JPH0631317A - Rolling equipment - Google Patents

Abstract

PURPOSE:To provide a rolling equipment which can raise loading capacities of a radial bearing and a thrust bearing even at a low speed and to obtain a satisfactory thrust loading capacity in a cross mill a s well. CONSTITUTION:A bearing to support a rolling roll 1 consists of a statical radial bearing 27 and a statical thrust bearing 31, high pressure lubricant is supplied from a high pressure lubricant feeder 32 to the respective bearings to form lubricating films. In this way, irrespective of the rotational speed of the roll, either the radial bearing or the thrust bearing can obtain a large loading capacity at a low speed. Further, in case of a cross mill, an adjusting valve 37 for a thrust bearing is controlled by a controller 41 in accordance with the supply, pressure, etc., of the high pressure lubricant supplied to the statical thrust bearing 31 to cope with a large thrust load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of rolling equipment, which is intended to increase the load capacity of a bearing supporting rolling rolls in a low speed range and to cope with a large thrust load by a roll cloth. It is a thing.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for rolling under high pressure and improvement in dimensional accuracy in the rolling process used for manufacturing sheet materials, and rolling facilities have been improved.

For example, as for the roll bearings supporting both ends of the rolling rolls, the radial bearings and thrust bearings are required to have a large load capacity because of the rolling under high pressure.

For example, as shown in FIG. 2 of Japanese Unexamined Patent Publication (Kokai) No. 58-20306, a roll shaft portion 2 having a taper portion and a small diameter portion is formed at both ends of a roll body portion 1 to form a taper. While the sleeve 4 is fitted to the portion via the key 3, the bearing bush 7 is fixed to the inner circumference of the bearing box 5 with the fixing pin 6.
Is attached to form a radial journal bearing 8, which serves as a dynamic pressure bearing that supports a load with a lubricating film formed by rotation. Further, the inner race 10 of the thrust rolling bearing 9 is fitted to the small diameter portion of the roll shaft portion 2, and the outer race is fixed to the bearing box 5 via the fixing member 11. In the figure, 12 and 13 are upper and lower work rolls, and W is a rolled material.

[0005]

When such a radial journal bearing 9 of dynamic pressure lubrication is used as a bearing for a rolling roll, the formation of the lubricating film is affected by the rotational speed of the rolling roll, and when the rolling speed is low, the formation of the lubricating film is affected. There is a problem that the load capacity is small.

Further, even when the thrust bearing is constituted by the rolling bearing, the load capacity is small, and in particular, the upper and lower work rolls which have recently been put into practical use as rolling equipment capable of controlling the sectional shape of rolled products with high accuracy Let it cross
In the case of a cross mill in which the clearance distribution between rolls is changed, the thrust force generated is large, and a larger load capacity is required.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a rolling facility capable of increasing the load capacity of the radial bearing and the thrust bearing even in a low speed range.

Further, the present invention is intended to provide a rolling mill having sufficient thrust load capability even in a cross mill that crosses work rolls and the like and capable of coping with the case where the bearing load changes due to the cross angle or rolling force. Is.

[0009]

In order to solve the problems of the above-mentioned prior art, the rolling equipment of the present invention comprises a bearing for supporting the roll end portion of the rolling equipment, comprising a static radial bearing and a static thrust bearing. It is characterized in that one high pressure lubricating oil supply device is provided for branching and supplying high pressure lubricating oil to these two hydrostatic bearings.

Further, in addition to the structure of the first invention, the rolling equipment of the present invention allows only the upper and lower work rolls of the rolls of the rolling equipment to cross each other in a horizontal plane, and the roll end portions of this rolling equipment A control device for controlling the high-pressure lubricating oil to be supplied to the hydrostatic thrust bearing that supports the bearing by means of a cross angle and a rolling load is provided.

[0011]

According to this rolling facility, the bearings supporting the rolling rolls are composed of the static pressure radial bearings and the static pressure thrust bearings, and the high pressure lubricating oil is supplied to each bearing from one high pressure lubricating oil supply device. To form a lubricating film,
Regardless of the roll rotation speed, both the radial bearing and the thrust bearing can obtain a large load capacity in the low speed range.

