Asymmetric rolling apparatus and cassette device

Abstract

The present disclosure relates to an asymmetric rolling apparatus and a cassette device capable of enhancing a physical property of materials and may include: a first work roll contacting a first surface of a material to be rolled; a second work roll contacting a second surface of the material to be rolled and having a second radius greater than a first radius of the first work roll so as to asymmetrically roll the material to be rolled; a drive roll contacting the first work roll and formed above or below the first work roll so as to drive the first work roll; a driving device driving the second work roll or the drive roll; a cassette device contacting the first work roll and supporting the first work roll in a longitudinal direction of the material.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an asymmetric rolling apparatus and a cassette device, and more specifically to an asymmetric rolling apparatus and a cassette device capable of enhancing a physical property of materials.BACKGROUND

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

[0003] According to such change in the microstructure of the material to be rolled, a texture in which a crystal is preferentially oriented in an azimuth direction is formed. The texture shown by such rolling has a very close relationship with the physical property of materials such as formability of the material to be rolled.

[0004] Therefore, by controlling the texture of the material to be rolled in the rolling process, the physical property of materials such as formability of the material to be rolled after rolling may be improved.

[0005] Conventionally, in order to improve the physical property of materials, an asymmetric rolling technology using at least one pair of work rolls having different radii has been developed so that shear deformation may be easily generated even in materials having poor formability at room temperature.SUMMARYTechnical Problem

[0006] However, in the conventional asymmetric rolling technology, there were many problems that a small work roll is easily deformed due to action of a strong reaction force in the longitudinal direction of a material, that is, in a travel direction of a material to be rolled in a work roll having a small radius during a rolling process, and various defective phenomena problems such as an uneven wave phenomenon, a bucking phenomenon, an uneven thickness phenomenon, a distortion phenomenon, or a camber phenomenon may occur on the material to be rolled during the process, and the work roll is displaced from the original position or is broken due to severe deformation of the work roll beyond an elastic range.

[0007] The present disclosure is designed to solve various problems including the above-mentioned problems, and directed to providing of an asymmetric rolling apparatus and a cassette device that may firmly respond to a reaction force of the longitudinal direction by using the cassette device capable of supporting the first work roll in the longitudinal direction and may be aligned and returned to the original position in an active response even when a deformation occurs in the first work roll. However, these problems are exemplary and the scope of the present disclosure is not limited thereto.Technical Solution

[0008] An asymmetric rolling apparatus according to the present disclosure for solving the above problem may include: a first work roll contacting a first surface of a material to be rolled; a second work roll contacting a second surface of the material to be rolled and having a second radius greater than a first radius of the first work roll so as to asymmetrically roll the material to be rolled; a drive roll contacting the first work roll and formed above or below the first work roll so as to drive the first work roll; a driving device driving the second work roll or the drive roll; and a cassette device contacting the first work roll so as not to interfere with a linear movement path of the material to be rolled and supporting the first work roll in a longitudinal direction of the material.

[0009] In addition, according to the present disclosure, the cassette device may include: a cassette body supporting the first work roll so as to rotate freely; and a first idle roll formed on the cassette body so as to rotate freely, contacting the first work roll and formed at a front or a back of the first work roll so as to support the first work roll in a longitudinal direction of the material.

[0010] In addition, according to the present disclosure, the first idle roll may include: a 1-1 idle roll formed at the front of the first work roll, and of which a second height of a second central axis is formed to be the same as a first height of a first central axis of the first work roll; and a 1-2 idle roll formed at the back of the first work roll, and of which a third height of a third central axis is formed to be the same as the first height of the first central axis of the first work roll.

[0011] In addition, according to the present disclosure, the cassette device may further include a first guide roll formed on the cassette body so as to rotate freely, contacting the first idle roll, and formed at a front or at a back of the first idle roll so as to support the first idle roll in the longitudinal direction of the material or in a circumferential direction of the drive roll.

[0012] In addition, according to the present disclosure, the first guide roll may include: a 1-1 guide roll formed at the front of the first work roll, and of which a fourth height of a fourth central axis is formed to be greater than a first height of a first central axis of the first work roll; and a 1-2 guide roll formed at the back of the first work roll, and of which a fifth height of a fifth central axis is formed to be greater than the first height of the first central axis of the first work roll.

[0013] In addition, according to the present disclosure, the cassette device may further include a plurality of push roll units formed at a push bar installed at a front or a back of the cassette body and disposed at a certain interval so as to support at least one of the first work roll, the first idle roll, and the first guide roll in the longitudinal direction of the material or in the circumferential direction of the drive roll.

[0014] In addition, according to the present disclosure, the push roll unit may include: at least one push roll rolling and rotating in contact with any one of the first work roll, the first idle roll, and the first guide roll; a movable base supporting the push roll so as to rotate freely; and a movable base forward-backward device installed at the push bar and moving the movable base forward and backward.

[0015] In addition, according to the present disclosure, the movable base forward-backward device may include: a driving device including at least one of a driving motor, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator; and a control unit applying a control signal to the driving device so that pressing force of the plurality of push rolls is uniform.

[0016] In addition, according to the present disclosure, the driving device may drive each of 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.

[0017] In addition, according to the present disclosure, the driving device may drive the drive roll and the second work roll at the same rotational angular velocity, and a fourth radius of the drive roll and the second radius of the second work roll are the same as each other 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.

