JPS5850115A - Detection for temperature of divided type back-up roll for multistage cluster rolling mill - Google Patents

Abstract

PURPOSE:To prevent the galling phenomena in the collar parts of inner races and to prolong the time intervals for overhauling by providing cylindrical rollers in the rotating parts of divided type backup rolls, burying temp. detectors therein and detecting temps. automatically thereby controlling operating conditions. CONSTITUTION:In back-up rolls for divided type multistage cluster rolling mills, temp. detectors 22 such as thermocouples are buried in both side surfaces part on the outer sides in the collar parts 21a of inner races 21 of revolving bearings using cylindrical rollers 20 or tapered rollers. The frictional heat generated in the side end faces of the rollers 20 and the parts 21a by thrust load during rolling is detected automatically. The rise in the temps. is detected and is converted to an electric signal with an amplifier 23. The temp. at the maximum operatable revolving speed is set and operating conditions such as rotating speeds, roller screw down forces, the discharge rate of cooling oil to be discharged for the purpose of preventing heating of back-up rolls and the like are controlled in accordance with said set temp., whereby the normal operation at the max. permissible revolutions is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION In recent years, the speed of rolling mills has been gradually increased from the viewpoint of improving productivity and saving energy, and high-reduction rolling mills are required as efficient rolling mills.

There is a multistage cluster type rolling mill that enables this cold rolling under high pressure. Such a multistage cluster type rolling mill has the advantage that the diameter of the work roll can be made small, so the rolling load is small, and high rolling reduction is possible. It is known that the shape of the rolled material becomes defective, and as shown in FIG. By relatively changing the position of the axis, that is, by making the reinforcing roll into a split type and rotating each of these split reinforcing rolls 01 through an eccentric wheel 03 fitted to the central shaft 02, the results shown in FIGS. As shown in Fig. 6, the intermediate roll 04 and work roll D5, which are extruded in a convex shape with respect to the work roll and are bent by the rolling load, are bent in the opposite direction by the reinforcing roll 01 to obtain a flat rolled material with uniform wall thickness. The technology that attempts to do this is being adopted.

In such split reinforcing rolls, bearings using cylindrical rollers or full weight rollers in one rotation part are mainstream.

The biggest drawback in this case is that there is no structurally effective lubrication method for the pressure surface in contact with the collar side end surface of the inner ring of the roller bearing (frictional heat is generated on the contact pressure surface due to the thrust load during rolling). However, this temperature rise causes galling, which significantly shortens the life of the bearing.
Anti-friction agents are applied or baked on the bearing inner ring protrusion and the roller side end face to prevent galling in these areas, but these methods are not sufficient to prevent galling, and may occur in a short period of time. It is necessary to disassemble it for maintenance.

Maintenance and inspection require a lot of effort and cost.

In addition, it has become a major bottleneck in increasing the operating speed of rolling mills in order to increase their efficiency.

The present invention improves the fire point of the conventional multi-stage cluster rolling mill as described above, takes advantage of the characteristics of the split-type reinforcing roll with adjustable crown, and uses the reinforcing roll in the rotating part of the 110-roll. It prevents the galling phenomenon caused by the thrust load between the side end surface of the cylindrical roller or tapered roller and the inner ring collar, thereby extending the life of the reinforcing roll bearing as much as possible, making it possible to increase the speed of the rolling mill, and improve efficiency. This was proposed for the purpose of measuring temperature, and a temperature sensor such as a thermocouple is embedded in the inner ring collar that comes into contact with the end of the cylindrical or tapered roller used in the rotating part of the split reinforcing roll.
The temperature of the frictional heat generated by the thrust load during operation is automatically detected, and various operating conditions such as the rotation speed of the rolling mill, the roller reduction blade, and the amount of cooling oil mist discharged to the reinforcing roll are controlled. The present invention relates to a method for detecting the temperature of a split reinforcing roll that enables maximum efficient operation.

Hereinafter, one aspect of the present invention will be specifically explained with reference to FIGS. 4 and 5.

In FIG. 4, the outline of the multi-stage cluster rolling mill will be explained. A rolling material 1 moves in the direction of an arrow and is rolled.

2 is a pair of upper and lower work rolls, and 3 is an intermediate roll.

4 is a reinforcing roll, 5 is a metal chock of the same reinforcing roll, and the bearing part of the fixed shaft 5a is in the form of a half, and the fixed shaft 5a is held by a bearing part flange 5b.

