JP3129139B2 - Aluminum plate for forming process with excellent formability and anodizing property - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum sheet for forming used in machine parts, building materials, automobile parts, household goods, home electric parts, vehicle interior / exterior materials, and the like. The present invention relates to an aluminum plate material for forming which is excellent in formability and excellent in anodic oxidation treatment without using an agent. In this specification, unless otherwise specified, the term aluminum plate is used to include a pure aluminum plate and an aluminum alloy plate.

[0002]

2. Description of the Related Art Aluminum sheet materials for forming are light,
Since it is easily formed, it is press-formed into machine parts, building materials, automobile parts, household goods, home electric parts, vehicle interior / exterior materials and the like, and is widely used.

When performing press forming or the like using an aluminum plate material for forming, if the lubrication between the press die and the plate material is insufficient, the plate material is locally seized to the die during press forming, and In general, a liquid lubricant is applied to the surface of a plate material at the time of press forming, and press forming is performed since cracks may occur in the sheet or it may not be possible to form into a target shape.

However, if an oily liquid lubricant is used during press molding, the working environment of the press is deteriorated by the lubricant. Further, if an oily lubricant is used, it is necessary to degrease with an organic solvent such as trichloroethylene after press molding. In recent years, there has been a tendency not to use organic solvents such as trichloroethylene for the purpose of preventing the destruction of the ozone layer and preserving the global environment. It is rare.

For this reason, there is no need for press oil in which a chromate layer is formed as a first layer on the surface of a forming aluminum plate and a second layer of an organic resin containing a lubricant is formed thereon. Press formability, scratch resistance,
A composite coated aluminum plate or an aluminum alloy plate excellent in thread rust resistance and sharpness has been proposed (Japanese Patent Laid-Open No. Hei 5-
311454 gazette).

[0006]

The above mechanical parts, building materials,
Aluminum or aluminum alloy members press-formed on automobile parts, household goods, home electric parts, vehicle interior / exterior materials, and the like are often subjected to anodizing treatment and painting for anticorrosion, aesthetics, and the like. However, the above-mentioned Japanese Patent Application Laid-Open No. 5-31145.
No. 4, the composite coated aluminum plate or aluminum alloy plate excellent in press formability, scratch resistance, thread rust resistance and sharpness described in JP-A No. 4 (1993) has a chromate film and a nonconductive organic resin layer. In addition, there is no problem in coating after molding, but there is a problem that anodizing treatment cannot be performed.

The inventors of the present invention have conducted various studies on a lubricating organic resin film which can be easily removed by washing with water, an alkali treatment, etc., which is a step prior to the anodizing treatment, and does not hinder the subsequent anodizing treatment. An organic resin film having sufficient lubricity required for press molding and easily removable by washing or alkali treatment was found.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide sufficient lubricity required for molding without using a liquid lubricant and moldability capable of performing anodic oxidation satisfactorily. Another object of the present invention is to provide an aluminum plate material for forming and processing excellent in anodizing property.

[0009]

In order to achieve the above object, the present invention provides a pure aluminum plate or an aluminum alloy plate.
Form a lubricating organic film with lubricity on the surface of the material,
The lubricating organic film has low water-soluble and alkali-removing properties.
Polyethylene curable by ultraviolet rays
Polyester wax and polyester
One or both of the olefin waxes are dispersed .

[0010]

[0011]

[0012]

[Function] By forming a lubricating organic film in which lubricating wax is dispersed on the surface of an aluminum plate material, forming processing,
For example, press oil which is a liquid lubricant may not be used in press molding. Further, since this lubricating organic film is composed of an organic substance which is water-soluble and can be completely removed easily or an alkali film-removing property, that is, an organic substance which can be completely completely removed with alkali, excellent press formability and after press molding can be obtained. It is possible to satisfy the requirements such as the need for washing the press oil with an organic solvent and the excellent anodizing property.

In the present specification, unless otherwise specified, the term water-soluble is used as a property of dissolving in a neutral aqueous solution, a weak alkaline aqueous solution, a non-fluorocarbon detergent and the like.

The aluminum plate is not particularly limited and can be selected depending on the application. For example, in the case of a member requiring strength such as a mechanical part or an automobile part, an Al—Mg based alloy containing 2 to 6% of Mg,
g 0.5-1.0%, Si 0.5-1.0%, Cu
Al-Mg-Si based alloy containing 0 to 0.5% is pure aluminum for industrial use and Mn is 0.5 to 1.5 for building materials.
%, An Al-Mn-based alloy containing 0.0 to 2.0% of Mg, an Al-Si-based alloy containing 1 to 6% of Si, etc. M
It is preferable to use an Al-Mg alloy containing 0.3 to 3.0% of g.