[0018] In addition, according to the present disclosure, the first work roll may include: a rolling portion contacting the material to be rolled so as to roll the material to be rolled; a joint portion formed in the rolling portion so that the rolling portion is joint-moved articulated in the longitudinal direction of the material; and a sliding portion formed in the rolling portion so that the rolling portion slides in an axial direction while rotating.

[0019] In addition, according to the present disclosure, the joint portion may be formed by selecting at least one of a joint ball, an angular contact bearing, and combinations thereof, which is installed in a shaft hole portion concavely formed at an end portion of the rolling portion.

[0020] In addition, according to the present disclosure, the sliding portion may include: a sleeve loosely inserted into the shaft hole portion of the rolling portion; a sleeve rotation shaft installed on the sleeve so as to rotate freely; a guide bush fixed to a cassette body or formed so as to rotate freely and supporting the sleeve rotation shaft so as to be rotatable and slidable; and a damping device installed on the sleeve rotation shaft and returning a sliding position of the sleeve rotation shaft when no load is applied while alleviating vibration and noise.

[0021] In addition, according to the present disclosure, the damping device may include: a compression spring installed at one side of the sleeve rotation shaft and an elastic restoring force acts thereon during compression; and an extension spring installed at the other side of the sleeve rotation shaft and an elastic restoring force acts thereon during expansion.

[0022] In addition, according to the present disclosure, the sliding portion may further include: at least one deep groove ball bearing formed between the sleeve and the sleeve rotation shaft; and a thrust bearing formed between the guide bush and a bush cap.

[0023] In addition, according to the present disclosure, the first guide roll may include: a contact portion in which at least one rolling oil injecting groove portion is formed and contacting the first idle roll; a shaft portion in which one end portion is fixed to a cassette body and the other end portion is inserted into a concave portion concavely formed at an end portion of the contact portion; and at least one self-aligning bearing formed between the contact portion and the shaft portion so that a rotation center of the contact portion is aligned and rotated.

[0024] In addition, according to the present disclosure, the rolling oil injecting groove portion may include a circumferential linear groove portion formed in a ring-type linear groove shape along a circumference of the contact portion so that an injected rolling oil passes through the rolling oil injecting groove portion, passes a first gap between the first idle roll and the drive roll, and is directly injected into the first work roll.

[0025] Meanwhile, a cassette device according to the present disclosure for solving the above problem may include: a cassette body; a first idle roll formed on the cassette body so as to rotate freely, contacting a first work roll, and formed at a front or a back of the first work roll so as to support the first work roll in a longitudinal direction of the material; a first guide roll formed on the cassette body so as to rotate freely, contacting the first idle roll, and formed at a front or at a back of the first idle roll so as to support the first idle roll in the longitudinal direction of the material or in a circumferential direction of a drive roll; and a plurality of push roll units formed at a push bar installed at a front or a back of a cassette body and disposed at a certain interval so as to support at least one of the first work roll, the first idle roll, and the first guide roll in the longitudinal direction of the material or in the circumferential direction of the drive roll.ADVANTAGEOUS EFFECTS

[0026] According to various embodiments of the present disclosure as described above, it is possible to firmly respond to a reaction force of the longitudinal direction by using a cassette device capable of supporting a first work roll in the longitudinal direction, to minimize the deformation of the longitudinal direction of the first work roll, and to be aligned and returned to the original position in an active response even when a deformation occurs in the first work roll, and thereby increasing the strength and durability of components and precisely controlling a shape of a plate material produced by preventing a defective phenomenon. However, the scope of the present disclosure is not limited by these effects.BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a perspective view showing an asymmetric rolling apparatus according to some embodiments of the present disclosure.

[0028] FIG. 2 is a perspective view showing a cassette device of the asymmetric rolling apparatus of FIG. 1.

[0029] FIG. 3 is a planar view showing the cassette device of the asymmetric rolling apparatus of FIG. 2.

[0030] FIG. 4 is a cross-sectional view showing the cassette device of the asymmetric rolling apparatus of FIG. 3.

[0031] FIG. 5 is a side cross-sectional view showing the asymmetric rolling apparatus of FIG. 1.

[0032] FIG. 6 is an enlarged side cross-sectional view showing the asymmetric rolling apparatus of FIG. 5.

[0033] FIG. 7 is a cross-sectional view showing a first work roll of the asymmetric rolling apparatus of FIG. 1.

[0034] FIG. 8 is an enlarged cross-sectional view showing a part of the first work roll of the asymmetric rolling apparatus of FIG. 7.

[0035] FIG. 9 is a cross-sectional view showing a first idle roll of the asymmetric rolling apparatus of FIG. 1.

[0036] FIG. 10 is a cross-sectional view showing a first guide roll of the asymmetric rolling apparatus of FIG. 1.

[0037] FIG. 11 is a cross-sectional view showing a state in which rolling oil is directly injected into a first work roll through a rolling oil injecting groove portion of the asymmetric rolling apparatus of FIG. 10.

[0038] FIG. 12 is a cross-sectional view showing another example of the rolling oil injecting groove portion of the asymmetric rolling apparatus of FIG. 1.MODE FOR INVENTION

[0039] Hereinafter, various preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0040] Various embodiments of the present disclosure may be embodied in many different forms and should not be construed as being limited to the example embodiments set forth herein. Rather, these example embodiments of the disclosure are provided so that this disclosure will be thorough and complete and will convey inventive concepts of the disclosure to those skilled in the art. Also, in the drawings, the thicknesses or sizes of layers are exaggerated for clarity.

