Asymmetric rolling device and cassette device

Abstract

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

Description

Technical Field

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

Background Art

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

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

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

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

Summary of the Invention

Problems to be Solved by the Invention

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

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

Means for Solving the Problems

[0008] The asymmetric rolling device according to the idea of the present invention for solving the above problems may include a first work roll that contacts a first surface of the material to be rolled, a second work roll that contacts a second surface of the material to be rolled and has a second radius larger than a first radius of the first work roll so as to enable asymmetric rolling of the material to be rolled, a drive roll that contacts the first work roll and is formed above or below the first work roll so as to be able to drive the first work roll, a drive device that drives the second work roll or the drive roll, and a cassette device that contacts the first work roll so as not to interfere with a linear movement path of the material to be rolled and supports the first work roll in the longitudinal direction.

[0009] Also, according to the present invention, the cassette device can include a cassette body that rotatably supports the work roll, and a first idler roll that is rotatably formed on the cassette body, 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.

[0010] Also, according to the present invention, the first idler roll can include a first-1 idler roll that is formed in front of the first work roll and has a second height of a second central axis formed to be the same as a first height of the first central axis of the first work roll, and a first-2 idler roll that is formed behind the first work roll and has a third height of a third central axis formed to be the same as the first height of the first central axis of the first work roll.

[0011] Also, according to the present invention, the cassette device can further include a first guide roll that is rotatably formed on the cassette body, contacts the first idler roll, and is formed in front of or behind the first idler roll so as to support the first idler roll in the front-rear direction or in the circumferential direction of the drive roll.

[0012] Also, according to the present invention, the first guide roll can include a first-1 guide roll that is formed in front of the first work roll and has a fourth height of a fourth central axis formed higher than the first height of the first central axis of the first work roll, and a first-2 guide roll that is formed behind the first work roll and has a fifth height of a fifth central axis formed higher than the first height of the first central axis of the first work roll.

[0013] Further, according to the present invention, the cassette device is formed on a push bar installed on the front or rear surface of the cassette body, and at least one of the first work roll, the first idle roll, and the first guide roll can be supported in the front-rear direction or the circumferential direction of the drive roll. A plurality of push roll units arranged at regular intervals may be further included.

[0014] Further, according to the present invention, the push roll unit includes at least one push roll that contacts and rolls on any one of the first work roll, the first idle roll, and the first guide roll, a movable base that rotatably supports the push roll, and a movable base forward and backward movement device installed on the push bar for moving the movable base forward and backward.

[0015] Further, according to the present invention, the movable base forward and backward movement device includes a drive device including at least one of a drive motor, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator, and a control unit that applies a control signal to the drive device so that the pressing forces of the plurality of push rolls become uniform.

[0016] Further, according to the present invention, the drive device can drive the drive roll and the second work roll so that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll.

[0017] Further, according to the present invention, the drive device is such that the fourth radius of the drive roll is the same as the second radius of the second work roll so that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll, and the drive roll and the second work roll can be driven at the same rotational angular velocity.

[0018] Further, according to the present invention, the first work roll may include a rolling part that contacts the material to be rolled so as to be able to roll the material to be rolled, a joint part formed in the rolling part so as to enable articulation movement of the rolling part in the front-rear direction, and a sliding part formed in the rolling part so that the rolling part can slide in the axial direction while rotating.

[0019] Further, according to the present invention, the joint part may be configured by selecting at least one of a joint ball, an angular contact bearing, and a combination thereof, which are installed in a shaft hole part formed in a concave shape at an end of the rolling part.

[0020] Further, according to the present invention, the sliding part may include a sleeve loosely inserted into the shaft hole part of the rolling part, a sleeve rotating shaft rotatably installed on the sleeve, a guide bush fixed to the cassette body or rotatably formed to support the sleeve rotating shaft in a rotatable and slidable manner, and a damping device installed on the sleeve rotating shaft to enable restoration of the original sliding position of the sleeve rotating shaft at no load while alleviating vibration and noise.

[0021] Further, according to the present invention, the damping device may include a compression spring installed on one side of the sleeve rotating shaft and applying an elastic restoring force when contracting, and a tension spring installed on the other side of the sleeve rotating shaft and applying an elastic restoring force when extending.

