JPS6138740A - Apparatus for producing thin-walled matallic strip - Google Patents

Abstract

PURPOSE:To produce continuously a thin amorphous or ultra-fine crystalline metallic film having a uniform thickness by disposing a cooling drum to one side face of a gate for forming a pouring basin for a molten metal and adjusting adequately the amt. of the molten metal in the gate in the stage of rotating the cooling drum at a high speed and formig the thin metallic film on the surface of the cooling drum. CONSTITUTION:The cooling drum 1 which rotates at a high speed around the horizontal shaft is disposed to one side face of the gate 2 for forming the pouring basin for the molten metal. The molten metal is supplied from the nozzle 10 of a ladle 9 into the gate 2 on the opposite side of the drum 1 partitioned by a partition wall 4. The thin metallic film 8 quickly cooled and solidified by sticking to the drum 1 is adjusted to a uniform thickness by an auxiliary roll 5 and is stripped from the drum 1 by a scraper 6. The stripper film is taken up. The depth (h) of the molten metal which contacts with the drum 1 is detected by a molten metal level gage 12 and is compared with the set value stored in a level controller 13. The opening and closing of the nozzle 10 of the ladle is? adjusted by the comparison value to adjust adequately the depth (h) of the molten metal, by which the thin amorphous or extra-fine crystalline metallic film 8 having no fluctuation in the electrical characteristic value is stably and continuously produced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a thin metal strip manufacturing apparatus for manufacturing an amorphous or ultrafine crystalline thin metal strip by rapidly cooling molten metal. It is related to.

[Prior art and its problems]

BACKGROUND OF THE INVENTION In recent years, amorphous or ultrafine crystalline thin metal strips produced by rapidly cooling molten metal have attracted attention because of their good electromagnetic properties.

As a manufacturing method for such a thin metal strip, molten metal contained in a tundish is injected onto a water-cooled drum rotating at high speed using a nozzle, and the molten metal is rapidly solidified on the drum to form a thin metal strip. A method is known which consists of:

However, according to the above method, the injected molten metal freely spreads and solidifies on the drum, making it difficult to manufacture a thin metal strip with a predetermined width and a uniform thickness in the width direction. It is.

Therefore, in order to solve the above-mentioned problems, there are devices in which the nozzle has a structure that allows a wide molten metal flow to be obtained, for example, in JP-A-53-133531 and JP-A-54-2620.
It is disclosed in Japanese Patent Application Laid-Open No. 5.6-'1.36261, etc.

However, even with the above-mentioned apparatus, it is difficult to inject a molten metal stream of uniform thickness onto the water-cooled drum, and it is inevitable that the thickness of the resulting thin metal strip will be uneven, resulting in , the crystallographic and electrical properties of the thin metal ribbon are 1. There was a problem that varied depending on the location of the metal strip.

[Objective of the Invention] From the above-mentioned viewpoint, the object of the present invention is to provide a thin amorphous or ultrafine crystalline material having a uniform thickness and width and no fluctuation in crystallographic or electrical characteristic values. The purpose of the present invention is to provide a manufacturing device for metal strips.

[Summary of the invention]

The apparatus of the present invention includes a cooling drum having a horizontal axis that rotates at a predetermined speed, and a cooling roll adjacent to the cooling roll for cooperating with a part of the outer peripheral surface of the cooling drum to form a molten metal reservoir. a partition wall provided in a position close to the cooling drum in the molten metal reservoir and parallel to the cooling drum at a predetermined distance from the bottom surface of the molten metal reservoir; an auxiliary roll provided above, close to the cooling drum and parallel to the axis of the cooling drum, and capable of freely pressing against the cooling drum at a predetermined pressure; and a side of the cooling drum opposite to the molten metal reservoir. a scraper provided close to the cooling drum; and a depth detection means for detecting the depth of the molten metal in a portion where the molten metal in the molten metal reservoir contacts the cooling drum; It is characterized by comprising a nozzle opening degree control means for controlling by adjusting the nozzle opening degree of the ladle to be melted in the molten metal reservoir based on the detected value obtained by the depth detection means. It has the following.

[Structure of the invention]

Next, the apparatus of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic plan view showing one embodiment of the apparatus of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG.

