JPH05126504A - Method for measuring flatness of metal foil etc. - Google Patents

Abstract

PURPOSE:To obtain a flatness in a short time by applying, in parallel, reinforce ment materials at a constant spacing in a longitudinal direction of a metal foil, etc., which are wound in a coil, forming slits in the metal foil, etc., between the reinforcement materials, and then fixing the reinforcement materials to a measuring base and then measuring the amount of each slit sag. CONSTITUTION:The spacing of reinforcement materials is set to 30-70cm, the reinforcement materials are attached to the object to be measured, such as metal foil, perpendicularly to the longitudinal direction of the object and mutually in parallel. The foil is cut outside the reinforcement materials, and then slits are made in the foil between the reinforcement materials at intervals of approximately 50mm. Then, the reinforcement materials with the metal foil strips is placed on a flat base in a state that the strips slightly sag, the amount of sagging is measured by a dial gauge, and then the length of the foil is calculated according to it and the spacing of the reinforcement materials. The flatness epsiloni is obtained from this length according to an expression of epsiloni=(Li-L)/L, where Li is the length of each strip and L is the average length of the entire foil, thus achieving an accurate measurement in a short time.

Description

Detailed Description of the Invention

[0001]

The present invention relates to aluminum foil, steel foil,
Metal foils such as copper foils, or metal foils that cause troubles when processed in an automatic processing machine by a laminate of these metal foils and a synthetic resin film (in the present invention, these are collectively referred to as metal foils, etc.) The present invention relates to a method for measuring the flatness of the.

[0002]

2. Description of the Related Art Thin plates such as steel plates and aluminum plates are used for vehicles.
Since the beauty of home appliances, furniture, containers, and cans often affects the product value, quality (including surface condition) requirements are becoming severe, and the automation of secondary processing is significantly advanced. As a result, there has been a strong demand for shape measurement and production control of thin plates and foils that have been shipped in the form of coils.

For thin plates, a number of methods have been proposed as in-line shape detectors. These are roughly divided into two types: contact type and non-contact type. In contact type, there are distance method (mechanical contact, electrical contact, contact roller method, etc.) and roll method (hollow multi-division roll method, etc.). ,
As non-contact type, electromagnetic method (permeability method, coercive force method, etc.),
Displacement method (fluid ejection method, etc.), vibration method (elastic vibration method, mechanical vibration method, etc.), optical method (rod-shaped light source method, etc.), sound wave method,
There are methods such as temperature method (water column resistance method) and radiation method. These can be used for thin plates, but extremely thin ones such as metal foils such as aluminum foil cannot be used except for the hollow multi-division roll method.

This hollow multi-division roll method is considerably large in terms of equipment, and since it is necessary to pass through a specific pass line for measurement, it is necessary to measure aluminum foil wound on various spools. Has a problem that the coil detaching device becomes complicated. On the other hand, although there is a proposal for a method of off-line measurement, it has become clear that this method cannot perform accurate measurement.

In particular, the aluminum foil, which has the largest production volume, such as an extremely thin metal foil, has been made wider and thinner and the speed has been increased, and a foil having a width of 1600 mm can be rolled at a rolling speed of about 1500 m / min. , Foil thickness is 6 ~
The mainstream is about 9 μm. Foil shape control is an important factor that leads to not only product shape quality but also foil breakage during rolling when it becomes such a thin, and is one of the most important issues in actual operation.

However, with respect to such metal foils, there are few reports on the shape of the foil (mainly the distortion due to the nonuniformity of the length even if the thickness is uniform) because it is difficult to measure the shape. ..

A particular problem is that the actual data of the product cannot be accurately grasped because the data obtained varies due to the difference in the sampling method for measurement.

Therefore, one of the inventors of the present invention has developed a highly reliable measuring method for directly measuring the flatness by using a sample having a length corresponding to one turn of the coil, but it takes several hours for one measurement. Therefore, it was necessary to develop a simple and reliable measurement method.

[0009]

DISCLOSURE OF THE INVENTION The present invention uses an inexpensive apparatus for measuring the flatness of an extremely thin metal foil or the like wound in a coil shape, and measures the flatness of data in conformity with actual conditions in the shortest possible time. The purpose is to establish a method and secure data that contributes to the production of metal foils with superior shape quality.

[0010]

SUMMARY OF THE INVENTION According to the present invention, two reinforcing materials are attached in parallel at a constant interval in the winding length direction of a metal foil or the like wound in a coil shape, and then the space between the reinforcing materials is increased. Achieved the above-mentioned object by developing a flatness measuring method for metal foil, etc. by slitting metal foil etc., fixing a reinforcing material to a measuring table, and measuring the amount of deflection of each slit of metal foil etc. ..

As the metal foil or the like to which the present invention is applied, the present invention was carried out using an aluminum foil, and its effectiveness was shown. However, the method of the present invention is not limited to aluminum foil, as can be understood by those skilled in the art. Needless to say, the present invention can be applied to other metal foils such as iron and copper, or to a laminate of a synthetic resin film on a metal foil.

As the reinforcing material used in the present invention,
Since the length is longer than the width of the coil such as metal foil, and it is necessary to stick at a constant interval in the length direction of the metal foil, the sticking surface is a flat surface and is made of a surface facing other reinforcing materials. The corners should have straight lines that are as accurate as possible. This angle is usually a right angle, but it may be slightly acute or obtuse.

