JPS582737B2 - tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an amorphous metal tape by rapidly cooling molten metal in the form of a tape.

In general, by rapidly cooling molten metal to prevent it from crystallizing, it is possible to impart mechanical and physical properties that are not found in ordinary metals. BACKGROUND OF THE INVENTION Crystalline metals have been produced.

The main methods for manufacturing this tape-shaped amorphous metal are the centrifugal method and the rolling method, and methods that are a compromise between the two methods have also been disclosed.
Both of these two methods have advantages and disadvantages, and even if scaled up as they are, they are unsuitable as industrial production methods.

In the conventional rolling method, the molten metal that is to be made amorphous by quenching is spouted from a nozzle by applying appropriate gas pressure, and then passed through the gap between a pair of rolls rotating at high speed to perform rolling and quenching. However, the problem with this method is that at the beginning of rolling, the rolls are cold and exhibit sufficient cooling capacity, but as time passes, the parts of the rolls that come into contact with the molten metal begin to heat up. , the molten metal is no longer cooled by the rolls.

Moreover, the heated zone of the roll produced by contact with the molten metal is localized at a depth of 1 to 2 mm from the roll surface, and even forced cooling from inside the roll cannot remove the necessary heat.

It is also possible to use copper rolls with high thermal conductivity in place of ordinary alloy steel rolls, but even then a sufficient cooling effect cannot be expected.

Therefore, it is conceivable to make the roll into a thin hollow cylindrical shape and forcibly cool it from inside near the heating zone, but in this case, the rigidity of the roll would be drastically reduced and it would be completely impractical. .

This is because a load of about 51 kg is normally applied to the roll surface during rolling of molten metal, and the roll with the thin hollow structure described above does not have sufficient strength to withstand this load.

As a countermeasure, there is a method of using rolls that are sufficiently long compared to the tape width of the tape-shaped amorphous metal and continuously moving the rolling and cooling parts of the tape with the rolls, but in this case, rolling, The tape that comes out from between the rolls as it cools tends to undergo plastic deformation such as bending and twisting.
Moreover, since the molten metal jet stream and the roll are caused to move relative to each other, the device itself becomes complicated, which is not advantageous.

Also, the normal roll diameter is around 50mm, but for example 10mm.
It is possible to increase the effective pressure extension of the tape by as much as 10 times by using a roll with a large diameter such as a double diameter roll, but in this case, the driving force of the roll should be increased by 100 times. In addition, the manufacturing equipment becomes larger due to the need for a larger supporting part, and the roll surface is easily damaged and worn by the heat of the molten metal and by the scattering of the molten metal, so it is difficult to manage repairs, replacements, etc. From this point of view, the use of large rolls is extremely disadvantageous.

The present invention fundamentally solves the various problems in manufacturing tape-shaped amorphous metal by the rolling method, and involves running a metal belt around the rolling and cooling rolls, respectively, and rolling and cooling. Rolling and cooling are performed by successively bringing the new surface of the metal belt into contact with the jet stream of molten metal to be rolled, which is actually equivalent to extending the surface of the adjacent roll to perform cooling and rolling. As a result, the desired purpose was achieved by allowing the rapid cooling effect to be exerted over a long period of time.

The metal belt used in the present invention is not limited to being endless and wound around a roll, but may be made to run in one direction from the unwinding pongee to the winding shaft and wound around the roll.

In the case of the former endless type, if the belt length can be made sufficiently large, the belt can be cooled naturally outside the rolls, but if the belt length cannot be made large enough, countermeasures such as forced air cooling or water cooling of the belt can be used. It is a good idea to take a course.

Further, the belt width may be smaller than the adjacent roll width and larger than the width of the desired tape-shaped amorphous metal tape.

At that time, in order to prevent the belt surface from displacing in the axial direction of the roll, a recess is formed on the circumference of the roll equal to the belt width and equal to or shallower than the belt thickness, and the belt is hung in this recess, or the belt is hung in the recess. By forming interlocking irregularities on the contact surface between the belt and the roll, or by suppressing displacement of the belt in the axial direction before and after the belt is wound around the roll with a pressing roll, and by controlling the contact position of the belt with the roll. It is extremely advantageous in implementing the present invention to employ a straightening roll or other straightening means that keeps the angle constant.

Further, as long as the material of the belt is not damaged or abraded by molten metal, it is not necessary to select a material with particularly good heat conductivity, and ordinary carbon steel or alloy steel is sufficient.

In addition, installing a belt tension adjustment device to keep the tension of the metal belt constant between rolls regardless of temperature improves the flatness of the obtained tape-shaped amorphous metal and makes the thickness uniform. It is advantageous.

Further, in order to make the present invention more specific, the present invention will be explained with reference to the drawings.

First of all, referring to FIGS. 1 and 2, endless metal belts 4, 4 are wound around two adjacent rolls 2, 3, respectively, and one belt is wound around the roll 2 and guide rolls 5, 6. , the other belt has roll 3 and guide roll 1,
8, and each belt is moved in the direction of the arrow by the rotational drive of these guide rolls or the rotational drive of the adjacent rolls.

Therefore, the jet stream 1 of molten metal is jetted between the adjacent rolls 2 and 3, but since each roll 2 and 3 is covered with a belt 4, the molten metal is passed through the belt 4 to the rolls 2 and 3.
3 to obtain a metal tape 9.