[0022] Further, according to the present invention, the sliding part may further include at least one deep groove ball bearing formed between the sleeve and the sleeve rotating shaft, and a thrust bearing formed between the guide bush and the bush cap.

[0023] Further, according to the present invention, the first guide roll is formed with at least one or more rolling oil injection grooves, 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 concave portion formed in a concave shape at the end of the contact portion, and at least one self-aligning bearing formed between the contact portion and the shaft portion so that the rotation centers of the contact portions are aligned and can rotate.

[0024] Further, according to the present invention, the rolling oil injection groove portion can include a circumferential line groove portion formed in a ring-shaped line groove along the circumference of the contact portion so that the injected rolling oil passes through the rolling oil injection groove portion and is directly injected into the first work roll through a first interval between the first idler roll and the drive roll.

[0025] On the other hand, a cassette device according to the idea of the present invention for solving the above problems includes a cassette body, a first idler roll rotatably formed on the cassette body, contacting the first work roll, and formed in front of or behind the first work roll so as to support the first work roll in the front-rear direction, a first guide roll rotatably formed on the cassette body, contacting the first idler roll, and formed in front of or behind the first idler roll so as to support the first idler roll in the front-rear direction or in the circumferential direction of the drive roll, and a plurality of push roll units formed on a push bar installed on the front surface or the rear surface of the cassette body and arranged at regular intervals so as to support at least one of the first work roll, the first idler roll, and the first guide roll in the front-rear direction or in the circumferential direction of the drive roll.

Effects of the Invention

[0026] According to many embodiments of the present invention configured as described above, it is possible to firmly cope with the reaction force in the front-rear direction by using a cassette device that can support the first work roll in the front-rear direction, minimize the deformation of the first work roll in the front-rear direction, and actively cope with the deformation even when it occurs in the first work roll, so that alignment to a fixed position and restoration to the original state are possible. 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

Figure 2

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Figure 4

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Figure 6

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Figure 8

Figure 9

Figure 10

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Figure 12

Embodiments for Carrying Out the Invention

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

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

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

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

[0032] FIG. 1 is a perspective view showing an asymmetric rolling apparatus 100 according to some embodiments of the present invention.

[0033] First, as shown in FIG. 1, the asymmetric rolling apparatus 100 according to some embodiments of the present invention can generally include a first work roll WR1 (Work Roll), a second work roll WR2, a drive roll DR, a drive device 70, and a cassette device 80.

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

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

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

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

[0038] The improvement of the physical properties of such materials can vary depending on the type, thickness, specifications of the material to be rolled 1, and process environment such as 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, specifications of the material to be rolled 1, and process environment such as process temperature.

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

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

[0041] To give a more specific example, the drive device 70 can include a first actuator 71 including a motor or a power transmission device that drives the first work roll WR1, a second actuator 72 including a motor or a power transmission device that drives the second work roll WR2, and a drive control unit 73 that controls the first actuator 71 and the second actuator 72.

[0042] Although not shown in the drawings, various power transmission devices such as a combination of gears, a combination of belts and pulleys, a combination of chains and sprocket wheels, a combination of wire pulleys, and a combination of a movable table and a screw rod can be applied to the first actuator 71 and the second actuator 72 in addition to motors.

[0043] Further, for example, the cassette device 80 is a structure that contacts the first work roll WR1 and supports the first work roll WR1 in the front-rear direction. Such a cassette device 80 can not only support the first work roll WR1 in the front-rear direction, but also precisely adjust the reaction force for supporting by part and precisely control the form of the material to be rolled 1.

[0044] FIG. 2 is a perspective view showing the cassette device 80 of the asymmetric rolling device 100 in FIG. 1, FIG. 3 is a plan view showing the cassette device 80 of the asymmetric rolling device 100 in FIG. 2, FIG. 4 is a cross-sectional view showing the cassette device 80 of the asymmetric rolling device 100 in FIG. 3, FIG. 5 is a side cross-sectional view showing the asymmetric rolling device 100 in FIG. 1, and FIG. 6 is an enlarged side cross-sectional view showing the asymmetric rolling device 100 in FIG. 5.

