JPS6136063B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an aluminum alloy for die casting whose basic composition is A6063 aluminum sash waste. Traditionally, Al was used as a die-casting alloy for anodizing.
-Mg-based ADC-5 and ADC-6 are known, but such alloys have poor castability such as hot water circulation and seizure, and although anodizing treatment is possible, the resulting film has poor appearance. (color tone) has poor commercial value,
The reality is that it is not used in products that require aesthetic appearance. In addition, with the spread of aluminum sash in recent years, it has been considered to effectively utilize aluminum sash as waste material.
Since A6063 alloy is originally a material for wrought materials, when it is used as an alloy for die casting, hot cracking occurs severely and forming is difficult. Therefore, the object of the present invention is to provide a die-casting alloy that can effectively utilize the aluminum sash waste material and has good anodic oxidation properties by modifying the above-mentioned aluminum sash waste material by adding appropriate ingredients in appropriate amounts. . The aluminum alloy for die casting of the present invention will be explained in detail below. Aluminum sash waste material, namely A6063 alloy, has Cu0.10
% or less, Si0.20~0.6%, Fe0.35% or less, Mn0.10
% or less, Mg0.45~0.9%, Zn0.10% or less, Cr0.10
% or less, Ti 0.10% or less, impurities 0.15% or less, balance
Since it is made of Al, the basic component composition is the aluminum sash waste material mentioned above, and Ti and Fe are added thereto.
Regarding the composition of the above-mentioned known aluminum sash waste material, if Mg is 0.45% or less or Si is 0.20% or less, the tensile strength of the alloy is insufficient, and if Mg is 0.9% or more or Si is 0.6% or more, the color tone of the anodized film is affected. spoil. Ti prevents hot cracking during casting by refining crystal grains,
Fe improves die casting properties such as seizure properties and mold release properties, and strength. However, excessive addition of both Ti and Fe impairs anodic oxidation properties. If the amount of Ti added is less than 0.06%, the above effects will be diminished, and if the amount added is more than 0.15%, it will have a negative effect on the color tone of the anodic oxide film. In addition, if the amount of Fe added is less than 0.6%, the above effects will be weak, and if the amount added is more than 1.5%, the anodizing property will be reduced.
In particular, it adversely affects color tone and deteriorates corrosion resistance. It is preferable that the addition amount is 0.06 to 0.15% of Ti and 0.6 to 1.5% of Fe as a range of components that can obtain good results without impairing both the above-mentioned castability and anodizing property. Therefore, in the present invention, 0.6 to 1.5% of Fe and 0.06 to 0.15% of Ti are added to A6063-based sash waste material. Thus, in order to perform anodizing treatment on a die-cast product formed from the alloy according to the present invention, after optionally performing machining, paper finishing, facing, polishing, etc., it is degreased and then anodized by a conventional method. → When the pore sealing treatment is performed, a milky white to almost transparent silvery white film can be produced. Example casting conditions Casting machine Horizontal cold chamber die casting machine (clamping pressure 250t) Casting temperature 760℃ Mold temperature 160℃ Plunger speed 1.0m/sec Casting pressure 760Kg/cm ² Die-casting product Wheel center cap (70 ×70 ^H m/m Wall thickness 3m/m Anodizing conditions H ₂ SO ₄ 15% Liquid Temperature 20℃ Current density 2A/dm ² hours 10 minutes Anodizing process Solvent degreasing → Alkaline degreasing → Neutralization (10%HNO ₃ ) →Anodizing→Sealing→Hot water wash die casting product surface finishing Brace→Cutting→Polishing

【table】

[Table] As explained above, according to the alloy according to the present invention, an alloy for die casting with good anodic oxidation property, which has mass productivity and commercial value in terms of castability and aesthetic appearance after anodization, can be produced by utilizing A6063 series aluminum sash waste material. can be provided. Therefore, molded articles die-cast using the alloy of the present invention have the advantage that a chemical polishing step can be omitted in the anodizing treatment step, so that a product with a beautiful appearance and a silver coating can be easily obtained.

Claims (1)

[Claims] 1 Cu0.1% or less, Si0.20-0.60%, Fe0.6-1.9
%, Mn 0.1% or less, Mg 0.45-0.90%, Zn 0.10% or less, Cr 0.10% or less, Ti 0.06-0.25%, impurities 0.15
Aluminum alloy for die casting consisting of % or less, the balance Al.