JP4690994B2 - Amorphous ribbon winding roll switching method - Google Patents

Description

  The present invention relates to a method for winding an amorphous ribbon cast using a cooling roll on-line using a winding device comprising a plurality of winding rolls.

The rapid solidification method for producing an amorphous ribbon includes a single roll method and a twin roll method, and the most common method is a single roll method. This single roll method is a method in which molten metal is jetted onto the surface of a cooling roll rotating at high speed, and rapidly solidified on the cooling roll to obtain an amorphous ribbon continuously. When manufacturing on an industrial scale, it is usually necessary to collect the rapidly solidified amorphous ribbon by winding it. Until now, various methods and apparatuses have been proposed for winding an amorphous ribbon on-line immediately after casting. Generally, a winding roll is used to wind the amorphous ribbon by rotating the winding roll. Methods and apparatus are employed. For example, Patent Document 1 discloses the range of the roll speed of the winding roll when capturing the tip of the amorphous ribbon using a winding roll having a magnetic amorphous ribbon on the surface. A winding method of 90% or more and less than 100% is proposed. However, it is necessary to balance the winding conditions such as casting speed, winding speed, tension, etc., because winding using only one winding roll has restrictions on the winding weight on equipment. Normally, winding is performed using a plurality of winding rolls.
Further, as a winding device using a plurality of winding rolls, there is a carousel type winding device composed of two or more winding rolls having a magnetic surface.

  When winding a cast ribbon continuously with a plurality of winding rolls, it is necessary to switch the winding roll, but it is possible to instantly switch to another winding roll with a winding roll having a magnetic surface. It has been difficult to stably wind up an amorphous ribbon. Therefore, in Patent Document 2, the next winding roll that rotates at a high speed is entered from below into the ribbon pass line that is being wound, and the winding roll is brought into contact with the ribbon to limit the space between the two winding rolls. A method of cutting at a position and winding around the next winding roll has been proposed. In this proposal, the relationship between the distance L1 between the cutting position and the next winding roll and the distance L2 between the next winding roll and the cooling roll is set to L1 ≧ L2 / 20, and the ribbon speed and the winding speed are further set. This is a method of switching the roll speed difference within ± 2 m / sec.

  However, in the method disclosed in Patent Document 2, the tip of the cut amorphous ribbon is captured by the next winding roll, but the amorphous ribbon still breaks immediately after switching, such as the amorphous ribbon is broken. There was a case where the take-up could not be continued, and the take-up roll could not be switched reliably.

JP-A-8-318352 JP 11-28552 A

  The present invention uses a carousel type winding device having a plurality of winding rolls having magnetism on the surface, and is simple and inexpensive when winding an amorphous ribbon, and reliably without breaking the ribbon. Provided is an amorphous ribbon winding roll switching method capable of switching a winding roll.

The present invention has been made in order to solve the above-mentioned problems, and the gist thereof is that two or more winding rolls having magnetism on the surface of a magnetic amorphous ribbon cast using a cooling roll. When the winding roll is switched, the amorphous ribbon is brought into contact with the next winding roll, and the next winding roll is brought close to the cooling roll so that the winding roll and the cooling roll are used. The amorphous ribbon being wound is cut between the winding roll and the next winding roll in a state where the gap with the roll is 1 to 200 mm, and the amorphous ribbon is wound with the next winding roll. This is a method for switching a winding roll of an amorphous ribbon characterized by taking.

  In the winding device comprising two or more winding rolls having magnetism on the surface, when the winding roll is switched, the amorphous ribbon is brought into contact with the next winding roll, and By cutting the amorphous ribbon being wound with the take-up roll in close proximity to the cooling roll, the amorphous ribbon that had occurred immediately after switching was prevented from breaking and switched reliably. Can be possible.

The present invention will be described based on FIGS. 1 (a) to 1 (g) and FIGS. 2 (a) to 2 (f). 1 (a) to 1 (g) show an embodiment of a method for switching a winding roll of an amorphous ribbon according to the present invention when a carousel type winding device having two winding rolls is employed. It is a figure which shows an outline. Figure 2 (a) ~ (f) is a diagram showing an outline of another embodiment of the winding roll switching method of the amorphous thin ribbons of the present invention in the case of adopting a winding device before Symbol Karozeru scheme.

  In FIG. 1 (a), the molten metal 2 in the tundish 1 is sprayed onto the surface of a cooling roll 4 rotating at high speed via a nozzle 3 and rapidly solidified to form an amorphous ribbon 8. The cooling roll 4 Winding is started by a carousel type winding device 5 which is close to the head. The gap between the cooling roll 4 and the winding roll 6 at the start of winding should be as close as possible without causing a collision in order to reliably capture the tip of the amorphous ribbon, and the preferred range is 100 mm or less, More preferably, it is 10 mm or less. This carousel type winding device 5 has a structure in which the winding rolls 6 and 7 are alternately wound at opposite positions, and after winding a certain amount by one winding roll 6, The winding operation is performed by switching the winding to another winding roll 7 facing the other. These winding rolls 6 and 7 embed permanent magnets on the surface of each roll (the magnetic force on the winding roll surface is preferably 1000 G or more), capture the tip of the amorphous ribbon 8 with the force of this magnet, Has a function of winding by rotation of a winding roll. A cutting device 9 connected to a drive mechanism (not shown) provided separately is disposed above the winding device 5.

