore, the material to be rolled 1 can be rolled thinly from the first thickness T to the second thickness t while passing between the first work roll WR1 and the second work roll WR2. At this time, since the radii of the two rolling rolls for rolling the material to be rolled 1 are different from each other, the shear deformation forces acting on the material to be rolled 1 act in different ways, and the structure of the material becomes denser, whereby the physical properties of the material can become more excellent.

[0038] The improvement of the physical properties of such a material can vary depending on the type, thickness, specifications, and process environment such as the process temperature of the material to be rolled 1. The diameters of the first work roll WR1 and the second work roll WR2 can be optimized and designed according to the type, thickness, specifications, and process environment such as the process temperature of the material to be rolled 1.

[0039] On the other hand, for example, the drive roll DR is a kind of auxiliary roll formed above or below the first work roll WR1 so as to be in contact with the first work roll WR1 and drive the first work roll WR1, and can be driven by the drive device 70.

[0040] Also, for example, the drive device 70 is a device for driving the second work roll WR2 and the drive roll DR, and can drive the drive roll DR and the second work roll WR2 so that the first rotational linear velocity V1 of the first work roll WR1 is the same as the second rotational linear velocity V2 of the second work roll WR2.

[0041] More specifically, for example, the driving device 70 may include a first actuator 71 including a motor or a power transmission device for driving the first work roll WR1, a second actuator 72 including a motor or a power transmission device for driving the second work roll WR2, and a drive control unit 73 for controlling the first actuator 71 and the second actuator 72.

[0042] Therefore, the first actuator 71 and the second actuator 72 can control the respective rotational angular velocities of the first work roll WR1 and the second work roll WR2, and can control the first rotational linear velocity V1 of the first work roll WR1 to be the same as the second rotational linear velocity V2 of the second work roll WR2.

[0043] In addition, the driving device 70 can also make the fourth radius R4 of the driving roll DR the same as the second radius R2 of the second work roll WR2 so that the first rotational linear velocity V1 of the first work roll WR1 is the same as the second rotational linear velocity V2 of the second work roll WR2, and can drive the driving roll DR and the second work roll WR2 in the same or opposite directions at the same rotational angular velocity.

[0044] Here, the meaning of "the same" should be understood as a substantial identity including not only a complete identity but also an identity within a process margin due to inevitable errors inherent in the characteristics of the mechanical device even though the operator controls the signals of the control unit with the intention of making the angular velocities of both rolls the same. Such "the same" of the rotational linear velocities of the first work roll WR1 and the second work roll WR2 can also be applied in the same meaning hereinafter.

[0045] However, in other embodiments of the present invention, the first rotational linear velocity V1 of the first work roll WR1 and the second rotational linear velocity V2 of the second work roll WR2 may not be the same for many purposes. For example, in order to provide a difference in shear deformation rate above and below the material to be rolled 1, or to control the warp of the material to be rolled 1, etc., the first rotational linear velocity V1 and the second rotational linear velocity V2 may be controlled to have a slight difference, for example, within a range of 10%.

[0046] Also, although not shown in the drawings, in addition to motors, various power transmission devices such as a combination of gears, a combination of belts and pulleys, a combination of chains and sprocket wheels, a combination of wire pulleys, and a combination of a movable table and a lead screw can be applied to the first actuator 71 and the second actuator 72.

[0047] Also, for example, the first idle roll IR1 may be a kind of auxiliary rolling roll formed in front of or behind the first work roll WR1 so as to contact the first work roll WR1 so as not to interfere with the linear movement path of the material to be rolled 1 and support the first work roll WR1 in the front-rear direction.

[0048] Here, the first idle roll IR1 may be a rolling roll formed at a distance of the first interval D1 from the drive roll DR and having a third radius R3 smaller than the first radius R1 of the first work roll WR1 so as not to interfere with the rolling path of the material to be rolled 1.

[0049] To give a more specific example, the first idle roll IR1 may include a first-1 idle roll IR1-1 formed in front of the first work roll WR1 and having a second height H2 of the second central axis C2 formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1, and a first-2 idle roll IR1-2 formed behind the first work roll WR1 and having a third height H3 of the third central axis C3 formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1.

