JPS61253107A - Tapered neck bearing of roll for rolling mill - Google Patents

Abstract

PURPOSE:To detain a sleeve to a rolling roll so as not to rotate without receiving rolling load in the part of a key by providing the key between the step part formed between the body part of the rolling roll and tapered neck part thereof and the end part of the sleeve. CONSTITUTION:The key 6 has an annular part 6a along the end part 1a of the sleeve 1 and two projecting parts 6b projecting from the part 6a toward the step part R4. The annular part 6a is attached by a screw to the end part 1a of the sleeve 1 and the two projecting parts 6b fit into key holes R5 provided to the step part R4 of the roll R. Only the rotating force of the roll R is therefore exerted to the key 6 and the rolling load of the roll R does not act thereto. Since the step part R4 is larger in diameter than the tapered neck part R1, the torque that the key 6 receives is smaller and the key 6 itself is made smaller in size hence advantageous in space.

Description

[Detailed Description of the Invention] [Industrial Applicability] This invention provides a rolling mill that constitutes an oil film bearing by a bushing on the roll chock bearing side and a sleeve that is fitted to the tapered neck portion of the rolling roll in a non-rotating manner. This relates to a tapered neck bearing for machine rolls.

[Prior art] Conventionally, this type of tapered neck bearing is shown in Fig. 4.
There are those shown in FIGS. 5 and 6. The ones in FIGS. 5 and 6 are improved versions of those in FIG. 4.

First, in the case shown in Fig. 4, the sleeve 1 is fitted onto the tapered neck portion R5 of the rolling roll R, and the key 2 is inserted into the keyway in the fitted portion to prevent the sleeve 1 from rotating around the roll R. ing. The sleeve 1 and the bushing 4 of the roll cock sleeve holder 3 constitute an oil film bearing. Reference numeral 5 denotes a sleeve holder, which is fitted onto the shaft end of the roll R.

However, when the key 2 is provided in the fitting portion between the tapered neck portion R1 of the roll R and the sleeve 1 in this way, large fluctuations of the rolling blade occur periodically as the roll R rotates. This is because of the gap between the key 2 and the bottom of the key groove on the sleeve l side. This was because elastic deformation occurred and the rolling blade suddenly lowered.

The devices shown in FIGS. 5 and 6 were devised to solve this problem.

The tapered neck portion R of the roll R,
The straight neck part R2 that came off and the sleeve! By inserting the key 2 into the key groove at the fitting portion, the sleeve l is fitted onto the rolling roll R in a manner that it is prevented from rotating. With such a configuration, it is possible to prevent the rolling blade applied to the rolling roll R from exerting a large effect on the key 2 portion, thereby eliminating fluctuations in the rolling blade. In addition, the roll neck portion R5 of the rolling roll R is shown in FIG.
shorten the keyway and key 2, and shorten the sleeve l.
By shortening the keyway of the sleeve 1, when the keyway of the sleeve 1 and the pressure receiving position of the roll chock bearing 3 and the bushing 4 that receive the rolling force applied to the rolling roll R coincide, the rolling force is suddenly reduced. was avoided. However, even with such a tapered neck bearing, problems still remain.

[Problems to be Solved by the Invention] The problems in the tapered neck bearing shown in FIGS. 5 and 6 are as follows.

That is, in the case of the one shown in FIG. 5, large fluctuations in the rolling blade can be suppressed because the key 2 is not located at a position that receives a large rolling load, but the key 2 is located at the straight neck portion R2 of the rolling roll R with a small diameter. , the entire roll must be lengthened by the length of the key 2 of its straight neck portion R2, which is disadvantageous in terms of space. On the other hand, in the case of FIG. 6, the key 2 is still located on the rolling roll R side.

The outer periphery and sleeve! This is still the part that fits with the inner peripheral part of the side, and a rolling load is applied to this part of the fit. Therefore, fluctuations in the rolling blade cannot be completely eliminated. Further, since the key 2 is located in the tapered neck portion R1 and the straight neck portion R1 of the rolling roll R, which have a small diameter, the torque that the key 2 receives is large, and as a result, the key 2 must be made large.

Moreover, it is disadvantageous in terms of space to provide such a key 2 in a narrow portion of the shaft end portion of the rolling roll R.

This invention is intended to solve such problems.

[Means for Solving the Problems] The tapered neck bearing for a roll for a rolling mill according to the present invention has a bushing on the roll chock bearing side and a sleeve fitted to the tapered neck portion of the rolling roll to prevent rotation. In the tapered neck bearing of a roll for a rolling mill, the sleeve is placed between the stepped part between the body of the rolling roll and the tapered neck part, and the end of the sleeve opposite to this stepped part. It features a key that prevents rotation.

