JP7837597B2 - Asymmetrical rolling mill and cassette machine - Google Patents

Description

This invention relates to an asymmetric rolling mill and a cassette apparatus, and more particularly, to an asymmetric rolling mill and a cassette apparatus capable of improving the physical properties of materials.

Generally, a rolling process can be used to process metal components into sheet materials or other forms conforming to certain specifications. In such a rolling process, the microstructure within the rolled material can change in accordance with the change in its thickness.

In response to these changes in the microstructure of the rolled material, it first exhibits a texture in which crystals are oriented in the orientation direction. This texture, which appears after rolling, is very closely related to the material's properties, such as its formability.

Therefore, by controlling the texture of the rolled material during the rolling process, it is possible to improve the material's properties, such as its formability, after rolling.

Conventionally, in order to improve the physical properties of such materials, asymmetric rolling techniques have been developed that use at least one pair of work rolls with different radii, enabling effective shear deformation even in materials with poor room-temperature formability.

However, conventional asymmetric rolling techniques, as described above, have many problems. During the rolling process, a strong reaction force acts on the relatively small-radius work rolls in the longitudinal direction, i.e., in the direction of the rolling material's movement. This can easily deform the small-radius work rolls, potentially causing various defects in the rolling material, such as uneven wave formation, buckling, uneven thickness, distortion, or deflection to one side. Furthermore, the work rolls can deform excessively beyond their elastic range, leading to detachment from their position or even breakage.

The present invention aims to solve many problems, including those described above, by providing an asymmetric rolling mill and cassette device that can firmly withstand longitudinal reaction forces using a cassette device capable of supporting the first work roll in the longitudinal direction, and that can actively respond to deformation of the first work roll, thereby enabling alignment to a fixed position and restoration to its original state. However, the above-mentioned problems are illustrative and do not limit the scope of the present invention.

The asymmetric rolling apparatus according to the concept of the present invention for solving the aforementioned 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 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 cassette device that contacts the first work roll so as not to interfere with the linear movement path of the material to be rolled and supports the first work roll in the front-rear direction.

Furthermore, according to the present invention, the cassette device may 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.

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 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 the first central axis of the first work roll.

Furthermore, according to the present invention, the cassette device may further include a first guide roll, which 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.

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.

Furthermore, according to the present invention, the cassette device may further include a plurality of push-roll units formed on a push bar installed on the front or rear surface of the cassette body, arranged at regular intervals to support at least one of the first work roll, the first idle roll, and the first guide roll in the front-rear direction or in the circumferential direction of the drive roll.

Furthermore, according to the present invention, the push roll unit may include at least one push roll that contacts and rolls in contact with at least 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/backward device installed on the push bar that moves the movable base forward and backward.

Furthermore, according to the present invention, the movable platform forward/backward movement device includes a drive device comprising at least one of a drive motor, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator, and
The system may include a control unit that applies a control signal to the drive unit so that the pressing force of the multiple push rolls becomes uniform.

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.

Furthermore, according to the present invention, the drive device is configured 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, with the fourth radius of the drive roll being the same as the second radius of the second work roll, thereby enabling the drive roll and the second work roll to be driven at the same rotational angular velocity.

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; an articulated portion formed on the rolling portion so as to allow articulation of the rolling portion in the front-rear direction; and a sliding portion formed on the rolling portion so as to allow the rolling portion to slide axially while rotating.

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.

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 rotatably formed to support the sleeve rotating shaft so that it can rotate and slide, and a damping device installed on the sleeve rotating shaft that reduces vibration and noise while enabling the sleeve rotating shaft to return to its original sliding position when unloaded.

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.

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 axis, and a thrust bearing formed between the guide bush and the bush cap.

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 contacting the first idler roll, a shaft portion with 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 can be aligned and rotated.

Furthermore, 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 passes through the rolling oil injection groove portion and is directly injected onto the first work roll via the first gap between the first idler roll and the drive roll.

