JPS591128B2 - Assembly roll for rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rolling assembly in which a body sleeve is fired, and a neck sleeve adjacent to the body sleeve which is not subjected to rolling is fitted and fixed onto the roll shaft using a fixture. Regarding rolls, in particular, torque is transmitted from the neck sleeve to the torso sleeve.

This invention relates to a device in which the firing margin of the body sleeve can be reduced.

Steel rolling rolls have different properties required for the body, which is in direct contact with the rolled material, and the roll shaft, so the body is made of a material with excellent wear resistance and heat cracking resistance.

So-called composite rolls in which the roll shaft portion is made of a material with high toughness are often used.

Additionally, if the body wears down to the scrapping diameter or cracks occur, it is uneconomical to discard the entire roll, so a sleeve assembly roll with a replaceable body is also used. .

In other words, a sleeve made of a material suitable for the properties required for the body surface is fired onto a roll shaft made of a strong material, and when the sleeve reaches the scrap diameter, it is discarded and a new sleeve is reassembled and used. Economical.

Generally, the shape of a roll is such that the diameter of the body is large and the diameter of the bearing part is small.If the diameter of the body is 100, then the diameter of the bearing part is 40 to 60%. For rolls, the sleeve assembly method described above can be easily adopted.

however. For example, in the case of the work roll of a four-high rolling mill shown in Fig. 1, there is a neck portion on both sides of the body that does not directly contact the rolled material and has a diameter that is not much different from the body diameter. is 60 to 80 times the diameter of the body, and if only the body is formed of a sleeve, the sleeve will be thin, making it practically impossible to use the sleeve assembly method.

In order to solve this problem, it is sufficient to form the trunk, neck, and, if necessary, the bearing part with a sleeve, which may be integrated or separate. As a result, even for rolls with a small diameter difference between the body and neck, such as work rolls, the sleeve assembly method, in which the sleeve is fixed to the roll shaft by means such as baking, is possible. It is considered possible.

By the way, generally when the sleeve is externally fitted and fixed to the roll shaft by firing, the torque required for rolling is transmitted from the roll shaft to the sleeve by the tightening force of the firing, but in order to increase the transmission torque, It is necessary to increase the firing margin.

Also, since the body sleeve expands due to the heat generated during rolling (particularly during hot rolling), the firing allowance should be made thicker to account for the decrease in firing tightening force due to humidity relaxation. There is a need.

Therefore, in order to always smoothly transmit the necessary torque from the roll shaft.

The firing allowance required for the body sleeve is quite large.

As a result, a large tensile stress is generated in the tangential direction on the inner surface of the body sleeve, and if the strength of the sleeve itself is insufficient, the sleeve will be destroyed. Therefore, strength restrictions are added to the selection of the material for the body sleeve. Ru.

On the other hand, the trunk sleeve inherently has excellent wear resistance due to its intended use.

In other words, it is desirable to use a material with high hardness, but hard materials tend to be inferior in terms of strength, so there is a limit to the selection of a material with excellent wear resistance for the trunk sleeve.

As a countermeasure to this, the body sleeve is made of composite material,
The surface layer of the sleeve can be made of a highly hard, wear-resistant material, and the inner layer can be made of a strong material that can withstand large firing margins, but as mentioned above, the difference between the body diameter and neck diameter of work rolls, etc. It is practically impossible to manufacture such a composite sleeve because of the limitations in increasing the thickness of the sleeve.

In view of this technical background, the present invention devises an assembly structure so that a material with the highest possible wear resistance can be selected for the body sleeve used for rolling.

The torque required for the body sleeve is transmitted through the neck sleeve which is not subjected to rolling, thereby reducing the firing margin of the body sleeve.

Therefore, the feature is that the roll is assembled by fitting and fixing the neck sleeve onto at least one of a body sleeve and a neck portion adjacent to the body sleeve on the roll shaft, and the body sleeve is It is made of a material with excellent wear resistance and heat crack resistance, such as adamite material, and is fired onto the roll shaft with a small firing allowance, while the neck sleeve is made of a strong material such as cast steel or forged steel. ,
It is fixed on the roll shaft via a fixing device, and the opposing portion of the neck sleeve and body sleeve is provided with a convex portion and a concave portion on the latter, and is fitted into the convex concave portion. The structure is such that the two are engaged without being restrained in the radial direction of the shaft, and torque is transmitted from the roll shaft to the trunk sleeve via the neck sleeve.

