Reversible guideless rolling mill

Abstract

A pair of rolling machines are arranged in series in alignment with a pass line along which a workpiece to be rolled is passed. The center distance between the first rolls of the first rolling machine and second rolls of the second rolling machine is designed to be not more than 1.5 times the roll diameter. The rotational axes of the first rolls are displaced by an angle of 90° from those of the second rolls and are inclined at an angle of 45° respectively with respect to the horizontal plane. A plurality of dual-purpose calibers are defined between the rolls of the rolling machines to be arranged in the axial direction, respectively. The rolls are shifted in crossing directions to the pass line respectively so as to bring desired dual-purpose calibers in alignment with the pass line.

What is claimed is:  
     
         1 . A reversible guideless rolling mill for rolling a workpiece to be rolled into a required cross-sectional profile while the workpiece is reciprocated along a pass line; 
 wherein two rolling machines each having a pair of rolls which defines a plurality of calibers in axial direction for rolling said workpiece are arranged in series along said pass line of the workpiece so as to establish a center distance between the rolls in one rolling machine and the rolls in the other rolling machine to be no more than 1.5 times a roll diameter;    rotational axes of the rolls in one rolling machine are displaced by almost right angle from that of the rolls in the other rolling machine; and    the rolls in said two rolling machines are designed to be shifted in crossing directions to the pass line of the workpiece so that each caliber is aligned with said pass line.    
     
     
         2 . The reversible guideless rolling mill according to  claim 1 , wherein the rotational axes of the rolls in the other rolling machine as standard are in designed to incline at an angle of 20° to 90° with respect to a horizontal plane.  
     
     
         3 . The reversible guideless rolling mill according to  claim 1  or  2 , wherein the calibers are designed to be able to serve both as oval calibers and round calibers by adjusting a clearance between the pair of rolls in each rolling machine.