Advanced Materials Research Vols. 482-484

Abstract: As there are various machine configuration and frequent changes of cutter orientation in 5-axis machining, the standard NC codes are not inter-exchangeable among machines. This phenomenon induces a lot of cutting difficulties and machining problems such as the inconvenient working process for operators and very low cutting efficiency. At present, some advanced machine controllers already can accept the APT code besides NC code to increase the cutting flexibility. They also offer some advanced machining functions such as tool center point control and spatial compensations of tool, etc. By way of APT interpreting, the common controller can also implement these advanced functions. Besides, CAD/CAM software also supports APT post-processor to generate NC code for different machine configurations. This means the application of ATP program has played an important role in five-axis machining. However, although CAD/CAM software supports the interpretation of APT program as a core key technology of five-axis machining, the manufacturers of controller with advanced functions are unwilling to open their system. Up to now, there has been few related research papers published on this topic. In this paper, we proposed an APT interpretation method for five-axis machining. This method includes seven functional modules and related implementing procedures. A case study has been adopted to demonstrate the feasibility of the proposed method. The research result could be adopted as a reference to develop the value-added technology in 5-axis machine tool application for academy and industry.

Abstract: Network courses construction and research, explained the concept and the content of Network curriculum, the main technical keys of the network course construction, and discusses the methods of using Dreamweaver Web Editor developing network course based on Web platforms. "Digital Electronic Technology" online course design and implementation of an example, introduced the principle of network curriculum design, and the technical Specifications of teaching development.

Abstract: With the advent of multibody dynamics software (ADAMS) , it has become one of the main simulation techniques to build a multibody system (MBS) in order to evaluate the dynamics performance. The modeling of some component parts such as anti-roll bars and torsion beam rear suspensions is always difficult for the unique structural and non-linear characteristics.A joint force actuator based on multibody dynamics was introduced to represent the component within suspension systems. The kinematics analysis of the torsion beam rear suspension was carried out to validate accuracy and rationality by means of joint force actuators in ADAMS/Car. The result shows that the joint force actuator can be used in the MBS modeling and simulation analysis of non-linear characteristics conveniently.

Abstract: Objective: To optimize process parameters and determine system of culture and collection cells microspheres by Fluent software. Method: Hypothesises of boundaries were brought forward of preparation cell microspheres. Parameters, the mesh and relevant conditions of cells microspheres were determined.Result: Parameters of the optimal process were determined by the flow field analysis of cell microspheres. Moreover the strategy of culture and collection cell microspheres were completed.Conclusion: The results may be caused research a equipment of proliferation cell micropheres. This is probably a consequence of reduction bankroll of development equipment of culture and collection cell micropheres.

Abstract: Abstract: In order to realize the function of automatic assembly of the standard mold base, simultaneously, realize the intelligence and automation of products, the automatic assembly system is analyzed and researched, the design and development of the automatic assembly are completed and the executable files are exported through the function provided by the tool of UG/Open API, which make the mold automatic assembly realistic, the structure of product design and assembly optimized, the product development cycle shortened and the efficiency and accuracy of assembly improved.

Abstract: Diffuser augmented tidal turbines are getting enormous attention due to their immense potential to increase the generated power output. Researchers around the globe are investing considerable time and financial resources in this domain. Limited research results are available for diffuser augmented tidal turbines due to their emerging nature, large and costly research and development setup, startup cost and proprietary issues. Turbine enclosed in a diffuser is based on the principle that the generated power output by a tidal turbine is directly proportional to the cube of velocity of incoming fluid flow. Thus, even a minor increase in velocity considerably increases the generated power output. The diffuser helps accelerate the incoming fluid flow. Hence, the efficiency of the turbine is significantly increased by using a diffuser. It is challenging to accelerate the incoming flow by using a diffuser due to its shape, geometry and fabrication limitations. The diffuser design requires great deal of innovation and time investment. The purpose of this paper is to present the study of 2D model of diffuser for tidal current turbine. The study involves developing a 2D CFD model of diffuser, acquiring simulation results and comparison with experimental results. The mesh is generated in ICEM followed by simulation in CFX. The simulation results are compared to experimental results and found in reasonable agreement. The research is essential to utilize CFD tools for diffuser design used for tidal current turbine.

