JPH049073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the mold structure of a horizontal continuous casting apparatus, particularly to an improvement of an electromagnetic stirring mold.

(Prior Art) FIG. 3 shows a conventional horizontal continuous casting electromagnetic stirring mold structure.

A water jacket b is combined with the outside of the mold tube a on the horizontal axis, and an electromagnetic stirring device consisting of an electromagnetic stirring coil c is arranged outside the water jacket b.
A horizontal molten steel flow e is injected into this water-cooled horizontal mold from a pouring nozzle d on the tundish side to form a solidified shell f, and casting is performed.

When the electromagnetic stirrer is operated, the rotating magnetic field generated causes the unsolidified molten steel to become a stirred rotating flow g.
Defects such as asymmetric solidification can be improved.

(Problems to be Solved by the Invention) In the electromagnetic stirring mold of the prior art, as shown in the upper part of FIG. The magnetic velocity density has a distribution as shown in the lower diagram of FIG. That is, the magnetic velocity density is maximum at the center of the coil, but is small at the entrance of the mold tube. Therefore, since the maximum stirring force is generated at the center of the coil and the stirring force at the inlet is small, this affects the initial solidification of the solidified shell, causing problems such as deterioration of the surface quality of the slab and deepening of the cold shaft. Problems will remain.

In addition to these problems, electromagnetic stirring molds used in horizontal continuous casting are not only exposed to high temperatures but also receive pressure (dragging force) from molten steel. At present, no mold casting with this property has been found.

The object of the present invention is to provide a horizontal continuous casting electromagnetic stirring mold structure that can solve these problems of the prior art.

(Means for Solving the Problems) The present invention to achieve the above object includes surrounding the outer periphery of the mold tube with a water jacket, surrounding the outer periphery of the water jacket with an electromagnetic stirring coil, Further, in an electromagnetic stirring mold for horizontal continuous casting in which a front end of the mold tube and a front end of the water jacket are located inside an electromagnetic stirring coil, a flange provided at the front end of the mold tube and the water jacket are provided. A cooling channel is formed to cool the flange by contacting the front end of the jacket, and a pouring nozzle is fitted to the surface of the flange on the side opposite to the cooling channel via a break ring, and a spring is fitted thereto. It is characterized by being held with fixed pins.

(Function) A water jacket surrounds the outer periphery of the mold tube of the horizontal continuous casting device, and an electromagnetic stirring coil surrounds the outer periphery of the water jacket, and the front end of the mold tube and the water jacket By locating the front end of the electromagnetic stirring coil inside the electromagnetic stirring coil, the vicinity of the coil center where the magnetic flux density is high can be located at the entrance of the mold tube, thereby increasing the magnetic flux density at the entrance part and , it is possible to make the mixture uniform, and the stirring power can be increased.

In other words, by increasing the stirring force,
Cold shatter can be reduced and slab yield can be improved, and quality can be improved by promoting uniform solidification shell formation and productivity can be improved by reducing breakout. Furthermore, the surface properties of the slab can be improved.

In addition, the present invention is particularly suitable for continuous casting of steels, which require large stirring forces at the entrance of the mold tube where the molten steel begins to solidify due to their slow solidification rates.

Furthermore, the cooling channel formed in the flange of the mold tube cools the entire mold tube evenly and effectively, including the flange, and the spring prevents the mold tube from being blown by the pressure of the molten steel (which is dragged in the axial direction). elastically supported against force).

(Example) Hereinafter, the present invention will be specifically explained with reference to an example shown in FIGS. 1 and 2. FIG. 1 is a longitudinal sectional side view of an electromagnetic stirring mold according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional side view of the mounting structure of the inlet of the mold tube.

A stainless steel water jacket 2 is coupled to the outer periphery of the copper mold tube 1 to form cooling channels 2A and 2C between them so that the entire mold is water cooled, and an electromagnetic stirring coil 3 is housed on the outer periphery. Fit the mold frame 4 and mold tube 1.
Electromagnetic stirring is applied to the molten steel inside.

Hereinafter, the right side in the figure where the tundish tray 5 is located will be described as the front side.

The mold frame 4 is constructed by connecting a lid part 7 to the front end of a main part 6 with bolts 8 indicated by the center line. The lid part 7 has a cylindrical part 9 extending rearward on the inner periphery, and a water jacket 2 extending further rearward from the rear edge of the cylindrical part 9.
It is formed by A flange 1 at the entrance of the mold tube 1 is attached to the front surface of the water jacket 2 on its inner periphery.
0 are in contact with each other, especially the flange part 1.
A cooling water channel 2C is formed which communicates with the cooling water channel 2A via a communication path 2B so that the cooling water can be cooled down to zero. Thereby, the entire mold tube 1, including the flange portion 10, can be cooled evenly and effectively.

