Asymmetric rolling mill

Abstract

The present invention relates to an asymmetric rolling apparatus capable of improving the physical properties of a material, and may include: a first work roll WR1 that contacts a first surface 1a of a material to be rolled 1; a second work roll WR2 that contacts a second surface 1b of the material to be rolled and has a second radius greater than the first radius of the first work roll so asymmetric rolling of the material to be rolled; a drive roll DR that contacts the first work roll and is formed above or below the first work roll so as to drive the first work roll; a drive device 70 for driving the second work roll or the drive roll; and a first idler roll IR1 that contacts the first work roll and is formed in front of or behind the first work roll so as to support the first work roll in the front-rear direction. [Effects] The deformation of the first work roll in the front-rear direction can be minimized, and even if deformation occurs, alignment to the correct position and restoration to the original state are possible, preventing defects and allowing for precise control of the shape of the sheet material.

Description

Technical Field

[0001] The present invention relates to an asymmetric rolling device, and more particularly to an asymmetric rolling device 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 rolled material can also change according to the thickness change of the rolled material.

[0003] According to such a change in the microstructure of the rolled material, first, a texture in which crystals are oriented in the azimuthal 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 rolled material.

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

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

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, conventional asymmetric rolling techniques as described above have many problems. In the rolling process, a strong reaction force acts on the work rolls, which have a relatively small radius, in the longitudinal direction, i.e., in the direction of the rolling material's movement. This can easily cause the work rolls with a small radius to deform, potentially leading to various defects in the rolling material, such as uneven wave formation, buckling, uneven thickness, distortion, or deflection to one side. The work rolls may deform more severely than their elastic range, causing them to detach from their position or break.

[0007] The present invention aims to solve many problems, including those described above, by providing an asymmetric rolling mill that can firmly respond to longitudinal reaction forces using idler rolls and guide rolls that can support the first work roll in the longitudinal direction, and that can actively respond to deformation of the first work roll to align it to its fixed position and restore it to its original state. However, the above-mentioned problems are illustrative and do not limit the scope of the present invention. [Means for solving the problem]

[0008] An asymmetric rolling apparatus according to the concept of the present invention for solving the above problems may include: 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 the first radius of the first work roll so 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 drive the first work roll; a drive device for driving 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 the linear movement path of the material to be rolled and is formed in front of or behind the first work roll so as to support the first work roll in the front-rear direction.

[0009] Furthermore, according to the present invention, the first idler roll is formed at a distance of a first interval from the drive roll and may 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] Furthermore, according to the present invention, the first idler roll may include a first-first idler roll formed in front of the first work roll, the second height of which is the second central axis of which is the same as the first height of which is the first central axis of the first work roll, and a first-second idler roll formed behind the first work roll, the third height of which is the third central axis of which is the same as the first height of which is the first central axis of the first work roll.

[0011] Furthermore, according to the present invention, the drive device can drive the drive roll and the second work roll, respectively, 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] Furthermore, according to the present invention, the drive device can drive the drive roll and the second work roll at the same rotational angular velocity 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. This is achieved by having the fourth radius of the drive roll and the second work roll drive at the same rotational angular velocity.

[0013] Furthermore, according to the present invention, a first guide roll may be formed in front of or behind the first idler roll so as to contact the first idler roll and support the first idler roll in the front-rear direction or in the circumferential direction of the drive roll.

[0014] Furthermore, according to the present invention, the first guide roll may have a fifth radius that is 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, while contacting the drive roll.

[0015] Furthermore, according to the present invention, the first guide roll may include a 1-1 guide roll formed in front of the first work roll, the 4th height of the 4th central axis being higher than the 1st height of the 1st central axis of the first work roll, and a 1-2 guide roll formed behind the first work roll, the 5th height of the 5th central axis being higher than the 1st height of the 1st central axis of the first work roll.

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

[0017] Furthermore, according to the present invention, a second idler roll may be 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 in the circumferential direction of the drive roll.

[0018] Furthermore, according to the present invention, a second guide roll may be 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 in the circumferential direction of the drive roll.

