JPS6350104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of changing slab width using a stepping cylinder in continuous casting.

In continuous casting, when changing the slab width using electric/hydraulic stepping cylinders,
Generally, as shown in FIG. 1, a mold is used which has a fixed long side 1 and short sides 2a and 2b that can be slid between them, and stepping cylinders 3a and 3 are attached to the short sides.
By applying an electrical command pulse to the stepping cylinder and moving the cylinder shaft forward or backward, the short sides 2a and 2b of the mold are slid and the width of the slab is changed.

Conventionally, as shown in FIG. 2, command pulses given to the stepping cylinder 3a are transmitted from a command pulse transmitter 4, and the command pulses are simultaneously inputted to a counter 5 and integrated by the counter to control calculation commands. The integrated value is given to the device 6. The arithmetic command control device 6 controls the slab width by giving or stopping a command pulse transmission start signal to the command pulse transmitter 4 based on the target slab width and the integrated value from the counter 5. Ta.

However, in this method, the calculation command control device 6
When using a microcomputer, sequencer, etc., the control of the microcomputer or sequencer is performed periodically at approximately 0.2 to 1.0 seconds, so the command pulse integrated value input from the counter 5 is compared with the target value. , to output a signal to the command pulse transmitter 4 to stop its output.
It takes about 0.2 to 1.0 seconds. On the other hand, the command pulse transmitter 4 continues to transmit command pulses to the stepping cylinder 3a even while the output stop signal input from the arithmetic command control device 6 is delayed, so the output of the short side 2a of the mold is stopped by the stepping cylinder 3a. It continues to operate until the signal is input, causing an error between the target set value and the actual value of the slab width.

In the experience of the inventors, the short side movement speed is 32mm/
When changing the width at min, the command pulse generator sends the command necessary for the short side to move, and
Approximately 0.5 when controlled by the 1sec arithmetic command control device 6
It was found that this resulted in a short-side stopping error of mm. This error directly results in an error in casting width, which has various negative effects on operation and product quality. Furthermore, this error increases as the short side movement speed increases, resulting in drawbacks such as the inability to change the slab width at high speed.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and change the casting width with high accuracy.The gist of the present invention is to step-by-step the command signal from the arithmetic control command device that instructs the start of transmission of the transmission pulse signal through a counter. A command pulse signal is given to the stepping cylinder's command pulse transmitter, and at the same time as the command pulse signal is given to the stepping cylinder, the feedback is fed back to the counter, and the counter calculates the integrated value of the transmitted pulse signals inputted as feedback. It compares with a set pulse target value that has been set and input into the counter in advance, and when the integrated value matches the target value, the command signal is stopped, and the transmission output of the command pulse transmitter is stopped. This is a method for changing slab width in continuous casting.

Next, the present invention will be explained based on FIG. 3 showing an embodiment.

FIG. 3 is a diagram showing the configuration of one embodiment of the present invention,
One short side of the mold is shown.

2a indicates the short side of the mold, and stepping cylinders 3a, 3a' are connected to the upper and lower sides of the short side. 4, 4' are command pulse transmitters that transmit command pulses for driving the electric/hydraulic stepping cylinder; from the command pulse transmitters 4, 4',
The command pulse is sent to the stepping cylinders 3a, 3.
At the same time as a call is made to a', a call is made to the counters 50 and 50'. The counters 50 and 50', like well-known preset pulse counters, have a function of setting a set pulse target value, a function of counting and accumulating input pulses, a function of comparing the accumulated value with a set pulse target value, and a comparison function. It is configured by combining functions such as outputting results and integrated values.

In addition to the above-mentioned functions, the counters 50 and 50' of the present invention transmit a command signal to the command pulse transmitter 4 and the command pulse transmitter 4 to start transmitting a transmit pulse signal and to maintain the transmit pulse signal issued from an arithmetic control command device 6, which will be described later.
4' and a function of stopping the command signal when the integrated value and the set pulse target value match by the comparison function.

