JPS62252647A - Production and apparatus for casting sheet metal continuously - Google Patents

Abstract

PURPOSE:To prevent defects, such as cracking, scratching, wrinkling, etc., caused by development of uneven solidification of molten metal and to improve the product quality, by casting a slab having large sectional area, which is not yet fully solidified, and reducing the section by reduction rolls. CONSTITUTION:The molten metal 3 is developed the solidified shell on the outer circumference as being cooled by a mold 1, and drawn as the casting slab 5A, which is not yet fully solidified, having a section B1XH1 after removing the mold, and then cooled by cooling water spray device 4 to increase the thickness of the solidified shell. Next, it is reduced to a section B2XH2 by a reduction rolls 6 and cooled by cooling water spray device 8 to increase further the thickness of the solidified shell. In succession, the casting slab 5A, which is not fully solidified, is reduced to a section B3XH3 by a reduction roll 7, and also becomes to fully solidified casting slab 5B by a cooling water spray device 8A. The casting slab 5B is cut by a crop shear 9 at the time of drawing up a dummy bar and by rolling mill 10, 11, it is rolled to the section B4XH4, B5XH5 in order, to finish to the hot strip 5C having the prescribed thickness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention makes it possible to continuously manufacture metal materials such as thick plates, thin plates, and shapes by performing casting, crushing, and further rolling. This invention relates to a method and apparatus for continuously manufacturing metal pieces.

[Prior Art] Current rolled materials, such as thick plates and hot strips, are produced by cooling and solidifying molten metal from a tundish f poured into a mold a, as shown in Fig. 4. It is then pulled out as an internal unsolidified slab surrounded by a surrounding solidified shell at a medium temperature and released from the mold by a vibrating action), and is transported while being supported by a presser roll B, and is sprayed with cooling water C placed between the presser rolls 6. A long slab d with a large cross-sectional area is continuously cast while cooling, and this slab d is further divided into required lengths and then rolled into products with a predetermined shape and thickness and small cross-sectional area using a rolling mill. I try to do that. Therefore, such a rolled material manufacturing process requires large-scale equipment to roll from a large cross-sectional area to a small cross-sectional area, and requires enormous construction costs, maintenance costs, labor, shaping energy, etc.

Recently, for the purpose of reducing costs, we have developed casting machines that are smaller and capable of higher speed casting than the conventional mold type casting machines, such as twin roll type casting machines, caterpillar type casting machines, and belt/chilled roll type casting machines. etc. were devised.

Figure 5 shows a twin-roll casting machine, in which molten metal is poured from the nozzle of a tundish f between cooling rolls e and e, which have a roll gap that determines the thickness of the slab, and the cooling rolls are internally cooled. The molten metal is cooled and solidified on the circumferential surfaces of e and e, and the slab d is formed by the rotation of cooling rolls e and e.
is sent out continuously.

Fig. 6 shows a caterpillar type casting machine, in which a pair of caterpillars h, h coupled with a cooling mold block g are arranged facing each other, a mold space is formed between them, and the caterpillar h
, h are moved, so that the molten metal poured from one mouth of the mold space is sent out as slab d from the other mouth.

Furthermore, Fig. 7 shows a belt/chilling roll type casting machine, in which an endless belt j is placed side by side with a cooling roll i to form a mold space, and the rotation of the cooling roll i and the movement of the belt j create a mold space. , the slab d is sent out in the same way as the caterpillar type.

[Problems to be Solved by the Invention] However, in the above-mentioned twin-roll type casting machine, since completely solidified slabs are cast, (i) strips can be directly cast by reducing the roll gap; Because of the thinness, uneven solidification occurs in the molten metal that is rapidly cooled on the circumferential surface of the cooling rolls e and e, and boundaries are created due to differences in crystal structure due to temperature differences.This causes plate cracks, plate flaws, wrinkles, etc., and deteriorates the strip quality. harm

(i) If the roll gap is set large, it is possible to cast slabs, thick plates, etc., but the casting speed cannot be increased because there is a limit to heat extraction capacity.

There are other problems.

In addition, in the caterpillar type casting machine, (i) a small mold block g is achieved;
A gap is generated on the casting surface of the slab d due to the gap between the mold blocks.

(Since the mold block Q is coupled, the thickness of the slab d cannot be made uniform due to thermal deformation and flaking of the block, making it unsuitable for strip casting.

There are other problems.

