Jan 20, 2020 Viewed: 253 Tag: aluminum extrusion  

The difference between aluminum die casting and aluminum extrusion

Aluminum profiles such as screens and windows are common. It uses an extrusion molding process, that is, after melting raw materials such as aluminum ingots in a furnace, it is extruded through a extruder to a mold to flow out. It can also extrude various profiles with different cross sections. The main performances are strength, hardness and abrasion resistance according to national standard GB6063. The advantages are: light weight of only 2.8, no rust, fast design changes, low mold investment, and longitudinal elongation of up to 10 meters or more.

The appearance of aluminum profile is divided into bright and matte. Its treatment process adopts anodizing treatment, and the surface treatment oxide film reaches a thickness of 0.12m / m. The thickness of the aluminum profile is selected according to the product design optimization. It is not as thick as possible on the market. It should be designed according to the requirements of the cross-section structure. It can be uneven from 0.5 to 5 mm. The layman thinks that thicker and tougher is actually wrong. The surface quality of aluminum profiles also has disadvantages that are difficult to overcome: warping, deformation, black lines, embossing and white lines.

Those with high designer level and reasonable mold design and production technology can avoid the above-mentioned defects. The inspection of defects should be carried out according to the inspection methods prescribed by the state, that is, the sight distance is 40 ~ 50CM to judge the defects. Aluminum profiles are widely used in furniture: screen skeletons, various hanging beams, table legs, decorative strips, handles, cable trunking and covers, chair tubes, etc., which can be designed and used in ever-changing ways!

Although there are many advantages of aluminum profiles, there are also unsatisfactory places: Aluminum materials that have not been oxidized are easy to "rust", which leads to performance degradation. The longitudinal strength is not as good as that of iron products. The wear resistance of surface oxide layer is not as good as electroplating. The layer is easy to scratch. The cost is higher, and the cost of iron products is about 3 ~ 4 times higher.

2.1 Compared with the processing methods of die-casting alloys and profiles, the equipment used is different. Its raw materials are aluminum ingots (about 92% purity) and alloy materials, which are melted by the melting furnace and then molded into the die-casting machine. The shape of the die-cast aluminum product can be designed like a toy, with different shapes to facilitate connection in various directions. In addition, it has high hardness and strength, and can be mixed with zinc to form a zinc-aluminum alloy. Die-casting aluminum forming process points:

1. Die-casting

2. Rough polishing to remove mold residue

3. Fine polishing On the other hand, the production process of die-casting aluminum requires molds, which are very expensive and higher than other molds such as injection molds.

At the same time, mold repair is very difficult, and it is difficult to reduce material repair when designing errors. Disadvantages of die-casting aluminum: Each production process should have a large quantity to reduce the cost. Polishing is more complicated and the production cycle is slow. The cost of the product is about 3 to 4 times higher than that of the injection molded part. The screw hole should be a little larger (4.5mm in diameter) for the connection force to be stable. Scope of application: table legs, desk connectors, decorative heads, aluminum seals, countertops and coffee table tops, etc., the range is very wide.

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