JP3061347B2 - How to adjust the entrance guide pass line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adjusting a pass line of an entrance guide for rolling a rolled material having high dimensional accuracy by accurately adjusting the position of the entrance guide to the pass line.

[0002]

2. Description of the Related Art When an entrance guide is displaced with respect to a pass line, a rolled material is not accurately guided to a rolling roll die, but is rolled in a state of being offset. Therefore, as a method of adjusting a pass line of an entrance guide for preventing offset rolling, a method described in JP-A-6-15334 has been conventionally proposed. In this publication, the reaction force received by each of the guide rollers provided on a pair of roller holders of the entrance guide of the hot rolling of the strip is measured as a load signal, and the guide rollers are so adjusted as to eliminate the difference between the two load signals. A technique is disclosed in which the center of the pass is adjusted to prevent the center of the rolled material from shifting and to eliminate the offset rolling.

[0003]

The conventional method of adjusting the pass line of the entrance guide has the effect of accurately guiding the rolled material to the rolling roll by adjusting the guide roller without misalignment with respect to the pass line. However, there are the following problems. That is, the rolled material at the time of entering the entrance guide arranged on the entrance side (entrance side) of the rolling mill is formed with a loop by the looper arranged between the rolling mills, and is displaced from the pass line. In many cases, the rolled material is shifted from the pass line and enters the guide roller, such as a shift from the pass line with a certain amount of amplitude due to resonance. When the rolled material enters from the pass line in this way, even if the entrance guide is accurately aligned with the pass line, the load applied to the left and right guide rollers of the entrance guide is not uniform, and the load Due to the difference, even if the position of the entrance guide is adjusted so that the load applied to the guide roller is equal, there is a problem that the rolled material cannot always be guided accurately to the hole shape of the rolling mill. .

[0004] An object of the present invention is, for example, when the rolled material enters the entrance guide in a loop by a looper or the like, or when the rolled material resonates with a rolling mill or the like and enters the entrance guide with amplitude. An object of the present invention is to provide an adjustment method for accurately aligning an entrance guide with a position where an error (offset) does not occur in the shape of a rolled material even if the rolled material may deviate from a pass line.

[0005]

SUMMARY OF THE INVENTION A method of adjusting a pass line of an entrance guide according to the present invention measures an outer dimension of a rolled material on an outlet side of a rolling roll, and determines an error between the measured size and a required size of the rolled material. Based on this, the position of the entrance guide disposed on the entrance side of the rolling roll is accurately adjusted to the pass line. In the present invention, a guide shift device for adjusting the position of the entrance guide and a dimension for measuring the outer dimensions of the rolled material for determining whether or not the alignment of the entrance guide is accurately performed. If there is an error in the measured external dimensions of the rolled material, using a measuring device and an arithmetic unit for calculating an error between the measured external dimensions and the required external dimensions, the error is eliminated. Then, the entrance guide is shifted by a guide shift device, and the pass guide is adjusted by centering the entrance guide on a rolling roll.

[0006]

[Function] Even if the rolled material does not deviate from the pass line, if the rolled material does not bite into the rolling roll accurately and the outer dimension of the rolled material is shifted, the rolled material measured by the dimension measuring device is measured. Since there is an error between the external dimensions and the required external dimensions (design external dimensions), the guide shift device calculates the error between the external dimensions of the rolled material measured by the dimension measuring device and the required external dimensions by the arithmetic unit. The pass line adjustment is performed by shifting the entrance guide in a direction in which the error is eliminated.
By quantifying the relationship between the shift amount of the entrance guide and the error in the outer dimensions of the rolled material by the position detector, the error (m
If the characteristics of m) and the shift amount (mm) are obtained, it is possible to calculate in advance in which direction and how much the entrance guide should be shifted with respect to the error obtained by the measurement. Can be shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for adjusting a pass line of an entrance guide according to the present invention will be described with reference to the drawings. In the pass line adjusting method of this example, as shown in FIG. 1, a hydraulic system equipped with a position detector which constitutes a main body of a guide shift device capable of shifting the entrance guide 1 in the axial direction (vertical direction in the drawing) of the rolling roll R is used. A cylinder 2 and a dimension measuring device 3 provided at the exit side of the rolling roll for measuring a cross-sectional shape of a rolled material rolled by the rolling roll.
And an arithmetic unit 4 for calculating an error between the external dimensions of the rolled material measured by the dimension measuring device and required external dimensions (design external dimensions). How to adjust the pass line
A pair of guide rollers 1a, 1 provided on the entrance guide 1.
After the cross-sectional shape of the rolled material guided by a and rolled by the rolling roll R is measured by the dimension measuring device 3, an error between the outer dimensions of the rolled material measured by the dimension measuring device and the required outer dimensions is calculated. The arithmetic unit 4 performs the arithmetic operation, and the arithmetic unit switches the electromagnetic switching valve 5 to expand and contract the ram of the hydraulic cylinder 2, thereby shifting the entrance guide 1 in a direction in which the error of the external dimensions is eliminated (vertical direction in FIG. 1). Perform pass line adjustment.

