Aiming at the problem that the surface defects of the substrate, which are caused by the large size and uneven distribution of the polishing powder, the screening and classification of cerium oxide polishing powder was studied. The screening method of water dispersion was adopted. The impacts of the dispersion method, dispersion parameters, screening number, the concentration of polishing powder and settling time on the size and uniformity of the polishing powder were studied. The appropriate technological process and process parameters were determined by experimental study. The control over the granularity and uniformity of polishing powder was realized. Morphology of the polishing powders was studied by using SEM and granularity of powders was measured by laser granularity analyzer. The particle size of the polishing powder after screening is D (0.5) =1.6μm~1.8μm. The width of the particle size distribution is not over 3.3μm (D (0.9) ~D (0.1)). By the tests of white light interferometer, Ra of the ultra-smooth surface polished with the filtered cerium oxide is no higher than 0.3nm.
Laser gyro is the only one non-electromechanical high-precision inertial sensitive instruments in aircraft inertial guidance systems. Ultra high vacuum acquisition is a key segment during the manufacturing process of laser gyro. The surface cleanliness and integrity have decisive influence on the sealing performance of ultra-high vacuum. A cleaning technology for the optical surface of laser gyro cavity was found by experiment. Meanwhile, the analysis of the adsorption mechanism of contaminant on the laser gyro cavity surface and overview of common optical element cleaning technology were given. The result showed that the new cleaning technology improved the cleanliness of the cavity optical surface without any damage and provided a reliable solution for chronic leak of high precision laser gyro cavity.
With the development of the high speed cutting, the ultra-precision machining and ultrasonic vibration technique in processing hard and brittle material , the requirement of cutting tools is becoming higher and higher. As electroplated diamond tools have distinct advantages, such as high adaptability, high durability, long service life and good dimensional stability, the cutting tools are effective and extensive used in grinding hard and brittle materials. In this paper, the coating structure of electroplating diamond tool is described. The electroplating process flow is presented, and the influence of pretreatment on the machining quality is analyzed. Through the experimental research and summary, the reasonable formula of the electrolyte, the electroplating technologic parameters and the suitable sanding method were determined. Meanwhile, the drilling experiment on glass-ceramic shows that the electroplating process can effectively improve the cutting performance of diamond tools. It has laid a good foundation for further improving the quality and efficiency of the machining of hard and brittle materials.
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