JPH05277673A - Transporting and stripping device for thin metal strip - Google Patents

Abstract

PURPOSE:To surely strip and guide a rapidly solidified thin metal strip from the surface of a cooling roller and to stably transport it to a winder. CONSTITUTION:From the proximity to the side of a pouring nozzle 1, a transporting guide 4 is arranged with a space (d) to the cooling roller 2. A high speed air stream 8 is flowing inside the transporting guide 4, and a doctor blade 5 is provided on the exit side of the transporting guide 4. The doctor blade 5 is pressed at the tip end against the surface of the cooling roller 2 by a cylinder 6, and simultaneously structured to be movable back and forth in the breadthwise direction of the roller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a transport guide in which a high-speed air stream is passed to uniformly wind a quenched metal ribbon produced by rapidly solidifying molten metal on the surface of a cooling body, The present invention relates to a device for peeling and carrying by a doctor blade.

[0002]

2. Description of the Related Art In order to continuously produce a metal ribbon, there is a technique in which a molten metal is rapidly solidified on the surface of a cooling body to directly produce a ribbon. To manufacture a thin strip having a plate thickness of about 20 to 50 μm by the single roll method, generally 10 ⁴ -10 ⁶ ° C / sec.
A moderate cooling rate is required. That is, in the production of a quenched metal strip, unlike the ordinary sheet rolling, it is important to rotate the cooling roll at a constant high speed from the beginning of pouring. Otherwise, the paddle at the tip of the pouring nozzle cannot be stabilized, and it is extremely difficult to manufacture a quenched metal ribbon.

[0003] Generally, a quenched metal ribbon, which is produced at high speed, winds around the outer peripheral surface of a cooling roll, and various technical means have been proposed for separating this from the roll surface.
For example, Japanese Patent Application Laid-Open No. 59-141349 proposes a device in which a ribbon wound around a cooling roll is peeled off by a gas jet stream and closely wound by a coiler having a magnet or the like. However, this technique has a problem that the winding angle differs depending on the ribbon property and material, and the ribbon cannot be guided stably. Furthermore, JP-A-59
No. 43772 proposes an insertion device that sucks and guides a ribbon with an ejector close to a cooling roll. However, this device also has the ejector suction port unless a stable peeling point of the ribbon is ensured for the same reason as described above. There is a problem that the ribbon cannot be guided and it is difficult to stably convey the ribbon.

Further, Japanese Patent Laid-Open No. 61-82953 proposes a method of pressing a metal ribbon against a cooling roll with a metal belt to improve the ribbon shape. In this method, it is difficult to guide the ribbon between the belts, and the ribbon is likely to be jammed inside the belt. Further, there is a problem that the pressing of the belt causes scratches on the surface of the cooling roll, making it impossible to manufacture a ribbon having good properties. To solve this problem, Japanese Utility Model Laid-Open No. 57-43772 proposes a method of carrying a ribbon by a gas injection guide located on the circumference of a cooling roll. This method has a problem in that the ribbon is peeled from the cooling roll immediately after the tip of the ribbon is sucked, and the ribbon is jammed in the guide hood due to the vertical vibration of the ribbon.

Further, Japanese Patent Laid-Open No. 57-39030 proposes a high-speed winding device in which a metal ribbon is separated from a cooling roll by a gas nozzle, immediately thereafter sucked by an air shooter, and induction winding is performed by a high-speed air stream. However, this device requires that the flying speed of the ribbon is to some extent, and that the peeling point is stable. But 1
In the production of an ultrathin ribbon having a thickness of 00 μm or less, the adhesiveness to the cooling roll varies, and the peeling point in the width direction is also unstable, which is considered to be very difficult industrially.

[0006]

Therefore, it is necessary to perform stable ribbon guidance in consideration of the catching of the ribbon tip, the variation of the ribbon peeling point, and the properties of the surface of the cooling roll. The present invention solves the above-mentioned problems of the prior art, and reliably guides the quenched metal ribbon from the surface of the cooling roll,
Further, it is an object of the present invention to provide a metal strip conveying and peeling device that stabilizes the pass line for stable conveyance to the winding machine.