[0045] To give a more specific example, as shown in FIGS. 1 to 6, the cassette device 80 is formed so as not to interfere with the linear movement path of the material to be rolled, and includes a cassette body 81 that rotatably supports the first work roll WR1, a first idler roll IR1 that is rotatably formed on the cassette body 81, contacts the first work roll WR1, and is formed in front of or behind the first work roll WR1 so as to support the first work roll WR1 in the front-rear direction, a first guide roll GR1 that is rotatably formed on the cassette body 81, contacts the first idler roll IR1, and is formed in front of or behind the first idler roll IR1 so as to support the first idler roll IR1 in the front-rear direction or in the circumferential direction of the drive roll DR, and a plurality of push roll units 90 that are formed on a push bar 82 installed on the front surface or the rear surface of the cassette body 81 and are arranged at regular intervals so as to support at least one of the first work roll WR1, the first idler roll IR1, and the first guide roll GR1 in the front-rear direction or in the circumferential direction of the drive roll DR.

[0046] Here, the cassette body 81 is a structure having sufficient strength and durability to withstand component loads and rolling loads, and can be an assembly formed by assembling various forms and numbers of vertical members, horizontal members, panel members, etc., or an integrally molded injection structure.

[0047] However, the shape and structure of such a cassette body 81 are not necessarily limited to the drawings, and all cassette frame structures in a very diverse form to withstand component loads and rolling loads can be applied.

[0048] Also, for example, the first idler roll IR1 includes a first - 1 idler roll IR1 - 1 formed in front of the first work roll WR1, with the second height H2 of the second central axis C2 formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1, and a first - 2 idler roll IR1 - 2 formed behind the first work roll WR1, with the third height H3 of the third central axis C3 formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1.

[0049] Also, for example, the first guide roll GR1 includes a first - 1 guide roll GR1 - 1 formed in front of the first work roll WR1, with the fourth height H4 of the fourth central axis C4 formed higher than the first height H1 of the first central axis C1 of the first work roll WR1, and a first - 2 guide roll GR1 - 2 formed behind the first work roll WR1, with the fifth height H5 of the fifth central axis C5 formed higher than the first height H1 of the first central axis C1 of the first work roll WR1.

[0050] Also, for example, the push roll unit 90 can include at least one push roll 93 that contacts at least one of the first work roll WR1, the first idler roll IR1, and the first guide roll GR1, a movable base 92 that rotatably supports the push roll 93, and a movable base forward - backward movement device installed on the push bar 82 that moves the movable base 92 forward and backward.

[0051] Here, the movable table forward / backward movement device can include an adjustment screw 91 rotatably formed on the push bar 82. However, it is not necessarily limited to this, and various forms of forward / backward movement devices capable of extension and contraction can all be applied.

[0052] That is, the movable table forward / backward movement device can include a driving device including at least one of a driving motor 94 that rotates the adjustment screw 91, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator, and a control unit 95 that applies a control signal to the driving device so that the pressing forces of the plurality of push rolls 93 become uniform.

[0053] Here, when pressing in the front-rear direction, two push rolls 83 can be installed on the upper and lower parts of the movable table 92 so that the movable table 92 can stably press the first guide roll GR1, and joints (not shown) and the like can be installed on the movable table 92 so that the pressing forces are evenly distributed to each of these push rolls 83.

[0054] Therefore, for example, when an operator manually operates and rotates the adjustment screw 91 of the plurality of push roll units 90, the movable table 92 can move forward by the adjustment screw 91. While the push roll 93 moves forward, a specific portion of the first guide roll GR1 is pressed in the front-rear direction, and specific portions of the first idler roll IR1 and the first work roll WR1 are also pressed, and the X-axis reaction force of the first work roll WR1 can be precisely adjusted so as to be overall uniform. Therefore, by precisely adjusting such an X-axis reaction force, the rolling load acting on the material to be rolled 1 can be precisely adjusted, and high-quality products can be produced.

[0055] On the one hand, as shown in FIG. 3, the push roll unit 90 may further include a drive motor 94 that rotates the adjusting screw 91, and a control unit 95 that applies a control signal to the drive motor 94 so that the pressing forces of the plurality of push rolls 93 are uniform.

