JPS63160758A - Manufacture of amorphous thin metal strip - Google Patents

Abstract

PURPOSE:To form the amorphous thin strip of good quality with the reverse injection method of a molten metal by holding the angle between the normal line in the progressing direction of a moving cooling body and the injection direction of a molten metal and the gap between the rear part lip and the surface of a moving cooling body in the range of a specific value, installing the rear part lip in parallel to the surface of the moving cooling body. CONSTITUTION:A normal line is drawn in the progressing direction of a mobile cooling body (roll, etc.) 3 on its surface. the angle theta made by said normal line and the injection direction injecting the mobile cooling body in the reverse direction to thin progressing direction is taken to be within the range of 0<theta<60 deg.. The gap (d) between the rear part lip 1' of the injection port part and the surface of the mobile cooling body 3 is taken to be within the range of 0.01mm<=d<0.6mm. The length (a) in the direction opposing to the progressing direction of the rear part lip 1' is made larger than dtantheta. The rear part lip 1' is set up in parallel to the surface of thin mobile cooling body. A molten metal 2 is injected from the injection port part by passing the mid part of front and back lips 1, 1' to form a solidified body (thin strip) 2'. With this method, the amorphous thin trip of good quality can be formed by the reverse injection method of the molten metal.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention jets molten metal from a molten metal spout onto the surface of a moving cooling body (for example, a rotating roll), and rapidly cools the metal on the surface of the cooling body. By letting.

The present invention relates to a method of manufacturing an amorphous metal ribbon.

[Conventional technology]

The technology for producing ultra-quenched ribbons using the single roll method has made significant progress, and has recently been applied to the production of amorphous magnetic alloy ribbons used as materials for fB magnetic heads, high-frequency transformer cores, and the like. A ribbon of such an amorphous magnetic alloy is required not only to have good magnetic properties but also to have a smooth surface of good quality.

In the case of the conventional general amorphous alloy ribbon manufacturing method,
The angle θ (θ is the angle with respect to the normal direction of the surface of the moving cooling body) at which the molten metal is jetted from the spout part of the molten metal supply pipe to the surface of the moving cooling body is a right angle or almost a right angle (%
-46845). Or 70° to 10° with respect to the moving direction of the moving cooling body (Japanese Patent Laid-Open No. 59-183
The molten metal ejected at the ejection angle θ of the method disclosed in Japanese Patent Publication No. 957 forms a puddle on the surface of the cooling body. The hot water tank is immediately cooled at a rate of 104°C/8e0 or more and becomes a thin ribbon.

In particular, a smooth ribbon can be obtained by setting the ejection angle in the same direction as the moving direction of the moving cooling body (for example, a rotating roll), while a smooth ribbon can be obtained by ejecting the molten metal in the opposite direction and forming it on the surface of the moving cooling body. The molten metal may be turbulent and the molten metal may scatter in a direction different from the moving direction of the moving cooling body. Momentum is imparted to the molten metal particles, and a portion of the molten metal particles once again moves toward the spout.

The above-mentioned Japanese Patent Application Laid-Open No. 59/1989 may adhere to the jet nozzle, or become narrowed in the gap between the surface of the moving cooling body and the tip of the jet nozzle, destroying the jet nozzle, or damaging the surface of the moving cooling body. -1
It is stated in Publication No. 83957. On the other hand, Japanese Patent Application Laid-open No. 195564/1983.

In Japanese Unexamined Patent Publication No. 58-16760, a phenomenon completely opposite to the above occurs in the case of manufacturing a microcrystalline ribbon, when 0≦θ≦10°, θ It is stated that it is possible to produce high-quality ribbons by ejecting the molten metal at an angle of <25°.

[Problem that the invention seeks to solve]

The present inventors disclosed Japanese Patent Application Laid-Open No. 195564/1983.

The experiment of manufacturing a ribbon by spouting molten metal in the opposite direction to the moving direction of the moving cooling body described in JP-A-58-16760 was repeated, and the experiment was published in JP-A-59-1839.
As stated in Publication No. 57, when molten metal is jetted out against a moving cooling body that is moving at high speed, it is generally difficult to form a stable pool on the surface of the moving cooling body. This was confirmed experimentally. JP-A-57-1
No. 95564 and Japanese Unexamined Patent Application Publication No. 16760/1982 describe manufacturing conditions other than ejecting the molten metal in the opposite direction (the shape of the spout, the gap between the tip of the spout and the surface of the movable cooling body, the shape of the movable cooling body) There is no mention of movement speed, etc.). However, these conditions make the production of ribbons both possible and impossible.

