JPH03275249A - Conveying device in production of rapidly cooled metal strip under inert atmosphere - Google Patents

Abstract

PURPOSE:To enable automatic control to the whole system by setting continuous conveying means having suction device at between separated casting part and discharging part. CONSTITUTION:In the casting part 1, molten metal M in a vessel 7 is caused to continuously flow down on surface of a cooling roll 10 from a nozzle 9 to produce a continuous strip S. In the discharging part 2, a coiler 19, etc., for coiling by drawing the continuous strip S, is set. Then, the casting part 1 and the discharging part 2 are separated. At least, the casting part 1 is made to inert gas atmosphere. Further, the continuous conveying means 12, 18 having the suction device are set at between the casting part 1 and the discharging part 2. By this method, even the production apparatus for rapidly cooled metal strip using inert gas atmosphere under any condition can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application The present invention relates to a method for conveying a thin strip in an apparatus for manufacturing an oxidizable metal thin strip of an iron-based alloy such as stainless steel or an aluminum-based alloy by a roll quenching method. Regarding equipment.

[Conventional technology]

Forming a crystalline metal ribbon with a thickness of 30 to 200 μm by continuously causing molten metal to flow down onto the surface of a moving cooling body is described, for example, in Japanese Patent Publication No. 5821/1983. This was widely known before the filing of this application.

In an apparatus for forming such a metal ribbon, in addition to a casting section in which a molten metal is discharged down onto a moving cooling surface to continuously obtain a ribbon, the continuous ribbon obtained in this casting section is subjected to surface flaws, surface defects, etc.
It is necessary to transport the material to the winder in such a way that wrinkles, bends, meandering, etc. do not occur.

Conventionally, as a conveyance means for this purpose, a method of conveying by pressing a rotating brush or disk onto a moving belt, a method of floating conveyance by blowing gas from below, etc. have been used.

However, attempts have been made to apply the rapid cooling method to crystalline materials such as stainless steel and aluminum alloys, where surface oxidation is undesirable, in the production of metal ribbons, and it has become necessary to make the production atmosphere inert. It's here.

Conventional brush-down methods and gas floating methods as means for conveying the ribbon in such an inert gas atmosphere cannot completely suppress some degree of oscillation of the ribbon.
The chamber structure that enables inert atmosphere casting as described later is not suitable for reliable conveyance and guidance to the extremely limited ribbon outlet.

Furthermore, as an alternative method, it is also possible to adopt a method in which a winder is provided near the cooling roll and the means for conveying the ribbon from the casting section is omitted.

However, in this case, it is conceivable to cover the entire device with a damper, but it is virtually impossible to apply this to a relatively large-scale metal thin strip manufacturing device, and it is necessary to cover the entire device with a damper. This method is also practically impossible to adopt since the winder section must be frequently opened to the outside air and the operation is affected by the restoration of the inert gas atmosphere.

On the other hand, in this quenched metal ribbon manufacturing apparatus that has a casting section and a discharge section including a winder, the casting section and the winding discharge section are spatially separated, and the two parts are kept separated and inert. A method of forming a gas atmosphere has been proposed.

This method of producing quenched metal ribbon can efficiently obtain an inert gas atmosphere, and the removal of the coil from the winder does not have any effect on the operations for forming the ribbon in the casting section. It can be said that it is an extremely practical device because it can be carried out without giving anything.

However, in an apparatus for producing rapidly cooled metal ribbon under such an inert gas atmosphere forming method, the casting section and the winding and discharging section are separated, and a more reliable conveyance method between them is required.

[Problem to be solved by the invention]

The problem to be solved by the present invention is that in an apparatus for manufacturing quenched metal ribbon that forms such an inert gas atmosphere, the ribbon can be transferred from the separate casting section to the discharge section without adversely affecting the inert gas atmosphere. The object of the present invention is to provide a conveying means that can more reliably and stably convey oxidized metal ribbons, and thereby to industrially obtain rapidly oxidized metal ribbons, particularly wide quenched metal ribbons.

[Means to solve the problem]

The present invention has a casting section that produces a continuous ribbon by making the molten metal flow continuously onto the surface of a moving cooling body, and a discharge device that is equipped with a winder, etc. that winds up the continuous ribbon produced in the casting section. In the apparatus for producing quenched metal ribbon, the casting section is separated from the casting section and at least the casting section is in an inert gas atmosphere. It is something.

[Effect]

Since the ribbon can be conveyed from the casting section to the discharge section while being tightly attached to the endless belt, a pass line can be secured even if the casting section and discharge section are separated, and winding at the discharge section can be ensured. It can be carried out.

Since the ribbon is conveyed by suction, the suctioned atmospheric gas can be used as it is by being circulated within the casting section, and the adjustment of the atmospheric gas by suction is not affected at all.

[Example] FIG. 1 is a diagram showing the overall configuration of a rapidly solidified metal ribbon manufacturing apparatus to which a conveying means according to the present invention is applied.

Referring to the figure, the manufacturing equipment is a casting machine consisting of a molten metal holding part, a nozzle provided in the holding part, and a cooling roll that receives the molten metal poured from the nozzle and cools it into a ribbon. It consists of a section 1 and a discharge section 2 having a winder.

The molten metal holding section includes a molten metal transport vehicle 4 moving on a support frame 3 and a container 7 having a heating means 6 such as a high frequency coil for maintaining the temperature of the contained molten metal.
The molten metal M inside is sealed by a lid 8 placed on the top opening, and the surface of the molten metal can be pressurized by supplying gas to the inside.

Furthermore, when manufacturing a large amount of ribbon, a melting furnace is installed and connected to the upper part of the molten metal holding section, and the molten metal can be continuously supplied through the opening 5.