[0056] Therefore, instead of the operator manually rotating the adjusting screw 91, it can be automatically rotated by the drive motor 94, and it is also possible to perform an automated rolling process using a sensor that measures the shape of the material to be rolled 1 and the control unit 95 optimized according to various specifications and rolling environments of the material to be rolled 1.

[0057] Here, the present invention is not limited only to the adjusting screw 91 and the drive motor 94 as described above. As described above, various hydraulic cylinders, pneumatic cylinders, electric actuators, etc. can all be applied.

[0058] Also, as shown in FIG. 6, the first actuator 71 and the second actuator 72 control the respective rotational angular velocities of the first work roll WR1 and the second work roll WR2, and the first rotational linear velocity V1 of the first work roll WR1 can be controlled to be the same as the second rotational linear velocity V2 of the second work roll WR2.

[0059] In addition to this, the drive device 70 is 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, the fourth radius R4 of the drive roll DR is the same as the second radius R2 of the second work roll WR2, and it is also possible to drive the drive roll DR and the second work roll WR2 in the same or opposite directions at the same rotational angular velocity.

[0060] Here, the meaning of "identical" should be understood as substantial identity that includes not only complete identity but also identity within the process margin due to inevitable errors inherent in the characteristics of the mechanical device, even though the operator controls the signal of the control unit with the intention of making the angular velocities of both rolls identical. Such "identity" of the rotational linear velocities of the first work roll WR1 and the second work roll WR2 can also be applied in the same sense hereinafter.

[0061] 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 identical for many purposes. For example, in order to provide a difference in shear deformation rate above and below the material to be rolled 1 or to control the warp of the material to be rolled 1, the first rotational linear velocity V1 and the second rotational linear velocity V2 may be controlled to have a slight difference, for example, within a range of 10%.

[0062] To give a more specific example, as shown in FIG. 6, for example, the first idle roll IR1 may be a kind of auxiliary rolling roll formed in front of or behind the first work roll WR1 so as to be in contact with the first work roll WR1 and support the first work roll WR1 in the front-rear direction.

[0063] Here, the first idle roll IR1 is formed at a distance of the first interval D1 from the drive roll DR and may be a rolling roll 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.

[0064] To give a more specific example, the first idle roll IR1 may include a first - 1 idle roll IR1 - 1 formed in front of the first work roll WR1, where the second height H2 of the second central axis C2 is formed to be the same as the first height H1 of the first central axis C1 of the first work roll WR1, and a first - 2 idle roll IR1 - 2 formed behind the first work roll WR1, where the third height H3 of the 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.

[0065] Therefore, the first - 1 idle roll IR1 - 1 and the 1 - 2 idle roll IR1 - 2 can support the first work roll WR1 to rotate more firmly in the front - rear direction, that is, not only in front of the first work roll WR1 but also in the front - rear direction, that is, behind the first work roll WR1.

[0066] Also, for example, the first guide roll GR1 may be a kind of auxiliary rolling roll formed in front of or behind the first idle roll IR1 so as to be in contact with the first idle roll IR1 and support the first idle roll IR1 in the front - rear direction or in the circumferential direction of the drive roll DR.

[0067] Such a first guide roll GR1 may be a rolling roll that has a fifth radius R5 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, is in contact with the drive roll DR for a more firm rotational support force, and does not interfere with the rolling path of the material to be rolled 1.

[0068] To give a more specific example, the first guide roll GR1 may include a first - 1 guide roll GR1 - 1 formed in front of the first work roll WR1, where the fourth height H4 of the fourth central axis C4 is formed higher than the first height H1 of the first central axis C1 of the first work roll WR1, and a first - 2 guide roll GR1 - 2 formed behind the first work roll WR1, where the fifth height H5 of the fifth central axis C5 is formed higher than the first height H1 of the first central axis C1 of the first work roll WR1.

[0069] Therefore, the first - 1 guide roll GR1 - 1 and the 1 - 2 guide roll GR1 - 2 can support the first work roll WR1 more firmly and rotatably in the front - rear direction, that is, not only in front of the first work roll WR1 but also behind the first work roll WR1, up to the first work roll WR1 and the first idler roll IR1.

[0070] Therefore, according to the present invention, the first work roll WR1 can be supported in a triangular arrangement so as to be in contact with each other by using the first idler roll IR1, the first guide roll GR1, and the push - roll unit 90 of the cassette device 80 that can support the first work roll WR1 in the front - rear direction. Thus, it can firmly cope with the reaction force in the front - rear direction, minimize the deformation of the first work roll WR1 in the front - rear direction, increase the strength and durability of the components through this, prevent defective phenomena, and precisely control the shape of the produced sheet material.

[0071] FIG. 7 is a cross - sectional view showing the first work roll WR1 of the asymmetric rolling device 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 device 100 of FIG. 7.

[0072] As shown in FIGS. 1 to 8, the first work roll WR1 of the asymmetric rolling device 100 according to many embodiments of the present invention includes a rolling part 10 that contacts the material to be rolled 1 so as to roll the material to be rolled 1, and a joint part 20 formed on the rolling part 10 so that the rolling part 10 can perform articulating movement in the front-rear direction, and a sliding part 30 formed on the rolling part 10 so that the rolling part 10 can slide in the axial direction while rotating.

[0073] For example, the rolling part 10 of the first work roll WR1 may be a portion that is generally cylindrically formed and contacts the first surface 1a of the material to be rolled 1.

[0074] Also, for example, as shown in FIG. 7, the joint part 20 of the first work roll WR1 is formed between the rolling part 10 and the sliding part 30, and as shown in FIG. 7, at least one of the joint balls 21, angular contact bearings 22, and combinations thereof installed in a shaft hole part 10a formed in a concave shape at the end of the rolling part 10 so that the rolling part 10 can perform articulating movement may be selected and configured.

[0075] Here, as shown in the enlarged right side portion of FIG. 8, a steel ball bearing inserted into the shaft hole part 10 may be applied to the joint ball 21. For the angular contact bearing 22, an inner ring 221 in a form where one side protrudes, an outer ring 222 in a form where the other side protrudes, and an angular contact ball bearing or an angular contact roller bearing composed of each ball 223 and each roller installed therebetween that can withstand a thrust load may be applied.

[0076] However, such joint balls 21 and angular contact bearings 22 are not necessarily limited to the drawings, and a very diverse form of bearing that can rotate and at the same time withstand all of the rolling load and the thrust load may be applied.

[0077] Also, for example, as shown in FIG. 8, the sliding portion 30 of the first work roll WR1 includes a sleeve 31 that is loosely inserted into the shaft hole portion 10a of the rolling portion 10, a sleeve rotating shaft 32 that is rotatably installed on the sleeve 31, a guide bush 33 that is fixed to the cassette body 81 or is rotatably formed and supports the sleeve rotating shaft 32 so as to be rotatable and slidable, and a damping device 34 that is installed on the sleeve rotating shaft 32 and enables the original state restoration of the sliding position of the sleeve rotating shaft 32 at no load while alleviating vibration and noise.

[0078] More specifically, the damping device 34 may include a compression spring 35 that is installed on one side of the sleeve rotating shaft 32 and on which an elastic restoring force acts during contraction, and a tension spring 36 that is installed on the other side of the sleeve rotating shaft 32 and on which an elastic restoring force acts during extension.

[0079] Therefore, the sleeve 31 is rotatably installed independently of the rolling portion 10, and the sleeve rotating shaft 32 is rotatable and slidable with reference to the guide bush 33. Thus, together with the articulation movement of the joint portion 20 described above, sliding rotation in the axial direction can be performed, and the original state restoration of the sliding position of the sleeve rotating shaft 32 at no load can be enabled by using the damping device 34.

[0080] Here, the sleeve 31, the sleeve rotating shaft 32, the guide bush 33, and the damping device 34 are respectively installed at the left and right ends of the rolling portion 10. When the rolling portion 10 is slid to the left, a restoring force acts in the right direction, and when the rolling portion 10 is slid to the right, a restoring force acts in the left direction, thereby enabling the original state restoration of the sliding position.

[0081] Therefore, such a damping device 34 can respond to the thrust load while acting as a damper that repeats contraction and extension, reduce the bearing load concentrated on the bearing, and prevent damage to the bearing.

[0082] In addition, 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 rotating shaft 32, and a thrust bearing 38 formed between the guide bush 33 and the bush cap BC.