[0041] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and / or “comprising” used herein specify the presence of stated shapes, numbers, steps, operations, members, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other shapes, numbers, steps, operations, members, elements, and / or groups thereof.

[0042] Embodiments of the disclosure are described herein with reference to schematic illustrations of idealized embodiments (and intermediate structures) of the disclosure. In the drawings, for example, according to the manufacturing technology and / or tolerance, variations from the illustrated shape may be expected. Thus, the embodiments of the disclosure should not be construed as limited to the particular shapes of regions illustrated herein, but are to include deviations in shapes that result, for example, from manufacturing.

[0043] FIG. 1 is a perspective view showing an asymmetric rolling apparatus 100 according to some embodiments of the present disclosure.

[0044] First, as shown in FIG. 1, the asymmetric rolling apparatus 100 according to some embodiments of the present disclosure may broadly include a first work roll WR1, a second work roll WR2, a drive roll DR, a driving device 70, and a cassette device 80.

[0045] For example, the first work roll WR1 may be a rolling roll contacting a first surface 1a, that is, an upper surface of a material to be rolled 1 having a panel shape.

[0046] The second work roll WR2 corresponding to this may be a rolling roll contacting a second surface 1b, that is, a lower surface of the material to be rolled 1, and may have a second radius R2 greater than a first radius R1 of the first work roll WR1 so as to asymmetrically roll the material to be rolled 1.

[0047] In the drawing, the first work roll WR1 is positioned above the material to be rolled 1, and the second work roll WR2 is positioned below the material to be rolled 1, but it is not necessarily limited thereto, and the first work roll WR1 may be positioned below the material to be rolled 1, and the second work roll WR2 may be positioned above the material to be rolled 1. Alternatively, the first work roll WR1 may be positioned at one side of the material to be rolled 1, and the second work roll WR2 may be positioned at the other side of the material to be rolled 1.

[0048] Therefore, the material to be rolled 1 may be rolled thinly from a first thickness T to a second thickness t by passing through between the first work roll WR1 and the second work roll WR2, and at this time, since radii of two rolling rolls for rolling the material to be rolled 1 are different from each other, a shear deformation force acting on the material to be rolled 1 may act differently from each other to make a structure of the material more dense, and accordingly, the physical property of materials may be more enhanced.

[0049] Such enhancement of the physical property of materials may vary depending on a type, thickness, specification, process environment such as process temperature, etc. of the material to be rolled 1, and thus a diameter or the like of the first work roll WR1 and the second work roll WR2 may be optimized and designed according to the type, thickness, specification, process environment such as process temperature, etc. of the material to be rolled 1.

[0050] Meanwhile, for example, the drive roll DR may be a kind of an auxiliary roll contacting the first work roll WR1 and formed above or below the first work roll WR1 so as to drive the first work roll WR1 and may be driven by the driving device 70.

[0051] In addition, for example, the driving device 70 may be a device driving the second work roll WR2 and the drive roll DR, and may drive each of the drive roll DR and the second work roll WR2 so that a first rotational linear velocity V1 of the first work roll WR1 is the same as a second rotational linear velocity V2 of the second work roll WR2.

[0052] More specifically, for example, the driving device 70 may include a first actuator 71 including a motor for driving the first work roll WR1 or a power transmission device, a second actuator 72 including a motor for driving the second work roll WR2 or a power transmission device, and a drive control unit 73 for controlling the first actuator 71 and the second actuator 72.

[0053] In addition, although not shown, various power transmission devices such as a gear combination, a belt pulley combination, a chain sprocket wheel combination, a wire pulley combination, a movable base and a screw rod combination, in addition to a motor may be applied to the first actuator 71 and the second actuator 72.

[0054] In addition, for example, the cassette device 80 may be a structure contacting the first work roll WR1 and supporting the first work roll WR1 in the longitudinal direction of the material, and the cassette device 80 may not only support the first work roll WR1 in the longitudinal direction of the material, but may also precisely control the shape of the material to be rolled 1 by precisely adjusting the magnitude of the reaction force that supports each part.

[0055] FIG. 2 is a perspective view showing a cassette device 80 of the asymmetric rolling apparatus 100 of FIG. 1, FIG. 3 is a planar view showing the cassette device 80 of the asymmetric rolling apparatus 100 of FIG. 2, FIG. 4 is a cross-sectional view showing the cassette device 80 of the asymmetric rolling apparatus 100 of FIG. 3, FIG. 5 is a side cross-sectional view showing the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 6 is an enlarged side cross-sectional view showing the asymmetric rolling apparatus 100 of FIG. 5.

[0056] More specifically, as shown in FIGS. 1 to 6, the cassette device 80 is formed so as not to interfere with a linear movement path of the material to be rolled and may include a cassette body 81 supporting the first work roll WR1 so as to rotate freely, a first idle roll IR1 formed on the cassette body 81 so as to rotate freely, contacting the first work roll WR1 and formed at a front or a back of the first work roll WR1 so as to support the first work roll WR1 in the longitudinal direction of the material, a first guide roll GR1 formed on the cassette body 81 so as to rotate freely, contacting the first idle roll IR1 and formed at a front or a back of the first idle roll IR1 so as to support the first idle roll IR1 in the longitudinal direction of the material or in a circumferential direction of the drive roll DR, and a plurality of push roll units 90 formed at a push bar 82 installed at a front or a back of the cassette body 81 and disposed at a certain interval so as to support at least one of the first work roll WR1, the first idle roll IR1, the first guide roll GR1 in the longitudinal direction of the material or in the circumferential direction of the drive roll DR.

