JPS5829559A - Continuous casting installation - Google Patents

Abstract

PURPOSE:To make the sizes in width and thickness directions with respect to a longitudinal directional uniform by providing mold varying devices for forming respective ingots and a mold positioning device for setting the sizes in the width or thickness direction of the respective ingots to a casting device and forming the respective ingots at the width or thickness sizes slightly larger in the central part than in the end parts. CONSTITUTION:The length of an ingot 1 is measured and a target value is operated by the data from a setter 17 for cutting length of slabs, a setter 18 for thickness of slabs, a setter 19 for width of slabs, a setter 20 for thickness in end parts, a setter 21 for width in end parts and a setter 22 for length of end parts as well as the count outputs of a counter 15 to which the outputs of a pulse oscillator 16 mounted to pinch rolls 10 are supplied. The target value is applied to a mold positioning device 13, which adjusts the width and thickness of the ingot 1 automatically. The ingot 1 is formed to the sizes in the width and thickness in the central part thereof slightly larger than in the end parts thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to continuous casting equipment, and more particularly to continuous casting equipment that continuously produces slabs by continuously casting molten steel, rolling it, and cutting it into predetermined lengths.

Each slab obtained by casting molten steel in continuous casting equipment (
As shown in FIG. 1, the slab (2) is a rectangular parallelepiped with a rectangular cross section, and unlike slabs manufactured from ingots using a blooming mill, the shape of the ends does not collapse.

This slab 1 is fed to the next thick plate rolling mill or continuous hot rolling mill to be made into thick plates or thin plates. The width of the plate tends to be narrower, and the thickness of the plate tends to be thinner.

The slab IJj having such a shape is further fed to a finishing LE rolling machine and rolled, and the resulting finished products such as thick plates, thin plates, or thin steel strips (pot coils) have their center portions at their ends. In comparison, the plate width is narrower and the plate thickness is thinner.

The reason for this is considered as follows. In continuous casting equipment, the rough rolling mill performs rough rolling of the slab before the rolling process in the finishing mill, and Figure 3 shows the tandem Japanese rolling mill placed in front of the hot finishing mill. has been done. In FIG. 3, the slab 1 is rolled into a first rough rolling mill 2 by a roller table 4. It is fed to the subsequent rough rolling mill 3 and rough rolled. The rolling mill sets 2 and 3 are driven by drive motors 5 and 6.

The front and rear ends of the slab 1 to be rolled here are in a tension-free state between the roughing mills 2 and 3, and when the slab 1 is simultaneously rolled by the surface roughening mills 2 and 3, this condition occurs. Tension is applied to the material, resulting in rolling as shown in FIG.

To prevent this, in the past, the slab 1 was rolled in a tension-free state as much as possible, but since rough rolling of the slab 1 in such a tension-free state is accompanied by operational risks, this rolling was not carried out. This was done while applying a certain amount of tension to 1. Therefore, the product obtained by the finishing mill next has a narrower width and greater thickness at the center than at the ends.

As described above, conventionally, there has been a problem that the center part of the product obtained through the rough rolling process and the finish rolling process is narrower and thinner than the end parts. Generally, the amount by which the plate width of a finished product is narrowed is about 5 to 15 mm, although it is related to the above-mentioned tension, slab thickness, temperature, etc. - Trimming is performed to make the width of the product uniform. As a result of this trimming, conventional
The percent yield has decreased.

As described above, conventional continuous casting equipment has the drawback of decreasing the yield of finished products.

The purpose of the present invention was to solve the above-mentioned conventional problems, and to provide continuous casting equipment in which the width and thickness of roughly rolled slabs are uniform in the longitudinal direction. be.

In order to achieve the above object, the present invention provides continuous casting equipment including a casting device that continuously pours molten steel and a rough rolling mill that roughly rolls each slab fed from the casting device. , the casting device includes a mold variable device that forms each slab, and a mold positioning device that sets the width or thickness dimension of each slab, and the mold positioning device that sets the width or thickness dimension of the center portion of each slab. It is formed to be slightly larger than its end width or thickness.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows a preferred embodiment of the invention, in which molten steel is poured into a mold 8, the outer skin of which is cooled and formed into a slab 1, and a guide roll 9. It is pulled out onto the roller table 4 via the pinch rolls 10. At this time, the molten steel has completely solidified to the inside, and is cut into a predetermined length by the slab cutter 23.

The casting device of the present invention has a mold variable device 12 and a mold positioning device 13, and the width or thickness direction dimension of the slab 1 at the center thereof is larger than the width direction or thickness direction dimension at both ends thereof. Form it like this.

