Brief analysis of casting function and polishing technology of aluminum die casting
/ Industry News
/ Brief analysis of casting function and polishing technology of aluminum die casting
Aluminum die-casting can effectively have its outstanding casting function. Because of its low melting point, it can be widely used in metal casting and pressure casting to improve the connotation quality, dimensional accuracy and appearance of castings. And production power.
When aluminum die-casting is operated, because of its large latent heat of condensation, under the same conditions of operation, the condensation process of aluminum liquid is continuously much longer than cast steel and cast iron, and the flowability is excellent, which is beneficial to casting thin wall and The messy castings are laid out.
Aluminum die-casting requires an alkaline polishing solution system during operation. To some extent, the effects of corrosion inhibitors and viscosity agents on the polishing effect are compared. To some extent, an alkaline solution system with a good polishing effect is successfully obtained. For the first time, an additive that lowers the operating temperature, extends the life of the solution, and at the same time improves the polishing effect is obtained.
The effective addition of the appropriate additives to the aluminum die-casting solution can produce a good polishing effect. After the solution is subjected to DC constant-voltage electropolishing under certain conditions during the operation, the surface reflectance of the aluminum material can reach 90%. The feasibility of using DC pulse electropolishing method to polish aluminum under alkaline conditions was explored. The results show that the pulse electropolishing method can achieve the leveling effect of DC constant pressure electropolishing, but its flattening speed is slow.
Aluminum die-casting has determined the development of a new environmentally friendly chemical polishing technology based on phosphoric acid monosulfate, which aims to achieve zero emissions of NOx and overcome the quality defects of similar technologies in the past. The key to the new technology is to add some special-effect compounds to the base fluid instead of nitric acid. To this end, it is first necessary to analyze the chemical polishing process of aluminum triacid, especially to study the role of nitric acid.
Aluminum die-casting has the advantage that other castings cannot be compared in the process of operation. In the process of operation, especially since the automobile is lightweight, aluminum die-casting has been widely used in the car industry. Cast aluminum alloys have a lower density than cast iron and cast steel, but have a higher specific strength. Therefore, the selection of aluminum alloy castings under the same load conditions can reduce the weight of the layout, so aluminum alloy castings are widely used in the production of aviation industry and power machinery and transportation machinery.