研究目的
To propose a method that applies an elastic spherical tool to polish the surface of the Wolter-I mandrel, aiming to reduce the surface roughness of the mandrel coated with chemically deposited nickel-phosphorous (NiP) alloy after diamond turning effectively.
研究成果
The proposed polishing method effectively reduces the surface roughness of the Wolter-I mandrel after diamond turning, with the RMS roughness reduced to 1.56 nm. The method improves the manufacturing precision and efficiency of the Wolter-I mandrels and reduces the manufacturing cost.
研究不足
The method requires precise control of the contact force and dwell time at each polishing point, which may complicate the polishing process. Additionally, the method's effectiveness is dependent on the initial surface roughness after diamond turning.
1：Experimental Design and Method Selection:
The method involves using an elastic spherical polishing tool to perform precise polishing of Wolter-I mandrels. The shape of the elastic sphere can be changed relatively easily to accommodate the aspherical surface of the Wolter-I mandrel. A mathematical model regarding the movement trace of the polishing tool was established to control the contact force between the polishing sphere and the aspherical surface.
2：Sample Selection and Data Sources:
The surface of the mandrel used during the polishing experiment was a Wolter-I structure formed by the combination of a hyperboloid and an ellipsoid.
3：List of Experimental Equipment and Materials:
The experiment utilized a spherical polishing tool with a polishing cloth attached to its surface and a polishing solution containing 0.5 μm particles. The mandrel was rotated at a speed of n = 1500 rpm.
4：5 μm particles. The mandrel was rotated at a speed of n = 1500 rpm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The movement trace of the spherical center of the polishing sphere was calculated, and the dwell time t of each polishing point was determined. The numerical control program was compiled to control the movement trace of the spherical polishing tool and the dwell time t at the polishing point.
5：Data Analysis Methods:
The impact of polishing parameters on the material removal thicknesses was simulated and analyzed. The surface roughness of the mandrel after polishing was detected by atomic force microscope (AFM).
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