On the other hand, a cassette device according to the concept of the present invention for solving the above problems may include a cassette body, a first idler roll rotatably formed on the cassette body and in contact with 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 and in contact with 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 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 in the circumferential direction of the drive roll.

According to many embodiments of the present invention configured as described above, a cassette device capable of supporting the first work roll in the front-rear direction can be used to firmly respond to reaction forces in the front-rear direction, minimizing deformation of the first work roll in the front-rear direction. Even if deformation occurs in the first work roll, it is possible to actively respond to this deformation, enabling alignment to the correct position and restoration 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. Of course, the scope of the present invention is not limited by these effects.

This is a perspective view showing an asymmetric rolling mill according to some embodiments of the present invention. Figure 1 is a perspective view showing the cassette device of an asymmetric rolling mill. Figure 2 is a plan view showing the cassette device of an asymmetric rolling mill. Figure 3 is a cross-sectional view showing the cassette device of an asymmetric rolling mill. Figure 1 is a side cross-sectional view showing an asymmetric rolling mill. Figure 5 is an enlarged side cross-sectional view showing an asymmetric rolling mill. Figure 1 is a cross-sectional view showing the first work roll of an asymmetric rolling mill. Figure 7 is an enlarged cross-sectional view showing a portion of the first work roll of an asymmetric rolling mill. Figure 1 is a cross-sectional view showing the first idler roll of an asymmetric rolling mill. Figure 1 is a cross-sectional view showing the first guide roll of an asymmetric rolling mill. Figure 10 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 1 is a cross-sectional view showing another example of the rolling oil injection groove section of an asymmetric rolling mill.

Several preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

Each embodiment of the present invention is provided to further and completely illustrate the invention to those skilled in the art, and the following embodiments can be modified into many other forms; the scope of the invention is not limited to these embodiments. Rather, these embodiments are provided to further enrich and complete this disclosure and to fully convey the idea of the invention to those skilled in the art. Furthermore, the thicknesses and sizes of the layers in the drawings are exaggerated for illustrative purposes and clarity.

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 may include multiple forms unless the context explicitly indicates otherwise. Furthermore, as used herein, “comprise” and/or “comprising” specify 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.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings schematically illustrating ideal embodiments of the present invention. In each drawing, variations in 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 within the region shown herein, and should include, for example, changes in shape resulting from manufacturing.

Figure 1 is a perspective view showing an asymmetric rolling mill 100 according to some embodiments of the present invention.

First, as shown in Figure 1, 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, and a cassette unit 80.

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.

The corresponding second work roll WR2 may be a rolling roll having a second radius R2 that is larger than the first radius R1 of the first work roll WR1, so asymmetric rolling of the material to be rolled 1 is possible, by contacting the second surface 1b, i.e., the lower surface, of the material to be rolled 1.

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, this is not necessarily 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.

Therefore, the rolled material 1 can be rolled thinly from a first thickness T to a second thickness t while passing between the first work roll WR1 and the second work roll WR2. In this process, since the radii of the two rolling rolls that roll the material 1 are different, the shear deformation forces acting on the material 1 act in different ways, resulting in a denser material structure and potentially superior material properties.

The improvement in the physical properties of such materials can 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 these factors.

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.

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.

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.

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, belts and pulleys, chains and sprocket wheels, wire pulleys, and combinations of movable bases and threaded rods.

Furthermore, 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 not only supports the first work roll WR1 in the front-rear direction, but also precisely adjusts the force of the reaction force supporting each part, thereby precisely controlling the shape of the rolled material 1.

Figure 2 is a perspective view showing the cassette device 80 of the asymmetric rolling mill 100 in Figure 1; Figure 3 is a plan view showing the cassette device 80 of the asymmetric rolling mill 100 in Figure 2; Figure 4 is a cross-sectional view showing the cassette device 80 of the asymmetric rolling mill 100 in Figure 3; Figure 5 is a side cross-sectional view showing the asymmetric rolling mill 100 in Figure 1; and Figure 6 is an enlarged side cross-sectional view showing the asymmetric rolling mill 100 in Figure 5.

To give a more specific example, as shown in Figures 1 to 6, the cassette device 80 is formed so as not to interfere with the linear movement path of the rolled material, and includes a cassette body 81 that rotatably supports the first work roll WR1, a first idler roll IR1 formed rotatably on the cassette body 81 and in contact with the first work roll WR1, and 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, and a rotatably formed on the cassette body 81 and in contact with the first idler roll IR1 The system may include a first guide roll GR1 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 formed on a push bar 82 installed on the front or rear surface of the cassette body 81, and 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.

Here, the cassette body 81 is a structure having sufficient strength and durability to withstand component loads and rolling loads, and may be an assembly composed of various shapes and numbers of vertical members, horizontal members, panel members, etc., or it may be a single-piece injection-molded structure.

However, the shape and structure of the aforementioned cassette body 81 are not necessarily limited to those shown in the drawings; a wide variety of cassette frame structures capable of withstanding component loads and rolling loads can all be applied.

Furthermore, for example, the first idler roll IR1 may include a first-first idler roll IR1-1 formed in front of the first work roll WR1, with the second height H2 of the second central axis C2 being the same as the first height H1 of the first central axis C1 of the first work roll WR1, and a first-second idler roll IR1-2 formed behind the first work roll WR1, with the third height H3 of the third central axis C3 being the same as the first height H1 of the first central axis C1 of the first work roll WR1.

Furthermore, for example, the first guide roll GR1 may include a first-first 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 higher than the first height H1 of the first central axis C1 of the first work roll WR1, and a first-second guide roll GR1-2 formed behind the first work roll WR1, where the fifth height H5 of the fifth central axis C5 is higher than the first height H1 of the first central axis C1 of the first work roll WR1.

Furthermore, for example, the push roll unit 90 may include at least one push roll 93 that contacts at least one of the first work roll WR1, the first idle 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 device installed on the push bar 82 that moves the movable base 92 forward and backward.

Here, the movable platform forward/backward movement device may 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.

In other words, the movable platform forward/backward movement device may include a drive unit comprising at least one of the following: a drive motor 94 for rotating the adjustment screw 91, a hydraulic cylinder, a pneumatic cylinder, and an electric actuator; and a control unit 95 for applying control signals to the drive unit so that the pressure applied to the plurality of push rolls 93 becomes uniform.

Here, when applying pressure in the front-rear direction, the movable base 92 may be equipped with two push rolls 83 at its upper and lower sections so that the movable base 92 can stably apply pressure to the first guide roll GR1. The movable base 92 may be equipped with joints (not shown) or the like so that the pressurizing force can be evenly distributed to each of these push rolls 83.

Therefore, for example, when an operator manually rotates the adjustment screws 91 of the multiple push-roll units 90, the movable base 92 can be advanced by the adjustment screws 91. As the push-roll 93 advances, a specific portion of the first guide roll GR1 is pressurized in the front-rear direction, and specific portions of the first idle roll IR1 and the first work roll WR1 are also pressurized. This allows for precise adjustment so that the X-axis reaction force of the first work roll WR1 is uniform throughout. Therefore, by precisely adjusting this X-axis reaction force, the rolling load acting on the rolled material 1 can be precisely adjusted, enabling the production of high-quality products.

On the other hand, as shown in Figure 3, the push roll unit 90 may further include a drive motor 94 for rotating the adjustment screw 91, and a control unit 95 for applying a control signal to the drive motor 94 so that the pressing force of the multiple push rolls 93 becomes uniform.

