JPH0734979B2 - Centering method of guide roll for slab of curved continuous casting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a continuous casting machine for molten metal such as molten steel, and more particularly to casting in a continuous casting machine of a curved type in which a plurality of segments form a curved pass line. The present invention relates to a centering technique for a one-sided guide roll.

[Conventional technology]

This curved type continuous casting machine has a structure in which the slab after receiving the molten metal from the tundish and feeding it into the mold has a structure of flowing to the pull-out correction device side through the secondary cooling zone, and the vicinity of this secondary cooling zone In order to gradually change the slab from the vertical direction to a horizontal posture and flow the slab, a large number of guide rolls are arranged so as to form a continuous curved path.

These guide rolls are arranged vertically above and below the pass line of the cast slab, and generally a plurality of sets of guide rolls are incorporated in one segment. The alignment of the guide rolls is set by incorporating a plurality of segments as one unit in a line and adjusting the respective postures of the adjacent segments.

For example, in a conventional continuous casting machine for producing a slab having a thickness of about 200 mm, the position of the guide roll is adjusted by using a curve gauge A as shown in FIG. 5 (a). In the figure, the upstream and downstream segments 51, 52
Of the plurality of guide rolls 53, 54 incorporated into the guide rolls 53, 54, the gauge A is arranged so as to straddle three guide rolls 53, 54 on the sides where the segments 51, 52 are adjacent to each other and below the slab pass line. Set. The gauge A is placed on the peripheral surfaces of the guide rolls 53, 54 that are farthest apart with the reference thickness gauge B sandwiched therebetween, and the gap δ (the first thickness between the peripheral surfaces of the other guide rolls 53, 54 and the lower surface of the gauge A) The deviation in alignment can be known by measuring the size of FIG. 5 (b).
5 (b) is a view taken along the line II-II of FIG. 5 (a). For such measurement work, an operator enters the guide rolls 53 and 54 above and below the pass line to set the gauge A and the reference thickness gauge B, measure the clearance, and the like.

[Problems to be Solved by the Invention]

However, in a continuous casting machine for thin wall with a slab thickness of about 50 mm, the upper and lower roll intervals are only about 50 mm, and the roll pitch of the guide rolls 53, 54 is only about 200 mm, so it is quite necessary for workers to enter. Strict. Further, particularly when the bending radius of the pass line of the cast slab is about 3 m, interference will occur even if an attempt is made to widen the interval between the guide rolls 53, 54, and it is almost impossible for a worker to enter. Therefore, in the continuous casting machine for thin wall, gauges and reference gauges cannot be set on the circumferential surface of the guide rolls 53, 54, and the guide rolls 53, 54 can not be set online.
The position cannot be set.

The misalignment of the guide rolls 53 and 54 has a great influence on the quality of the slab, and if the alignment is not proper, it must be corrected immediately. Therefore, if it is not possible to measure the deviation of the alignment, which is a prerequisite for such a correction work, there will be a great obstacle to the production of the slab, and if the work is time-consuming, the productivity will be affected.

The problem to be solved in the present invention is to establish means capable of reliably measuring and correcting the alignment of the guide rolls by a simple method.

[Means for Solving the Problems]

A method for centering a guide roll for a slab in a curved continuous casting machine of the present invention, and a protrusion projecting outward from the pass line to at least two guide rolls counted from each of an inlet side and an outlet side of the slab of the segment. The axis is provided concentrically with the roll cylinder of the guide roll, the circumferential surface of the protruding shaft is used as a measuring surface by a gauge to measure the amount of misalignment of the guide rolls of each of the adjacent segments, and based on this measurement value, The feature is that the positions of the segments to be adjusted are adjusted.

[Action]

Among the guide rolls provided in the adjacent segments, provided on the inlet side and the outlet side of the slab, respectively, and provided outside the pass line of at least two guide rolls counted from the inlet side end and the outlet side end. Since the protruding shaft is concentric with the roll cylinder of the guide roll, if the position of the peripheral surface of the protruding shaft is known, the position of the peripheral surface of the roll cylinder that comes into contact with the slab can also be known. Therefore, if the circumferential surface of the salient shaft is used as the measuring surface with a gauge,
The shift amount of the guide rolls arranged in each of the adjacent segments can be measured.

〔Example〕

FIG. 1 is a front view of an essential part for explaining the method of the present invention, and FIG. 2 is a schematic vertical sectional view taken along the line II of FIG.

The curved portion of the continuous casting machine arranges a plurality of segments and forms a pass line of the slab by the guide rolls provided in these segments. FIG. 3 shows the arrangement of the segments. The downstream segment 2 having a different inclination angle is arranged with respect to the upstream segment 1, and a row of a plurality of other segments is provided by a combination similar to these. . Guide rolls 3, 4, 5 and 6 are incorporated in each of the segments 1 and 2 above and below the slab pass line. The guide rolls 3 to 6 for each of the segments 1 and 2 are arranged so that the cast pieces draw arc-shaped pass lines.

