JPS61202751A - Method and device for continuous casting - Google Patents

Abstract

PURPOSE:To cast thin and thick plates at a high speed by cooling a molten metal with the peripheral surface of rolls to cast an ingot in an unsolidified state, cooling and crushing further the ingot by >=1 pairs of rolls and forming and solidifying the ingot to a required shape. CONSTITUTION:The molten metal is poured into a tundish 1 and the molten metal is solidified at the top end of a plug. A dummy bar is retreated and the unsolidified ingot 23 is drawn out of a casting roll device 2 when the solidified shell is formed to a substantial thickness. After the plug passes through the 1st forming and cooling roll device 6, the space of a bulging preventive device 16 is matched with the roll gap of casting rolls 3, 5 and while the rolls 7, 8 are rotated in synchronization with the speed of the rolls 3, 5, the roll gap is decreased to crush the ingot 23. The forming rolls 10, 11 are further rotated at the synchronous speed to decrease the roll gap after the plug 2 passes through the 2nd forming and cooling device 9. The plug is cut and separated by operating the rolls 3, 5, 7, 8, 10, 11 at the low speed in the above-mentioned manner. The dummy bar is retreated from the casting line and the normal operation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a highly productive continuous casting apparatus capable of casting thin and thick products at high speed.

[Prior Art] Typical conventional continuous casting devices include twin roll type continuous casting devices and mold type continuous casting devices. The twin roll type is, for example, a cold W roll a whose interior is water-cooled, as shown in Fig. 7.

Molten metal is supplied from a tundish nozzle d to a sump chamber C surrounded by flanges b provided on both sides of one cooling roll, and the molten metal is cooled and solidified by contacting the circumferential surface of the rotating cooling roll. , a slab e having a set thickness is continuously cast and sent out from the roll gap.

The mold type includes the vertical continuous & V machine (see Fig. 8) and the horizontal continuous casting V11 (see Fig. 9). Q to form a solidified shell 22 on the outer periphery of the slag 25 (see Fig. 3), and move the unsolidified slab whose inside of the solidified shell 22 is still in a molten state along the bulging prevention support roller i. Meanwhile, water is sprayed onto the outer periphery of the slab from a nozzle, and a slab J with completely solidified inner and outer components is cast.

In order to move the unsolidified slab, the vertical type shown in Fig. 8 vibrates the mold Q in the vertical direction (arrow k), releases the solidified shell 22 that has formed on the inner surface of the mold Q, and uses gravity. and let it hang down. In addition, in the horizontal type shown in Figure 9, the slab j is rolled in a vinyl roll! The unsolidified slab is pulled intermittently using the mold to move it away from the mold opening.

In addition, in the figure, n indicates a drop and p indicates a solidified shell.

[Problems to be solved by the invention] However, the twin roll type (Fig. 7) has a structurally small ability to remove heat by cooling and solidifying molten metal, so it can only produce #R thin objects such as strips. However, there was a problem in that it was not possible to cast thick plates, billets, other thick objects, molded objects, etc.

In addition, the mold type (Figs. 8 and 9) requires a large amount of feed because it is necessary to prevent the hot water from leaking when releasing the unsolidified piece from the mold, that is, to prevent the solidified shell 22 from breaking. Therefore, the casting speed was low, resulting in low productivity.

[Means for Solving the Problems] In view of the above-mentioned problems, the present invention was made to cast thin products, thick products, molded products, etc. at high speed. Continuously casting slabs in an unsolidified state by cooling them on the peripheral surface, cooling and crushing the cast slabs using at least one pair of rotating rolls, forming them into the desired cross-sectional shape, and solidifying them. It is something that makes you

[Function] (1) The molten metal is cooled by contact between the circumferential surface of the rotating casting roll and the molten metal, forming a solidified shell around the outer periphery of the basin to produce an unsolidified slab.

(2) When the unsolidified slab is crushed and formed using a rotating O-roll, the thickness of the solidified shell is mainly cooled by the arcuate surface of contact between the roll and the solidified shell. At the same time, the hot water in the unsolidified slab is extruded by crushing and decreased by cooling and solidifying.

(3) Form the slab into the desired cross-sectional shape by crushing.