Abstract: In this work, the effect of metallurgical parameters (i.e. alloy chemistry and aging parameters) on the mechanical properties of 319 alloys was investigated, with the aim of adjusting these parameters to produce castings of suitable mechanical properties. An attempt has been made to quantify the effects of alloying elements (Mg, Sr, and Ti) and aging parameters on the mechanical properties of heat-treated (T5 and T6) 319 alloys. Exploring the heat treatment differences between T5 and T6 for 319 alloys would help in selecting the metallurgical conditions required to achieve the optimum and maximum mechanical properties. Aging treatments were carried out for 319 alloys in the T5- and T6-condition at 150°C, 180°C, 200°C, 220°C and 250°C for 4, 8, 16, 24 and 48 h, followed by air cooling. Aging treatment at a lower temperature of 150°C produces fine and dense precipitates having a smaller inter-particle spacing, while at higher aging temperatures, such as 250°C, the precipitates are coarser in size, less dense, and more widely dispersed. For 319 alloys, crack initiate and propagate mainly through the debonding of Si particles from the Al matrix and through the cleavage of β-iron intermetallics. Fracture of intermetallic phases in the interdendritic regions is mostly brittle, with the formation of microcracks at the Si, Cu, Fe-base intermetallics and aluminium interfaces. Experimental correlations of the results obtained from the mechanical properties measurements are analyzed and correlations that relate the alloying additions and heat treatment to the ultimate tensile strength (UTS), yield strength (YS) and total percent elongation (%E) of such alloys are found. Different levels of magnesium content (%Mg), Sr-modification (Sr-ppm), aging parameters (temperature and time) were tested. The effect of alloy additions (Mg, Sr and Ti) and aging heat treatment parameters (Temperature and Time) on the mechanical properties and alloy performance of cast and heat treated 319 alloys are investigated. It was found that the strength of 319 alloys increases with the magnesium content and decreases with the Sr-modification (Sr-ppm) and aging parameters (temperature and time). Increasing the Mg content in primary 319 alloys up to 0.45% enhances the alloy response to heat treatment in the T5 and T6 Tempers, more particularly, the T6 one. Sr-Modification of high Mg content 319 alloy in amounts of ~360 ppm leads to a noticeable decline in alloy strength due to porosity formation which counteracts the beneficial effect of the modification. Sr-modification has a negative effect on the % elongation results of Mg-content 319 alloys due to the Mg-Sr interaction in the aged-T6 conditions. However, grain refining of the Mg and Sr content 319 alloys produce sounder castings with finer grain sizes

Abstract: Integrated progress of S&T is the important factor in the Economic and Social System. Based on the analysis of the economic and social growth and integrated progress of S&T in Hubei Province during Eleventh Five-Year, with the concept of the system and in the perspective of input and output, this paper used the national statistics and the regional scientific and technological progress monitoring indicators, put forward to the deep comparative analysis among Hubei and Guangdong, Jiangsu, Shandong, Zhejiang and Fujian provinces in the eastern on socio-economic growth, integrated progress of S&T and promotion of S&T to economic and social development, then some countermeasures how Hubei to enhance the role of S&T were put forword.

Abstract: In the knowledge-economic century, technologies and ideas of knowledge management to are becoming the important means to improve quality management for enterprises to win the core competition. This paper focuses on identifying the quality knowledge and activities of quality management in the collaborative manufacturing process, distinguishing quality knowledge in the quality management which exist large numbers of data and building a quality knowledge management system model based on knowledge maps.

Abstract: It is an important link for supporting business operations and decision-making to select optimal model from multiple models. Based on the analysis on traditional dichotomy model evaluation methods, the paper presented a kind of method to evaluate model performance that consider multiple individual evaluation indexes to compute comprehensive index ranking score. The method solves the problem of difficulty for modeling personnel when using multiple traditional evaluation indexes to evaluate a group model that different conclusion caused by different methods. The evaluation example based on the method shows that the weighted comprehensive index based evaluation method is of reference value for the optimal selection of dichotomy model.