Then, the mold fixing flange 12 with the cylinder part 11 is brought into contact with the front surface of the flange part 10 at the rear edge of the cylinder part, and by attaching the mold fixing flange 12 to the front surface of the lid part 7 with bolts 13, the mold tube flange part 10 is attached to the water diaphragm. It is clamped and fixed between the butt 2 and the mold fixing flange 12. In this way, the entrance of the mold tube 1 is positioned inside the electromagnetic stirring coil 3. Mold fixing flange 12
At the rear of the mold fixing flange 12, fixing pins 14 extending toward the front are distributed and arranged in a circumferential direction to fix the mold fixing flange 12. Fit the pouring nozzle fixing plate 15, disc spring 16, and presser washer 17 to the fixing pin 14 in this order, and tighten the nut 18 to the front end of the fixing pin 14 to secure the mold tube 1.
The mold assembly is completed by sandwiching the break ring 19 and the flange portion 21 of the pouring nozzle 20 between the inlet and the pouring nozzle fixing plate 15 by spring force. As a result, the spring 16 can be adjusted to apply an appropriate pressing pressure to the contact area between the entrance of the mold tube 1 and the break ring 19, and the mold tube 1 can be adjusted to maintain its position even when subjected to an axial dragging force from the molten steel. can be elastically supported against.

As a modification, the shape of the electromagnetic stirring coil can be made as short as possible in the casting direction to bring the mold tube entrance and the coil center closer together.

(Effects of the invention) According to the invention, even the flange of the mold tube that is exposed to high temperatures can be cooled, so the entire mold tube can be cooled evenly and effectively, and the mold tube can also be cooled against the drag force from molten steel. As a result of enabling elastic support, it is possible to obtain an electromagnetic stirring mold for horizontal continuous casting that has a simple structure and high reliability.

In addition to the above effects, the outer periphery of the mold tube of the horizontal continuous casting device is surrounded by a water jacket, the outer periphery of the water jacket is surrounded by an electromagnetic stirring coil, and the front end of the mold tube is Since the front end of the water jacket is located inside the electromagnetic stirring coil, the magnetic flux density at the entrance of the mold tube can be increased and the stirring force can be increased, resulting in the following casting results. be able to.

() Slab yield can be improved by reducing cold shatter.

() Improved quality by promoting uniform solidified shell formation and improved productivity by reducing breakouts.

() The surface properties of the slab are improved, resulting in improved quality.

() Particularly suitable for continuous casting of steel, which requires a large stirring force at the entrance of the mold tube where molten steel begins to solidify.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of an electromagnetic stirring mold for horizontal continuous casting according to an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the mounting structure of the inlet of the mold tube, and Fig. 3 is a horizontal sectional side view of a conventional horizontal continuous casting mold. FIG. 4, a longitudinal side view of the electromagnetic stirring mold, is an explanatory diagram showing the positional relationship between the electromagnetic coil and the mold tube in the upper part, and the magnetic flux density corresponding to the position in the lower part. DESCRIPTION OF SYMBOLS 1... Mold tube, 2... Water jacket, 2A, 2C... Cooling channel, 3... Electromagnetic stirring coil, 4... Mold frame, 5... Tandate, 6... Main part, 7... Lid part , 8...Bolt, 9
... cylinder part, 10 ... flange part, 11 ... cylinder part,
12... Mold fixing flange, 13... Bolt, 1
4...Fixing pin, 15...Pouring nozzle fixing plate, 1
6...Disc spring, 17...Washer, 18...Nut, 19...Break ring, 20...Pouring nozzle, 21...Flange section, a...Mold tube, b...Water jacket, c... ...Electromagnetic stirring coil, d...Pouring nozzle, e...Horizontal molten steel flow,
f... Solidified shell, g... Stirring rotational flow.

Claims (1)

[Scope of utility model registration request] The outer periphery of the mold tube is surrounded by a water jacket, the outer periphery of the water jacket is surrounded by an electromagnetic stirring coil, and the front end of the mold tube and the front end of the water jacket are surrounded by an electromagnetic stirring coil. In an electromagnetic stirring mold for horizontal continuous casting located inside the mold tube, a flange provided at the front end of the mold tube and the front end of the water jacket are brought into contact to form a cooling channel for cooling the flange. An electromagnetic stirring mold for horizontal continuous casting, characterized in that a pouring nozzle is held by a fixing pin fitted with a spring on the surface of the flange portion on the side opposite to the cooling water channel via a break ring.