JP7059886B2 - How to heat metal leaf - Google Patents

Description

The present invention relates to a heating method for metal heating, in which a band-shaped metal foil is conveyed by a plurality of rolls and heated.

Conventionally, a band-shaped metal foil may be heated while being conveyed by a roll-to-roll mechanism. As a heating method of this kind, for example, in Patent Document 1, in a roll-to-roll mechanism, a strip-shaped metal foil is conveyed between a pair of rolls, and the metal foil is energized between the pair of rolls to energize the metal. A heating method for resistance heating a foil is disclosed. In this heating method, the slack detection sensor detects the amount of slack between the rolls, and the tension applied to the metal foil is adjusted based on the amount of slack.

Japanese Unexamined Patent Publication No. 2016-183421

However, the amount of slack in the metal foil is not always the same at both ends in the width direction of the metal foil, and if only one side is slackened in the width direction of the metal foil, only the slack on one side is corrected. It's difficult to do.

The present invention has been made in view of such a point, and provides a method for heating a metal foil, which can convey the metal leaf while heating it while suppressing slack on one side in the width direction of the metal foil. There is something in it.

In order to solve the above problems, the metal foil heating device according to the present invention is a metal foil that heats the metal foil while transporting the strip-shaped metal foil with a plurality of rolls including at least a first roll and a second roll. It is a heating method, in which the heating method measures the tensions at both ends of the metal foil in the width direction while bleaching the metal of the metal foil conveyed between the first roll and the second roll. The position of the metal foil in the width direction is adjusted, and the tension at one end of the metal foil for which the tension is measured is T1, the tension at the other end is T2, and the width of the metal foil is L. Then, based on the following equation 1, the width direction of the metal foil is such that the position in the width direction of the metal foil moves by ΔL to the side where the high tension is measured among the tensions at both ends. It is characterized in that the above-mentioned position is adjusted.
ΔL = | T1-T2 | / (T1 + T2) × L ... (Equation 1)

According to the present invention, the metal foil conveyed between the first roll and the second roll is annealed. Here, when the temperature distribution in the width direction of the heated metal foil during transportation is not uniform, the portion of the metal foil on the higher temperature side is larger than the portion of the metal foil on the lower temperature side in the width direction of the metal foil. May stretch and loosen. As a result, the tension on the side where the end of the metal foil is loosened is lower than the tension on the opposite side (the side that is not loosened).

Therefore, in the present invention, the position in the width direction of the metal foil is set so that the position in the width direction of the metal foil moves to the side where the high tension is measured among the tensions at both ends of the metal foil whose tension is measured. Make adjustments. Specifically, as shown in Equation 1 described above, the width direction of the metal foil is such that the position in the width direction of the metal foil moves by ΔL to the side where the high tension is measured according to the tension difference between both ends. Adjust the position of.

As a result, the portion of the metal foil on the higher temperature side can be moved to the lower temperature side in the width direction of the metal foil, so that the elongation difference due to the temperature distribution of the metal foil can be reduced. As a result, the tension in the width direction can be made more uniform while suppressing the difference in slack at both ends of the metal foil, so that the meandering of the conveyed metal foil can be suppressed.

It is a schematic cross-sectional view of the metal leaf heating apparatus which concerns on this embodiment. It is a flow chart for demonstrating the heating method of the metal foil by the heating apparatus shown in FIG. (A) to (c) are schematic perspective views for explaining the behavior of the metal leaf in a heating device.

Hereinafter, this embodiment will be described with reference to FIGS. 1 to 3.

1. 1. About the heating device 1 of the metal foil M As shown in FIG. 1, the heating device 1 according to the present embodiment conveys the strip-shaped metal foil M by a plurality of rolls including at least the first roll 12 and the second roll 13. However, it is a metal foil heating device that heats the metal foil M.

The metal foil M is conveyed by a roll-to-roll method, and is conveyed by unwinding the metal foil M wound in a roll shape, passing through the heating device 1, and then winding the metal foil M in a roll shape. The metal foil M is, for example, a metal foil, and is not particularly limited as long as it has flexibility, and examples thereof include titanium foil, and the thickness thereof may be in the range of 10 μm to 1000 μm. It is preferably, more preferably, in the range of 10 μm to 200 μm. The tension of the metal leaf M passing through the heating device 1 may be applied, for example, by changing the winding speed at the time of winding, and the tension adjusting mechanism generally known in the plate passing technique. The method of applying tension to the metal foil M is not particularly limited.

The heating device 1 includes an annealing furnace 11 for annealing the metal of the metal leaf M conveyed between the first roll 12 and the second roll 13. In the annealing furnace 11, the metal leaf M is heated by a heating device (not shown) such as an electric heater arranged inside.

Here, for example, when the metal foil M is titanium or a titanium alloy, it is heated at 700 ° C. or higher in the annealing furnace 11. As a result, the titanium or the titanium alloy of the metal foil M is annealed.

The heating device 1 includes a tension measuring unit 14 that measures the tension at both ends of the metal foil M in the width direction. Specifically, the tension measuring unit 14 is a pair of load cells attached to both ends of the first roll 12. The load cell measures the load acting on the first roll 12 by the tension of the metal foil M. Therefore, the tension at both ends of the metal foil M in the width direction is calculated from the load of the load cell.

In addition, the tension measuring unit 14 may be a pressure measuring device provided with a piezoelectric element arranged on the surface of the first roll 12. In this case, in the portion where the metal leaf M is wound around the first roll 12, the surface pressure acting on the metal leaf M is measured by a piezoelectric element, and the tension at both ends of the metal leaf M in the width direction is measured from the measured surface pressure. It is calculated.

