JPH1024304A - Composite ring roll with key way - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost and running cost. SOLUTION: A composite ring roll 10 with a key way is constituted of an inner ring 14 in the middle part of which a through hole 14a through which a shaft is inserted and an outer ring 16 which is fit and fixed to the outer periphery of this inner ring 14. In one end part in the axial direction of the inner ring 14, the key way 14b which is fit to a key formed on the shaft is correspondently formed. The outer ring 16 is formed using high-speed steel having wear resistance as the material and the through hole 16a whose internal diameter is slightly smaller than the outside diameter of the inner ring 14 is formed in the middle part of the outer ring. The outer ring 16 is surely fit on and fixed to the inner ring 14 by shrinkage fitting method for inserting the inner ring 14 into the through hole 16a which is thermally expanded by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite ring roll with a key groove in which an outer ring having wear resistance is fitted and fixed to the outer periphery of an inner ring having a key groove.

[0002]

2. Description of the Related Art Rolling rolls used for hot rolling of wires and bars are formed of a hard material having excellent wear resistance in order to improve the rolling speed and extend the life of the rolls. It is desired. However, since forming the entire roll with an expensive hard material increases the manufacturing cost, a separate ring formed of a hard material is generally used.
2. Description of the Related Art A key is used to externally fit on a roll surface so as to be integrally rotatable.

[0003]

As the hard material, for example, high-speed steel is excellent, but since this high-speed steel is expensive and brittle, it is difficult to form the entire ring integrally with high-speed steel in terms of strength and economy. Disadvantageous. Further, it is extremely difficult to machine a keyway in a HSS ring, and there is a risk that cracks or the like may occur during the machining.

Therefore, a key groove is formed in a ring formed of a metal material which is easy to process a key groove, and a high speed steel powder is sintered on the outer periphery of the ring by hot isostatic pressing (HIP). A composite ring having a hard layer with a required thickness has been proposed. However, even in the case of this composite ring, it is inevitable that the hard layer will wear over time, and when it becomes unsuitable for use, it is necessary to replace the entire composite ring, which increases the running cost. be pointed out.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem suitably. A composite ring which can reduce the manufacturing cost and the running cost is provided. The purpose is to provide a role.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and appropriately achieve the intended purpose, a composite ring roll with a key groove according to the present invention is provided on the outer periphery of an inner ring having a key groove. An outer ring formed of a material having wear resistance is detachably fitted and fixed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a composite ring roll with a key groove according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments.

FIG. 1 is a longitudinal sectional view showing a composite ring roll with key grooves according to an embodiment of the present invention. In the roll 10, a through hole 14a through which a shaft 12 can be inserted is formed in the center. Inner ring 14 and this inner ring 14
And an outer ring 16 fitted and fixed to the outer periphery of the outer ring. The inner ring 14 is made of, for example, chrome molybdenum steel.
(SCM) or the like, and at one axial end thereof, as shown in FIGS. 2 and 3, a key groove to be fitted to a plurality (three in this embodiment) of keys 12a formed on the shaft 12. 14b is formed correspondingly. The keyway 14
"b" is formed corresponding to the key 12a provided on the shaft 12 on which the roll 10 is mounted, and the position and number thereof are set according to the specifications of the target shaft 12. The material of the inner ring 14 is not limited to chromium molybdenum steel, but other structural alloy steels can be used as appropriate.

The outer ring 16 is formed of a wear-resistant material such as high-speed steel (high-speed tool steel). A through hole 16a having an inner diameter slightly smaller than the outer diameter of the inner ring 14 is formed at the center thereof. Have been. The outer ring 16 is formed by a shrink fitting method in which the inner ring 14 is inserted into the through hole 16a thermally expanded by heating.
Is securely fixed. A caliber 16b having a U-shaped cross section is formed on the outer peripheral surface of the outer ring 16.
The caliber 16b formed on the outer ring 16 is arbitrarily set in accordance with a concave shape, a convex shape, a flat shape, and other product shapes to be rolled. As the material of the outer ring 16, other than high-speed steel, a cemented carbide, a die steel, or a cermet obtained by mixing a ceramic material and a metal material can be appropriately used. Further, examples of a method of manufacturing the outer ring 16 include casting, forging, and powder metallurgy.

[0010]

Next, the operation of the composite ring roll with key grooves according to the embodiment configured as described above will be described.
A key groove 14b is formed in the inner ring 14 at a position corresponding to the key 12a of the shaft 12 to be mounted, and an outer ring 16 is shrink-fitted around the outer periphery of the ring 14. The composite ring roll 10 with a key groove is externally fitted to the shaft 12 through the through hole 14a of the inner ring 14, and a key groove 14b is formed in the key 12a of the shaft 12.
By fitting them, as shown in FIGS. 2 and 3,
A key ring composite ring roll 10 is mounted on the shaft 12. Since the inner ring 14 is formed of a general structural alloy steel or the like, the key groove processing on the ring 14 can be performed without any trouble.

When the material to be rolled is rolled by using the composite ring roll 10 having key grooves attached to the shaft 12, the caliber 16b of the outer ring 16 of the roll 10 is brought into contact with the material to be rolled over time. Wear out. Then, when the desired rolling cannot be performed, the composite ring roll 10 with the key groove is removed from the shaft 12.
This may be addressed by removing the worn outer ring 16 from the inner ring 14 and externally securing a new outer ring 16. That is, in the composite ring roll 10 with a key groove according to the embodiment, only the worn outer ring 16 can be replaced, so that the inner ring 14 can be reused and the running cost can be reduced. In order to remove the outer ring 16 from the inner ring 14, the outer ring 16 is removed while being heated,
Or it is removed by cutting.

Although the embodiment has been described with respect to the case where the outer ring is fitted and fixed to the inner ring by shrink fitting, the present invention is not limited to this. For example, mechanical means such as a wedge and a lock nut are provided. It can also be fitted and fixed.

[0013]

As described above, according to the composite ring roll with a key groove according to the present invention, the outer ring made of a wear-resistant material is provided on the outer periphery of the inner ring in which the key groove is formed. By being detachably fitted and fixed, the amount of wear-resistant material used can be reduced, and the manufacturing cost can be reduced. When the outer ring is worn due to use, it can be dealt with by removing the outer ring from the inner ring and fitting and fixing a new outer ring to the inner ring. That is, since the inner ring is reusable, the running cost can be reduced, which has an economic advantage.

[Brief description of the drawings]

FIG. 1 is a sectional view of a composite ring roll with a key groove according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which the composite ring roll with key grooves according to the embodiment is externally fitted to a shaft.

FIG. 3 is a side view showing, in partial cross section, a state in which the composite ring roll with a key groove according to the embodiment is externally fitted to a shaft.

[Explanation of symbols]

 14 inner ring 14a keyway 16 outer ring

Claims (3)

[Claims] An inner ring (1) having a keyway (14b) formed therein.
A composite ring roll with a key groove, wherein an outer ring (16) formed of a material having wear resistance is detachably fitted and fixed around the outer periphery of (4). 2. The composite ring roll with keyway according to claim 1, wherein the outer ring (16) is shrink-fitted to the inner ring (14). 3. The composite ring roll with a keyway according to claim 1, wherein said outer ring is made of high-speed steel.