Advanced Materials Research Vol. 548

Abstract: There were described about the basic theory and methods, main content, and functional characteristics of the performance analysis of three-cone drill bit. From the several key areas in drill bit design, the objectives and approaches of optimization are analyzed, and its impact on design quality of drill is also discussed. Based on the geometry and kinematics theories of cone bit, the analytical equations and performance analysis method is established. The problem of accurate calculation about the meshing clearance of ring gears is solved; the optimization problem of tooth structure parameters is also figured out about ring layout, pitch distribution and so on; the performance indicators are also analyzed and calculated about bottom cover, bottom track and horizontal sliding and so on. With the method, the drill bit performance could be predict analyzed and the design can be evaluated that enhance the design science and reliability.

Abstract: In this paper we present the cold extrusion shaping technology of 20Cr bevel gears. First, we analyzed a series of processing and treatment referring to bevel gear cold extrusion technology and calculated the cold extrusion pressures used for mold design; then, we designed and cold extruded two- or three-ring composite cold extrusion dies with its precise guiding device; and last, we experimentally tested our designed and extruded bevel gear. The results showed that 20Cr bevel gears shaped with cold extrusion have qualified properties and satisfy application requirements within the required error range. This research is of significance in actual cold extrusion production.

Abstract: Electric energy is the most convenient and clean energy sources, and it is used far and wide. While there are many problems of power quality which imperil greatly electronic loads. Modern times, high quality power supply is required by modern manufacturers, and a quick and efficient energy storage technology is now starved for in order to improve and solve the transitory power quality.As a new kind of energy storage component, super capacitors have fast response, high charge-discharge efficiency. This paper focuses on the application background that the super capacitor DC energy storage unit can improve the quality of electric energy, establish a mathematical model of the storage unit, analysis and design the control scheme of super capacitor DC storage energy system, to achieve rapid compensation of the instantaneous power of the system, effectively improving the power quality and stability of the system.

Abstract: In order to increase drying rate at initial stage, the heat pump drying systems often lift temperature of the drying air assisted with electrical heating. However, power consumption of drying systems is raised. By taking advantage of an auxiliary evaporator and adjusting its fluid fluxes, the heat pump drying systems can acquire the same results of lifting temperature as those assisted with electrical heating. Experiment results demonstrate that the heat pump unit with an auxiliary evaporator is able to not only lift temperature quickly at initial drying stage, but also enhance the material dehumidification obviously when drying temperature ranges from 40°C to 55°C.

Abstract: Interchangeable Turning Sprue Bushing (ITSB) is a small insert at the centre of core side used to change runner directions for injecting 2 different products in a separate injection mold by shifting the melt filling to the cavities. The development of ITSB is significant in cutting down cost and time consumed during fabrication of a multi cavity family mold. In this study, the tensile and flexural test pieces were designed using CAD Solidwork. The test pieces analysis was performed using CAE Cadmould simulation in order to observe the melt flow of four multi cavities family mold incorporated without and with ITSB insert. The Cadmould simulation was used specifically to analyse the melt filling, temperature distribution and volume shrinkage of the test pieces. The simulation result demonstrated that ITSB is a useful insert that can be used to overcome problems encountered in the family mold system by balancing the melt filling, minimize temperature distribution and reduced the differential of volume shrinkage of the test piece manufactured. ITSB also reduced the frequent defects formed during production such as short molding, flashing and warpage.

Abstract: Cathode protection is a common ship electric protection method, a large number of researchers studies cathode protection by making appropriate ship models and then applied to the actual ship. However, the design and production of ship model will directly affect the results of the study. In this paper, firstly analysis the similarity theory from the perspective of cathode protection, then propose the considerations when designing a ship model according to the analysis results and finally gives a electric field distribution characteristics when a finished ship models doing cathode protection. From the results, this paper consider the cathode protection, proposed the design factors for producing a good performance scale ship model.

Abstract: To improve the optimization performance of particle swarm, an adaptive quantum particle swarm optimization algorithm is proposed. In the algorithm, the spatial position of particles is described by the phase of quantum bits, and the position mutation of particles is achieved by Pauli-Z gates. An adaptive determination method of the global-factors is proposed by studying the relationship among inertia factors, self-factors and global-factors. The experimental results demonstrate that the proposed algorithm is much better than the standard particle swarm algorithm by solving the function extremum optimization problems.

Abstract: Photochemical Machining is a novel machining process capable of processing wide range of hard-to-machine materials. This research addresses modelling and optimization of the process parameters for this machining technique. To model the process a set of experimental data has been used to evaluate the effects of various parameter settings in machining of SS316L. The process variables considered here include etchant temperature, time and concentration. Undercut, as one of the most important output characteristics, has been evaluated based on different parameter settings. The full factorial method and regression modelling are used in order to establish the relationships between input and output parameters. The effect of control parameters on undercut was analysed using Analysis of Variance (ANOVA) technique and their optimal conditions were evaluated. It was found that etchant temperature and etching time are the most significant factors for undercut.

Abstract: This paper researches the current methods of liquid measure in the recuperator, for the deficiency of current detection methods, design a new system for measuring the liquid volume. The system changes the gas pressure and volume by releasing liquid ,and utilize pressure sensor to measure the liquid volume. Using advanced sensor technology and computer technology to quickly and accurately calculate fluid volume，effectively solve the conflict between accuracy and efficiency.

Abstract: In order to build a platform for overhaul and simulation training of CCIS (Command Control Information System), the simulation model of the hydraulic supercharger was established. By the model the simulator of hydraulic supercharger was designed and developed based on virtual instrument technology and SCM (single chip microcomputer) technology, the software of the simulator which was designed by the LabWindows/CVI provided a virtual interface and the hardware of the simulator which was developed with the SCM system gave the correct signal. As a result, when the simulator of hydraulic supercharger was connected to the CCIS, the simulation result was realized to be consistent with the real hydraulic supercharger.