The slurry used in the construction industry has important research value. According to the increasing uniformity requirement, the development status of slurry mixing technology has received more attention and analysis. Furthermore, the comparative study of different mixing structures based on dynamic simulation has been proposed and studied. Firstly, the characteristics of mixing structure is analyzed and the uniformity of slurry is characterized. Secondly, a threedimensional model of the simulation and analysis of the stirring blade is established. Then, the dynamic calculation and analysis are carried out based on the typical stirring process theory. Finally, the structural characteristics of different stirring blades is compared through actual simulation analysis, and the results could show which structure is optimal. The results prove that the bi-axial mixing structure has the characteristics of high stirring efficiency and low deposition degree, which can be suitable for the pulping process in the sealed environment.
Metal mirrors, represented by alμminiμm alloys, have soft and easily damaged surfaces and can be coated with a nickel- phosphorus alloy by means of chemical nickel plating prior to polishing. In order to obtain better processing results, the characteristics of the nickel-phosphorus alloy must be studied. In this paper, the nickel-phosphorus alloy was characterised by means of a hardness tester and EDS, and the experimental results show that the nickel-phosphorus coating has a Vickers hardness of 566 Hv. Depending on the properties of the coating, magnetorheological polishing was carried out using different types of polishing abrasive grains. By comparing the surface roughness after processing, silicon dioxide was selected as the polishing abrasive particle and magnetorheological fluid parameters such as pH value were adjusted to obtain a removal function with a volμme removal efficiency of 5.22 x 107μm3 /min. At the same time, combining different processes such as CCOS polishing and analysing the processing principle, the obtained surface roughness Ra value is better than 0.5nm, exploring the process route of nickel-phosphorus coating and providing technical support for the subsequent processing.
Due to Metal mirror’s low hardness, we coat a layer of nickel-phosphorus (NiP) layer on the surface and then polish NiP layer simpler through various methods. However, when using CeO2 slurry in Magnetorheological Finishing(MRF), the NiP layer will appear "wise-tail" phenomenon. Based on the "double-edged circle" model, we analyze the shear force of the contact surface and optimize the polishing abrasive particles such as SiO2. In this way, we could obtain a surface without "wise-tail" and the surface roughness reaches 1.897 nm in Ra. By orthogonal experiments, we optimize the process parametersts and certify the stability and linearity of the removal function.The experiment results prove that the MRF fluid compounded with SiO2 could satisfy the requirements of NiP layer in magnetorheological machining.
Lap-MRF, which is considered as a novel flexible finishing method, can produce smooth optical surface. In this paper, the influence mechanism of the optical surface roughness in Lap-MRF is analyzed. The effect of the processing parameters on the optical surface roughness after Lap-MRF is studied by orthogonal experiments. Based on the experimental results, the processing parameters of Lap-MRF are optimized to achieve optical surface with low RMS (Root-Mean-Square) value. At last, a K9 optical surface is finished under the optimal processing parameters and its optical surface roughness is improved to 0.459 n m RMS from 1.669 nm RMS. The results verify that Lap-MRF has great potential in finishing optical surface with high quality.
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