JPS6156756A - Belt type continuous casting equipment - Google Patents

Abstract

PURPOSE:To stabilize the operation and improve the productivity while preventing the burn of a casting mold and the seizure to solidified shells by moving back and forth the short side molds sandwiched by both ends of the opposed surfaces of casting mold belts in the moving direction of a slab and passing cooling water to the inside of the short side molds. CONSTITUTION:Forward and backward motion is applied to reinforcing members 3b of the short side molds via connecting rods 3e when a crankshaft 3f is rotated. The members 3b are restrained in the movement in two directions near both ends thereof by guide members 3c, 3d and therefore the members 3b move stably and linearly. A molten metal 5 flows through a nozzle 4c and a spout 4d into a mold region when said metal is poured into the pouring port of the tundish 4a of a pouring device 4. The solidified shell grow quickly from the surfaces of the belts and the short side mold cooling members 3 by which the slub 7 is cast.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a belt-type continuous casting apparatus particularly suitable for continuous casting of steel plates.

[Conventional technology]

There are two types of belt-type continuous casting equipment currently in use: a mobile type and a fixed type. Used for casting thick slabs.

(Mobile type) Typical mobile belt type continuous casting device 1Fr: Explaining based on Fig. 5 and Fig. g6, Fig. 5 is a side view of the device, and Fig. 6 is a central vertical longitudinal section of the device. It is a diagram.

In FIGS. 5 and 6, a mold belt 101 is wound around a pair of pulleys 102 and tension is applied to it, and one of the pair of pulleys 102 is connected to a rotational drive source (not shown). ing. A pair of cast belts 101
The back surface of the opposing surface is in contact with the cooling water, and both ends of the opposing surface are sandwiched between the movable short side molds 105f. The movable short-side mold 105 is made up of small blocks connected in an endless row, and in the area sandwiched by the mold belt 101, the gap between the connecting surfaces between the small blocks is to the extent that it does not affect the size of a metallizer (02
It is kept below hot. The water flows out from the tundish (not shown) and flows through the gutter 104 through the upper opening to the mold area.

In this mold area, the bath water is removed from the mold plane by heat, forming a solidified shell and moving together with the mold belt 101 and the movable short mold 103.

The thickness of the solidified shell increases as it moves downstream, and finally the pieces grown from each mold plane coalesce to form the slab 107. In addition, in the M5.6 diagram, 101a is the mold belt 1
01 is the movement direction, 102a is the rotation direction of the pulley 102,
105a is the moving direction of the movable short side mold 103, 107a
indicate the moving direction of the slab 107, and 106
is the solid-liquid interface.

(Fixed type) On the other hand, a typical fixed type belt type continuous casting device will be explained based on Figs. 7 and 8. Fig. 7 is a side view of the device, and Fig. 8 is a side view of the device. Medium, 19″*i**ia't'
s, b. In FIGS. 7 and 8, a fixed short side mold 203 sandwiched between opposite ends of a pair of mold belts 201 is fixed to a frame. A cooling water passage is provided inside the fixed short side mold 203 and connected to an external water supply and drainage pipe. In addition,
The mold belt 201, pulley 202, etc. are the same as those of the movable type. The solidified shell generated in the casting region moves downstream together with the mold belt 201 or moves to the fixed short side mold 20.
Since 5 is fixed, there is a gap between the solidified shell and the short side mold. The process of pouring and producing slabs is the same as the moving type, and 201a is the moving direction of the mold belt 201, 202
a indicates the rotating direction of the pulley 202, 207a indicates the moving direction of the slab 207, and 204 and 205
is the molten metal, and 206 is the solid-liquid interface.

(Disadvantages of the device consisting of a movable short-side mold) In the belt-type continuous casting device consisting of the movable short-side mold shown in Fig. 5.6, the mold consists of components consisting of small blocks,
Since this component moves, it has the disadvantage that it is difficult to supply cooling water to it. This is especially true for continuous casting of molten high melting point metals such as steel.
is easily overheated and burnt out, and its thermal deformation also increases, making it difficult to maintain the connection surface clearance between adjacent components (small blocks) to less than [L2+m, which is a drawback in that it is easy to cause boiling. have. Since the cooling effect on the bath water is weak, the growth rate of the solidified shell from the mold surface is low, which is a constraint when trying to increase the total casting speed, especially in thick slabs. Furthermore, seizure is likely to occur at the interface between the component (small block) and the solidified shell.

