JPH064167B2 - Thrust force detection device for work roll of rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended to detect an axial force, that is, a thrust force in a work roll, which is adjacent to a driving roll of a rolling mill and rolls a steel strip to be rolled. The present invention relates to a thrust force detecting device for a work roll of a rolling mill.

[Prior Art] Generally, in a rolling mill, as shown in FIG. 5, a steel strip 1 to be rolled has at least one roller 2 having a driving force,
The upper and lower work rolls 4 and 5 respectively adjacent to 3 are rolled in the right direction.

In this case, for example, when the lower roll 3 and the work roll 5 adjacent to the lower roll 3 are viewed in plan (see FIG. 1) and their axial directions are not parallel and coincide with each other, or If the axial direction of the roll 5 and the direction perpendicular to the rolling direction of the rolled steel strip 1 are not parallel, the friction of the surface of the work roll 5 is significant (this is also true for the upper roll 2 and the work roll 4). As a result, especially the upper and lower work rolls 4,
If there is a difference in wear between No. 5 and No. 5, the rolled steel strip 1 will be warped.

Therefore, conventionally, a thin steel strip is inserted between the bearings (not shown) of the work rolls 4 and 5 and the housing 6, or a parallelism adjusting device is attached to the bearings of the work rolls 4 and 5. Then, the parallelism was adjusted.

[Problems to be solved by the invention] However, in any of the above methods, the parallelism is adjusted by actually performing the rolling work, observing the wear of the work rolls caused by the rolling work, and experiencing the deviation of the parallelism from the state. We made an analogy and made adjustments. This is a measure because even a slight deviation in parallelism has a large effect, but it is very difficult to detect a minute angle.Therefore, it is necessary to wait until the work roll wears, which requires time and adjustment. It had the drawback of being late in timing.

[Means for Solving the Problem] Therefore, in the present invention, thrust force is generated in the work rolls 4 and 5 due to the deviation of the parallelism instead of empirically detecting the parallelism depending on the degree of wear. Focusing attention, I tried to detect this thrust force. For example, a fixed bearing portion 7 that does not move in the thrust direction is attached to the shaft 5a (see FIG. 1) of one of the work rolls 5, and a load cell 8 whose one end 8a is locked is provided in the recess portion 7a of the bearing portion 7. It was installed to detect the thrust force.

[Operation] When the axial direction of the work roll 5 is not parallel to the axial direction of the roll 3 or the direction perpendicular to the rolling direction when viewed in a plan view (see FIG. 1), the work roll 5 and the roll 3 are separated from each other. Between the work rolls 5 and the steel strip 1 to be rolled, a thrust force as a component force is generated in the work rolls 5 by the frictional force. Therefore, the bearing portion 7 fixed in the axial direction to the shaft 5a is also the same. If a load cell 8 having one end 8a locked is disposed on the bearing portion 7, a strain gauge (not shown) bonded to the load cell 8 is distorted and the thrust force can be detected.

[Examples] Hereinafter, the present invention will be described with reference to the drawings, but the same reference numerals are used for parts having the same functions.

FIG. 1 is an explanatory view showing the basic principle of the present invention, in which a lower roll 3, a lower roll 5 and a steel strip 1 to be rolled are shown. Then, a fixed bearing portion 7 that does not move in the axial direction is attached to the shaft 5a of the work roll 5, and a load cell 8 to which a strain gauge (not shown) is adhered is provided in a concave portion 7a formed on the peripheral surface thereof. One end 8a is locked. Needless to say, the thrust force may be detected by using the upper work roll 4 (see FIG. 5).

Now, as shown exaggeratedly in FIG. 1, the rolled steel strip 1
If the direction orthogonal to (or the axial direction of the roll 3) does not match the axial direction of the work roll 5 in parallel, in the illustrated state in which the right side is lifted, the component force due to frictional force is applied to the work roll 5 in the right direction. Thrust force is generated. When the angle formed by the axial direction of the work roll 5 and the direction perpendicular to the rolling direction on the plan view (see FIG. 1), that is, the skew angle is θ,
The relationship between the skew angle and the thrust force is a curve as shown in the graph of FIG. Here, it should be noted that a considerable amount of thrust force is generated even with a slight skew angle θ.

Therefore, as the actual parallelism adjusting work, the rolled steel strip 1
For example, the tip end of several tens of meters may be rolled at a rolling speed of about 100 meters / minute, and the position of the bearing portion 7 may be adjusted so that the thrust force becomes zero while detecting the thrust force at this time with the load cell 8. , This adjustment is at most 2-3
It ends in minutes.

Although the bearing 7 is attached to the tip of the shaft 5a of the work roll 5, the periphery of the tip is usually restricted in place in many cases, and the space in the radial direction is generally small. It is difficult, but it is relatively easy to take in the axial direction. Therefore, for example, with the configuration shown in FIG. 3, the vertically long load cell 10 can be arranged inside the bearing housing 9. In this case, the concave portions 7a, 7a of the bearing portion 7 can be arranged.
It is preferable to use two inverted L-shaped load cells whose one ends 10a and 10a are locked to each other.

FIG. 4 shows a specific example of the load cell 10, which is composed of a horizontal portion 11 and a vertical portion 12. A pair of upper and lower semi-cylindrical recesses 11a and 11b are formed at the tip of the horizontal portion 11, and load bosses 13a and 13b are attached to the recesses 11a and 13b. The load buttons 13a and 13b are mounted on the bearing portion. 7 is engaged with the concave portion 7a formed in 7, and the bending of the horizontal portion 11 is caused by the holes 11c-1.
It is detected by a strain gauge (not shown) adhered to the inner peripheral surface of 1e.

Further, a screw hole 12a is provided on the front surface of the vertical portion 12 so that the load cell 10 can be reliably fixed by utilizing the rear surface convex portion 12b fitted into the concave portion 9a of the bearing housing 9.

[Advantages of the Invention] The present invention detects the thrust force of the work roll instead of empirically determining the parallelism between the work roll and the adjacent roll due to abnormal wear of the work roll.
The parallelism can be adjusted economically and in a short time.

[Brief description of drawings]

FIG. 1 is a principle explanatory view showing a basic principle of the present invention, FIG. 2 is a graph showing a relationship between a skew angle and a thrust force, and FIG. 3 is an enlarged sectional view of an essential part of an embodiment applying the same principle. FIG. 4 is an enlarged perspective view of the load cell used in the embodiment,
FIG. 5 is a schematic explanatory view of a general rolling mill. 1 ... Rolled steel strip, 2, 3 ... Rolls, 4, 5 ... Work rolls, 5a ... Shaft, 6, ... Bearing housing, 9 ...
Housing, 7 ... Bearing, 7a ... Recess, 8, 10
Load cell, 8a One end, 11 Horizontal part, 12
Vertical part, 13 Load button.

Claims (1)

[Claims] 1. A bearing unit, the thrust direction of which is fixed to the shaft of a work roll in a rolling mill, is installed, and one end of a load cell for measuring force is locked by this bearing unit. Thrust force detection device for work rolls of rolling mills that detects thrust force, which is the force.