JP2009178746A - Method and apparatus for changing continuous casting mold width - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous casting mold width and apparatus capable of surely checking whether a mold short side position is surely moving or not during casting mold width changing. <P>SOLUTION: When changing the pouring width of a slab during continuous casting with a continuous casting machine, temperatures in the mold are measured by a plurality of thermocouples rectilinearly embedded at prescribed intervals across the cross direction of the mold inside the mold long side, and the determination as to whether the short side position of the mold is surely moving or not is performed based on the temperature transition before and after the passage through the mold short side when a width change command is issued. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a continuous casting mold width changing method and apparatus for changing the width of a slab produced by a continuous casting machine during casting with a casting machine mold.

  When continuously casting steel with a continuous casting machine equipped with a mold width changing device (for example, see Patent Document 1), in order to efficiently produce slabs with different product widths, the mold width is changed during casting. Operations to change the casting width of the piece.

  Confirmation of whether or not the short side position of the mold is surely moved during the width change is extremely important for forming a solidified shell of the slab. This is because it may lead to serious troubles such as a breakout in which the slab shell breaks immediately after passing through the mold.

For this reason, conventionally, a position detector (for example, Celsin) is installed on the short-side drive shaft, and the position is detected by converting the rotation of the shaft into a movement amount. If the position detector does not change even though a drive command is output, it is determined that there is an abnormality, and the width change is urgently stopped to minimize damage.
JP-A-54-128939

  However, in the method of detecting the position by converting the rotation of the drive shaft into the movement amount described above, the joint between the drive shaft and the short side of the mold is mechanically disengaged, and the drive shaft rotates. Even in the state of not moving, since the position detector looks only at the drive shaft rotation, it may erroneously detect that the short side is moving. Further, erroneous detection may occur due to an electrical trouble of the position detector itself.

  Due to these false detections, a breakout may occur in the worst case, resulting in a situation where equipment is stopped for a long time due to recovery work or the like.

  In the present invention, in view of these problems of the prior art, it is an object to provide a continuous casting mold width changing method and apparatus that can surely confirm whether or not the position of the mold short side has moved reliably during the casting mold width change. And

  In the invention according to claim 1 of the present invention, when the casting width of the slab is changed during continuous casting by the continuous casting machine, the casting is linearly embedded in the mold long side at a predetermined interval in the mold width direction. Measure the temperature inside the mold with multiple thermocouples and determine whether the mold short side position has moved reliably based on the temperature transition before and after passing the mold short side when the width change command is issued. It is the continuous casting mold width changing method characterized by performing.

  Further, in the invention according to claim 2 of the present invention, when the casting width of the slab is changed during continuous casting by the continuous casting machine, linearly at a predetermined interval in the mold width direction inside the mold long side. Calculate the temperature transition before and after passing through the short side of the mold when a width change command is issued from multiple thermocouples that are embedded and measure the temperature inside the mold and the temperature measured by the thermocouple. A continuous casting mold width changing device comprising: an arithmetic device that determines whether or not the short side of the mold is surely moved based on the base.

  According to the present invention, the temperature inside the mold is measured with a plurality of thermocouples linearly embedded at predetermined intervals in the mold width direction inside the mold long side, and based on the temperature transition before and after passing through the short side. Thus, since it is determined whether or not the short side position of the mold is surely moved, it is possible to eliminate an equipment stop for a long time due to an abnormal width change and to prevent opportunity loss.

  The best mode for carrying out the present invention will be described below with reference to the drawings. First, FIG. 3 is a diagram for explaining an apparatus outline of a conventional continuous casting mold width changing apparatus. In the figure, 1 is molten steel, 2 is a mold, 3 is a long side, 4 is a short side, 5 is a position detector, 6 is a motor, 7 is a drive device, 8 is a controller, and 9 is a short side drive shaft. .

  Each of the molds 2 is composed of a pair of opposed long sides 3 and short sides 2. The molten steel 1 poured between the long side 3 and the short side 2 is continuously drawn from below by a drawing roller (not shown), and a continuous casting operation is performed.

  As shown in the figure, the width of the mold 2 is changed by moving the position of the short side 2. The movement of the short side 2 is that the rotation of the motor 6 is controlled by the drive device 7 that receives the operation command of the controller 8, and the short side drive shaft 9 is expanded and contracted by being transmitted to the rotation of the short side drive shaft 9. Is done. The movement amount of the short side drive shaft 9 is measured by converting the rotation of the shaft into the movement amount by the position detector 5 installed on the short side drive shaft 9.

  FIG. 1 is a view for explaining the outline of the continuous casting mold width changing device according to the present invention. In the figure, reference numeral 10 denotes a thermocouple, 11 denotes a temperature converter, and 12 denotes an arithmetic unit, and the other reference numerals are the same as those in FIG.

  Inside the long side 3 of the mold 2, a plurality of thermocouples 10 are linearly embedded at predetermined intervals over the mold width direction. As shown in the figure, it is better to improve the accuracy of measurement and subsequent determination by providing a plurality of the aforementioned thermocouple rows in the longitudinal direction of the long side.

  The measurement signals inside the mold at the respective positions measured by the plurality of thermocouples 10 are converted into temperature data by the temperature converter 11 and sent to the arithmetic device 12 for processing of calculation and determination.

  FIG. 2 is a diagram for explaining a state of temperature transition due to short-side movement. It is the figure which represented typically the time-dependent change of the temperature measurement value by a thermocouple in a certain position, and shows the temperature change before and behind the short side in that position. In a state where there is molten steel before passing through the short side, the temperature is increased and the fluctuation is small, but after passing through the short side, the hot molten steel disappears and the temperature measurement value rapidly decreases. This is a normal temperature transition in which the mold short side position is surely moved.

  However, in an abnormal state where the position of the mold short side does not move reliably, a rapid decrease in the temperature measurement value due to the short side passage is not recognized. As described above, it is determined whether or not the mold short side movement, that is, the mold width change has been normally performed, from the temperature transition before and after passing through the short side.

  Moreover, the position of the thermocouple in which the rapid decrease in the measured temperature value is recognized among the plurality of thermocouples is the mold short side position, and can be used for detecting the mold short side position.

It is a figure explaining the apparatus outline | summary of the continuous casting mold width changing apparatus which concerns on this invention. It is a figure explaining the mode of the temperature transition by short-side movement. It is a figure explaining the apparatus outline | summary of the conventional continuous casting mold width changing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molten steel 2 Mold 3 Long side 4 Short side 5 Position detector 6 Motor 7 Drive device 8 Controller 9 Short side drive shaft 10 Thermocouple 11 Temperature converter 12 Arithmetic unit

Claims (2)

When changing the casting width of the slab with continuous casting machine during continuous casting,
The temperature inside the mold is measured with a plurality of thermocouples that are embedded linearly at predetermined intervals in the mold width direction inside the mold long side, before and after passing the mold short side when the width change command is issued A method for changing the width of a continuous casting mold, wherein it is determined whether or not the position of the short side of the mold is surely moved based on a temperature transition. When changing the casting width of the slab with continuous casting machine during continuous casting,
A plurality of thermocouples that are embedded linearly at predetermined intervals across the mold width direction inside the mold long side and measure the temperature inside the mold,
From the temperature measured by the thermocouple, calculate the temperature transition before and after passing the mold short side when the width change command is issued, and whether the mold short side position has moved reliably based on this temperature transition A continuous casting mold width changing device, comprising: an arithmetic device for making a determination.

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