| The optics components are widely applied in the various engineering realm, while the traditional optically manufacturing method can’t satisfy the processing accuracy and the processing quantity requirements of optical parts, whatever in the producing efficiency aspect or in the stability aspect of the processing accuracy and the processing quantity, therefore studying a brand-new kind of high-efficiency and high-accuracy processing method of the optical components surface is of great significance.Magnetorheological finishing (MRF) is an advanced optical processing technology. In magnetorheological finishing, magnetically stiffened magnetorheological fluid flows through a preset converging gap that is formed between workpiece surface and moving rigid wall, to create precise material removal and polishing. Using MRF, the deterministic processing, the optical components can be finished with the help of computer in high accuracy, low surface roughness and high efficiency simultaneously The main content of the research in this thesis are as follows:1. The equipment of MRF was developed. Based on the theory of MRF and the principle of material cutting, the equipment’s overall arrangement and configuration was designed after the comparison with different kinds of lathes while research were mainly focused on the equipment which had been build on the VM-1360 CNC machine tool. Furthermore, the optimum way of. MRF was brought out based on the Preston Equation. According to the model of MRF cutting and the analysis of cutting function, the function of the dwell time was solved out. After practical trial, it was proven that the equipment is featured with great controllability, high efficiency and extraordinary precision.2. The magnetic circuit configuration was developed. The configuration of electromagnet was designed based on MRF device requirements; the model of magnetic field and magnetic circuit was established and optimized. Static magnetic circuit theory and scalar magnetic potential of magnetic circuit was analyzed to elicit the space distribution for magnetic field of electromagnet, and the magnetic circuit for MRF was simulated with the software of the finite element model. Accordingly, it was proved that the magnetic circuit could meet the adaptability and effectiveness of MRF.3. The liquid circulation system was developed in line with the magnetorheological finishing processing requirements. A circulation system outfit was created satisfying magnetorheological finishing functionally and practicably. A blending mixing device was eventually made. The style and shape of liquid storage vessel and mixing oar was determined. The power of motor, the size of mixing rotor was calculated derived from the value of mixing power. Based on the studying of effect of liquid viscosity, the model of viscosity control was developed and the working principal of control system was formulated. Under the adoption of computer, the viscosity control system can be well controlled by software. It is certain that this system can work steadily after serials of experients.4. The effect on magnetorheological finishing by several parameters was researched by experiments on the MRF machine tool. Those parameters include intensity of magnetic field, the finishing wheel rotation speed, the workpiece rotation speed and size of the gap between the optical parts and the finishing wheel. By applying orthogonal experiment, the influence regulations of various parameters were revealed ending up with the reasonable parameter options of MRF being identified. |
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