[0050] Therefore, the first idle roll IR1-1 and the 1-2 idle roll IR1-2 can more firmly support the first work roll WR1 in the front-back direction, that is, not only in front of the first work roll WR1 but also in the front-back direction, that is, behind the first work roll WR1, so that the first work roll WR1 can rotate more stably.

[0051] Also, for example, the first guide roll GR1 may be a kind of auxiliary rolling roll formed in front of or behind the first idle roll IR1 so as to be in contact with the first idle roll IR1 and support the first idle roll IR1 in the front-back direction or in the circumferential direction of the drive roll DR.

[0052] Such a first guide roll GR1 may be a rolling roll that contacts the drive roll DR for a more firm rotational support force and has a fifth radius R5 that is larger than the first radius R1 of the first work roll WR1 or larger than the third radius R3 of the first idle roll IR1 so as not to interfere with the rolling path of the material to be rolled 1.

[0053] To give a more specific example, the first guide roll GR1 may include a first-1 guide roll GR1-1 formed in front of the first work roll WR1, where the fourth height H4 of the fourth central axis C4 is formed higher than the first height H1 of the first central axis C1 of the first work roll WR1, and a first-2 guide roll GR1-2 formed behind the first work roll WR1, where the fifth height H5 of the fifth central axis C5 is formed higher than the first height H1 of the first central axis C1 of the first work roll WR1.

[0054] Therefore, the first-1 guide roll GR1-1 and the 1-2 guide roll GR1-2 can more firmly support the first work roll WR1 and the first idle roll IR1 not only in front of the first work roll WR1 but also in the front-back direction, that is, behind the first work roll WR1, so that they can rotate more stably.

[0055] Therefore, according to the present invention, the first work roll WR1 can be supported in a triangular arrangement so as to be in contact with each other by using the first idler roll IR1 and the first guide roll GR1 that can support the first work roll WR1 in the front-rear direction. Thus, it can firmly cope with the reaction force in the front-rear direction, minimize the deformation of the first work roll WR1 in the front-rear direction, and through this, increase the strength and durability of the components, prevent defective phenomena, and precisely control the shape of the produced sheet material.

[0056] FIG. 4 is a cross-sectional view showing an asymmetric rolling apparatus 200 according to another embodiment of a part of the present invention.

[0057] As shown in FIG. 4, the first guide roll GR1 of the asymmetric rolling apparatus 200 according to another embodiment of a part of the present invention can be formed at a distance of the second interval D2 from the drive roll DR.

[0058] Therefore, it is also possible to pass rolling oil between the second intervals D2 by using the first guide roll GR1 separated from the drive roll DR, and to induce cooling and smooth driving of each rolling roll.

[0059] FIG. 5 is a cross-sectional view showing an asymmetric rolling apparatus 300 according to still another embodiment of a part of the present invention.

[0060] As shown in FIG. 5, the asymmetric rolling apparatus 300 according to still another embodiment of a part of the present invention further includes a second idler roll IR2 formed in front of or behind the first guide roll GR1 so as to be in contact with the first guide roll GR1 and support the first guide roll GR1 in the front-rear direction or the circumferential direction of the drive roll DR, and a second guide roll GR2 formed in front of or behind the second idler roll IR2 so as to be in contact with the second idler roll IR2 and support the second idler roll IR2 in the front-rear direction or the circumferential direction of the drive roll DR.

[0061] To give a more specific example, the second idle roll IR2 can include a second-1 idle roll IR2-1 formed in front of the first guide roll GR1 and a second-2 idle roll IR2-2 formed behind the first guide roll GR1.

[0062] Also, the second guide roll GR2 can include a second-1 guide roll GR2-1 formed in front of the second idle roll IR2 and a second-2 guide roll GR2-2 formed behind the second idle roll IR2.

[0063] Therefore, the first work roll WR1 can be supported in a multiple triangular arrangement so as to be in contact with each other using the first idle roll IR1, the first guide roll GR1, the second idle roll IR2, and the second guide roll GR2 that can support the first work roll WR1 in the front-rear direction. Thus, it can more firmly respond to the reaction force in the front-rear direction, further minimize the deformation of the first work roll WR1 in the front-rear direction. Through this, the strength and durability of the components can be further increased, defective phenomena can be prevented, and the shape of the produced sheet material can be more precisely controlled.