[0057] Here, the cassette body 81 may be a structure having sufficient strength and durability to withstand a component load and a rolling load, may be an assembly formed by assembling vertical members, horizontal members, panel members, etc. having various shapes and numbers, or may be an integral injection-molded structure.

[0058] However, the shape or the structure of the cassette body 81 is not necessarily limited to the drawing, and a wide variety of forms of cassette frame structures for withstanding the component load and the rolling load may all be applied.

[0059] In addition, for example, the first idle roll IR1 may include a 1-1 idle roll IR1-1 formed at the front of the first work roll WR1, and of which a second height H2 of a second central axis C2 is formed to be the same as a first height H1 of a first central axis C1 of the first work roll WR1, and a 1-2 idle roll IR1-2 formed at the back of the first work roll WR1, and of which a third height H3 of a third central axis C3 is formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1.

[0060] In addition, for example, the first guide roll GR1 may include a 1-1 guide roll GR1-1 formed at the front of the first work roll WR1, and of which a fourth height H4 of a fourth central axis C4 is formed to be greater than the first height H1 of the first central axis C1 of the first work roll WR1, and a 1-2 guide roll GR1-2 formed at the back of the first work roll WR1, and of which a fifth height H5 of a fifth central axis C5 is formed to be greater than the first height H1 of the first central axis C1 of the first work roll WR1.

[0061] In addition, for example, the push roll unit 90 may include at least one push roll 93 contacting any one of the first work roll WR1, the first idle roll IR1, and the first guide roll GR1, a movable base 92 supporting the push roll 93 so as to rotate freely, and a movable base forward-backward device installed at the push bar 82 and moving the movable base 92 forward and backward.

[0062] Here, the movable base forward-backward device may include an adjustment screw 91 rotatably formed at the push bar 82. However, it is not necessarily limited thereto, and various forms of the forward-backward devices capable of expansion and compression may all be applied.

[0063] That is, the movable base forward-backward device may include a driving device including any one of a driving motor 94 rotating the adjustment screw 91, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator, and a control unit 95 applying a control signal to the driving device so that a pressing force of the plurality of push rolls 93 is uniform.

[0064] Here, in order for the movable base 92 to stably press the first guide roll GR1 when pressing in the longitudinal direction of the material, two push rolls 83 may be installed at the upper and lower portions of the movable base 92, and a joint portion (not shown) or the like may be installed on the movable base 92 so that the pressing force is evenly distributed to each of the push rolls 83.

[0065] Therefore, for example, when a worker manually operates the adjustment screw 91 of the corresponding plurality of push roll units 90 to screw-turn, the movable base 92 may be moved forward by the adjustment screw 91, and while the corresponding push roll 93 is moved forward and a specific portion of the first guide roll GR1 is pressed in the longitudinal direction of the material, and a specific portion of the first idle roll IR1, a specific portion of the first work roll WR1 are also pressed, so that an X-axis reaction force of the first work roll WR1 may be precisely adjusted to be uniform overall. Therefore, it is possible to precisely control the rolling load acting on the material to be rolled 1 by precisely controlling the X-axis reaction force, thereby producing a high-quality product.

[0066] Meanwhile, as shown in FIG. 3, the push roll unit 90 may further include the driving motor 94 rotating the adjustment screw 91 and the control unit 95 applying the control signal to the driving motor 94 so that the pressing force of the plurality of push rolls 93 is uniform.

[0067] Therefore, instead of a worker manually screw-turning the adjustment screw 91, it may be automatically rotated by the driving motor 94, and it is also possible to perform an automated rolling process by using a sensor measuring the shape of the material to be rolled 1 or the control unit 95 optimally programmed according to various specifications of the material to be rolled 1, the rolling environment, or the like.

[0068] Here, the present disclosure is not limited to the adjustment screw 91 and the driving motor 94, and various types of hydraulic cylinders, pneumatic cylinders, electric actuators, etc. may all be applied as described above.

[0069] Therefore, as shown in FIG. 6, the first actuator 71 and the second actuator 72 may control 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 by controlling a rotational angular velocity of each of the first work roll WR1 and the second work roll WR2.

[0070] Alternatively, the driving device 70 may drive the drive roll DR and the second work roll WR2 at the same rotational angular velocity in the same or opposite direction, and a fourth radius R4 of the drive roll DR and the second radius R2 of the second work roll WR2 may be the same as each other 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.

[0071] The meaning of “same” herein should be understood as a practical meaning of identity that includes not only complete identity but also identity within a process margin caused by inevitable errors implied due to the nature of a mechanical apparatus, even though an operator controlled a signal of a control unit with an intention of making the angular velocity of both rolls the same. The term “same” with respect to the rotational linear velocity of the first work roll WR1 and the second work roll WR2 may be applied in the same meaning hereinafter.

