What are the common surface treatment processes for aluminum alloy die castings

What are the common surface treatment processes for aluminum alloy die castings

With the rapid development of the domestic aluminum alloy die-casting industry as a whole and continuous innovation in technical strength, the surface treatment technology of aluminum alloy die-casting parts and castings is also changing with each passing day. The following editor summarizes many common aluminum alloy die-casting parts, casting parts and aluminum profiles. Complete surface treatment process of other aluminum products.

Metal materials are used more and more in various existing products, because metal materials can better reflect product quality and highlight brand value. Among many metal materials, aluminum parts are easy to process and has good visual effects. The surface treatment methods are abundant, and the first ones are adopted by various manufacturers. The surface treatment of aluminum profiles is mainly divided into: sandblasting (forming a matte pearl silver surface), polishing (forming a mirror surface), drawing (forming a satin-like effect), electroplating (covering a Layer of other metals), spraying (covering other non-metallic coatings)

The following volume cube metal editor will bring you some of our common aluminum alloy die casting surface processing technology.

1. Sandblasting (shot peening) of aluminum alloy die castings

The process of cleaning and roughening the metal surface by the impact of high-speed sand flow. The surface treatment of aluminum parts in this method can make the surface of the workpiece obtain a certain degree of cleanliness and different roughness, and improve the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece and increasing the gap between it and the coating. The adhesion force extends the durability of the coating film, and is also conducive to the leveling and decoration of the coating. This process is often seen in various products of Apple, and it is also increasingly adopted by existing TV cabinets or middle frames.

2. Polishing of aluminum alloy die castings

Using mechanical, chemical or electrochemical methods to reduce the surface roughness of the workpiece to obtain a bright and smooth surface. The polishing process is mainly divided into: mechanical polishing, chemical polishing, and electrolytic polishing. The aluminum parts are mechanically polished and electrolytically polished, which can be close to the mirror effect of stainless steel, giving people a sense of high-end simplicity and fashion in the future (of course, it is easy to leave fingerprints and more care).

3. Wire drawing of aluminum alloy die castings

Metal wire drawing is the manufacturing process of repeatedly scraping aluminum plates out of lines with sandpaper. Wire drawing can be divided into straight wire drawing, chaotic wire drawing, swirling wire drawing, and thread drawing. Metal processing WeChat, the content is good and worthy of attention. The metal wire drawing process can clearly show every minute wire mark, so that the metal matte shines with fine hair luster, and the product has both fashion and technological sense.

4. High-gloss cutting of aluminum alloy die castings

The diamond knife is reinforced on the high-speed rotating (generally 20,000 rpm) main shaft of the engraving machine with an engraving machine to cut the parts, and a local highlight area is generated on the surface of the product. The brightness of the cutting highlights is affected by the speed of the milling drill bit. The faster the drill speed, the brighter the cutting highlights, and vice versa, the darker and easier to produce knife marks.https://sandcasting.top Metal processing WeChat, the content is good and worthy of attention. High-gloss and high-gloss cutting are particularly used in mobile phones, such as iphone5. In recent years, some high-end TV metal frames have adopted high-gloss milling technology, coupled with anodizing and drawing processes, making the TV as a whole full of fashion and technological sharpness.

5. Anodizing of aluminum alloy die castings

Anodizing refers to the electrochemical oxidation of metals or alloys. Aluminum and its alloys form a layer of oxide film on aluminum products (anode) under the action of applied current under the corresponding electrolyte and specific process conditions. Anodizing can not only solve the defects of aluminum surface hardness, wear resistance, etc., but also extend the service life of aluminum and enhance its aesthetics. It has become an indispensable part of aluminum surface treatment and is currently the most widely used and very successful. Craft.

6. Two-color anodizing of aluminum alloy die castings

Two-color anodizing refers to anodizing on a product and giving different colors to a specific area. The two-color anodizing process is complicated and the cost is relatively high; but the contrast between the two colors can better reflect the high-end and unique appearance of the product.

7. Electrophoretic paint for aluminum alloy die castings

Electrophoresis is that the electrophoretic paint is applied to the anode and cathode, and the charged paint ions move to the cathode under the action of voltage, and interact with the alkaline substance generated on the cathode surface to form insoluble matter and deposit on the surface of the workpiece.https://sheetmetal.top/ It includes four processes: electrolysis-electrophoresis-electrodeposition-electroosmosis
8. Baking paint for aluminum alloy die castings

The purpose of the pre-treatment of baking varnish is to obtain a good coating, because the above stamping parts will have grease, oxide scale, dust, rust and corrosion on the surface during CNC manufacturing, processing, handling, and storage. If they are not removed, they will It directly affects the performance and appearance of the coating film, so the pretreatment occupies an extremely important position in the coating process.