[0064] FIG. 6 is a cross-sectional view showing the first work roll WR1 of the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 7 is an enlarged cross-sectional view showing a part of the first work roll WR1 of the asymmetric rolling apparatus 100 of FIG. 6.

[0065] As shown in FIGS. 1 to 7, the first work roll WR1 of the asymmetric rolling apparatuses 100, 200, 300 according to many embodiments of the present invention can include a rolling part 10 that contacts the material to be rolled 1 so as to roll the material to be rolled 1, a joint part 20 formed in the rolling part 10 so that the rolling part 10 can perform an articulating motion in the front-rear direction, and a sliding part 30 formed in the rolling part 10 so that the rolling part 10 can slide in the axial direction while rotating.

[0066] For example, the rolling part 10 of the first work roll WR1 may be a portion that is formed in an overall cylindrical shape and contacts the first surface 1a of the material to be rolled 1.

[0067] Also, for example, as shown in FIG. 6, the joint part 20 of the first work roll WR1 is formed between the rolling part 10 and the sliding part 30. As shown in FIG. 7, at least one of the joint balls 21, angular contact bearings 22, and combinations thereof that are installed in a shaft hole part 10a formed in a concave shape at the end of the rolling part 10 so that the rolling part 10 can perform a joint motion may be selected and configured.

[0068] Here, as shown in the enlarged right part of FIG. 7, a steel ball bearing that is inserted into the shaft hole part 10 may be applied to the joint ball 21. For the angular contact bearing 22, an angular contact ball bearing or an angular contact roller bearing composed of an inner ring 221 protruding on one side, an outer ring 222 protruding on the other side, and balls 223 and rollers installed therebetween so as to withstand a thrust load may be applied.

[0069] However, such joint balls 21 and angular contact bearings 22 are not necessarily limited to the drawings, and a very diverse form of bearing that can rotate and withstand all of the rolling load and thrust load may be applied.

[0070] Also, for example, as shown in FIG. 7, the sliding portion 30 of the first work roll WR1 includes a sleeve 31 that is loosely inserted into the shaft hole portion 10a of the rolling portion 10, a sleeve rotating shaft 32 that is rotatably installed on the sleeve 31, a guide bush 33 that is fixed to the cassette body 81 or rotatably formed and supports the sleeve rotating shaft 32 so as to be rotatable and slidable, and a damping device 34 that is installed on the sleeve rotating shaft 32 and enables the original state restoration of the sliding position of the sleeve rotating shaft 32 at no load while alleviating vibration and noise.

[0071] For a more specific example, the damping device 34 may include a compression spring 35 installed on one side of the sleeve rotating shaft 32 and having an elastic restoring force acting when contracting, and a tension spring 36 installed on the other side of the sleeve rotating shaft 32 and having an elastic restoring force acting when extending.

[0072] Therefore, the sleeve 31 is rotatably installed independently of the rolling portion 10, and the sleeve rotating shaft 32 is rotatable and slidable with reference to the guide bush 33. Thus, together with the joint movement of the joint portion 20 described above, sliding rotation in the axial direction can be performed, and the original state restoration of the sliding position of the sleeve rotating shaft 32 at no load can be enabled by using the damping device 34.

[0073] Here, the sleeve 31, the sleeve rotating shaft 32, the guide bush 33, and the damping device 34 are respectively installed at the left and right ends of the rolling portion 10. When the rolling portion 10 slides to the left, a restoring force acts in the right direction, and when the rolling portion 10 slides to the right, a restoring force acts in the left direction, enabling the original state restoration of the sliding position.

[0074] Therefore, such a damping device 34 can serve as a damper that repeats contraction and extension while corresponding to the thrust load, can reduce the bearing load concentrated on the bearing, and can prevent the bearing from being damaged.

[0075] In addition, as shown in FIG. 7, the sliding portion 30 of the first work roll WR1 may further include at least one deep groove ball bearing 37 formed between the sleeve 31 and the sleeve rotating shaft 32, and a thrust bearing 38 formed between the guide bush 33 and the bush cap BC.

[0076] More specifically, as shown in the enlarged middle portion of FIG. 7, the deep groove ball bearing 37 includes an inner ring 371 formed with a groove, an outer ring 372 formed with a groove, and balls 373 inserted between the grooves, and can minimize the frictional force generated between the sleeve 31 and the sleeve rotating shaft 32 when a rolling load occurs.

