JPH11244910A - Manufacture of extremely thin metallic foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute foil rolling and extremely thin foil rolling in order by making a material into an apparently thick sheet combining the material into a sandwich-shape using a protective sheet and rolling the sandwich. SOLUTION: The sandwich is made of the total four sheets of two base stocks 2 for foils (materials for making foils by rolling) in the middle and on both outsides of which two protective sheets 1 for holding the base stocks for foils and, when it is rolled, the base stocks 2 for foils in the middle become the foils and the protective sheets 1 on the outsides become the base stocks for foils. The foils are obtained by separating the respective. The sandwich for rolling the extremely thin foil is composed of four sheets of two foils (the extremely thin foils are made by rolling and their thickness are (t)) in the middle and two new protective sheets for holding the two foils from both outsides and rolling is executed. By executing the foil rolling and extremely thin foil rolling, the foils and the extremely thin foils are rolled in order. At the time of rolling the sandwiches into desired thickness rolling may be executed dividing this draft into several passes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

[0002] Rolled ultra-thin metal foil manufacturing technology

[Prior art]

In the prior art, the metal foil has been manufactured by a precise rolling technique of a single plate or a two-ply plate. However, in the rolling of an extremely thin plate, the metal foil buckles with a small value of the radial component force of the roll, Defects often appeared on the surface state and shape.

[Problems to be solved by the invention]

An attempt was made to escape from this difficult area and to simply solve a foil rolling technique that does not cause defects in the surface properties or shape.

[Means for Solving the Problems]

[0005] For this purpose, the problem has been solved by using a protective plate, sandwiching an ultrathin foil for an ultrathin foil material to be rolled into an ultrathin foil, and rolling the apparently thick plate.
At this time, the protection plate is devised so as not to become a sacrificial material.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows the basic characteristics of the rolled load and the exit side plate thickness as the basic characteristics of the implemented rolling equipment. In this way, we recognized the difficulty of manufacturing foil by rolling a single plate, and in order to deal with this, devised a sandwich rolling to protect, and showed the harmony between the thickness assembly and the rolling reduction. 2
The conditions for peeling the sandwich are shown in FIG.
FIG. 4 shows the layout of a rolling facility for implementing the above.

【Example】

[0007] An aluminum plate having a purity of 99.3% by weight is used as a 100 mm width, and a work roll diameter is 100 m.
In a four-stage cold rolling mill having a m and a body length of 200 mm, a sandwich having t of 0.02 mm, m of 4, and n of 5 was assembled. Therefore, the protection plate thickness is 0.02 × 4 × 5 = 0.
4 mm, the foil thickness for ultra-thin foil material is 0.02 mm.
When four sheets are stacked, the sandwich thickness becomes 0.84 mm, and this is rolled to a quarter thickness 0.21 mm, and the rolling reduction is (0.84-0.21) /0.84×100%. = 75
%, The ultrathin foil thickness is 0.02 / 4 = 0.005 mm,
That is, it was finished to 5 μm.

EFFECTS OF THE INVENTION When one or two sheets are rolled on a 5-μm foil, defects such as herringbone and wrinkles usually occur frequently. However, the sandwich rolling according to the present invention did not have any fear. As described above, when harmonizing the thickness assembly and the rolling reduction of each layer of the sandwich, the foil rolling and the ultra-thin foil rolling (the present invention) can be sequentially performed.
That is, the previous foil material is finished as a foil, and this foil is finished as the next ultra-thin foil, and the previous protection plate can be used for the next foil material. A sandwich is formed and rolled in order.
Depending on the desired thickness of the foil and the ultrathin foil, m, n, and t may be harmoniously matched. No defects in surface quality and no sacrificial material.

[Brief description of the drawings]

Fig. 1 Measurement diagram of herringbone generation area As the basic characteristics of the rolling equipment, the initial roll opening and the initial roll preload are fixed variously, and plates (including foils) of various thicknesses are rolled therein, The relationship between the rolling load and the finished thickness (outside plate thickness) was measured, and eight characteristic curves were obtained. On this line, the generation points of herringbones (surface flaws, wrinkles, etc.) are linked to define three regions.

[Explanation of symbols]

1: Herringbone generation area, 2: Boundary area, 3: Herringbone non-generation area

FIG. 2 is an explanatory view of assembling a sandwich plate. A sandwich for foil rolling is composed of two foil materials (materials to be rolled into foil) in the center, two protective plates sandwiching the foil material on both outer sides,
When a total of four sheets are sandwiched and rolled, the central foil material becomes a foil material and the outer protective plate becomes a foil material. Peel each to obtain foil. The sandwich for ultra-thin foil rolling is composed of two foils (rolled into an ultra-thin foil, thickness t) in the center, sandwiched on both sides, sandwiched from both sides with two new protective plates, Roll into a sandwich. Foil rolling and ultra-thin foil rolling are performed in this order.

[Explanation of symbols]

 1: protection plate, 2: foil material, 3: foil, 4: ultra-thin foil

FIG. 3 Peeling strength between sandwich layers (compression strength) In the foil rolling and ultra-thin foil rolling (invention) of FIG. 2, when rolling to a desired thickness, the rolling reduction may be performed in several passes. The relationship between each pass and the peel strength at this time is shown.

[Explanation of symbols]

1: between the foil of the first pass and the foil, 2: between the foil of the first pass and the board,
3: Between the foil of the second pass, between the foils, 4: Between the foil of the second pass and the board,

FIG. 4 shows an example of rolling equipment. FIG. 4 shows an example of rolling equipment for realizing this method.

[Description of Signs] 1 ... Protection plate coil 2 ... Foil material coil 3 ...
Foil coil 4: Ultra-thin foil coil 5: Reversible cold rolling mill

Claims (2)

[Claims] (1) In a method for producing an ultrathin metal foil by rolling, materials are combined in a sandwich form,
A method for producing an ultra-thin metal foil, comprising sandwich rolling. 2. (1) The sandwich is made of four layers of a protective plate (thickness m × nxt), an ultrathin foil material foil (thickness t), an ultrathin foil material foil, and a protective plate. This is rolled under a total pressure to a thickness of 1 / m, the foil for a very thin foil material is rolled into a very thin foil (thickness t / m), and the protective plate is rolled into a foil material (thickness nxt). A method for producing an ultra-thin metal foil.