Asymmetrical Rolling Device

The present disclosure relates to an asymmetric rolling device, and more specifically to an asymmetric rolling device capable of enhancing a physical property of materials.

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

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

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

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

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

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

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

In addition, according to the present disclosure, the first idle roll may be formed to be spaced apart from the drive roll by a first gap and having a third radius smaller than the first radius of the first work roll so as not to interfere with a rolling path of the material to be rolled.

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

In addition, according to the present disclosure, the driving device may drive each of the drive roll and the second work roll so that a first rotational linear velocity of the first work roll is the same as a second rotational linear velocity of the second work roll.

In addition, according to the present disclosure, the driving device may drive the drive roll and the second work roll at the same rotational angular velocity, and a fourth radius of the drive roll and the second radius of the second work roll may be the same to each other so that the first rotational linear velocity of the first work roll is the same as the second rotational linear velocity of the second work roll.

In addition, according to the present disclosure, the asymmetric rolling device may further include a first guide roll contacting the first idle roll and formed at a front or a back of the first idle roll so as to support the first idle roll in a longitudinal direction of the material or in a circumferential direction of the drive roll.

In addition, according to the present disclosure, the first guide roll may contact the drive roll and have a fifth radius greater than the first radius of the first work roll or greater than a third radius of the first idle roll so as not to interfere with a rolling path of the material to be rolled.

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

In addition, according to the present disclosure, the first guide roll may be formed to be spaced apart from the drive roll by a second gap.

In addition, according to the present disclosure, the asymmetric rolling device may further include a second idle roll contacting the first guide roll and formed at a front or a back of the first guide roll contacting the first guide roll so as to support the first guide roll in the longitudinal direction of the material or the circumferential direction of the drive roll.

In addition, according to the present disclosure, the asymmetric rolling device may further include a second guide roll contacting the second idle roll and formed at a front or a back of the second idle roll so as to support the second idle roll in the longitudinal direction of the material or the circumferential direction of the drive roll.

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

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

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

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

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

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

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

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

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

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

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

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

is a perspective view showing an asymmetric rolling deviceaccording to some embodiments of the present disclosure,is a cross-sectional view showing the asymmetric rolling deviceof, andis an enlarged cross-sectional view showing the asymmetric rolling deviceof.

First, as shown in, the asymmetric rolling deviceaccording to some embodiments of the present disclosure may broadly include a first work roll WR, a second work roll WR, a drive roll DR, a driving device, a first idle roll IR, and a first guide roll GR.

For example, the first work roll WRmay be a rolling roll contacting a first surface, that is, an upper surface of a material to be rolledhaving a panel shape.

The second work roll WRcorresponding to this may be a rolling roll contacting a second surface, that is, a lower surface of the material to be rolled, and may have a second radius Rgreater than a first radius Rof the first work roll WRso as to asymmetrically roll the material to be rolled.

In the drawing, the first work roll WRis positioned above the material to be rolled, and the second work roll WRis positioned below the material to be rolled, but it is not necessarily limited thereto, and the first work roll WRmay be positioned below the material to be rolled, and the second work roll WRmay be positioned above the material to be rolled. Alternatively, the first work roll WRmay be positioned at one side of the material to be rolled, and the second work roll WRmay be positioned at the other side of the material to be rolled.

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

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

Meanwhile, for example, the drive roll DR may be a kind of an auxiliary roll contacting the first work roll WRand formed above or below the first work roll WRso as to drive the first work roll WRand may be driven by the driving device.

In addition, for example, the driving devicemay be a device driving the second work roll WRand the drive roll DR, and may drive each of the drive roll DR and the second work roll WRso that a first rotational linear velocity Vof the first work roll WRis the same as a second rotational linear velocity Vof the second work roll WR.

More specifically, for example, the driving devicemay include a first actuatorincluding a motor for driving the first work roll WRor a power transmission device, a second actuatorincluding a motor for driving the second work roll WRor a power transmission device, and a drive control unitfor controlling the first actuatorand the second actuator.

Therefore, the first actuatorand the second actuatormay control a rotational angular velocity of each of the first work roll WRand the second work roll WRso that the first rotational linear velocity Vof the first work roll WRis the same as the second rotational linear velocity Vof the second work roll WR.

Alternatively, the driving devicemay drive the drive roll DR and the second work roll WRat the same rotational angular velocity in the same or opposite direction, and a fourth radius Rof the drive roll DR and the second radius Rof the second work roll WRmay be the same to each other so that the first rotational linear velocity Vof the first work roll WRis the same as the second rotational linear velocity Vof the second work roll WR.

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

However, in other embodiments of the present disclosure, the first rotational linear velocity Vof the first work roll WRand the second rotational linear velocity Vof the second work roll WRmay not be the same for various intentions. For example, the first rotational linear velocity Vand second rotational linear velocity Vmay be controlled to have a slight difference, for example, a difference within a range of 10%, in order to make a difference in shear deformation above and below the material to be rolledor to control the warpage of the material to be rolled.

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

In addition, for example, the first idle roll IRmay be a kind of an auxiliary rolling roll contacting the first work roll WRso as not to interfere with a linear movement path of the material to be rolledand formed at a front or a back the first work roll WRto support the first work roll WRin the longitudinal direction of the material.

Here, the first idle roll IRmay be a rolling roll formed to be spaced apart from the drive roll DR by a first gap Dand having a third radius Rsmaller than the first radius Rof the first work roll WRso as not to interfere with the rolling path of the material to be rolled.

More specifically, for example, the first idle roll IRmay include a 1-1 idle roll IR-formed at the front of the first work roll WR, and of which a second height Hof a second central axis Cis formed to be the same as a first height Hof a first central axis Cof the first work roll WR, and a 1-2 idle roll IR-formed at the back of the first work roll WR, and of which a third height Hof a third central axis Cis formed to be the same as the first height Hof the first central axis Cof the first work roll WR.

Therefore, the 1-1 idle roll IR-and the 1-2 idle roll IR-may support the first work roll WRto rotate more firmly not only in the longitudinal direction, that is, at the front of the first work roll WR, but also in the longitudinal direction, that is, at the back of the first work roll WR.

In addition, for example, the first guide roll GRmay be a kind of auxiliary rolling roll contacting the first idle roll IRand formed at a front or a back of the first idle roll IRso as to support the first idle roll IRin the longitudinal direction of the material or in a circumferential direction of the drive roll DR.