JPS62286654A - Judging apparatus for casting abnormality - Google Patents

Abstract

PURPOSE:To foresee runout apt to occur at the early time of casting at high reliance by judging the abnormality of a cast slab in accordance with a mold exciting force impressed by a mold oscillating mechanism and change of phase difference between the mold exciting force and oscillating displacement of the mold mechanism. CONSTITUTION:At the early time of casting, the mold 1 is oscillated at parallel toward drawing direction of the cast slab and hydraulic sensor 26, 27 and stroke sensor 28 detect the hydraulic pressure and oscillating displacement of the hydraulic cylinder 24 respectively. And, output electric signals S1, S2 of the sensors 26-28 are transmitted to an arithmetic part 13, at where they are converted to the mold exciting force to calculate the phase difference between the mold exciting force and the oscillating displacement. This exciting force data F and the phase difference data are transmitted to an output control part 15 and by this control, these data are indicated on a display 17. Further, the data F, are transmitted to a judging part 14, at where is judged whether the abnormality is occurred or not to foresee the falling-out accident. And, in case of judging existence of the abnormality, an abnormal detecting signal S3 is outputted to an alarm is given and at the same time, the data F, at abnormal time are recorded and outputted by a printer 18.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to continuous casting equipment 6! The present invention relates to a casting abnormality determination device used as a diagnostic device for Type 8 vibration equipment.

[Conventional technology]

In continuous casting equipment, in which molten steel is continuously injected into a mold with a high cooling capacity, and the molten steel, or slab, whose outer shell has solidified as it cools is pulled and cut into the required shape, there has been a recent An abnormality in slabs called . As shown in Fig. 6, this "handling" means that the dummy par biting part 3 of the slab 2 produced in the mold 1 at the early stage of casting cannot follow the force of the dummy par 4. This is a phenomenon in which the molten metal in the slab 2 gradually stretches and eventually breaks, causing the molten metal in the slab 2 to flow out. Since this is an abnormality that occurred after using a blank copper plate,
It is presumed that this is due to the large J friction force.

On the other hand, in continuous casting equipment, the mold 1 is photographed in parallel to the drawing direction of the slab 2 by a mold photographing device using a hydraulic cylinder, VA cam, etc. as a driving IJ+ source. Powder is sufficiently poured between the slab 1 and the slab 2 to reduce the frictional force, but this is suitable for preventing restraint breakout during steady casting conditions, and prevents "throughout" in the early stage of casting. It was not possible to prevent the occurrence of For this reason, many diagnostic devices have been devised in the past for diagnosing V# manufacturing abnormalities based on changes in vibration conditions, etc. for the mold imaging device, but all of these devices have problems with restraint in steady casting conditions. It was a prediction of a breakout, not a prediction of a breakout.

(Problems to be solved by the invention) 1) As mentioned above, it is difficult to predict the abnormality called "shiritama" which tends to occur in the early stage of conventional casting.
Due to the occurrence of ``bright widening'', molten steel was scattered in the continuous VI manufacturing equipment, resulting in the suspension of operation due to failure and replacement of various equipment.R1
1< something happened.

Therefore, the present invention aims to improve
@It is possible to predict with high reliability and improve the rR1Il rate in the casting process! The purpose of the present invention is to provide an abnormality determination device for 8-structure construction.

(Means and effects for solving the problems) In order to solve the above-mentioned problems and achieve the purpose, the present invention takes the following measures. Namely, the mold vibration mechanism is used to move the slab. The excitation force of the mold parallel to the take-out direction was measured with an excitation force measuring device, and the &8 mold vibration v
The vibration displacement of the J mechanism was measured with a displacement measuring device, and the change in mold excitation force measured with the excitation force measuring device and the above ts
determining an abnormality in the slab by an abnormality determining means based on a change in at least one of the changes in the phase difference between the mold excitation force and the vibration displacement of the mold vibration mechanism measured by the displacement measuring device;
This determination result is output by an output means.

Such measures were taken based on the experimental results shown below. The present inventors collected and analyzed data on various parameters related to the mold system 111 equipment when mold 1 is replaced in J1 continuous casting equipment, and found that abnormal changes appear in the data when "throughout" occurs. I explored the parameters. As a result, it was found that abnormal changes appeared in the mold excitation force applied by the mold expansion mechanism and the phase difference between this mold excitation force and the vibration displacement of the mold vibration mechanism.

