JPS633687Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is directed to improving rolling rolls used for hot rolling wire rods or bars.

Generally, as shown in FIG. 1, this type of rolling roll has a shaft 1 made of a material other than cemented carbide (e.g., steel) that has an outer periphery that prevents water, scale, etc. from entering the bearing (not shown). Labyrinth rings 2, 2 are fitted by shrink-fitting or press-fitting, and a caliber 3a is attached to the outer periphery of the shaft 1 between these labyrinth rings 2, 2.
A cemented carbide ring 3 and spacer rings 4 and 5 are fastened to the flange 6 by a tightening nut 7. Furthermore, although the bearing inner ring 8 is attached to this one, the bearing inner ring 8 may not be necessary depending on the type of bearing. Spacer rings 4 and 5 are necessary for positioning when there are two or more cemented carbide rings 3, but may be omitted when there is only one cemented carbide ring 3. be. Regarding the flange 6,
Alternatively, a tightening nut may also be used. Usually, the central portion of the shaft 1, that is, the portion from the flange 6 to the tightening nut 7, is made larger in diameter than both ends in consideration of the strength of the rolling roll.

By the way, during the rolling operation, a large amount of torque acts on the roll having the above configuration due to rolling. Therefore, when fixing the cemented carbide ring 3, it is necessary to tighten the tightening nut 7 with a force greater than the rolling torque. Conventionally, efforts have been made to obtain a predetermined tightening force using a hammer or the like, but the cemented carbide ring 3 often slips during rolling operations, resulting in rolling troubles. Furthermore, the coefficient of thermal expansion of cemented carbide and other metals such as steel is approximately 1:2, and as a result of the temperature rise during rolling, the shaft 1 is heated to a greater extent than the cemented carbide ring 2. Because the shaft 1 expands or bends or stretches due to the rolling load, the tightening force against the cemented carbide ring 3 is further reduced.

In addition, since the tightening nut 7 is tightened with strong force as described above, and the labyrinth rings 2 are fitted into the shaft 1 by shrink fitting, press fitting, etc., the attachment of the cemented carbide ring 3 is difficult. The drawback was that it took time to remove, making it unsuitable for high-mix, low-volume production.

Further, in order to prevent a decrease in the tightening force against the cemented carbide ring 3 due to the deflection of the shaft 1 described above, or to prevent variations in the finished diameter of the wire rod, a rolling roll with high strength has been desired.

This invention was made in consideration of the above-mentioned circumstances, and aims to provide a rolling roll with strong tightening of cemented carbide rings, easy attachment/detachment, and high strength.

An embodiment of this invention will be described below with reference to FIG. For convenience of explanation, the improvement in the strength of the rolling roll and the ease of attaching and removing the cemented carbide ring will be described first, and the improvement in tightening force, which is the main feature of this invention, will be explained later.

First, in terms of improving the strength of the rolling rolls, we focused on the fact that one of the conventional labyrinth rings 2, 2 described above does not need to be removed when attaching or removing the cemented carbide ring 3. However, it is formed integrally with the shaft 11. That is, in this embodiment, the left labyrinth ring 12a in FIG. 2 is formed integrally with the shaft 11 at the same position as the labyrinth ring 2 in FIG. Therefore, shaft 11 is the same as shaft 1.
Although the overall length is the same as that of
Labyrinth Ring 1
The small diameter portion of 2a is also integrated with the shaft 11, and the shaft 11 is also strengthened in this respect.

Further, the other labyrinth ring 12b is screwed to the shaft 11 in order to facilitate attachment and detachment of the cemented carbide ring 3. In this embodiment, the tightening nut 1 is
Shaft 11 with a screw of approximately the same size as 7.
However, if only the attachment and detachment of the cemented carbide ring 3 is considered, it is sufficient to make it at least larger than the bearing inner ring 8.
In addition, the positioning of the bearing inner ring 8 and the shaft 11
A portion corresponding to the lower half of the labyrinth ring 12b is formed on the shaft 11 in consideration of improving the strength of the labyrinth ring 12b.

On the other hand, the tightening force for the cemented carbide ring 3 is strengthened by the cylinder mechanism A provided on the tightening nut 17 and the elastic member 19 fitted to the shaft 11. First, regarding the tightening nut 17, a cylinder mechanism A for elastically deforming the elastic member 19 is provided on the side surface of the cemented carbide ring 3 side. This cylinder mechanism A has a ring-shaped groove 17a continuously provided in the circumferential direction on the end surface of the tightening nut 17 on the side of the cemented carbide ring 3, and a ring-shaped groove 17a that slides in this groove 17a in the axial direction of the shaft 11. Fitted freely, and one end has groove 1
It consists of a ring-shaped piston 20 protruding from 7a and a space S formed by the piston 20 at the bottom of the groove 17a for introducing pressurized fluid. In order to make this space S a sealed space, O-rings 21 and 22 are attached to the sliding surfaces of the piston 20 and the groove 17a. Further, the tightening nut 17 is provided with a passage 23 for introducing pressurized fluid such as hydraulic pressure or pneumatic pressure into the space S.

