Roll-molding device

Abstract

For a tapered material having a plate thickness changing in a longitudinal direction to be roll-molded with stability by means of a simple and inexpensive configuration, a roll-molding device includes two parallel roller shafts, fixed rollers concentrically disposed with respect to one of the roller shafts, floating rollers disposed to be capable of being eccentric with clearances with respect to the other one of the roller shafts, facing the fixed rollers, and molding a belt-shaped metallic material pinched between the fixed rollers and themselves, a pressing roller abutting against an outer circumferential portion on the side opposite to points of contact of the floating rollers with the fixed rollers, and actuators pressing the floating rollers toward the fixed rollers via the pressing roller.

1 . A roll-molding device comprising:
 two parallel roller shafts;   a fixed roller concentrically disposed with respect to one of the two roller shafts;   a floating roller disposed to be capable of being eccentric with a clearance with respect to the other one of the two roller shafts and facing the fixed roller;   a pressing roller abutting against an outer circumferential portion on the side opposite to a point of contact of the floating roller with the fixed roller; and   an actuator pressing the floating roller toward the fixed roller via the pressing roller.   
     
     
         2 . The roll-molding device according to  claim 1 ,
 wherein the pressing roller is disposed in a distributed manner at a plurality of symmetrical positions across an axial center connecting line, which connects axial center lines of the two roller shafts to each other, in axial view of the two roller shafts.   
     
     
         3 . The roll-molding device according to  claim 2 ,
 wherein the plurality of pressing rollers is pivotally supported by a common roller carrier and the actuator presses a position of intersection of the roller carrier with the axial center connecting line in the axial view of the two roller shafts.   
     
     
         4 . The roll-molding device according to  claim 1 , further comprising:
 a pair of guide rollers abutting against the outer circumferential portion of the floating roller and pivotally supported on both sides of the axial center connecting line across the axial center connecting line connecting the axial center lines of the two roller shafts to each other within a range between a pivotal support position of the roller shaft where the floating roller is disposed and a pivotal support position of the pressing roller.   
     
     
         5 . The roll-molding device according to  claim 1 ,
 wherein a constant force changing only a sectional shape of a metallic material pinched between the fixed roller and the floating roller without impairing a plate thickness of the metallic material is set as a pressing force of the actuator.   
     
     
         6 . The roll-molding device according to  claim 1 ,
 wherein a plurality of sets of the fixed rollers and a plurality of sets of the floating rollers are disposed,   wherein the fixed roller and the floating roller are disposed adjacent to each other in an axial direction at each of the two roller shafts,   wherein the fixed roller disposed at each one of the roller shafts faces the floating roller disposed at the other one of the roller shafts,   wherein a plurality of recessed portions for driving lining up in a circumferential direction is formed in an adjacent surface of one of the fixed roller and the floating roller adjacent to each other and pivotally supported by one of the roller shafts and a plurality of projecting portions for driving loosely fitted into the recessed portions for driving is formed on the other adjacent surface, and   wherein an eccentricity margin allowing the floating roller to be eccentric is provided between the recessed portion for driving and the projecting portion for driving.   
     
     
         7 . The roll-molding device according to  claim 1 ,
 wherein a roller width of at least one of the fixed roller and the floating roller can be changed.