JPH0732109A - Method for cutting cast billet - Google Patents

Abstract

PURPOSE:To provide a method, by which a continuously cast billet can be cut at the starting point or the completing point in a width changing part. CONSTITUTION:In this cutting method, a cast billet length measuring machine 11 for measuring the length to be cut in the continuously cast billet 5, a cast billet width measuring instrument 7 for continuously detecting the cast billet width of the continuously cast billet 5 set to the position having a fixed distance from the length measuring machine 11 at upstream side from a cutter 10 and a computer 8 for grasping the production instruction of the cast slab, a cutting schedule length 11 of the continuously cast billet 5, the cast billet length obtd. with the length measuring machine 11 and the cast billet width continuously transmitted from the width measuring instrument, are used. The starting point or the completing point of width change in the cast billet width continuously transmitted from the width measuring instrument 7 is grasped with the computer 8 to cut the cast billet at the starting point or the completing point of the width change. By this method, the cutting at the starting point or the completing point of the width change can be obtd. and the produced quantity of scrap in the cast billet accompanied with the width change is minimized and the yield of the product can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for cutting a slab of a casting width changing portion manufactured by a continuous casting machine,
The present invention relates to a slab cutting method for determining a slab cutting length so that the amount of scrap slab generated by changing the width becomes a necessary minimum.

[0002]

2. Description of the Related Art In a continuous casting operation, in order to meet various product widths, by changing the width of the mold in the same cast, it is possible to continuously cast ingots of different widths and improve productivity. ing.

Further, in a cutting operation of continuous casting, a specified length of a cast piece to be sampled, an instruction for producing a cast piece such as an allowable range, a planned cutting length determined based on the instruction, and a cut-off of a final cast portion Values such as length are displayed as cold length. On the other hand, the continuous cast piece is cut in a hot piece state.

For this reason, when performing the cut calculation of the continuous cast pieces, the length of the continuous cast pieces in the hot state is multiplied by a predetermined constant heat shrinkage coefficient to convert the cold length, and the cold length is displayed. It is general to compare with the length of the above-mentioned manufacturing instruction, etc.

By the way, the following method is generally adopted as a method of cutting a slab with the width changing portion.

That is, since the width of the slab is changed by using the mold of the continuous casting equipment, the start or completion signal of the width change carried out in the mold section is sent from the control panel of the mold or the like to the length or width of the slab. Send the manufacturing order to a computer that knows
The computer grasps the length of the uncut slab from the mold to the cutting machine several tens of meters at the timing of receiving the signal,
The length of the uncut slab is multiplied by the heat shrinkage coefficient to obtain the length of the continuous slab in the cold state.The cold continuous slab length is compared with the manufacturing instruction of the slab displayed as the cold slab, and the scrap due to the width change There has been a method of determining the cutting length of a plurality of cast pieces up to the width change completion portion so that the amount of the chemical cast pieces is minimized.

[0007]

By the way, there is a distance of several tens of meters from the mold of the continuous casting machine to the cutting machine. Here, while the width change portion detected in the mold portion reaches the cutting point, it is often forced to increase or decrease the casting speed due to the matching between the casting process and the molten steel process, and the casting speed fluctuation due to the casting abnormality, The shrinkage amount of the slab changes due to the fluctuations in the casting speed and the fluctuations in the amount of secondary cooling water accompanying the fluctuations.

Therefore, as in the prior art, when the continuous cast pieces are cut at the timing when the width changing portion is detected by the mold and the cutting is continued based on the result, the expected cutting length and the actual continuous casting are performed. There is an error with the piece, and it is not possible to cut accurately at the width change start point or completion point. Therefore, the amount of scrap slab generated by changing the width is not minimized, and the casting yield is reduced.

In view of the above, the present invention solves the above-mentioned problems and determines the cutting length of the slab so that the amount of scrap slab generated by the width change becomes the minimum necessary when cutting the slab with the width change. Provide a cutting method.

[0010]

DISCLOSURE OF THE INVENTION The present invention which solves the above-mentioned problems is a slab length measuring machine for measuring the length of a continuous cast slab to be cut, and a constant length from the cutting machine on the upstream side of the cutting machine. A cast width measuring instrument that continuously detects the cast width of continuous cast pieces installed at a distance position, a manufacturing instruction of the cast piece, a planned cutting length of the continuous cast piece, and the continuous casting captured by the length measuring machine. It has a calculator capable of grasping the piece length and the slab width continuously sent from the width measuring instrument, and the width change start point or completion point can be determined from the slab width continuously sent from the width measuring instrument. The length from the width measuring instrument to the length measuring machine and the length of the continuous cast piece currently measured by the length measuring machine are summed at the time when the width change start point or the completion point is detected by the computer, and this total length and cutting schedule Compare the length with the size, and replace the planned cutting length with the total length when the total length and the planned cutting length are different. , Was cut slabs in width change start point or width change completion point, it is to achieve a minimum of scrap slab amount generated with the width change.