[Embodiments] Hereinafter, the principle and embodiments of the present invention will be explained with reference to FIGS. 1 to 5. In order to increase the heat removal capacity for solidifying the unsolidified pieces and increase the moving speed of the unsolidified pieces, the present invention has established a completely novel method of cooling and molding the unsolidified pieces while crushing them. The method of the present invention includes:
This method produces unsolidified slabs with a large cross-sectional area using a casting O-ru installation, and cools the unsolidified slabs with a forming cooling roll device that has a large heat removal capacity, thereby casting the slabs at high speed. In addition, compared to the water spray of conventional casting 8281, the forming roll directly contacts the arcuate surface of the slab to cool and remove heat.
The slab solidifies quickly, and the overall length of the equipment can be shortened accordingly. That is, a casting roll W2 having sufficient heat removal capacity is provided on the outlet side of the tundish 1, and a solidified shell 22 having a thickness that is not destroyed by bulging is formed on the outer periphery of the unsolidified slab 23 (Fig. 3). ), the unsolidified slab 23 is crushed using a forming cooling roll device 6.9, and when crushed, it directly contacts the unsolidified slab 23, increasing the thickness of the solidified shell 22 and shaping it into the desired shape. (See Figures 4 and 5). The forming cooling roll devices are installed in the number of buses necessary for cooling the unsolidified slab and forming its cross section.

One casting roll @I! The feeding speed between the unsolidified slab 2 and the forming cooling roll device B6.9 and the forming cooling roll device B6.9 is
3 at the same speed so that they do not break, i.e. do not go into tension or compression. In addition, when sending a slab with a thick shell, it may be rolled and formed to the extent that the shell does not break.In short, the casting roll device creates an unsolidified slab from the molten metal, and the outer peripheral surface of the forming cooling roll is Crush the uncoagulated pieces,
By crushing, the outer peripheral surface of the roll and the unsolidified slab come into contact with each other in an arc, thereby increasing the contact area, rapidly cooling the slab, and adjusting the cross-sectional shape.

Note that crushing here means changing the shape of the solidified shell without changing its cross-sectional area. When crushed, the cross-sectional area of the slab, that is, the unsolidified part, decreases, and the hot water is pushed back to the inlet side. . On the other hand, rolling reduces both the hot water of the unsolidified piece and the cross-sectional area of the solidified shell, the molten metal is pushed back to the entry side, and the reduced area of the shell advances to the exit side. The exit speed is greater than the entrance speed.

A horizontal continuous casting apparatus, which is a first embodiment of the present invention, will be explained with reference to FIGS. 1 to 5. In the figure, 1 is a tundish for storing molten metal, 2 is a casting roll device 6 which is a combination of an internally cooled cylindrical casting roll 3 and an internally cooled flanged casting roll 5 having flanges 4-1 on both sides. 9 is a first forming cooling roll device which is also composed of a pair of internally cooled forming rolls 1.8 and is provided with flanges 4-2 on both sides of the forming roll 8, and 9 is also a forming roll 10.
．． 11 and 7 langes 4- on both sides of the forming roll 11.
3, the casting roll device 2, first and second forming cooling roll devices 6.9;
are arranged horizontally from the inlet side of the lagoon to the outlet direction.

A required number of bulgings are provided between the casting roll device 2 and the first forming cooling roll device 6, between the first and second forming cooling roll devices 6゜9, and on the downstream side of the second forming cooling N10-roll device 9. Prevention nabor roller 13, water spray 14, piping 15
Bulging prevention devices 16, 17, and 18 are respectively arranged.

In addition, the forming rolls 7.8 and 9.10 have holes machined by the roll body surface and the 7 flange so as to form the cross section of the slab shown in FIGS. 4 and 5. ,5
Also, like the forming roll, it is processed into a hole shape.

Next, the operating method and operation of the continuous casting apparatus shown in FIG. 1 will be explained. When starting casting, as shown in FIG. 16, 17, and 18, a dummy par 19 is inserted into this gap, and a dummy bar plug 20 is used to plug the roll gap of the casting roll device 2.

