Papers by Author: Dan Lu Song

Abstract: Taking the column of the wheel groove milling machine as the research object, the randomness of the structure design parameter is simulated with the PDS of the ANSYS procedure, by taking the column height, load and elastic modulus as input random variables. The reliability analysis for the column deformation has been done with the Monte Carlo method. The results showed that the column reliability is 100% under the sample for 1000 times, and the number of simulation meets accuracy requirements. The evaluation of the probabilistic sensitivities showed that: the elastic modulus is the most important factor affecting the column reliability, and the reliability of column can be improved by decreasing the dispersion of the property parameters of the material.

Abstract: The reliability data of nuclear power CNC wheel groove milling machine is so few that the reliability can not be predicted by traditional reliability prediction method;or the reliability prediction error is large. A reliability prediction method of nuclear power CNC wheel groove milling machine based on the gray theory is proposed in this paper. Establishing the reliability model of gray theory, the reliability of machine subsystem is determined. Then the relationship between the corresponding average fault-free time and system reliability is realized. The gray comprehensive correlation between theoretical output of the model and the actual system reliability is established, the overall reliability of the nuclear power CNC wheel groove milling machine is determined. For system reliability analysis and system maintenance decision research puts forward a new thinking path, have a good applied foreground. Key words: the nuclear power CNC wheel groove milling machine; gray theory; average fault-free time; system reliability; reliability analysis.

Abstract: This paper describes works of the post-mixed abrasive water jet, and makes kinetic energy analysis to the single abrasive particles from the theory angle, In addition, does some research such as Jet pressure, abrasive flow, the speed of nozzle movement and Incident angle on the influence of the removal rate.Through the control of technological parameters, the paper studies polishing removal mechanism of single abrasive particles for stainless steel on the grades of 0Cr18Ni9Si,Thus which provides theoretical basis and practical guidance for the cold polishing processing of profile surface.

Abstract: In this paper, it introduces the work principle of abrasive waterjet polishing (AWJP) and analyzes the jet distance to the influence of the AWJP under a certain pressure, with a numerical simulation and analysis to the jet distance based on jet mechanics and fluid dynamics. By establishing the physical models of the different jet distance of the AWJP and adopting the Realizable k-ε model and the SIMPLEC algorithm, it gains the jet flow field of the AWJP with different jet distance models and the distribution of turbulence intensity and pressure and velocity on the workpiece surface. The numerical simulation results of the different jet distance were analyzed and compared, according to the AWJP to the characteristic requirement of the jet. By doing the polishing experiment with a abrasive waterjet cutting machine, it verifies that the best polishing distance range of AWJP is from 10 times to 13 times of the nozzle diameter, which provides the theoretical basis for the process research of the AWPJ in the future.

Abstract: For the weaknesses in the precision machining to leaves, the overall structure model of TX-6 CNC abrasive belt grinding machine was established by the soft of Inventor, and the grinding trajectory was planned. The finite element model, static stiffness and modal analysis of the machine were established. The design of TX-6 CNC abrasive belt grinding machine have been approved.

Abstract: Electroless plating technology used to alleviate fretting damage of titanium alloy was studied, Ni-Tl-B coatings were prepared, process optimization was worked out by the orthogonal table, deposition rate and solution consumption per hour and the initial friction coefficient and the bearing cycles under a low friction coefficient were chose as the index to calculate the range according to the economical efficiency and the application of coating under the surface morphology analysis and the fretting friction coefficient test, optimum process was finally worked out. Surface morphology was analyzed by TM-1000 scanning electron microscope and the fretting friction coefficient was tested by the DELTALAB-NENE fretting wear tester. The results shows that the surface morphology of the Ni-Tl-B coating are all typical cell structure which will be slightly different when the process changes and the optimum Ni-Tl-B coating has outstanding fretting damage resistance.

Abstract: Both of coating with lead nitrate as stabilizer (common Ni-B coating) and coating with thallium sulfate as stabilizer (Ni-Tl-B coating) were prepared on steel substrates. Meanwhile, different Ni-Tl-B coatings were also prepared by changing the content of thallium salt in solution. Several kinds of process of electroless plating Ni-B were introduced. Surface morphology was observed with TM-1000 scanning electron microscope, and the alleviating fretting damage property was tested on DELTALAB-NENE high-precision hydraulic servo fretting wear tester. The results show that: The more content of thallium salt, the rougher the surface morphology of coatings is. When the content of thallium salt in plating solution is 2mg/L, the coating has the best alleviating fretting damage property with the coefficient of friction 0.12 in running-in stage.

Abstract: Based on introducing Laser-induced Chemical Liquid Deposition (LCLD) technology, this paper gave a new type of RP system graph based on the technology, and it has introduced the work process of this system on detail. The process of LCLD is controlled by thermal transfer if the heights of liquid and metallic material are changeless. Modeling thermodynamics of the part of facular laser beam of the process of LCLD, calculating and emulating by engineering analytical software, these researches can lead to the conclusion that the highest temperature of plating liquid can be found if the diameter of the facular laser beam is unchangeable. The relation between temperature and power of laser is linear on the whole. The locomotory speed of the laser beam does little influence on temperature of plating liquid; the thermal area of plating liquid influenced by laser is very small; the temperature in the thermal area is asymmetrical. The width of metal line of the deposition can be controlled at a certain extent by controlling the initial temperature of plating liquid and power of laser.