JPH0317585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an amorphous alloy sheet manufacturing apparatus having a polishing device for polishing the surface of a cooling roll for forming and rapidly cooling an amorphous alloy sheet.

[Background of the invention]

Amorphous amorphous alloys have recently been in the spotlight due to the boom in new materials. The amorphous aluminium manufacturing equipment currently in practical use produces amorphous aluminium alloy sheets with extremely small widths (approximately 15 mm), and is used in some of the manufactured amorphous aluminium alloy sheets, VTRs and audio products. Due to its properties, amorphous alloy sheets are desired to be mass-produced. In order to mass produce amorphous metal sheets, the amorphous alloy must be continuously melted, cast into a dungeon, and then passed through a cooling roll from the dungeon to be formed and rapidly cooled. At this time, the amorphous alloy must be rapidly cooled at a cooling rate of 100,000 to 1 million degrees per second. For this reason, the following problems have existed in mass producing amorphous alloy sheets.

When a cooling roll begins to cool an amorphous alloy, its surface bulges in the radial direction due to thermal expansion, creating a thermal crown curve (approximately 50μ per 150mm width of the cooling roll). Due to this thermal crown curve, the center portion of the amorphous alloy sheet becomes thinner than the end portions in the width direction. If there is a thickness difference in the width direction of the amorphous amorphous alloy sheet in this way, the thickness difference will accumulate and the precision of the parts will deteriorate when the commercialized amorphous aluminous alloy sheet is laminated and used in electrical equipment. It was hot. This tendency will become even more pronounced in the future when wider amorphous alloy sheets are manufactured.

Furthermore, when an amorphous alloy sheet is cooled at a high speed, depending on the temperature of the molten metal, the roughness of the surface of the cooling roll gradually increases, causing a roughening phenomenon on the surface of the amorphous alloy sheet. As a countermeasure against this rough skin phenomenon, when amorphous alloy sheets are experimentally manufactured, the surface of the cooling roll is manually polished using sandpaper with extremely small abrasive grains until it has a mirror-like luster. Ta. However, such manual polishing poses no problem at the experimental production stage, but when amorphous alloy sheets are continuously mass-produced, a more efficient polishing technique becomes necessary.
This is a problem.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and provides an amorphous amorphous alloy manufacturing apparatus that can improve uniform thickness accuracy in the width direction of an amorphous amorphous alloy sheet and prevent roughness on the surface of the amorphous amorphous alloy sheet. The purpose is to provide.

[Summary of the invention]

The amorphous amorphous alloy sheet manufacturing apparatus of the present invention includes: a nozzle that injects the molten amorphous alloy from a tundish into a cooling roll; a cooling roll that forms and rapidly cools the amorphous alloy sheet; a predetermined press on the surface of the cooling roll; In an amorphous alloy sheet manufacturing apparatus comprising: a polishing device pressed by pressure; and a thermal crown amount measuring device for measuring the amount of thermal crown; , the thermal crown curve of the cooling roll caused by thermal expansion is flattened by increasing a predetermined pressing force of the polishing device, and when the cooling roll is cooled and the measurement signal becomes smaller than a predetermined value, a pressing force control device that returns the pressing force of the polishing device to an initial setting value; a reciprocating device that can adjust the axial position of the cooling roll of the polishing device; a suction device that sucks abrasive grains generated by polishing; An apparatus for manufacturing an amorphous alloy sheet is characterized in that it is provided with;

Generally, the thermal crown curve that occurs on a cooling roll becomes constant after a few seconds after cooling begins, but if the surface of the cooling roll is polished flat with a polishing device after it becomes constant, there will be no difference in thickness in the width direction. Amorphous alloy sheets can be produced. Furthermore, after the thermal crown curve has been removed, the roughening phenomenon that occurs on the surface of the cooling roll can be prevented by lightly operating the polishing device.