9. To explain based on the embodiment shown below, FIG. 1 shows a work roll of a four-high rolling mill as an example.

For these rolls with a small difference between the body diameter a and the neck diameter, in order to be able to adopt the sleeve assembly method, that is, to ensure a sufficient sleeve thickness in the body part, it is necessary to It is necessary to form the part and the neck part integrally or with separate sleeves.

That is, in Fig. 9, 1 is a roll shaft with a neck part on one side integrated, 2 is a body sleeve which is directly used for rolling material,
3 is a neck sleeve which is adjacent to the body sleeve and is not subjected to rolling; the inner diameter d of the body sleeve 2 and the inner diameter e of the neck sleeve are slightly larger than the bearing diameter C of the roll shaft 1.

The body sleeve 2 is fixed to the outside of the roll shaft IK by firing.

On the other hand, the neck sleeve 3 is not fired, but is externally fixed to the roll shaft 1 via an appropriate number of fixing devices 4 such as embedded bolts or taper pins, as shown in FIG. 2 or 3.

In the above case, the neck portion on one side is formed integrally with the roll shaft 1, but it is of course possible to form the neck portions on both sides with sleeves.

However, from the viewpoint of economy and workability, it is more advantageous to integrate the neck portion on one side with the roll shaft 1 as described above.

The firing margin of the body sleeve 2 is set to be small.

In other words, the body sleeve 2 does not transmit all of the torque required for rolling by the firing tightening force of the body sleeve 2 itself, but some or all of the torque required for rolling is transmitted from the adjacent neck sleeve 3. The neck sleeve 3 and body sleeve 2 are engaged with each other at their abutting portions in order to transmit the transmission.

To explain this in detail, in FIG. 2 or 3, the neck sleeve 3 is in close contact with the end surface of the body sleeve, and an appropriate number of pieces are attached to the end surface of the neck sleeve 3 on the side of the body sleeve 2. A convex portion 5 is provided, and a concave portion 6 is provided on the end surface of the trunk sleeve 2 in correspondence with the convex portion 5.
The protrusion 5 is fitted into the recess 5, and both sleeves 2 and 3 are engaged so that the torque can be transmitted from the neck sleeve 3 to the body sleeve 2K.

At this time, the above-mentioned uneven fitting needs to be designed so that the trunk sleeve 2 does not restrict the neck sleeve 3 in the radial direction of the shaft.

That is, since the sleeve 2 is fired, the recess 6 needs to have a margin in the radial direction so that there is no problem even if the sleeve 2 contracts in the radial direction.

Further, the height of the convex portion 5 and the depth of the concave portion 6 must be set so as to provide a sufficient engagement area to transmit torque smoothly.

Furthermore, as will be described later, since the neck sleeve 3 is made of a strong material and the body sleeve 2 is made of a wear-resistant material, it is best to provide the convex portion 5 on the neck sleeve 3 in terms of strength. is necessary.

Furthermore. In order to further improve torque transmission in the engagement between the neck sleeve 3 and the body sleeve 2.

It is also possible to use appropriate means such as adding an adhesive to the bonding surface, providing unevenness with shot, and adding metal powder.

In this way, the body sleeve 2 and the neck sleeve 3 are engaged with each other so that part or all of the torque required for the body sleeve 2 during rolling can be transmitted through the neck sleeve 3. , it is possible to reduce the firing tightening force of the body sleeve 2, in other words, it is possible to reduce the firing margin.

Therefore, the tensile stress generated on the inner surface of the body sleeve 2 is reduced, and together with the thickening of the sleeve 2 due to improvements in the assembly structure, the restrictions on the strength of the material of the body sleeve 2 are relaxed.1 For example, it is possible to select a material with excellent wear resistance and heat cracking resistance, such as adamite material.

On the other hand, the neck sleeve 3 is firmly fixed to the roll shaft 1 via a fixing device 4 such as an embedded bolt in order to transmit the torque of the trunk sleeve 2K) and to obtain the thrust prevention effect of the trunk sleeve 2. Must therefore be cast steel.

