JPH09262648A - Coiling method for metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To coil the thin strip in an excellent condition free from any surface flaws by reducing the tension to be given to the thin metal strip by a conveyor using a suction conveyor in which the surface of a belt is coated with the fluoride resin to prevent the breakage due to the excessive tension in advance. SOLUTION: A belt 11 of a conveyor to be circulated at the position close to a suction box 10 performs suction by a suction blower 12 to suck a thin strip 4 on the belt 11 through a suction plate 9 of the suction blower 12 and the belt 11. By coating the fluoride resin such as Teflon, the friction force to be generated between the thin strip 4 and the belt 11 is reduced, and the tension to be given to the thin strip 4 to be carried by the belt 11 is also reduced. Thus, the breakage due to the excessive tension can be prevented in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a metal ribbon by a quenching process using a cooling roll, particularly when the metal ribbon is peeled off from the cooling roll and then conveyed to a winding reel and wound. It is intended to avoid damage to the belt.

[0002] In recent years, the development of the production of a metal ribbon by a quenching process using a cooling roll has been advanced.
In its industrialization, when a rapidly solidified metal ribbon (hereinafter referred to as a ribbon) is peeled from a cooling roll and then conveyed to a winding reel and wound into a coil on the reel,
If the tension applied to the ribbon is excessive, the ribbon will break, so
It is essential to give proper tension to the ribbon.

[0003]

2. Description of the Related Art As a device for conveying a ribbon to a take-up reel while applying a tension to the ribbon, Japanese Patent Laid-Open No. 6-182508 discloses a belt of a breathable conveyor with two or more pulleys. There is disclosed a suction type conveyor which holds and rotates and sucks air through a conveyor belt from a suction box provided inside the conveyor. By operating the belt of this suction type conveyor at a ribbon speed immediately after peeling from the cooling roll, that is, at a speed higher than the plate-making speed, a tension is applied to the ribbon by the frictional force generated between the belt and the ribbon. It realizes transport while giving.

As the belt of this suction type conveyor, it is common to use a nylon mesh belt used in the paper manufacturing industry or the like, or a stainless mesh belt used for a timing belt, which can withstand high speed rotation. Target.

[0005]

By the way, in the paper manufacturing industry and the like, a nylon mesh belt that controls the conveyance of paper is used in a wet type in which water constantly flows on the belt surface, so that the friction coefficient becomes very small. Therefore, it is possible to carry the paper without excessive tension applied to the paper. However, since the ribbon is conveyed by a dry method and the belt temperature rises to about 100 ° C, nylon belts with low heat resistance
Since the ribbon and the belt are in a state close to welding, the friction coefficient becomes large, and the tension acting on the ribbon tends to be excessive, and as a result, the ribbon often breaks.

On the other hand, the stainless mesh belt has a small coefficient of friction even when used in a dry type and at a belt temperature of about 100 ° C., but has a problem that flaws are likely to occur in the conveyed ribbon. Becomes

The present invention is intended to advantageously solve the above-mentioned problems, and an object thereof is to propose a method for winding a ribbon, which can reduce the tension applied to the ribbon being conveyed. And

[0008]

According to the present invention, molten metal is poured onto the surface of a cooling roll that rotates at a high speed and rapidly solidified to form a metal ribbon, and then gas is blown almost tangentially to the cooling roll. The metal ribbon is peeled from the cooling roll, then the peeled metal ribbon is adsorbed by the suction conveyor arranged near the cooling roll, and the belt of the suction conveyor is operated in this adsorption state to wind the metal ribbon. The tension applied to the metal ribbon by the reel is used to convey the metal ribbon to the reel while winding it on the take-up reel, using a suction conveyor coated with fluororesin on the surface of the belt. Is a method of winding a metal ribbon.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an apparatus for manufacturing a ribbon used in the method of the present invention. In the figure, reference numeral 1 is a cooling roll rotating at a high speed. Molten metal 3 is poured out from a nozzle 2 having a slit-shaped opening on the cooling roll 1, and the molten metal 3 is rapidly solidified on the cooling roll 1. Then, the ribbon 4 is formed.

Next, the thin strip 4 is peeled from the cooling roll 1 by air blowing of an air nozzle 5 having a slit-shaped opening for blowing a gas, for example, compressed air, in a substantially tangential direction of the roll 1, and then the strip 4 is removed. The leading end of the thin strip 4 is sucked onto the starting end of the suction conveyor 6 installed below the peeling point, and the belt of the conveyor is operated while the thin strip 4 is sucked to convey the thin strip 4 to the take-up reel 7 side. The thin strip 4 is wound around the winding reel 7 using a pressing roll or the like, and the thin strip is wound in a state in which the tension required for winding is applied. Reference numeral 8 is a device for guiding and crushing the leading end portion of the low-quality ribbon manufactured until the plate-making reaches a steady state. The ribbon after removal of this leading end portion is taken up by the take-up reel 7 Wrap around.

The suction conveyor is not limited to the one having the above-mentioned structure for sucking air, and the one having a structure for sucking using a magnet is also suitable. Further, the number of suction conveyors installed is not limited to one, and a plurality of suction conveyors can be used.

