Applied Mechanics and Materials Vols. 633-634

Abstract: Studies have showed that the electrolyte vacuum boiling electroforming process can significantly improve surface quality and microstructures of the deposited layer. To explore the mechanisms that produce the above-mentioned favorable improvements, this paper focused on analyzing the change characteristics of cathode potential and interelectrode resistance carried out under different process conditions. Research results showed that, reducing vacuum degree or increasing cathode surface temperature result in an intense fluctuation in the cathode chronopotentiometry and interelectrode resistance; decreasing the vacuum degree causes the whole cathode chronopotentiometry to shift negatively, but situation is opposite when the cathode surface temperature rises.

Abstract: In conventional production of grain-oriented electrical steel, the content of silicon is limited to 3.0%~3.4%, which could control the ‘γ→α’ transformation process to obtain fine grain sizes in hot-rolling and disperse AlN particles in normalizing. In this study, the precipitation behaviors of S ans N in 4.5% Si-Fe alloy are inhibited during twin-roll strip casting process. And then the ideal microstructure and texture was obtained after the two-stage cold rolling and primary annealing. The evolution of microstructure and texture during the subsequent high temperature annealing were investigated. The results revealed that a sharp and developed Goss texture has been achieved by secondary recrystallization in the final annealing step and the magnetic induction B8 /Bsis above 1.76/1.90T.

Abstract: Piston forging process is a vital step in the manufacturing of automobile engines. According to the practical piston product in automobile engines, the three-dimensional geometric model of the piston forging is established, and the forging scheme of the aluminum alloy billet and the mold is formulated. Based on the rigid-visco-plastic principle, the finite element numerical simulation for the scheme of piston forging is implemented. The required load of forging equipment and the wear of the mold are obtained by the given temperatures, friction coefficients and forging speeds in their respectively feasible ranges. To facilitate the parametric analysis, simulation data are fitted in curves, which can provide reference for the piston forging and the mold designing in practice.

Abstract: In this study, Gamma TiAl intermetallic alloy protective coating was deposited on the surface of 5803 aluminum alloy by supersonic particles deposition. Researchers observed the surface morphology of the coating by SEM, and researched tribological properties of the substrate material and the coating by CETR friction and wear tester and Talysurf 5P-120 surface morphology tester. The results show that,the bonding mechanism of the Gamma TiAl intermetallic alloy coating and substrate is mechanical interlocking and metallurgical bonding. The abrasion mechanism of Gamma TiAl intermetallic alloy coating is abrasive Wear. The friction coefficients of the coating are all lower than 5083 alumium alloy. The friction volume of coatings reduced 36.7% than 5083 aluminum alloy with the friction loads 50N. TiAl coating has great function to anti-attrition and wearability.

Abstract: The BTA drill is one of the most widely used tool in deep holes drilling. The structural features of the BTA tool was analyzed, and the wear forms of the BTA cutting inserts was the focus of the study, and then propose a way to improve the BTA deep hole cutter abnormal wear. Through mass practices that improving abnormal wear of the drill can effectively improve the hole machining accuracy and surface quality and reduce processing costs.

Abstract: Based on the traditional direct electroless nickel methods, chemical baths are improved by removing HF. Examinations have been carried out on the Ni-P deposited on the interlayer for morphology, composition and corrosion-resistance by SEM, EDS, XRD and other instruments. A Ni-P film with fine and dense structure was obtained on the AM60B magnesium alloy. It exhibits lower corrosion current density and more positive corrosion potential than the substrate.

Abstract: The bending sheet metal inevitably exist bending errors including angle error, linearity error and length error of sideline for reasons that the structure of press brake, the manufacturing precision of press brake and mould and the inhomogeneous characteristics of processed sheet metal. The processing errors of sheet metal can affect the assemblage, increasing subsequent repair to the mold and forming calibration, extending the product development cycle, restricting the further promotion and application of bending forming, especially on the forming high strength and high spring-back sheet metal. The PBH110-3100 CNC press brake in Jiangsu Yawei Co.Ltd. is studied to increase the bending precision of press brake in this study. The bending errors in press break are analyzed in depth according to the elastic mechanics theory, and the rule that the manufacturing precision of press brake affect the press precision is educed. The analysis results have real significance on improving the press precision and reliability of press brakes.

Abstract: Low-pressure capacitively coupled plasmas are now widely used for plasma processing in the semiconductor technique. In this paper, a numerical simulation model was developed to simulate the plasma in a dual frequency capacitively coupled plasma reactor based on a two-dimensional, self-consistent fluid model. The aim of our work is to provide estimates of the main discharge and plasma parameters and to help understand the basic mechanisms governing the CCP etching devices. Accurate solutions of the continuity equations, electron energy balance equation and possion's equation with realistic boundary conditions are obtained. The numerical results are used to analyze the plasma density distribution for one and two dimensional on whole plasma reactor.

Abstract: Kind of self-insulation walls which combined silt sintered porous brick with reflective insulation coating to local conditions are introduced in this paper. It not only can reach the effect of composite insulation, but also can eliminate fire safety hidden danger of the self-insulation wall. Exterior wall of the summer and winter thermal performance were analyzed, Through its feasibility experiments and is worth a certain region to promote.

Abstract: In article work of a fragment of a wall design from blocks from autoclaved aerated concrete (AAC) is considered at its floor-by-floor leaning on monolithic overlapping of the building with a monolithic ferroconcrete framework and conditions of ensuring stability (not losses) a considered fragment within one floor at action on it the overturning moment from wind loading.