Furthermore, the belt/chilled roll type casting machine has a fatal shortcoming in that the belt j has a short lifespan.

Therefore, the reality is that these casting machines have not yet been put into practical use.

In view of these circumstances, the present invention prevents the occurrence of board cracks, board flaws, wrinkles, etc., and also allows stripping,
The purpose is to continuously manufacture metal materials such as thick plates and shapes from molten metal.

[Means for Solving the Problems] The present invention provides a mold-type continuous casting machine that cools molten metal to cast unsolidified slabs and also releases the adhered slabs from the mold; It has a structure that includes a crushing roll device that reduces the cross-sectional area and shapes the slab into a desired cross-section by crushing it while transporting it backward, and a cooling device that cools and solidifies the slab.

[Function] By casting a thick unsolidified slab with a large cross-sectional area in a mold, the periphery of the slab cross section is uniformly cooled, and each successive cross section of the slab being transferred is solidified with a continuous crystal structure. At the same time, the slab is released from the mold, and the slab is further cooled by a cooling device and crushed while being transferred by a crushing roll to extrude a part of the unsolidified portion of the new surface of the slab to reduce the cross-sectional area,
The product is shaped into the desired shape while increasing the proportion occupied by the solidified portion, and the cross section is made to have a product cross-sectional area or a small cross-sectional area close to it.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In Fig. 1, 1 is a vibration type mold with an internal water cooling structure, 2 is a tundish for pouring molten metal 3 into the mold 1, and 4 is a cooling slab 5A drawn out from the mold 1. a first cooling water spray device 6 for unsolidified slab 5 after passing through the first cooling water spray device 4;
7 is a second crushing roll installed downstream of the first crushing roll 6; 8 is each crushing roll 6.
8A is the third cooling water spray device located downstream of the crushing roll 7; 9 is the completely solidified slab sent through the third cooling water spray device m8A; Crop shear cutting the front and rear ends of 5B, 10
．． Reference numeral 11 indicates first and second rolling mills that sequentially roll the fully solidified slab 5B to form hot strips 5C, and 12 indicates a dividing shear that divides the hot strips 5C.

Now, when the molten metal 3 in the tundish 2 is poured into the mold 1, the molten metal 3 is cooled by the mold 1, a solidified shell is generated on the outer periphery, and the molten metal 3 is separated from the mold by the vibration motion of the mold 1, and the second As shown in figure (a), the cross section BIXHt
The tip of the unsolidified slab 5A is first pulled out by a dummy bar, and is cooled by the first cooling water spray device 4 to increase the thickness of the solidified shell. The unsolidified slab 5A is then crushed by the first crushing roll 6 into a cross section B2XH2 as shown in FIG. It will increase further. Subsequently, the unsolidified slab 5A
is crushed by the second crushing roll 7 into a cross section B3 It becomes piece 5B. The tip of the completely solidified slab 5B is cut off by the crop shear 9 when the dummy bar is initially drawn out, and then rolled into the shape shown in FIG. 2C=><E) by the first and second rolling mills 10.11. Cross section 84XH4 as shown,
It is sequentially rolled into B5, XH5, and finished into a hot strip 5C of the required thickness.

The rear end of the completely solidified slab 5B is cut by a crop shear 12 in the same way as the front end.

In this way, casting and rolling are carried out continuously from the mold 1 to the second rolling mill 11, and the operation is continued until there is no molten metal 3 in the tundish 2. Of course, by continuously pouring molten metal into the tundish 2, continuous operation for a long time is possible.

In the above, an unsolidified slab 5A is cast in a mold 1 with a cross-sectional area larger than that of the fully solidified slab 5B, and this is successively crushed by crushing rolls 6.7 to reduce the cross-sectional area of the slab 5A. Therefore, it is possible to transport the slab while increasing the solidification rate of the cross section of the slab. That is, crushing roll 6.7
When the slab 5A is crushed with It can speed up coagulation. Therefore, the relationship between the pouring speed Ve and the transfer speeds (1), v2, and (3) of the slab 5^ of 1 part of the mold and 6.7 parts of each crushing roll is as follows: Ve < Va = V2 = Vz.

In addition, since the fully solidified slab 5B needs to be rolled with a constant width, the transfer speed V of the slab 5B in rolling mill sections 10 and 11 is
4, Vs becomes V4 < Vs, and the relationship between the overall transfer speed is Ve < V
t −V2 =V3 <Va <Vs.

