Abrading – Abrading process – Roll – roller – shaft – ball – or piston abrading
Patent
1995-12-07
1997-04-01
Rose, Robert A.
Abrading
Abrading process
Roll, roller, shaft, ball, or piston abrading
451123, 451142, 451242, 451397, 451428, B24B 100
Patent
active
056160682
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and to a device for grinding the rollers of rolling mill roller-guides, and a roller guide which enables the method to be carried out.
2. Description of the Related Art
High demands are placed on the bearings of guide rollers of the kind which function to guide rolled metal in between the rolls of a rolling mill, with the intention of preventing a bearing fracture that would interrupt continuity in production. Ideally, the guide bearings will have the same useful life span as the mill rolls. This aim has not been achieved in practice, despite endeavors to eliminate play in the bearings and to prevent bias loads acting thereon, by using prestressed precision bearings which are press-fitted into their respective bearing surfaces. This problem is particularly accentuated in modern rolling mills in which rolling speeds will reach 100 m/sec, and particularly in the final stage of the rolling mill where the guide rollers are required to rotate at very high speeds. The useful life span of present day roller guide bearings is not sufficiently long to permit still higher rolling speeds and the higher loads on the mill guide rollers that are occasioned by these higher rolling speeds.
The object of the present invention is to increase the life span of roller guide bearings in rolling mills.
SUMMARY OF THE INVENTION
According to the present invention this object is achieved with a method of grinding circumferential grooves in the roller-guide rollers of rolling mills, characterized in that the guide rollers are caused to rotate in their own bearings while grinding a groove. In this way, the groove formed in the roller will always lie precisely at right angles to the rotational axis of the roller and the rolled metal will move precisely in the rolling line.
The invention also relates to a device for carrying out the method, said device being characterized in that it includes a carrier which supports a roller-guide roller and its bearing such as to enable the roller to rotate freely in its bearing, a grinding tool which is movable in a radial direction relative to a roller supported by the carrier, and means for rotating the roller.
BRIEF DESCRIPTION OF THE DRAWINGS
A roller guide constructed in accordance with the invention is characterized in that the roller-guide roller and its bearing are built together to form a unit which can be readily detached from the remainder of the guide.
An exemplifying embodiment of the invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 illustrates from above one embodiment of an inventive roller guide;
FIG. 2 is a front view of the guide shown in FIG. 1;
FIG. 3 is a sectional view taken on the line III--III in FIG. 1;
FIG. 4 illustrates the roller and the roller bearing of a roller guide according to FIG. 3; and
FIG. 5 illustrates schematically an embodiment of an inventive device for grinding grooves in the roller illustrated in FIGS. 1-4.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 to 4 illustrate a roller guide for rolling mills, said guide being constructed to permit the inventive grinding method to be applied. The roller guide includes conventionally two circumferentially grooved and rotatable rollers 1 and 2 which guide rolled material 3 (see FIG. 2) therebetween in a metal rolling operation. The rollers 1 and 2 are carried by arms 4, 5, which are in turn carried by a holder 6.
In accordance with the invention, the rollers 1, 2 and their respective journals or bearings have the form of units 7 which can be readily attached to and removed from the arms 4, 5. FIG. 4 is an exploded view of one such unit 7. In addition to the roller 2, this unit also includes an attachment sleeve 8, a bearing shaft 9 and a bearing part 10 which is comprised of two pairs of angle contact bearings 11, 12 which are separated by two co-ground spacing rings 13 which are intended to impart a suitable axial bias to the bearings. As best seen fro
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Morgardshammar AB
Nguyen George
Rose Robert A.
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