The present invention solves the thermal crown curve that occurs on the cooling roll in the amorphous alloy manufacturing equipment.
The main purpose of the polishing device is to remove it, and although it is not limited to polishing devices with a specific structure, it also has the function of preventing roughening, so the polishing device must be cooled. It is necessary to have a grinding wheel that can be pressed with any pressure against the surface of the roll.

Further, the polishing wheel may be one that can simply be pressed against the rotating cooling roll, but it may also be one that can be pressed against the surface of the cooling roll while rotating itself.

Further, in order to enhance the polishing effect of the polishing wheel, the polishing wheel can be reciprocated in the axial direction of the cooling roll.

In general, cooling rolls that form and cool amorphous alloy sheets are made of a softer alloy such as copper metal than normal cooling rolls, and more abrasive grains are produced during polishing. . Therefore, it is necessary to include a suction device so that the abrasive grains do not degrade the functionality of the polishing device.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of the amorphous alloy manufacturing apparatus of this embodiment. The central cooling roll is rotatable to the right. Near the cooling roll 1, there is a drum-shaped winder 4 for winding the amorphous metal sheet 3 produced from the cooling roll 1.
is provided. At the other end of the winder 4 of the cooling roll, a tundish 2 is provided adjacent to the roll. A nozzle (not shown) is connected to this tundish 2. Tandishyu 2
A molten amorphous alloy is stored therein, and this molten alloy is ejected to the cooling roll through a nozzle by gas pressure. A polishing device 5 is provided on the cooling roll 1 and is adapted to press a polishing wheel 6 against the surface of the cooling roll 1. Further, a crown measuring device 7 is provided near the cooling roll 1 for measuring the amount of crown, which is the size of the thermal crown curve. Further, on the right side of the polishing device 5, an abrasive suction device 8 is installed for sucking abrasive grains generated by polishing.

An outline of the operation of this embodiment will be described below. When the amorphous alloy melted in the tundish 2 is cooled by the cooling roll 1, a thermal crown curve is generated in the cooling roll 1 due to thermal expansion (see FIG. 2A). This thermal crown curve becomes a constant value in 3 to 5 seconds when the width of the amorphous alloy sheet is 150 mm. This thermal crown amount is detected using a thermal crown amount measuring device 7, and a grindstone 6 made of fine abrasive grains is pressed against the surface of the cooling roll 1 via a control mechanism described later to remove the thermal crown curve. If the pressing force of the grinding wheel 6 is increased, the time required to remove the thermal crown curve will be reduced depending on the width of the amorphous alloy sheet.
If the diameter is 150mm and the thermal crown amount is 50μ, it will take about 1 to 3 minutes. The thermal crown curve will be explained in more detail using FIG. 2. FIG. 2A shows the surface shape of the cooling roll 3 to 5 seconds after the cooling roll 1 starts cooling. A thermal crown curve occurs, and the thickness of the amorphous alloy sheet 1 becomes thinner at the center, and the thickness is non-uniform in the width direction. When online polishing is performed using the polishing device 5 with this thermal crown curve generated, the thermal crown curve is removed and the surface of the cooling roll 1 becomes flat as shown in FIG. 2B. This is the shape of the cooling roll 1 in a thermally balanced state. In this state, the amorphous alloy sheet 1 has a uniform thickness in the width direction. After that, when the cooling roll 1 returns to normal temperature,
As shown in FIG. 2C, the surface of the cooling roll 1 contracts and becomes depressed.

As a general technique, it is theoretically possible to process the initial crown of the cooling roll 1 at room temperature to form the shape shown in FIG. 2C without polishing the cooling roll 1 online. However, in the cooling roll 1 having complicated grooves for cooling water, at room temperature, it is calculated as shown in Fig. 2C.
It is practically difficult to form the shape as shown.
Therefore, when the thermal crown curve of the cooling roll 1 becomes constant as described above, the thermal crown curve can be removed most accurately and easily by flat polishing on-line. Note that once the thermal crown curve is removed, a flat amorphous metal sheet can be produced without the need for polishing in the subsequent production of an amorphous alloy sheet using the same cooling roll. However, in order to roughen the surface of the cooling roll 1 described above, the polishing device 5 is continuously used.

