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Surface polishing of aluminum castings is a key process, which aims to enhance the appearance quality of the castings, extend their service life, and meet the requirements of specific application scenarios. Polishing requirements usually involve the following aspects:

Surface roughness is the core requirement for polishing aluminum castings. By using different polishing methods and tools, the roughness of the casting surface can be effectively reduced, achieving a microscopic flatness of Ra0.8 to Ra3.2. This not only helps to reduce friction and wear, but also enhances the surface gloss.

Surface quality is also an important indicator that needs to be paid attention to during the polishing process. The surface of aluminum castings should be free of obvious defects such as sand holes, gas holes and cracks to ensure their overall aesthetic appeal and structural stability.

During the polishing process, it is also necessary to pay attention to the protection of aluminum castings. Avoid excessive polishing to prevent surface damage, and at the same time, prevent the polishing medium from remaining on the surface of the casting to avoid affecting its subsequent performance.

The polished aluminum castings should undergo quality inspection. Through visual inspection, tactile inspection and possible instrument testing, ensure that the polishing effect meets the requirements.

In conclusion, the surface polishing requirements for aluminum castings cover multiple aspects such as surface roughness, surface quality, protective measures, and quality inspection. Only by meeting these requirements can we ensure that aluminum castings have good appearance quality and performance in use.