[0019] Furthermore, according to the present invention, the first work roll may include a rolling portion that contacts the material to be rolled so as to be able to roll the material to be rolled, an articulated portion formed in the rolling portion so as to be able to articulate the rolling portion in the front-rear direction, and a sliding portion formed in the rolling portion so as to be able to slide in the axial direction while rotating.

[0020] Furthermore, according to the present invention, the joint portion may be configured by selecting one or more of the following: at least a joint ball, an angular contact bearing, and a combination thereof, which are installed in a recessed shaft hole formed at the end of the rolled portion.

[0021] Furthermore, according to the present invention, the sliding portion may include a sleeve loosely inserted into the shaft hole of the rolling portion, a sleeve rotating shaft rotatably mounted on the sleeve, a guide bush fixed to the cassette body or formed to be rotatably mounted and supporting the sleeve rotating shaft so as to be rotatable and slidable, and a damping device installed on the sleeve rotating shaft that reduces vibration and noise and enables the sleeve rotating shaft to return to its original sliding position when unloaded.

[0022] Furthermore, according to the present invention, the damping device may include a compression spring installed on one side of the sleeve rotation axis and acting with an elastic restoring force when contracted, and a tension spring installed on the other side of the sleeve rotation axis and acting with an elastic restoring force when extended.

[0023] Furthermore, 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 rotation shaft, and a thrust bearing formed between the guide bush and the bush cap.

[0024] Furthermore, according to the present invention, the first guide roll may include a contact portion having at least one rolling oil injection groove formed therein and in contact with the first idler roll, a shaft portion having one end fixed to the cassette body and the other end inserted into a recess formed concavely in 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 onto 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, each idle roll and each guide roll capable of supporting the first work roll in the front-rear direction can firmly cope with the reaction force 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 this 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 parts, 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] [Figure 1] It is a perspective view showing an asymmetric rolling device according to some embodiments of the present invention. [Figure 2] It is a cross-sectional view showing the asymmetric rolling device of FIG. 1. [Figure 3] It is an enlarged cross-sectional view showing the asymmetric rolling device of FIG. 2. [Figure 4] It is a cross-sectional view showing an asymmetric rolling device according to some other embodiments of the present invention. [Figure 5] It is a cross-sectional view showing an asymmetric rolling device according to some further other embodiments of the present invention. [Figure 6] It is a cross-sectional view showing the first work roll of the asymmetric rolling device of FIG. 1. [Figure 7] It is an enlarged cross-sectional view showing a part of the first work roll of the asymmetric rolling device of FIG. 6. [Figure 8] It is a cross-sectional view showing the first idle roll of the asymmetric rolling device of FIG. 1. [Figure 9] Figure 1 is a cross-sectional view showing the first guide roll of an asymmetric rolling mill. [Figure 10] Figure 9 is a cross-sectional view showing the state in which rolling oil is directly injected into the first work roll through the rolling oil injection groove of the asymmetric rolling mill. [Figure 11] Figure 1 is a cross-sectional view showing another example of the rolling oil injection groove section of an asymmetric rolling mill. [Modes for carrying out the invention]

[0028] Many preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0029] Each embodiment of the present invention is provided to further and completely illustrate the invention to those skilled in the art, and the embodiments described below can be modified into many other forms, and the scope of the invention is not limited to these embodiments. Rather, these embodiments are provided to further enrich and complete the disclosure and to fully convey the idea of ​​the invention to those skilled in the art. Also, the thicknesses and sizes of the layers in the drawings are exaggerated for the sake of clarity and ease of explanation.

[0030] The terms used herein are for the purpose of describing specific embodiments and are not intended to limit the invention. As used herein, a singular form can include multiple forms unless the context explicitly indicates otherwise. Also, as used herein, “comprise” and / or “comprising” identify the presence of the shapes, figures, stages, actions, members, elements and / or groups thereof mentioned, and do not exclude the presence or addition of one or more other shapes, figures, actions, members, elements and / or groups thereof.

[0031] Hereinafter, each embodiment of the present invention will be described with reference to the drawings which schematically illustrate each ideal embodiment of the present invention. In each drawing, each deformation of the illustrated shape may be expected, for example, due to manufacturing techniques and / or tolerances. Therefore, embodiments of the concept of the present invention should not be construed as being limited to specific shapes in the region shown herein, and should include, for example, changes in shape that occur during manufacturing.

