Applied Mechanics and Materials Vols. 34-35

Abstract: Mold shelf of powder molding press(PMP) is the main load component. Control the deformation of mold shelf is a key problem. In this paper, based on the basic theory of finite element analysis(FEA), the constraints and load conditions of main support parts of mold shelf were simulated and analyzed . ANSYS software optimized the structure of mold shelf. Top width of the stress part increased to 15mm, its height from 80mm down to 50mm. The results showed that the maximum displacement of mold shelf reduced to 0.4740mm, the maximum stress reduced 843.44MPa to 742.38MPa. Load distribution of the mold is more uniform, deformation and displacement also improved. It provides a new method and theoretical basis for optimal design of powder molding shelf.

Abstract: In ammunition systems, clock mechanism was often used as timing mechanism for ammunition fuze in order to make ammunition work again at a time (or distance). Since shells were in a unique centrifugal environment, clock mechanism was of non-energy storage. Centrifugal force of the projectile was used as the driving force for clock mechanism. Timing principle of clock mechanism was studied and analyzed in this paper. Using three-dimensional modeling software as computer-aided design (CAD) platform for a clock mechanism and MSC.ADAMS (rigid body dynamics simulation software) to simulate and analyze the dynamic characteristics of clock mechanism, rotation speed and rotation time was obtained and also the relationship between the rotation speed and rotation time. Simulation results show that the clock mechanism using centrifugal force as driving force has the time characteristics related to the rotation speed and meanwhile, more stable characteristics of distance.

Abstract: As we know, when using traditional particle system to initiate the natural phenomenon, we need to deal with a lot of computation and data issues, in order solve this problem, we discuses in this chapter to combine the way of particle system and visual particle system, using vertex buffer techniques and texture mapping techniques to design elementary particle systems, which base on Visual C++ as compiler platform. using the Direct3D graphics software library to complete particle system designing ,and it successfully simulated using a small amount of particles in the flame, smoke and other special effects which not only improved the Utilization of System resources ,but also Guaranteed the Verisimilitude and Real-time in the same time.

Abstract: Aim is designing the indexing rotation worktable, used for machine process indexing rotation. in this paper introduced two kind of working method of rotation worktable, indexing rotation and circle feeding. Particularly discuss structure compose, drive fashion, transmission mechanism ,orientation clamp mechanism, working principle, indexing rotation action course, about swing hydraulic motor indexing mechanism, rack piston hydraulic cylinder indexing mechanism and hydraulic cylinder Geneva wheel indexing mechanism. through analysis and compare, summarize advantage and disadvantage of the three mechanisms, supply reference for designing and selecting indexing mechanism. the new is used hydraulic cylinder Geneva wheel mechanism to indexing rotation worktable.

Abstract: The effects of homogenizing annealing process on the microstructures and properties of Mg-Gd-Y-Zr magnesium alloy were investigated and the fracture of specimens before and after homogenizing annealing was also analysized by optical microscopy，X-ray diffraction analysis etc．The results show that after homogenizing annealing，dendritic segregation is almost eliminated and the microstructures and properties of alloy are improved. The annealing temperature played a main role in homogenizing of Mg-Gd-Y-Zr alloy. The optimal homogenizing annealing process is at 480°C for 8h．

Abstract: In order to research the effect of different cutting orders on breaking mechanism of TBM cutters for the rock without joints, this paper established the simulation models of breaking rock three TBM cutters in simultaneous and sequential orders, which is based on the 2D discrete element method. A series of numerical experiments were designed and the whole process of production and propagation of crack and rock breaking was successfully simulated. The simulation results showed that the cutter order determines the breaking mode, which is carefully analyzed: The chipping stress under the sequential order is higher than simultaneous way. The chips are formed by the side cracks under the two loading modes, while the shape of the rock chip are different. The distribution of the principal stress contour is almost symmetrical in different cutting order. Finally, conclusions and future work are summarized.

Abstract: The Key of Web Services lies in how to describe and find Web serve, and which is mainly realized depending on UDDI technology is realized. The company which provided the services by UDDI can register information, it can make the potential user and/or cooperative partner find the services and simple shelf of the business of these companies. At the same time, UDDI can make company find other company, so as to expand the potential business partnership. We can say UDDI has offered the chance for company to step into new market and service, also make the companies in all scales expand their own place business among the global market rapidly.

Abstract: With the rapid development of the Internet and information, communication technology, human society began to enter into the intelligence community with the digital and network platform. With the popularization of computer application in schools, enterprises and other institutions, the meetings of governments, enterprises and institutions has broken the traditional model that the meetings are held in the same place and at the same time, and network meetings is to be popularized with the increasingly fast paces. But regardless of the company or the university, there exists the problems of meeting management. Now the overwhelming majority of the conference management is still in a state of manual, inefficient and prone to error, not manageable, not rule out any untrue phenomenon. Therefore, the internal management, self-improvement of the meeting management can not be ignored. This paper aims to resolve this problem by designing a meeting management website. Conference Management website ASP can be used to design the conference management website, ASP (Active Server Pages) dynamic website is a technology which is introduced by Microsoft Company to replace CGI (Common Gateway Interface)-a common Gateway Interface. By combining the knowledge of ASP HTML language, ASP directives and ActiveX components and Access database, the paper uses the own Web server to create and run a dynamic interactive Website 。The paper aims to realize the work of meeting managing, application, auditing, controlling, minutes of meetings processing through the meeting management website.

Abstract: CFD method is used to simulate characteristics of flow field inner a kind of wave-plate gas-liquid separator with drainage channels. The N-S equations closed with standard turbulence model is used. The resistance characteristic of separators with different vane clearances is acquired as function of inlet velocity and the flow fields are simulated numerically. In order to evaluate the simulation method, model experiment is carried on using wind-tunnel to obtain the resistance characteristic under the same operation condition. Good agreement is reached between numerical results and experimental data of pressure drop of the separator. The research can provide theoretic basis for the design and optimization of wave-plate gas-liquid separator in the future.

Abstract: Based on many experiments of CO2 laser welding of high strength two-sided galvanized steel thick with 1.5mm to vehicle body, joint microstructure and stress-strain curves of specimen are acquired. It has inferred theoretically relations among critical power, welding speed and focal point position under given welding technological conditions. With coaxial and side-blown protective gas, craft parameter are optimized, the laser deep melt welding may avoid effectively heat-affected zone (HAZ) softened phenomenon, as well as welded porosity may controlled effectively. The experimental result shows that hardness value in weld zone becomes low with increasing of energy input, at the same time the cracked zone of tensile specimen, the dimple size and the distribution of cross-section in welding seam are also different, tensile crack of welding seam extends to the base metal, which indicates deep penetration laser welding can effectively avoid softening of welding joints during laser welding of high strength galvanized steel.