Further, according to this rolling facility, in the case of a cross mill that crosses work rolls and the like, the generated thrust force is large, but the supply amount of high-pressure lubricating oil to be supplied to the hydrostatic thrust bearing of the first aspect of the invention. The control device controls the pressure, pressure, etc. based on the cross angle, rolling load, etc., so that a large thrust load can be sufficiently dealt with.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic cross-sectional view and a partially enlarged view of an embodiment in which the rolling equipment of the present invention is applied to a lower roll of a four-high rolling mill. In this rolling equipment 20, a roll shaft portion 2 having a taper portion and a small diameter portion is formed at both ends of a roll body portion 1 of a lower backing roll, and the outer periphery is formed into a cylindrical shape via a key 21 at the taper portion. At the same time, the sleeve 23 having the thrust rib portion 22 protruding outward through the small diameter portion is fitted at the tip thereof, while the bearing bush 25 is attached and fixed to the inner circumference of the bearing box 24. It is attached by a pin 26 and constitutes a hydrostatic radial bearing 27.

An inner thrust ring 28 and an outer thrust ring 29 are mounted on both side surfaces of the flange portion 22 of the sleeve 23 and are held by an adjusting ring 30 to form a hydrostatic thrust bearing 31.

Then, one high-pressure lubricating oil supply device 32 is installed to supply high-pressure lubricating oil to the static-pressure radial 27 and the static-pressure thrust bearing 31 to perform static-pressure lubrication, and the lubricating oil is supplied from the lubricating-oil tank 33. The pump 34 supplies pressure, and supplies high-pressure lubricating oil between the sleeve 23 and the bearing bush 25 from the lubricating oil supply port 36 via the radial bearing adjusting valve 35, and also adjusts the thrust bearing adjusting valve. High pressure lubricating oil is supplied from the two lubricating oil supply ports 38 and 39 to the brim portion 22 and the inner thrust ring 28 and between the brim portion 22 and the outer thrust ring 29 to perform hydrostatic lubrication. I am doing it.

The static pressure radial bearing 27 and the static pressure thrust bearing 31 are provided, and a single high pressure lubricating oil supply device 32 is provided.
Unlike the radial journal bearings and rolling bearings that perform dynamic pressure lubrication, the rolling equipment 20 that supplies lubricating oil forms a lubricating film with the lubricating oil supplied from the high-pressure lubricating oil supply device 32 even when the roll rotates at a low speed. You can
A large load capacity can be ensured, and the load capacity can be changed by adjusting the pressure of the supplied lubricating oil.

Further, in this rolling facility 20, since the thrust bearing is also composed of the hydrostatic thrust bearing 31, the original load capacity can be increased as compared with the case of the rolling bearing.

Further, since the high-pressure lubricating oil for static pressure lubrication is branched and supplied by one high-pressure lubricating oil supply device 32, the lubricating oil supply system can be simplified.

Next, the rolling equipment of the embodiment applied to the cross roll mill will be described with reference to FIG. 1, but the same parts as those of the rolling equipment 20 will be denoted by the same reference numerals and the description thereof will be omitted.

The rolling equipment 40 is composed of a work roll cross mill that crosses the rotation axes of the upper and lower work rolls 12 and 13 with respect to the direction perpendicular to the line in the horizontal plane. In the rolling equipment 40 constituted by this work roll cross mill which is equipped with a cross mechanism so as to be capable of crossing, the upper and lower work rolls 12 and 13 and the upper and lower work rolls supporting the work rolls 12 and 13 are accompanied by the roll cloth. Since the thrust force is also generated in the rolls, the static pressure radial bearing 27 and the static pressure thrust bearing 31 having the same configuration as described above are provided at the ends of each roll.

