Mirror finishing method for hard anodized surface of aluminum alloy

The invention discloses a mirror finishing method for a hard anodized surface of an aluminum alloy, and belongs to the technical field of machining. The method comprises the steps that firstly, polishing is conducted, so that the surface roughness of the aluminum alloy piston rod before hard anodizing meets Ra0.2; carrying out hard anodizing on the surface of the piston rod; then conducting rough polishing, semi-finish polishing, finish polishing and ultra-finish polishing in sequence by changing parameters such as polishing paper, the rotating speed of a lathe spindle, the linear speed of an outer circle of a workpiece and the feed amount; and finally, measuring to enable the surface roughness of the piston rod to meet Ra0.1. 一种铝合金硬质阳极化表面的镜面加工方法，属于机械加工技术领域。首先抛光使硬质阳极化前的铝合金活塞杆表面粗糙度满足Ra0.2；然后进行活塞杆表面硬质阳极化；之后通过改变抛光纸、车床主轴转速、工件外圆线速度、走刀量等参数依次进行粗抛光、半精抛光、精抛光、超精抛光；最后测量使得活塞杆表面粗糙度达满足Ra0.1。