The heating device 1 includes a position detecting unit 15 that detects the position of the metal foil M in the width direction, and a position adjusting unit 16 that adjusts the position of the metal foil M in the width direction. The position detection unit 15 includes a pair of electrodes 15a and 15b, applies a potential difference between the pair of electrodes 15a and 15b, and forms an electric line of force between them, and the pair of electrodes 15a. By transporting the metal foil M between the 15b and 15b, both ends of the metal foil M in the width direction are detected from the amount of change in the electric lines of force. This makes it possible to calculate how much the metal leaf M is displaced in the width direction.

Further, the position adjusting unit 16 includes a roll body 16a and a pivoting unit 16b that pivots the rotation axis of the roll body 16a with respect to the transport direction of the metal foil M. The pivot portion 16b pivots the roll body 16a so that the position in the width direction of the metal foil M detected by the position detection unit 15 becomes the target position. In the present embodiment, the roll body 16a is pivoted by the pivot portion 16b, but for example, instead of the pivot portion 16b, a moving portion that moves the roll body 16a along the rotation axis may be provided. good.

In the present embodiment, the position adjusting unit 16 has T1 as the tension of one end ma of the metal leaf M measured by the tension measuring unit 14, T2 as the tension of the other end mb of the metal foil M, and L as the width of the metal foil M. Occasionally, the position of the metal leaf in the width direction is adjusted based on Equation 1.

ΔL = | T1-T2 | / (T1 + T2) × L ... (Equation 1)

Specifically, the position adjusting unit 16 moves the position in the width direction of the metal foil M by ΔL with respect to the side where the high tension is measured among the tensions at both ends in the width direction of the metal foil M. Adjust the position of. The position adjustment by the position adjusting unit 16 may be performed, for example, when the values of the tensions T1 and T2 are different, and may be performed, for example, when the values of | T1-T2 | become a predetermined magnitude or more. good.

2. 2. About the heating method of the metal leaf M The heating method of the metal leaf M using the heating device 1 shown in FIG. 1 will be described below. First, as shown in FIG. 2, in the unwinding step S21, the metal foil M is unwound from the metal foil M wound in a roll shape.

In the annealing step S22, the unwound metal foil M is passed through the heating device 1, and the metal foil M is annealed. The annealed metal leaf M is finally wound into a roll in the winding step S23 shown in FIG.

Here, in the annealing step S22, the tensions T1 of the ends ma and mb of the metal leaf M at the start of transportation of the metal leaf M transported between the first roll 12 and the second roll 13 to the annealing furnace 11 are T2 is substantially the same as shown in FIG. 3 (a).

However, due to variations in the temperature distribution due to heating in the annealing furnace 11, the temperature on the other end mb side may be higher than the temperature on the one end ma side of the metal foil M in the width direction of the metal foil M. As a result, the other end mb side of the metal leaf M having a high temperature may extend and loosen more than the ma side of one end of the metal leaf M having a low temperature (see, for example, FIG. 3B).

Due to this slack, the tension T2 of the loose other end mb of the metal leaf M becomes lower than the tension T1 of one end ma, and when the metal leaf M is continuously conveyed in this state, the metal leaf M becomes inside the annealing furnace 11. There is a risk of meandering. When such meandering of the metal foil M occurs, it may be necessary to reduce the transport speed of the metal foil M.

Therefore, in the present embodiment, the position of the metal leaf M in the width direction is moved to the side where the high tension is measured among the tensions of both ends ma and mb of the metal leaf M measured by the tension measuring unit 14. The adjusting unit 16 adjusts the position of the metal foil M in the width direction.

For example, in the case of the state shown in FIG. 3B, the position of the metal foil M in the width direction has a high tension according to the tension difference | T1-T2 | between both ends ma and mb as in the above equation 1. The position of the metal foil M in the width direction is adjusted so as to move by ΔL toward one end ma side where T1 is measured (see FIG. 3C).

As a result, in the width direction of the metal foil M, the metal foil M is brought closer to one end ma side of the metal foil M having a low temperature, so that the elongation difference due to the temperature distribution of the metal foil M can be reduced. As a result, the tensions T1 and T2 in the width direction of the metal foil M can be made more uniform, the meandering of the metal leaf M to be conveyed can be suppressed, and the conveying speed of the metal foil M can be increased.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs are designed without departing from the spirit of the present invention described in the claims. You can make changes.

1: Heating device, 11: Annealing furnace, 12: 1st roll, 13: 2nd roll, 14: Tension measurement unit, 15: Position detection unit, 16: Position adjustment unit, M: Metal leaf, ma: One end, mb : The other end

Claims (1)

A method for heating a metal foil, which heats the metal foil while transporting the band-shaped metal foil with a plurality of rolls including at least a first roll and a second roll.
The heating method is
While annealing the metal of the metal foil conveyed between the first roll and the second roll, the tensions at both ends of the metal foil in the width direction are measured, and the position of the metal foil in the width direction is adjusted. And to do,
When the tension at one end of the metal foil for which the tension was measured is T1, the tension at the other end is T2, and the width of the metal foil is L, among the tensions at both ends, based on the following equation 1. A method for heating a metal foil, which comprises adjusting the position in the width direction of the metal foil so that the position in the width direction of the metal foil moves by ΔL to the side where a high tension is measured.
ΔL = | T1-T2 | / (T1 + T2) × L ... (Equation 1)

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