The present inventors have found that when spouting molten metal in the opposite direction to the moving direction of the moving cooling body, it is extremely important to It has been found that it is difficult to complete an apparatus for producing an amorphous ribbon unless strict conditions are added.That is, one object of the present invention is to determine the above-mentioned manufacturing conditions for producing an amorphous ribbon by the reverse injection method. Under these conditions, the present invention aims to provide a technology for manufacturing an amorphous ribbon in which molten metal is ejected in a direction opposite to the moving direction of a moving cooling body.

[Means for solving problems]

According to the present invention, there is provided a method for producing an amorphous metal ribbon by spouting a molten metal from a spout part of a molten metal supply pipe to a moving cooling body, and rapidly cooling and solidifying the molten metal, comprising:
In the method for manufacturing an amorphous metal ribbon, the molten metal is jetted onto the surface of the moving cooling body in a direction opposite to the traveling direction of the moving cooling body.

A normal line is set on the surface of the movable cooling body perpendicular to the traveling direction of the movable cooling body, and a spouting direction of the molten metal to be spouted and retreated to the movable cooling body in a direction opposite to the traveling direction of the movable cooling body; The angle θ with the normal line is within the range of 0<θ to 60°, and the gap between the rear lip of the tip of the jet nozzle at the rear side with respect to the traveling direction and the surface of the movable cooling body is d. Then, the relationship that the length a of the rear lip in the direction opposite to the traveling direction is at least larger than dtanθ is satisfied, and d is within the range of 0.01■≦d (0.6 mm). Furthermore, there is obtained a method for manufacturing an amorphous metal ribbon, characterized in that the rear lip is disposed substantially parallel to the surface of the moving cooling body.

The following rest days 〔Example〕 Next, embodiments of the present invention will be described with reference to the drawings.

In the case of the conventional manufacturing method (forward jet method) shown in Fig. 2, that is, when the jetting direction of the molten metal 2 is always the same as the moving direction of the moving cooling body 3, the flow velocity of the jetting molten metal increases as it approaches the moving cooling body. 2 It will be accelerated gradually. Therefore, the molten water formed on the surface of the cooling body is not stabilized and solidifies while undergoing complicated changes in flow velocity.

It is conveyed at the moving speed of the moving cooling body. When the flow rate is accelerated, atmospheric gas or air that adheres to the surface of the moving cooling body is drawn in, and when it expands and scatters, it causes unevenness on the surface of the ribbon.

On the other hand, in the case of the reverse injection method according to the present invention shown in FIG. 1, the molten metal 2 is ejected in the opposite direction to the moving cooling body 3, so it approaches the surface of the moving cooling body. The flow velocity is gradually reduced due to the load resistance of the moving cooling body, which is different from the case of the above-mentioned sequential jetting method, and the flow velocity reaches zero near the position where the pool is formed. It will have a velocity vector in the same direction as . Eventually, the sump 2' solidifies on the surface of the moving cooling body and starts moving at a speed equal to the moving speed of the moving cooling body.

In the above case, it is necessary to prepare conditions for stably stopping the hot water tank and transporting it in the reverse direction against the load resistance for the hot water to be jetted out in the opposite direction.

JP-A-59-183957, JP-A-57-19556
The failure of the reverse jetting method described in Publication No. 4 and Japanese Patent Application Laid-Open No. 58-16764 was due to errors in other setting conditions, not just the molten metal jetting angle θ. it is conceivable that.

The present inventors first made the rear lip ff at the tip of the jet nozzle part, which is closer to the rear with respect to the traveling direction of the moving cooling body 3, longer than the front lip f1, which is closer to the front, and the gaps d and e with the respective moving cooling bodies. We tried to establish the relationship d≦e between the two and to make d as small as possible.