[0083] More specifically, as shown in the enlarged intermediate portion of FIG. 8, the deep groove ball bearing 37 includes an inner ring 371 formed with grooves, an outer ring 372 formed with grooves, and balls 373 inserted between the respective grooves. When the rolling load is generated, the frictional force generated between the sleeve 31 and the sleeve rotating shaft 32 can be minimized.

[0084] Also, for example, as shown in the enlarged left side portion of FIG. 8, the thrust bearing 38 includes a fixed ring 381 installed on the bush cap BC, a rotating ring 382 installed on the guide bush 33 side, and balls 383 installed between them. When the rotating load is generated and rotates to the guide bush 33, the frictional force generated between the fixed bush cap BC and the guide bush 33 can be minimized.

[0085] However, such deep groove ball bearings 37 and thrust bearings 38 are not necessarily limited to the drawings, and various forms of bearings that can rotate and withstand all rolling loads and thrust loads can be applied.

[0086] Therefore, by using the joint portions 20 and the sliding portions 30 in various forms appropriately arranged for each part, all of the articulating motion, rotational motion, and axial sliding of the rolling portion 10 are possible. Through this, even when large deformation occurs in the first work roll WR1 due to a strong rolling load, it is possible to actively respond to this, enabling alignment to a fixed position and restoration to the original state. Through this, the strength and durability of the parts can be increased, defective phenomena can be prevented, and the shape of the produced plate material can be precisely controlled.

[0087] FIG. 9 is a cross-sectional view showing the first idler roll IR1 of the asymmetric rolling apparatus 100 of FIG. 1.

[0088] As shown in FIG. 9, the first idler roll IR1 of the asymmetric rolling apparatus 100 according to an embodiment of the present invention includes 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 the corner stress concentration phenomenon, a cap CP installed on the rotating shaft to fix the axial position and prevent bearing detachment, and a deep groove ball bearing 39 installed on the rotating shaft.

[0089] As shown in FIG. 9, three such deep groove ball bearings 39 are installed on the left side and four are installed on the right side due to the stress concentration phenomenon, and the number of installed bearings can vary from each other.

[0090] The deep groove ball bearing 39 in FIG. 9 enables the same configuration and role as the deep groove ball bearing 37 in FIG. 8, and a detailed description thereof will be omitted.

[0091] FIG. 10 is a cross-sectional view showing the 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 the rolling oil 2 is directly injected onto the first work roll WR1 through the rolling oil injection groove portion 41 of the asymmetric rolling apparatus 100 of FIG. 10.

[0092] As shown in FIGS. 10 and 11, the first guide roll GR1 of the asymmetric rolling apparatus 100 according to an embodiment of the present invention is formed with at least one rolling oil injection groove portion 41, a contact portion 40 that contacts the first idle roll IR1, and one end portion is fixed to the cassette body 81, and the other end portion is inserted into a concave portion 40a formed in a concave shape at the end portion of the contact portion 40. It can include a shaft portion 50 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.

[0093] Here, the self-aligning bearing 60 may be configured such that the inner ring is tiltable with respect to the outer ring, and balls or rollers are inclined and installed in a double layer so that they can be restored to their original positions when tilted.

[0094] However, such a self-aligning bearing 60 is not necessarily limited to this, and various forms of bearings that can rotate and can withstand all tilting loads can be applied.

[0095] For a more specific example, the rolling oil injection groove portion 41 may include a circumferential groove portion formed in a ring-shaped line groove along the circumference of the contact portion 40 so that the injected rolling oil 2 passes through the rolling oil injection groove portion 41 and is directly injected into the first work roll WR1 through a first interval D1 between the first idle roll IR1 and the drive roll DR.

[0096] Therefore, as shown in FIG. 11, the injected rolling oil 2 passes through the rolling oil injection groove portion 41, is directly injected into the first work roll WR1 through the first interval D1 between the first idle roll IR1 and the drive roll DR, and the rolling oil 2 can be smoothly supplied, thereby enhancing heat dissipation, reducing friction, and greatly improving rolling performance.

[0097] FIG. 12 is a cross-sectional view showing another example of the rolling oil injection groove portion 41 of the asymmetric rolling apparatus 100 of FIG. 1.