It is preferable that the aluminum plate material has a clean surface by an alkali degreasing treatment or the like as a pretreatment before the organic coating treatment.

The water-soluble organic film is not particularly limited as long as it has good water-solubility. However, considering the solubility in water, a single or mixture of water-soluble polyesters and water-soluble polyamides is preferred. Is preferred. A preferred ratio in the case of mixing is 10 to 90% of a water-soluble polyester. The thickness of the organic film is preferably 0.3 to 3.0 μm. When the thickness of the organic film is less than 0.3 μm, the lubricity during molding is insufficient, and the thickness of the organic film is 3.0 μm.
When the value exceeds, the effect is saturated, and further degreasing takes time, which is uneconomical.

As an organic film which can be easily removed with an alkali,
There is no particular limitation so long as it has good removability, but in consideration of the removal efficiency, a polyester acrylate polymer film that is cured by ultraviolet rays is preferable. That is, polyester acrylate is used as the prepolymer, and acrylate and phosphate esters of methacrylate are suitable as the polymerizable monomer. Benzoin ethers, benzophenones, xanthones, and acetophenone derivatives are suitable as the photopolymerization initiator. . The thickness of the organic film is preferably 0.3 to 3.0 μm. When the thickness of the organic film is less than 0.3 μm, the lubricity at the time of molding is insufficient, and when the thickness of the organic film exceeds 3.0 μm, the effect is saturated, and the time for removing the film is further increased. This is uneconomical.

On the other hand, the wax as a lubricant to be added to the organic resin is preferably a polyethylene-based or polyolefin-based wax, and these may be added alone or in combination. 30% is preferred. If the addition amount is less than 5%, the effect as a lubricant is small and the moldability tends to be poor. If the amount exceeds 30%
The effect is saturated and uneconomical.

The above-mentioned organic resin to which the lubricant wax has been added is applied to a predetermined film thickness by a general method such as roll coater application, spray application, dipping (immersion) application, and the like. 10 to 120 at ℃
Bake for seconds. Maximum temperature of material at this time (PMT)
Is preferably 60 to 250 ° C.

[0020]

EXAMPLES Table 1 shows the composition of the aluminum plate material used as the test material used in this example and the comparative example, and the material and temper were A1100-O. Based on Al, S by mass%
i is 0.10%, Fe is 0.55%, Cu is 0.12%
Others contain trace amounts of Mg, Zn, Mn and Ti. The board thickness used was 1.0 mm.

Tables 2 to 4 show the organic films formed on the test materials of this example and comparative examples. Examples and comparative examples are based treatment, organic film (type of film, film thickness),
Each wax column is shown separately by the number shown in the number column. Numbers 1 to 8 and 13 to 19 indicate examples of the present invention, and numbers 9 to 12 and 20 to 22 indicate comparative examples.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

[Table 4]

The test materials were evaluated as follows: 1) The formability was evaluated by the dynamic friction coefficient and the limit drawing ratio (drawability).
2) Anodizing property, which is anodizing property, was determined based on the film removing property of the organic film and the alumite appearance. That is, the measurement of the coefficient of kinetic friction The pressing force in a non-lubricated state by a mold having two parallel surfaces is 2.0 to 4.0. Hold the test piece at 0 kN,
The force required to pull out at a speed of 160 mm / min was determined, and the dynamic friction coefficient was determined by the following equation.

Coefficient of kinetic friction μ = P / 2F where P: pull-out force, F: holding force Judgment of result ○: less than 0.10, Δ: 0.10 to 0.2
0, ×: over 0.20 Limit drawing ratio Punch diameter: 33 mm, punch and die shoulder radius: 3 mm
Deep drawing test using a mold with a wrinkle holding force of 100
The maximum draw ratio that can be molded without breaking without breaking in kgf was determined and defined as the limit draw ratio.

Judgment of result ○: 2.05 or more, Δ: 2.0
4 to 1.90, ×; less than 1.90 Membrane removal Immersion in water at 60 ° C. for 60 seconds or 10% NaOH at 40 ° C.
Immerse in an aqueous solution for 60 seconds. It was visually determined whether the film could be removed by any of the methods.