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

[0033] First, as shown in Figures 1 to 3, the asymmetric rolling mill 100 according to some embodiments of the present invention can be broadly divided into a first work roll WR1, a second work roll WR2, a drive roll DR, a drive unit 70, a first idle roll IR1, and a first guide roll GR1.

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

[0035] The corresponding second work roll WR2 may be a rolling roll that contacts the second surface 1b of the rolled material 1, i.e., the lower surface, and has a second radius R2 that is larger than the first radius R1 of the first work roll WR1, so asymmetric rolling of the rolled material 1 is possible.

[0036] In the drawing, the first work roll WR1 is positioned above the rolled material 1 and the second work roll WR2 is positioned below the rolled material 1. However, the drawing is not limited to this configuration. It is also possible for the first work roll WR1 to be positioned below the rolled material 1 and the second work roll WR2 to be positioned above the rolled material 1. Furthermore, it is also possible for the first work roll WR1 to be positioned on one side of the rolled material 1 and the second work roll WR2 to be positioned on the other side of the rolled material 1.

[0037] Therefore, the rolled material 1 can be rolled thinly from a first thickness T to a second thickness t as it passes between the first work roll WR1 and the second work roll WR2. In this case, since the radii of the two rolling rolls that roll the rolled material 1 are different, the shear deformation forces acting on the rolled material 1 act in different ways, making the material's structure denser, which in turn can result in superior material properties.

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

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

[0040] Furthermore, 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 respectively 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] To give a more specific example, the drive unit 70 may include a first actuator 71 including a motor or power transmission device for driving the first work roll WR1, a second actuator 72 including a motor or 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 rotational angular velocity of the first work roll WR1 and the second work roll WR2, respectively, 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.

[0043] In addition to the above, the drive unit 70 can also drive the drive roll DR and the second work roll WR2 at the same rotational angular velocity, either in the same direction or in opposite directions, such 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 the fourth radius R4 of the drive roll DR is the same as the second radius R2 of the second work roll WR2.

[0044] Here, the meaning of "identical" should be understood not only as complete identicalness, but also as a substantial identity that includes the degree of identity within the process margin resulting from unavoidable errors inherent in the characteristics of the machine, even though the operator controlled the control signal with the intention of making the angular velocity of both rolls identical. This "identical" rotational linear velocity of the first work roll WR1 and the second work roll WR2 can be applied in the same sense below.

[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 various purposes. For example, to create a difference in shear deformation rate between the upper and lower parts of the rolled material 1, or to control the warping of the rolled material 1, the first rotational linear velocity V1 and the second rotational linear velocity V2 may be controlled to have a small difference, for example, within a range of 10%.

[0046] Furthermore, although not shown in the drawings, various power transmission devices other than motors can be applied to the first actuator 71 and the second actuator 72, such as combinations of gears, combinations of belts and pulleys, combinations of chains and sprocket wheels, combinations of wire pulleys, and combinations of movable bases and threaded rods.

[0047] Furthermore, for example, the first idler roll IR1 may be a type of auxiliary rolling roll formed in front of or behind the first work roll WR1 so as to contact the first work roll WR1 without interfering with the linear movement path of the rolled material 1, and to support the first work roll WR1 in the front-rear direction.

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

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

[0050] Therefore, the 1-1 idler roll IR1-1 and the 1-2 idler roll IR1-2 can more firmly support the first work roll WR1 in the front-rear direction, i.e., in front of the first work roll WR1, as well as in the rear-rear direction, i.e., behind the first work roll WR1.

[0051] Furthermore, for example, the first guide roll GR1 may be a type of auxiliary rolling roll formed in front of or behind the first idler roll IR1 so as to contact the first idler roll IR1 and support the first idler roll IR1 in the front-rear direction or in the circumferential direction of the drive roll DR.

[0052] Such a first guide roll GR1 may be a rolling roll having 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 rolled material 1, and to contact the drive roll DR for a more robust rotational support force.