Reference numeral 6 indicates a support frame for the metal chock, and 7 indicates a metal chock for the intermediate roll, which allows the intermediate rolls 3 of a pair of upper and lower work rolls to be displaced symmetrically with respect to a vertical plane passing through the axes of the upper and lower work rolls 2. ing.

8 is the metal chock of the work roll, 9 is the reduction device, 1
0 is the housing. 11 is a hydraulic cylinder for applying a pending force to the work roll 2, 12 and 13 is a hydraulic cylinder for applying a pending force to the intermediate roll, and 14 is a hydraulic cylinder for lifting the reinforcing roll metal chock 5. Further, the reinforcing roll 4 is divided into a plurality of parts in the axial direction of the fixed shaft 5a, and the bearing eccentric wheel 15 of each reinforcing roll 4 is eccentric with respect to the axial center of the fixed shaft 5a, and is not shown. Adjustment device allows eccentric wheel 1
By turning 5, each reinforcing roll 4 can be adjusted individually, and the crown of the reinforcing roll as a whole can be adjusted as shown in FIG.

In the reinforcing roll of the split type multi-stage cluster rolling mill constructed in this manner, as shown in FIG.
Thermocouple equal temperature detectors 22 are embedded in both outer sides of the collar 21a of the inner ring 21 of a rotary bearing using zero or tapered rollers (this figure shows the case of cylindrical rollers). The collar portion 21a automatically detects the frictional heat generated by the thrust load during rolling.

Normally, as the rotational speed of the reinforcing roll increases, the temperature of the inner ring collar rises, and when the rotational speed reaches around 1000 rotations as shown in Figure 6, the inner ring shoulder and roller side end face locally generate heat. It becomes hot and galling occurs, making it impossible to rotate. The present invention detects such a temperature rise, converts it into an electrical signal using the amplifier 23, and sets the temperature at the maximum operating speed in advance. The purpose is to provide an efficient rolling mill that can constantly operate at the maximum permissible rotation by controlling various operating conditions such as rotational speed, roller reduction blades, and the amount of cooling oil discharged to prevent heat generation of the reinforcing roll. be.

It is impossible to completely eliminate the galling phenomenon at the inner ring collar of reinforcing rolls using only the method of discharging cooling oil to the inner ring collar of the reinforcing roll used in conventional rolling mills. It cannot be expected to improve efficiency much.

However, according to the method for detecting the temperature of the inner ring collar according to the present invention, galling of the inner ring collar can be completely prevented, the period for disassembly and maintenance can be significantly extended, and this can greatly contribute to improving the efficiency of the rolling mill. In addition, since the life of the bearing part is extended, maintenance such as disassembly is easy, and costs can be significantly reduced.

In addition, since the operating speed of the rolling mill can be maximized and increased, it has various advantages such as efficient operation, and has greatly contributed to the industry.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a split reinforcing roll of a conventional multi-stage cluster rolling mill, FIGS. 2 and 3 are explanatory diagrams of its operation mode, and FIGS. 4 and 5 are illustrations of an embodiment of the present invention. Fig. 4 is a side view, Fig. 5 is an explanatory diagram showing the relationship between the reinforcing roll and the temperature sensor, and Fig. 6 is a diagram showing the relationship between the rotation speed of the reinforcing roll and the temperature of the collar. It is a graph. In FIGS. 4 and 5. 1: Rolled material, 2: Biwer roll, 3: Intermediate roll, 4: Reinforcement roll, 5: Metal chock. 6: Support frame +' 7 II metal chock. 8: Metal chock, 9: Reducing device, 10: Housing, 11, 12, 13, 14: Hydraulic cylinder, 15: Eccentric wheel, 22: Temperature detector. Successor, patent attorney Teru Ito (2 others) Horse 6 figures 600 800 7000 Over 1200m Row I
L rotation speed (RPM)

Claims (1)

[Claims] In a multi-stage cluster rolling mill having split reinforcing rolls, a cylindrical roller or a tapered roller is used in the rotating part of the reinforcing roll, and a temperature sensor such as a thermocouple is embedded in the inner ring collar in contact with the side end surface of the roller, and a temperature sensor such as a thermocouple is embedded during rolling. The temperature of the inner ring collar caused by the thrust load of the engine is automatically detected and various operating conditions such as one rotational speed are controlled so that the engine is operated at a temperature below the allowable temperature to prevent seizure. Temperature detection method for split reinforcing rolls.