[0072] However, in other embodiments of the present disclosure, 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 various intentions. For example, the first rotational linear velocity V1 and second rotational linear velocity V2 may be controlled to have a slight difference, for example, a difference within a range of 10%, in order to make a difference in shear deformation above and below the material to be rolled 1 or to control the warpage of the material to be rolled 1.

[0073] More specifically, for example, as shown in FIG. 6, for example, the first idle roll IR1 may be a kind of an auxiliary rolling roll contacting the first work roll WR1 and formed at a front or a back the first work roll WR1 so as to support the first work roll WR1 in the longitudinal direction of the material.

[0074] Here, the first idle roll IR1 may be a rolling roll formed to be spaced apart from the drive roll DR by a first gap D1 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.

[0075] More specifically, for example, the first idle roll IR1 may include a 1-1 idle roll IR1-1 formed at the front of the first work roll WR1, and of which a second height H2 of a second central axis C2 is formed to be the same as a first height H1 of a first central axis C1 of the first work roll WR1, and a 1-2 idle roll IR1-2 formed at the back of the first work roll WR1, and of which a third height H3 of a third central axis C3 is formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1.

[0076] Therefore, the 1-1 idle roll IR1-1 and the 1-2 idle roll IR1-2 may support the first work roll WR1 to rotate more firmly not only in the longitudinal direction, that is, at the front of the first work roll WR1, but also in the-longitudinal direction, that is, at the back of the first work roll WR1.

[0077] In addition, for example, the first guide roll GR1 may be a kind of auxiliary rolling roll contacting the first idle roll IR1 and formed at a front or a back of the first idle roll IR1 so as to support the first idle roll IR1 in the longitudinal direction of the material or in a circumferential direction of the drive roll DR.

[0078] The first guide roll GR1 may be a rolling roll contacting the drive roll DR for a more firm rotation supporting force and having a fifth radius R5 greater than the first radius R1 of the first work roll WR1 or greater 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.

[0079] More specifically, for example, the first guide roll GR1 may include a 1-1 guide roll GR1-1 formed at the front of the first work roll WR1, and of which a fourth height H4 of a fourth central axis C4 is formed to be greater than the first height H1 of the first central axis C1 of the first work roll WR1, and a 1-2 guide roll GR1-2 formed at the back of the first work roll WR1, and of which a fifth height H5 of a fifth central axis C5 is formed to be greater than the first height H1 of the first central axis C1 of the first work roll WR1.

[0080] Therefore, the 1-1 guide roll GR1-1 and the 1-2 guide roll GR1-2 may support the first work roll WR1 and the first idle roll IR1 to rotate more firmly not only in the longitudinal direction, that is, at the front of the first work roll WR1, but also in the-longitudinal direction, that is, at the back of the first work roll WR1.

[0081] Thus, according to the present disclosure, since the first work roll WR1 may be supported in a triangular arrangement to be in contact with each other using the first idle rolls IR1, the first guide rolls GR1, and the push roll unit 90 of the cassette device 80 capable of supporting the first work roll WR1 in the longitudinal direction, it is possible to firmly respond to a reaction force of the longitudinal direction, and to minimize the deformation of the longitudinal direction of the first work roll WR1, and thereby increasing the strength and durability of components and precisely controlling a shape of a plate material produced by preventing a defective phenomenon.

[0082] FIG. 7 is a cross-sectional view showing a first work roll WR1 of the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 8 is an enlarged cross-sectional view showing a part of the first work roll WR1 of the asymmetric rolling apparatus 100 of FIG. 7.

[0083] As shown in FIGS. 1 to 8, the first work roll WR1 of the asymmetric rolling apparatus 100 according to an embodiment of the present disclosure may include a rolling portion 10 contacting a material to be rolled 1 so as to roll the material to be rolled 1, a joint portion 20 formed in the rolling portion 10 so that the rolling portion 10 may be joint-moved in the longitudinal direction of the material, and a sliding portion 30 formed in the rolling portion 10 so that the rolling portion 10 slides in an axial direction while rotating.

[0084] For example, the rolling portion 10 of the first work roll WR1 may be a portion formed in an overall cylindrical shape that contacts the first surface 1a of the material to be rolled 1.

[0085] In addition, for example, as shown in FIG. 7, the joint portion 20 of the first work roll WR1 is formed between the rolling portion 10 and the sliding portion 30, and as shown in FIG. 8, the joint portion 20 may be formed by selecting at least one of a joint ball 21, an angular contact bearing 22, and combinations thereof, which is installed in a shaft hole portion 10a concavely formed at an end portion of the rolling portion 10 to enable joint movement of the rolling portion 10.

[0086] Here, as shown in an enlarged right portion of FIG. 8, a steel ball bearing inserted into the shaft hole portion 10 may be applied to the joint ball 21, and an angular contact ball bearing or an angular contact roller bearing consisting of an inner ring 221 having one side protruded and an outer ring 222 having the other end protruded so as to withstand a thrust load and balls 223 or rollers installed therebetween may be applied to the angular contact bearing 22.

[0087] However, the joint ball 21 and the angular contact bearing 22 are not necessarily limited to the drawing, and a wide variety of forms of bearings that may rotate while withstanding both the rolling load and the thrust load may be applied.

