Filling process of micro prism array by isothermal hot embossing in solid-like state (IHESS) with different mold temperature, pressure, and holding time were simulated by DEFORM. Polymethyl methacrylate (PMMA) samples processing by IHESS were tested to validate the numerical simulation results and select the best processing condition. The reliability of simulation was tested quantitatively and qualitatively by comparing the cross-profile and its developing trend separately. It was found that the cross-profiles from the simulations and experiments were in high agreement. The simulated and experimental developing trends of cross-profiles were also the same.These results proved the reliability of simulation and its guidance to the experiments.In order to show the advantages of IHESS, a brief introduction and comparison of IHESS and traditional hot embossing were made.
K E Y W O R D Smicrostructure, nanotechnology, processing, simulations
TiC/Ti5Si3composite materials on Ti-5Al-2.5Sn were in-situ synthesized by argon tungsten-arc welding (GTAW) deposition from powder compacts with the molar ratio of Ti:Si:C=3:1:2. X-ray diffraction (XRD) techniques and scanning electron microscope (SEM) were employed to characterize the microstructure of the composites. The effects of depositing times on the surface microstructure of the tracks deposited were studied. From the products synthesized in this work, the content of TiC/Ti5Si3in-situ composites on the surface of the tracks differed from each other by depositing one, two, three, and four times, respectively. The minimum impurities were obtained and the distribution of TiC/Ti5Si3. In-situ composites were most homogeneous in the track surface by depositing three times.
The wire was made by Tungsten Carbide(WC) particles as core. MIG welding was used to surface iron-based WC wearable composite coating of different size and content of WC particles on mild steel. Microstructure was investigated. Surface rigidity and wear resistance were tested. The results indicate that the small particles are dissolved seriously, which separate out with reticulation. The hardness and wear resistance of the matrix are relative higher. The big particles are dissolved less, tree crystal separates out along particles. The particles are easy to fall off when wearing. So the hardness and wear resistance of the substrate are relative lower. The admixture with 80% big particles and 20% small particles has the best wear resistance, its wear resistance can achieve quintupling of quenching 45 steel. The hardness and wear resistance increase with content of WC increasing.
Welding power source is an important research content in the field of welding technology. It is of significance to organize the design database of welding power source, construct its development platform, and realize its CAD and simulation system based on Web. In the scope of this paper, the core technology applied in above aspects were analyzed and summarized, the current development status and future trend of the application of computer and internet technology in welding power source areas were introduced.
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