Each device of this embodiment will be explained below.

Polishing Apparatus The polishing apparatus 5 used in this embodiment will be explained with reference to FIGS. 3 and 6. The polishing wheel 6 is a rotating shaft 6
The rotating shaft 61 is supported by a bearing box 62 and is rotatable.
The bearing box 62 is provided at the tip of a rod-shaped pressing lever 51, and the pressing lever 51 is rotatably supported by a pressing fulcrum 52 at the center. A pressing cylinder 53 is connected to the other end of the pressing lever 51 . Further, a thermal crown amount measuring device 7 is provided near the cooling roll 1. In addition, in order to rotate the cylindrical polishing wheel 6 at low speed, the rotating shaft 61
A motor 63 with a reduction gear is provided. Further, a cylinder 63 for reciprocating the cylindrical polishing wheel 6 provided on the rotating shaft 61 in the axial direction is provided on the rotating shaft. Further, the rotating shaft 61 is provided with a detector 64 that detects the position of the rotating shaft 61 in the axial direction.

Next, the control mechanism of the polishing apparatus will be explained with reference to FIGS. 5 and 6. A servo valve 54 is connected to the pressure cylinder 53 and controls fluid so that an arbitrary pressure difference can be generated in the pressure cylinder 53.
Furthermore, a pressure cell 55 for measuring the pressure difference between the rod side and the head side of the pressure cylinder 3 is connected. Pressure cell 55 and servo valve 5
4 generates a signal and inputs it to a computing unit 56, which controls the servo valve 54. Note that the fluid in the tank 57 is pressurized and sent to the servo valve 54 by a pump device 58 . Further, as shown in FIG. 6, the state of polishing performed by the polishing device 5 is measured by a thermal crown amount measuring device 7 and input to a computing unit 56. The computing unit 56 controls the servo valve 54 based on the given command and the information from the thermal crown amount measuring device 7, and thereby the polishing device 5 is controlled.

In other words, when the measurement signal from the thermal crown amount measuring device 7 is larger than a predetermined setting value set in the calculator 56, it means that a thermal crown curve is occurring.
3 is increased, and the pressing force of the polishing wheel 6 against the cooling roll is increased.

On the other hand, when the measurement signal from the thermal crown amount measuring device 7 is smaller than the set value of the calculator 56,
Since the thermal crown curve has been removed, the pressing force of the pressing cylinder 53 is weakened, and the pressing force of the polishing wheel 6 against the cooling roll is returned to its initial value.

The cooling roll can be polished while checking the surface condition of the cooling roll using a thermal crown measuring device until the thermal crown of the cooling roll is completely removed.

Since the cooling roll 1 rotates at a high rotational speed exceeding 30 m/sec, the pressing force of the polishing wheel 6 is controlled to perform polishing. In order to control this pressing force to a minute value, the pressure difference between the rod side and the head side in the pressing cylinder is measured by the pressure cell 55, and if a pressure different from the set pressure difference occurs,
A command is instantaneously outputted from the computing unit 56 to the servo valve 54, and the pressure is controlled so that it is always maintained at the set pressure.

Thermal Crown Amount Measuring Device The thermal crown amount measuring device 7 emits ultrasonic waves, receives the reflected waves, measures changes in the distance from the ultrasonic transmitter to the cooling roll 1, and determines the amount of crown. However, the thermal crown amount measuring device is not limited to one that uses ultrasonic waves, but two types of devices can be used: one that uses laser light, and one that uses changes in electrical resistance.