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

[0054] Therefore, the 1-1 guide roll GR1-1 and the 1-2 guide roll GR1-2 can be more firmly supported in the front-rear direction, that is, in front of the first work roll WR1, as well as in the rear-rear direction, that is, up to the first work roll WR1 and the first idle roll IR1.

[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 using the first idler roll IR1 and the first guide roll GR1, which can support the first work roll WR1 in the front-rear direction. This allows for a firm response to reaction forces in the front-rear direction, minimizes deformation of the first work roll WR1 in the front-rear direction, increases the strength and durability of the parts, prevents defects, and allows for precise control of the shape of the produced sheet material.

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

[0057] As shown in Figure 4, the first guide roll GR1 of the asymmetric rolling mill 200 according to some other embodiments of the present invention may be formed at a distance of a second interval D2 from the drive roll DR.

[0058] Therefore, it is also possible to use the first guide roll GR1, which is spaced apart from the drive roll DR, to pass rolling oil through the second gap D2, thereby facilitating the cooling and smooth operation of each rolling roll.

[0059] Figure 5 is a cross-sectional view showing an asymmetric rolling mill 300 according to yet another embodiment of the present invention.

[0060] As shown in Figure 5, an asymmetric rolling mill 300 according to yet another embodiment of a part of the present invention may further include a second idler roll IR2 formed in front of or behind the first guide roll GR1 so as to contact the first guide roll GR1 and support the first guide roll GR1 in the longitudinal direction or in 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 contact the second idler roll IR2 and support the second idler roll IR2 in the longitudinal direction or in the circumferential direction of the drive roll DR.

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

[0062] Furthermore, the second guide roll GR2 may include a second-first guide roll GR2-1 formed in front of the second idler roll IR2, and a second-second guide roll GR2-2 formed behind the second idler roll IR2.

[0063] Therefore, the first work roll WR1 can be supported in a multi-triangular arrangement using the first idler roll IR1, the first guide roll GR1, the second idler roll IR2, and the second guide roll GR2, which are capable of supporting the first work roll WR1 in the front-rear direction, so that the first work roll WR1 is in contact with each other. This allows for more robust response to front-rear reaction forces, further minimization of front-rear deformation of the first work roll WR1, thereby further increasing the strength and durability of the parts, preventing defects, and allowing for more precise control of the shape of the produced sheet material.

[0064] Figure 6 is a cross-sectional view showing the first work roll WR1 of the asymmetric rolling mill 100 in Figure 1, and Figure 7 is an enlarged cross-sectional view showing a portion of the first work roll WR1 of the asymmetric rolling mill 100 in Figure 6.

[0065] As shown in Figures 1 to 7, the first work roll WR1 of the asymmetric rolling mill 100, 200, 300 according to many embodiments of the present invention may include a rolling section 10 that contacts the material to be rolled 1 so as to be able to roll the material to be rolled 1, an articulated section 20 formed on the rolling section 10 so as to be able to articulate the rolling section 10 in the front-rear direction, and a sliding section 30 formed on the rolling section 10 so as to be able to slide axially while rotating.

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

[0067] Furthermore, as shown in Figure 6, for example, 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 Figure 7, it can be configured by selecting one or more of the following: at least a joint ball 21, an angular contact bearing 22, or a combination thereof, which is installed in a recessed shaft hole portion 10a formed at the end of the rolling portion 10 so as to enable joint movement of the rolling portion 10.

[0068] Here, as shown in the enlarged right portion of Figure 7, a steel ball bearing inserted into the shaft hole portion 10 may be applied to the joint ball 21. The angular contact bearing 22 may be an angular contact ball bearing or an angular contact roller bearing consisting of an inner ring 221 with one side protruding to withstand thrust load, an outer ring 222 with the other side protruding, and balls 223 or rollers installed between them.

[0069] However, the articulated ball 21 and angular contact bearing 22 are not necessarily limited to those shown in the drawings, and a wide variety of bearing forms can be applied that are rotatable and capable of withstanding all rolling and thrust loads.