Therefore, the molten metal is directly cooled and rolled by the belt 4, and the adjacent rolls 2 and 3 only serve to press the belt 4, so the rolls 2 and 3 themselves are not heated or worn.

Immediately after the rolling of the molten metal between the adjacent rolls 2 and 3, the belt 4 is heated considerably, but if the belt length is long enough, it will be sufficiently naturally cooled from both sides of the belt while it leaves the rolls and goes around once. It will return to position 3.

It goes without saying that if the belt is forcibly cooled outside the rolls 2 and 3, the belt length can be shortened.

Also, a belt thickness of 0.5 mm is sufficient, but if the thickness is reduced, it will be easier to heat up, but it will also be easier to cool down, so it should be made as thin as possible within the range that provides the necessary cooling ability. It is desirable that the length of the belt be shortened.

The belt's tensile strength only needs to withstand the driving force, so there are no special restrictions in principle on reducing the thickness of the belt, but the circumferential speed of the adjacent rolls is usually 5 to 20 m/sec. Therefore, the length and thickness of the belt should be determined appropriately.

Further, reference numeral 10 denotes a presser roll that prevents the engagement position of the belt 4 between the rolls 2 and 3 from shifting in the roll axis direction.

Further, if the rolls 2 and 3 are structured to have a guide groove 11 around the center in which the belt 4 can be engaged, as shown in FIG. 3, the presser roll can be omitted.

FIG. 4 shows an example in which the belt 4 is run unidirectionally from the feed-out shaft 12 side to the take-up shaft 13 side, and engages with the rolling portions of the adjacent rolls 2 and 3 during its travel.

As described above, according to the present invention, since rolling is performed by belts supported by adjacent rolls from the side opposite to the rolling side, a constantly cooled belt surface can be supplied to the rolling section as a rolling and cooling surface. It is possible to continuously produce quality metal tapes.

Also, since it is only necessary to add a belt drive to the conventional device, the device is simple and relatively compact, which is advantageous in terms of cost.

A further advantage of the present invention is that rolling is not performed directly with adjacent rolls, so there is no need to mirror-finish the surface of the rolls, and therefore there is no wear of the roll surfaces, so there is no need for polishing to make the roll surfaces smooth. It is not necessary at all, and only the belt needs to be replaced, and commercially available rolled material can be used as is, which is extremely advantageous in terms of maintenance and management of the manufacturing equipment.

Embodiment l In the apparatus as shown in FIGS. 1 and 2, the proximity rolls 2, 3
A high-speed steel roll with a diameter of 50 mm and a length of 40 mm was used as a guide for the belt.
A groove with a width of 21 mm and a width of 21 mm was provided around the circumference.

Each roll has a thickness of 0. 2mm, width 20mm, total length 10m
A high-speed steel belt with a mirror finish was applied to the belt, and a tension of several kilograms was applied to it.

A load of 40 kg is applied to the adjacent roll via a belt using the force of a spring.

This allows the belt to rotate freely as the adjacent roll rotates.

So I made a melee roll of 8m/sec (3000r, p.m.
50 Fe-25Co-15S with a molten metal temperature of 1.100°C is placed in the gap between the rolls via a belt.
i-10B (atomic %) alloy 250 gr to 0. 5
When ejected from a mmφ nozzle, an amorphous metal tape with a width of 8 mm, a thickness of 30 μm, and a length of 130 m was obtained.

The belt was cooled naturally. No difference in mechanical properties was observed between the ends of the obtained tape, indicating that cooling was performed well.

On the other hand, when the test was carried out under the same conditions except for the belt, only a width of 14 mm and a length of several meters could be obtained, which shows that the effect of using a belt is superior.

Example 2 When the melted amount of molten metal was doubled in Example 1, it was observed that the belt tended to warm up at the end of rolling, so a cooling device with a set of cold water spray was installed between the adjacent roll and the guide roll. Even better results were obtained when cooling was applied from both sides of the belt.

In this case, there is an advantage that the belt surface is always quenched and hardened.

Example 3 Using the apparatus shown in FIG. 4, a gentle brake was applied to the belt on the feed-out shaft side, and a slip was applied to the belt on the wind-up shaft side, so that the belt could follow the feed of the adjacent roll.

In this example, since the same part of the belt was never used twice during the same rolling process, even better cooling performance than in Examples 1 and 2 was obtained under the same conditions.

Although this embodiment requires a longer belt than those in Examples 1 and 2, it can be made with a thinner belt, so it is relatively light in weight and more compact in terms of space. It has great practical value.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view showing an embodiment of the method of the present invention, FIG. 3 is a modified view of the same proximity roll, and FIG. 4 is a diagram showing another embodiment of the method of the present invention. FIG. 1...Gushing flow of molten metal, 2, 3...Proximity roll, 4...Metal belt, 5-8...
・Guide roll, 9...Amorphous metal tape, 1
0... Presser roll, 11... Guide groove, 12... Payout shaft, 13... Winding shaft.

Claims (1)

[Claims] 1. When producing a tape-shaped amorphous metal by squirting molten metal between two closely rotating high-speed rolls, rolling it, and cooling it, a metal belt is wrapped around each of the two closely rotating rolls. A method for producing a tape-shaped amorphous metal, characterized in that rolling and quenching of the molten metal is applied to the jet flow of the molten metal by the metal belt surfaces between the adjacent rolls.