JPS5823802B2 - Assembly roll for rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly roll for rolling in which a sleeve is shrink-fitted into a part of the body in the axial direction, and is particularly intended to improve the means for assembling the sleeve IJ-b.

Some rolling rolls used for rolling flat steel, shaped steel, etc. have both a caliber portion and a flat portion without holes on the surface of the body for shaping.

In this type of roll, the material properties required for the grooved portion and the flat portion are different depending on the purpose of use.

That is, the hole-shaped portion requires the most heat cracking resistance, while the flat portion requires the most wear resistance.

However, it is extremely difficult to integrally manufacture rolls made of different materials depending on the axial direction of the body by means such as casting.

Therefore, in such a case, it is proposed to separately incorporate a sleeve made of a suitable material into the flat portion where wear resistance is required to form a partially assembled roll.

However, in the case of a lever, the means for assembling and fixing the sleeve is usually shrink fitting.

In other words, the tightening force of the shrink fit transmits the torque necessary for rolling to the sleeve from the roll body, and also prevents the sleeve from being thrust in the axial direction.

However, when assembling the sleeve by shrink fitting,
Shrink fitting generates a large tensile stress on the inner surface of the sleeve, which not only requires the sleeve to have a sufficiently large wall thickness, but also imposes restrictions on the strength of the sleeve due to its material.

Therefore, there is a limit to the selection of materials with emphasis on wear resistance for the sleeve, and the life of the sleeve is inevitably short.

In view of the above-mentioned problems, the present invention provides a built-in fixing means for the sleeve so that the required strength of the sleeve itself is small and a material with excellent wear resistance can be selected as the sleeve material. It has been improved,
The feature is that in an assembled roll in which a sleeve is shrink-fitted to a portion of the body in the axial direction, torque is transmitted from the roll body to the sleeve at the opposing portion between the side of the body that is integral with the roll body and the side of the sleeve. In addition to providing a retaining portion to prevent movement of the sleeve in the axial direction, an engaging portion is provided at a portion where the outer circumferential surface of the roll body and the inner circumferential surface of the sleeve come into contact with each other.

The present invention will be explained below with reference to the illustrated embodiments. In FIG. The body is integrally formed, that is, in the illustrated example, it is a caliber part, and 3 is a sleeve that is incorporated into a portion of the body in the axial direction, and is flush with the caliber part 2 in a predetermined assembled state. A flat part is formed continuously.

Therefore, an appropriate number of convex portions 4 are provided on the side surface of the sleeve 3 that is in contact with the hole portion 2, and a recess portion 5 is provided on the side surface of the hole portion 2 corresponding to the convex portions 4. It is being

Then, the sleeve 3 fits the convex part 4 into the concave part 5, so that the roll body 1 can receive torque from the roll body 1.
It is engaged with a body or aperture 2 which is integral with the body.

Further, the inner circumferential diameter of the sleeve 3 is the same as the outer circumferential diameter of the roll main body at the position where the sleeve is assembled, and continuous or discontinuous grooves 6 are provided in the inner circumferential surface of the sleeve 3 in the circumferential direction. Correspondingly, a protrusion 7 is provided on the outer peripheral surface of the roll body 1.

The sleeve 3 is engaged with the roll body 1 by fitting the protrusions 7 into the grooves 6 to prevent the sleeve 3 from moving in the axial direction of the roll body.

In this case, when assembling the sleeve 3, the sleeve 3
The sleeve 3 is arranged so that the inner diameter of the sleeve 3 is larger than the outer diameter of the protrusion 7.
When the sleeve 3 is cooled, the inner diameter of the sleeve 3 is the same as the outer diameter of the roll shaft.

In the roll assembled in this way, the torque necessary for rolling is transmitted to the sleeve 3 through the concave portions 5 and convex portions 4 with the hole portions 2.
At the same time, the necessary axial thrust prevention of the sleeve 3 is reliably prevented by the engagement of the grooves 6 and the protrusions 7 with the roll body 1.

Therefore, the sleeve 3 does not require a conventional shrink-fitting operation, and the inner diameter of the sleeve 3 can be expanded to be the same as the outer diameter of the roll body 1 at the installation position.

As a result, no tensile stress is generated in the sleeve 3 due to shrink fitting, the restrictions on the strength of the sleeve 3 are relaxed, a material with emphasis on wear resistance can be selected, and it is also possible to make the sleeve 3 thinner. Become.

Next, FIG. 2 shows another embodiment according to the present invention. In this case, a hole is formed on the inner peripheral surface of the sleeve 3 as an engaging portion for preventing the sleeve 3 from moving in the axial direction. A tapered part 6' having a tapered wall thickness on the part 2 side is provided, and a corresponding tapered part 7' is provided on the outer peripheral surface of the roll body 1, and the sleeve 3 is heated and expanded as in the case of the previous embodiment. The structure is such that it can be incorporated into the system.

Further, as for engaging the sleeve 3 with the hole part 2,
The convex portions 4 and concave portions 5 are different from those of the previous embodiment shown in FIG. A structure that engages with the corresponding recess 5' is adopted.

Even in this case, the same effects as in the above embodiment can be obtained.

Note that the shapes and sizes of the convex portions 4, 4', the corresponding concave portions 5, 5', the convex strip 7 tapered portion 7', and the corresponding concave groove 6 tapered portion 6' are as follows. The magnitude of the transmitted torque and thrust force is calculated and set to be able to withstand it sufficiently.In short, the torque is transmitted to the sleeve 3 from the hole 2 and the sleeve 3 is not moved on the roll body 1. Good.

The sleeve 3 and the hole 2 can also be engaged with each other using an adhesive to effectively transmit torque.

As described above, the present invention effectively applies the torque necessary for rolling to the sleeve that is shrink-fitted into a portion of the body in the axial direction through the retaining portion of the contact portion between the roll body and the side surface of the sleeve. In addition, thrust prevention of the sleeve is reliably achieved through the engagement structure of the contact portion between the inner circumferential surface of the sleeve and the outer circumferential surface of the roll body.

Therefore, the sleeve does not require shrink-fitting allowance as in the past.
The sleeve can be made of a material with excellent wear resistance, and the wall thickness of the sleeve can be made thin.

As described above, according to the present invention, the lifespan and economy of the sleeve are improved, and the economy and lifespan of the target partially assembled rolls can be increased.

[Brief explanation of drawings]

FIG. 1 I is a side cross-sectional view of an assembled roll according to the present invention;
Figure (2) is a sectional view taken along line A-A. FIG. 2 is a side sectional view of a main part of another embodiment. 1... Roll body, 2... Hole mold part, 3
...Sleeve, 4, 4shi...Protrusion, 5,
5'-...Concave portion, d...Concave groove, 7...
...Convex strip, 6/, 7/...Tapered part.

Claims (1)

[Claims] 1. In an assembled roll in which a sleeve is shrink-fitted to a portion of the body in the axial direction, an engaging portion for transmitting torque from the roll body to the sleeve is provided at the contact portion between the side surface of the body integral with the roll body and the side surface of the sleeve. 1. An assembly roll for rolling, characterized in that an engaging portion for preventing axial movement of the sleeve is provided at a contact portion between the outer circumferential surface of the roll body and the inner circumferential surface of the sleeve.