The invention discloses a
grinding and
polishing process for repair of an aluminum
alloy hub. The process includes the steps of S1, trimming and reshaping; S2, rough
grinding; S3, packing; S4, accurate
grinding; and S5,
polishing. In the step S1, a scratched part of the hub or a protrusion at a
welding repair part is trimmed to form a required model by an aluminum file or a grinding head; in the step S2, dry
abrasive paper from number 80 to number 400 is successively selected to
grind and trim the surface preliminarily; in the step S3, whether pores and pits exist in the ground surface is examined, and unsaturated resin
putty or aluminum
putty is used for filling the pores and the pits; in the step S4, for the trimmed surface with a curved surface examined to be qualified, waterproof
abrasive paper from number 400 to number 800 is selected for modifying grinding in a skipping mode; and in the step S5, on the basis of accurate grinding, waterproof
abrasive paper from number 1200 to number 2000 is further selected for grinding layer by layer in the order from thick to thin until scratches and grinding traces of the abrasive paper of the upper layer cannot be seen, and finally a
polishing agent and a polishing wheel are used for polishing operation until the mirror surface effect is formed. According to the process, polishing treatment is carried out for repairing the aluminum
alloy hub after rough grinding and accurate grinding, and therefore the surface of the aluminum
alloy hub can have the mirror surface effect, and the repair effect is good.