JPH0342986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amorphous metal manufacturing apparatus, and more particularly to a roll surface cutting apparatus suitable for forming a concave crown on a roll surface and reducing thickness deviation in the width direction of a product.

An amorphous thin plate manufacturing apparatus rapidly cools molten metal by bringing it into contact with the outer surface of a rotating roll. The inside of the roll is cooled all around,
While the roll is in contact with this metal, the temperature rises, and while it is not in contact, the temperature decreases, but if the roll width is wider than the thin plate width and the roll rotates at high speed, the roll surface separates from this metal, Again, because the roll temperature does not return to room temperature before it comes into contact with the molten metal, the roll temperature immediately before the roll surface comes into contact with the molten metal is highest at the center in the width direction and lowest at the ends. For this reason, the amount of thermal expansion of the roll differs in the width direction, resulting in a problem that the thickness of the product plate is thinner at the center and thicker at the ends.

The thickness of the plates manufactured by thin plate manufacturing equipment is 20 to 50 microns, and the thickness deviation in the width direction of the plates that is a problem here is several microns. The inventor confirmed in actual operation that an inverted crown on the roll surface of several tens of microns is sufficient to counteract this, and this amount of inverted crown is
The present invention was devised by noting that attachment can be easily achieved by feeding the cutter diagonally with respect to the roll rotation axis.

An object of the present invention is to provide a thin plate manufacturing apparatus equipped with a roll surface cutting device that can easily form an inverted crown on the roll surface that corresponds to the difference in thermal expansion in the width direction of the roll.

In order to achieve the above object, the present invention includes a crucible equipped with a nozzle for supplying molten metal, a roll rotatably configured to cool the molten metal flowing down from the crucible to produce a thin plate, and a rotatable roll for producing a thin plate by cooling the molten metal flowing down from the crucible. In a thin plate manufacturing apparatus equipped with a roll surface cutting device having a blade for cutting the surface, the roll surface cutting device includes a fixed base disposed at a distance from the roll, and a fixed base fixed to the fixed base; A bracket configured to be swingable in the width direction and radial direction of the roll, a blade mount placed on the bracket and mounted with the blade movably in the direction of the rotation axis center of the roll, and a blade mount that a transfer device that transfers the roll along the width direction thereof, and the blade is brought into contact with the cutter at an angle with respect to an intersection line between a plane including the center of the rotational axis of the roll and a cutting surface of the roll. It is composed of

That is, by fixing the bracket to the fixed base so as to be able to swing, the bracket can be moved in the width direction of the roll that is inclined with respect to the intersection line between the plane including the center of the rotational axis of the roll and the cut surface of the roll. Since the cutter can be fed, an inverted crown corresponding to the difference in the amount of thermal expansion in the width direction of the roll can be easily formed on the roll surface.

FIG. 1 shows a front view of the amorphous thin plate manufacturing apparatus.
The molten metal 2 melted in the crucible 1 is continuously supplied to the surface of the rotating roll 4 through the nozzle 3 at the bottom of the crucible 1, and is solidified and cooled while in contact with the surface of the roll 4. It becomes a thin plate and is wound up on the winding drum 5. The opening 6 at the top of the crucible 1 is connected via a pipe 7 to an internal pressure control device (not shown) of the crucible 1, thereby controlling the amount of molten metal 2 supplied to the roll 4. Also, the winding drum 5
is mounted so as to be movable in the direction of arrow a in order to cope with the increase in the outer circumference of the thin plate during winding.

As shown in FIG. 2, the roll 4 consists of an outer ring 8 made of an alloy mainly composed of copper with good thermal conductivity and an inner ring 9 made of steel inside the outer ring 8 in order to increase cooling capacity. A rotating shaft 10 is attached to the center of the inner ring 9. A slit 11 is provided inside the outer ring 8, and cooling water flows through the slit 11 to cool the outer ring 8.

As shown in Figure 3, when manufacturing a thin plate using this device, the point temperature of the roll 4 rises from the point where the roll 4 starts contacting the molten metal 2 (part A), and the molten metal 2 solidifies. cooling, the temperature decreases, and at the same time,
Since the contact thermal resistance between the thin plate and the roll increases, it begins to descend from a certain point, passes through the point where the thin plate separates from the roll 4 (circle part), and decreases monotonically until it comes into contact with the molten metal 2 again. The temperature at the point of roll 4 changes in almost the same way as the point temperature, but the temperature is 30 to 60 degrees Celsius lower than the point. . This is because at points, heat moves only in the radial direction, whereas at points, heat is transferred also in the width direction of the roll. As a result, as shown by the broken line in Fig. 4, the roll thermally expands in a convex shape and determines the thickness of the thin plate. The point becomes smaller than the point by the difference in thermal expansion due to the temperature difference, and the plate thickness varies in the width direction. This leads to a decline in product quality and yield, and is a problem that must be resolved immediately.

