Precision finishing method of inner spherical surface of high-purity aluminum thin-wall part

The invention belongs to the processing technology of a precise component made from special material, and relates to a processing method of a high-purity aluminum precise element. In the invention, the high-purity aluminum thin-wall part is clamped on a spindle of a numerical control machine through a screw sleeve cap and quakeproof improvement so as to achieve the purposes of accurately positioning based on an end surface and simultaneously improving the radial force; reasonable tool structure parameters for cutting the high-purity aluminum material are obtained by early research so as to improve the previous tool; then a reasonable tool setting method is adopted so that the central point of the tool is precisely meshed with the center of a workpiece; and numerically-controlled turning processing is performed. Compared with the previous processing methods, the processing method of the high-purity aluminum precise part provided by the invention can be used for changing the condition that the high quality of surface of a part cannot be obtained before, and overcoming the problems of deformation, vibration, wave, built-up edge and the like in the processing, so that the inner spherical surface of the part reaches the level of a mirror bright surface and the requirements on light reflection are met; and moreover, the processing quality is stable, and the efficiency is high.