JP3342583B2 - High frequency heating coil for horizontal continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention relates to metals such as iron, copper,
The present invention relates to a high-frequency heating coil for continuous continuous casting of lead, aluminum, nickel, precious metals, and the like and alloys thereof.

[0002]

2. Description of the Related Art A high frequency heating coil for continuous casting is widely used for holding a raw material metal in a heated and melted crucible, but it is energy efficient, easy to control temperature, easy to automatically control, and especially polluting. This is because it has an excellent feature that there is little worry about the problem. 2. Description of the Related Art Conventionally, a high frequency heating coil used in the above field is generally a cylindrical coil wound around a crucible at equal intervals, and its use mode differs depending on the type of the crucible.

[0003] There are two types of such crucibles for continuous casting, a vertical crucible and a horizontal crucible, depending on the method of drawing out a product. In the case of a vertical crucible, a die is formed on the side wall to draw out the product from the bottom of the crucible and cooling is performed. There is no jacket, and the entire crucible can be surrounded and uniformly heated and held by the conventional high-frequency heating coil.

In the case of a horizontal crucible, a product is drawn out horizontally or obliquely from a side wall. For example, as shown in FIG. 3, casting using a conventional high frequency heating coil for horizontal continuous casting is performed. In the apparatus, the raw metal that has been heated and melted is put into a crucible 1, heated and held by a cylindrical coil 2, and the molten metal 3 is passed through a die 6 surrounded by a hot water supply port 4 and surrounded by a cooling jacket 5 and in contact with a lower portion of the crucible side wall. A product which is drawn out to become a product 7 is known.

[0005]

However, in the case of the horizontal crucible, as shown in FIG.
Since the lower part of the crucible cannot be surrounded by the die 6 and the cooling jacket 5, the heating near the hot water supply port 4 becomes insufficient compared with the upper part of the crucible, and the smooth drawing out of the molten metal 3 is hindered. In addition, when the heating power is increased to make the vicinity of the hot water supply port 4 an appropriate temperature, the temperature of the upper portion of the crucible excessively increases, which adversely affects the quality of the cast product and shortens the life of the crucible 1, resulting in disadvantageous results in casting. was there. For this reason, as shown in FIG. 2, there is disclosed an apparatus in which cylindrical coils 2 and 2 ′ are provided above and below a die 6 as a boundary to achieve uniform heating and holding in the crucible 1 (particularly, FIG. 2). Kaihei 2-2107
No. 89).

Although such a technique can surely make the temperature uniform, in the case where the die portion is provided relatively below the side wall of the crucible, the cooling jacket hinders the formation of the die. There is a problem that the cylindrical coil cannot be provided in the lower portion, and uniform heating and holding cannot be achieved.

The present invention solves the above-mentioned conventional problems and provides an excellent horizontal die which can uniformly and efficiently hold a raw material melted in a crucible by dielectric heating even when a die portion is provided relatively below a crucible side wall. An object is to provide a high-frequency heating coil for continuous casting.

[0008]

As a result of various studies to solve the above-mentioned conventional problems, the present inventors have found a practically suitable high-frequency heating coil for horizontal continuous casting, and have completed the present invention. That is, the present invention is a high-frequency heating coil of a horizontal crucible for continuous casting having a die on the side wall,
In the upper part of the die, a plurality of turns of a cylindrical coil surrounding the crucible are provided, and in the bottom region of the crucible, a high frequency heating coil for horizontal continuous casting in which a flat-wound coil is arranged substantially horizontally with the bottom of the crucible is provided. The present invention also provides a high-frequency heating coil for horizontal continuous casting in which the cylindrical coil and the flat-wound coil are supplied by the same power supply or a power supply for each coil.

The high-frequency heating coil for horizontal continuous casting of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory sectional view showing an example of the high-frequency heating coil for horizontal continuous casting of the present invention. As shown in this figure, a die 6 is provided below the side wall of the horizontal crucible 1, and a cooling jacket 5 is attached so as to cover the die. The molten metal 3 of the raw material metal in the crucible 1 passes through the hot water supply port 4 below the crucible side wall, passes through the die 6, is cooled and drawn out to be a product 7.

A high-frequency heating coil is provided above and below the die 6 provided on the crucible 1 as a boundary.
The upper portion is provided with a cylindrical coil 2 having a plurality of turns so as to surround the crucible, and the lower portion, ie, the bottom region of the crucible, is provided with a flat coil 1 in a direction substantially horizontal to the bottom surface.
2 are provided. The bottom region refers to a range of a shape conforming to the crucible bottom surface or a slightly wider shape. The flat-wound coil 12 has a left-handed or right-handed spiral shape, and its outer shape is a circular shape, an elliptical shape, a square shape, or the like. Good.