The present invention is characterized in that the tension applied to the ribbon conveyed by the suction conveyor 6 is reduced in the above-described ribbon winding process. Therefore, in the present invention, as a result of earnestly studying the belt of the suction conveyor 6, as a result, the surface of the belt has high heat resistance,
Moreover, it has been found that the ribbon tension can be reduced by a fluorocarbon resin-coated suction conveyor that is excellent in self-lubricating property even at high temperatures.

Now, as shown in FIG. 2 which shows the suction conveyor 6 according to the present invention, the suction conveyor 6 is, for example, 30%.
The belt 11 of the conveyor 6 which incorporates a suction box 10 whose upper surface is constituted by a suction plate 9 having an opening ratio of about 10% and which circulates and moves near the suction box 10 has an opening ratio of, for example, about 20%. Suction is performed by a suction blower 12 installed outside, and the thin strip 4 on the belt 11 is sucked through the suction plate 9 and the belt 11 of the suction box 10. Normally, the belt 11 of the suction conveyor 6 moves at a speed that is increased by about 5% with respect to the plate-making speed, so that the thin strip 4 is always tensioned by the frictional force with the belt 11. .

In the present invention, when the surface of the belt 11 is coated with a fluororesin such as Teflon, the frictional force generated between the ribbon 4 and the belt 11 is reduced, so that the belt 11 is conveyed to the thin belt. The tension applied to the belt 4 is also reduced.

FIG. 3 shows the relationship between the belt surface temperature and the coefficient of friction of the conventionally used nylon belt and the belt coated with fluororesin according to the present invention. From the figure, it can be seen that the coefficient of friction of the nylon belt increases as the belt surface temperature rises, while the belt coated with fluororesin has a constant value regardless of the belt temperature.

The thickness of the fluororesin coated on the belt is preferably about 20 to 30 μm. This is because if it is too thick, surface cracks and the like are likely to occur, and if it is too thin, durability deteriorates.

The base material of the belt of the suction conveyor is
Although there is no particular limitation, it is recommended to use conventional nylon, as well as aramid fibers such as Kevlar that can withstand high tension.

[0018]

EXAMPLE Using the manufacturing equipment shown in FIG. 1, C: 0.5 at
%, Si: 9 at% and B: 11.5 at%, and the balance of the molten metal which is substantially iron component composition is maintained at a temperature of 1300 ° C. and then rotated at a high peripheral speed of 30 m / s from the nozzle 2. It was poured onto one surface of a cooling roll made of copper alloy, and a thin strip 4 having a plate thickness of 25 μm was prepared. Next, the thin strip 4 is stripped from the cooling roll 1 by blowing air from the air nozzle 5, and the stripping front end of the thin strip 4 is adsorbed to the belt of the suction conveyor 6 arranged immediately below the cooling roll 1, and this adsorption is further performed. In this state, the belt of the conveyor 6 is moved at 31.5 m / s (5% increase with respect to the peripheral speed of the cooling roll), the thin strip 4 is conveyed to the take-up reel 7, and the unsteady part of the leading end of the strip is crushed. After removal with device 8,
After winding the thin strip 4 around the take-up reel 7, the take-up reel 7 took up the film.

Here, the belt 11 of the suction conveyor 6 is
The aramid fiber material is coated with fluororesin to a thickness of 25 μm, and the tension applied to the ribbon during transport is greater than the tension of a suction conveyor using nylon for the conventional belt 11 at the peeling point. Halved.

[0020]

According to the present invention, since the tension of the ribbon during conveyance is reduced, it is possible to prevent the breakage of the over tension in advance, and it is possible to wind the ribbon in a good condition without surface flaws. It was

[Brief description of drawings]

FIG. 1 is a schematic view showing a ribbon manufacturing facility.

FIG. 2 is a diagram showing a structure of a suction conveyor.

FIG. 3 is a diagram showing an influence of a belt surface material on a friction coefficient between a belt and a ribbon.

[Explanation of symbols]

 1 Cooling roll 2 Pouring nozzle 3 Molten metal 4 Thin strip 5 Air nozzle 6 Suction conveyor 7 Take-up reel 8 Crusher 9 Suction plate 10 Suction box 11 Belt 12 Suction blower

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruhiko Ishizuka, No. 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works (72) Toru Sato No. 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Chiba Steel Works, Ltd.

Claims (1)

[Claims] 1. A molten metal is poured onto the surface of a chill roll that rotates at a high speed and rapidly solidified to form a metal ribbon, and then a gas is blown almost tangential to the chill roll to separate the metal ribbon from the chill roll. Then, the peeled metal ribbon is adsorbed by the suction conveyor arranged near the cooling roll, and the belt of the suction conveyor is operated in this adsorption state to convey the metal ribbon to the take-up reel. When the ribbon is wound by a take-up reel while applying tension to the ribbon, a suction conveyor whose surface is coated with a fluororesin is used to reduce the tension applied to the metal ribbon by the conveyor. Method for winding metal ribbon.