[0098] As shown in FIG. 12, the rolling oil injection groove portion 41 of the first guide roll GR1 can be formed in a spiral shape, a taper portion 42 for preventing corner stress concentration can be integrally formed on the contact portion 40, and a plurality of the self-aligning bearings 60 can be formed on the rotating shaft.

[0099] However, such self-aligning bearings 60 are not necessarily limited thereto, and bearings in various forms that can rotate and at the same time withstand all tilting loads can be applied.

[0100] Therefore, the material to be rolled 1 rolled by the asymmetric rolling device 100 of the present invention can include magnesium or a magnesium alloy having a hexagonal close-packed (HCP) structure. In recent years, magnesium, which has been studied as a next-generation lightweight member, has a density of 1.74 g / cm 3 and is lighter than iron having a density of 7.90 g / cm 3 and aluminum having a density of 2.7 g / cm 3 and can have very excellent specific strength and specific elastic modulus. In addition, it is excellent in absorption ability against vibration, impact, electromagnetic waves, etc., and excellent in electrical and thermal conductivity, so it can be applied not only to lightweight materials for automobiles, aircraft, etc., but also to the electronic industry fields such as mobile phones and notebook computers.

[0101] On the other hand, the material to be rolled 1 rolled by the asymmetric rolling device 100 of the present invention can also be rolled a plurality of times with the same material to be rolled 1. Performing rolling over such a plurality of times can be carried out in order to prevent problems that appear when an abrupt reduction amount is applied by sequentially applying a reduction amount adjusted to an appropriate level to the material to be rolled.

[0102] At this time, the multiple times mean that the rolled material 1 rolled by the work rolls WR1 and WR2 is re-fed into the same work rolls WR1 and WR2, or the work rolls WR1 and WR2 provided in plurality are passed through by the rolled material 1, so that the total number of rolling passes of the rolled material 1 is two or more. At this time, the process in which the rolled rolled material 1 is fed into the work rolls WR1 and WR2 can include all continuous and intermittent cases.

[0103] Also, the multiple times include not only the case where the rolled material 1 is re-fed after being physically separated from the work rolls WR1 and WR2, but also the case where the rolled material 1 is re-fed between the work rolls WR1 and WR2 when the rotational directions of the work rolls WR1 and WR2 are reversed while the rolled material 1 is still disposed between the work rolls WR1 and WR2.

[0104] Therefore, it is preferable that the first idler roll IR1 and the guide roll GR1 are disposed in front of and behind the first work roll WR1, respectively, with reference to the first work roll WR1 described above.

[0105] On the other hand, the rolled material 1 to be rolled by the asymmetric rolling apparatus 100 of the present invention is of course applicable to any material that controls the aggregate structure of the rolled material, in addition to the magnesium or magnesium alloy described above. For example, the rolled material 1 may be a metal material having a hexagonal close-packed crystal structure containing titanium (Ti) or a titanium alloy, a metal material containing aluminum and an aluminum alloy, or an Fe—Si alloy in which the crystal direction of the rolled material affects magnetic properties, and all of these cases can be applied.

[0106] On the other hand, the present invention may include a cassette device 80, and the configuration and role of such a cassette device 80 may be the same as the configuration and role of the asymmetric rolling device 100 described above. Therefore, a detailed description thereof will be omitted.

[0107] The present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those having ordinary knowledge in the relevant technical field will understand that various modifications and equivalent other embodiments will be possible hereafter. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims.

Claims

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

2. The cassette device includes a cassette body that rotatably supports the first work roll, and a first idler roll that is rotatably formed on the cassette body, contacts the first work roll, and is formed in front of or behind the first work roll so as to be able to support the first work roll in the front-rear direction, The asymmetric rolling device according to Claim 1, comprising the same.

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

4. The cassette device further includes a first guide roll that is rotatably formed on the cassette body, contacts the first idler roll, and is formed in front of or behind the first idler roll so as to be able to support the first idler roll in the front-rear direction or in a circumferential direction of the drive roll, The asymmetric rolling device according to Claim 2, comprising the same.

5. The first guide roll includes a first-1 guide roll that is formed in front of the first work roll and has a fourth height of a fourth central axis formed higher than a first height of a first central axis of the first work roll, and a first-2 guide roll that is formed behind the first work roll and has a fifth height of a fifth central axis formed higher than the first height of the first central axis of the first work roll, The asymmetric rolling device according to Claim 4, comprising the same.

