Roll arrangement
The invention relates to a roll arrangement for use in metallurgical technology, comprising a roll that has a roll barrel ( 11 ) and two roll necks ( 10 ), and at least one neck bushing ( 20 ) for accommodating at least one of the roll necks without a clearance in a rotationally fixed manner. In order to increase the load-bearing capacity of the roll bearing without increasing the size of or the mounting space for the roll arrangement, a circumferential cavity is formed between the neck bushing ( 20 ) and the roll neck ( 10 ) in the unloaded state of the roll arrangement.
1. A roll arrangement ( 100 ) for use in metallurgy, comprising a roll having a roll barrel ( 11 ) and two roll necks ( 10 );
at least one neck bushing ( 20 ) for receiving at least one roll neck ( 10 ) for joint rotation therewith and without a radial clearance,
characterized in that
in an unloaded condition, a circumferential rotationally symmetrical hollow space ( 12 ) is formed between the neck bushing ( 20 ) and the roll neck ( 10 ) at least in partial region therebetween, and the hollow space ( 12 ) is limited, viewed in a longitudinal direction of the roll arrangement ( 100 ), by a rotationally symmetrical concave shape of the outer surface ( 13 ) of the roll neck ( 10 ) and/or of the inner surface ( 21 ) of the neck bushing.
2. An arrangement according to claim 1 ,
characterized in that
the outer surface ( 13 ) of the roll neck ( 10 ) or the inner surface ( 21 ) of the neck bushing ( 20 ) continues, in the region of its concave shape, when viewed in the longitudinal direction of the roll arrangement ( 100 ), at least sectionally in form of a straight-line, a sinus curve, a polygonal curve R(x)n-tenth degree, or as combination thereof.
3. An arrangement according to claim 2 ,
characterized in that
a profile of the outer surface ( 13 ) of the roll neck ( 10 ) or the inner surface ( 21 ) of the neck bushing ( 20 ) in a region of its concave shape, when viewed in the longitudinal direction of the roll arrangement ( 100 ), in the transition region between two adjacent sections, is continuously differential.
4. An arrangement according to claim 1 ,
characterized in that
a volume of the hollow space ( 12 ) is formed so that it conforms to a maximal bearing force in a loaded condition as long as deformation of the neck bushing ( 20 ) remains in an elastic region.
5. An arrangement according to claim 1 ,
characterized in that
the outer surface ( 13 ) of the roll neck ( 10 ) and the inner surface ( 21 ) of the neck bushing are formed as truncated cone.
6. An arrangement according to claim 1 ,
characterized in that
the outer surface ( 13 ) of the roll neck ( 10 ) and the inner surface ( 21 ) of the neck bushing ( 20 ) are cylindrical.
7. An arrangement according to claim 1 ,
characterized in that
the roll is formed as back-up roll, intermediate roll, or work roll for use in a rolling mill stand.
8. An arrangement according to claim 1 ,
characterized in that
the arrangement further comprises:
at least one chock ( 50 ) with a bearing bushing ( 51 ) in which the neck bushing ( 20 ), together with the roll neck ( 10 ) and/or with the roll, is received, with a load-carrying oil film ( 30 ) being provided between the neck bushing ( 20 ) and the bearing bushing ( 51 ).