[0088] In addition, for example, as shown in FIG. 8, the sliding portion 30 of the first work roll WR1 may include a sleeve 31 loosely inserted into the shaft hole portion 10a of the rolling portion 10, a sleeve rotation shaft 32 installed on the sleeve 31 so as to rotate freely, a guide bush 33 fixed to a cassette body 81 or formed so as to rotate freely and supporting the sleeve rotation shaft 32 so as to be rotatable and slidable, and a damping device 34 installed on the sleeve rotation shaft 32 and returning a sliding position of the sleeve rotation shaft 32 when no load is applied while alleviating vibration and noise.

[0089] More specifically, for example, the damping device 34 may include a compression spring 35 installed at one side of the sleeve rotation shaft 32 and an elastic restoring force acts thereon during compression, and an extension spring 36 installed at the other side of the sleeve rotation shaft 32 and an elastic restoring force acts thereon during expansion.

[0090] Therefore, the sleeve 31 may be installed independently from the rolling portion 10 so as to rotate freely, and the sleeve rotation shaft 32 may rotate and slide based on a guide bush 33 so as to be slidable and rotatable in the axial direction together with joint movement of the joint portion 20 described above, and the damping device 34 may be used to returning the sliding position of the sleeve rotation shaft 32 when no load is applied.

[0091] Here, the sleeve 31, the sleeve rotation shaft 32, the guide bush 33 and the damping device 34 may be installed on left and right end portions of the rolling portion 10, respectively, so that 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, thereby restoring the sliding position.

[0092] Therefore, the damping device 34 may respond to the thrust load by acting as a damper that repeats compression and expansion, and may prevent damage to the bearing by reducing a bearing load concentrated on the bearing.

[0093] Alternatively, as shown in FIG. 8, 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 rotation shaft 32, and a thrust bearing 38 formed between the guide bush 33 and a bush cap BC.

[0094] More specifically, for example, as shown in an enlarged central portion of FIG. 8, the deep groove ball bearing 37 is a bearing consisting of an inner ring 371 in which a groove is formed, an outer ring 372 in which a groove is formed, and balls 373 inserted between the grooves, and may minimize a friction force generated between the sleeve 31 and sleeve rotation shaft 32 when a rolling load is generated.

[0095] In addition, for example, as shown in an enlarged left portion of FIG. 8, the thrust bearing 38 is a bearing consisting of a fixed ring 381 installed on the bush cap BC, a rotating ring 382 installed on the guide bush 33 side, and a ball 383 installed therebetween, and in a case where the guide bush 33 is rotated when a rotation load is generated, a friction force generated between the fixed bush cap BC and the guide bush 33 may be minimized.

[0096] However, the deep groove ball bearing 37 and the thrust bearing 38 are not necessarily limited to the drawings, and a wide variety of forms of bearings that may rotate while withstanding both the rolling load and the thrust load may be applied.

[0097] Therefore, by using the joint portion 20 and the sliding portion 30 of various forms suitably disposed for each portion, the joint movement, rotational movement, and sliding in axial direction of the rolling portion 10 may be made possible, and accordingly, it is possible to be aligned and returned to the original position in an active response even when a large deformation occurs in the first work roll WR1 due to a strong rolling load, and thereby increasing the strength and durability of the components and precisely controlling the shape of the plate material produced by preventing a defective phenomenon.

[0098] FIG. 9 is a cross-sectional view showing a first idle roll IR1 of the asymmetric rolling apparatus 100 of FIG. 1.

[0099] As shown in FIG. 9, the first idle roll IR1 of the asymmetric rolling apparatus 100 according to an embodiment of the present disclosure may include an idle portion IRa contacting the first work roll WR1, a tapered portion IRb having a radius that is gradually reduced from the idle portion IRa to alleviate a corner stress concentration phenomenon, a cap CP installed on the rotation shaft in order to fix the shaft position and prevent bearing detachment, and a deep groove ball bearing 39 installed on the rotation shaft.

[0100] As shown in FIG. 9, the deep groove ball bearing 39 may be installed in different numbers, such as three installed on the left and four installed on the right depending on the stress concentration phenomenon.

[0101] The deep groove ball bearing 39 of FIG. 9 may have the same configuration and function as the deep groove ball bearing 37 of FIG. 8, and a detailed description is omitted.

[0102] FIG. 10 is a cross-sectional view showing a first guide roll GR1 of the asymmetric rolling apparatus 100 of FIG. 1, and FIG. 11 is a cross-sectional view showing a state in which rolling oil 2 is directly injected into a first work roll WR1 through a rolling oil injecting groove portion 41 of the asymmetric rolling apparatus 100 of FIG. 10.

[0103] As shown in FIGS. 10 and 11, the first guide roll GR1 of the asymmetric rolling apparatus 100 according an embodiment of the present disclosure may include a contact portion 40 in which at least one rolling oil injecting groove portion 41 is formed and contacting the first idle roll IR1, a shaft portion 50 in which one end portion is fixed to a cassette body 81 and the other end portion is inserted into a concave portion 40a concavely formed at an end portion 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 a rotation center of the contact portion 40 may be aligned and rotated.

[0104] Here, the self-aligning bearing 60 may have a configuration in which an inner ring is formed to be tiltable based on an outer ring, and a ball or a roller is double installed to be inclined so as to be returned to the original position during tilting.

[0105] However, the self-aligning bearing 60 is not necessarily limited thereto, and a wide variety of forms of bearings that may rotate while withstanding the tilting load may be applied.