Therefore, such speed conditions allow continuous operation.

Incidentally, in the above embodiment, the hot strip 5C was finally produced as a thin plate, but it is also possible to produce a thick plate by selecting a mold.

As described above, in the present invention, both thin plates and thick plates can be manufactured, so by arbitrarily selecting the number of crushing rolls and rolling mills to be installed and devising the shape of each roll, the process shown in FIG.
It is also possible to manufacture the mold material as shown in the following.

Although the embodiment shown in FIG. 1 is an equipment for producing rolled material that continuously operates casting and rolling, the present invention can produce strips, plates, and other materials by only casting.

Figure 8 is an example of an existing mold type continuous casting machine that casts the slabs shown in Figure 4, which has been modified to produce cast strips and cast plates by adding crush rolls 6 and 7 and crop shears 9. .

[Effects of the Invention] As described above, according to the method and apparatus for continuously manufacturing metal pieces of the present invention, ■ An unsolidified slab with a large cross-sectional area is cast and the cross-section is reduced by crushing, so that the molten metal Defects such as cracks, scratches, and wrinkles due to uneven solidification are eliminated, improving product quality.

<n> Casting can be easily crushed into the required small cross-sectional shape, so strips, thick plates, shapes, etc. can be directly manufactured just by the process of casting and roll crushing, and large cross-sectional slabs can be reduced to small cross-sectional areas. The rolling process of rolling can be omitted.

[Phase] Compared to conventional casting machines that completely solidify cast large cross-sections with the same cross-sectional area, the cross-sectional area is reduced by one pressure dip, so the cooling device can also be shortened.

(2) By cooling the surface of the crushing roll with water from inside the roll, it is possible to speed up the cooling and solidification of the slab, and furthermore, the length of the cooling device can be shortened.

■ If finishing rolling is performed after the casting and roll crushing steps, a product of better quality can be obtained.

■ As described above, compared to conventional manufacturing equipment, according to the present invention, the equipment is smaller and the construction cost, manufacturing cost, labor, maintenance cost, etc. can be significantly reduced compared to the conventional equipment, and small-scale equipment can be used. We can manufacture finished products.

■ Existing continuous casting machines and technology can be used to cast unsolidified slabs, so by modifying the existing mold type continuous casting machine and adding crush roll equipment and cooling equipment, it is possible to diversify the product types and Production can be rationalized.

It can produce excellent effects such as

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the continuous metal piece production apparatus of the present invention, Fig. 2 (A) to (E) are diagrams showing changes in cross-sectional shape, and Fig. 3 (A) to (G) are the apparatus of the present invention. Figure 4 is an explanatory diagram of a conventional mold type casting machine, and Figures 5 to 7 are explanatory diagrams of recently considered casting machines. , FIG. 8 is a schematic diagram of a continuous casting apparatus of the present invention, which is a modification of the casting machine of FIG. 4. 1 is a mold, 3 is a molten metal, 4.8.8A is a cooling water spray device, 5A is an unsolidified slab, 5B is a fully solidified slab,
5G is a hot strip, 6 and 7 are crush rolls, io,
1i indicates a rolling mill.

Claims (1)

[Claims] 1) Cooling the molten metal in a mold to cast an unsolidified slab with a large cross-sectional area, releasing the slab adhering to the mold, and transferring the slab with rolls. 1. A continuous production method for metal pieces, characterized by continuously casting slabs with a small cross-sectional area by crushing them to reduce their cross-sectional area and shaping them into a desired cross-sectional shape. 2) A mold-type continuous casting machine that cools molten metal and casts unsolidified slabs, and also releases the adhered slabs from the mold, and crushes the slabs while transporting them backwards to reduce the cross-sectional area. 1. An apparatus for continuously manufacturing metal pieces, comprising: a crushing roll device that reduces the amount of cast pieces and shapes them into a required cross section, and a cooling device that cools and solidifies the cast pieces. 3) A mold-type continuous casting machine that cools molten metal and casts unsolidified slabs, and also releases the adhered slabs from the mold, and crushes the slabs while transporting them backwards to reduce the cross-sectional area. Continuous production of metal pieces, characterized by comprising: a crush roll device that reduces the amount and shapes the slab into a desired cross-section, a cooling device that cools and solidifies the slab, and a rolling device that rolls the cast slab into the required cross-sectional shape. Device.