Therefore, instead of the operator manually rotating the adjustment screw 91, it can be automatically rotated by the drive motor 94. Furthermore, an automated rolling process can be performed using a sensor that measures the shape of the rolled material 1, and a control unit 95 that is programmed to optimize the rolling process according to the diverse specifications of the rolled material 1 and the rolling environment.

Herein, the present invention is not limited to the adjustment screw 91 and drive motor 94 described above, but as stated above, various hydraulic cylinders, pneumatic cylinders, electric actuators, etc., can all be applied.

Furthermore, as shown in Figure 6, 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 becomes the same as the second rotational linear velocity V2 of the second work roll WR2.

In addition to the above, the drive unit 70 can also be configured 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, thereby driving the drive roll DR and the second work roll WR2 in the same or opposite directions at the same rotational angular velocity.

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 when the operator intentionally controls the control signal to make 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.

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%.

To give a more specific example, as shown in Figure 6, for instance, 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 and support the first work roll WR1 in the front-rear direction.

Here, the first idler 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 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.

To give a more specific example, the first idler roll IR1 may include a first-first idler roll IR1-1 formed in front of the first work roll WR1, where 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 first-second idler roll IR1-2 formed behind the first work roll WR1, where 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.

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.

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 longitudinal direction or in the circumferential direction of the drive roll DR.

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 idler roll IR1, so as not to interfere with the rolling path of the rolled material 1, and to provide a more robust rotational support force by contacting the drive roll DR.

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, where the fourth height H4 of the fourth central axis C4 is 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, where the fifth height H5 of the fifth central axis C5 is higher than the first height H1 of the first central axis C1 of the first work roll WR1.

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, not only in front of the first work roll WR1, but also in the rear-rear direction, that is, up to the first work roll WR1 and the first idler roll IR1.

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, the first guide roll GR1, and the push roll unit 90 of the cassette device 80, which can support the first work roll WR1 in the front-rear direction. This allows for robust 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 component, prevents defects, and allows for precise control of the shape of the produced sheet material.

Figure 7 is a cross-sectional view showing the first work roll WR1 of the asymmetric rolling mill 100 shown in Figure 1, and Figure 8 is an enlarged cross-sectional view showing a portion of the first work roll WR1 of the asymmetric rolling mill 100 shown in Figure 7.

As shown in Figures 1 to 8, the first work roll WR1 of the asymmetric rolling mill 100 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 allow the rolling section 10 to move in the forward and backward directions, and a sliding section 30 formed on the rolling section 10 so as to allow the rolling section 10 to slide axially while rotating.

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 contacts the first surface 1a of the rolled material 1.

Furthermore, for example, as shown in Figure 7, the joint portion 20 of the first work roll WR1 is formed between the rolling portion 10 and the sliding portion 30. As shown in Figure 7, it can be configured by selecting at least one of the following: a joint ball 21, an angular contact bearing 22, or a combination thereof, which is installed in a concave shaft hole portion 10a formed at the end of the rolling portion 10 to enable joint movement of the rolling portion 10.

Here, as shown in the enlarged right portion of Figure 8, 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 consist of an inner ring 221 with one side protruding to withstand thrust loads, an outer ring 222 with the other side protruding, and balls 223 or rollers placed between them, such as an angular contact ball bearing or an angular contact roller bearing.

However, the joint ball 21 and angular contact bearing 22 are not necessarily limited to those shown in the drawings. A wide variety of bearing configurations are possible that are rotatable and capable of withstanding both rolling and thrust loads.

Furthermore, as shown in Figure 8, 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 or rotatably formed on the cassette body 81 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 while enabling the sleeve rotating shaft 32 to return to its original sliding position when unloaded.

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 provides an elastic restoring force when compressed, and a tension spring 36 installed on the other side of the sleeve rotation shaft 32, which provides an elastic restoring force when extended.