[0077] Also, for example, as shown in the enlarged left portion of FIG. 7, the thrust bearing 38 includes a fixed ring 381 installed on the bush cap BC, a rotating ring 382 installed on the guide bush 33 side, and balls 383 installed therebetween, and can minimize the frictional force generated between the fixed bush cap BC and the guide bush 33 when the guide bush 33 rotates when a rotational load occurs.

[0078] However, such deep groove ball bearings 37 and thrust bearings 38 are not necessarily limited to the drawings, and various forms of bearings that can rotate and withstand all of the rolling load and thrust load can be applied.

[0079] Therefore, by using the joint parts 20 and the sliding parts 30 in various forms appropriately arranged for each part, all of the articulating motion, rotational motion, and axial sliding of the rolling part 10 are possible. Through this, even when a large deformation occurs in the first work roll WR1 due to a strong rolling load, it is possible to actively respond to this to achieve alignment to a fixed position and restoration to the original state. Through this, the strength and durability of the parts can be increased, defective phenomena can be prevented, and the shape of the produced sheet material can be precisely controlled.

[0080] FIG. 8 is a cross-sectional view showing the first idle roll IR1 of the asymmetric rolling apparatus 100 of FIG. 1.

[0081] As shown in FIG. 8, the first idle roll IR1 of the asymmetric rolling apparatuses 100, 200, 300 according to many embodiments of the present invention includes an idle part IRa that contacts the first work roll WR1, a tapered part IRb whose radius gradually decreases from the idle part IRa to alleviate the corner stress concentration phenomenon, a cap CP installed on the rotating shaft to fix the axial position and prevent bearing detachment, and a deep groove ball bearing 39 installed on the rotating shaft.

[0082] As shown in FIG. 8, three such deep groove ball bearings 39 are installed on the left side and four are installed on the right side due to the stress concentration phenomenon, and the number of installed bearings can vary from each other.

[0083] The deep groove ball bearing 39 in FIG. 8 enables the same configuration and role as the deep groove ball bearing 37 in FIG. 7, and a detailed description thereof is omitted.

[0084] FIG. 9 is a cross-sectional view showing the first guide roll GR1 of the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 10 is a cross-sectional view showing a state in which the rolling oil 2 is directly injected onto the first work roll WR1 through the rolling oil injection groove part 41 of the asymmetric rolling apparatus 100 of FIG. 9.

[0085] As shown in FIGS. 9 and 10, the first guide roll GR1 of the asymmetric rolling apparatuses 100, 200, and 300 according to many embodiments of the present invention is formed with at least one rolling oil injection groove portion 41, a contact portion 40 that contacts the first idle roll IR1, a shaft portion 50 having one end fixed to the cassette body 81 and the other end inserted into a recessed portion 40a formed in a concave shape at the end of the contact portion 40, and at least one self-aligning bearing 60 formed between the contact portion 40 and the shaft portion 50 so that the rotation centers of the contact portion 40 are aligned and can rotate.

[0086] Here, the self-aligning bearing 60 may be configured such that the inner ring is tiltable with respect to the outer ring, and balls or rollers are installed in a double layer with an inclination so that the inner ring can be restored to its original position during tilting.

[0087] However, the self-aligning bearing 60 is not necessarily limited to this, and various forms of bearings that can rotate and can withstand all tilting loads can be applied.

[0088] To give a more specific example, the rolling oil injection groove portion 41 may include a circumferential groove portion formed in a ring-shaped linear groove along the circumference of the contact portion 40 so that the injected rolling oil 2 passes through the rolling oil injection groove portion 41 and is directly injected into the first work roll WR1 through a first interval D1 between the first idle roll IR1 and the drive roll DR.

[0089] Therefore, as shown in FIG. 10, the injected rolling oil 2 passes through the rolling oil injection groove portion 41, is directly injected into the first work roll WR1 through the first interval D1 between the first idle roll IR1 and the drive roll DR, the rolling oil 2 can be smoothly supplied, heat dissipation can be enhanced through this, the frictional force can be reduced, and the rolling performance can be greatly improved.

[0090] FIG. 11 is a cross-sectional view showing another example of the rolling oil injection groove portion 41 of the asymmetric rolling apparatus 100 of FIG. 1.