The thickness should be selected so that it has a certain degree of flexibility and rigidity so that it can be closely attached to the coil when pressed against a metal foil or the like.

Considering the case of slitting, the material is preferably a material such as aluminum or steel that is not easily scratched by a cutter, but may be a material such as plastic or bamboo.

As an adhesive for attaching the reinforcing material to a metal foil or the like, an adhesive such as a synthetic rubber or acrylic adhesive, or an adhesive such as cyanoacrylate or epoxy resin can be used. Considering the properties and adhesive strength, acrylic adhesives seem to be preferable. In particular, the double-sided adhesive tape is attached to the reinforcing material so as to slightly stick out, and the protruding portion is cut off with a cutter knife, whereby the end portion can be easily made straight.

When the reinforcing material is attached to a metal foil or the like, the distance between them may be about 30 to 70 cm. If the interval is narrower than this, the measurement accuracy is lowered, and if the interval is wider than this, the measurement accuracy is improved, but the convenience of the measurement is lost.

When the shape of the coil is large, it is easy to widen the gap, and when the shape of the coil is small, it is easier to attach the narrower.

For attaching, both reinforcing materials are preferably perpendicular to and parallel to the length direction of the metal foil or the like. Of course, correction may be made even if it is not perpendicular to the length direction, or if it is not parallel, but the calculation calculation becomes troublesome.

In this case, what is important is that the reinforcing material needs to be attached to a place in a coiled state. When the coil is rewound and pasted, an error occurs. When the reinforcing material is attached and fixed to a metal foil or the like, it is cut outside the reinforcing material, and then accurately slit to a width of about 50 mm in the foil length direction (right angle to the reinforcing material) up to the reinforcing material. Next, the length of each slit strip is measured. As a measuring method, as shown in FIG. 2, a reinforcing material having slits such as metal foil stuck on a flat table is fixed in a slightly slack state, and the amount of slack is measured with a dial gauge. Calculate the foil length from the interval. From this length, the flatness εi
Is calculated by the following formula. εi = (Li-L) / L (where L is the average length of the entire foil, Li is the length of each strip)

[0020]

[Function] Metal foil is currently supplied to the user in the form of a coil, which is subjected to secondary processing, most of which is supplied to automated processing machines. Higher flatness is required. However, there was little agreement between the results of measuring the flatness of these metal foils and the claims at the foil manufacturing stage, and the cause was unknown.

However, the present inventor has found that a cause of this is that a large error will occur if the metal foil or the like is once cut off from the coil and is measured as a cut sample, and the length of one round of the coil is measured for reliable measurement. Although the method was developed, it was confirmed that the method of the present invention can obtain almost the same result even if the sample length of the metal foil or the like is shortened by attaching and fixing the reinforcing material to the metal foil or the like in the coil state. Then, the present invention has been completed.

[0022]

【Example】

(Example 1) Thickness 6.8 μm, width 1335 mm, 1N3
A rolled coil of 0 aluminum foil is used, and the wound coil portion has a gap 50 in the length direction as shown in FIG.
In cm, attach the reinforcing material of the aluminum plate attached to the double-sided adhesive tape with the acrylic adhesive, then cut it off from the coil, and remove the aluminum foil between the reinforcing materials by 5
The flatness was calculated by slitting at 0 mm intervals and measuring the length of each strip with a dial gauge. The results are shown in Figure 3.

In order to confirm this accuracy, a scribing line is attached to the same coil at a right angle to the lengthwise direction, cut from about 10 cm outside the mark, and a sample of one round (coil diameter of about 1338 mm) is cut. It was collected.

This is slit into a width of 50 mm, each strip is placed on a measuring table, a weight is attached to the end outside one of the marks, and the deviation from the reference line is 0.1 mm with a loupe with a scale.
The unit was read and the flatness was calculated.

The results are also shown in FIG. As shown in Fig. 3, the result of a simple method in which a reinforcing material is attached and the sample length is 500 mm and the measurement length is lengthened and the measurement accuracy is improved. It can be seen that matching results are obtained within the range.

(Comparative Example) The aluminum foil coil used in Example 1 was rewound, cut off, and allowed to stand at room temperature for 1 hour.
A reinforcing material was adhered to, and the length of each strip was measured in the same manner as in Example 1 to calculate the flatness. The results are shown in Figure 3. From this result, it was found that when the cut sample was used, the distortion of the foil was relieved in a short time, and the value became flatter than the actual flatness.

[0027]

[Effects of the Invention] By shortening the measurement section by attaching a reinforcing material to a coil-shaped metal foil or the like and slitting the foil between the reinforcing materials in the longitudinal direction and measuring the length distribution in the width direction. It became possible to obtain accurate flatness in a short time using a simple measuring instrument.

[Brief description of drawings]

FIG. 1 shows a state in which a reinforcing material is attached to a coil such as a metal foil.

[FIG. 2] A metal foil or the like between the reinforcing materials is slit, and the amount of slack is measured with a dial gauge.

FIG. 3 shows the results in the examples.

Claims (1)

[Claims] 1. Reinforcement is performed by sticking two reinforcing materials in parallel at a constant interval in the winding length direction of a coiled metal foil or the like, and then slitting the metal foil or the like between the reinforcing materials. A flatness measuring method for a metal foil or the like by fixing the material on a measuring table and measuring the amount of deflection of each slit of the metal foil or the like.