JPH07100508A - High precision rolling method and apparatus therefor - Google Patents

Abstract

PURPOSE:To roll an outer ring as an stable condition of the rotation of a roll axis is held and to improve the rolling precision by giving a pre-load to the outer ring of a roller bearing of a roll bearing from the direction of a right angle to the surface of a rolling material, deforming this outer ring elastically and removing the axial a gap of this part. CONSTITUTION:Since the pre-load is given to the outer rings 4a, 4b, 4c of the roller bearings 3a, 3b, 3c from the direction of a right angle to the surface of the rolling material to deform the outer rings elastically, the leading property of a compressive strain and a reaction is elevated so that the rotation of the roll axis 2 is stabilized. The pre-load is given by using hydraulic pressure. The roll chocks 5, 5a of the roll bearings of a rolling mill 1 are divided vertically in the central part of the roll axis 2, a fine gap is held in this part, the outer rings 4a, 4b, 4c are installed respectively on every roll bearing arranged in an annular state and a pre-load means is set to give the pre-load to at least one outer ring. The pre-load means is made of a hydraulic device 9. In this way, the gap between the surface to which the pre-load is transmitted and the roller bearing becomes zero substantially.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention aims to obtain a high precision (for example, ± 0.001 mm) when rolling a new material (for example, a material having an oxide layer on one or both sides of a metal plate). High precision rolling method and device.

[0002]

2. Description of the Related Art A conventionally known two-stage roll (or four-stage roll backup roll) is, as shown in FIG.
Rollers 1, 1a have shafts 2, 2a and roller bearings 3
The outer ring 4 and the outer ring 4 are fitted and supported by the roll chock 5, 5a, and the hydraulic cylinders 9, 9 are provided on the roll chock 5a side.
Is set vertically to support the roll chock 5.
Further, the lower end of the reduction screw 15 is in contact with the upper portion of the roll chock 5.

[0003]

Recently, in various kinds of metal rolling, a method suitable for each type of rolling material has been developed. One or both surfaces of a thin metal plate in a new material is coated with oxide powder. High-precision rolling (for example, ± 0.001 mm) has a problem in that it is difficult to roll flat ultra-thin bands.

Regarding the rolling of the new material, a small value of 1 digit or less per 1 cm width (for example, 1/10 to 1/30), and weak rolling (actually compression) are stably required. For example, when rolling a general metal sheet, rolling is performed at a rolling load of 90 tons to 180 tons for a width of 300 mm, so the above value is extremely small.

In the weak rolling as described above, the compression amount in one pass roll may be about 10 microns. Then, since the rolling load is further reduced, the stability in the roller bearing of the roll shaft becomes extremely poor. That is, the rolling load fluctuates due to the nature of the material, so the X in the roller bearing is changed.
The unstable position change of the roll position in the axial direction makes it difficult to maintain the accuracy of ± 0.001 mm with respect to the rolled (compressed) product thickness.

Further, when the rolling material 13 is the intermittently coated oxide layer 14 as shown in FIG. 6, the chock is subjected to a force in the direction in which the roll axis moves below the Y axis shown in FIG. The product thickness in the vicinity of the intermittent coating part is disturbed on the other hand, and the ratio of the increase of the reaction force to the variation of this thickness (that is, the rigidity of the rolling mill) is required to be large. .

[0007]

[Means for Solving the Problems] In the above-mentioned new material, unlike ordinary metal rolling, by pressing a layer of powder of oxide or the like, the density of the powder is increased and the powder is evenly distributed. There is almost no elongation of the material in the rolling direction, and it is often desired that the thickness be reduced by the amount of oxide compression. In order to achieve the above purpose, the larger the roll diameter, the better.

In order to stably drive the rolling roll, it is more advantageous that the compression strain and the reaction force rising characteristics are higher together with the withstand pressure load in the bearing structure of the roller bearing. Further, it is more advantageous to increase the rigidity at the time of a small rolling load.

According to the present invention, a preload is applied to the outer ring of the roller bearing to bring the roller bearing into close contact by this deformation, the reaction force is increased, the above-mentioned problems are improved, and stable and high precision is achieved regardless of weak rolling. Succeeded in obtaining.

That is, the present invention is a high-precision rolling method characterized in that the outer ring of the roller bearing of the roll bearing is preloaded from the direction perpendicular to the surface of the material to be rolled so that the outer ring is elastically deformed. Further, the preload of another invention is to be applied to the outer ring of the roller bearing at the center of the roll bearing, and the preload is to be applied using hydraulic pressure.