[0091] As shown in FIG. 11, the rolling oil injection groove portion 41 of the first guide roll GR1 may be formed in a spiral shape, a taper portion 42 for preventing corner stress concentration may be integrally formed in the contact portion 40, and a plurality of the self-aligning bearings 60 may be formed on the rotating shaft.

[0092] However, such self-aligning bearings 60 are not necessarily limited to this, and various forms of bearings that can rotate and withstand all tilting loads can be applied.

[0093] Therefore, the workpiece 1 to be rolled by the asymmetric rolling apparatuses 100, 200, and 300 of the present invention can include magnesium or a magnesium alloy having a hexagonal close-packed (HCP) structure. In recent years, magnesium, which is being studied as a next-generation lightweight member, has a density of 1.74 g / cm 3 and is lighter than iron having a density of 7.90 g / cm 3 and aluminum having a density of 2.7 g / cm 3 and can have very excellent specific strength and specific elastic modulus. In addition, it is excellent in absorption ability for vibrations, impacts, electromagnetic waves, etc., and excellent in electrical and thermal conductivity, so it can be applied not only to lightweight materials for automobiles, aircraft, etc., but also to the electronic industry fields such as mobile phones and notebook computers.

[0094] On the other hand, the workpiece 1 to be rolled by the asymmetric rolling apparatuses 100, 200, and 300 of the present invention can also be rolled a plurality of times with the same workpiece 1. Performing rolling a plurality of times in this way can be carried out to prevent problems that appear when applying a rapid reduction amount by sequentially applying a reduction amount adjusted to an appropriate level to the workpiece.

[0095] At this time, the plurality of times means that the rolled material 1 rolled by the work rolls WR1 and WR2 is re-fed into the same work rolls WR1 and WR2, or the total number of rolling passes of the rolled material 1 is two or more by passing the rolled material 1 through a plurality of work rolls WR1 and WR2 provided. At this time, the process in which the rolled material 1 is fed into the work rolls WR1 and WR2 can include all continuous and intermittent cases.

[0096] Also, the plurality of times includes not only the case where the rolled material 1 is re-fed after being physically separated from the work rolls WR1 and WR2, but also the case where the rolled material 1 is re-fed between the work rolls WR1 and WR2 when the rotational directions of the work rolls WR1 and WR2 are reversed while the rolled material 1 is still disposed between the work rolls WR1 and WR2.

[0097] Therefore, it is preferable that the first idle roll IR1 and the guide roll GR1 are disposed in front of and behind the first work roll WR1, respectively, with reference to the first work roll WR1 described above.

[0098] On the other hand, the rolled material 1 to be rolled by the asymmetric rolling apparatuses 100, 200, and 300 of the present invention is, of course, applicable not only to the magnesium or magnesium alloy described above but also to any material that controls the aggregate structure of the rolled material. For example, the present invention can be applied to all cases where the rolled material 1 is a metal material having a hexagonal close-packed crystal structure including titanium (Ti) or a titanium alloy, a metal material including aluminum and an aluminum alloy, or an Fe—Si alloy in which the crystal direction of the rolled material affects magnetic properties.

[0099] The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those having ordinary knowledge in the art will understand that various modifications and equivalent other embodiments will be possible hereinafter. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims.

Claims

1. A first work roll that contacts a first surface of the material to be rolled, a second work roll that contacts a second surface of the material to be rolled and has a second radius larger than a first radius of the first work roll so as to enable asymmetric rolling of the material to be rolled, a drive roll that contacts the first work roll and is formed above or below the first work roll so as to be able to drive the first work roll, a drive device that drives the second work roll or the drive roll, and a first idler roll that contacts the first work roll so as not to interfere with a linear movement path of the material to be rolled and is formed in front of or behind the first work roll so as to be able to support the first work roll in the front-rear direction, An asymmetric rolling device comprising the same.

2. The asymmetric rolling device according to claim 1, wherein the first idler roll is formed at a first interval from the drive roll and has a third radius smaller than the first radius of the first work roll so as not to interfere with a rolling path of the material to be rolled.

3. The first idler roll a first-1 idler roll formed in front of the first work roll and having a second height of a second central axis formed to be the same as a first height of a first central axis of the first work roll, and a first-2 idler roll formed behind the first work roll and having a third height of a third central axis formed to be the same as the first height of the first central axis of the first work roll, The asymmetric rolling device according to claim 2, comprising the same.