Of the lower guide rolls 4 and 6 provided in the segments 1 and 2, the three rolls located at the upstream and downstream ends of the pass line are used to adjust the position between the segments 1 and 2 as in the conventional method. To use. FIG. 4 is a vertical cross-sectional view of the guide roll 4 provided at the outlet end of the upstream segment 1 as viewed in the pass direction. The guide roll 4 has both ends of its roll cylinder 4a supported by bearing housings 7a and 7b, and a protruding shaft 4b is projected from one bearing housing 7a toward the outside. The projecting shaft 4b is formed by forming the outer peripheral surface thereof on the same axis as the roll cylinder 4a which comes into contact with the cast slab. Such a protruding shaft 4b is similarly provided on the two guide rolls 4 upstream of the guide roll 4 at the outlet end. Further, the three guide rolls 6 arranged in the pass direction from the inlet end of the downstream segment 2 are also provided with the projecting shaft 6b concentric with the roll cylinder 6a that contacts the similar cast piece.

The mutual position adjustment of the adjacent segments 1 and 2 is performed by applying the gauge A and the reference thickness gauge B to the protruding shafts 4b and 6b protruding outward from the bearing housing 7a and measuring the deviation amount of the roll alignment. That is, in the conventional method, the gauge A is inserted into the upper guide rolls 3 and 5 to measure the clearance between the lower guide rolls 4 and 6 and the outer peripheral surfaces of the roll cylinders 4a and 6a. Projection shafts 4b and 6b protruding outside the line
Is used instead. The measurement is as shown in FIG.
Of the three guide rolls 4 and 6 at the outlet end and the inlet end of the upstream and downstream segments 1 and 2, the two guide rolls 4 and 6 at the most upstream and the most downstream are used as the reference for the protruding shafts 4b and 6b, respectively. The thickness gauge B is placed, and the gauge A is placed on this. Then, the lower surface of the gauge A and the protruding shafts 4b of the optional guide rolls 4 and 6,
Measure the gap δ with 6b (measurement may be done by placing a gauge directly on the salient shaft).

The protruding shafts 4b and 6b are roll cylinders 4a and 6 of the respective guide rolls 4 and 6.
Since it is concentric with b, the value of the gap δ obtained by measurement shows the amount of misalignment of the roll cylinders 4a and 6a.
Therefore, if the relative position and orientation between the segments 1 and 2 are set again according to the value of the gap δ,
The alignment of the guide rolls 3 to 6 can be adjusted. In addition, adjustment of alignment using such protruding shafts 4b and 6b is similarly performed if protruding shafts are provided on three guide rolls arranged at the inlet end and the outlet end of other adjacent segments, respectively. You can do it.

In this way, the worker does not enter between the guide rolls 3 to 6 and uses the external protruding shafts 4b and 6b to make the segments 1, 2
The mutual positions of the guide rolls 3 to 6 can be adjusted, and the alignment of the guide rolls 3 to 6 can be adjusted online.

In the example, the guide rolls 4, 6 below the pass line
Although the projecting shafts 4b and 6b are provided on the above, the similar projecting shafts may be provided on the upper guide rolls 3 and 5 and used as the measurement surface by the gauge A. Further, the protruding shafts are provided on the three outgoing or incoming sides of the segments 1 and 2, but two protruding shafts may be provided.

〔The invention's effect〕

 The following effects can be achieved by the present invention.

(1) The gauge can be measured from the outside without the worker entering the line, and the gauge can be inserted between the upper and lower guide rolls or the worker can enter the line to measure the amount of deviation. There is no need, and it is possible to easily measure the amount of deviation and center the guide roll.

(2) Even in equipment such as for thin-walled products where the pitch between guide rolls is narrow or the radius of curvature is small, the amount of deviation can be measured from the outside, so alignment of the guide rolls can always be performed properly and good quality casting can be performed. It is possible to manufacture pieces.

(3) The work time can be shortened and the operation rate can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a main part for explaining the alignment adjusting method of the present invention, FIG. 2 is a schematic vertical sectional view taken along the line II of FIG. 1, and FIG. The front view of the main parts of the segments arranged in the curved portion of the continuous casting machine, FIG. 4 is a cutaway front view showing the built-in structure of the guide roll provided with the protruding shaft, and FIG. 5 (a) is the measurement of the deviation amount by the conventional method. Fig. 5 (b) is a front view showing the method, and Fig. 5 (b) is II-II in Fig. 5 (a).
It is the schematic by a line arrow. 1,2: Segment 3,4,5,6: Guide roll 4a, 6a: Roll body, 4b, 6b: Projection shaft 7a, 7b: Bearing box A: Gauge, B: Reference thickness gauge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Imi 1 Nishinosu, Oita-shi, Oita Prefecture Nippon Steel Co., Ltd. Inside the Oita Steel Works (72) Inventor Kenji Soto 1 Nishinosu, Oita-shi, Oita Prefecture Made in Japan Oita Steel Works (56) References Japanese Patent Publication No. 52-29962 (JP, B2)

Claims (1)

[Claims] 1. A bending type continuous casting machine, wherein a curved pass line is constituted by a plurality of segments, and a guide roll for a slab is incorporated in each of the segments so as to sandwich the pass line. At least two guide rolls counting from each of the inlet side and the outlet side of the guide roll are provided with projecting shafts projecting outward from the pass line coaxially with the roll cylinder of the guide rolls, and the circumferential surface of the projecting shafts is measured by a gauge. The guide roll for the slab of the curved continuous casting machine, which is characterized by measuring the amount of misalignment of the guide rolls of each of the adjacent segments as a surface, and adjusting the positions of the adjacent segments based on the measured values. Centering method.