It is made of strong material such as forged steel.

Next, FIG. 4 shows another embodiment, in this case.

The body sleeve 2 is made thicker, and the body sleeve 2 is made thicker.
In order to extend the life of the body sleeve 2. Neck sleeve 3. This shows the case where a bearing sleeve 7 is provided, and the inner diameter d of the trunk sleeve 2 and the inner diameter e of the neck sleeve 7 are smaller than the outer diameter C of the bearing sleeve 7.

In this embodiment, as in the previous embodiment, both sleeves 2 and 3 may be engaged (not shown) so that the torque is transmitted from the neck sleeve 3 to the trunk sleeve 2K.

Further, the bearing sleeve 7 is thin.

Like the neck sleeve 3, it may be made of a strong material and fixed to the roll shaft 1 via firing or a fixture 4.

In this case as well, the body sleeve 2 can be made of a material such as adamite that has excellent wear resistance and heat cracking resistance.
The neck sleeve 3 is made of a strong material.

In the assembled roll according to the present invention, in order to fix the neck sleeve 3 to the roll shaft 1 via a fixing device 4 such as an embedded bolt, rather than by firing, the neck sleeve 3 is fixed by firing. In addition, when replacing the trunk sleeve 2, the installation and removal work is easy, and the same neck sleeve 3 and fixture 4 can be used repeatedly over a long period of time, making it highly economical. It is something that

In addition, it is also possible to provide an engaging portion for torque transmission at the joint between the neck portion and body sleeve 2 on the opposite side which are integrated with the roll shaft 1 in FIG. Accordingly, the gist of the present invention can be doubled.

In the assembled roll according to the present invention, the neck sleeve 3 is fixed via the fixture 4 as described above.
It should be noted that baking means may also be used to further securely fix the neck sleeve 3.

As described in detail above, the present invention relates to a roll having a shape that makes it difficult to adopt the sleeve assembly method.

Since the roll is constructed by incorporating a sleeve into the neck part as well as the body part, the wall thickness of the body part sleeve can be increased, and at this time, torque can be transmitted from the neck part sleeve to the body part sleeve. Since the two were engaged with each other, it was possible to reduce the firing margin of the body sleeve.

Therefore, the risk of sleeve breakage during rolling is reduced, and the body sleeve can be made of a material with excellent wear resistance and heat cracking resistance, which can greatly improve the life of the sleeve. .

Also, because the neck sleeve was fixed via a fixing device,
The sleeve and fixture can be used semi-permanently, and the roll assembly process has been greatly improved.

In this way, if the present invention is applied to an assembly roll for rolling.

This method has the effect of improving the economy, life span, and assembly workability of the roll as a whole, and is particularly effective in rolls having a small difference between the body diameter and neck diameter mentioned at the beginning.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a work roll according to the present invention,
Figures 2 and 3 are enlarged views of the same main parts. FIG. 2 (■) is a view taken along the line A-A of the second drawing, and FIG. 4 is a side cross-sectional view of a main part of another embodiment according to the present invention. DESCRIPTION OF SYMBOLS 1... Roll shaft, 2... Torso sleeve, 3... Neck part sleeve, 4... Fixing tool, 5... Convex part, 6...
・Concavity. 7... Bearing sleeve.

Claims (1)

[Scope of Claims] 1. A roll assembled on a roll shaft by externally fitting and fixing a neck sleeve onto at least one of a body sleeve and a neck portion adjacent to the body sleeve. The body sleeve is made of a material with excellent wear resistance and heat cracking resistance, such as adamite, and is fired onto the roll shaft with a small firing allowance, while the neck sleeve is made of a strong material such as cast steel or forged steel. It is formed and fixed on the roll shaft via a fixture. Further, in the opposing portions of the neck sleeve and body sleeve, a convex portion is provided on the former and a concave portion is provided on the latter, and the convex portion is fitted into the concave portion to engage the two without being constrained in the axial and radial direction. An assembly roll for rolling, characterized in that torque is transmitted from the roll shaft to the body sleeve via the neck sleeve.