4. The asymmetric rolling device according to claim 1, wherein the drive device drives the drive roll and the second work roll so that a first rotational linear velocity of the first work roll is the same as a second rotational linear velocity of the second work roll.

5. The asymmetric rolling device according to claim 4, wherein the drive device is such that a first rotational linear velocity of the first work roll is the same as a second rotational linear velocity of the second work roll, a fourth radius of the drive roll is the same as the second radius of the second work roll, and the drive roll and the second work roll are driven at the same rotational angular velocity.

6. The asymmetric rolling device according to claim 1, further comprising a first guide roll that contacts the first idler roll and is formed in front of or behind the first idler roll so as to be able to support the first idler roll in the front-rear direction or in a circumferential direction of the drive roll. comprising the same.

7. The first guide roll according to claim 6, which contacts the drive roll and has a fifth radius larger than the first radius of the first work roll or larger than the third radius of the first idler roll so as not to interfere with the rolling path of the material to be rolled.

8. The first guide roll is formed in front of the first work roll, and includes a first-1 guide roll in which the fourth height of the fourth central axis is formed higher than the first height of the first central axis of the first work roll, and is formed behind the first work roll, and includes a first-2 guide roll in which the fifth height of the fifth central axis is formed higher than the first height of the first central axis of the first work roll, The asymmetric rolling apparatus according to claim 7.

9. The asymmetric rolling apparatus according to claim 6, wherein the first guide roll is formed at a second interval from the drive roll.

10. A second idler roll formed in front of or behind the first guide roll so as to contact the first guide roll and support the first guide roll in the front-rear direction or the circumferential direction of the drive roll, The asymmetric rolling apparatus according to claim 6, further comprising.

11. A second guide roll formed in front of or behind the second idler roll so as to contact the second idler roll and support the second idler roll in the front-rear direction or the circumferential direction of the drive roll, The asymmetric rolling apparatus according to claim 10, further comprising.

12. The first work roll includes a rolling part that contacts the material to be rolled so as to be able to roll the material to be rolled, a joint part formed in the rolling part so that the rolling part can perform articulation movement in the front-rear direction, and a sliding part formed in the rolling part so that the rolling part can slide in the axial direction while rotating, The asymmetric rolling apparatus according to claim 1.

13. The joint part is configured by selecting at least one of joint balls, angular contact bearings, and combinations thereof installed in a shaft hole part formed in a concave shape at an end of the rolling part, according to the asymmetric rolling apparatus of claim 12.

14. The sliding part includes a sleeve loosely inserted into the shaft hole part of the rolling part, a sleeve rotating shaft rotatably installed on the sleeve, A guide bush that is fixed to the cassette body or rotatably formed and supports the sleeve rotating shaft so that it can rotate and slide, and A damping device that is installed on the sleeve rotating shaft and enables the original state restoration of the sliding position of the sleeve rotating shaft at no load while alleviating vibration and noise, The asymmetric rolling device according to claim 13, comprising the above.

15. The damping device is A compression spring installed on one side of the sleeve rotating shaft, with an elastic restoring force acting during contraction, and A tension spring installed on the other side of the sleeve rotating shaft, with an elastic restoring force acting during extension, The asymmetric rolling device according to claim 14, comprising the above.

16. The sliding part is At least one deep groove ball bearing formed between the sleeve and the sleeve rotating shaft, and A thrust bearing formed between the guide bush and the bush cap, The asymmetric rolling device according to claim 14, further comprising the above.

17. The first guide roll is At least one or more rolling oil injection groove parts are formed, a contact part that contacts the first idle roll, One end is fixed to the cassette body, and the other end is a shaft part inserted into a concave part formed in a concave shape at the end of the contact part, and At least one self-aligning bearing formed between the contact part and the shaft part so that the rotation centers of the contact parts are aligned and can rotate, The asymmetric rolling device according to claim 6, comprising the above.

18. The rolling oil injection groove part includes a circumferential groove part formed in a ring-shaped linear groove along the circumference of the contact part so that the injected rolling oil can pass through the rolling oil injection groove part and be directly injected into the first work roll through the first interval between the first idle roll and the drive roll. The asymmetric rolling device according to claim 17.

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