In this paper, from two aspects of abrasion of grinding disk and stability of removal function, this paper compares the machining methods of planet movement and smooth running. On the basis of the Preston hypothesis, based on the kinematics theory, the grinding disk theory wear model of planet movement and smooth running is established, and the three-dimensional model of grinding disk wear under two kinds of motion is simulated by MATLAB. The correctness of the theoretical wear model and three-dimensional simulation wear distribution model of the grinding disk is verified by experiments. The experiment found that the wear of the grinding disc under smooth running tends to be uniform, and the wear of the grinding disc under the planet movement increases along the direction of the radius increasing. It is assumed that with the continuous abrasion of the grinding disk, the degree of fit between the grinding plate and the workpiece surface becomes worse, and the removal quantity of workpiece material is affected, which will affect the stability of the removal function. Through the removal function experiment of an hour, we find that the stability of the volume removal rate of the removal function fluctuates within 7% and the stability of the peak removal rate fluctuates within 6% under the smooth running, while the stability of the volume removal rate of the removal function fluctuates within 29% and the stability of the peak removal rate fluctuates within 12.3% under the planet movement. The results show that the wear of the smooth running is uniform and the removal function is stable. Therefore, the smooth running is more suitable for high-precision modification than planet movement.
With the increase of the diameter of the silicon carbide (SiC) mirror, the amount of material removed increases dramatically. The SiC material has the characteristics of high hardness and chemical stability, so the higher requirement of the convergence efficiency is put forward. The current SiC mirror processing is carried out through a series of different processes or parameters. The combined processing converge the surface residual error. But this method relies on the experience of personnel experience to determine the transfer conditions of process sequencing. This paper research on improve the convergence efficiency at the same time ensuring the accuracy of processing. The quantified evaluation function is put forward to help estimating the transfer conditions of process sequencing. On this basis, the multi-process combination calculation is carried out. The dwell time of multiple remove functions is solved at the same time in the optimization process. The combination of large and small removal function is optimized. Combined with the simulation calculation, the optimized process of large diameter silicon carbide mirror is given.
Computer Controlled Optical Surfacing (CCOS) is an important technology for manufacturing optical aspheric mirrors. Edge effect of small tool manufacturing restricts the machining precision and efficiency of CCOS technology. Edge effect is mainly caused by the polish tool cannot move to the very edge of workpiece and the change of pressure distribution when the tool move to the edge of workpiece. This article corrects the rolled edge effect of CCOS by different dimensions of polishing tool combination process and incorporated with the locality residual error trace contour path planning. Provide feasibility for the rolled edge by different dimensions of polishing tool combination process.
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