KR890001022B1 - Measuring method of curvature radius of curved part of continuous casting machine - Google Patents

Abstract

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Description

Measuring method of curvature radius of curved part of continuous casting machine

1 is a state of use of the elastic bending plate device for measuring the radius of curvature.

2 is a schematic cross-sectional view of the device of FIG.

3 is a cross-sectional view taken along the line a-a of FIG.

4 is a coordinate diagram of the principle of curvature radius measurement by three points on an arc.

5 is a coordinate diagram of a curvature radius measuring principle according to the method of the present invention.

6 is a principle diagram applying the method of the present invention in practice.

7 is a schematic view of a state of use of a conventional measuring device.

(A) (b) is an illustration of the curvature radius measurement according to the method of the present invention, (c) is an illustration of the graph plotted the radius of curvature of the continuously measured angle rolls.

The present invention relates to a method for measuring the radius of curvature of a curved portion in a continuous period.

In continuous casting, the quality of cast steel is greatly influenced by the roll alignment condition of the cast steel. This can cause various internal defects, and in some cases, it can cause accidents such as BREAK OUT.

In the conventional method of measuring the curvature of the curved portion, as shown in FIG. 7, the bone (TEMPLETE) 15 made of a constant radius of curvature R is brought into close contact with three rolls (a), (b) and (c), and the intermediate roll Although the deviation from the reference curvature of the bone 15 of (b) was measured by a distance sensor, this method uses a fixed reference curvature because the curvature continuously changes at the inflection point of a continuous casting machine having several different curvature radii. It was not possible to use the holding bone 15 and even in a continuous casting machine in which the inner and outer rolls did not lie on a straight line toward the center point of the arc.

In order to solve the above-mentioned drawbacks of the present invention, the radius of curvature of a continuous casting machine in which the inner and outer rolls do not face toward the center of the arc and the radius of curvature of the casting machine having several different curvature radii or the curvature radii are continuously changed. It is to present a method of measuring the radius of curvature (R) by the curvature made by the elastic bending plate (8) (8 ') in contact with the rolls 10, 10' as shown in FIG. As shown in Fig. 4, if you know the coordinates A (X ₁ , Y ₁ ), B (X ₂ , Y ₂ ), C (X ₃ , Y ₃ ) on the arc, then A and B and A and by having the vertical bisecting line of the line segment (線分) connecting the C from the point the two lines meet the coordinates of the center of the circle O (X _-, Y _-), and to obtain the radius (R), but in practice, the continuous casting machine bend Since rolls are isolated from the outside by cooling equipment and covers, it is impossible to obtain coordinates of all rolls. Therefore, in the present invention, as shown in Fig. 5, the origin of the Cartesian coordinate E (0, 0) and the fixed point F (D, O) having a distance D on the X axis are set, and an arc having an arbitrary radius has two points E and F. By passing through, we measure the Y-axis distance H of the point G where the point meets the arc at the intermediate position (D / 2) between the points E and F so that we can know the coordinates of three points on the arc. That is, the radius of curvature H of the arc can be obtained by measuring only the distance H.

5 shows two points by making the straight line of distance D inscribed to the circular arc on the curved arc of the continuous casting machine, and measuring only the distance (ΔH) from the arc at the midpoint of the two points by simulating X, Y coordinates. Shows the principle of measuring the radius of curvature of the continuous casting machine.

According to the principle of the present invention as described above, by inserting two sheets of elastic bending plate between the inner and outer rolls, each elastic bending plate to create a curvature in the inner and outer sides according to the roll arrangement, located between the elastic bending plate and fixed at a certain distance The present invention provides a method for measuring the radius of curvature of a part on which an instrument is placed by setting two points on the coordinates by means of a fixed plate with points and displacement meters and measuring the distance ΔH from the arc at two intermediate points.

As shown in FIGS. 1-2, the apparatus for measuring the radius of curvature includes two elastic bending plates 8 (8 ') forming curvature, fixing points (9) (9') positioned at a distance D and a distance ( Fixing plate 1 with displacement meter 2, 3 measuring ΔH, H ') Elastic flexure plate 8, 8' is brought into close contact with the rolls 10, 10 'and fixed point of fixing plate 1 (9) Signal cable (4) for transmitting the signal detected by push spring (7) and spring box (5) displacement gauge (2) (3) to closely contact circular arc of elastic bending plate (8) with (9 ') , An amplifier 11 for converting the transmitted signal into an actual distance ΔH, H ', an interface 12 for mediating the distance ΔH, H' signals to a computer, and an input signal. The microcomputer 13 calculates the radius of curvature R and the roll interval T by (ΔH) and (H ').