On the other hand, regarding the elastic member 19, when hydraulic pressure or the like is introduced into the space S from the outside and the piston 20 is displaced in the axial direction of the shaft 11, the elastic member 19 absorbs the displacement.
The amount of elastic deformation of the elastic member 19 corresponds to the amount of displacement of the piston 20, but the elastic energy stored in the elastic member 19 is not sufficient to obtain the required tightening force against the cemented carbide ring 3 described above. Should be set to a sufficient value. For this reason, a spring steel spring with a large spring constant is used here as the elastic member 19. In addition, when this elastic member 19 is attached to the rolling roll shown in FIG. 1 mentioned above, the overall length must be increased by that amount. However, in the rolling roll of this invention, since the labyrinth ring 12a is integrated with the shaft 11 and also serves as a flange, the above-mentioned margin α is created, and the elastic member 1 can be moved without changing the overall length.
9 can be installed. Therefore, this point is also advantageous in terms of strength. A plurality of spacers 24 are inserted between the tightening nut 17 and the spacer ring 5 to maintain the deformation when the elastic member 19 is deformed by the piston 20.

Next, when fixing the cemented carbide ring 3 and the spacer rings 4 and 5 set on the shaft 11, first apply pressure from the passage 23 to, for example, 400 kg/cm ² -
Apply hydraulic pressure of 1200Kg/ ^cm2 . Then, this oil pressure causes the piston 20 to move in the direction of the arrow while deforming the elastic member 19. At this time, since one labyrinth ring 12a is formed integrally with the shaft 11, and the other labyrinth ring 12b constitutes a double nut with the tightening nut 17, loosening due to rattling of the screw can be minimized. Then, a gap is created between the tightening nut 17 and the spacer ring 5 by the amount that the piston 19 has moved. Therefore, tighten the spacer 23 with a thickness corresponding to the gap between the tightening nut 17 and the spacer ring 5.
Sandwiched between. After this, when the hydraulic pressure applied to the space S is reduced, the elastic member 19 tries to restore its original shape.
The cemented carbide ring 3 is firmly fixed by the elastic force generated by the restoration. On the other hand, when removing the cemented carbide ring 3, pressurized fluid is introduced into the space S and the spacer 24 is removed. Then, no force is applied to the tightening nut 17, and it can be easily removed.

Although the spacer 24 is used in the above embodiment, if a valve is provided in the passage 23, for example, the piston 20 can be fixed in position while being displaced, and the spacer 24 becomes unnecessary.

Alternatively, as shown in FIG. 3, the inner circumferential side of the groove 17a of the tightening nut 17 may be opened, and a space S may be formed at the bottom of the groove 17a by the piston 20 and the outer circumference of the shaft 11. good. in this case,
It is also possible for the passage 23 to be provided within the shaft 11.

As explained above, according to the rolling roll of this invention, the cylinder mechanism A is provided in the tightening nut 17, the elastic member 19 is deformed by the cylinder mechanism A, and the elastic force of the elastic member 19 causes the cylinder mechanism A to deform. Since the hard metal ring 3 is tightened and fixed, the fixation can be made strong, and together with the fact that the labyrinth ring 12b is screwed, the cemented carbide ring 3 can be easily attached and removed. can be done. Furthermore, since the labyrinth ring 12a is formed integrally with the shaft 11, the strength of the shaft 11 can be improved, and therefore slip accidents of the cemented carbide ring 3 due to deflection and elongation during rolling can be further prevented. Gain,
This has effects such as being able to improve product quality.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional rolling roll;
The figure is a sectional view showing an embodiment of this invention, and FIG. 3 is a partially omitted sectional view of a rolling roll provided with a cylinder mechanism different from the cylinder mechanism shown in FIG. 2. 3... Cemented carbide ring, 11... Shaft,
12a, 12b... Labyrinth ring, 17...
Tightening nut, 17a...groove, 19...elastic member,
20... Piston, A... Cylinder mechanism, S...
space.

Claims (1)

[Claims for Utility Model Registration] 1. Two labyrinth rings on the outer periphery of a shaft made of a material other than cemented carbide to prevent water, scale, etc. from entering the bearing, and a tightening nut between these labyrinth rings. In a rolling roll equipped with a cemented carbide ring tightened by
A ring-shaped piston 20 is mounted on the inside of the tightening nut 17, which is adjacent to the outside of the shaft 11 and fixed to the outer periphery of the shaft 11 with screws, and located on the opposite side of the screwed labyrinth ring 12b. The cylinder mechanism A including the piston 20 is built in, and the shaft 1 is
1. A rolling roll characterized in that an elastic member 19 is fitted to the outer periphery of the shaft 11 near a labyrinth ring 12a integral with the shaft 11. 2 The cylinder mechanism A includes a ring-shaped groove 17a continuously provided in the circumferential direction on the end surface of the tightening nut 17 on the side of the cemented carbide ring 3, and this groove 17a.
A piston 2 is fitted into the shaft 11 so as to be slidable in the axial direction of the shaft 11, and one end thereof protrudes from the groove 17a.
0 and a space S for introducing pressurized fluid formed by the piston 20 at the bottom of the groove 17a.