In order to improve the fatigue life of axial piston motor, piston holes were strengthened by inner rolling strengthening process after precision machining. Based on the principle of surface rolling, finite element simulation models of inner rolling and fatigue were established to research mechanism of residual stress and fatigue cycle, respectively. We analyzed the distribution characteristics of residual stress in hole wall and studied the influence law of different rolling process parameters on residual stress. The fatigue life of workpiece with and without residual compressive stress was compared stress life simulation. The results show that the maximum residual compressive stress of 150~210 MPa can be generated after rolling strengthening. The fatigue life was increased by about 21.4% due to residual compressive stress.
KEYWORDS: Signal detection, Complex systems, Error analysis, Control systems, Adaptive control, Oscillators, Interference (communication), Signal to noise ratio, Vibration control, Scientific research
In this paper, an adaptive frequency detection method based on frequency difference control is proposed. By controlling the frequency difference between the frequency of the signal to be checked and the frequency of the periodic policy, the adaptive selection between two kinds of chaotic vibrators is realized, thus the detection speed is accelerated, the detection accuracy is high, and the error is small. At the same time, the stability of adaptive frequency detection method based on frequency difference control is analyzed, and the simulation results show that the detection method has good stability.
Surface of fused silica optical components were polished by Ion Beam Figuring (IBF) ultra-precision process. Based on the analysis of the relationship between the ion beam current density distribution parameters obtained by faraday scan and the removal function, the removal function model for IBF was established. The IBF experiment for fused silica optical materials were carried out. The experimental results show that the IBF method based on faraday scan can achieve the same figure correcting ability as the traditional IBF method based on line scan experiment. But the offline calculation time of the removal function can be reduced from 2 hours to 5minutes, which improves the efficiency of IBF greatly. After several cycles the initial surface figure error of the optical element before processing, with a PV value from more than 500 nm to less than 15nm and an RMS value from more than 120nm to less than 1.5 nm. Ultra-precision surface of fused silica optical components with nanometer scale were obtained by IBF.
In order to solve the problems of no uniform coating, edge coating, and severe coating defects in the process when processing 430mm×430mm optical components, The basic requirements of surface roughness data acquisition are analyzed and the application of inductive sensor in surface roughness is introduced. Optical element flattening layer coating and flow direction mechanisms, flattening layer material selection, and research on material characteristics and optical element planarization layer deposition process, achieving uniform coating of optical elements, reducing coating defects, and meeting the requirements of the next process polishing
PS plate (presensitized plate) is a new type of plate used in the fast printing industry. Due to the "squeaking" caused the production process, it will seriously affect the printing quality. This kind of helium detection device is currently entirely monopolized by large foreign companies, the price is expensive, and it is also not suitable for the conditions of domestic enterprises. The development of this device will fill the gap in the domestic field. At present, most domestic companies adopt manual inspection methods for naked eye observation. Because of the subjective nature of human beings, it is impossible to quantitatively analyze. The PS version quality report provided by the device development provides data basis for later-stage sheet and stacking work which can realize Intelligent production.
It is a critical technology to improve the optical film uniformity during the film deposition process. The ion beam sputtering and polishing system was used to prepare the film on the surface of large-aperture optical elements. A calculation method for controlling the dwell time ratio I of the ion beam working at the center and edge of optical component was proposed. The dwell time ratio I was calculated by the film thickness data obtained from the center and edge, and the dwell time ratio I was revised step by step. Then it was input in the program as one of the sputtering process parameters. The experimental results show that, when I was revised to -26.6%, uniform film can be achieved on optical elements with a diameter of 300mm-600mm. Taking a Si film on the surface of fused silica as an example, the experiment was carried out for 6 hours. The film thickness is about 212 nm, and the film uniformity could reach up to 0.42%, which meets film thickness uniformity requirements by ion beam sputtering deposition method.
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