JPH0523799A - Method and device for manufacturing metal belt with near terminal end - Google Patents

Abstract

PURPOSE: To control the pouring speed of molten metal so that the metal flow is laminar flow as much as possible and speeds of the molten metal and a cooling belt almost coincide. CONSTITUTION: This method and device are related to continuously production of a metal strip 1 having near the finish size. The molten metal 6 is poured on a cooling belt 2 endlessly circulated, and solidified. In order to obtain the spreading of the molten metal 6 as the layer state in the wide range on the cooling belt 2, the following processes are executed. (A) The molten metal 6 flows from a supplying member 5 and passes through a route 7 connected with this member 5 and having a slender rectangular shaped cross section. (B) The route 7 is inclined to the horizontal line (inclining angle α). (C) The route 7 is connected with the pouring opening part 7 at the upper part of the cooling belt 2. (D) The speed of the poured molten metal 6 decelerated with electromagnetic force worked against the gravitation in the molten metal 6 flowing in the route 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing a metal belt having close end sizes, in which molten metal is poured and solidified on an endless circulating cooling belt.

[0002]

2. Description of the Prior Art In the above-mentioned method, the main problem is that the molten metal is supplied to the circulating cooling belt as uniformly as possible, and this supply should be performed as turbulently as possible. Yes, the molten metal should maintain approximately the same speed as the cooling belt. The method described above (eg DE
-PS 3, 810, 302), the outflow of molten metal is controlled via the gas pressure in the feed, which feed is connected to the low-pressure chamber. A relatively thick wall thickness is required for the feed member. The bottom wall thickness of the feed member essentially determines the metal static pressure, which occurs at the height of the pouring opening in the passage through the feed member wall.
The pressure is greater than that required for metal supply if the outflow is not impeded. With low pressure, the effective metal static pressure magnitude can certainly be reduced below the feed member wall thickness, but in the case of copper alloys containing zinc, the zinc vapor pressure is high, so The low pressure of must be avoided. Therefore, methods that work at low pressure should be excluded from the outset.

[0003]

SUMMARY OF THE INVENTION The basic problem of the present invention is that when low pressure is avoided, the flow of metal is as laminar as possible so that the speed of the melt and that of the cooling belt are almost the same. It is in the place of controlling the outflow rate of.

[0004]

According to the present invention,
The said subject is solved by the following processes. The molten metal flows from the supply member through a path of a substantially rectangular cross section which is connected to this supply member and whose cross-section height is small compared to the width of the cross-section.

The said path is inclined with respect to a horizontal line in the direction of flow of the molten metal (inclination angle α).

The path leads to the pouring opening above the cooling belt.

-The velocity of the molten metal flowing out is controlled by the molten metal flowing in the path being decelerated by the electromotive force against gravity.

This shows how the molten metal velocity can be controlled in a simple manner, without the use of mechanically moving parts.

From DE-PS 3,810,302 mentioned above, indeed, a tilted path is known. The relationship between the slope of the path and the control of the outflow rate is of course not proposed.

The deceleration of molten metal in a narrow, vertically arranged path is known, for example, from EP-OS 0,374,260. However, the path itself ends in a mold, the wide sides of which are each formed by an endless belt extending from top to bottom and the narrow side of the mold which is formed by a movable side limit. Such molds are not suitable for mounting molten metal on cooling belts that are horizontally positioned and moved. The deceleration effect for the molten metal in the path is obtained by two, so-called "linear induction motors", which face each other on the wide side of the mold.
EP-OS 0,374,260 specification page 20, 10
Lines ~ 15 states that indeed complete deceleration of the molten metal is not achieved due to the high metal static pressure. The inventor with respect to said publication has found that the strong deceleration of the speed, which is particularly required for casting of metal belts with close end dimensions, i.e. particularly thin metal belts, results in the following drawbacks due to the vertical arrangement of the electromagnetic choke coil. I didn't realize it wasn't possible because I had to put up with it. That is, the drawback is that if the electromagnetic choke is too weak, the choke can be extended in the positive direction, i.e. vertically downward in the EP-OS arrangement. This certainly offers the possibility of increasing the force of the choke by being able to fit more coils.
However, in this case it is overlooked that the extension of the path in the vertical direction also causes an increase in the metal static pressure, so that increasing the choke several times does not allow complete deceleration.