[0106] More specifically, for example, the rolling oil injecting groove portion 41 may include a circumferential linear groove portion formed in a ring-type linear groove shape along the circumference of the contact portion 40 so that the injected rolling oil 2 may pass through the rolling oil injecting groove portion 41, pass a first gap D1 between the first idle roll IR1 and the drive roll DR, and be directly injected into the first work roll WR1.

[0107] Therefore, as shown in FIG. 11, the injected rolling oil 2 may pass through the rolling oil injecting groove portion 41, pass the first gap D1 between the first idle roll IR1 and the drive roll DR, and be directly injected into the first work roll WR1 to facilitate the supply of the rolling oil 2, thereby increasing heat dissipation and reducing friction force to significantly improve the rolling performance.

[0108] FIG. 12 is a cross-sectional view showing another example of the rolling oil injecting groove portion 41 of the asymmetric rolling apparatus 100 of FIG. 1.

[0109] As shown in FIG. 12, the rolling oil injecting groove portion 41 of the first guide roll GR1 may be formed in a spiral shape, a tapered portion 42 for preventing corner stress concentration may be integrally formed in a contact portion 40, and a plurality of self-aligning bearings 60 may be formed on a rotation shaft.

[0110] However, the self-aligning bearing 60 is not necessarily limited thereto, and a wide variety of forms of bearings that may rotate while withstanding the tilting load may be applied.

[0111] Therefore, the material to be rolled 1 that is rolled by the asymmetric rolling apparatus 100 of the present disclosure may include magnesium or a magnesium alloy having a hexagonal close-packed (HCP) structure. Recently, magnesium, which has been studied as a next-generation lightweight member, has a density of 1.74 g / cm3 which is lighter than iron having a density of 7.90 g / cm3 or aluminum having a density of 2.7 g / cm3, and may also have excellent specific strength and specific elastic modulus. In addition, magnesium has excellent absorption capability for vibration, shock, electromagnetic wave, etc. and excellent electrical and thermal conductivity, and thus it may be applied not only to lightweight material such as automobiles and aircrafts, but also to electronic industries such as mobile phones and laptops.

[0112] Meanwhile, the material to be rolled 1 in which the rolling is performed by the asymmetric rolling apparatus 100 of the present disclosure may also roll the same material to be rolled 1 a plurality of times. Performing such plurality of times of rolling may be performed to prevent problems that occur when a sudden rolling reduction is applied by sequentially applying a rolling reduction adjusted to an appropriate level to the material to be rolled.

[0113] At this time, the plurality of times means that the total number of rolling times of the material to be rolled 1 is two or more times by putting the material to be rolled 1 rolled by the work rolls WR1, WR2 is fed into the same work rolls WR1, WR2 again or passing the material to be rolled 1 through the work rolls WR1, WR2 provided in plural, and in this case, the process of putting the rolled material to be rolled 1 into the work rolls WR1, WR2 may include both continuous or intermittent cases.

[0114] In addition, the plurality of times may also include not only a case in which the material to be rolled 1 is physically separated from the work rolls WR1, WR2 and then fed again, but also a case in which the material to be rolled 1 is fed again between the work rolls as the rotation direction of the work rolls WR1, WR2 is reversed while still positioned between the work rolls WR1, WR2.

[0115] Therefore, it is preferable that the first idle roll IR1 and the guide roll GR1 are disposed at the front and the back of the above-described first work roll WR1, respectively.

[0116] Meanwhile, it is obvious that the material to be rolled 1 in which the rolling is performed by the asymmetric rolling apparatus 100 of the present disclosure, may be applied to any material that controls the texture of the rolled material in addition to the above-described magnesium or magnesium alloy. For example, it may be applied even when the material to be rolled 1 is a metal material having a hexagonal close-packed crystal structure including titanium Ti or titanium alloy, a metal material including aluminum, aluminum alloy, or Fe-Si alloy in which the crystal orientation of the rolled material affects magnetic properties.

[0117] Meanwhile, the present disclosure may include a cassette device 80, and the configuration and function of the cassette device 80 may the same as those of the above-described asymmetric rolling apparatus 100. Therefore, detailed descriptions are omitted.

[0118] The present disclosure has been described with reference to the embodiments illustrated in the drawings, but these embodiments are merely illustrative and it should be understood by a person with ordinary skill in the art that various modifications and equivalent embodiments can be made without departing from the scope of the present disclosure. Therefore, the true technical protective scope of the present disclosure should be determined based on the technical concept of the appended claims.

Claims

1. An asymmetric rolling apparatus comprising:a first work roll contacting a first surface of a material to be rolled;a second work roll contacting a second surface of the material to be rolled and having a second radius greater than a first radius of the first work roll so as to asymmetrically roll the material to be rolled;a drive roll contacting the first work roll and formed above or below the first work roll so as to drive the first work roll;a driving device driving the second work roll or the drive roll; anda cassette device contacting the first work roll so as not to interfere with a linear movement path of the material to be rolled and supporting the first work roll in a longitudinal direction of the material.

2. The asymmetric rolling apparatus of claim 1, wherein the cassette device includes:a cassette body supporting the first work roll so as to rotate freely; anda first idle roll formed on the cassette body so as to rotate freely, contacting the first work roll and formed at a front or a back of the first work roll so as to support the first work roll in a longitudinal direction of the material.