Reciprocating Device The rotating shaft 61 on which the cylindrical polishing stone 6 is formed is provided with a reciprocating cylinder 63 for reciprocating the rotating shaft 61 in the axial direction. Further, the rotating shaft 61 is provided with a position measuring device 64 for detecting the axial position of the rotating shaft 61. As shown in FIG. 7, the signal transmitted from the position detector 64 is input to the computer 65, where calculations are performed together with the given command, and a signal is generated to the servo valve 66. The servo valve 66 sends pressure fluid to the rod side or head side of the reciprocating cylinder 63 in response to a given signal, and sends the pressure fluid to the rod side or head side of the reciprocating cylinder 63, and
It reciprocates in the axial direction. Note that the fluid in the servo valve 66 is the fluid in the tank 67 that is pressurized by the pump device 68 and sent to the servo valve.

In order to make the polishing state of the surface of the cooling roll 1 more uniform, it is desirable to make the polishing wheel 6 move slightly back and forth in the axial direction. It will be done.
The displacement amount and reciprocating speed of the reciprocating motion are determined by the position detector 6.
4. It is determined and controlled by a computer 65 and a servo valve 66.

Abrasive suction device The abrasive suction device 8 used in this example is
This will be explained with reference to FIG. Vacuum suction device 81
A box-shaped suction cover 83 is provided at the tip of the suction hose 82 extending from the suction hose 82 . This suction cover 83 has a box-shaped lower surface open and covers the entire width of the surface of the cooling roll 1. This covered position is behind the polishing wheel 6 in the rotational direction of the cooling roll 1. The interior of the suction cover 83 is divided into two chambers in the rotational direction of the cooling roll 1, and a compressed air jet nozzle 84 opens downward in the front chamber. A suction port 85 of a suction hose 82 is open in the rear chamber, and a brush-like felt 86 is installed at the rear end edge.
is provided.

The compressed air jetted from the compressed air jetting nozzle 84 peels off the abrasive grains attached to the surface of the cooling roll 1. The peeled abrasive grains are sucked from the opening 85 of the suction hose 82 in the rear chamber. Further, some of the abrasive grains that remain without being peeled off are forcibly peeled off by the felt 86, and these peeled off abrasive grains are similarly sucked by the suction hose 82.

Abrasive grains have a negative effect on the manufacture of amorphous alloy sheets, and
The fact that the abrasive grains are removed from the surface of the cooling roll 1 by the abrasive suction device 8 before the amorphous amorphous alloy agglomerated on the surface of the cooling roll 1 is supplied to the surface of the cooling roll 1 improves the manufacturing accuracy of the amorphous alloy sheet. It is useful for

[Other Examples]

Referring to FIG. 10, a polishing apparatus according to another embodiment of the amorphous alloy manufacturing apparatus of the present invention will be described below. In this polishing device, a bearing box 62 supporting a rotating shaft 61 provided with a cylindrical polishing stone 6 is supported by upper and lower rubber bags 91 and 92. A certain amount of fluid is stored in the lower rubber bag 92,
The pressure of this constant fluid is always kept constant by the accumulator 93. Upper rubber bag 9
1 is supplied with fluid from a servo valve 94 and adjusted. A pressure cell 95 is provided in the flow path to the upper rubber bag 91.
A signal emitted from the servo valve 94 is inputted to the computer 96 and controls the servo valve 94 together with a command separately given to the computer.

When the cooling roll 1 is not polished by the polishing device, it is necessary to create a gap between the cooling roll 1 and the polishing wheel 6, so the fluid in the upper rubber bag 91 is extracted by the servo valve 94, and the fluid in the lower rubber bag 92 is removed. The polishing wheel 6 is moved upward by the pressure. When the polishing device is operated to polish the surface of the cooling roll 1, fluid is supplied from the servo valve 94 to the upper bag 91, and the fluid pressure is adjusted by the polisher cell 95 to adjust the pressing force while polishing the cooling roll 1. Press the grindstone 6.