In Fig. 3, the jet angle θ = 30°, the cooling body moving speed v =
3Qm/we, jet shape b Xt=0.2 X 30
+ItIR (t is length), injection pressure Pg = 1.0 k
l? /Cm'' manufacturing conditions and d was varied from 0.02 to 0.6 mm 1 of the ribbon manufacturing evaluation results
Show part.

There was no obvious correlation between the relative movement speed between the moving cooling body and the spout and the spout angle of the molten metal.

When the ejection angle becomes large, the success rate of ribbon production becomes higher if the moving speed is lowered.

The ribbon produced by the reverse jetting method of the present invention is superior to the ribbon produced by the conventional forward jetting method.

You can get a thinner one. Therefore, depending on the conditions, the ribbon may have a network of holes. This is because the amount of molten metal ejected per unit time is insufficient, and can be controlled by lowering the relative movement speed.

In Fig. 4, the ejection angle θ = 30° and the cooling body moving speed v =
30 m/sec + ejection pressure P, = 1.0 kl
1 of the results of manufacturing evaluation of thin ribbon when changing b in the spout shape (groove @ b x slit length t) at i/cm2
Show part.

However, the slit length t is 30 mm.

It is desirable that the pool formed on the surface of the moving cooling body be uniform both in quantity and temperature. In order to make the temperature distribution of the hot water pool uniform, it is generally desirable to make the width of the spout groove as narrow as possible. However, if the spout groove gb becomes smaller, the jet pressure P2 must be increased, and the molten metal supply pipe,
Problems arise in the mechanical strength of the jet nozzle, control of the jet flow velocity under high pressure, etc., and there is a natural limit to the narrowing of the jet nozzle groove width. According to the experimental results, b=0.1~0
．． It was possible to manufacture a ribbon with a thickness of 6 mm. Especially b=
Stable ribbon production was possible at 0.1 to 0.3H. In this case, when b > 0.6 m, the ejection pressure P is such that the molten metal easily ejects from the ejection port and creates a stable ribbon.
8 becomes difficult to control. Even if the groove width is 0.01≦b<0.1 and 0.6 pb≦1 (hu), the ejection pressure P in the molten metal supply pipe remains constant. This is an area that can be fully realized by improving the sophistication of the control mechanism.

In FIG. 5, the molten metal jetting angle θ=5. I.Q.

15.20.The optimal manufacturing conditions at 30, 40, 50, 60, and 70 degrees and the evaluation of the product ribbon are summarized.

As is clear from this figure, as θ increases, the thickness of the ribbon gradually decreases, and the parallelism δ of its cross section also decreases rapidly.

The above results are evaluations of ribbon production under optimal conditions, but if the conditions are not appropriate, molten metal may scatter.

As θ becomes larger, it becomes difficult to control the molten metal jetting pressure P2 and the moving speed υ of the moving cooling body, and it is difficult to obtain a uniform ribbon especially when the molten metal jetting angle exceeds 60°.

As shown in Figure 5 above, the ribbon manufactured by the molten metal jetting pressure under sufficient control of the manufacturing conditions is different from the ribbon manufactured by the forward jetting method (currently, most manufacturing uses this method). Even when produced in the atmosphere, there was little gas entrainment and entrainment, and the product was smooth.

Next, specific examples of the present invention will be explained.

As shown in Fig. 1, from the molten metal spout part having the bath water spouting angle θ in the opposite direction to the rotating direction of the moving cooling body (Cu-based alloy rotary cooling roll), the molten metal spout tip face and the above-mentioned cooling roll surface are connected. Gap d=e=o, 10trm*chilling roll circumferential speed υ=
28.30. and 35m/crown, slot groove b =
0.2 rrvn y slit width 30, jet pressure 1,
t (copeNt)7 under the condition of 2 kg/cm2
The molten metal of 3Mo, 5(stn)2z alloy was jetted onto the surface of the cooling roll, and the plate width was 30 and the plate thickness was 0.02 to 0.0158.
A thin ribbon was made. The crystal structure of this ribbon was examined by X-ray diffraction, and it was confirmed that it was amorphous from an X-ray perspective.

The relationship between the position X of the molten metal supply pipe and the molten metal jetting angles θ=θ, +θ2 is shown in FIGS. 6 and 7.