Therefore, since the sleeve 31 is rotatably installed independently of the rolling section 10, and the sleeve rotation shaft 32 can rotate and slide relative to the guide bush 33, it can perform axial sliding rotation along with the joint movement of the joint section 20 described above, and the damping device 34 allows the sleeve rotation shaft 32 to return to its original sliding position when unloaded.

Here, the sleeve 31, sleeve rotating shaft 32, guide bush 33, and 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 to the right, and when the rolling section 10 slides to the right, a restoring force acts to the left, thereby enabling the sliding position to be restored to its original state.

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.

In addition to the above, as shown in Figure 8, the sliding portion 30 of the first work roll WR1 may further include at least one deep groove ball bearing 37 formed between the sleeve 31 and the sleeve rotation shaft 32, and a thrust bearing 38 formed between the guide bush 33 and the bush cap BC.

To give a more specific example, as shown in the enlarged intermediate section of Figure 8, the deep groove ball bearing 37 is a bearing consisting of an inner ring 371 with grooves, an outer ring 372 with grooves, and balls 373 inserted between the grooves. This bearing minimizes the frictional force generated between the sleeve 31 and the sleeve rotation shaft 32 when a rolling load is applied.

Furthermore, as shown in the enlarged left portion of Figure 8, 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.

However, the deep groove ball bearing 37 and thrust bearing 38 described above are not necessarily limited to those shown in the drawings. A wide variety of bearing configurations that are rotatable and capable of withstanding both rolling and thrust loads can be applied.

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 significant deformation occurs in the first work roll WR1 due to a strong rolling load, it is possible to actively respond to this deformation, enabling alignment to the correct position and restoration to the original state. This increases the strength and durability of the parts, prevents defects, and allows for precise control of the shape of the produced sheet material.

Figure 9 is a cross-sectional view showing the first idler roll IR1 of the asymmetric rolling mill 100 shown in Figure 1.

As shown in Figure 9, the first idler roll IR1 of the asymmetric rolling mill 100 according to one embodiment 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 mitigate corner stress concentration phenomena, a cap CP installed on the rotating shaft to fix the shaft position and prevent bearing detachment, and a deep groove ball bearing 39 installed on the rotating shaft.

As shown in Figure 9, these deep groove ball bearings 39 are installed in such configurations as three on the left side and four on the right side due to stress concentration phenomena, and the number of bearings installed can vary between the two sides.

The deep groove ball bearing 39 in Figure 9 has the same configuration and function as the deep groove ball bearing 37 in Figure 8, and a detailed explanation of it is omitted.

Figure 10 is a cross-sectional view showing the first guide roll GR1 of the asymmetric rolling mill 100 shown in Figure 1, and Figure 11 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 shown in Figure 10.

As shown in Figures 10 and 11, the first guide roll GR1 of the asymmetric rolling mill 100 according to one embodiment of the present invention may include a contact portion 40 having at least one rolling oil injection groove 41 that contacts 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.

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 with inclination to allow for return to the original position during tilting.

However, the aforementioned self-aligning bearing 60 is not necessarily limited to this; a wide variety of bearings that are both rotatable and capable of withstanding all tilting loads can be applied.

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

Therefore, as shown in Figure 11, the injected rolling oil 2 passes through the rolling oil injection groove 41 and is directly injected into the first work roll WR1 via the first gap D1 between the first idler roll IR1 and the drive roll DR. This allows for smooth supply of the rolling oil 2, thereby improving heat dissipation, reducing friction, and significantly improving rolling performance.

Figure 12 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.

As shown in Figure 12, 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 on the contact portion 40, and multiple self-aligning bearings 60 may be formed on the rotating shaft.

However, the aforementioned self-aligning bearing 60 is not necessarily limited to this; a wide variety of bearings that are both rotatable and capable of withstanding all tilting loads can be applied.

Therefore, the rolled material 1 rolled by the asymmetric rolling apparatus 100 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. It has a density of 1.74 g/ ^cm³ , which is lighter than iron, which has a density of 7.90 g/ ^cm³ , and aluminum, which has a density of 2.7 g/ ^cm³ . It also has 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 portable telephones and notebook computers.