The nozzle 9 disposed below the molten metal holding part has a hole for flowing the molten metal in a shape that allows a certain amount of molten metal to be poured out continuously over time and across the entire width. .

Further, below the nozzle 9, a cooling roll section is arranged which includes a cooling roll 10 rotated by a drive source (not shown), a guide 11, a conveyance means 12 using a suction belt, and the like.

Reference numeral 13 indicates a gap measuring device connected to a control means for measuring the gap between the lower surface of the nozzle 9 and the surface of the cooling roll 10 and keeping the distance between the nozzle and the cooling roll constant.

The casting section 1 is entirely surrounded by a chamber 14, and near the bottom of the chamber 14 there is a suction port 15 connected to a vacuum pump for atmosphere replacement, and an inert gas introduction port connected to an inert gas source. The mouth 16 is open.

Further, 17 is a communication port for conveying the formed metal ribbon S to the discharge section 2, and indicates a gas curtain using an inert gas. Thereby, the continuously formed thin strips S can be continuously introduced into the discharge section 2 without outside air entering the inert gas atmosphere inside the chamber 14.

The discharge section 2 includes a conveying means 18 equipped with a suction device and a winding machine (1) that receives the metal ribbon S produced in the casting section 1 sealed by a chamber 20 and whose oxygen concentration is reduced.
It has 9.

As this winder 19, for example, a winder having the structure described in Japanese Patent Application No. 1-136958 proposed by the present inventors can be suitably used.

Further, in the area of the winding section 2, if the surface temperature of the ribbon S conveyed from the casting section 1 is below the oxidation temperature, no atmosphere adjustment is necessary; Even at the stage of being transported to the machine 19, the temperature may be in a range where oxidation progresses.

In order to prevent this, oxidation can be completely prevented by forming a chamber 20 for simple sealing in the discharge part 2 and introducing a low level of inert gas through the inlet 21.

As the suction device-equipped conveyance means 12.18, a conventional endless belt conveyor using a mesh belt with a suction device can be used. FIG. 2 shows the detailed structure of the conveying means 12 with a suction device, and the conveying means 18 disposed in the discharge section 2 basically has the same structure.

In the figure, a conveyance means 12 is provided close to the discharge end of the cooling roll 10, and a heat-resistant mesh belt 2
2 is suspended between rollers 23 to 27, and driven by a drive motor 28, a drive roller 29 is driven to rotate endlessly. Immediately below the surface of the mesh belt 22 is a third
A suction plate member 31 having suction holes 30 as shown in the figure is arranged. The suction hole 30 of the suction plate member 31 communicates with a suction duct 32 as shown in FIG. 4 when FIG. 3 is viewed from the IV-TV line cross section.
is in communication with the chamber 14 of the casting section 1 shown in FIG. 1, and the sucked atmospheric gas is circulated within the chamber 14.

Then, the conveying mesh belt 22 of the conveying means 12
The motor that controls the rotational speed of the ribbon is automatically adjusted to the same speed as or slightly faster than the circumferential speed of the cooling roll 10, and is further synchronized with the speed of the winder 19 shown in FIG. It has the function of applying a certain tension to the

Therefore, the produced ribbon S from the cooling roll 10 is transferred to the mesh belt 22 which moves in synchronization with the rotational speed of the cooling roll 10.
The receiver is conveyed into the discharge section 2 shown in FIG. 1 in close contact with the receiver, and can be smoothly transferred to the winder 19 from the conveying means 18 having the same function.

〔Effect of the invention〕

The following effects can be achieved by the present invention.

(1) Since the ribbon is conveyed from the casting section to the discharge section by means of conveying the ribbon in close contact with a conveyor belt, there is no restriction on conveyance distance, and rapid cooling is possible in any form of inert gas atmosphere. It can also be applied to a manufacturing device for metal thin strips, making it practically possible to realize such a manufacturing device.

(2) Since the means for conveying the ribbon is a means for conveying it in close contact with the belt, the conveying speed can be reliably controlled by the driving means, and therefore the rotational speed of the cooling roll in the casting section and the winding of the discharge section Mutual synchronization and control with the machine becomes possible, and automatic control of the entire system becomes possible.

(3) As a means of adsorbing the ribbon to the conveyor belt,
Since it uses an inert gas suction/circulation method, it does not adversely affect the inert gas atmosphere used to prevent oxidation during casting.

[Brief explanation of drawings]

The accompanying figures illustrate embodiments of the invention. FIG. 1 shows the overall structure of the apparatus for producing rapidly cooled metal ribbon according to the present invention, and FIGS. 2 to 4 show the detailed structure of the conveying means used in the apparatus. FIG. 3 is a partial cross-sectional plan view, and FIG. 4 is a diagram showing the configuration as seen from the line rv-■ in FIG. 3. 1: Casting section 2; Discharge section 3/support frame 4: Molten metal transport vehicle 5/opening 6: Heating means 7: Container 8: Lid 9: Nozzle 10: Cooling roll conveying means 1 guide 12 3: Gap measuring device 4: Chamber 15: Suction port 6; Inert gas inlet a: Gas curtain 18 9, Winder 20 1: Inert gas inlet 2; Mesh belt 3 to 27 Roller 28/Drive morph 9° drive roller 30: Suction hole 1: Suction member 32; Suction duct molten metal S: Metal ribbon conveying means chamber

Claims (1)

[Claims] 1. A casting section where molten metal is made to flow continuously onto the surface of a moving cooling body to produce a continuous ribbon, and a discharge section equipped with a winder, etc. that pulls out and winds up the continuous ribbon produced in the casting section. an apparatus for producing quenched metal ribbon in which at least the casting section is separated from the casting section and an inert gas atmosphere, wherein a continuous conveying means having a suction device is disposed between the separated casting section and the discharge section. .