Abstract: Orthogonal cutting experiments of Fe-36Ni invar alloy are performed. The change of chip morphology with cutting conditions are investigated through metallurgical observation, and the critical cutting speed of adiabatic shear for Fe-36Ni invar alloy at different cutting depths and rake angles are given. In addition, the characteristic of chip deformation before the occurrence of adiabatic shear is also analyzed. The results show that the critical cutting speed decreases with the increase of cutting depth and hardness, but increases with the increase of rake angle. The deformation coefficient tends to a constant value with the increase of cutting speed.
Abstract: Current methods for measuring Globoidal cam exist these problems: difficulty of measurement of profile machining error, heavy dependency on expensive measuring equipment and low measuring efficiency. In order to solve them, this paper established a high efficient virtual measuring method for globoidal cam machining errors. Based on virtual measuring theory and globoidal cam space engagement theory, and by taking the three-dimensional machining simulation models of the globoidal cam profile as the measured object, the virtual gauge head can do measurement along the planned measuring path. The machining error calculation method was determined according to the degree of geometric interference between virtual gauge head and the surface of machined models. And a virtual measuring system on UG platform for globoidal cam profile machining errors was built by use of Visual C++ 6.0 and UG/Open API secondary development tools. Finally, a virtual measuring experiment was performed for the two kind of machining simulation models generated by generating method and one-side machining method. The experimental results show that the high efficient virtual measuring method for globoidal cam machining error is correct and the virtual measuring system is reliable. On the one hand, an effective method is provided to achieve an efficient, low-cost measurement for globoidal cam profile machining errors in this paper. On the other hand, it has great engineering guiding significance for the actual production and processing of globoidal cam.
Abstract: Dynamic mold temperature (DMT) injection molding is a molding process that the mold cavity is first rapidly heated to a high temperature before plastic melt injection, and then cooled quickly after filling and packing stages. With this technique, plastic parts with very good surface performance can be produced. However, as the special mold structure and its worse working process, large stress concentration can be caused in the mold. Consequently, the mold for this new injection technology can be easily fatigue and the lifetime of the mold is inevitably decreased. In this paper, the structure of the mold was presented first, and then the working process and factors influencing the lifetime of the mold were analyzed. Through numerical simulation, the fatigue source of the mold was evaluated. Results showed that the evaluation process presented in this paper was very in accordance with the practical failure mold.
Abstract: Based on the servo system of an Opto-Electronic Stabilized Platform, the idea of blocking software were developed and the process of the design was introduced detailedly by analying the framework and functional requirements of the systerm . At last,the software was finished according to the idea of blocking software.the function and dependability was tested on the state of XDS510 USB2.0 DSP emulator. The test indicated that the design of blocking software improved the dependability of the system, shorted the period of the software empolder .the software was provided with well expansibility, maintenance ability, naturalization ability, cutting ability,mensurability and excellent guidance for the similar system.
Abstract: The amorphous alloy application is limited because of its brittleness property. Based on the grain structural characteristics of nanocrystal alloys, the mechanical behavior of the amorphous/nanocrystal Ni-Mo alloy is investigated in this text. The microstructure of the deposit and the crack propagation were discussed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results show that amorphous/nanocrystal Ni-Mo alloy has a higher microhardness, a strong binding force between a certain thickness coating with the substrate.
Abstract: To surface milling cutters for research object, established considering the single spindle partial pendulum milling cutter tooth surfaces of high speed cutting 3d surface morphology simulation model by using graphic matrix transformation principle and vector algorithms. Comparing the simulation and forecast of surface morphology and surface roughness with the actual machining surface morphology and surface roughness by using the workpiece simulation algorithm meshing, we verify the correctness of the simulation model. The simulation analyses the influence regularity of surface morphology and surface roughness by changing cutting parameters and geometrical parameters. This can help us choosing the reasonable cutting parameters and geometrical parameters and have significance on the actual machining. The surface milling cutters are high efficiency and good quality of cutting big plane or curved surface. With the development of high speed cutting technology, in high speed milling process, product crumbs tumor and scales thorn hardly exists, so cutter geometrical parameters, cutting data and so on will be the main influence reasons of surface roughness. In order to satisfied the quality requirements, at present, we choice tools and determine the milling parameters depending on experience but it is limited. The surface roughness of the processing components is reflected intuitively by processed surface of microscopic geometric shape. So surface of microscopic geometric shape produced by theory emulation is significant to forecast the surface roughness and selecting reasonable cutting parameters. Currently, there are some simulation method researches about surface of microscopic geometric shape. Zhao Xiao ming et al [1, 2] has researched the simulation modeling of microscopic geometric shape of ball end mills during processing; Xu An ping et al [3, 4] has researched the simulation modeling methods of peripherally milling processing; Zhang Guang Peng et al  has researched the inversion multiple tooth surfaces of the milling cutter surface morphology simulation and develop simulation software. But all above researches are ideal simulation of surface shape. There are few researches about simulation of surface shape on condition of spindle partial pendulum. Based on object of surface milling cutters, this article researches simulation modeling methods of surface topography on condition of high speed milling and give an account of the corresponding simulation algorithm. From the article, we also get the influence law of microscopic geometric shape depending on different milling dosage, cutter geometrical parameters and eccentric quantity and get the significance conclusion to actual production.
Abstract: In order to maximize the power of photovoltaic generation system, it is necessary to track the maximum power point (MPP). A new control algorithm of photovoltaic (PV) was proprosed, which applied constant voltage tracking method (CVT) to adjust the working point around the MPP and ensure fast tracking when external conditions or loads changed suddenly. The algorithm used the optimal gradient method (OG) to make optimization of the steady-state characteristic and could effectively reduce the output power of photovoltaic array oscillation around maximum power point tracking (MPPT). The experiment and simulation results show that the proposed algorithm could track the MPP rapidly and accurately. And also could improve the energy conversion efficiency of PV generation system by reducing the output power oscillation around MPP.
Abstract: This paper demonstrates techniques for modeling fluid-structure interactions with moving mesh in COMSOL Multiphysics. It illustrates how fluid flow can deform surrounding structures and how to solve for the flow in a continuously deforming geometry using the arbitrary Lagrangian-Eulerian (ALE) technique. The ALE method handles the dynamics of the deforming geometry and the moving boundaries with a moving grid.
Abstract: This brief introduction to the needs of the project background, the need for format conversion and conversion work-related theories. By comparing the current format has several ways of combining the actual situation of the project was based on Arcmap format conversion studies, and the converted coordinate system conversion, the registration layer, the topology of layers are discussed. Experimental results show that the format conversion, graphics conversion and the geometric consistency problem is a good solution, the data described in this article work for GIS applications and communications infrastructure to provide a reference for information research.
Abstract: The historical records of mechanical fault contain great amount of important information which is useful to identify the similar fault, but the structural representation and the knowledge reasoning problem are troubled that we use the historical records effectively. Aiming at the problem, the fault knowledge representation based on ontology is put forward out. Firstly, the knowledge characteristics, the ontology building significance and principle of fault are analyzed. Secondly, the fault ontology is defined and described. Finally, the applications of fault diagnosis ontology are studied in protégé. The case study shows that the fault knowledge representation based on ontology is very intuitive and efficient; it can provide us a novel way to deal with the fault diagnosis problem.