Here, the mold variable device 12 varies the width direction or thickness direction of the slab 1, and the mold positioning device 13
is used to adjust and set the variable amount.

In FIG. 4, the variable amount is detected by the position detector 11, and the detected amount is supplied to the mold positioning device, and the mold positioning device 13 uses feedback control to always make the variable amount match the target value. I can do it.

Further, in this embodiment, the target value of the mold positioning device 13 is determined from the calculation load 14, and the plate width of the slab 1,
Adjustment of plate thickness is done automatically.

The amount of change in the mold position by the arithmetic unit 14 and its timing can be obtained from the following data.

(1) Dimensions between stands in the rough rolling mill group, (2) Plate width, plate thickness, and cutting length of the slab, (3) Finished plate width and plate thickness in the rough rolling mill group, (4) Rough rolling The amount of change in plate width and plate thickness in the longitudinal direction of the slab rolled by the machine, that is, the calculation device 14 calculates the above target value from the following two data, etc., and inputs this value to the mold positioning device 13. I can do it. In this embodiment, these data are stored in the slab cutting length setter 17. Slab thickness setter 18. Slab width setter 19. End plate thickness setting device 20. End plate width setting device 21. A force is set in advance from the end length setting device 22 to the arithmetic unit 14.

The calculation device 14 can measure the length of the slab 1 based on the count output of a counter 15 to which the output of the pulse generator 14 attached to the pinch roll 10 is supplied, and uses this for the above calculation. .

Based on the various data described in "2" above, the calculation device 1
According to the target value obtained in step 4, slab 1 has a plate width at its center,
The thickness of the plate is slightly larger than that of the end portion.

FIG. 5 shows the slab 1 formed by the mold position variable device 12, and FIG. FIG. 2C shows the changed one, and the thickness direction thereof is gradually changed. Prisoner, in Figure 5 A
/ is slab cutting length, t'M is slab thickness, WM' is slab width, tT' or t/B is tip plate thickness, WT' or Wn' is tip plate width, 2'T or L' n is Indicates the length of the tip.

As explained above, according to the present invention, the plate width at the center of the slab fed to a tandem rolling mill or the like.

Since the plate thickness dimension is made larger than that of the end portion, the slab after rolling has uniform dimensions in the width direction and the thickness direction with respect to the longitudinal direction.

As a result, according to the present invention, it is possible to improve the yield of products. If the front and rear ends of the slab are formed thinner, it will be easier to bite in the next rough rolling mill, and the occurrence of stains at that time can also be reduced. Furthermore, although the front and rear ends of the rolled slab form fish and tank shapes, the amount of fish and tank formation is reduced, and in this respect as well, the yield of the product can be improved.

Note that it is also preferable to manually operate the mold positioning device 12.

[Brief explanation of drawings]

Figure 1 is a perspective view of a slab before rough rolling in conventional continuous casting equipment, Figure 2 is a perspective view of a slab in a rough rolling mill in conventional equipment, and Figure 3 is a 1:2 stand tantem type. A rough rolling mill, FIG. 4 is a block diagram of a preferred embodiment of the present invention, and FIG. 5 (a
), (1)), and (C) are explanatory views of the shape of the slab before rough rolling in the example of FIG. 4. ■... Slab, 2... First stage rough rolling mill, 3... Second stage rough rolling mill, 8... Mold, 12... Mold position variable device, 13... Mold positioning device, 14...・・・
Arithmetic device, 15...Counter, 16...Pulse transmitter, 17...Slab cutting length setting device, 18...Slab thickness setting device, 19...Slab width setting device, 2o...End Part plate thickness setting device, 21... End plate width setting device, 22...
End length setting device. Agent Patent Attorney Akio Takahashi ° (9) Figure 8 Figure 3

Claims (1)

[Claims] ■ Continuous casting equipment including a casting device that continuously pours molten steel and a rough rolling mill that roughly rolls each slab fed from the casting device, the casting device comprising: , a variable mold device for forming each slab so that the dimension in the width direction or thickness direction at the center thereof is larger than the dimension in the width direction or thickness direction at both ends thereof; and the width direction or thickness direction of each slab. A continuous casting device comprising: a mold positioning device for adjusting and setting dimensions. 2. The apparatus according to claim 1, comprising a calculation device that calculates the width direction or thickness direction dimension of each slab based on various data given in advance and controls the mold positioning device based on the calculation results. Continuous casting equipment characterized by the following: