Transportable compact correction device in particular for polishing calendering cylinders

Abstract

A corrective grinding device for machining a surface to be ground ( 2 A) of a part of revolution ( 2 ) with a main central axis (X 2 ), comprises a base ( 5 ) to be fixed on the frame ( 3 ), a machining head ( 10 ) comprising an abrasive belt ( 11 ) which is guided along a belt path ( 12 ) so as to be pressed against the surface to be ground ( 2 A) in a first penetration direction (Y 10 ), a belt-driving motor ( 16 ) arranged to drive the abrasive belt ( 11 ) in motion along the belt path ( 12 ), a head movement system ( 23 ) for moving the machining head ( 10 ) on the base ( 5 ) in a second feed direction (X 10 ) along the main central axis (X 2 ). In orthogonal projection in a base plane (P 10 ) defined by the feed direction (X 10 ) and the penetration direction (Y 10 ), the projected surface of the abrasive belt ( 11 ) overlaps the projected surface of the stator ( 17 ) of the belt-driving motor ( 16 ).

1 - 13 . (canceled) 
     
     
         14 . A corrective grinding device ( 1 ) intended to machine, by abrasion, a surface to be ground ( 2 A) of a part of revolution ( 2 ) which has a main central axis (X 2 ) and which is mounted with the ability to rotate on a frame ( 3 ) about the main central axis (X 2 ), the device comprising:
 a base ( 5 ) which is provided with coupling members ( 6 ,  7 ,  8 ) making it possible to fix the base ( 5 ) on the frame ( 3 );   a machining head ( 10 ) which comprises an abrasive belt ( 11 ) which is guided along a belt path ( 12 ) defined by a plurality of wheels ( 13 ,  14 ,  15 ) carried by the machining head ( 10 ), the plurality of wheels including an applicator wheel ( 13 ) intended to press the abrasive belt ( 11 ) against the surface to be ground ( 2 A) in a penetration direction (Y 10 ) which is transverse to the main central axis (X 2 ), the machining head ( 10 ) also comprising a belt-driving motor ( 16 ) of which a stator ( 17 ) is fixed to the machining head ( 10 ) and which is arranged to drive the abrasive belt ( 11 ) in motion along the belt path ( 12 ); and   a head movement system ( 23 ) which makes it possible to move the machining head ( 10 ) on the base ( 5 ) in a feed direction (X 10 ) which is transverse to the penetration direction (Y 10 ), so that the machining head ( 10 ) can, along the main central axis (X 2 ), cover a useful feed stroke (L 10 ),   wherein, in orthogonal projection in a base plane (P 10 ) defined by the feed direction (X 10 ) and the penetration direction (Y 10 ), a projected surface of the abrasive belt ( 11 ) which is in the belt path ( 12 ) overlaps a projected surface of the stator ( 17 ) of the belt-driving motor ( 16 ).   
     
     
         15 . The corrective grinding device according to  claim 14 , wherein the abrasive belt ( 11 ) is closed on itself so as to form a continuous loop which travels in a closed circuit along the belt path ( 12 ), around the stator ( 17 ) of the belt-driving motor ( 16 ), so that, in projection in a plane normal to the feed direction (X 10 ), the stator ( 17 ) of the belt-driving motor ( 16 ) is strictly contained within a perimeter delimited by the abrasive belt ( 11 ). 
     
     
         16 . The corrective grinding device according to  claim 14 , wherein the belt-driving motor ( 16 ) comprises a rotor which is mounted with the ability to rotate relative to the stator ( 17 ) along a drive motor axis (Y 16 ) so that interaction between the stator ( 17 ) and the rotor which is created within the belt-driving motor ( 16 ) during an activation of the belt-driving motor ( 16 ) generates a torque which causes the rotor to rotate on itself relative to the stator ( 17 ) around the drive motor axis (Y 16 ),
 wherein the rotor is coupled to at least one ( 13 ) drive wheel of the belt path ( 12 ), so that the rotor can transmit rotation to the drive wheel in order to drive the abrasive belt ( 11 ) in its abrasion movement, and   wherein the drive motor axis (Y 16 ) is oriented transversely with respect to the main central axis (X 2 ) at least in the base plane (P 10 ) at an angle between 85 degrees and 95 degrees with respect to the main central axis (X 2 ).   
     
     
         17 . The corrective grinding device according to  claim 14 , wherein the head movement system ( 23 ) is provided with a feed motor ( 27 ), separate from the belt-driving motor ( 16 ), in order to be able to move the machining head ( 10 ) along the base ( 5 ), in the feed direction (X 10 ), and
 wherein the projected surface of the feed motor ( 27 ) in the base plane (P 10 ) overlaps the projected surface of the abrasive belt ( 11 ).   
     
     
         18 . The corrective grinding device according to  claim 14 , wherein the head movement system ( 23 ) comprises a template rail ( 41 ) which extends in length along the feed direction (X 10 ) in order to guide the machining head ( 10 ), and of which the deflection, radially to the main central axis (X 2 ), can be adjusted by deforming the template rail ( 41 ) by means of one or more set screws so as to be able to make the feed path of the machining head conform to a desired curved profile of the surface to be ground ( 2 A). 
     
     
         19 . The corrective grinding device according to  claim 14 , wherein the applicator wheel ( 13 ) is mounted with the ability to rotate on the machining head ( 10 ) on an axis (X 13 ) which is parallel to the main central axis (X 2 ). 
     
     
         20 . The corrective grinding device according to  claim 14 , wherein the base ( 5 ) is formed by a beam ( 40 ) of which axial ends ( 5 A,  5 B) are each provided with a coupling member ( 6 ,  7 ,  8 ) allowing the beam ( 40 ) to be fixed to the frame ( 3 ), and of which a cross section is larger in its central portion than at the axial ends ( 5 A,  5 B), in order to improve rigidity of the beam ( 40 ) in the central portion. 
     
     
         21 . The corrective grinding device according to  claim 14 , wherein the coupling members ( 6 ,  7 ,  8 ) are provided with reversible fixing means so that the corrective grinding device ( 1 ) can be successively:
 (i) attached and fixed on the frame ( 3 ), so as to carry out a corrective grinding of a first part of revolution ( 2 ) mounted on the frame,   (ii) then detached from the frame ( 3 ) after corrective grinding of the first part of revolution ( 2 ), and   (iii) transported then fixed either to another location of the same frame ( 3 ), which location is associated with a second part of revolution ( 102 ,  202 ,  302 ) or to a different frame bearing a second part of revolution ( 102 ,  202 ,  302 ), in order to correctively grind the second part of revolution ( 102 ,  202 ,  302 ).   
     
     
         22 . The corrective grinding device according to  claim 14 , wherein the corrective grinding device comprises a single machining head ( 10 ) of which the useful feed stroke (L 10 ) is sufficient to allow the machining head ( 10 ) to cover, in one and a same continuous pass, an entire axial length of the surface to be ground ( 2 A) along the main central axis (X 2 ). 
     
     
         23 . The corrective grinding device according to  claim 14 , wherein the corrective grinding device comprises an adjustment mechanism ( 32 ) making it possible to adjust a depth of cut by which the abrasive belt ( 11 ) must penetrate into the part of revolution ( 2 ) to be ground, in the penetration direction (Y 10 ).