JPS633688Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in rolling rolls used for hot rolling wire rods or bars, particularly those with labyrinths.

Generally, as shown in FIG. 1, this type of rolling roll includes a cemented carbide ring 1 having a caliber 1a for forming a groove on the circumferential surface, and a cemented carbide ring 1.
Tightening nut 3 for fixing to shaft 2
and a labyrinth ring 4 (not shown) that prevents water, scale, etc. from entering the bearing are attached to the outer periphery of the shaft 2 in the axial direction of the shaft 2 in the order shown in the drawing. In the illustrated case, an outward flange 30 integral with the shaft 2 is used for one of the adjacent cemented carbide rings 1, but a tightening nut 3 similar to the other one may be used instead.

By the way, in this type of rolling roll, in order to receive a large load, the shaft 2 is provided with a bearing inner ring 5.
Generally, one end surface 5a of the labyrinth ring 4 is abutted against the end surface 4a of the labyrinth ring 4 in order to control the position of the labyrinth ring 4.

However, with such conventional rolling rolls, it may be difficult to attach or remove the cemented carbide ring 1. That is, in hot rolling of wire rods, bars, etc., in production of small variety and large quantities, once the cemented carbide ring 1 is set on the shaft 2, the cemented carbide ring 1 is removed from the shaft 2 unless there is any trouble. That is unnecessary. However, in the case of high-variety, low-volume production, it is necessary to use different rolling rolls depending on the rolled product. However, with the conventional rolling rolls, the cemented carbide ring 1 cannot be easily removed from the shaft 2, so it is necessary to prepare a large number of rolling rolls for each rolled product, and the storage space and rolling The cost problem of the rolls was unavoidable.

Moreover, such a problem similarly occurs in the case of re-polishing the cemented carbide ring 1. The cemented carbide ring 1 is polished using a diamond grindstone, but not all user steel mills necessarily have the polishing technology using a diamond grindstone, and most of them request the manufacturer for re-polishing.
Therefore, even in such a case, it is convenient if only the cemented carbide ring 1 is removed and transported.

This invention was made in consideration of the above points, and provides a rolling roll with a labyrinth that allows the cemented carbide ring 1 to be easily attached and removed.

Hereinafter, while referring to the attached figures 2 to 6,
The mill roll with labyrinth according to this invention will be explained in detail.

Regarding the rolling roll with a labyrinth according to this invention, the arrangement order of the cemented carbide ring, the tightening nut, the labyrinth ring, and the inner ring of the bearing, and the fact that the end face of the inner ring of the bearing is in contact with the end face of the labyrinth ring are as described above. This is the same as the conventional example.

The feature of this invention is that the labyrinth ring 41 in such a device is divided into two in the axial direction as shown in FIGS. It is fixed to the shaft by mechanical fastening means. Here, since the inner diameter of the cemented carbide ring is generally larger than the outer diameter of the bearing inner ring, according to this invention,
Labyrinth ring 4 without removing the bearing inner ring
1 can be easily removed.

In the illustrated embodiment, the labyrinth ring 41 is divided into two parts, which are also simple linear divisions, but it may be divided into three parts, or the area of the mating surface 6 may be increased as shown in FIGS. 4 to 6. It can also be divided into various shapes such as If the mating surfaces 6 of the divided pieces 41a and 41b are made in this way, the intrusion of cooling water etc. can be more effectively prevented. Of course, by interposing a sealing material such as rubber or resin on the mating surfaces 6 of the respective pieces 41a, 41a, the sealability of that portion can be improved.

Further, in the case of the embodiment, the screw holes 7 are provided in the radial direction and each piece 41a, 41b is fixed directly to the shaft 1, but the screw holes are provided in the axial direction and the set screw is tightened so that one side of the nut is fixed. It is also possible to indirectly fix each piece 41a, 41b to the shaft 1 by applying the same.

In addition, when each piece 41a, 41b is tightened with a ring, the mating surface 6 can be covered by the tightening ring, and by providing unevenness on the outer circumferential surface of the tightening ring, it is possible to prevent cooling water, etc. from flowing into the bearing. Since the infiltration path can be made longer, it is also advantageous in terms of its function as a labyrinth. Further, in this case, if each piece 41a, 41b is temporarily fixed in some way inside the tightening ring, it is extremely advantageous for attaching and removing the labyrinth ring.

In any case, in this invention, the labyrinth ring is divided into a plurality of pieces in the axial direction, and each divided piece is fixed to the shaft by mechanical fastening means such as screws or ring tightening. Therefore, an excellent effect can be obtained in that the labyrinth ring can be removed without removing the bearing inner ring.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a general example of a rolling roll with a labyrinth ring of this type, Figures 2 and 3 are
The figures show an example of a labyrinth ring according to an embodiment of this invention, Fig. 2 is a plan view, Fig. 3 is a side sectional view, and Figs. 4 to 6 are plan views showing other examples of the labyrinth ring. It is. 1... Cemented carbide ring, 2... Shaft, 3
... Tightening nut, 41 ... Labyrinth ring, 4
1a, 41b...Each piece, 5...Bearing inner ring.

Claims (1)

[Scope of utility model registration request] A cemented carbide ring with a caliber on its circumference, a tightening nut for fixing the cemented carbide ring to the shaft, a labyrinth ring to prevent water, scale, etc. from entering the bearing, and a bearing inner ring. A cemented carbide ring, a tightening nut, a labyrinth ring, and a bearing inner ring in this order in the axial direction of the shaft,
and a rolling roll with a labyrinth attached to the outer periphery of the shaft with the end face of the bearing inner ring abutting the end face of the labyrinth ring, the labyrinth ring being divided into a plurality of parts in the axial direction, and each piece of the divided labyrinth ring is fixed to the shaft by mechanical fastening means such as screwing or ring tightening, and the inner diameter of the cemented carbide ring is larger than the outer diameter of the inner ring of the bearing. Rolling roll with labyrinth.