Papers by Keyword: Process Parameter

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Authors: Jie Li, Yuecun Wang
Abstract: Pearl fiber is evenly mixed with ultra-fine pearl particles spinning solution of cellulose fibers, made of a blend of functional spinning of regenerated cellulose fiber. This new fiber material not only preserves the beauty of pearls skin function, but also cellulose fiber material with moisture breathable, soft and comfortable, and other features. In this paper, on the basis of understanding of pearls on the fiber properties, being blended with cotton, for pearl yarn fiber blends high technology design. According to the design of spinning yarn spinning process of high principle requires, selecting process, determining the opening and cleaning, carding, combing, drawing, roving, spinning the reasonable parameters of procedures. At the same time, the problems in the spinning process and technical measures to be described. Include optimizing the process configuration, temperature and humidity control, choose the appropriate spinning equipment. For the development of high functional pearl textiles, clothing to meet consumer comfort, functionality needs make a help.
Authors: Zhen Bo Wang, Zhen Jia Li, Deng Hui Zhu
Abstract: Focusing on the machining complexity of large containers where difficult-to-cut materials are used a lot, a cutting process parameter optimization expert system for difficult-to-cut materials is constructed based on experts’ knowledge and computer soft wares (VC++ 6.0and SQL Server 2000). In this paper, we made construction analysis and module design for the expert system, then constructed the knowledge base according to certain constraint models, and realized the functions of every module of the expert system by using the forward inference. This expert system can play a scientific direction role in the process parameters selection for cutting large containers.
Authors: Roberto G. Citarella, Pierpaolo Carlone, Marcello Lepore, Gaetano S. Palazzo
Abstract: Medium to high strength aluminum alloys, such as 2xxx, 6xxx, and 7xxx series, are actually considered of great interest in the transport industries. For aeronautical applications, the precipitation hardenable AA2024 (Al-Cu) alloy is gaining considerable attention, in particular for the realization of nose barrier beam or fuselage panels. In this context, remarkable research effort is currently focused on the application of the Friction Stir Welding (FSW) process, as a suitable alternative to fusion welding processes. The interest in aeronautical application of FSW process is also justified by the reduction of production costs and weight and by the increase of strength and damage tolerance with respect to riveted lap joints. The implementation of the technique in safety-critical components, however, requires a deeper understanding of static strength as well as of fatigue behavior of FSWed assemblies. In this sense some experimental results have already been presented in the inherent literature, relatively, for instance, to AA6082-T6 and AA6061-T6, AA6063-T6, AA2024-T351, AA2024-T8 alloys processed by FSW. Despite the unavoidable relevance of experimental testing, a numerical approach able to predict the mechanical behavior of FSWed assemblies is very desirable, in order to achieve time and cost compression and to implement computational optimization procedures. This paper deals with a numerical investigation on the influence of FSW process parameters, namely the rotating speed and the welding speed, on fatigue crack growth in AA2024-T3 butt joints. The computational approach is based on a combined Finite Element Method (FEM) and Dual Boundary Element Method (DBEM) procedure, in order to take advantage of the main capabilities of the two methods. In particular, linear elastic FE simulations have been performed to evaluate the process induced residual stresses, by means of a recently developed technique named contour method. The computed residual stress field has then been superimposed to the stress field produced by an applied fatigue traction load in a Dual Boundary Element Method (DBEM) environment, where the simulation of a crack, initiated and propagating along the previously mentioned cutting line, can be performed in an automatic way. A two-parameters crack growth law is used for the crack propagation rate assessment. The DBEM code BEASY and the FEM code ANSYS have been sequentially coupled in the aforementioned numerical approach by using a BEASY interface module and in house developed routines. Computational results have been compared with experimental data, showing a satisfactory agreement. The influence of process parameters on the residual stresses distribution has also been highlighted.
Authors: Jian Xiong Ye, Fa Yun Zhang
Abstract: Magnesium matrix composites are prepared with a hybrid optimizing metod here. Different SiC volume fractions, processing temperature and stirring time have different influence on tensile strength and elongation of SiC; but how to find out the satisfied treating parameters is an unavoidable question, a hybrid method is put out and experiments prove the effectiveness of research work.
Authors: H.H. Kim, Il Soo Kim, K.S. Chon, J.Y. Shim, B.Y. Kang, I.J. Kim
Abstract: With the advance of the robotic arc welding process, procedure optimization which selects the welding procedure and predicts bead geometry that will be deposited is increased. A major concern involving procedure optimization should define a welding procedure which can be shown to be the best with respect to some standard and chosen combination of process parameters which give an acceptance balance between production rate and the scope of defects for a given situation. In this paper, bead-on-plate welding using an infrared thermography during robotic CO2 welding process has been conducted to obtain the thermal profile characteristics and develop the empirical models which influence process parameters on bead width with the help of a standard statistical package program SAS. The comparison with values of coefficient of multiple correlations for curvilinear and linear equations presents no differences, which indicate that the developed equations are reasonably suitable.
Authors: Bai Dong Jin, Guo Hui Cao, Zhen Long Wang, Wan Sheng Zhao
Abstract: A new micro EDM method is described. First, the basic principles of micro EDD are analyzed and realized conditions are predicted. Then with an ordinary EDM shaping machine and electrode brass, steel and tungsten, a large number of experiments are carried out in air to obtain the effects of different processing parameters on micro EDD. A micro cylinder with 0.19mm in diameter and 7.35mm in height is formed on high-speed steel surface. By exchanging the polarities of electrode and workpiece the deposited material can be removed selectively, thus the reversible machining is realized. In the end, measurements show that the deposited material is compact and hardened, whose components depend on the tool electrode material although Zn in brass electrode is oxidized to ZnO.
Authors: Xi Jing Wang, Chang Qing Zhang, Bo Qiang Li, Tian Li
Abstract: Dissimilar metal of Steel and Magnesium alloy used for friction stir spot welding is studied. Based on using orthogonal test method optimizes the process parameters and gets satisfactory joints , SEM is used to observe the features of joint,XRD is applied to determine the joint phase, and the results show that: the design of rotating tool without pin is reasonable and it can form satisfactory joints without keyhole of spot welding. The performance of spot welding joint depends on the extent of diffusion of Zn and Mg and high weld consistency. There is small existence of intermetallics made of MgZn2,Mg0.97Zn0.03 in welding joint.The properties of joint depends on the intermetallics, Due to this,The microhardness of joint increases gradually from the magnesium side to steel side.
Authors: Tian Biao Yu, Peng Cheng Su, Jing Qiang Zhang, Peng Guan, Wan Shan Wang
Abstract: A grinding simulation system is developed based on the technology of virtual reality. Simulation theory based on virtual reality is introduced and architecture workflow and operation of the system is studied. With the system, simulation of grinding process of all kinds of materials can be done, influence law of grinding wheel parameters (abrasive grain sizes, bond materials, grinding wheel diameter, etc.) and process parameters (grinding speed, workpiece speed, axial feed workpiece materials, etc.) on machining quality of the workpiece can be analyzed, machining quality can be forecasted and optimization of grinding process parameters can be gained.
Authors: Xian Ming Yang, Lin Liu, Juan Xiu Lin
Abstract: With high optical transparency and electrical conductivity, ITO thin films were fabricated by DC magnetron sputtering. Based on orthogonal test table L18 (35), the effects of process parameters included water partial pressure, work pressure, substrate temperature, oxygen flow rate and sputtering power, on the optoelectronics properties of ITO thin films were investigated in detail(systematically). Calibration of sheet resistance transmittance, atomic force microscope, and X-ray diffraction were employed to characterize the ITO films.
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