According to the embodiments described above, when amorphous amorphous alloy sheets 3 are continuously produced in large quantities, the thermal crown curve on the surface of the cooling roll 1 caused by thermal expansion is removed, and thereby the width direction of the amorphous amorphous alloy sheets 3 is It becomes possible to make the thickness uniform. Further, the roughening phenomenon of the amorphous alloy sheet 3 caused by the roughness occurring on the surface of the cooling roll 1 can be prevented, and the amorphous alloy sheet 3 can be manufactured with constant surface precision and gloss. Then,
As a new material, it has great feasibility and can solve the problems of improving the thickness accuracy in the width direction of the amorphous aluminous alloy sheet 3 and preventing rough skin phenomena, which were problems in the amorphous aluminous alloy sheet manufacturing technology, which is eagerly awaited for mass production. It is.

〔Effect of the invention〕

As explained above, according to the amorphous amorphous alloy sheet manufacturing apparatus according to the present invention, the amount of thermal crown generated on the cooling roll can be measured online, and this can be fed back to the polishing device to quickly remove it. Accuracy can be improved and roughness on the sheet surface can be prevented.

Furthermore, since an abrasive suction device is provided, it helps improve the manufacturing accuracy of the amorphous alloy sheet.

Furthermore, since the axial position of the cooling roll of the polishing device can be adjusted, the polishing state of the cooling roll can be made more uniform.

[Brief explanation of the drawing]

FIG. 1 is a side view of an amorphous alloy manufacturing apparatus according to an embodiment of the present invention, FIGS. 2A, B, and C are cross-sectional views of cooling rolls each representing a thermal crown curve, and FIG. 4 is a plan view of the polishing device shown in FIG. 3, FIGS. 5 and 6 are control circuit diagrams of the polishing device shown in FIG. 4, and FIG.
Fig. 8 is a schematic diagram showing the abrasive suction device shown in Fig. 1, Fig. 9 is a cross-sectional view taken along the line A-A in Fig. FIG. 7 is a schematic side view of a polishing apparatus according to another embodiment of the invention. 1...Cooling roll, 2...Tendishu, 3...
...Amorphous alloy sheet, 4... Winder, 5...
... Polishing device, 6 ... Polishing whetstone, 7 ... Crown measuring device, 8 ... Abrasive suction device, 51 ... Pressing lever, 52 ... Pressing fulcrum, 53 ... Pressing cylinder,
54... Servo valve, 55... Pressure cell, 56... Arithmetic unit, 52... Tank, 58...
Pump device, 61... Rotating shaft, 62... Bearing box,
63...Motor with reducer, 64...Detector, 65
...Computer, 66...Servo valve, 67
... Tank, 68 ... Pump device, 81 ... Vacuum suction device, 82 ... Suction hose, 83 ... Suction cover, 84 ... Compressed air jet nozzle, 85 ... Suction port, 86 ... Felt, 91, 92...Rubber bag,
93... Accumulator, 94... Servo valve, 95... Pressure cell, 96... Computer.

Claims (1)

[Scope of Claims] 1. A nozzle for spouting the molten amorphous alloy from a tundish in which the molten metal is stored onto a cooling roll; a cooling roll for forming and rapidly cooling an amorphous amorphous alloy sheet; and a predetermined pressing force applied to the surface of the cooling roll. An amorphous alloy sheet manufacturing apparatus comprising: a pressed polishing device; a thermal crown amount measuring device for measuring a thermal crown amount; A predetermined pressing force of the polishing device is increased to flatten the thermal crown curve of the cooling roll caused by thermal expansion, and when the cooling roll is cooled and the measurement signal becomes smaller than a predetermined value, the polishing is performed. a pressing force control device that returns the pressing force of the device to an initial setting value; a reciprocating device that can adjust the axial position of the cooling roll of the polishing device; a suction device that sucks abrasive grains generated by polishing; An amorphous alloy sheet manufacturing device characterized by being provided with. 2. The amorphous alloy sheet manufacturing apparatus according to claim 1, wherein the polishing device includes a polishing wheel that can rotate and press against the surface of the cooling roll.