Seizing can induce large forces and damage the solidified shell when they separate at the lower opening of the mold area.

(Disadvantages of the device consisting of a fixed short-side mold) In the belt-type continuous casting device consisting of the fixed short-side mold shown in Fig. 7.8, frictional force is generated at the interface between the initially solidified shell and the fixed short-side mold. As a result, the upstream side of the broken solidified shell adheres and remains on the surface of the short side mold, becoming an isolated solidified substance, which inhibits the normal generation of solidified shells thereafter. On the other hand, on the downstream side of the fractured solidified shell,
As it advances, a new solidified shell is generated upstream of it.

When the solidified shell fracture occurs near the lower opening of the mold, the accompanying solidified shell is insufficiently grown and exits the mold area, unable to withstand the static pressure of the bath water and ruptures, resulting in a breakout.
ak out) This will result in an accident. Although the upstream and downstream parts of the fractured and solidified shell may be re-united, this has the drawback of producing slabs with poor surface quality, such as wrinkles and double skin.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to provide a belt-type continuous casting apparatus which eliminates all of the drawbacks of the conventional apparatus. That is, an object of the present invention is to provide a belt-type continuous casting apparatus in which molten metal and initially solidified shells are less likely to adhere to the short-side mold, and in which the surface of the #11 mold can be sufficiently cooled. do.

[Means for Solving the Problems] The present invention, as a means for achieving the above object, consists in making the short side mold reciprocate in the direction of the t-slab and in causing cooling water to flow inside the mold. .

That is, the present invention provides a belt-type continuous casting apparatus in which melt is poured into a short-side mold sandwiched between opposing end portions of a pair of mold belts, and is cooled by the flat surface of the mold to continuously cast slabs. A belt-type continuous casting apparatus characterized in that a short-side mold sandwiched between opposite ends of the mold belt is reciprocated in the direction of slab movement, and cooling water is fully circulated inside the short-side mold. be.

In the present invention, a pair of mold belts are formed into an endless shape, and a mold plane is formed by winding the belts around a plurality of pulleys and applying tension. The mold planes of the pair of mold belts are arranged opposite to each other, sandwich the short molds near both ends, and reciprocate in the same direction as the slab.

The mold region of the present invention consists of four surfaces: mold planes of two mold belts facing each other, and mold planes of two short-side molds facing each other, and these four
Surface force, the upper and lower sides of the surrounding area are open. A pouring device (such as a spout or nozzle) is installed near the upper opening of the mold, and bath water is poured into the mold through the upper opening of the pouring plate.

The bath water is then cooled by the mold plane and the resulting solidified shell exits through the lower mold opening.

In the present invention, the short-side mold is reciprocated in the direction of movement of the entire slab, and cooling water is caused to flow inside the mold,
This makes it difficult for bath water and initially solidified shells to adhere to the short-side mold, and the mold surface is sufficiently cooled. As a result, the casting speed can be increased, production capacity is increased, troubles such as breakouts are reduced, and operations are stabilized and production rates are improved.

Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 4.

Fig. 1 is a side view of a belt-type continuous casting machine that is an embodiment of the present invention, Fig. 2 is a central vertical cross-sectional view of the machine, and Fig. 3 is a detailed view of the short-side mold and surrounding members in the same machine. There it is,
Figure 4 ■-ff line location diagram p1 Figure 4 is Figure 3 1-1
FIG. In addition, in FIGS. 3 and 4, the tundish, upper mold belt, and pulley are removed to make it easier to see the short-side mold, its support mechanism, and drive mechanism.

In FIGS. 1 to 4, a cooling member 5 and a reinforcing member 3b of a reciprocating short-side mold are sandwiched between opposite ends of a pair of mold belts 1. In the present invention, it is desirable to use all materials with high thermal conductivity, such as copper alloys with a high copper content, as the cooling member, and to use high-strength and high-rigidity materials, such as steel, as the reinforcing member. is desirable.

A cooling water channel 3a is formed between the cooling member 3 and the reinforcing member 5b. The cooling water channel 5a communicates with an external water supply and drainage pipe.

The reinforcing member 5b is held at both ends by guide members 5c, 5(1), but this holding does not restrict movement in the longitudinal direction.

One end of a connecting rod 5e is connected to the upstream end of the reinforcing member 5b. The other end of the connecting rod 38 is connected to the crankshaft 3f. The crankshaft 5 is rotatably supported by a bearing member 3g fixed to a frame. crankshaft 3
A glazed joint 3h is attached to one end of f. The shaft coupling 5hi is connected to a rotational drive source (not shown).