[0070] Furthermore, as shown in Figure 7, for example, 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 rotating shaft 32 rotatably mounted on the sleeve 31, a guide bush 33 fixed to the cassette body 81 or rotatably formed to support the sleeve rotating shaft 32 so that it can rotate and slide, and a damping device 34 installed on the sleeve rotating shaft 32 that reduces vibration and noise and allows the sliding position of the sleeve rotating shaft 32 to be restored to its original state when unloaded.

[0071] To give a more specific example, the damping device 34 may include a compression spring 35 installed on one side of the sleeve rotation shaft 32, which acts as an elastic restoring force when contracted, and a tension spring 36 installed on the other side of the sleeve rotation shaft 32, which acts as an elastic restoring force when extended.

[0072] Therefore, since the sleeve 31 is rotatably installed independently of the rolling section 10, and the sleeve rotation shaft 32 can rotate and slide with respect to the guide bush 33, it is possible to perform axial sliding rotation together with the joint movement of the joint section 20 described above, and the damping device 34 makes it possible to restore the sliding position of the sleeve rotation shaft 32 to its original position when there is no load.

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

[0074] Therefore, such a damping device 34 can respond to thrust loads while acting as a damper that repeatedly contracts and expands, thereby reducing the bearing load that was concentrated on the bearing and preventing bearing damage.

[0075] In addition to the above, as shown in Figure 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 rotation shaft 32, and a thrust bearing 38 formed between the guide bush 33 and the bush cap BC.

[0076] To give a more specific example, as shown in the enlarged intermediate portion of Figure 7, the deep groove ball bearing 37 is a bearing comprising an inner ring 371 with grooves formed thereon, an outer ring 372 with grooves formed thereon, and balls 373 inserted between each groove, which can minimize the frictional force generated between the sleeve 31 and the sleeve rotating shaft 32 when a rolling load is applied.

[0077] Furthermore, as shown in the enlarged left portion of Figure 7, for example, 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 between them. When a rotational load is generated and the bearing rotates up to the guide bush 33, the frictional force generated between the fixed bush cap BC and the guide bush 33 can be minimized.

[0078] However, the deep groove ball bearing 37 and thrust bearing 38 described above are not necessarily limited to those shown in the drawings, and a wide variety of bearings can be applied that are rotatable and capable of withstanding all rolling and thrust loads.

[0079] Therefore, by using the various forms of the joints 20 and sliding parts 30 appropriately arranged in each section, the joint movement, rotational movement, and axial sliding of the rolling section 10 are all possible. Through this, even if a large deformation occurs in the first work roll WR1 due to a strong rolling load, it is possible to actively respond to this and align to the fixed position and restore to the original state. Through this, the strength and durability of the parts can be increased, defects can be prevented, and the shape of the produced sheet material can be precisely controlled.

[0080] Figure 8 is a cross-sectional view showing the first idler roll IR1 of the asymmetric rolling mill 100 shown in Figure 1.

[0081] As shown in Figure 8, the first idler roll IR1 of the asymmetric rolling mill 100, 200, 300 according to many embodiments of the present invention may include an idler portion IRa that contacts the first work roll WR1, a tapered portion IRb whose radius gradually decreases from the idler portion IRa to alleviate corner stress concentration phenomena, 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 Figure 8, due to the stress concentration phenomenon, three of these deep groove ball bearings 39 are installed on the left side and four on the right side, and the number of installed bearings can vary.

[0083] The deep groove ball bearing 39 in Figure 8 has the same configuration and function as the deep groove ball bearing 37 in Figure 7, and a detailed explanation of it is omitted.

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

[0085] As shown in Figures 9 and 10, the first guide roll GR1 of the asymmetric rolling mill 100, 200, 300 according to many embodiments of the present invention may include a contact portion 40 having at least one rolling oil injection groove 41 and in contact with the first idler roll IR1, a shaft portion 50 with one end fixed to the cassette body 81 and the other end inserted into a recess 40a formed concavely 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 relative to the outer ring, and the balls or rollers are installed in a double configuration at an angle so that it can be restored to its original position when tilted.

[0087] However, the aforementioned self-aligning bearing 60 is not necessarily limited to this, and a wide variety of bearings that are rotatable and can withstand all tilting loads can be applied.