Reference numeral 6 is a dummy bar head, and 14 is a printer.

According to the present invention, the method and principle of measuring the radius of curvature of the continuous casting machine bend using the apparatus will be described in detail with the accompanying drawings.

The measuring device 19 of the present invention is installed on the derby bar head 6 by the refraction coupling mechanism 17, wherein the dummy bar head 6 is positioned above the continuous casting machine. When the derby bar is moved downward, the elastic bending plate 8, 8 ′ of the measuring mechanism 19 is spaced by the upper and lower rolls 10, 10 ′ by the pressing spring 7 and the spring box 5. And the elastic plate 8, 8 ′ creates curvature according to the arrangement of the rolls 10, 10 ′, wherein the upper auxiliary displacement gauge 3 is fixed plate 1 and upper elastic flexure plate 8 ′. The gap (H ') of the lower part is measured, and the lower ΔH measuring displacement meter (2) is pushed out by the roll (10) because the movable part (2') protrudes out through the hole drilled in the elastic bending plate (8). It raises and detects the distance (H + ΔH) of the roll 10 and the fixed plate 1.

These signals are transmitted by the signal cable 4 to the microcomputer 13 via the amplifier 11 and the interface 12.

The microcomputer 13 analyzes the signal of the displacement gauge 2, and when the value is minimum, the roll gap T and the radius of curvature R of the displacement gauge 2 and 3 for valid information are given by Calculate

Roll spacing (T) = H '+ ΔH' + H + ΔH ............ (A)

Where H 'is the distance between the fixed plate 1 and the elastic flexure plate 8', ΔH 'is a correction value for the thickness of the fixed plate 1 and the elastic flexure plate 8', and H is the fixed plate 1 and the elastic The intrinsic distance between the flexure plates 8, ΔH is the displacement according to the curvature change.

Bending radius (R) = (X ₁ -X ₀ ) ² + (Y ₁ -Y ₀ ) ² ................. (B)

Where (X ₀ , Y ₀ ) is the center coordinate of the arc

(X ₁ , Y ₁ ) = (D / 2, ΔH) = G,

(X ₂ , Y ₂ ) = (O, O) = E,

(X ₃ , Y ₃ ) = (D, O) = F.

8 shows an example of measuring the radius of curvature of the continuous casting machine. When the measuring mechanism 19 of the present invention detects the first roll 10a and comes to the center thereof, ΔH exhibits a minimum value.

At this time, the elastic bending plate 8 is formed by the mold 18 and the rolls (10a), (10b) (10c) because the curvature radius (R ₁ ) measured at this time is the center of the first roll (10a) The radius of curvature of the local part (fixed point distance D) becomes (Fig. A) and when the measuring instrument 19 is centered on the second roll 10b, the radius of curvature R ₂ is centered on the second roll 10b. This is measured. (Figure b)

If the measurement is continued in this manner and the measured curvature radii (R ₁ , R ₂ ... R _n ) are grappled according to the roll numbers as shown in the figure, a roll with an incorrect curvature radius is found.

As described above, since the gap between the rolls and the radius of curvature are measured from the curvatures made by the two elastic plates, it is possible to identify an incorrect roll state by measuring the local radius of curvature of the continuous casting machine whose curvature continuously changes and the gap between the rolls.

Claims (1)

A fixing plate 1 having fixing points 9 and 9 'is provided between the rolls 10 and 10', respectively, between the elastic bending plates 8 and 8 'which are in close contact with each other to form a corresponding curvature. With the center of the fixing point 9 (9 ') positioned at the center of the roll 10, the distance H' between the fixing plate 1 and the elastic plate 8 'is measured and the roll 10 and the fixing plate are measured. (1) A method of measuring the curvature of a curved part of a continuous casting machine by measuring the distance (H + ΔH) and setting three points on the arc passing through the roll (10) as follows. 3 points on arc: (X ₁ , Y ₁ ) = (D / 2, ΔH) (X ₂ , Y ₂ ) = (O, O) (X ₃ , Y ₃ ) = (D, O) Where D is the distance between the fixed points 9 (9 '), H is the original distance between the fixed plate and the flexure plate, and ΔH is the displacement according to the curvature.

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