6. The cassette device includes A plurality of push roll units formed on a push bar installed on the front or rear surface of the cassette body, and arranged at regular intervals so as to support at least one of the first work roll, the first idler roll, and the first guide roll in the front-rear direction or the circumferential direction of the drive roll. The asymmetric rolling device according to claim 4, further comprising the same.

7. The push roll unit includes: At least one push roll that contacts and rolls and rotates with at least one of the first work roll, the first idler roll, and the first guide roll; A movable table that rotatably supports the push roll; and A movable table forward and backward movement device installed on the push bar to move the movable table forward and backward. The asymmetric rolling device according to claim 6, further comprising the same.

8. The movable table forward and backward movement device includes: A drive device including at least one of a drive motor, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator; and A control unit that applies a control signal to the drive device so that the pressing forces of the plurality of push rolls become uniform. The asymmetric rolling device according to claim 7, further comprising the same.

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

10. The drive device is such that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll, the fourth radius of the drive roll is the same as the second radius of the second work roll, and the drive roll and the second work roll are driven at the same rotational angular velocity, according to claim 9 of the asymmetric rolling device.

11. The first work roll includes: A rolling part that contacts the material to be rolled so as to be able to roll the material to be rolled; A joint part formed on the rolling part so that the rolling part can perform articular movement in the front-rear direction; and A sliding part formed on the rolling part so that the rolling part can slide in the axial direction while rotating. The asymmetric rolling device according to claim 1, further comprising the same.

12. The joint part is: The asymmetric rolling device according to claim 11, wherein at least one or more of at least a spherical joint, an angular contact bearing, and a combination thereof installed in a shaft hole portion formed in a concave shape at an end portion of the rolling portion are selected and configured.

13. The sliding portion a sleeve loosely inserted into the shaft hole portion of the rolling portion, a sleeve rotating shaft rotatably installed on the sleeve, a guide bush fixed to the cassette body or rotatably formed, and supporting the sleeve rotating shaft to be rotatable and slidable, and a damping device installed on the sleeve rotating shaft, enabling the original state restoration of the sliding position of the sleeve rotating shaft during no load while alleviating vibration and noise, The asymmetric rolling device according to claim 12, including the above.

14. The damping device a compression spring installed on one side of the sleeve rotating shaft, with an elastic restoring force acting during contraction, and a tension spring installed on the other side of the sleeve rotating shaft, with an elastic restoring force acting during extension, The asymmetric rolling device according to claim 13, including the above.

15. The sliding portion at least one deep groove ball bearing formed between the sleeve and the sleeve rotating shaft, and a thrust bearing formed between the guide bush and the bush cap, The asymmetric rolling device according to claim 14, further including the above.

16. The first guide roll at least one or more rolling oil injection groove portions are formed, a contact portion contacting the first idle roll, a shaft portion with one end fixed to the cassette body and the other end inserted into a concave portion formed in a concave shape at the end of the contact portion, and at least one self-aligning bearing formed between the contact portion and the shaft portion so that the rotation centers of the contact portions are aligned and can rotate, The asymmetric rolling device according to claim 4, including the above.

17. The rolling oil injection groove portion includes a circumferential groove portion formed in a ring-shaped groove along the circumference of the contact portion so that the injected rolling oil can pass through the rolling oil injection groove portion and be directly injected into the first work roll through a first interval between the first idle roll and the drive roll. The asymmetric rolling device according to claim 16.

18. The cassette body, A first idler roll rotatably formed on the cassette body, contacting the first work roll, and formed in front of or behind the first work roll so as to support the first work roll in the front-rear direction; A first guide roll rotatably formed on the cassette body, contacting the first idler roll, and formed in front of or behind the first idler roll so as to support the first idler roll in the front-rear direction or in the circumferential direction of the drive roll; and A plurality of push roll units formed on a push bar installed on the front surface or the rear surface of the cassette body, and arranged at regular intervals so as to support at least one of the first work roll, the first idler roll, and the first guide roll in the front-rear direction or in the circumferential direction of the drive roll; A cassette device including the above.

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