Judgment of results ○: Completely removable, △: Almost completely removable, ×: Non-removable Alumite appearance Anode at current density of 1 A / dm ² in 15% H ₂ SO ₄ aqueous solution Oxidation treatment was performed, and the surface of the plate material with a 9 μm alumite film was visually observed.

Judgment of the results ×: good, ×: poor (unevenness on the surface) Comprehensive evaluation ○: particularly good, ；: good, ×: poor Tables 5 and 6 show the tests of Examples and Comparative Examples of the present invention. It shows the results. That is, in Tables 5 and 6, numbers 1 to 8
In this example, it was found that the moldability was good and the film was sufficiently removed by washing with water, so that the alumite appearance was uniformly good.

Nos. 9 to 12 are comparative examples. In No. 9, since the surface of the test material was treated with phosphoric acid chromate, the film was removed by washing with water, but the phosphoric acid chromate layer remained and the alumite appearance was poor. It is. In No. 10, since a wax for imparting lubricity was not added to the organic film, seizure and fracture occurred, and both the dynamic friction coefficient and the moldability were poor. In Nos. 11 and 12, the organic film was insoluble in water and could not be removed by washing with water, and the alumite appearance was poor.

Nos. 13 to 19 are examples of the present invention, which show that the moldability is good, and that the film is sufficiently removed by washing with an alkaline solution, so that the alumite appearance is good.

Nos. 20 to 22 are comparative examples.
Since no wax for imparting lubricity is added to the organic film, seizure and breakage occur, and both the dynamic friction coefficient and drawability are poor. In the case of No. 21, the organic film could not be removed by washing with an alkali solution, and the alumite appearance was poor. In No. 22, since the surface of the test material was treated with phosphoric acid chromate, the film was removed by washing with an alkaline solution, but the phosphoric acid chromate layer remained and the alumite appearance was poor.

[0034]

[Table 5]

[0035]

[Table 6]

As described above, in the embodiment of the present invention, the lubricating organic film having good water-soluble or alkali-removing properties is applied and formed on the surface of the aluminum plate material for forming, so that the press oil can be formed at the time of press forming. Press molding can be performed in an unnecessary and clean working environment, and degreasing after press molding is unnecessary, so there is no need to use an organic solvent such as trichloroethylene, which causes destruction of the global environment due to destruction of the ozone layer. Since it can be easily and completely removed later with water or an alkaline solution, it has excellent effects such as excellent alumite treatment and has great industrial value.

Although the embodiments and comparative examples of the present invention have been described in detail above, the present invention is not limited to these embodiments and various modifications can be made without departing from the spirit of the present invention. It goes without saying that a wide variety of modifications can be made by adding.

[0038]

According to the present invention, since the aluminum sheet for forming is coated with a lubricating organic film having lubricity excellent in at least one of water-solubility and alkali film-removing properties, press oil It has excellent moldability even without using a liquid lubricant such as a liquid lubricant, and eliminates the need to wash a liquid lubricant such as a press oil with an organic solvent after molding. On the other hand, the anodic oxidation treatment can be favorably performed by washing with water, removing the film with an alkali, or washing and removing the film with both water and an alkali.

[0039]

Further , according to the present invention, since the lubricating organic film is obtained by dispersing one or both of a polyethylene wax and a polyolefin wax in a polyester acrylate resin which is cured by ultraviolet rays, it can be easily treated with an alkali. Removal is possible, and the removal efficiency at that time is even better.

Continuation of the front page (72) Inventor Watasugi Hagisawa 1-34-1, Kabara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Inside Nikkei Giken Co., Ltd. (72) Muneyoshi Matsushita 1-34, Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture No. 1 Inside Nikkei Giken (56) References JP-A-6-146001 (JP, A) JP-A-6-184587 (JP, A) JP-A-7-11089 (JP, A) (58) Surveyed field (Int. Cl. ⁷ , DB name) B32B 15/08 B05D 7/14 C25D 11/16 302

Claims (1)

(57) [Claims] 1. A pure aluminum plate or an aluminum alloy
Form a lubricating organic film with lubricity on the surface of the sheet metal
And the lubricating organic film has a water-soluble property and an alkali film-removing property.
One that excels in at least one and is cured by ultraviolet light
Polyester wax for ester acrylate resin
And one or both of the polyolefin wax and
An aluminum plate material for forming process excellent in formability and anodizing property, characterized in that it is made of aluminum.