As the configuration of the dimension measuring device 3, a known one is used. For example, as described in JP-B-61-16004, column 3, lines 2 to 37, the cross-section of the rolled material is measured. Measuring the diameter of various positions in a spiral with a rotary thickness gauge, calculating the cross-sectional area of the rolled material based on the measured value, calculating the difference from the reference cross-sectional area, and measuring it, etc. Use In the guide shift device, the tip of the ram of the hydraulic cylinder 2 is connected to a base provided at the bottom of the entrance guide 1, and the entrance guide moves on the support base in the vertical direction in FIG. It is possible and the position is adjusted through this movement. In FIG. 1, 6
(Shown by a solid line) denotes an electric wire, 7 (shown by a two-dot chain line) denotes a hydraulic line, a hydraulic line 7a is used as a hydraulic source,
b contacts the drains respectively.

With reference to FIG. 2, a method of shifting an entrance guide when an elliptical rolled material is displaced from the center and bites into the rolling roll R will be described by taking elliptical / round rolling as an example.
When the center line CL of the elliptical rolled material OV is misaligned with respect to the pass line PL and bites into the rolling roll R with the misalignment dimension d, the rolled material should have a required round shape after being rolled by the rolling roll. The rolled material RD has a filled part a and a non-filled part b and the like, and an error occurs in the cross-sectional shape. This error is detected by the dimension measuring device 3 and the electromagnetic switching valve is calculated based on the result calculated by the calculating device 4. 5, the entrance guide 1 is shifted in the required direction (left side in the figure) by the center deviation dimension d to perform accurate centering.

Further, the relationship between the error in the cross-sectional shape and the shift amount is quantified as the shift amount with respect to the dimensional error or the relationship between the shift amount with respect to the dimensional error area calculated based on the dimensional error, and the shift amount with respect to the error (mm). If the characteristic as (mm) is obtained, the shift direction and the amount of movement of the entrance guide are calculated by prediction with respect to the error, and the hydraulic cylinder may be driven. There is also a method of shortening the operation cycle to be shifted and performing centering in a short time.

[0011]

According to the present invention, since the centering of the inlet guide is performed in accordance with the error of the outer dimensions of the rolled material measured at the outlet side of the rolling roll, the centering of the rolled material entering the inlet guide is caused by the loop and vibration. The effect of easily and accurately performing centering can be obtained without being affected by the centering error factor, and the rolled material can be accurately guided to the hole shape of the rolling mill.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an entrance guide used in an adjustment method according to the present invention.

FIG. 2 is an explanatory view showing a state in which an elliptical rolled material is misaligned and bites into a rolling roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet guide 1a Guide roller 2 Hydraulic cylinder 3 Dimension measuring device 4 Computing device 5 Solenoid switching valve PL Pass line R Rolling roll

Claims (1)

(57) [Claims] In a method for adjusting a pass line of an entrance guide provided on an entrance side of a rolling roll, a rolled material guided by at least a pair of guide rollers provided on the entrance guide and then rolled by the rolling roll is provided. The external dimensions are measured at the exit side of the rolling roll, and the required external dimensions of the rolled material are compared with the measured external dimensions,
If there is an error in the measured external dimensions, the path of the entrance guide is adjusted by adjusting the position of the entrance guide in a direction to eliminate the error and aligning the entrance guide with the rolling roll.