As shown in the drawing, a cooling drum 1 is installed with its axis horizontal and capable of multiple rotations by a drive means (not shown). Water or other cooling medium circulates inside the drum 1, so that the temperature distribution on the circumferential surface is always the same. It's cooled down so that it is. Reference numeral 2 denotes a refractory weir for forming a molten metal reservoir 3 in cooperation with a part of the outer peripheral surface of the cooling drum 1. The weir 2 has a side wall 2a sandwiching both side end surfaces of the cooling drum 10 with a slight gap between the two ends.
, 2b, a side wall 2c forming a molten metal reservoir 3 of a predetermined area, which is connected to the other end of the side walls 2a and 2b, and a bottom wall 2d, forming a U-shaped cross section.

The end portion 2c of the bottom wall 2d is formed such that its upper surface is substantially located on the surface along the axis line which is an extension of the horizontal diameter of the cooling drum 1.

Inside the molten metal reservoir 3, at a position close to the cooling drum 1,
A partition wall 4 parallel to the cooling drum 1 is provided across the side walls 2a and 2b at a predetermined distance from the bottom surface of the bottom wall 2d. The partition wall 4 prevents turbulence of the molten metal in the molten metal reservoir 3 and prevents scum from being rolled up by the cooling drum 1 when the molten metal is poured into the molten metal reservoir 3 .

Above the cooling drum 1, in the vicinity of the cooling drum 1, the cooling drum 1 is heated at a predetermined pressure in parallel to the axis of the cooling drum 1.
A small-diameter auxiliary roll 5 that can be pressed is provided. On the opposite side of the cooling drum 1 from the molten metal reservoir 3, a scraper 6 is provided close to the circumferential surface thereof.

As described above, the cooling drum 1 and the weir 2 are defined by the end surfaces of both sides of the cooling drum 10 and the inner surfaces of the side walls 2 a, 2 b of the weir 2, and the surface along the axis of the cooling drum 1 and the end of the weir 2. The portion 2e is adjacent to the portion 2e with a gap sufficient to prevent molten metal from leaking. The dimensions of this gap depend on the physical properties of the molten metal,
Although it varies depending on the number of revolutions of the cooling drum 10 and the depth h of the molten metal in the portion where the molten metal in the molten metal reservoir 3 contacts the cooling drum 1, for example, if the molten metal is an iron alloy, the 0.2 to 0.005 on both end faces
van, 2.0 to 2.0 on the surface along the axis of the cooling drum 1
Approximately 0.005τ is appropriate. If the gap is too small, the surface of the cooling drum 1 will be scraped by the refractory material forming the weir 2, which is not preferable.

While rotating the cooling drum 1 at a predetermined circumferential speed in the direction shown by the arrow, the molten metal in the ladle is poured into the molten metal reservoir 3 on the outside partitioned by the partition plate 4 through the nozzle 7 provided in the ladle. Inject while being careful not to oxidize. The molten metal in the molten metal reservoir 3 adheres to the outer peripheral surface of the cooling drum 1, and as the drum rotates, the molten metal in the molten metal reservoir 3 is deposited at a predetermined thickness.
It is taken out from inside and rapidly cooled by the cooling drum 1 to become a thin metal strip 8. At this time, the length W of the cooling drum 1 in the axial direction becomes the width of the thin metal band.

In this way, the thin metal strip 8 that adheres to the outer circumferential surface of the cooling drum 1 and rapidly solidifies is pressed by the auxiliary roll 5 to have a uniform thickness, and is peeled off from the cooling drum 1 by the scraper 6 (not shown). It is rolled up by a winding machine.

The depth h of the molten metal in the part where the molten metal in the molten metal reservoir 3 contacts the cooling drum 1 has a great influence on the thickness and cooling rate of the product as well as the rotation speed of the cooling drum 1, so it must be adjusted appropriately. need to be controlled.