Figures 1 (a) and (b) are data examples of the applied vibration force F and the phase difference Δ during normal conditions, and Figures 1 (C) and (d) are the data examples of the applied vibration force F and the phase difference Δ when "throughout" occurs. This is an example of data of phase difference Δ. As is clear from the comparison between (a) and (C) of the same figure, when "bottom centering" occurs, the lower limit value of the mold excitation force F rapidly increases as shown by A in the figure. Furthermore, as is clear from the comparison between (1)) and (d) of the same figure, the phase difference Δ, which had decreased as shown by B in the figure when "shirita" occurred, rose again, and the so-called double stroke Ra no IJ! It's causing an elephant.

Note that these phenomena occur within about one minute after the initial start of casting.

Therefore, by taking the measures mentioned above,
The mold excitation force is monitored and V! The phase difference between the mold machine vibration force and the vibration displacement of the mold vibration mechanism is monitored, and when an abnormal increase occurs in the lower limit of the mold excitation force, or when a two-step hammering phenomenon occurs in the phase difference, "throughout" is detected. can be predicted to occur.

〔Example〕

FIG. 2 is a block diagram showing the system configuration of an embodiment of the present invention. In the same figure, the excitation force sensor 11 is connected to the mold 1.
The displacement sensor 12 measures the vibration displacement of a mold photographing device that transmits the excitation force to the mold 1.

The electrical signals S1.32 output from both sensors 11 and 12 are then supplied to the calculation section 13.

The calculation unit 13 converts the electric signal from the excitation force sensor 11 into mold excitation force, and also outputs the phase difference between the electric signal from the excitation force sensor 11 and the electric signal from the displacement sensor 12. The mold excitation force data F and the phase difference data Δ obtained by the calculation unit 13 are determined by the determination unit 14.
and is sent to the output control section 15. The determination unit 14 determines the state of change in the mold excitation force data F and the phase difference data Δ.
When it is determined that at least one of these data has become abnormal, an abnormality detection signal S3 is output to the output control section 15, and at the same time, the alarm 16 such as a buzzer is also alerted to the abnormality. A detection signal @S3 is output, and the W alarm device 16 is driven to notify the occurrence of an abnormality. The output control section 15 automatically controls the drive of the display device 17 such as a CRT display and the printer 18, and always outputs the excitation force data F and phase difference data Δ supplied from the calculation section 13 to the display device 17. The excitation force data F and the phase difference data Δ at this time are printed out by the printer 18 when the abnormality detection signal $3 is given from the determination unit 14.

Figure 2 shows the casting J18! It is a schematic configuration diagram of the imaging device, and the &8 mold 1 is fastened to the mold vibration table 21,
! The 8-inch photography table 21 is connected to a hydraulic cylinder 24 which is a photography drive source via a vibration lever 22f3 and a photography beam 23.
It is connected to the. When the hydraulic cylinder 24 is driven by a cylinder drive mechanism 25, the mold 1 fastened to the mold moving daple 21 is moved in the direction of the arrow in the figure.

Further, the hydraulic cylinder 24 is provided with two hydraulic sensors 26 and 27 as the vibration force sensor 11, and the vibration force applied to the mold 1 can be measured by the difference in output between these hydraulic pressure sensors 26 and 27. There is. Further, a stroke sensor 28 as the displacement sensor 12 is also attached to the hydraulic cylinder 24, so that the vibration displacement of the mold vibration device can be measured.

Next, the llJ operation of this embodiment will be explained with reference to a flowchart showing a processing program in FIG. During the production period, the mold 1 is vibrated by a mold vibrating device parallel to the direction in which the slab is taken out, and at this time the hydraulic sensors 26 and 2
From 7, the oil pressure of the hydraulic cylinder 24 is detected, and from the stroke sensor 28, the vibration displacement of the hydraulic cylinder 24 is detected.

Electrical signals 81. which are output from each of these sensors 26-28. S2 is supplied to the calculation unit 13 (step (hereinafter abbreviated as ST) 1), where it is converted into a mold excitation force and the phase difference between the &I crab excitation force and the vibration displacement is calculated. (Sr1). The mold excitation force data F and the phase difference data Δ calculated by the calculation unit 13 are sent to the output control unit 15, and are displayed on the display 17 under control of the output control unit 15 (Sr1). Further, the mold excitation force data F and the phase difference data Δ are sent to the determination section 14, and it is determined whether or not an abnormality has occurred in order to predict "widening". In other words, the determining unit 14 monitors the lower limit (angular change) of the mold excitation force data, and determines that it is abnormal if it increases rapidly (Sr4).It also monitors the change in the phase difference data Δ, and If the striking phenomenon occurs, it is determined that there is an abnormality (Sr5).If it is determined that there is an abnormality in at least one of the above ST4 and Sr5, the abnormality detection signal S3 is sent to the alarm 16 and the output control unit. 1
5 (Sr6), and at the same time as the alarm device 16 issues an alarm, the printer 18 prints out the vi-type vibration force data F and phase difference data Δ at the time of abnormality (Sr7).