In FIG. 1A, after the winding device 5 supplements the tip of the amorphous ribbon 8 with the winding roll 6, the winding device 5 comes into contact with the cooling roll 4 due to the thickening of the winding roll 6 and the winding device 5. In order to avoid interference between the take-up roll 6 and the cooling roll 4 during the rotation, it moves in the direction of arrow A, then rotates in the direction of arrow B, and continues to take up constantly in the state of FIG. To do. At this time, the winding roll 6 is in a standby state before the next winding roll 7 facing it comes into contact with the surface of the cooling roll 4 and the surface of the amorphous ribbon 8 in the pass line P formed by the winding roll 6. The amorphous ribbon 8 is wound up. Here, the next winding roll 7 rotates in the moving direction of the pass line P at a surface speed substantially equal to the moving speed of the pass line P (amorphous ribbon 8). When the winding of the winding roll 6 reaches a predetermined amount, the winding roll is rewinded. When rewinding, an arrow is used to bring the amorphous ribbon 8 into contact with the next winding roll 7. The winding device 5 is rotated in the direction D and stopped at the position shown in FIG. At this time, the next stop position of the take-up roll 7 may be that the amorphous ribbon 8 is in contact with the take-up roll 7, but at least 50 mm or more must be brought into contact due to the magnetic force of the take-up roll. Thereafter, the winding device 5 is moved in the direction of arrow E and stopped at a position close to the cooling roll 4 as shown in FIG. At this time, the gap S between the next winding roll 7 and the cooling roll 4 of the winding device 5 should be as close as possible without causing a collision, and may be 1 mm or more and 200 mm or less, but preferably 1 mm or more and 100 mm. It is as follows. At the position where the winding roll 7 is close to the cooling roll 4, the cutting device 9 provided above the winding device 5 moves in the direction of arrow F as shown in FIG. The amorphous ribbon 8 is cut between the taking rolls 7. As shown in FIG. 1 (f), the trapped amorphous ribbon tip portion T swells due to air resistance. However, since the winding roll 7 and the cooling roll 4 are close to each other, the amorphous ribbon tip portion T Is folded when passing through the gap S between the take-up roll 7 and the cooling roll 4, and is wound in close contact with the take-up roll 7, and the amorphous ribbon is broken as shown in FIG. 1 (g). It switches without. Note that the cutting device 9 moves in the direction H immediately after cutting so as not to interfere with the equipment, and waits for information in the winding device 5.
Although the present inventors have stably realized cutting of the amorphous band and capturing of the tip, the inventors have been searching for the reason why the amorphous ribbon has broken and failed to rewind. As a result of analyzing the state at the time of switching, it was found that when the shape of the leading end portion T of the amorphous ribbon swells greatly, the amorphous ribbon is broken when it is caught. Furthermore, it has been found by experiment that if the amorphous ribbon tip T is pressed against the take-up roll 7, breakage can be avoided. Thus, a method has been found in which the winding roll 7 and the cooling roll 4 are brought close to each other so that when the amorphous ribbon tip T passes through the gap S, the tip portion of the ribbon is stably pressed against the winding roll. This method uses the existing cooling roll 4 to press the amorphous ribbon tip T against the take-up roll 7, so that it is not necessary to introduce additional equipment for pressing, and stable rewinding is possible at low cost. It becomes.
The winding roll 6 wound up with the amorphous ribbon is extracted by a winding roll changer (not shown), and a new winding roll is mounted. The winding roll 6 wound up with the amorphous ribbon is transported by a transport device (not shown) and sent to the next step. After the new take-up roll is mounted, the position of the take-up roll 7 is rotated and is taken up constantly at the position of the take-up roll 6 in FIG. A series of these steps are repeated to perform a predetermined number of windings.

In another embodiment of the present invention shown in FIGS. 2 (a) to 2 (f), the winding device 5 in FIG. 2 and then rotates in the direction of arrow B, but stops at the position where the amorphous ribbon 8 contacts the next winding roll 7 as shown in FIG. 2 and stopped at a position close to the cooling roll 4 as shown in FIG. Winding is continuously continued in the state of FIG. When the winding of the winding roll 6 reaches a predetermined amount, the winding roll is replaced. As shown in FIG. 2D, the winding roll 6 is wound by a cutting device 9 provided above the winding apparatus 5. The amorphous ribbon 8 is cut between the take-up roll 6 and the take-up roll 7. As shown in FIG. 2 (e), the amorphous ribbon leading end portion T is folded back when passing through the gap S between the winding roll 7 and the cooling roll 4, and is wound in close contact with the winding roll 7. As shown in 2 (f), the amorphous ribbon switches without breaking.
The winding roll 6 wound up with the amorphous ribbon is extracted by a winding roll changer (not shown), and a new winding roll is mounted. The winding roll 6 wound up with the amorphous ribbon is transported by a transport device (not shown) and sent to the next step. After the new take-up roll is mounted, the take-up device 5 moves and rotates, and continuously takes up the state shown in FIG. 2C through FIG. A series of these steps are repeated to perform a predetermined number of windings.
Although the present invention has been described with reference to FIGS. 1A to 1G and FIGS. 2A to 2F, the winding after winding is shown in FIG. The position of the roll exchange may be performed after the movement of the arrow A in FIG. 1 (a), but after bringing the amorphous ribbon into contact with the winding roll 7 and bringing the winding roll 7 and the cooling roll 4 in proximity, Any method for cutting the amorphous ribbon 8 is regarded as the present invention.

