JPS5855159A - Foreseeing and detecting device for breakout of ingot - Google Patents

Abstract

PURPOSE:To foresee and detect the breakout of an ingot easily by providing multiple split rolls right under a mold, resolving the forces acting upon these rolls in a casting direction and in the direction at a right angle to said direction, and measuring the forces with respective load cells. CONSTITUTION:Molten steel 3 is charged through an immersion nozzle 2 into a mold 1, and a solidified shell 4 is formed with cooling water. Two pairs of rolls 5, 5' and 6, 6' are disposed for the steel 3 and the shell 4, right under the mold 1, and these roll groups are split to split rolls 5a-5d, 5'a-5'd, etc. which are connected via bearings 7a-7e, 7'a-7'e, etc. to load cells 9a-9e, 9'a-9'e, etc. The force F2 acting upon the plane direction of the cells 9, 9' is measured as the force generated by the thickness of the shell 4 and the force Fx acting upon their side surface directions is measured as the force generated by seizure, and from these forces, restraining breakout and non-restraining breakout are foreseen simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for predicting and detecting slab breakouts, and in particular, to prevent breakouts caused by the occurrence of solidified shells formed non-uniformly in a mold installed in a continuous casting process. The present invention relates to a slab breakout prediction and detection device for predicting breakout.

In the continuous caster 11, the molten steel in the casting trench is cooled in the mold and forms a solidified shell of about 10 to 20 holes in the mold. In such a mold, although heat extraction and cooling should be performed almost evenly, the shell is likely to be formed unevenly, and breakout occurs in such a case.

The causes of breakout can be roughly divided into 2 mm. In other words, there are two types: one is non-restrictive, which is affected by the thickness of the solidified shell, and the other is restrictive, which is caused by seizure K in the mold.
There are different types. Among these, the force transmission part K11 of the mold oscillation mechanism changes the resistance load due to the seizing of the mold wall and slab against the restraining O breakout.
It is possible to predict a breakout based on the change in the round part detected by the strain gauge attached. On the other hand, it is considered difficult to detect a non-binding breakout in the postscript.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slab breakout prediction and detection device that predicts both restrained and non-restricted breakouts and eliminates the above-mentioned conventional drawbacks.

In order to achieve the above objective, this blasting method installed a multi-segmented roll directly under the mold, and separated the force acting on the roll into the casting direction and the direction perpendicular to the scissoring direction, and measured each with a load cell. Based on this measurement result, breakout of the slab is predicted and detected.

Fig. 1 is a front view showing an embodiment of the present invention, and Fig. 92 is a plan view of an actual example J11 of Fig. 1X1.

The mold LD is forced to move in a straight line in the vertical direction, making an arc movement. Molten steel 3 is injected into the mold 1 through an image pouring nozzle 2. The injected molten steel 3 forms a solidified shell 4 on the hook surface by the cooling water in the mold 1. Immediately below the shell 1, there are two pairs of bars b16 with the molten steel 3 and the solidified shell 4 interposed therein.
' and 6' are arranged. As shown in Torera's four-wheel detail 2FiA, the molten steel 30 is divided into a number of rolls in the width direction according to the required IL' (in this example, it is 4, #I2
In the figure, only one pair of wire rolls 5 and 5' in the upper row 5a1
5b, 10% l5II, S'&, 5'1.5/C15
’) can be divided and arranged. Split rolls (5a ~ 5 (1) and (, z, ~ 5za) O each shaft end has bearings 7 (7&, 7b, 7・, 7d17・) and ?
'(7'IL, ?'ri, ?'Q, 7'dL,
7'a) q) Load 1 le 9 (91L, 9b, II (1, s
a, s.) and 11'(9'&.

111b% G'O% 9'"%9' @ )O each k is inserted and installed.Load cell 9 is installed at jl
As shown in the Is diagram, the force acting on the roll is divided into forces y, g, and yg in two directions at right angles and measured.

In this case, ]Px is the resistance force in the advancing direction of the slab, and the zero force in the perpendicular direction is 12.