In this way, in this embodiment, the oil pressure sensor 26.2
7 and the stroke sensor 28 to monitor the mold excitation force and the phase difference between the mold excitation force and the vibration displacement of the mold vibrating device at the initial stage of casting, and! When the lower limit value of the type 8 excitation force suddenly increases, or when a double-strike phenomenon occurs due to a change in phase difference, it is determined that there is an abnormality and an i1 alarm is issued on a self-help basis. It is clear from the experimental results that when a change in mold excitation force or a change in phase difference occurs as described above, the probability that an abnormality called "through-through J" occurs is extremely low. In this case, it is possible to predict with high reliability "throughout" in the early stages of casting. As a result, when the alarm is issued, the slab 2 is removed by the dummy par 4.
By slowing down or stopping the handling speed, "shutdown" can be prevented. Also,
In this embodiment, since the mold excitation force data F and the phase difference data Δ are always displayed on the display 17, it is possible for the operator to predict ``handle the end'' by looking at it.

Thus, by applying this example, it is possible to "expand"
This reduces the incidence of vJ! due to molten steel leakage. Setting m
There is no need to break down or replace the AV1, and the fill skewer in the U-making process can be completely improved.

Note that the present invention is not limited to the above embodiments.

ρ1 For example, in the above embodiment, the hydraulic cylinder 24 is driven
Although the case where it is applied to the mold vibration device used as the source is shown, the fifth
Drive the eccentric cam 31 as shown in the figure! Needless to say, it can also be applied to a mold vibration mechanism of 1JIQ. in this case,
As the excitation force sensor 11, a strain gauge 33 attached to a bush rod 32 can be used. Further, the displacement sensor 12 is connected to the mold 1. Vibration table 21. ! Et
It can be attached to any place where vibrational displacement occurs, such as on the dynamic rem lever 22 or the vibration beam 23, and the vibrational displacement can be measured. It goes without saying that various other modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, the excitation force of the mold vibrating parallel to the direction of taking out the slab by the I7J mechanism can be measured with an excitation force measuring device. At the same time, the vibration displacement of the mold vibration mechanism is measured with a displacement measuring device, and the change in the mold excitation force measured by the excitation force measuring device and the mold excitation force and the displacement measuring device are measured. The abnormality determining means determines the abnormality of the slab by detecting at least one change in the phase difference with respect to the measured vibration 1j displacement of the mold vibration mechanism, and the output means outputs the determination result. , it is possible to predict with high reliability the "throughout" that tends to occur in the early stages of casting! 8 construction process f! &8T that can improve work efficiency
It is possible to provide an i-abnormality determination device.

[Brief explanation of the drawing]

Figures 1 (a) to (d) are diagrams for explaining the present invention in detail, Figures 2 to 4 are diagrams showing one embodiment of the present invention, and Figure 2 shows the system configuration. Block diagram shown, 3rd
The figure is a schematic diagram when applied to a hydraulic cylinder type mold photographing device, Figure 4 is a flowchart showing an abnormality determination processing program, and Figure 5 is an eccentric cam type V as a modification of the present invention.
FIG. 6, which is a schematic diagram when applied to an L-type vibrating device, is a diagram for explaining "handling". DESCRIPTION OF SYMBOLS 1... VT type, 2... Slab, 11... Excitation force sensor, 12... Displacement sensor, 13... Peak part, 14...
... Judgment unit, 15... Output control unit, 16... Alarm device, 17... Display device, 18... Printer, 21...
Mold rocking table, 24... Hydraulic cylinder, 26.2
7...Oil pressure sensor, 28...Sj/loaf sensor,
31...Eccentric cam, 33...Strain gauge. Applicant's agent Patent attorney Takeshi Suzue (a) (C)(1))
(d) Figure 1

Claims (1)

[Claims] In a casting device that pours molten steel into a mold and produces a slab solidified into a predetermined shape, a mold vibration mechanism applies an excitation force to the mold to vibrate the mold in parallel to a direction in which the slab is taken out. , an excitation force measuring device for measuring the excitation force of the mold vibrating by the mold vibration mechanism, a displacement measuring device for measuring the vibration displacement of the mold vibration mechanism, and a mold measured by the excitation force measuring device. Abnormality determination for determining an abnormality in the slab based on at least one of a change in excitation force and a change in a phase difference between the mold excitation force and the vibration displacement of the mold vibration mechanism measured by the displacement measuring device. 1. A casting abnormality determining device comprising: a means for determining abnormality in casting; and an output means for outputting a determination result of the abnormality determining means.