JPH04356337A - Meandering control method for extremely thin metallic strip - Google Patents

Abstract

PURPOSE:To prevent the meandering of a quenched metallic thin strip at the time of guiding and carrying the quenched metallic thin strip manufactured by a single roll method, etc., from a cooling single roll to a take-up machine. CONSTITUTION:A thin strip 5 quenched and solidified by a cooling roll 7 and peeled off by air 8 is guided by the suction force of an aspirator 6 to a pinch roll consisting of a solid roll 1 and a brunch roll 2 and caught by the pinch roll, and thereafter, carried to the take-up machine and by providing a gas blowing nozzle 3 immediately before the pinch roll, the meandering of the thin strip 5 is controlled by blowing blowing gas 4 to the surface of the thin strip 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a control method for preventing meandering of a quenched metal ribbon produced by a single roll method or the like when the quenched metal ribbon is guided and conveyed from a single cooling roll to a winding machine. Regarding.

0002

2. Description of the Related Art Metal thin strips are manufactured by injecting molten metal onto the surface of a rotating cooling roll through a slit-shaped nozzle and rapidly solidifying the metal. This quenched metal ribbon is peeled off from the cooling roll with an air knife, captured by pinch rolls loaded on a conveyor, and then conveyed to the winder by moving the conveyor while applying tension to the ribbon with the pinch rolls. Then, it is wound into a coil by a winding machine. Meandering of the ribbon occurs during the process of capturing the ribbon with pinch rolls and moving the carrier.

[0003] In order to prevent meandering of a thin metal plate, many documents have been disclosed regarding methods for detecting and controlling the amount of meandering, and in fact, many techniques have been adopted industrially. For example, Japanese Unexamined Patent Publication No. 2-020608 discloses a method of correcting meandering by detecting the amount of meandering and correcting the amount by leveling or bending the rolling mill in proportion to the detected amount. Furthermore, JP-A No. 2-118031 discloses a method of adjusting the horizontal reduction amount of a tension leveler, and JP-A No. 2-200310 and JP-A No. 61-259815 disclose a method of changing the position of the roll.
Japanese Patent No. 192812 discloses a method using a linear motor. All of these methods forcefully modify a thin metal plate using mechanical force. Apart from this, Japanese Patent Application Laid-Open No. 130957/1983 discloses a non-contact correction method using electromagnetic force.

[0004] All of these meandering control methods are applied to thick metal plates that have high rigidity and are thick so that the plates themselves do not deform. When these methods are applied to a ribbon of 50 μm or less, the ribbon easily breaks due to mechanical force or deforms in the width direction and cracks occur. Further, since the ribbon produced by the single roll method can move at speeds of up to 100 km/h, mechanical pressing force will cause it to break due to friction or the like.

[0005] Therefore, it is very difficult to apply the conventional technology to prevent meandering of metal ribbons of about 50 μm or less, and the stability is significantly impaired, so a completely new meandering prevention technique is required.

[0006]

[Problems to be Solved by the Invention] A metal ribbon of about 50 μm or less produced by a single roll method or the like is much weaker in terms of external strength than a cold-rolled steel plate. Therefore, it has the property of being easily broken by a small shearing force. When such materials are moved at high speed, they will break if restrained by conventional mechanical forces that apply shear forces. Therefore, a method completely different from conventional methods is required to control the meandering of the ribbon.

[0007] Furthermore, when the manufactured ribbon is moved under tension with pinch rolls, if the tension is too strong, it will break, so the tension of the ribbon cannot be made very strong. For this reason, there is a need for a method of applying stable tension with low ribbon tension and little fluctuation. The present invention and the above two
It is an object of the present invention to simultaneously solve these problems and to provide a method for controlling meandering of an ultra-thin metal ribbon.

[0008]

[Means for Solving the Problems] The present invention was proposed in order to solve the above-mentioned problems, and the present invention has been proposed to solve the above-mentioned problems. The quenched metal ribbon is peeled off from a single cooling roll, then introduced into a cylindrical conveyance guide, guided by the suction force of an aspirator to a pinch roll placed at the end of the conveyance guide, and after the pinch roll captures the quenched metal ribbon, the thin metal strip is pinched. This method was applied to the meandering control method when the roll is moved to the winder and the quenched metal ribbon is transported and wound up, and the following meandering control method was adopted. That is, this method of controlling the meandering of an ultra-thin metal ribbon is characterized by correcting the meandering of the ribbon by spraying gas onto the surface of the ribbon at a position immediately before the pinch rolls bite the ribbon.