3. The asymmetric rolling apparatus of claim 2, wherein the first idle roll includes:a 1-1 idle roll formed at the front of the first work roll, and of which a second height of a second central axis is formed to be the same as a first height of a first central axis of the first work roll; anda 1-2 idle roll formed at the back of the first work roll, and of which a third height of a third central axis is formed to be the same as the first height of the first central axis of the first work roll.

4. The asymmetric rolling apparatus of claim 2, wherein the cassette device further includes a first guide roll formed on the cassette body so as to rotate freely, contacting the first idle roll, and formed at a front or at a back of the first idle roll so as to support the first idle roll in the longitudinal direction of the material or in a circumferential direction of the drive roll.

5. The asymmetric rolling apparatus of claim 4, wherein the first guide roll includes:a 1-1 guide roll formed at the front of the first work roll, and of which a fourth height of a fourth central axis is formed to be greater than a first height of a first central axis of the first work roll; anda 1-2 guide roll formed at the back of the first work roll, and of which a fifth height of a fifth central axis is formed to be greater than the first height of the first central axis of the first work roll.

6. The asymmetric rolling apparatus of claim 4, wherein the cassette device further includes a plurality of push roll units formed at a push bar installed at a front or a back of the cassette body and disposed at a certain interval so as to support at least one of the first work roll, the first idle roll, and the first guide roll in the longitudinal direction of the material or in the circumferential direction of the drive roll.

7. The asymmetric rolling apparatus of claim 6, wherein the push roll unit includes:at least one push roll rolling and rotating in contact with any one of the first work roll, the first idle roll, and the first guide roll;a movable base supporting the push roll so as to rotate freely; anda movable base forward-backward device installed at the push bar and moving the movable base forward and backward.

8. The asymmetric rolling apparatus of claim 7, wherein the movable base forward-backward device includes:a driving device including at least one of a driving motor, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator; anda control unit applying a control signal to the driving device so that pressing force of the plurality of push rolls is uniform.

9. The asymmetric rolling apparatus of claim 1, wherein the driving device drives each of 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.

10. The asymmetric rolling apparatus of claim 9, wherein the driving device drives the drive roll and the second work roll at the same rotational angular velocity, and a fourth radius of the drive roll and the second radius of the second work roll are the same as each other 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.

11. The asymmetric rolling apparatus of claim 1, wherein the first work roll includes:a rolling portion contacting the material to be rolled so as to roll the material to be rolled;a joint portion formed in the rolling portion so that the rolling portion is joint-moved articulated in the longitudinal direction of the material; anda sliding portion formed in the rolling portion so that the rolling portion slides in an axial direction while rotating.

12. The asymmetric rolling apparatus of claim 11, wherein the joint portion is formed by selecting at least one of a joint ball, an angular contact bearing, and combinations thereof, which is installed in a shaft hole portion concavely formed at an end portion of the rolling portion.

13. The asymmetric rolling apparatus of claim 12, wherein the sliding portion includes:a sleeve loosely inserted into the shaft hole portion of the rolling portion;a sleeve rotation shaft installed on the sleeve so as to rotate freely;a guide bush fixed to a cassette body or formed so as to rotate freely and supporting the sleeve rotation shaft so as to be rotatable and slidable; anda damping device installed on the sleeve rotation shaft and returning a sliding position of the sleeve rotation shaft when no load is applied while alleviating vibration and noise.

14. The asymmetric rolling apparatus of claim 13, wherein the damping device includes:a compression spring installed at one side of the sleeve rotation shaft and an elastic restoring force acts thereon during compression; andan extension spring installed at the other side of the sleeve rotation shaft and an elastic restoring force acts thereon during expansion.

15. The asymmetric rolling apparatus of claim 14, wherein the sliding portion further includes:at least one deep groove ball bearing formed between the sleeve and the sleeve rotation shaft; anda thrust bearing formed between the guide bush and a bush cap.

16. The asymmetric rolling apparatus of claim 4, wherein the first guide roll includes:a contact portion in which at least one rolling oil injecting groove portion is formed and contacting the first idle roll;a shaft portion in which one end portion is fixed to a cassette body and the other end portion is inserted into a concave portion concavely formed at an end portion of the contact portion; andat least one self-aligning bearing formed between the contact portion and the shaft portion so that a rotation center of the contact portion is aligned and rotated.

17. The asymmetric rolling apparatus of claim 16, wherein the rolling oil injecting groove portion includes a circumferential linear groove portion formed in a ring-type linear groove shape along a circumference of the contact portion so that an injected rolling oil passes through the rolling oil injecting groove portion, passes a first gap between the first idle roll and the drive roll, and is directly injected into the first work roll.

18. A cassette device including:a cassette body;a first idle roll formed on the cassette body so as to rotate freely, contacting a first work roll and formed at a front or a back of the first work roll so as to support the first work roll in a longitudinal direction of the material;a first guide roll formed on the cassette body so as to rotate freely, contacting the first idle roll, and formed at a front or at a back of the first idle roll so as to support the first idle roll in the longitudinal direction of the material or in a circumferential direction of a drive roll; anda plurality of push roll units formed at a push bar installed at a front or a back of a cassette body and disposed at a certain interval so as to support at least one of the first work roll, the first idle roll, and the first guide roll in the longitudinal direction of the material or in the circumferential direction of the drive roll.

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