FIG. 3 is an explanatory diagram showing an embodiment of a mechanism for controlling the depth h of the molten metal in the portion where the molten metal in the molten metal reservoir 3 contacts the cooling drum 1. Molten metal reservoir 3
A ladle 9 for supplying molten metal into the ladle 9 has a nozzle 10 on its bottom wall, the opening of which can be freely adjusted. Molten metal reservoir 3
The depth h of the molten metal at the part where the molten metal contacts the cooling drum 1 is detected by the eddy current level gauge 11 and the level detector 12 as depth detection means, and is input to the level controller 13. Ru.

The detected hot water level value input to the hot water level controller 13 is compared with a set value stored in the hot water level controller 13 in advance. Then, the nozzle opening/closing driver 16 is operated by the nonlinear compensation circuit 14 and the servo amplifier 15 as nozzle opening degree control means so that the level of the molten metal in the molten metal reservoir 3 becomes the set value. Nozzle 10 installed on the wall
The injection speed of molten metal supplied from the ladle 9 into the molten metal reservoir 3 is controlled. 17 is a nozzle opening degree detector. In this way, the depth h of the molten metal in the portion where the molten metal in the molten metal reservoir 3 comes into contact with the cooling drum 1 is controlled to always be a predetermined value. Note that in the case of iron-based alloys, the appropriate value of h is 1 to 50 .

FIG. 4 is a schematic plan view showing another embodiment of the apparatus of the present invention, and FIG. 5 is a sectional view taken along the line B--B in FIG. In this embodiment, the side wall 2a of the weir 2.

The width W' between 2b is smaller than the axial length W of the cooling drum 1, and the cooling drum 1 and the weir 2 are connected to the surface of the cooling drum 10 and the end surfaces of the side walls 2a and 2b of the weir 2. and the end 2e of the bottom wall 2d of the weir 2. The other structures are the same as those shown in FIGS. 1 to 3, and therefore their explanation will be omitted.

〔Effect of the invention〕

Since the present invention is constructed as described above, the molten metal rolled up from the molten metal reservoir by the cooling drum 1 is immediately rapidly solidified to become a thin metal band with uniform thickness and width, and becomes an amorphous metal band. This provides an excellent industrial effect in that a homogeneous thin-walled metal strip with fine or ultra-fine crystallinity can be produced.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing one embodiment of the apparatus of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a portion where the molten metal in the molten metal reservoir contacts the cooling drum. FIG. 4 is a schematic plan view of another embodiment of the device of the present invention, and FIG. 5 is a cross-sectional view taken along line B-B in FIG. 4. It is a diagram. In the drawings: 1... Cooling drum, 2... Weirs 2a, 2b, 2
c... Side wall, 2d... Bottom wall, 2e... End of bottom wall, 3... Molten metal reservoir, 4... Partition wall,
5... Auxiliary roll, 6... Scraper,
7... Nozzle, 8... Thin metal strip, 9...
...Additional pot, 10...Nozzle, 11...Eddy current water level gauge, 12...Mountain level detector, 13...Controller, 14...Nonlinear compensation circuit, 15...Servo amplifier , 16... Nozzle opening/closing driver, 17... Nozzle opening degree detector,

Claims (1)

[Claims] a cooling drum whose axis is horizontal and rotates at a predetermined speed; a weir provided close to the cooling drum for forming a molten metal reservoir in cooperation with a part of the outer peripheral surface of the cooling drum; A partition wall is provided at a position close to the cooling drum in the molten metal reservoir, at a predetermined distance from the bottom surface of the molten metal reservoir, and parallel to the cooling drum; an auxiliary roll provided close to the drum and parallel to the axis of the cooling drum and capable of pressing against the cooling drum at a predetermined pressure; and an auxiliary roll provided close to the cooling drum on the opposite side of the cooling drum from the molten metal reservoir. a scraper provided in the molten metal reservoir, a depth detection means for detecting the depth of the molten metal at a portion where the molten metal in the molten metal reservoir contacts the cooling drum, and a depth detection means by the depth detection means. Based on the obtained detection value, the depth of the molten metal in the portion where the molten metal in the molten metal reservoir contacts the cooling drum is determined by adjusting the nozzle opening of the ladle that supplies molten metal into the molten metal reservoir. 1. An apparatus for manufacturing a thin metal strip, comprising a nozzle opening control means for controlling the opening degree by adjusting the nozzle opening degree.