Therefore, the counters 50, 50' of the present invention include:
A set pulse target value is input in advance from the arithmetic control command device 6, and the transmitted pulse signals from the command pulse transmitters 4, 4' are input as feedback to the stepping cylinders 3a, 3a' at the same time as they are transmitted. The counters 50, 50' integrate the transmitted pulse signals input as feedback, and compare the integrated value with the set pulse target value. On the other hand, when starting the width change, the arithmetic control command device 6 determines the start timing based on the operating conditions, and the arithmetic control command device 6 starts transmitting pulse signals from the command pulse transmitters 4 and 4'. A command signal is issued to command the This command signal is given to the command pulse transmitters 4, 4' via counters 50, 50', and once the start of transmission is commanded, the transmission state is maintained until the next stop signal is issued.

Here, through the counters 50, 50' means
The transmission command signal given from the arithmetic control command device 6 to the transmitters 4, 4' is sent to the counters 50, 50'.
The integrated value is compared with the set pulse target value, and when the two match, the counter 5 is
0,50' stops the above command signal.
This means that it is maintained without being restricted by the counters 50, 50'.

In other words, in the counters 50 and 50', the integrated value of the transmitted pulse signal input as feedback and the set pulse target value are compared as described above, and if this integrated value matches the set pulse target value, the above-mentioned pulse signal is changed at that point. Stop command signal.
As a result, the pulse transmission output of the command pulse transmitters 4, 4' is stopped, and the mold short side 2a is stopped. In addition, by inputting the actual number of pulses accumulated by the counters 50, 50' to the arithmetic command control device 6, when the casting width is changed next time, the counter 50, 50'
It is possible to calculate and set the set pulse target value to be outputted for 0 and 50' using the actual value as a reference. That is, by inputting the actual volume value to the calculation command control device 6, the calculation command control device 6 can grasp the casting width at the end of the width change, and compares the casting width based on the actual volume value with the target casting width, If a difference occurs between the two, a function can be provided to automatically correct the set pulse target value so as to absorb the error during the next width change, thereby further increasing the stopping accuracy when changing the width.

As described above, the present invention provides a command signal as a set pulse target value from the arithmetic command control device 6 to the counters 50, 50'.
0' to the command pulse transmitters 4, 4' to drive the stepping cylinders 3a, 3a', and the counters 50, 50' calculate the command pulse integrated value and target value. The short side of the mold can be stopped with high accuracy by comparing and detecting coincidence with the command pulse generator and stopping the output of the command pulse transmitter.

As described above, in the present invention, even if the control cycle of the arithmetic command control device 6 is long or the short side moving speed is fast, the short side can be stopped at the target value with high precision, and the experience of the present inventors Now, the stopping error mentioned above has almost disappeared. As a result, we were able to achieve great effects in improving productivity and quality.

As detailed above, the industrial effects of the present invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram showing a well-known general mold, Fig. 2 is a block diagram showing a conventional mold short side control mechanism, and Fig. 3 is a block diagram showing a short side control mechanism based on the present invention. . DESCRIPTION OF SYMBOLS 1... Long side, 2a, 2b... Short side, 3a, 3b... Stepping cylinder, 4, 4'... Command pulse transmitter, 5, 50... Counter, 6... Arithmetic command control device.

Claims (1)

[Claims] 1. In a casting method in which a short piece of the mold is moved via a stepping cylinder during continuous casting to change the width of the slab, a command signal from an arithmetic control command device that commands the start of transmission of a transmission pulse signal is transmitted. A command pulse signal is applied to the stepping cylinder's command pulse transmitter via a counter, and the transmitted pulse signal from the command pulse transmitter is supplied to the stepping cylinder, and at the same time feedback is sent to the counter. Compare the integrated value of the signal with the set pulse target value that has been set and input to the counter in advance,
A method for changing slab width in continuous casting, characterized in that the command signal is stopped when the integrated value matches the target value, and the transmission output of the command pulse transmitter is stopped.