An example of the structure of the load cell 9 is shown in a plan view in FIG. 4 and a side view in FIG. 5.

Load cell mounting holes 92 are drilled on the four sides of the detection body 910, and four round bearing fixing bolt holes 9s for mounting the Hiro bearing 7 are provided in the center. Furthermore, a plurality (11i in the figure) of O-slit-shaped parallel holes s4 are formed in both sides of the detection body 91 in the longitudinal direction, and a plurality of strain gauges SS for strain detection are mounted in a part of each hole. ing. Detection object 9
1 rin was detected from the 10,000-sided direction, and tf was detected from the 10,000-sided direction.
Fx is detected. Such a road doll is IIP with both ends fixed as shown in Figure I46! 9, so M ~ C and D , B j &ll K are the shear stress in the 1M direction,
Bending stress is generated in the IFx direction7, so if these are detected with a strain gauge, 1 rin and 1x can be measured.

Next, breakout detection will be specifically explained.

Let us consider a case in which a breakout of trenchless restraint occurs, that is, seizure occurs within the mold. When the mold and slab are seized, the force acting on the roll] Px is large compared to the steady state (when there is no seizing). Become. Therefore, by measuring this FxO change situation, restrictive router out can be predicted.

Next, consider the case of a 1-unconstrained breakout. As mentioned above, this is caused by the destruction of the solidified shell that has been formed, and is caused by various flea causes (bulging,
This is caused by the destruction of the solidified shell formed by the internal stress caused by (roll construction, thermal stress, etc.). Force acting on roll? , is considered to be the force generated by the bulging of the solidified shell due to the static pressure of the molten steel. Depending on the thickness of the solidified shell formed, the amount of bulging will vary and the amount of burr 1 acting on the roll will vary. The force acting on the roll from this? By measuring , an estimate of the thickness of the solidified shell formed can be made, and thereby an unconstrained breakout can be predicted.

Here, if the roller is divided into multiple parts in the width direction, it is possible to measure the distribution of solidified shells in the width direction.

ζO has the advantage of being able to perform mutual checks based on the force distribution in the radial direction.In addition, by installing one more wire in the pulling direction to detect force distribution, it is possible to perform mutual checks in the pulling direction. stone.

In addition, in the above embodiment, in the casting direction! Although the side with two sets of rollers is shown, only one set (rollers 5 and +p shown in FIG. 1) directly below the plate can be configured by K. Depending on the conditions of the machinery and equipment, it may be possible to use one roller.

As is clear from the above, according to the present invention, constrained breakout and non-constrained breakout can be predicted at the same time.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a plan view of the embodiment of FIG. 1, FIG. 3 is a front view of a load cell according to the present invention, and FIG. 4 is a load cell according to the present invention. FIG. S is a side view of the load cell shown in FIG. 4, and FIG. 6 is an explanatory diagram showing an example of the load distribution of the U-cell. 1...mold, 3...molten steel, 4...
Solidified shell, 5, S', 6.6'...roll, 5a%! ib, 51.5 (1,5'SL, 5'l
l, ls'a%616 - Split roll, γ&, 7b,
7(1,7(1%?・% 7”% 7′b%γ”s
7' (1,7/ka・rut, 8.8'... common frame, 9, il/, 9!L, 9t), 90.9 (1,9
1@, 9'a, 9'b, 9'a, 9'd, 9'
@...Load cell. Agent Tatsuyuki Unuma (and 2 others)

Claims (1)

[Claims] (11) In a slab breakout prediction and detection device that detects a breakout that occurs in a mold cast into molten steel, at least one pair of longitudinal pieces are disposed directly under a cough mold so as to insert the mold. The forces acting on the multi-segment roll divided into a plurality of parts in the direction and the multi-segment roll in the armpit are divided into a 10th force in the casting direction and a 20th force in the direction perpendicular to the first force.
A slab breakout prediction and detection device comprising: a load cell that decomposes the force into force and outputs the tenth force as a binding breakout signal and the second force as a non-binding breakout signal. .