Next, hot water is poured into the tandish 1 and the hot water is solidified at the tip of the plug 20. At this time, the casting roll 3.5 is rotated at a low speed depending on the situation. When the lagoon adheres to the tip of the plug 20 and a sufficiently thick solidified shell (shown by hatching) is formed, the dummy roller 1 is placed in synchronization with the speed of the casting roll 3.5.
9 is retracted, the unsolidified slab 23 is pulled out from the casting roll device 2, and the plug 20 passes through the first forming cooling roll device 6, and then the spacing of the bulging prevention device 16 is aligned with the roll gap of the casting roll 3.5. At the same time, while rotating the forming roll 7.8 in synchronization with the speed of the casting roll 3.5, the roll gap was reduced to the state shown in FIG.
Crush 3.

Further, after the plug 20 has passed through the second forming cold roll device 9, the forming rolls io and 1i are rotated at the synchronous speed in the same manner as described above, and the spacing of the bulging prevention device 11 and the roll gap of the forming rolls 10.11 are adjusted. It is reduced to the state shown in Figure 1. Thus, rolls 3, 5, 7, 8, 10
．． 11 is operated at low speed, the plug 20 is cut and separated from the slab, and the dummy par 19 is evacuated from the casting line. After that, all the rolls 3, 5, 7, 8, 10, and 11 are accelerated and normal operation begins. In addition, when sending out the unsolidified slab 23, each bulging prevention device 16, 17, 18 is activated and water is sprayed to cool the unsolidified slab 23.

A vertical arrangement according to a second embodiment of the present invention is shown in FIG. In this example, casting rolls 3a, 5a.

Each roll stand consisting of forming rolls 7a, 8a, 10a, 11a and bulging prevention devices 16a, 17a
, 18a are arranged vertically, and the unsolidified slabs 23 are sent out vertically from above to below. Further, the casting roll device 2a and the tundish 1a are separated, and the water injected from the tundish 1a is transferred to the casting rolls 3a, 5.
After being stored in a heating cloth 'g24 surrounded by the circumferential surface a and flanges 4a on both sides, it is sent to the casting roll device 2a, and other than that, there is no difference from the first embodiment.

IC: It goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications may be made without departing from the spirit of the present invention.

1. Effects of the invention] As described above, the present invention provides the following excellent effects.
do.

(1) This device is a roll type, and can cast at a higher speed than conventional mold types, resulting in higher productivity.

(2) Equipped with a forming cooling roll device and high heat extraction capacity, unlike the conventional twin roll type, it can cast thick objects and molded objects, as well as thin objects, as would be cast with a mold method.

(3) Since the forming cooling roll device rapidly cools the slab through circular arc contact through crushing, it has a greater heat removal capacity than the conventional mold type, and the overall length of the continuous casting device can be shortened.

(4) Since horizontal continuous VI construction is possible, the foundry can be configured compactly.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, FIG. 1 is a side view of a horizontal continuous casting apparatus, FIG. 2 is an explanatory diagram of the procedure for starting the operation of the apparatus shown in FIG. 1, Figures 3 to 5 are slab (1) III-I11 direction and IV in Figure 1.
-IVh direction, V -V direction jp la (D arrow view, 6th
The figure is a cutaway side view of a vertical continuous RM manufacturing apparatus which is a second embodiment of the present invention, and Figures 7 to 9 are explanatory diagrams of conventional continuous casting apparatus. Figure 8 shows the vertical type, and Figure 9 shows the horizontal type. In the figure, 3 and 3a are casting rolls, 5.5a is a flanged casting roll, 7, 8, 10. '11 indicates a forming roll.

Claims (1)

[Claims] 1) Molten metal is cooled on the circumferential surface of a rotating roll to continuously cast unsolidified slabs, and the cast slabs are continuously cast. A continuous casting method characterized by cooling and crushing a cast slab using at least one pair of rotating rolls, forming it into a desired cross-sectional shape, and solidifying it. 2) A tundish for sending out molten metal, a casting roll device disposed adjacent to the outlet side of the tundish, and at least one pair of forming cooling roll devices disposed downstream of the casting roll device. Continuous casting equipment. 3) According to claim 2), the casting roll device and the forming cooling roll device are arranged substantially horizontally on the exit side of the tundish, and the casting roll device is tightly connected to the tundish via a tundish nozzle. Continuous casting equipment as described. 4) The continuous casting apparatus according to claim 2) or 3), wherein a bulging prevention device is provided in the passageway of the unsolidified slab.