Dieless sheet forming apparatus with flexible rollers

Abstract

Disclosed is a dieless sheet forming device including: two forming rollers rotatably disposed up and down to correspond with each other and bent to various curvatures; and a plurality of roller adjustment members whose one ends are fixed to each forming roller in such a manner as to be adjusted in length to adjust the curvatures of the forming rollers and the distances between the two forming rollers, wherein the curvatures of the forming rollers and the distances between the forming rollers through which a sheet to be formed is passed are adjusted to change the forming shape of the sheet. According to the present invention, the forming shapes of the sheet can be easily corrected if the desired shape is changed, so that the sheet forming device can be applied for small quantity batch production, does not generate dimples or wrinkles, can form even the edge portions of the sheet, and can form the sheet without having the limitation on the thickness or size of the sheet.

1 . A dieless sheet forming device comprising:
 two forming rollers rotatably disposed up and down to correspond with each other and bent to various curvatures; and   a plurality of roller adjustment members whose one ends are fixed to each forming roller in such a manner as to be adjusted in length to adjust the curvatures of the forming rollers and the distances between the two forming rollers,   
       wherein the curvatures of the forming rollers and the distances between the forming rollers through which a sheet to be formed is passed are adjusted by means of the roller adjustment members to change the forming shape of the sheet. 
     
     
         2 . The dieless sheet forming device according to  claim 1 , wherein each roller adjustment member comprises an external member having an internal screw thread and an internal member having an external screw thread and is adjusted in length in accordance with the screw-coupled length between the external member and the internal member. 
     
     
         3 . The dieless sheet forming device according to  claim 2 , wherein the external member is fixed to one of the forming rollers, and the internal member is connected to the motor, so that the length of each roller adjustment member is adjusted through the rotation of the motor. 
     
     
         4 . The dieless sheet forming device according to  claim 2 , wherein the external member is fixed to one of the forming rollers, and each roller adjustment member has a roller guide disposed rotatably at the end of the external member fixed to the forming roller, the roller guide having a recess of a major arc shape, into which the forming roller is fittedly inserted. 
     
     
         5 . The dieless sheet forming device according to  claim 1 , wherein the sheet to be formed is inserted between the two forming rollers and pulled so as to be passed through between the forming rollers, thus completing the forming of the sheet. 
     
     
         6 . The dieless sheet forming device according to  claim 1 , wherein one or both forming rollers are connected at both ends thereof to roller rotation motors, so that the sheet engaged with the forming rollers is pushed and formed through the rotation of the roller rotation motors. 
     
     
         7 . The dieless sheet forming device according to  claim 1 , wherein each forming roller is wound by steel wires on the outer peripheral surface. 
     
     
         8 . The dieless sheet forming device according to  claim 7 , wherein the steel wire wound on an outmost surface of each forming roller contacted with the sheet becomes flat through grinding. 
     
     
         9 . The dieless sheet forming device according to  claim 7 , wherein the steel wire wound on an outmost surface of each forming roller contacted with the sheet has an oval section.