JI Shi-ming，JIANG Xin-xin，JIN Ming-sheng，ZHANG Li

（Key Laboratory of E&M，Ministry of Education & Zhejiang Province，Zhejiang University of Technology，

Hangzhou 310014，China）

Abstract：In order to solve the problem of the removal of an additional layer of material（uniform removal），across the workpiece surface in the application of the dwell time method in the pneumatic wheel precession polishing，a new approach considering time- variant influence functions was introduced to control the amount of materials polished to reduce the process time. Utilization of time-variant influence functions provides the basis that a polishing tool may move with a constant maximum velocity across the workpiece surface without additional uniform removal. The surface error profile was removed by changing the polishing tool removal characteristics during polishing process. After the analysis of the material removal process，the relationship between the velocity of the polishing tool and polishing removal function and surface error profile were established，and a calculating method of processing time was provided. When the polishing tool removal characteristic exceeds the value achievable in the pneumatic wheel precession polishing，the workpiece surface was polished layer by layer in a polishing process. The results indicate that the polishing efficiency can be greatly improved by the utilization of time-variant influence functions in the pneumatic wheel precession polishing process.

Key words：pneumatic wheel；dwell time；time-variant influence functions；layer by layer polishing