Asymmetrical rolling device

Abstract

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

What is claimed is: 
     
         1 . An asymmetric rolling device comprising:
 a first work roll contacting a first surface of a material to be rolled;   a second work roll contacting a second surface of the material to be rolled and having a second radius greater than a first radius of the first work roll so as to asymmetrically roll the material to be rolled;   a drive roll contacting the first work roll and formed above or below the first work roll so as to drive the first work roll;   a driving device driving the second work roll or the drive roll; 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.   
     
     
         2 . The asymmetric rolling device of  claim 1 , wherein the first idle roll is formed to be spaced apart from the drive roll by a first gap and has 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. 
     
     
         3 . The asymmetric rolling device of  claim 2 , wherein the first idle roll includes:
 a 1-1 idle roll formed at the front of the first work roll, and of which a second height of a second central axis is formed to be the same as a first height of a first central axis of the first work roll; 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.   
     
     
         4 . The asymmetric rolling device of  claim 1 , wherein the driving device drives each of the drive roll and the second work roll so that a first rotational linear velocity of the first work roll is the same as a second rotational linear velocity of the second work roll. 
     
     
         5 . The asymmetric rolling device of  claim 4 , wherein the driving device drives the drive roll and the second work roll at the same rotational angular velocity, and a fourth radius of the drive roll and the second radius of the second work roll are the same 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. 
     
     
         6 . The asymmetric rolling device of  claim 1 , further including 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. 
     
     
         7 . The asymmetric rolling device of  claim 6 , wherein the first guide roll contacts the drive roll and has 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. 
     
     
         8 . The asymmetric rolling device of  claim 7 , wherein the first guide roll includes:
 a 1-1 guide roll formed at the front of the first work roll, and of which a fourth height of a fourth central axis is formed to be greater than a first height of a first central axis of the first work roll; 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.   
     
     
         9 . The asymmetric rolling device of  claim 6 , wherein the first guide roll is formed to be spaced apart from the drive roll by a second gap. 
     
     
         10 . The asymmetric rolling device of  claim 6 , further including a second idle roll contacting the first guide roll and formed at a front or a back of 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. 
     
     
         11 . The asymmetric rolling device of  claim 10 , further including 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. 
     
     
         12 . The asymmetric rolling device of  claim 1 , wherein the first work roll includes:
 a rolling portion contacting the material to be rolled so as to roll the material to be rolled;   a joint portion formed in the rolling portion so that the rolling portion is joint-moved articulated in the longitudinal direction of the material; and   a sliding portion formed in the rolling portion so that the rolling portion slides in an axial direction while rotating.   
     
     
         13 . The asymmetric rolling device of  claim 12 , wherein the joint portion is formed by selecting at least one of a joint ball, an angular contact bearing, and combinations thereof, which is installed in a shaft hole portion concavely formed at an end portion of the rolling portion. 
     
     
         14 . The asymmetric rolling device of  claim 13 , wherein the sliding portion includes:
 a sleeve loosely inserted into the shaft hole portion of the rolling portion;   a sleeve rotation shaft installed on the sleeve so as to rotate freely;   a guide bush fixed to a cassette body or formed so as to rotate freely and supporting the sleeve rotation shaft so as to be rotatable and slidable; 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.   
     
     
         15 . The asymmetric rolling device of  claim 14 , wherein the damping device includes:
 a compression spring installed at one side of the sleeve rotation shaft and an elastic restoring force acts thereon during compression; and   an extension spring installed at the other side of the sleeve rotation shaft and an elastic restoring force acts thereon during expansion.   
     
     
         16 . The asymmetric rolling device of  claim 14 , wherein the sliding portion further includes:
 at least one deep groove ball bearing formed between the sleeve and the sleeve rotation shaft; and   a thrust bearing formed between the guide bush and a bush cap.   
     
     
         17 . The asymmetric rolling device of  claim 6 , wherein the first guide roll includes:
 a contact portion in which at least one rolling oil injecting groove portion is formed and contacting the first idle roll;   a shaft portion in which one end portion is fixed to a cassette body and the other end portion is inserted into a concave portion concavely formed at an end portion of the contact portion; 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.   
     
     
         18 . The asymmetric rolling device of  claim 17 , wherein the rolling oil injecting groove portion includes a circumferential linear groove portion formed in a ring-type linear groove shape along a circumference of the contact portion so that an injected rolling oil passes through the rolling oil injecting groove portion, passes a first gap between the first idle roll and the drive roll, and is directly injected into the first work roll.