Next, in the invention of the apparatus, the roll chock of the roll bearing of the rolling mill is divided into upper and lower parts at the central part of the roll shaft, a fine gap is maintained in the part, and each roll bearing arranged in an annular shape is respectively The high precision rolling mill is characterized in that an outer ring is mounted and at least one outer ring is provided with a preloading means, and the preloading means is a hydraulic device.

[0012]

According to the present invention, the outer ring of the roller bearing is preloaded from the direction perpendicular to the surface of the material to be rolled to deform the outer ring elastically, so that the roll shaft rotation is kept stable and the compression strain and the reaction force rise. The characteristics are high.

According to the above, since the gap between the roller bearings on the preload transmission surface is practically zero, the precision during rolling is dramatically improved.

[0014]

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

The inner ring 7 is attached to the shafts 2 and 2a of the rolling rolls 1 and 1a.
Through the roller bearings 3a, 3b, 3c and the outer ring 4
a, 4b, 4c are sequentially fitted, and the roller bearings 3a, 3b, 3c are arranged in parallel in three rows in the axial direction, and the inner ring 7 and the outer ring 4a, 4a, 4b are arranged for each roller bearing.
b and 4c are fitted inside and outside, respectively. The outer rings 4a, 4
On the outer sides of b and 4c, roll chocks 5 and 6 on the roll shaft side and roll chocks 5a and 6a corresponding to the above, respectively.
And the central portion 5s of the roll chock 5 and the central portion 5as of the roll chock 5a are divided into
The left and right are separated so that each can move independently. In the above description, the hydraulic cylinders 9, 9 are vertically provided on the roll chock 5a, and the tips of the rods 8, 8 of the hydraulic cylinders 9, 9 are in contact with the roll chock 5a, 5a.

In the above, when pressurized oil is fed to the hydraulic cylinders 6 and 6, the rods 8 and 8 rise as shown by arrows 10 and 10 (FIG. 1), and the roller bearing 3b is added via the outer ring 4b. Since the outer ring 4b is pressed, the outer ring 4b is indicated by arrows 11 and 11 in FIG.
It transforms like.

That is, the roll chock 5a shown in FIG.
By preloading as described above, the gap is practically zero in the pressure transmission system. Therefore, during rolling, the rising characteristics of the load are improved, and the rolling accuracy can be dramatically improved.

By applying a preload of 20% of the total six basic negative allowable loads to the six roller bearings 3a to 3b to 3c in FIG. 1 by the rod 8, the intended effect can be obtained. Obtained.

That is, a layer having a width of 300 mm, which is obtained by applying an oxide to both sides or one side of an aluminum or copper thin plate, 0.16 mm
(± 0.001) was stably obtained.

As a comparison, in FIG. 5, when the chock 5 is pushed up by the rod 8 and rolled, a thickness change of ± 0.003 or more appears at the time of a minute rolling amount, and further, preload outside the roll chock (back pressure crown). For example, when the rod 12) is used, the thickness of the rolled product on the left and right (both sides) becomes uneven, which makes it difficult to adjust the rolling.

[0021]

The rolling accuracy is dramatically improved because the outer ring is pre-pressed by an external force and the rolling is carried out while maintaining the stable condition of the roll shaft rotation.

There is also an effect of improving the rolling stability.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention.

FIG. 2 is a vertical side view of the same.

FIG. 3 is a partial perspective view of a roll chock that is also pressurized.

FIG. 4 is an explanatory view showing the elastic deformation of the outer ring.

FIG. 5 is a partially cut front view of a conventionally used rolling mill.

FIG. 6 is an enlarged perspective view of a rolled material rolled by the present invention.

[Explanation of symbols]

 1, 1a Rolling roll 2, 2a Shaft 3a, 3b, 3c Roller bearing 4a, 4b, 4c Outer ring 5, 5a, 6, 6a Roll chock 7 Inner ring 8 Rod 9 Hydraulic cylinder

Claims (5)

[Claims] 1. An outer ring of a roller bearing of a roll bearing is preloaded from a direction perpendicular to a surface of a rolled material to elastically deform the outer ring, thereby reducing the axial clearance of the portion.
A high-precision rolling method characterized by: 2. The high precision rolling method according to claim 1, wherein the preload is applied to the outer ring of the roller bearing at the central portion of the roll bearing. 3. The high precision rolling method according to claim 1, wherein the preload is applied by utilizing hydraulic pressure. 4. A roll chock of a roll bearing of a rolling mill is divided into upper and lower parts at a central part of a roll shaft, a fine gap is maintained in the part, and each roll bearing arranged annularly,
A high-precision rolling mill characterized by being equipped with an outer ring for each and equipped with a preloading means for applying a preload to at least one outer ring. 5. The high precision rolling apparatus according to claim 4, wherein the preload means is a hydraulic device.