JPS60262639A - Manufacture of molded shape using aluminum or aluminum alloyas base material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for manufacturing a molded product made of aluminum or an aluminum alloy as a base material, and more specifically, to a method for manufacturing a molded product made of aluminum or an aluminum alloy as a base material.
1-Relates to a method of manufacturing a cylindrical molded product with one end closed, which is used for a lid, an umbrella handle, a dial, a push button, etc., from a plate material made of aluminum or an aluminum alloy by press drawing.

[Prior Art] Molded products made of aluminum or aluminum alloy have the beauty of the metal's inherent luster and beauty due to their surface treatment.
Because of its luxurious feel, it is often used as an exterior material for cosmetic container tops, umbrella handles, dials, push buttons, etc.

In conventional molded products of this type, an aluminum oxide film of several seven micrometers or more is formed on the surface by anodizing to obtain a decorative effect, surface hardness, and corrosion resistance, but this aluminum oxide film layer is ductile. If this coating layer is formed before molding and then press drawing is performed, cracks will appear on the surface. Therefore, first mold it into the desired shape and then individually anodize the surface of the molded product. It was being processed. In addition, printing and surface treatment for decoration must be performed after the aluminum oxide film is formed, so these treatments have to be performed on three-dimensional molded products, resulting in very low production efficiency. That is why the cost was so high.

[Problems to be Solved by the Invention] The present invention has been made to solve the problems of the prior art, and has a decorative effect comparable to that of conventional products by anodic oxidation.
An object of the present invention is to provide a method for manufacturing a molded product by press drawing from a plate material made of aluminum or an aluminum alloy, which can obtain surface hardness and corrosion resistance, and can significantly reduce manufacturing costs.

[Means for Solving the Problems] The method of the present invention involves surface-treating an aluminum or aluminum alloy material in its flat state, and then forming it by press drawing. It is characterized by its surface treatment method.

That is, a plate material made of aluminum or an aluminum alloy is first oxidized to form an oxidized layer on its surface. This oxidized layer has poor ductility, so its thickness is 5.
The thickness is less than a micron, preferably less than 1 micron. It is desirable to use saliva with a layer thickness of 5 microns or more.

Next, an intermediate layer made of soft plastic is formed on the oxidized layer. As this soft plastic, polyvinyl chloride, ethylene-vinyl acetate copolymer, and other resins can be used, and polyvinyl chloride is preferable when a decorative pattern is printed on this intermediate layer.

Furthermore, a covering layer made of hard plastic is formed on this intermediate layer. Since this coating layer serves as a protective coating, its material is selected from resins having sufficient surface hardness. Typical examples include polyurethane-based and polyacrylic-based resins.

After surface-treating an aluminum or aluminum alloy plate using the above method, press drawing can be performed to obtain a surface-treated molded product as is. In order to increase production efficiency, usually a wide-area root blade is surface-treated and then punched out and simultaneously press-drawn, but it is also possible to use plate materials that correspond to individual molded products. It is effective to use a device called a flow coater to uniformly coat and curve the surface of a wide-area board with plastic. Molded products are used as these exterior parts using, for example, a molded part made of plastic or the like as a core material.

[Action Co. Next, the operation of the present invention will be explained.

According to the method of the present invention, it is possible to form aluminum or aluminum alloy material without producing cranks even if the material is press-drawn after surface treatment without leaving it in a flat state. This is due to the unique laminated structure formed by the method of the invention.

In other words, mellowing place Fl! The layer has a corrosion-resistant effect and also has the effect of improving the adhesion of the soft plastic intermediate layer to the substrate made of aluminum or an aluminum alloy. Since the layer thickness of the intoxicating treatment ff/Ff is limited to 5 microns or less, no cranking occurs even when press drawing is performed. Since the layer thickness is limited, concerns about platinum properties and surface hardness are relatively reduced, but this is compensated for by the intermediate layer and the covering layer made of hard plastic.

The intermediate layer made of soft plastic plays the role of a buffer material between the hard coating layer and the fermented layer, and absorbs the deviation between the two during molding.

The hard plastic coating serves as a protective coating and also has a decorative effect.

[Effects of the Invention] As described above, according to the method of the present invention, it is possible to perform surface treatment on the flat plate and then press-draw it without causing any cracks. Since it is possible to obtain a large number of surface-treated molded products at the same time by punching and press drawing from sheet materials, each product is individually subjected to anodic resistance (1) after molding. Manufacturing costs can be significantly reduced compared to conventional manufacturing methods.

Furthermore, the ability to perform surface treatment on a flat plate is extremely important in applying decorative patterns. That is, a decorative pattern can be easily applied to the surface of a plate made of aluminum or an aluminum alloy by mechanical processing such as spin processing or hairline processing, and then the oxidation treatment is performed to form an intermediate layer and a surface coating. If transparent plastic is used as the layer, it is possible to create a decorative molded product with a matte and luxurious feel. This matte pattern on the metal surface before the machine also serves to enhance the adhesion of the soft plastic interlayer to the surface. Furthermore, after applying a decorative pattern to the soft plastic intermediate layer by offset printing, a transparent coating layer made of hard plastic may be formed. In this case, the soft plastic intermediate layer is not only used as a cushioning material. , also serves as a base for printing.

Examples of the present invention are shown below.

[Example] The surface of an aluminum flat plate with a thickness of 0.5 mm was oxidized with a 0.5 volume: v1% heavy chlorine chloride solution, thoroughly washed with water, dried, and coated with polyhinyl chloride using a flow coater. It was coated with resin, and then coated with polyacrylic resin using the same flow coater. After the resin has sufficiently hardened, it is punched and press-drawn to a diameter of 50 mm.
A cylindrical molded product with a height of 40IIIffl and one end closed was obtained.

Cracks were observed on the surface of the molded product when the thickness of the oxidized layer using the weight comb acid solution was 5 microns or more.
When the layer thickness was less than this, no cranking occurred, and an appearance equivalent to that obtained when the surface was treated after molding could be obtained.

Patent applicant: Negi Seisakusho Co., Ltd.

Claims (1)

[Claims] (1) After oxidizing the surface of a plate material made of aluminum or an aluminum alloy to form a liquefied layer of 5 microns or less, an intermediate layer made of soft plastic is formed on the north side of the oxidized layer. Further, a coating layer made of hard plastic is formed on the intermediate layer, and the laminated structure plate material is formed by press drawing, and the processing is based on aluminum or aluminum alloy.Claims 4. A method for manufacturing a molded product using aluminum or an aluminum alloy as a base material according to pfS (1). (3) The method for producing a molded product using aluminum or an aluminum alloy as a base material according to claim (1), wherein the soft plastic is a polyvinyl chloride resin. (4) Claim No. 1, wherein the hard plastic is a polyurethane or polyacrylic resin.
Manufacturing capabilities for molded products made of aluminum or aluminum alloy as a base material as described in 2. (5) Aluminum or aluminum according to claim 1, in which a decorative pattern is applied to the surface of a plate material made of aluminum or an aluminum alloy by mechanical processing such as spin processing or hairline processing, and then the softening treatment is performed. A method for manufacturing molded products using aluminum alloy as a base material. (6) The aluminum or aluminum alloy according to claim (1) is used as a base material, and a decorative pattern is applied to the soft plastic intermediate layer 2 by offset printing, and then a covering layer made of hard plastic is formed. A method for manufacturing molded products. (7) Production of a molded product using aluminum or an aluminum alloy as a base material according to any one of claims (1) to (6), wherein the molded product has a cylindrical shape with one end closed. Method.