JPH0434963Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a rolling roll that is used by being fitted around the outer periphery of a shaft, and in particular, the invention relates to a rolling roll that is used by being fitted around the outer periphery of a shaft. This invention relates to a rolling roll that is less likely to cause damage or cracks.

"Prior Art" FIGS. 5 and 6 show an example of a conventional rolling roll. This conventional rolling roll 1 is integrally made of a hard material such as sintered high speed steel, high speed steel or cold die steel, and has a key inserted into the inner surface to prevent rotation between it and the shaft. A groove 2 is provided. In addition, rolling roll 1
is often heat-treated to increase its wear resistance, and its hardness is usually increased to H _R C58-65. When heat treatment is applied in this manner, although the wear resistance is improved, the toughness is reduced, and many problems occur, such as breakage at the corners of the keyway 2 and cracks at the corners.

The present invention was developed in view of the above circumstances, and aims to provide a rolling roll that maintains the required hardness of the outer roll and is less likely to cause breakage or cracks at the rotation stopper part with the shaft. It is.

"Means for Solving the Problems" The present invention consists of a ring provided with a flange at one end, and a sleeve fitted around the outer circumference of the ring in contact with the flange on the ring. The outer periphery is formed in a tapered shape that gradually increases in diameter toward the brim side, and the inner surface of the sleeve is formed in a tapered shape corresponding to the outer periphery of the ring, and the sleeve has a diffused shape with respect to the ring at both the taper portion and the brim. It has a joined configuration.

``Function'' The outer roll surface side can be made of a hard material and the inner shaft contacting part side can be made of a tough material, ensuring wear resistance of the outer roll surface while maintaining the inner keyway portion. This can prevent breakage and cracks from occurring.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 and 2 show a rolling roll according to the present invention, and this rolling roll includes a ring 12 provided with a collar 11 at one end, and a ring 12 with its end in contact with the collar 11. The sleeve 13 is fitted around the outer periphery of the sleeve 12. The ring 12 is made of a material with high toughness, such as structural steel, and its outer periphery is formed into a tapered shape whose diameter gradually increases toward the collar 11 side. On the other hand, the sleeve 13 is made of a material with excellent wear resistance, such as sintered high speed steel, high speed steel, cold die steel, etc., and the inner surface is formed into a tapered shape corresponding to the outer peripheral tapered portion of the ring 12. There is. The sleeve 13 is diffusion bonded to the ring 12 and the tapered collar 11, respectively. Further, a keyway 14 is provided in the inner peripheral portion of the ring 12. Further, in this rolling roll, the width of the ring 12 is set to approximately the same value as the width of a conventional rolling roll, and the roll width is increased by the width of the collar 11.

Here, to explain the method for manufacturing the above-mentioned rolling roll, as shown in FIG. 3, the sleeve 13 is fitted around the outer periphery of the ring 12 in a vacuum furnace.
While maintaining the ambient temperature at 1000°C to 1250°C, both the ring 12 and the sleeve 13 are pressurized in the direction in which they approach each other. Left end 13a in the figure of the collar 11 of the ring 12 and the sleeve 13 at the initial stage of fitting
The gap C between the two is set to an optimal value by the taper angle θ. FIG. 4 shows the ideal value of the gap C when changing the taper angle θ obtained as a result of various experiments, and the value of the gap C is determined along this ideal line. Also, the pressure when applying pressure is 0.01 to 0.05
Preferably, it is Kg/mm ₂ . If the pressure is too low, the diffusion bonding of the collar 11 will be poor, and if the pressure is too high, the sleeve 13 and ring 11 will be deformed.

"Effects of the Invention" As explained above, according to the rolling roll of the present invention, the outer roll surface can be made of a hard material and the inner shaft contacting part can be made of a tough material. While ensuring the wear resistance of the surface, it is possible to prevent breakage and cracks from occurring in the inner key portion.

In addition, since the inner ring is made of a material with high toughness, it is possible to transmit high torque.
In addition, the ring can be easily processed to create keyways and screws.

Furthermore, the sleeve and ring are not only diffusion bonded between the inner and outer circumferential portions, but also the end of the sleeve is bonded to the brim of the ring.
Of course, it is possible to firmly connect the two,
In addition, since the sleeve and ring work together to increase the rigidity of the rolling roll, it is possible to realize highly accurate rolling.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rolling roll according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is an explanatory diagram showing the method of manufacturing the rolling roll during production, and Fig. 4 is a diagram showing the taper of the sleeve and ring. FIG. 5 is a sectional view showing an example of a conventional rolling roll, and FIG. 6 is a side view thereof. 11...Brim, 12...Ring, 13...Sleeve.

Claims (1)

[Scope of utility model registration request] Consisting of a ring with a brim at one end, and a sleeve fitted around the outer periphery of the ring while in contact with the brim, the outer periphery of the ring is formed into a tapered shape that gradually increases in diameter toward the brim. A rolling roll characterized in that the inner surface of the sleeve is tapered to correspond to the outer periphery of the ring, and the sleeve is diffusion bonded to the ring at both the tapered portion and the collar.