In the rolling equipment 40, a control device 41 is connected to the thrust bearing adjusting valve 37, and a cross angle detector (not shown) or a cross angle from a rolling load detector, which is input to the control device 41, is supplied. The rolling load controls the supply amount and supply pressure of the high-pressure lubricating oil supplied to the hydrostatic thrust bearing 31 via the thrust bearing adjusting valve 37.

Further, the control by the control device 41 is performed by the control device 41 when the cross angle becomes large and the thrust force becomes large, or when the rolling load becomes large and the thrust force becomes large. A signal for increasing the supply amount of the lubricating oil or a signal for increasing the supply pressure is output to 37 to control so as to increase the load capacity of the hydrostatic thrust bearing 31.

By doing so, even if the thrust force applied to the rolling roll is increased, it is possible to easily secure the load capacity capable of supporting the thrust force.

In this case, the relationship between the supply amount or supply pressure of the lubricating oil and the cross angle or rolling load is not a simple proportional relationship, but an appropriate amount or an appropriate amount can be obtained by using a function determined in advance by experiments or the like. Supply with pressure.

Excessive accumulation of lubricating oil in the static pressure radial bearings and static pressure thrust bearings also has an adverse effect on the rolling operation. To be collected.

Further, in the above-mentioned embodiment, the case where the rolling equipment is applied to the four-high rolling mill has been described, but the present invention is not limited to this, and it can be applied to a multi-high rolling mill such as a six-high rolling mill.

Further, each constituent element may be modified within the scope of the invention.

[0028]

As described above in detail with reference to the embodiments, according to the rolling equipment of the present invention, the bearing for supporting the rolling roll is composed of the static pressure radial bearing and the static pressure thrust bearing, and High-pressure lubricating oil is supplied from the high-pressure lubricating oil supply device to each bearing to form a lubricating film, so regardless of roll rotation speed, both radial and thrust bearings have a large load capacity in the low speed range. And the high pressure lubricating oil supply device is
Since it is provided as a stand, the oil circulation system can be simplified.

Further, according to this rolling facility, in the case of a cross mill that crosses work rolls and the like, the supply amount and pressure of the high pressure lubricating oil to be supplied to the hydrostatic thrust bearing of the first aspect of the invention are controlled by the cross angle and rolling. Since the control device is controlled based on the load and the like, even if the thrust force generated due to the roll cloth increases, a lubricating film corresponding to this can be formed to obtain a sufficient thrust load.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view and a partially enlarged view of an embodiment in which the rolling equipment of the present invention is applied to a lower roll of a four-high rolling mill.

FIG. 2 is a schematic sectional view of a conventional rolling facility.

[Explanation of symbols]

 1 Roll Body 2 Roll Shafts 12 and 13 Upper and Lower Work Rolls 20 Rolling Equipment 21 Keys 22 Collars 23 Sleeves 24 Bearing Boxes 25 Bearing Bushings 26 Fixing Pins 27 Static Pressure Radial Bearings 28 Inner Thrust Rings 29 Outer Thrust Rings 30 Adjusting Rings 31 Hydrostatic thrust bearing 32 High-pressure lubricating oil supply device 33 Lubricating oil tank 34 Lubricating oil pump 35 Adjusting valve for radial bearing 36 Lubricating oil supply port 37 Adjusting valve for thrust bearing 38, 39 Lubricating oil supply port 40 Rolling equipment 41 Control device W rolling Material

Claims (2)

[Claims] 1. A bearing for supporting a roll end of a rolling facility comprises a hydrostatic radial bearing and a hydrostatic thrust bearing, and one high-pressure lubrication system branches and supplies high-pressure lubricating oil to these two hydrostatic bearings. A rolling facility equipped with an oil supply device. 2. Among the rolls of the rolling equipment, only the upper and lower work rolls can cross each other in a horizontal plane, and the high-pressure lubricating oil supplied to the hydrostatic thrust bearing supporting the roll end portion of the rolling equipment has a cross angle. The rolling equipment according to claim 1, further comprising a control device for controlling the rolling load according to the rolling load.