Experimental Research On Flexible Polishing By Compound Diamond Powder

As a final surface treatment technique, polishing plays an important role in the precision/ultra-precision process, especially in the optical industry and precision machine field, which has a significant impact on the final quality of products directly. However, it is hard to polish complex surface by using traditional polishing and it will lead to some defects, such as work hardening, etc. In order to solve the above problems, a new polishing method—flexible diamond powder jet polishing(FDPJP) was proposed in this dissertation.During the process of FDPJP, the polishing abrasive grains are made of a kind of compound particle by utilizing small flexible rubber base to fix and support diamond powder. The abrasive grains are jet onto the workpiece at a specific speed and an incident angle, the micro irregularities on the workpiece surface are cut during the scratching, rolling and plowing of the grains. In this way, the surface roughness of the workpiece can be improved.During the process of FDPJP, the impact of the accelerated diamond abrasive powder on the workpiece is alleviated by the soft rubber matrix because most shock energy is absorbed, and the gentle cutting force of the compound grains can bring in little residual stress on the workpiece. These characteristics of the FDPJP help to moderate the direct impact of diamond abrasive during polishing, so as to prevent workpiece surface from work hardening, superficial embedment of abrasive grains, and excessive scratches.Based on the above principles, an experimental platform of flexible diamond powder jet polishing was set up. Experiments of different jet pressure and incident angle were carried out to confirm the impact of this process on the glass surface roughness. The experimental results show that FPCDP method can effectively reduce the affected zone of crack depth and improve the process quality of the glass surface compared with the traditional AJM method during the glass polishing process.In addition, FEM modeling and simulation were performed to reveal the jetting process and the mechanism of the flexible polishing process. In conclusion, the experimental results confirmed that the FDPJP can polish complex surfaces at a high precision at low cost, which indicates a great prospect in the development and application of the FDPJP.