[Function] The tapered neck bearing for a roll for a rolling mill according to the present invention has a stepped portion between the body portion and the tapered neck portion of the rolling roll;
A key located between the end of the sleeve facing this stepped part prevents the sleeve from rotating around the rolling roll without receiving rolling load on the key part, eliminating fluctuations in the rolling blade, and at the same time To make the key shadow of a vehicle by reducing the torque applied to the key, and to make the arrangement of rolls advantageous in terms of space.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

In this invention, the step portion R4 between the body portion R1 of the rolling roll R and the tapered neck IN (It), and the step portion R4
Sleeve facing the! The end of! between a and sleeve 1
A key 6 is provided to prevent rotation of the rolling roll R. In this example, the key 6 has a shape including a ring-shaped portion 6a along the end portion 1a of the sleeve weight, and two protrusions 6b protruding from the ring-shaped portion 6a toward the stepped portion R1 side of the roll R. (See Figure 3). The two protrusions 6b are provided 180° apart in the circumferential direction of the tongue-shaped portion 6a. The ring-shaped portion 6a of the key 6 is attached to a sleeve by a screw (not shown). It is integrally attached to the end portion 1a of the roll R, and its two projections 6b fit into a keyhole R5 provided in a stepped portion R4 of the roll R. That is, the key 6 fits into the keyhole Rs of the roll R from the axial direction of the roll R.

In this way, the key 6 provided between the stepped portion R4 of the roll R and the end portion 1a of the sleeve I prevents the sleeve 1 from rotating relative to the roll R. To prevent rotation, the key 6 is fitted into the roll R from the axial direction thereof, so that only the rotational force on the roll R is applied to the key 6, and the rolling load of the roll R does not act on the key 6. Therefore, the rolling blade does not fluctuate due to the presence of the key 6. Also, since the stepped portion R4 in the roll R has a larger diameter than the tapered neck portion RI, it is natural that the keyhole R4 is larger in diameter than the tapered neck portion RI.
6 is located on the outer side in the radial direction than the tapered neck portion R1. The torque that the key 6 receives between it and the key hole R3 located as such a large diameter portion is small, and as a result, the key 6 itself can be made smaller. Moreover, providing the key 6 for the stepped portion R4 of the roll R, which is the large diameter portion, is more advantageous in terms of space than providing the key 6 for the shaft end portion of the roll R, which is the small diameter portion.

By the way, the configuration of the key 6 is not limited to the above-mentioned embodiment, and the key is that the key 6 is interposed between the stepped portion R4 of the rolling roll R and the end portion 1a of the sleeve 1 facing the stepped portion R. , any material that prevents the sleeve l from rotating around the rolling roll H may be used.

Further, the present invention is also applicable to the conventional existing devices shown in FIGS. 4 and 5. In other words, it is possible to cope with this by eliminating the key 2 in those existing ones, filling in those key grooves, and providing the key 6 in the stepped portion R4 of the roll R as in the one of the present invention.

[Effects of the Invention] As explained above, the rolling mill mouth-luno tapered neck bearing according to the present invention has a stepped portion between the body of the rolling roll and the tapered neck portion, and an end of the sleeve opposite to this stepped portion. By providing a key for preventing rotation of the sleeve with respect to the rolling roll between the rolling part and the rolling roll, it is possible to avoid applying rolling load to the key part and eliminate fluctuations in the rolling blade. Moreover, at the same time, the torque applied to the key is reduced, so that the key can be made smaller, and the roll arrangement can be advantageous in terms of space.

[Brief explanation of the drawing]

FIGS. 1 to 3 represent one embodiment of the present invention.
2 is an enlarged sectional view of a portion of the key, FIG. 3 is a plan view of the key, and FIGS. 4, 5, and 6 are longitudinal sectional views showing different conventional examples. ! ... Sleeve, 3 ... Roll chock bearing, 4 ... Bushing, 6 ...
...Key, R...Rolling roll. Figure 4 Figure 6 R2R1

Claims (1)

[Claims] The bushing on the roll chock bearing side and the sleeve fitted to the tapered neck part of the rolling roll to prevent rotation are used to form an oil film bearing. A tapered neck bearing for a roll for a rolling mill, characterized in that a key is provided between a step between the neck and the end of the sleeve opposite the step to prevent the sleeve from rotating around the rolling roll. .