[0088] To give a more specific example, the rolling oil injection groove 41 may include a circumferential groove formed in the shape of a ring along the circumference of the contact portion 40, so that the injected rolling oil 2 can pass through the rolling oil injection groove 41 and be directly injected into the first work roll WR1 via the first gap D1 between the first idler roll IR1 and the drive roll DR.

[0089] Therefore, as shown in Figure 10, the injected rolling oil 2 passes through the rolling oil injection groove 41 and is injected directly into the first work roll WR1 via the first gap D1 between the first idler roll IR1 and the drive roll DR, allowing for a smooth supply of the rolling oil 2. This enhances heat dissipation, reduces friction, and significantly improves rolling performance.

[0090] Figure 11 is a cross-sectional view showing another example of the rolling oil injection groove 41 of the asymmetric rolling mill 100 shown in Figure 1.

[0091] As shown in Figure 11, the rolling oil injection groove 41 of the first guide roll GR1 may be formed in a helical shape, a tapered portion 42 to prevent 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, the aforementioned self-aligning bearing 60 is not necessarily limited to this, and a wide variety of bearings that are rotatable and can withstand all tilting loads can be applied.

[0093] Therefore, the rolled material 1 rolled by the asymmetric rolling apparatus 100, 200, 300 of the present invention may include magnesium or a magnesium alloy having a hexagonal close-packed (HCP) structure. In recent years, magnesium has been studied as a next-generation lightweight material, and has a density of 1.74 g / cm³. 3 And its density is 7.90 g / cm³. 3 Iron, for example, has a density of 2.7 g / cm³. 3 Compared to aluminum, it is lighter and possesses excellent specific strength and specific modulus of elasticity. Furthermore, it has excellent absorption capabilities against vibration, shock, and electromagnetic waves, and excellent electrical and thermal conductivity, so it can be applied not only as a lightweight material for automobiles and aircraft, but also in the electronics industry, such as for mobile phones and notebook computers.

[0094] On the other hand, the rolled material 1 that is rolled by the asymmetric rolling mills 100, 200, and 300 of the present invention can also be rolled multiple times. Performing rolling multiple times in this manner can be done to prevent problems that may arise when a sudden reduction is applied, by sequentially applying a reduction amount adjusted to an appropriate level to the rolled material.

[0095] In this case, "multiple times" means that the total number of times the rolled material 1 is rolled is two or more, either by feeding the rolled material 1, which has been rolled by the work rolls WR1 and WR2, back into the same work rolls WR1 and WR2, or by the rolled material 1 passing through multiple work rolls WR1 and WR2. In this case, the process of feeding the rolled material 1, which has been rolled, into the work rolls WR1 and WR2 can include both continuous and intermittent cases.

[0096] Furthermore, the number of times may include not only cases where the rolled material 1 is re-feeded after being physically separated from the work rolls WR1 and WR2, but also cases where the rolled material 1 is re-feeded between the work rolls when the rotation direction of the work rolls WR1 and WR2 is reversed while the rolled material 1 is still positioned between the work rolls WR1 and WR2.

[0097] Therefore, it is preferable that the first idle roll IR1 and the guide roll GR1 be positioned in front of and behind the first work roll WR1 described above.

[0098] On the other hand, the rolled material 1 rolled by the asymmetric rolling apparatus 100, 200, 300 of the present invention is naturally applicable to any material that controls the texture of the rolled material, in addition to the magnesium or magnesium alloys described above. For example, the invention can be applied to any material in which the rolled material 1 is a metallic material having a hexagonal close-packed crystal structure containing titanium (Ti) or a titanium alloy, a metallic material containing aluminum and an aluminum alloy, or an Fe-Si alloy in which the crystal orientation of the rolled material affects its magnetic properties.

[0099] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely illustrative, and a person with ordinary skill in the art will understand that a variety of modifications and equivalent other embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical idea of ​​the appended claims.