Due to the inclination of the path according to the invention, the length of the choke can be expanded in the path direction—for a vertical arrangement of the prior art—at otherwise static metal static pressures. It is possible and as a result a complete deceleration is possible.

Preferably, with respect to the inclination angle α of the path, 1
The range of 0 to 50 degrees is selected.

To achieve the complete deceleration effect, according to a special embodiment of the invention, the molten metal is decelerated over the entire length of the path.

Particularly for reasons of space, the electromagnetic field producing the electromagnetic force is preferably produced from a direction located above the path.

In order to preheat the passage, the side wall made of a conductive material is heated mainly by the action of electromagnetic force. Further, the conductive plate material may be introduced into the path and heated by the action of electromagnetic force.

The invention further relates to a device for carrying out the method of the invention. The apparatus comprises a supply member for molten metal, a shallow path of substantially rectangular cross section connected to the member, having a pouring opening, and a cooling belt arranged below said pouring opening. have. The apparatus is characterized in that a linear induction motor is arranged above a path inclined in the flowing direction of the molten metal, and the motor is connected as an electromagnetic brake. A magnetic shunt on the back side, below the path, is convenient for bundling the electromagnetic field. For the preheating of the passages, it is advantageous for the side walls to be made of a conductive material and for the upper and lower walls to be made of a non-conductive material.

[0017]

The present invention will be described in detail with reference to the following examples.

1 and 2 show a casting apparatus for continuously producing a metal belt 1 having a close end size. This casting apparatus is composed of an endless cooling belt 2 which circulates through conveying rollers 3 and 4, a supply member 5 for molten metal 6, and a path 7 (inclination angle α) which is connected to the member and extends obliquely. Consists of A supply container 8 is placed in front of the supply member 5.

The molten metal 6 flows through a path 7 arranged above the cooling belt 2 and is poured onto the cooling belt 2 which circulates in the direction of the arrow, and solidifies there. The path 7 has a rectangular cross section. Its side walls are shown at 9, 10 and its upper and lower walls are shown at 11, 12. The pouring opening 7'of the channel 7 consists of a narrow slit, the length of which is equal to or smaller than the width of the metal belt 1 to be cast (see Fig. 5).

Above the path 7, a linear induction motor 13 (not shown) is arranged over the length of the path. This electric motor is connected as an electromagnetic brake, whereby the molten metal 6 flowing in the path 7 is decelerated by an electromagnetic force that works against gravity. The flow of the molten metal 6 in the path 7 can be controlled so that the speeds of the molten metal 6 and the cooling belt 2 are almost the same.
According to the detailed sectional views of FIGS. 3 and 4, below the path 7,
It is clear that a magnetic shunt 14 on the back side is provided for bundling the electromagnetic field. The shunt cooling device is shown at 15.

The side walls 11 and 12 of the path 7 and the induction motor 1
An insulator 16 is provided between each of them and the magnetic back shunt 14. For preheating of path 7,
It is advantageous if the side walls 9, 10 are made of a conductive material (eg graphite). Upper and lower walls of route 7
1, 12 preferably consist of a non-conducting material (eg silicon carbide SiC). For preheating, a conductive plate material 17 (made of graphite, for example) can also be introduced, which substance is heated by the action of electromagnetic forces.

Example The casting apparatus described above is suitable for continuous production of a brass belt (CuZn30) having dimensions of 5 mm × 400 mm.