However, when cutting the surface of the roll 4 in the conventional device, the blade is sent in the width direction of the roll parallel to the intersection line between the plane including the center of the rotating shaft 10 and the cutting surface of the roll 4. In order to process a crown on the roll surface with this device, it is necessary to adjust the depth of cut in the radial direction of the blade while feeding it in the width direction of the roll, which requires a high level of skill. In order to improve this, if we try to use a high-performance machine tool equipped with NC manufacturing equipment, etc., the blade drive part of this machine will be large and online cutting will not be possible.
During cutting, the roll must be removed and transported to the machine tool. This method requires a lot of time, such as (1) transportation, (2) mounting on machine tools, centering, (3) assembly into equipment, centering, and (4) waiting for cranes, etc. (5) Since the roll surface is soft and easily scratched, there is an increased possibility that the roll surface will be damaged during transportation.

There is a problem.

In the roll cutting device of the present invention, as shown in FIGS. 5 and 6, the blade 12 is mounted on a blade mount 19 that is movable in the direction of the center of the rotation axis of the roll 4. In other words, the cutter is configured to be able to move forward and backward relative to the roll 4. Then, the blade mount can be transported along substantially the width direction of the roll 4 by the transport device 20.

Further, the blade mount 19 is attached to the bracket 13 so as to be movable in the width direction and radial direction of the roll 4, and the bracket 13 is configured to be rotatable around the pin 14. The pin 14 is fixed to the device by a base 15. To adjust the feed direction of the blade 12, loosen the handle 16, enable the bracket 13 to rotate around the pin 14, push the protrusion 18 attached to the bracket 13 in the required direction with the adjustment screw 17, and once the position is determined, This is done by fixing the bracket 13 with the handle 16.

Next, a description will be given of a crown obtained when the surface of the roll 4 is machined while the cutter 12 is fed at an angle with respect to the rotating shaft 10.

From Figures 7 and 8, y=x×tan〓...(1) ΔR=√ ² + ² -R...(2) For example, the calculation results when R=400mm are graphed as shown in Figure 9. Shown below.

In the actual machine, the gap difference between the nozzle 3 and the nozzle 3 due to the difference in thermal expansion between the central part and the end in the width direction of the roll is as follows: Thin plate material: Iron-based and cobalt-based alloy Plate thickness: 20~30μ Plate width: 100mm Roll circumferential speed: 20~ 30m/s When the roll outer diameter is φ800mm, it is 30 to 50μ, so from Figure 9, if the roll surface is processed with the feed angle α of the cutter being 5 to 7°, the difference in roll thermal expansion can be canceled and the thickness can be reduced. It is possible to produce thin, flat sheets.

According to the present invention, a thin plate manufacturing apparatus is provided that is equipped with a roll surface cutting device that can cancel the crown caused by the difference in thermal expansion between the center and end portions in the width direction of the roll, so that the thickness of the product plate can be made uniform. .

It should be noted that the present invention is not limited to this embodiment, and the same effect can be obtained even if the present invention is applied to a so-called twin-roll manufacturing apparatus that manufactures a thin plate by passing it through a gap between two rolls. .

[Brief explanation of drawings]

Figure 1 is a front view of the amorphous thin plate manufacturing equipment, Figure 2 is a sectional view taken along the - arrow in Figure 1, Figure 3 is a diagram of temperature changes at the center and end of the roll surface in the width direction, and Figure 4. 5 is a cross-sectional view showing the roll thermal expansion of the molten metal injection part, FIG. 5 is a side view of the cutting device of the present invention, and FIG.
The front view, FIG. 7, and FIG. 8 are explanatory diagrams of the symbols used in formulas (1) and (2), and FIG. 9 is a diagram of the crown state when a roll is processed by the cutting device of the present invention. . 4... Roll, 10... Rotating shaft, 12... Cutler, 13... Bracket, 14... Pin, l-l
...The feed direction of the blade.

Claims (1)

[Scope of Claims] 1. A crucible equipped with a nozzle for supplying molten metal, a roll configured to be rotatable for cooling the molten metal flowing down from the crucible to produce a thin plate, and cutting the surface of the roll. In a thin plate manufacturing apparatus equipped with a roll surface cutting device having a blade that cuts a bracket configured to be swingable in both directions and radial directions; a blade mount mounted on the bracket so as to be able to move the blade in the direction of the rotation axis of the roll; a transfer device that transfers the transfer device substantially along the width direction, and the cutter is configured to be brought into contact with the cutter at an angle with respect to an intersection line between a plane including the rotational axis center of the roll and a cutting surface of the roll. A thin plate manufacturing device equipped with a roll surface cutting device characterized by the following.