A tundish 4a is disposed upstream of the upper opening of the caster. The tundish 4a is provided with an injection port 4b, a nozzle 4c, and a negative pressure suction port, that is, a pressure reduction port 4e.

A grate 4d is installed below the tundish nozzle 4C, with its lower end facing toward the upper opening of the entire mold.

In the above device, when the crankshaft 5ff is rotated by a rotational drive source (not shown), the connecting rod 5 of the crankshaft 5
reciprocating motion is applied to the reinforcing member 3b of the short-side mold through the reinforcing member 3b.Since the reinforcing member 3b is fully restrained from moving in two directions by the guide members 3c and 5d near both ends of the reinforcing member 3b,
The reciprocating motion of b is a stable linear motion.

If not shown, the tundish 4, which is the pouring device 4 from the cube.
When the bath water 5 is poured into the injection port 4b of a, the bath water 5 flows into the mold region through the nozzles 4c and 4d. Therefore, a solidified shell rapidly grows from the surfaces of the mold belt 1 and the short-side mold cooling member 3, and the slab 7' (il-casting is performed.
is the solid-liquid interface.

In the reciprocating type short side mold which is the apparatus according to the embodiment of the present invention, the solidified shell and the short side 8 are similar to the case of the fixed type short side mold.
Frictional force is generated at the interface of the bases.

However, as has been experienced in many continuous casting facilities, the solidified shell is difficult to break during reciprocating parts. The reason for this is thought to be due to the synergistic effect of reducing frictional force, strengthening the solidified shell, and repairing the fractured surface.

〔Effect of the invention〕

As described in detail above, the present invention has a short-side mold that is reciprocated in the direction of movement of all slabs and has cooling water flowing inside the mold, that is, a reciprocating mold that has cooling water flowing inside the mold. Since the movable short-side casting mold has a weeping metal cast, unlike the conventional mobile short-side mold, there is no dividing surface (connecting surface of the small block), so the whole surface of the hot water drain on the casting surface does not exist. In addition, compared to the conventional movable short side mold, the growth rate of the solidified shell on the mold surface is faster, resulting in the effect of increasing the casting speed.Furthermore,
Even in continuous casting of high-melting point materials such as steel, the present invention eliminates mold burnout due to overheating and seizure with the solidified shell, unlike conventional movable short-side casting, and eliminates the problem of conventional fixed type casting. Compared to short-sided molds, the initially solidified shell is less likely to break, resulting in stable operations and improved productivity.

[Brief Description of the Drawings] Fig. 1 is a side view of a belt-type continuous casting apparatus which is an embodiment of the present invention, Fig. 2 is a central vertical cross-sectional view of the apparatus, and Fig. 3 is a short side mold in the same apparatus. and a detailed view of peripheral members,
FIG. 4 is a sectional view taken along the line 1-11, and FIG. 4 is a sectional view taken along the line I-1 of FIG. 3. FIG. 5 is a side view of a conventional belt-type continuous casting apparatus comprising a movable short-side mold, and FIG. 6 is a central vertical cross-sectional view of the apparatus. FIG. 7 is a side view of a conventional belt-type continuous casting apparatus having a fixed short-side mold, and FIG. 8 is a central vertical cross-sectional view of the apparatus. 1.101,201--Mold belt 2.102,202--Zuri, 5.. Short side cooling member, 5a.. Cooling water channel, 31).. Reinforcing member, 6C.. Guide member, 5d.. Guide member, 3e...connecting rod,
3f...crankshaft, 5g...bearing member,
5h...Shaft coupling, 103...i-moving short side mold, 205...Fixed type short side mold, 4--pouring device, 4a--tundish, 4b
...Inlet, 4CΦ・Nozzle, 4d...
413m - Decompression port, 5.105,205・
-4L 6.106,206...Solid-liquid interface, 7.107.207...Slab agent 1) Akifuku agent Ryo Hagiwara - Figure 8 January 7, 1985

Claims (1)

[Claims] In a belt-type continuous casting device, in which melt is poured into a short-side mold sandwiched between opposite ends of a pair of mold belts, and is cooled by the flat surface of the mold to continuously cast slabs, A belt-type continuous casting device characterized in that a short-side mold sandwiched between both ends of the surface is reciprocated in the direction of slab movement, and cooling water is allowed to flow inside the short-side mold.