For this purpose, the molten brass 6 heated to about 1050 ° C. is first supplied from the supply container 8 to the supply member 5, and then the supply member 5 is formed into a rectangular shape having a cross section of 5 mm. × 380 mm path 7 (tilt angle α = 4
5 degrees) to supply to the conveyor belt 2. The belt 2 is endless and is guided via rollers 3 and 4 having a diameter of 1.2 m. Thickness 1 mm, length 3 between vertices of rollers 3 and 4
A steel belt 2 having a width of 600 mm and a width of 850 mm is used.
The width of the casting belt 1 is given in advance by a boundary member (not shown) which extends together on the sides. The molten metal 6 is indirectly cooled with water on the lower surface of the conveyor belt 2. The delivery speed is 20 m / min. By means of the linear motor 13 arranged above the path 7, it is achieved that the molten metal 6 is placed in a wide laminar flow onto the belt 2. Molten metal 6
Is approximately equal to the speed of the conveyor belt 2.

As a product, the surface quality is perfect,
A brass belt 1 having a fine particle structure with less segregation can be obtained.

[0025]

When the low pressure is avoided, the outflow rate of the molten metal is controlled so that the flow of the metal is as laminar as possible and the speeds of the molten metal and the cooling belt are almost the same.

[Brief description of drawings]

FIG. 1 is a left half portion of a vertical sectional view of a casting apparatus of the present invention.

FIG. 2 is a right half portion of a vertical sectional view of the casting apparatus of the present invention. FIG. 1 and FIG. 2 are united at the location indicated by the one-dot chain line.

FIG. 3 is the left half of the enlarged detail of FIGS. 1 and 2;

FIG. 4 is the right half of the enlarged detail of FIGS. 1 and 2;
FIG. 3 and FIG. 4 are merged at the location indicated by the alternate long and short dash line.

FIG. 5 is a cross-sectional view of a path along which molten metal flows.

[Explanation of symbols]

1 ... Metal belt 2 ... Cooling belt 5: Supply material 6 ... Molten metal 7 ... Route 7 '... opening 9 ... Side wall 10 ... Side wall 11 …… Wall 12 …… Wall 13 ... Electric motor 14 …… Shunt 17 ... Conductive plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Georg Kaze             Germany 7958 Laupheim             A Hoorn Veak 48

Claims (10)

[Claims] 1. A method for continuously producing a metal belt (1) having a close end size, in which a molten metal (6) is poured onto an endless circulating cooling belt (2) and solidified. A method comprising the steps of: A path (7) of molten metal (6) from the supply member (5) of substantially rectangular cross section, which is connected to this supply member (5) and whose height of the cross section is small compared to the width of the cross section. ) Flow through. The path (7) is inclined with respect to a horizontal line in the direction of flow of the molten metal (6) (angle of inclination α). Said path (7) leads above the cooling belt (2) to the pouring opening (7). By the molten metal (6) flowing in the path (7) being slowed down by the electromotive force acting against gravity.
The velocity of the molten metal (6) flowing out is controlled. 2. Method according to claim 1, characterized in that a range between 10 and 50 degrees is selected for the inclination angle α of the path (7). 3. Method according to claim 1 or 2, characterized in that the molten metal (6) is decelerated over the entire length of the path (7). 4. A method according to any one of claims 1 to 3, characterized in that the electromagnetic field producing the electromagnetic force is produced from a direction located above the path (7). 5. The method according to claim 1, wherein the side walls (9, 10) of conductive material are subjected to an electromagnetic force to preheat the passages (7). The method is characterized by being heated by heating. 6. A method according to claim 5, characterized in that a conductive plate (17) is introduced into the path (7) and heated by the action of electromagnetic force. 7. Device for carrying out the method according to claim 1, comprising a supply member (5) for the molten metal (6),
A shallow path (7) of substantially rectangular cross section connected to this member, having a pouring opening (7 '), and a cooling belt (2) arranged below the pouring opening (7'). ), The linear induction motor (13) is arranged above the path (7) inclined in the flowing direction of the molten metal (6), and this motor is connected as an electromagnetic brake. The device characterized in that 8. Device according to claim 7, characterized in that the linear induction motor (13) extends over the length of the path (7). 9. The device according to claim 7, wherein:
A device, characterized in that a magnetic shunt (14) on the back side is arranged below the path (7). 10. The device according to claim 7, wherein the side walls (9, 10) of the passage (7) are made of a conductive material and the upper and lower wall parts (11, 10). 1
A device characterized in that 2) is made of a non-conductive material.