[0007]

The present invention has been made to solve the above-mentioned problems, and a molten metal is supplied from a nozzle to the surface of a cooling roll that rotates at a high speed, and is rapidly solidified on the surface of the cooling roll. It was applied to a transport stripping device for stripping metal strips from the surface of a cooling roll, and the following technical means were adopted. That is, one end is arranged close to the nozzle side face with a predetermined gap with the cooling roll, and a high-speed air stream having a predetermined gas pressure and gas wind velocity is circulated inside to convey the molten metal to the cooling roll surface for guiding. The guide and the cooling roll are provided on the exit side of the conveyance guide to form a predetermined angle, press the tip of the guide against the cooling roll with a predetermined pressing force, and reciprocate at a predetermined speed in the width direction of the cooling roll. A transport stripping device for strips of metal, comprising a doctor blade for stripping the quenched metal strips.

The gap, the gas pressure, the gas wind speed, the angle,
It is preferable that the pressing force and the reciprocating speed are respectively set as follows. Gap 50 to 150 mm Gas wind speed 20 to 50 m / sec Gas pressure 5 to 10 kg / cm ² Angle 10 to 30 ° Pressing force 80 to 150 g / cm Reciprocating speed 1 to 20 mm / sec

[0009]

1 is an explanatory view of an embodiment of the present invention. The molten metal poured from the pouring nozzle 1 directly above the cooling roll 2 is rapidly solidified, and the rapidly cooled thin metal strip 3 is separated from the cooling roll and carried out. That is, the molten metal comes into contact with the cooling roll and is trapped in the conveyance guide 4 in which the high-speed air stream 8 closely arranged is made to flow, and is then separated from the surface of the cooling roll 2 by the doctor blade 5 arranged at the outlet side. In addition, since the tip of the doctor blade 5 is pressed against the surface of the cooling roll 2 by a predetermined pressing force and the surface of the cooling roll 2 is reciprocally moved in the width direction of the roll, ribbon pieces attached to the cooling roll Also has the function of peeling.

The transport guide 4 in which the high-speed air flow 8 is distributed
As shown in FIG. 1, the tip is located directly beside the pouring nozzle 1 and is installed from the surface of the cooling roll 2 via a gap d, which facilitates the guiding of the ribbon. Further, in order to apply the ribbon tension in the transport guide 4, the air flow pressure and speed of the high speed air flow are within the following ranges. (1) Gap between the cooling roll and the transport guide (d) 50
~ 150mm (2) Airflow gas wind speed in the transport guide 20
~ 50m / sec (3) Gas pressure of air flow in the transport guide 5
10 kg / cm ² The effect of preventing congestion of the ribbon in the guide and adding tension to the ribbon is provided. Air, nitrogen, argon gas or the like can be used as the type of gas.

Further, as shown in FIG. 2, the doctor blade is arranged so as to be pressed by the cooling roll according to the following conditions. (4) Angle between cooling roll and doctor blade 10
-30 ° (5) Pressing force of doctor blade 80
~ 150 g / cm (6) Scanning speed in the width direction of the doctor blade 1 ~
20mm / sec The material of doctor blade is carbon, heat resistant resin,
Aluminum alloy, copper alloy, etc. can be used.

Further, depending on the type of the ribbon, the adhesive strength between the ribbon and the cooling roll surface may be large. In such a case, an air knife whose ejection port is directed in the opposite direction to the rotation of the cooling roll is used. If it is arranged behind the doctor blade, the ribbon can be effectively peeled off and conveyed. Next, the reasons for limiting the specifications of high-speed airflow will be described.

In the manufacturing process of paper and film, a high-speed air flow is generally used for the purpose of preventing congestion of web transport and applying tension. However, even though the sheet thickness is thin, the property (wrinkles, cracks) of the ribbon and the stabilization of the peeling point and the flight attitude are important in the transportation of the metal ribbon, so the gap between the cooling roll and the transport guide inlet is 50 mm. ~ 150 mm is suitable, and the high speed airflow at this time has a wind speed of 20 to 50 m / sec and a pressure of 5 to 10 k.
A range of g / cm ² is suitable. When the clearance between the cooling roll and the entrance of the transport guide is 50 mm or less, the airflow velocity is 20 m / sec or less, and the pressure is 5 kg / cm ² or less, ribbon congestion and clogging occur in the guide, and the ribbon can be stably wound and transported around the cooling roll. Can not.