[0011]

The present invention is directed to a slab length measuring machine for measuring the length of a continuous slab to be cut, and casting of a continuous slab placed upstream of the cutting machine and at a fixed distance from the length measuring machine. A cast strip width measuring instrument that continuously detects the strip width, a production instruction of the cast piece, a planned cutting length of the continuous cast piece, a continuous cast piece length captured by the length measuring machine, and a continuous feed from the width measuring instrument. The basic configuration is to have a calculator that can grasp the incoming slab width.

The slab width is continuously measured by the width measuring instrument from the time when the slab accompanying the width change reaches before the slab width measuring instrument, and the measured width is transmitted to the computer. Since the slab width is continuously sent from the width measuring device on the computer side, it is possible to determine the width change start point or completion point from the slab width.

When the computer detects the width change start point or the completion point, the length of the continuous cast piece from the width measuring instrument to the length measuring machine and the length of the continuous cast piece currently measured by the length measuring machine are summed.

Further, by multiplying the total length by the heat shrinkage coefficient, the cold total length of the uncut slab on the output side of the width change detector can be grasped.

The total length converted into the cold state is compared with the planned length of cold cutting scheduled to be cut at the width change start point or the completion point.

Here, if the total length and the planned cutting length match, the cutting can be performed according to the planned length to cut at the width change start point or the completion point.

If the lengths of the two are different, the expected cutting length is replaced with the total length, so that the slab can be cut at the width change start point or the width change completion point.

The slab width can be measured by a width measuring instrument using an image processing device, a width measuring instrument using a laser, or the like, and mechanically measured by contacting a roller or the like in the width direction of the slab. You may.

[0019]

EXAMPLES FIGS. 1 and 2 show examples of width-change cast slabs. The arrow in the figure represents the casting direction. There are two typical slab shapes of the width changing portion, a Y-shaped 1 and an inverted Y-shaped 2.

For example, FIGS. 3 and 4 show an example in which the Y-shaped width-changed slab 3 is cut by the traditional method, and FIG. 5 shows an example in which it is cut by this method. The arrow in the figure indicates the casting direction.

Further, the slab before the width change is required to have the width W _1, and the slab after the width change is required to have the width W ₂ .

FIG. 3 shows A- on the upstream side of the width change completion point.
This is an example of cutting at A ′, and FIG. 4 is an example of cutting at BB ′ on the downstream side of the width change completion point.

The hatched portion in the figure is a portion to be scrapped because it is different from the width required by the manufacturing instruction of the slab.

On the other hand, FIG. 5 shows the width change completion point CC ′.
It is an example of cutting by the method, and it can be seen that the scraped portion is the smallest in comparison with FIGS.

The same applies to the case of the inverted Y-shape 2, and in this case, cutting at the width change start point produces the smallest amount of scrap scrap. A detailed description will be given below by taking the Y-shaped 1 as an example.

6 and 7 show part of a side view and a plan view of the embodiment of the present invention. The basic configuration of the invention is a cutting machine 1.
A slab length measuring machine 11 for measuring the length of a slab to be cut is installed upstream of 0, and further at a position separated from the length measuring machine 11 by a constant distance l ₃ on the upstream side of the length measuring machine 11. A slab width measuring instrument 7 for continuously detecting the slab width installed, a planned cutting length l ₁ of the continuous slab, a slab length l ₂ currently measured by the length measuring machine 11, and the above The calculator 8 is capable of grasping the slab width continuously sent from the width measuring device 7.

The hatched portion of the continuous cast piece 5 in the figure is a width changing portion. In this example, as the slab width measuring instrument 7, a camera 6 that projects the shape of the slab and an image processing device that processes the image of the slab and converts it into a slab width are used.

FIG. 8 shows a processing flow in the computer 8.
A slab production command is input to the computer 8 in advance.

Next, when the width change in the mold 4 is completed, the mold 4
The computer 8 receives the width change completion signal H from the mold width control board 14 of the above, and at that time, grasps the entire length of the hot uncut continuous cast piece 5 existing between the mold 4 and the cutting machine 10, The length is multiplied by a predetermined constant heat shrinkage coefficient to obtain the total length of the uncut continuous cast piece 5 converted into the cold length.

The total length of the uncut continuous cast piece 5 converted to the cold length is compared with the above-mentioned cast piece manufacturing instruction to plan the length of the uncut continuous cast piece 5. At the same time, an expected cold cutting length L ₁ of the slab with a width change is also planned.

Next, the slab width was continuously measured by the slab width measuring instrument 7 from the time when the continuous cast slab 5 accompanied by the width change reached before the slab width measuring instrument 7, and the measurement was performed. The width is transmitted to the calculator 8.

On the computer 8 side, the slab width is continuously sent from the slab width measuring device 7, so that the slab width before change W ₁
It can be judged that the width change completion point Y is the point where the change from W to W ₂ is completed.

