时变去除函数在气压砂轮抛光中的应用研究

针对气压砂轮抛光中通过驻留时间控制材料去除量需在模具表面多去除一层材料及抛光效率低等问题,提出了一种基于时变去除函数的抛光材料去除量控制方法。该方法以抛光工具所能达到的最大进给速度在模具表面进行抛光加工,无需多去除材料,通过实时改变抛光工具的去除能力以适应面形误差的变化,极大地缩短了抛光时间;开展了抛光材料去除过程研究,建立了气压砂轮抛光工具进给速度与面形数据和抛光去除函数之间的关系,提出了抛光过程时间的计算方法;针对时变去除能力超出抛光工具最大去除能力的问题,提出了在气压砂轮抛光中对需去除的材料进行分层抛光的思想。最后,通过抛光过程时间对材料去除量控制的两种方法进行了对比分析。研究结果表明,在气压砂轮抛光中采用时变去除函数来控制材料去除量能极大地提高抛光效率。

Utilization of time-variant influence functions in pneumatic wheel precession polishing

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 workpieee 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.