On the other hand, when the gap between the cooling roll and the entrance of the transport guide is 150 mm or more, the airflow velocity is 50 mm / sec or more, and the pressure is 10 kg / cm ² or more, the ribbon flutters greatly, and for example, the ribbon rubs on the surface of the transport guide. , Ribbon bends or breaks.
Therefore, it is not possible to stably carry out the ribbon at high speed. In any case, the ribbon is wound around the cooling roll, and the ribbon cannot be stably peeled off from the cooling roll.
It becomes impossible to guide the ribbon at high speed.

[0015]

EXAMPLE A metal ribbon was manufactured by the apparatus shown in FIG.
That is, 75Fe-20Cr-5Al composition (wt%)
Melts the mother alloy of and uses a pouring nozzle made of silicon nitride,
It was injected onto the surface of a Cu alloy cooling roll having an outer diameter of 800 mm and an internal water cooling mechanism.

The tip is brought close to the side surface of the pouring nozzle 1, the tip of the ribbon 3 is guided to the inlet of the conveyance guide 4 which is arranged with the cooling roll 2 and the gap d, and then the high speed air current 8 is used. The thin strip 3 is passed through the conveyance guide 4. Subsequently, the thin strip 3 is peeled off by the doctor blade 5 which is disposed on the delivery side of the transport guide and whose tip is pressed by the cooling roll and reciprocates in the roll width direction.

Table 1 (Examples) and Table 2 (Comparative Examples) show the results of the experiments in each of the cases where the above conditions (1) to (6) were changed. As shown in Table 1, all the ribbons manufactured within the range of the limiting conditions of the present invention are good, and the ribbons manufactured outside the range of the limiting conditions of the present invention are all defective as shown in Table 2. was there. Reference numeral 7 in FIG. 1 is a motor that operates an air cylinder 6 that presses the doctor blade 5 against the cooling roll 2 with a predetermined pressing force.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

INDUSTRIAL APPLICABILITY According to the present invention, the quenched metal ribbon can be surely peeled off from the surface of the cooling roll and stably conveyed to the winding machine. Therefore, the productivity of the quenched metal ribbon is excellent. Produce an effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is a detailed explanatory view of a peeling device (doctor blade).

[Explanation of symbols]

 1 Pouring Nozzle 2 Cooling Roll 3 Metal Strip 4 Transfer Guide 5 Doctor Blade 6 Air Cylinder 7 Motor 8 High Speed Air Flow d Gap φ Angle

Claims (2)

[Claims] 1. A transport stripping device for strips of metal, wherein molten metal is supplied from a nozzle to the surface of a chill roll that rotates at a high speed, and the quenched metal strip produced by quenching and solidifying on the chill roll surface is stripped from the chill roll surface. A transport guide that has one end close to the side of the nozzle and a predetermined gap with the cooling roll and that allows a high-speed air stream with a predetermined gas pressure and gas wind velocity to flow inside to capture and guide the molten metal to the surface of the cooling roll. And is arranged on the exit side of the conveyance guide to form a predetermined angle with the cooling roll, presses the tip end against the cooling roll with a predetermined pressing force, and reciprocates at a predetermined speed in the width direction of the cooling roll to rapidly cool. A transport stripping device for strips of metal, comprising a doctor blade for stripping strips of metal. 2. The apparatus according to claim 1, wherein the gap, the gas pressure, the gas wind speed, the angle, the pressing force, and the reciprocating movement speed are as follows. Note Gap 50 to 150 mm Gas wind speed 20 to 50 m / sec Gas pressure 5 to 10 kg / cm ² Angle 10 to 30 ° Pressing force 80 to 150 g / cm Reciprocating speed 1 to 20 mm / sec