Advanced Materials Research Vols. 328-330

Abstract: According to the characteristics of aero products, the products must be as simple and light as possible under the premise of ensuring the performance. Using the finite element analysis software ANSYS to establish a nonlinear contact model about a new type of composite shaft-hub connection structure which is used in the propeller. Based on the model to give a optimization about the elastic ring, part of the shaft-hub connection structure, which defines the semi-cone angleαand the width B of the elastic ring as the design variables, the stress of the elastic ring as the state variables. The optimization results lay the theoretical basis of designing a composite shaft-hub connection structure which meets the requirement of aero products.

Abstract: Currently, the power supply and control equipment of China’ coal are widely used flameproof. Although it play a very important role in the production, because of the deficient of its structure and technical when workers in illegal operations it can’t timely cut off the power and in all probability produce electric spark that can cause a serious gas explosion accidents. This paper gives a brief introduction of closure device of the small isolate explosion switch which can automatically cut off the power when the workers in illegal operations. Thus it can fully guarantee the switch won’t produce electric spark whenever the workers in illegal operations.

Abstract: An open double coordinates computer numerical control (CNC) system was developed, which was based on PC and PMAC motion controller card. A miniature and teaching CNC lathe machine was developed with a simple structure, low cost, small volume and suitability for teaching. The CNC system had the advantages of 2-axis linkage, program editing, manual operation, inching operation, simulation processing operation, automatic operation and dynamic display of the tracing. The system was based on the Windows XP platform. Its interface was friendly and it was convenient to manipulate.

Abstract: The purpose of this study was to recognize and analysis the option value of supplier’s involvement in the collabotative project. Using real option theory, this paper began by distinguishing two forms of exit mechnisms for a collaborative project between enterprises in supply chain, and then analysised the anticipated project value of every participation by different exit mechanism. Research conclusion shown, the option behaviour of common termination is endogenetic in project, and every participant will get benifit through making the parterners’ agreement consistency, which emphasis the collaboration nature of partnership. Unilateral termination of collaborative project is an non-cooperative behaviour which will incur loss of parterner’s benefit and reduce the project’s overall value.

Abstract: Software project quality management is the important work throughout the entire software life cycle, the effective implementation of software product quality control is an important means of improving software quality and reducing the cost. For the difficulty of quality control, research the control flows and techniques. First, describe the quality control process including prior quality control, matter quality control and afterwards quality control. Then, research the quality control flows through graphs. Finally, by combining graphs and textual descriptions to research quality control techniques, including four commonly used techniques such as cause-effect diagram, Pareto diagram, control chart and run chart. The results show that, through the study of quality control flows and techniques provide techniques and methods to support quality control and improve the science of quality management.

Abstract: The traditional heat pipe has shortage about interference of evaporator channel and return channel, separating evaporation channel with the return channel, building in axial pump to force the fluid flow, the internal suction flow heat sink with forced circulation is designed. By numerical simulation, this heat pipe has a better effect to heat transfer. The influences of structural parameters to heat transfer effect are analyzed.

Abstract: The structure of progress die is generally more complex and need higher precision, so it needs a longer development cycle, especially for the progress die design of sheet metal with free form surface. In this paper, taking a relatively complex part with free form surface for instance, NX PDW which has highly automated design capabilities was applied to finish the mold design, and the key steps and methods of designing such parts with PDW was put forward. In the design process, the stamping simulation software Dynaform was also applied to simulate the key process to predict forming defects and assess the formability of sheet metal. The results show that the application of Dynaform and PDW can improve the design quality and efficiency greatly.

Abstract: The grain flow lubrication, based on Haff's grain flow theory and the Patir/Cheng flow factors method, is applied in the simulations of rough slider bearings and chemical mechanical polishing. In this paper, the results of flow factor, the performance of rough slider bearings and the mechanism of the CMP process for grain flow are briefly demonstrated. An improved CMP model, considering the partial hydrodynamic grain flow lubrication and elastic-plastic microcontact theory, is also proposed. The contact area ratio and the elastoplastic contact area ratio are presented to improve the understanding of CMP mechanisms.

Abstract: A method used to determine the residual stress in a hard film deposited on a soft substrate via the unloading load-depth curves was proposed. The unloading curves with transitional behaviors were used to determine the film deflection stiffness, and then the residual stresses were obtained. Significant extra stresses were induced by a cube corner indenter at large depth. In contrast, the indentation-induced stresses could be neglected in cases of Berkovich indentation at relatively small depths.

Abstract: The manifolds of airbag inflator were used to be produced by sheet-metal forming. It comprised at least eleven forming stages to achieve its final shape. Uneven wall thickness and poor dimensional accuracy were the common defects because the planar anisotropy of sheet-metal caused earing on the cup rim. In this study, the cup-shape workpiece is obtained from backward-extrusion of billets, followed by two stages of end-forming of tube and three stages of hole-piercing. During the end-forming production, the tool life of the first forming stage was the most severe because it applies close-die forging to increase its rim thickness. Therefore, in addition to the design of prestressed die insert, special attendance is paid to the partition of the die insert to further alleviate the stress level. The optimization of die insert was aided by the finite element analysis of DEFORM software. The results show that by lowering the parting line, the stress level can be minimized. The tool life can therefore be improved.