Claims

1. A first work roll that contacts the first surface of the rolled material, A second work roll having a second radius larger than the first radius of the first work roll, which contacts the second surface of the material to be rolled and enables 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 drive the first work roll, A drive device for driving the second work roll or the drive roll, and A first idler roll is formed in front of or behind the first work roll so as to contact the first work roll without interfering with the linear movement path of the rolled material, and so as to support the first work roll in the front-rear direction. Includes, The first work roll is, A rolling section that contacts the material to be rolled so that the material to be rolled can be rolled, A joint portion is formed in the rolling portion so as to enable joint movement in the front-rear direction of the rolling portion, A sliding portion is formed on the rolling portion so that it can slide in the axial direction while rotating, Includes, The aforementioned sliding part is, A sleeve that is loosely inserted into a concave shaft hole formed at the end of the rolled portion included in the joint portion, A sleeve rotation shaft is rotatably mounted on the aforementioned sleeve, A guide bush that is fixed to the cassette body or is rotatably formed to support the sleeve rotation axis so that it can rotate and slide, A damping device installed on the sleeve rotating shaft, which reduces vibration and noise and enables the sleeve rotating shaft to return to its original sliding position when unloaded, An asymmetric rolling mill, including one.

2. The asymmetric rolling apparatus according to claim 1, wherein the first idler roll is formed at a distance of 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 the rolling path of the material to be rolled.

3. The first idle roll is, A first idler roll formed in front of the first work roll, wherein the second height of the second central axis is formed to be the same as the first height of the first central axis of the first work roll, and A first-to-second idler roll is formed behind the first work roll, and the third height of the third central axis is formed to be the same as the first height of the first central axis of the first work roll, The asymmetric rolling apparatus according to claim 2, including the following:

4. The asymmetric rolling apparatus according to claim 1, wherein the drive device drives the drive roll and the second work roll, respectively, 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.

5. The asymmetric rolling apparatus according to claim 4, wherein the drive device drives the drive roll and the second work roll at the same rotational angular velocity 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 being the same as the second radius of the second work roll.

6. A first guide roll is formed in front of or behind the first idler roll so as to contact the first idler roll and support the first idler roll in the front-rear direction or in the circumferential direction of the drive roll, The asymmetric rolling apparatus according to claim 1, further comprising:

7. The asymmetric rolling apparatus according to claim 6, wherein the first guide roll has a fifth radius that is 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, in contact with the drive roll.

8. The first guide roll is, A first-first guide roll is formed in front of the first work roll, and the fourth height of the fourth central axis is formed to be higher than the first height of the first central axis of the first work roll, and A first-to-second guide roll is formed behind the first work roll, and the fifth height of the fifth central axis is formed to be higher than the first height of the first central axis of the first work roll, The asymmetric rolling apparatus according to claim 7, including the following:

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

10. A second idler roll is 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 in the circumferential direction of the drive roll, The asymmetric rolling apparatus according to claim 6, further comprising:

11. A second guide roll is 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 in the circumferential direction of the drive roll, The asymmetric rolling apparatus according to claim 10, further comprising:

12. The aforementioned joint portion is The asymmetric rolling apparatus according to claim 1, wherein at least one or more of the following are selected to be installed in the shaft hole: articulated balls, angular contact bearings, and combinations thereof.

13. The damping device is, A compression spring is installed on one side of the sleeve rotation shaft, and an elastic restoring force acts upon it when it is compressed, and A tension spring is installed on the other side of the sleeve rotation shaft, and an elastic restoring force acts upon it when it is extended. The asymmetric rolling apparatus according to claim 1, including the following:

14. The aforementioned sliding part is, A deep groove ball bearing formed between the sleeve and the sleeve's rotating shaft, and A thrust bearing is formed between the guide bush and the bush cap, The asymmetric rolling apparatus according to claim 1, further comprising:

15. The first guide roll is, At least one rolling oil injection groove is formed, and a contact portion that contacts the first idler roll, A shaft portion having one end fixed to the cassette body and the other end inserted into a recess formed in a concave shape at the end of the contact portion, and A self-aligning bearing is formed between the contact portion and the shaft portion so that the rotation centers of the contact portion are aligned and can rotate; The asymmetric rolling apparatus according to claim 6, including the following:

16. The asymmetric rolling apparatus according to claim 15, wherein the rolling oil injection groove portion includes a circumferential groove portion formed in the shape of 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 onto the first work roll via a first gap between the first idler roll and the drive roll.

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