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

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 into the work rolls WR1 and WR2 can include both continuous and intermittent cases.

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

Therefore, it is preferable that the first idler roll IR1 and the guide roll GR1 be positioned in front of and behind the first work roll WR1, respectively.

On the other hand, the rolled material 1, which is rolled by the asymmetric rolling apparatus 100 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, it can be applied to any case where 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 where the crystal orientation of the rolled material affects its magnetic properties.

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 mill 100 described above. Therefore, a detailed explanation thereof will be omitted.

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 (15)

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 cassette device that contacts the first work roll so as not to interfere with the linear movement path of the rolled material and supports the first work roll in the front-rear direction,
Includes,
The aforementioned cassette device,
A cassette body that rotatably supports the first work roll,
A first idler roll is formed rotatably 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,
A first guide roll is formed rotatably 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,
A plurality of push roll units are formed on a push bar installed on the front or rear surface of the cassette body and are arranged at regular intervals so as to support at least one of the first work roll, the first idle roll, and the first guide roll in the front-rear direction or in the circumferential direction of the drive roll,
An asymmetric rolling mill, including one . The first idle roll is,
A first-first idler roll formed in front of the first work roll, the second height of the second central axis being the same as the first height of 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 the third central axis being the same as the first height of the first central axis of the first work roll,
The asymmetric rolling apparatus according to claim 1 , including the following: The first guide roll is,
A first-first guide roll formed in front of the first work roll, wherein 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-second guide roll formed behind the first work roll, wherein 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 1 , including the following: The aforementioned push roll unit is
At least one push roll that is in contact with at least one of the first work roll, the first idle roll, and the first guide roll, and rotates by rolling,
A movable base that rotatably supports the push roll, and a movable base forward/backward movement device installed on the push bar that moves the movable base forward and backward,
The asymmetric rolling apparatus according to claim 1 , including the following: The aforementioned movable platform forward/backward movement device is
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 pressurizing force of the plurality of push rolls is uniform.
The asymmetric rolling apparatus according to claim 4 , including the following: 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. The asymmetric rolling apparatus according to claim 6, 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. 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 formed in the rolling mill so as to enable joint movement of the rolling mill in the front-rear direction, and a sliding portion formed in the rolling mill so as to enable the rolling mill to slide axially while rotating,
The asymmetric rolling apparatus according to claim 1, including the following: The aforementioned joint portion is
The asymmetric rolling apparatus according to claim 8 , wherein at least one or more of the following are selected and installed in the axial hole portion formed in a concave shape at the end of the rolling portion: articulated balls, angular contact bearings, and combinations thereof. The aforementioned sliding part is,
A sleeve loosely inserted into the shaft hole of the rolling section,
A sleeve rotation shaft is rotatably mounted on the aforementioned sleeve,
A guide bush fixed to the cassette body or rotatably formed to support the sleeve rotation shaft so that it can rotate and slide; and a damping device installed on the sleeve rotation shaft that reduces vibration and noise and allows the sleeve rotation shaft to return to its original sliding position when unloaded.
The asymmetric rolling apparatus according to claim 9 , including the following: 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 10 , including the following: The aforementioned sliding part is,
A 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,
The asymmetric rolling apparatus according to claim 11 , further comprising: 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 at least one self-aligning bearing formed between the contact portion and the shaft portion so that the rotation centers of the contact portion can be aligned and rotated,
The asymmetric rolling apparatus according to claim 1 , including the following: The asymmetric rolling apparatus according to claim 13, 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 after passing through a first gap between the first idler roll and the drive roll . The cassette body and,
A first idler roll is formed rotatably 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,
A first guide roll formed rotatably on the cassette body, in contact with 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 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 in the circumferential direction of the drive roll.
A cassette player, including a cassette player.