Advanced Materials Research Vols. 753-755

Abstract: Aiming at the precision retaining ability problems of the precision ball screw, the modeling on the motion precision loss process under load condition is studied. The mechanics and deformation of the interface of ball and groove under load condition is analyzed by using the classical mechanics and Hertz contact theory, also a precision loss model for precision ball screw is established based on the dynamic characteristics analysis of the ball screw. Regardless of the external interference, the impact of various factors on the precision loss is analyzed and calculated.

Abstract: The R&D of complex product has characteristics like complex structure, high reliability requirements, long cycle, big investments, and high degree of coordination among subjects. Base on this and from hierarchical model and function model, the paper put forward a networking synergy collaborative work platform oriented to different stages, different goals and different users and integrated with individuation and diversification. From the Angle of hierarchical model, the platform is divided into base layer, service layer, application layer, presentation layer,user layer and extension layer six layers. From the Angle of function model, the platform includes the product data management system, product technology aided design system, intellectual equity management system, project management system and aided analysis software five systems. This platform can be applied to complex product dynamic alliance networked R&D, shorten the product development cycle, and improve the work efficiency.

Abstract: Because traditional dynamic analysis for linkage mechanism would be on the basis of some assumptions such as driving forces, which may lead to impractical results for certain linkage mechanism. Therefore, the assumption about driving forces will be dismissed in the article during dynamic analysis for feed mechanism of cold forging machine, and the method of sequence solution is also introduced to replace matrix method for dynamic functions. In this case, the results would be practical and reliable for further theoretical analysis.

Abstract: The jaw crusher run in high speed and heavy load, high requirements for the working device performance. This paper analyse the gap between the eccentric shaft and movable jaw. Firstly, jaw crusher establish geometric model, the kinematic pair clearance two state model theory, establish the clearance contact model and the clearance friction model, based on the ADAMS software, establish the gap with the working device in the jaw crusher models. The jaw of the velocity and acceleration and the eccentric shaft and the movable jaw contact force dynamic characteristics analysis of gap is not at the same time, analysis of the results showed that gap has great influence on the dynamic characteristics of mechanism.

Abstract: To meet the special needs of the bolting and shotcreting work environment of coal mine, a new pneumatic spring-piston mechanism was designed. The derivation process of the pressure loss equation was described based on S.Morinaga formula. The concrete pumping machanism kinetic model was constructed and analysed using Lagranges Equation. The work of this paper lays a theoretical foundation for optimization design of wet spraying machine system.

Abstract: Aiming at the vibration problems in Anshan Iron 5500mm heavy plate mill production line, the mill frame vibration in the main parts is researched by using the computer aided design method and the analytical method. Using SolidWorks 3D design software for frame modeling, the model is imported into the ANSYS finite element software, then 5500mm heavy plate mill stand 12 order natural frequencies and natural vibration type is calculated; applying analytical method of the 12th band of vertical vibration the natural frequency is calculated, and the finite element results is analysed comparatively. This paper lays the foundation for the study of the vibration of the mill stand in the future, provides a theoretical basis for the dynamic design of the mill stand.

Abstract: The dynamic response of elastic half space including semi-cylindrical lining hill while bearing out-of-plane harmonic line source loading on horizontal interface is investigated using the method of complex function and Greens function. the displacement function of incidence wave is given while a out-of-plane harmonic line source is loaded on arbitrary point of horizontal interface;and the solution domain is divided into two domains, an elastic half space with the semi-circular canyon and a cylindrical lining; the scattering wave of semi-cylindrical canyon and the standing wave of cylindrical lining are constructed. Finally, it conjoins the two domains, and a series of infinite algebraic equations can be obtained to settle this problem. In the end, the numerical expressions of the ground motion in the horizontal surface are discussed.

Abstract: As a new type of gear transmission, the gear transmission with meshed medium belt has advantages of reducing vibration noise and friction damage on the gear surface. During the process of the gear transmission with meshed medium belt, the friction and wear is mainly occurred on the medium belt, so the service life of the medium belt has a direct effect on the performance and efficiency of the transmission system. The friction and wear mechanism of the medium belt is researched and effective ways to prolong the service life of the medium belt are given in this paper.

Abstract: Double involute gear drive was a new type of gear drive, which had high bending strength, small vibration and low noise. In this paper, the lubrication characteristics of the new type of gear had been studied, the model of elastohydrodynamic lubrication had been simplified and analyzed by geometric, and the mathematical model used for numerical analysis of elastohydrodynamic lubrication had been established.

Abstract: In this paper, the vibration of a three screw pump was studied. Firstly the vibration response of the pump was tested. Then the FE model of the pump was constructed and the modals of it were calculated. The exactness of the result was confirmed by the testing modals and the reasonable of the FE model was verified at the same time. Finally, the force acted on rotors due to pressure was calculated by the mathematical method of surface integral. The force was loaded on the FE model and the force response was predicted, which represented the basic vibration of the screw pump. Based on the work above, the vibration spectrum of the screw pump was analyzed.