[0009] After the meandering is corrected, it is more preferable that the ribbon is wound up by a winding machine through guide means disposed on both sides of the ribbon in the width direction to guide the running of the ribbon within a predetermined width. be. Also,
As the gas to be blown onto the ribbon, any inert gas such as air, nitrogen, argon, carbon dioxide, or a mixed gas thereof can be used.

0010

[Operation] The pinch roll must be pulled with a low tension that does not break the ribbon, and if the speeds of the plate-making roll and the pinch roll do not match, the ribbon will break immediately. Although speed differences can basically be synchronized by control, there is no means to prevent the ribbon from breaking when a speed difference occurs. Therefore, the tension of the ribbon must always be maintained at a constant level even when there are speed differences between the rolls.

To achieve this, the pinch roll is composed of a solid roll and a brush roll. That is,
The solid roll has the role of applying tension to pull the ribbon, and the brush roll has the role of relieving excessive tension when it is applied.The effect of these two rolls allows the ribbon to maintain a stable low tension. A pass line can be formed.

After the thin strip is captured by the pinch rolls in this manner, the cart carrying the pinch rolls is conveyed to the winding position while the pinch rolls are in the captured state. However, at the kissing portion of the pinch roll, the ribbon may meander due to slight differences in the rolling reduction amount or the shape of the brush. If this meandering is attempted to be controlled by mechanical force, ribbon breakage will occur.

The inventors of the present invention were inspired by the fact that the ribbon is pulled under low tension, and made it possible to correct the meandering by applying a gas flow to the surface of the ribbon to overcome this tension. That is, when the ribbon meandered in one direction due to the pin roll, the meandering is corrected by spraying from a direction perpendicular to the surface of the ribbon in a direction opposite to the meandering direction.

Next, a method for controlling the meandering of a ribbon by blowing gas will be explained in detail with reference to the drawings. Figure 3(a), (
b) and (c) are cases where the ribbon meandering to the left, and Fig. 3(a) shows a method in which gas is sprayed vertically from above the ribbon to the left side of half the width of the ribbon. Figure 3(b) shows a method of spraying gas from the vertical direction to the right, and Figure 3(c) shows a method of spraying gas from below.
d) is an example of spraying from the back side of the ribbon when the ribbon snakes to the right. All of these steps are performed before the ribbon enters the pinch rolls, so that the ribbons do not come into mechanical contact and breakage of the ribbon can be prevented.

FIG. 1 is an explanatory side view of an embodiment of a meandering control device in which the present invention can be preferably implemented. The thin ribbon 5 that has been rapidly solidified by the cooling roll 7 and peeled off by the air 8 is guided by the suction force of the crushing aspirator 6 to a pinch roll consisting of a solid roll 1 and a brush roll 2, and is captured by the pinch roll. It is conveyed to a winding machine (not shown) while being applied with a low tension and wound into a coil in the winding machine, but a gas blowing nozzle 3 is arranged just before the position where the thin strip 5 is pinched by the pinch rolls. Then, the gas 4 is sprayed onto the ribbon 5 from the nozzle 3. It is more effective to correct meandering if the spraying position is as close as possible to the pinch roll.

In addition to being parallel to the width direction, the gas blowing angle may also be varied in the longitudinal direction of the ribbon without any problem. FIG. 4 shows the action of force at the part where the ribbon and gas are in contact, and component forces act in opposite directions due to the direction of the gas and the reaction force of the ribbon. This force causes the ribbon to move in the opposite direction to the meandering direction, correcting the meandering. For this purpose, it is more desirable to spray the gas on the meandering side rather than the center in the width direction of the ribbon.

[0017] Such a meandering correction method using gas can only be achieved if the ribbon has enough flexibility to deform, the tension is weak enough to deform the ribbon, and the pressure of the pinch rolls is appropriately weak. Ru. Furthermore, when the ribbon is wound onto a take-up reel, it must be cut off from the pinch rolls. At that time, the pass line may change when the thin strip is cut off by winding equipment or a cutting knife, and discontinuous contact in the width direction may occur instantaneously. In order to control such movement, in addition to blowing gas, a side guide for regulating the width of the ribbon is provided immediately before winding, and the stability during winding can be dramatically improved.

[0018] For the purpose of simply correcting meandering, any blowing gas can be used since the pressure is utilized, but from the viewpoint of industrial stability, economy, and safety, it is must be an inert gas. In the present invention, the gas used is an inert gas such as air, nitrogen, argon, or carbon dioxide, or a mixed gas thereof.

