Abstract: A theoretical model of temperature for Al2O3 ceramics during micro-detonation of arc strike machining was established. Based on finite element theory, the temperature of Al2O3 ceramics during micro-detonation of arc strike machining was simulated with the aid of Ansys software, combined with the actual processing, the width and depth of cavity impacted by micro-detonation were calculated. The simulation results show that the highest temperature of Al2O3 ceramics is over 13435 °C in a given processing parameters, while the high-temperature zone is quite small. With the increase of pulse width and electricity, the temperature within the machined zone increases rapidly, but the outside area kept a low temperature; and with the increase of nozzle radius, the diameter to depth ratio of the distribution of temperature is increasing gradually. The data gained from the simulation is proved to be accordant with the data gained from experiments.
Abstract: Surface roughness is one of the key factors to evaluate the grinding quality for engineering ceramics. This study introduces a new method based on grayscale information of surface images, to assess and predict the roughness of ground ceramics rapidly and effectively. The investigation sets the functional parameters of digital acquisition device as Brightness 140, Contrast 42, Saturation 24 and Acutance 9. Afterwards, it selects the mean value and the mean square deviation to describe surface roughness, and some image processing techniques are adopted to reduce noises and enhance the images. Lastly, it gives the relation curves on Ra，Rz，Ry versus grayscale information, and concludes a direct proportion law between the grayscale information and ground surface roughness.
Abstract: Based on the function of Chooks in MasterCAM, the section of a oval gear is generated. An oval gear 3D Model is established using the section in UG, then a pair of assembling oval gear in UG is imported into ADAMS, motion simulation results are validated and compared with the theoretical value. The results indicate that the profile conversion method can meet the design requirements in certain conditions of transmission accuracy, and effect of eccentricity to the transmission of oval gears is summarized.
Abstract: Research and exploration on the mechanism of improving anti-erosion in artillery barrel life have been done to enhance anti-ablation property of barrel, which combined with the characteristics that the surface modification coating should have and used electrical explosion spraying technology (EEST) advantage. Preliminary conclusions have been drawn according to tests Results. Coating prepared by using EEST has significantly better in anti-erosion performance than coating prepared by using chrome coating.
Abstract: In a highly competitive economic society, in order to survive and maintain competitiveness, enterprises must constantly seek beneficial investment opportunities to keep a leading position in competition. The development of new products is the most difficult task in such a process. With solar module industry as the theme, this study explored the new product development decision-making issue and summarized five major key dimensions and 19 their subordinate criteria regarding new product development by literature review and expert interview. It employed the Interpretive Structural Model (ISM) to obtain the dimension-dimension and criterion-criterion dependence relationship, and used the Fuzzy Failure Mode and Effect Analysis (Fuzzy FMEA) to determine the top priority factor for assessment improvement in the new product development solutions of the enterprises.
Abstract: The main advantage of the flexible manufacturing system is its high flexibility in management of production facilities and resources (time, machines and their utilization, etc.). The largest application of these systems is in the area of small batch production where its efficiency is getting near to the mass production efficiency. Its disadvantage is the high implementation price.
Abstract: In this paper, we investigated the effect ofthetemperatureand the initial concentration of sodium bromateon the soluble-insoluble self-oscillation of a nonthermoresponsiveself-oscillatingpolymer chain. The polymer chain consisted of Acrylamide (AM) main-chain covalently bonded to Ru (bpy)3as a catalyst of the Belousov-Zhabotinsky (BZ) reaction. The amplitude of the transmittance self-oscillation is hardly affected by the concentration of sodium bromate and the temperature.
Abstract: In this paper, theeffect of the initial concentrationof nitric acidon the soluble-insoluble self-oscillation for a novel polymer chainwith nonthermoresponsive nature was investigated. The self-oscillationoccurs induced by the Belousov-Zhabotinsky (BZ) reaction. In the condition of [HNO3] = 0.1 M, no transmittance self-oscillation occurs. In addition, in thecondition of [HNO3] = 0.2 M, the life-time of the self-oscillation is significantly short. This is because the solution pH much affects the BZ reaction. Moreover, we demonstrated that the period of the transmittance self-oscillation decreases with the increase in the temperaturein accordance with the Arrenius equation.
Abstract: In this paper, we investigated the influence of the temperatureand the initial concentrations of malonic acid on the transmittance self-oscillation for a novel nonthermoresponsivepolymer chain. The amplitude of the self-oscillation hardly changes while change in the temperature and the concentration of malonic acid. The period of the self-oscillation does not decrease with increase in the concentration of malonic acid at 14, 16 and 18 °C.