Structure Design And Similation Analysis Of Key Components Of Aspheric Polishing Machine

The aspheric optical components have growing demand in the aerospace, national defense, optoelectronics, microelectronics, medical devices and other products for civilian and military fields. Due to the aspheric optical components with very complex geometrical properties,the existing methods and equipments are difficult to meet the requirements of its form accuracy and surface quality, Therefore it is of very important significance to research Aspheric polishing machine.A new polishing processing method of rotate-swing linkage is proposed for the complex optical surfaces. The workpiece is clamped on the rotating table, and the normal direction of the workpiece at a certain angle with the direction of polishing tool spindle by controlling the angle of precision swing table. According to this method, the key components structure of polishing machine tool is designed, and the overall assembly is designed at last.In order to ensure the precision of precision machining, first of all, the bearing characteristics of air-bearing rotary stage is analyzed. Exerting the maximum bearing force on air-bearing rotary stage, the obtained maximum deformation is far less than technical requirements of ultra-precision machine tool. That is to say, the stiffness of air-bearing rotary stage can completely guarantee the accuracy requirements of precision machining. Then static analysis is applied on precision swing table and machine tool beam, and structure of weak link is optimized. The optimized precision swing table and machine tool beam can meet the accuracy requirements of precision machining. Finally, modal analysis is applied on the precision air-spindle and machine body. The calculated natural frequency is much larger than the maximum frequency in the process of polishing, and it means that the structure does not cause resonance. In other words, the designed structure is reasonable.According to multi-body dynamics theory, rigid-flexible coupling dynamics simulation is applied on the rotate-swing linkage device by utilizing LMS Virtual.Lab Motion software. First of all, constraint condition is set, and then the swing part of rotate-swing interlocks is meshed to achieve flexibility. At last flexible body is guiding into the rotate-swing linkage model to calculate. Finally, we get the X, Y and Z-directional displacement curve of rotating part of rotate-swing device, and there is not phenomenon of vibration in three directions. That is to say, the designed rotate-swing linkage device meets completely the requirements of precision polishing process.