本発明例のＮｏ．１〜１０においては鋳造速度および板厚が変動しても巻取ロールの切り替えは問題なく可能であるが、比較例のＮｏ．１１〜２０では鋳造速度が遅い場合には板厚にかかわらず切り替えは可能であるが、鋳造速度が速くなり、また板厚が厚くなると非晶質薄帯の切断及び先端補足は良好であるが、非晶質薄帯巻き込み時に破断が発生し巻取ロールの切り替えが不可となる。 As an embodiment of the present invention, an amorphous ribbon comprising Fe: 80.5%, B: 15.0%, Si: 3.0%, C 1.0% and the balance of inevitable impurities is cast as atomic percent. The casting roll and the sheet thickness were changed using the apparatus shown in FIG. The nozzle used for casting had an opening shape of 170 mm × 0.85 mm, and was jetted onto the surface of an internal water-cooled cooling roll made of a copper alloy to form an amorphous ribbon. The cooling roll had a diameter of 1198 mm, a width of 250 mm, and a wall thickness of 19 mm.
The winding roll had a diameter of 600 mm, a width of 375 mm, and a magnetic force on the surface of 2000 G. The position of the winding roll at the time of switching was set so that the position of the next winding roll 7 would be the same position as the winding roll 6 at the start of winding from the viewpoint of simplifying the equipment and control. In this case, the contact length between the amorphous ribbon and the winding roll was 30 cm.
As a comparative example, L1 = 30 cm and L2 = 5 m were set by the method disclosed in Patent Document 2, and the other amorphous ribbons were manufactured under the same casting conditions as the present invention example, and the winding and winding rolls were switched. Tried. In both the inventive example and the comparative example, the winding thickness on the winding roll was about 200 mm, and the switching was performed by changing the casting speed and the plate thickness. The results are shown in Table 1.

No. of the example of the present invention. In Nos. 1 to 10, even if the casting speed and the plate thickness vary, the winding roll can be switched without any problem. In the case of 11 to 20, when the casting speed is slow, switching is possible regardless of the plate thickness, but when the casting speed is fast and the plate thickness is thick, the cutting of the amorphous ribbon and the tip supplementation are good. When the amorphous ribbon is wound, a breakage occurs and the winding roll cannot be switched.

(A) is a figure which shows the winding start state of the winding roll switching method of the amorphous ribbon by this invention. (B) is a figure which shows the winding state in a steady state. (C) is a figure which shows the state which the winding apparatus rotated for switching and the amorphous ribbon contacted the winding roll. (D) is a figure which shows the state which the winding apparatus moved and it adjoined to the cooling roll. (E) is a figure which shows the state which cut | disconnected the amorphous ribbon. (F) is a figure which shows the state which winds up the amorphous ribbon strip front-end | tip part. (G) is a figure which shows the state switched to the next winding roll. (A) is a figure which shows the winding start state of the winding roll switching method of the amorphous ribbon by this invention. (B) is a figure which shows the state which the winding apparatus rotated and the amorphous ribbon contacted the winding roll. (C) is a figure which shows the winding state in a steady state. (D) is a figure which shows the state which cut | disconnected the amorphous ribbon. (E) is a figure which shows the state which winds in the amorphous ribbon strip front-end | tip part. (F) is a figure which shows the state switched to the next winding roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tundish 2 Molten metal 3 Nozzle 4 Cooling roll 5 Carousel type winding device 6 Winding roll 7 Winding roll 8 Amorphous ribbon 9 Cutting device A Equipment moving direction B Equipment moving direction D Equipment moving direction E Equipment moving direction F Equipment moving direction H Equipment moving direction P Pass line S Gap between winding roll and cooling roll T Amorphous ribbon tip

Claims (1)

In the method of winding a magnetic amorphous ribbon cast using a cooling roll using two or more winding rolls having magnetism on the surface, the next winding is performed when the winding roll is switched. The amorphous thin ribbon being wound is brought into contact with the roll and the next winding roll is brought close to the cooling roll so that the gap between the winding roll and the cooling roll is 1 to 200 mm. A method for switching a take-up roll of an amorphous thin strip , comprising cutting the strip between a take-up roll and a next take-up roll, and winding up the amorphous thin strip with the next take-up roll.

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