At the time when the calculator 8 detects the width change completion point Y, the continuous cast piece length l ₃ between the cast piece width measuring instrument 7 and the cast piece length measuring machine 11 and the present cast piece length measuring machine 11 are measured. The measured length l ₂ of the continuous cast pieces is summed to obtain (l ₂ + l ₃ ).

Further, by multiplying (l ₂ + l ₃ ) by the heat shrinkage coefficient, the cold conversion length (L ₂ + L ₃ ) of the uncut continuous cast piece at the exit side of the width change completion point Y is obtained. it can.

Here, the planned length of cold cutting L ₁ for cutting at the width change completion point Y is compared with L ₂ + L ₃ which is the total length converted to the cold, and the cutting is performed. Planned lengths L ₁ and L ₂
If + L ₃ matches, the cutting command signal G is transmitted from the computer 11 to the cutting machine control panel 9 at the time when the measured length of the slab length measuring machine 11 in cold conversion matches L ₁ .

If the planned cutting lengths L ₁ and L ₂ + L ₃ are different, the planned cutting length L ₁ is replaced with the total length L ₂ + L ₃ to convert the slab length measuring machine 11 into the cold conversion. Measurement length is L ₂ + L ₃
When it coincides with, the computer 11 transmits the cutting command signal G to the cutting machine control panel 9. With the above processing, it is possible to cut at the width change completion point Y.

Although it is possible to reduce the heat shrinkage error of the slab by reducing the distance l ₃ between the slab length measuring device 11 and the slab width measuring device 7 as much as possible, the width change completion point Y After the detection of, the time for determining whether or not the expected cutting length l ₁ is appropriate is required. Therefore, l ₃ may be determined from the maximum casting speed and the time required for this determination.

[0038]

By applying the present invention, it is possible to cut at a width change start point or a completion point, and it is possible to minimize the amount of scrap slabs that accompany the width change and improve the product yield. .

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a width-changed slab.

FIG. 2 is an explanatory diagram showing an example of a width-changed slab.

FIG. 3 is an explanatory view of cutting a width-change cast slab by a conventional method.

FIG. 4 is an explanatory view of cutting a width-change cast slab by a conventional method.

FIG. 5 is an explanatory view of cutting of a width-change cast slab according to the present method.

FIG. 6 is a side view showing an embodiment of the present invention.

FIG. 7 is a part of a plan view showing an embodiment of the present invention.

FIG. 8 is a processing flow chart in the computer of the present invention.

[Explanation of symbols]

1 Y-shaped 2 Reverse Y-shaped 3 Y-shaped Width-changed slab 4 Mold 5 Continuous cast slab 6 Camera 7 Slab width measuring instrument 8 Calculator 9 Cutting machine control panel 10 Cutting machine 11 Slab length measuring machine 12 Cutting completed Slab 13 Slab length measurement roll 14 Mold width control panel E Slab width measurement value signal F Slab length measurement value signal G Cutting command signal H Width change start or completion signal X Cutting planned point Y Width change completion point 1 ₁ Heat Planned cutting length between ₂ l ₂ Measuring length of continuous cast slab during hot 1 ₃ Distance between slab length measuring instrument and slab width measuring instrument during ₃ hot l ₄ Planned cutting point during hot Distance from width change completion point L ₁ Planned cutting length in cold L ₂ Measurement length of continuous cast piece in cold L ₃ Distance between cast piece length measuring machine and cast piece width measuring instrument in cold state L ₄ Distance between planned cutting point and width change completion point in cold condition W ₁ Width of cast piece before width change W ₂ Width of cast piece after change

Front page continuation (72) Inventor Masafumi Kawaguchi 1 Fuji-machi, Hirohata-ku, Himeji City Nippon Steel Corporation Stock company Hirohata Works

Claims (1)

[Claims] 1. A slab length measuring machine for measuring the length of a continuous slab to be cut when cutting a continuous cast material having a width change cast by a continuous casting machine, and a slab length measuring machine on the upstream side of the slicing machine. And a slab width measuring device that continuously detects the slab width of the continuous slab installed at a position that is a constant distance from the length measuring machine, a manufacturing instruction of the slab, and a planned cutting length of the continuous slab and the aforesaid It is equipped with a calculator that can grasp the continuous cast piece length captured by the length measuring machine and the cast piece width continuously sent from the width measuring instrument, and is wider than the cast piece width continuously sent from the width measuring instrument. When the change start point or completion point is captured by the computer and the width change start point or completion point is detected, the length from the width measuring instrument to the length measuring machine and the length of the continuous cast piece currently measured by the length measuring machine And the total length and the planned cutting length are compared, and if the total length and the planned cutting length are different, cutting is performed. A slab cutting method characterized by replacing the planned length with the total length and cutting at the width change start point or the width change completion point.