[0019]

【Example】

Example 1 Air at 3 kgf/cm2 was blown at an angle of 45 degrees with a width of 30 mm onto the surface of an amorphous metal ribbon having a width of 150 mm and a thickness of 20 μm, in which meandering of about 50 mm was observed at the entrance of the pinch roll. The position of the gas spray nozzle at this time was 30 mm from the pass line surface of the ribbon. As a result, the ribbon was moved 50 mm in the opposite direction to the meandering direction, and the ribbon was corrected to be located in the center of the pinch rolls.

Example 2 Nitrogen gas of 3 kgf/cm2 was applied to the surface of an amorphous metal ribbon with a width of 150 mm and a thickness of 20 μm, in which a meandering of about 50 mm was observed at the entrance of the pinch roll, from the end of the ribbon on the meandering side with a width of 10 mm. It was sprayed vertically at a position 30 mm inside. The position of the gas spray nozzle at this time was 30 mm from the pass line surface of the ribbon. by this,
The ribbon was moved 50 mm in the opposite direction to the meandering direction, and the ribbon was modified to be centered on the pinch rolls.

Embodiment 3 As shown in FIG. 2, the solid roll 1 and the brush roll 2 are sprayed onto the ribbon 5 while correcting the meandering of the gas from the nozzle 3.
If the side guide 10 is used when the thin strip 5 is conveyed to the winding position by a pinch roll consisting of There was no breakage of the ribbon during wrapping. However, when the side guide 10 was not used, the ribbon broke four times out of five windings. From this example, it can be seen that the combination of side guides has an excellent effect.

[0022] Although the same effect can be obtained by blowing the gas on the front or back side of the ribbon, the effect is even more effective if the gas is sprayed on both sides at the same time. Further, the blowing pressure of the gas is not particularly limited, since conditions vary depending on the speed at which the ribbon is made, the thickness of the ribbon, the degree of force between the pinch rolls and the ribbon, and the like. FIG. 5 shows the relationship between the gas blowing direction and the position in the ribbon width direction after meandering correction. In the conventional example, the meandering amount is ±
However, the present invention has been shown to be very effective in correcting meandering in both the spraying direction and the spraying surface.

[0023]

[Effects of the Invention] The present invention can prevent meandering of the ribbon by imparting low tension and stable tension with little fluctuation to the ribbon, so even ultra-thin metal ribbons can be coiled without breaking. It enables winding and has an excellent effect on improving productivity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view of an embodiment of a meandering control device that can suitably implement the present invention.

FIG. 2 is a perspective explanatory view of another embodiment of a meandering control device that can suitably implement the present invention.

FIG. 3 is an explanatory diagram during gas spraying according to the present invention. Figure 3 (
a), (b), and (c) are examples where the ribbon meandered to the left;
FIG. 3(d) shows an example where the ribbon meandered to the right.

FIG. 4 is an explanatory diagram of component force exerted by gas pressure on the ribbon surface during gas spraying.

FIG. 5 is a graph showing the relationship between the direction of gas blowing and the position in the width direction after meandering correction of the ribbon according to the method of the present invention.

[Explanation of symbols]

1 solid roll
2 Brush roll 3 Gas spray nozzle
4 Blowing gas 5 Thin strip
6 Aspirator 7 Cooling roll
8 Peeling air 10 Side guide
11 Take-up reel

Claims (3)

[Claims] Claim 1: A quenched metal ribbon produced by rapid solidification on the peripheral surface of a single cooling roll rotating at high speed is peeled off from the single cooling roll, then introduced into a cylindrical conveyance guide, and placed at the end of the conveyance guide. The suction force of the aspirator guides the arranged pinch rolls, and after the pinch rolls capture the quenched metal ribbon, the pinch rolls are moved to a winder, and the meandering while conveying and winding up the quenched metal ribbon. A meandering control method for an ultra-thin metal ribbon, the control method comprising: correcting the meandering of the ribbon by spraying gas onto the surface of the ribbon at a position immediately before the pinch rolls bite the ribbon. 2. After correcting the meandering of the ribbon, the ribbon is wound up through guide means that are disposed on both sides of the ribbon in the width direction and guide the running of the ribbon within a predetermined width. 2. A method for controlling meandering of an ultra-thin metal ribbon according to claim 1, wherein the ultra-thin metal ribbon is wound by a machine. 3. The method for controlling meandering of an ultra-thin metal ribbon according to claim 1 or 2, wherein the gas is an inert gas such as air, nitrogen, argon, or carbon dioxide, or a mixture thereof.