Advanced Materials Research Vols. 383-390

Abstract: Using magnetron sputtering technology, the CuInSi nanocomposite thin films were prepared by multilayer synthesized method. The structure of CuInSi nanocomposite films was detected by X-ray diffraction (XRD), the peak of main crystal phase is at 2θ=42.180°; the morphology of the film surface was studied by SEM. The SEM images show that the crystalline of the film prepared by multilayer synthesized method was granulated, differed from the needle shape which was the morphology of the CuInSi film prepared by magnetron co-sputtering.

Abstract: The paper present solidifying technology based on geopolymer theory of inorganic composite materials from bauxite, red residue from bauxite ore, fly ash and activators for road building projects in Vietnam. This study describes physical properties and chemical compositions of bauxite, red residue, fly ash and the effects of bauxite-red residue-fly ash-activator mixes on the geotechnical properties of inorganic composite materials. Mixture design and testing procedures for inorganic composite materials. New inorganic composite materials have high durability and ability to water resistance. The presentation also show microstructure analysis of inorganic composite materials based on bauxite residue, fly ash and activators by X-ray diffraction, Infrared spectroscopy (IR), transmission electron microscopy (TEM) display high density, and modified microstructure of inorganic composite materials. Construction method of road using inorganic composite materials is also presented.

Abstract: In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.

Abstract: We filled different proportions of inorganic packing(nano-silica) in the epoxy resin and investigated the flexural properties of modified epoxy resin compared with pure epoxy resin, based on the mechanics experiments using Zwick/Roell equipment. The experimental results showed the performance of modified epoxy resin by proper proportions of inorganic packing increased significantly compared with pure epoxy resin, but excessive inorganic packing had no help in improving the performance of epoxy resin and even cause some decline of the properties.

Abstract: Recently the growing demand for light weight products with high strength has been increased by the rapid development of automobile and aircraft technology. Also, reduction of carbon dioxide emissions is one of the most important issues also in the automobile industry. The weight reduction technology is important even if applied to electric vehicles rather than gasoline vehicles, as reduction of energy consumption is an important issue. Plastic processing of hollow pipes is an important technology for realizing weight reduction of automobile components. As an example of research into pipe forming there is the research by Ohashi et al. [1-2], who have carried out processing to enlarge pipe diameters using a lost core, which achieved suppressing reduction in wall thickness and greater pipe expansion than hydro forming. The authors investigated into a method of increasing the wall thickness of pipe by press forming. Using the finite element analysis method it was predicted that it is possible to increase the wall thickness of aluminum pipe with 2mm wall thickness by approximately 20% by hollow pipe press forming. Also, it was predicted that it is possible to increase the wall thickness by approximately 30% in places by eccentric pipe wall thickness increase. Also, the effect of the metal die which has a large effect on processing a pipe from a circular cylindrical shape to a rectangular tube shape was investigated.

Abstract: The aim of this work is to get the ferrite nucleation criteria from the recrystallized austenite grain after hot deformation in non isothermal condition. A series of rolling experiments have been performed with industrial C-Mn steel in two different temperatures of 1060 and 960 °C with sequence cooling cycle. The microstructure changes that taking place during hot rolling and after cooling has been examined by metallographic evaluation which allows the identification of ferrite transformation after austenite recrystallization. The recrystallization control was carried out using interrupted cooling method to obtain transformation from actual austenite grain. Using an approach of grain boundary interfacial area (Sv) calculation, which attempts to account the number of sites for potential nucleation of ferrite in thermomechanically processed austenite, an essential correlation of the correspond measured grains was developed. The influence of delay interval time after recrystallization to transformation is observed and the implication obtained is discussed. From those results, a hypothetical interaction between parameter and nucleation is described. It is concluded that, strain and holding time has a major role on the recrystallization process of austenite and bring an effect to ferrite grain refinement. The calculated Sv has indicated the potential sites of nucleation that are proliferated with increasing strain.

Abstract: Along with our country urbanization step of speed, and a high focus on the Chinese Government to build a countrywide infrastructure network, The Chinese rolling stock industry has seen strong development both in terms of volume and technology in recent years. Currently competition in the market is limited, but with the rapid technological development, more and more competitors are about to emerge. This paper made a detail analysis on Chinese rolling stock industry including its production and market, equipment and technology, development problems and potential, and indicated the main indifference between national industry and international one on this field. At last, author gave the primary suggestions and strategic ideas to the decision makers.

Abstract: Advantageous properties of plastic materials, low investment costs for a production, cheap and productive processing method were given the rapid development of plastic materials. In this time injection molding technology is the most using technology for processing plastics in our country. Quality of the plastics processing depends mainly on the quality of material and preparing it for production. The first step in the processing of plastic by injection molding is dosing of granulations from hopper of injection machine unit. Task of this contribution is to theoretically describe a pneumatic method for transport of granulations in injection molding machine.

Abstract: A generalized upper bound solution for the deformation of ring in the ring rolling process has been formulated. An admissible velocity field and strain rates are derived from the parametric definition of streamlines in the deformation zone. This new formulation was used to predict the upper bound on power. Minimizing the upper bound power with respect to neutral point position, the neutral point position and the rolling force were determined. Using the theory presented here, the variation of internal, shear, frictional and total powers with respect to ring revolution are discussed. Some of the results obtained from analysis were compared with experimental results.

Abstract: Today with the latest technology the information beyond tool movement and switching instruction such as tooling, manufacturing features and process sequences are needed to support global adaptability for manufacturing with a specific focus on CNC-based manufacture This research focuses on the use of the new standard; ISO 14649 (STEP-NC), to address the process planning and machining of discrete turn/mill components and proposes a STEP Compliant NC structure for generation of ISO 14646 code which can be used for turned component manufacture. The novel application of this work is STEP-NC compliant process control where the research will utilise and extend the standard for in process measurement at the machine and also explore the application and integration of the STEP-NC standards. The major contribution of this research is the review of a computational environment for a STEPNC compliant system for turn/mill operations.