Figure 8 shows the relationship between the molten metal ejection angle θ and the parallelism δ of the ribbon thickness for the ribbons prototyped under the above conditions. In all cases, the ribbons were stably manufactured. As is clear from the figure, as the ejection angle θ increases, the amount of change in parallelism δ of the cross section of the ribbon decreases significantly.

〔Effect of the invention〕

As explained above, according to the two aspects of the present invention, it is possible to produce a good amorphous ribbon by jetting the molten metal onto the surface of the moving cooling body using the reverse jetting method.

From now on

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the method for manufacturing an amorphous ribbon using the reverse jet method according to the present invention, and FIG. 2 is a diagram for explaining the conventional method for manufacturing a ribbon using the conventional forward jet method. , Figure 3 is a diagram showing the evaluation of ribbon production based on changes in the gap d between the jet nozzle tip (rear lip) surface and the surface of the moving cooling body.
The figure shows the ribbon manufacturing evaluation based on the change in b in the spout shape (groove width b x length t). Figure 5 shows the best manufacturing conditions for each molten metal spouting angle of 0 and the product ribbon evaluation. FIG. 6 and FIG. 7 are diagrams for explaining the present invention in detail, and FIG. 8 is a diagram showing the relationship between the molten metal ejection angle θ and the parallelism δ of the ribbon thickness. . 1... Front lip of the spout part, l... Rear lip of the spout part, 2... Spouted molten metal, 2'... Solidified body (thin ribbon)
, 3... Moving cooling body Figure 2 Figure 3 Evaluation criteria: ■ C1 # distillate 100% that can produce a thin ribbon with very high fluorescence)Q A thin ribbon can be produced satisfactorily (9'119
0% polishing) Δ May fail (yield 90-60%)
F
i5dlF) 'Evaluation of ribbon production by conversion to f Figure 4 Evaluation of ribbon production is based on the evaluation criteria d in Figure 3. Manufacturing conditions are also 31. It is similar to that of the third cause. However, the thickness of the manufactured ribbon shall be 26/wax or less. Figure 6. Evaluation of ribbon production based on changes in b in the spout shape (groove width b x length Z-SO dragon) Figure 6 Position of molten metal supply pipe and hot water treatment spout angle HB-6 = 0, 4-
02 and ') Relationship Figure 7 X (cm) θ (degree)

Claims (4)

[Claims] (1) A method for producing an amorphous metal ribbon by spouting molten metal from a spout part of a molten metal supply pipe onto a moving cooling body, and rapidly cooling and solidifying the molten metal, the method comprising: In the method for manufacturing an amorphous metal ribbon, in which the molten metal is ejected onto the surface of the moving cooling body in a direction opposite to the traveling direction, the molten metal is jetted onto the surface of the moving cooling body at right angles to the traveling direction of the moving cooling body. A normal line is erected, and the angle θ between the normal line and the spouting direction of the molten metal jetted to the movable cooling body in a direction opposite to the traveling direction of the movable cooling body is within the range of 0<θ≦60°, When the gap between the rear lip of the tip of the spout portion that is located toward the rear with respect to the traveling direction and the surface of the movable cooling body is d, the length a of the rear lip in the direction opposite to the traveling direction is The relationship that dtanθ is greater than at least is satisfied, d is within the range of 0.01 mm≦d<0.6 mm, and the rear lip is installed so as to be substantially parallel to the surface of the moving cooling body. A method for producing an amorphous metal ribbon, characterized in that: (2) The gap between the front lip of the tip of the jet nozzle part which is forward in the direction of travel and the surface of the movable cooling body is d, and the tip of the jet nozzle part is located backward with respect to the travel direction. Claim 1, wherein the molten metal is ejected onto the surface of the movable cooling body with the relationship d≦e, where e is the gap between the rear lip of the movable cooling body and the surface of the movable cooling body. A method for producing an amorphous metal ribbon. (3) The method for manufacturing an amorphous metal ribbon according to claim 1, wherein the relative movement speed between the moving cooling body and the molten metal supply pipe is 10 to 60 m/sec. (4) The spout groove width b of the molten metal supply pipe is 0.01 mm or more.
A method for producing an amorphous metal ribbon according to claim 1, which has a thickness of 0.6 mm.