If the coil 12 is used to select a flat-wound coil in accordance with the die, cooling jacket and crucible bottom region, the molten raw metal in the crucible can always be heated and held uniformly.

In particular, according to the present invention, the flat wound coil 12 placed in the crucible bottom region is not of the conventional type surrounding a crucible as shown in FIG. The coil 12 can be provided in the crucible bottom area and held by heating.

As the high-frequency heating coil used in the present invention, various conventional coils are used. In particular, hollow copper pipes can flow a large current with thin windings when cooling water is passed through, so that the coil can be reduced in size. It is more preferable because it allows. By connecting the upper cylindrical coil and the lower flat wound coil by a coupling method using the same copper pipe or the same nut, power can be supplied by one power supply (the same power supply). In addition, two or more power supplies may be supplied, as long as the temperature in the crucible can be kept uniform, and the same power supply (one power supply) or the power supply for each coil (two power supplies) can be used properly. . Further, the lower flat wound coil may use a litz wire coil instead of a copper pipe coil in some cases.

The high-frequency heating coil of the present invention is effective not only for casting in an atmosphere but also in a protection atmosphere including a vacuum. Iron, copper, lead, aluminum, nickel, precious metals and the like and alloys thereof are used as raw materials. Can be used,
Particularly, a good casting result can be always obtained from a copper alloy having a high melting point to a solder alloy having a low melting point.

[0015]

By providing a cylindrical coil at the upper part of the crucible and arranging a flat coil at the bottom of the crucible, the entire crucible can be set to a uniform temperature, and the molten raw material metal in the crucible can be heated and held uniformly. it can. In particular, it is suitable when the dice attached to the side wall of the crucible is relatively lower.

[0016]

【Example】

(Embodiment) Using a high-frequency heating coil device in which a hollow copper cylindrical coil 2 is disposed above a horizontal crucible 1 and a hollow copper flat-wound coil 12 is disposed in the bottom region of the crucible 1 as shown in FIG. When a current of 25 A to 45 A is supplied for 4 hours by PID automatic temperature control from a power source and the continuous casting of the raw material metal (pure copper) dissolved in the horizontal crucible is performed, the temperature of the molten metal is set to the surface of the molten metal in the crucible and the vicinity of the hot water supply port. As a result, the temperature difference could be suppressed to about 20 ° C.

Comparative Example A horizontal crucible 1 as shown in FIG.
The temperature of the molten metal of the raw metal (pure copper) melted in the horizontal crucible was measured using a high-frequency heating coil device provided with a hollow copper cylindrical coil 2 in the upper part of As a result, the temperature difference was about 50 ° C., which was too large.

[0018]

According to the high-frequency heating coil of the present invention, since the raw metal melted in the crucible is uniformly and efficiently held by induction heating, it is smoothly pulled out through the die to obtain a good quality product. In particular, even in the case where the hot water supply port is provided relatively below the crucible side wall, it can be easily incorporated by the flat-wound coil, and the temperature can be made uniform.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of a continuous casting apparatus for metal using a high-frequency heating coil of the present invention.

FIG. 2 is a longitudinal sectional view of an example of a conventional metal continuous casting device using a high-frequency heating coil.

FIG. 3 is a longitudinal sectional view of an example of a conventional metal continuous casting apparatus using a high-frequency heating coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal crucible 2, 2 'cylindrical coil 3 Melt 4 Hot water supply port 5 Cooling jacket 6 Dice 7 Product 12 Flat wound coil.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-309447 (JP, A) JP-A-4-37442 (JP, A) JP-A-2-210789 (JP, A) JP-A-1- 181946 (JP, A) JP-A-2-82489 (JP, A) JP-A-6-114502 (JP, A) JP-A-40-26246 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 11/10 310 B22D 11/04 114 H05B 6/36

Claims (2)

(57) [Claims] 1. A high-frequency heating coil for a continuous casting horizontal crucible having a die on a side wall, wherein a plurality of turns of a cylindrical coil surrounding the crucible are provided above the die, and a bottom region of the crucible is provided. A flat-type coil for horizontal continuous casting, wherein a flat-wound coil is disposed substantially horizontally with the bottom of the crucible. 2. The high-frequency heating coil for horizontal continuous casting according to claim 1, wherein the cylindrical coil and the flat-wound coil are supplied by the same power supply or a power supply for each coil.