Advanced Materials Research Vols. 308-310

Abstract: In order to find a simple way to prepare oriental HA, only by controlling the preparation conditions, a co-precipitation method was used to prepare an oriented HA. The influences of temperature and aging on its directional growth were investigated kinetically and thermodynamically. The chemical composition was characterized by X-Ray diffraction and Fourier transform infrared. The morphologies were observed by scanning electron microscopy (SEM). The oriented parameters of HA (c/a) were calculated by Scherrer equation. The results show that the temperature rise in the process of synthesis, aging or calcining inhibited the growth of HA crystal in the direction of c-axis. Aging for 24 h benefited the growth along c-axis, whereas aging for 36 h was in favor of the decreasing of the c/a value. The supernatant-replacement during aging exerted the same effect on the growth with the rising of temperature. The SEM analysis result shows that the morphology of the produced HA particles looked like a uniform needle shape and had a good dispersion.

Abstract: The paper introduces voltage space vector pulse wide modulation (SVPWM) arithmetic and the field oriented control (FOC), develops a suit of Digital Controlled frequency-variable speed-adjustable system based on digital signal processor (DSP) TMS320LF2407 of TI company For motor control, and research and analyze design parts of the system, presents the instantiation application result. The experimental results indicate: the laboratorial setting has a simpler hardware construction, less output current harmonics distortion, higher control precision and stronger real-time sigal processing.

Abstract: A combined mechanism, which cycloid tooth profile planetary mechanism and screw mechanism are connected in series, can convert the input-component’s high-speed rotary motion to output-component’s low-speed reciprocating linear motion. Base on that mechanism, a linear drivers was developed. And it is composed by electric motor, eccentric shaft, cycloid-plate, screw & nut, and so on. Because an intermediate transmission mode used rolling-body is applied in the contact surfaces among the kinematic pairs, the drivers’ stability and transmission efficiency are enhanced through improving kinematic pairs’ friction state and reducing parts abrasion. In the paper, it is emphasis discussed that the kinematics and main parameters’ computational method for cycloid tooth profile planetary mechanism.

Abstract: In order to meet the design requirements, the wet shifting clutch was designed based on secondary development of Pro/E. The basic principle of parametric design and the system composition of Pro/Toolkit application program were introduced. The three-dimensional template of wet shifting clutch was established. The VC++6.0 programming platform was utilized. The application program interface was set up by using the synchronous mode of Pro/Toolkit. The regeneration of wet shifting clutch was completed. The parametric design about the key sizes in the key parts and assembly relationship of the wet shifting clutch were realized. The convenient design of wet shifting clutch was achieved. The effective method could be provided for the parametric design of other complex parts.

Abstract: MASTA is the professional CAE software for auto transmission simulation, analysis and design system. Based on this, firstly how to realize the design and optimization of auto transmission assembly is discussed by MASTA system deflection analysis principle, not only are the accuracy of gear strength and modification analyzed through comparison, but also the selection and rating basis of axis and bearing are obtained. In addition, on basis of the full consideration of the whole structure deflection namely the structural flexibility factor, the influence of the housing and alien shafts’ actual rigidity on internal driving system is checked, and the analysis results of gear strength are presented. A new design concept is put forward, which improves design level of gearbox, and reduces the testing time and shortens the product development cycles as well.

Abstract: The dynamic model of multi-rigid-body system and rigid-flexible coupling system of 2K-V cycloid pin gear reducer are constructed with ADAMS, the output-angle error curves are obtained by multi-body system dynamic simulation, and the influence of elastic deformation come from planet gear, cycloid gear and pin gears on the transmission accuracy are analyzed. The work this paper introduced provides a useful approach for further study on the dynamic transmission accuracy of precision gear drive system, exploration of active control technology for the transmission accuracy and improvement of structural design for the gearing.

Abstract: When the internal cylindrical cavity die is processed on traditional milling machine, such defects as interference between the disc milling cutter and die, low efficiency as well as poor shape accuracy often exists. This paper describes a new manufacturing method, in which the compound motion theory is applied by means of combining rotary motion of cutters with the horizontal movement of the work-piece. As result the internal cylindrical cavity die can be manufactured very accurately, not only improving production efficiency but also ensuring the accuracy of the cylindrical cavity.

Abstract: In the planetary gear transmission design, the structure and shape of some major parts are often the same or similar, tedious and duplicate drawing may reduce the drawing efficiency. This paper studies redevelopment technology by using Visual Lisp language in AutoCAD platform, and compiles drawing programs to realize parametric drawing. The new graph can be generated automatically by a computer by modifying simply a few parameters in the drawing process.

Abstract: In order to validate the pin-hole-output mechanism of FA cycloid drive force analysis theory, and based on the study on the basis of the contact problem, this article used the international advanced finite element analysis software ANSYS, established the output dowel pin and cycloid gear pin hole's contacting finite element model, and analyzed the static three-dimensional contact analysis. The calculation results coincided with the proposed pin-hole-output mechanism with gap dynamic stress analysis method, proved the correctness of the stress analysis theory.

Abstract: In High precision FA type pin-cycloid gear transmission, carrying capacity has always been sacrificed by using one tooth differenced of "Arch Back Teeth Profile" to achieve high precision transmission. Compared with one tooth differenced transmission, two teeth differenced transmission can have more teeth meshing at the same time, namely can have better carrying capacity than one tooth differenced. In order to simultaneously satisfy high-precision transmission and high bearing capacity, this paper do a comparative study on two kinds of less teeth differenced FA pin-cycloidtransmission.Through theoretical analysis, programming one type model calculated two kinds of teeth differenced cases geometric relative rotated angle, the tooth surface contact force and contact stress. Then do a comparative study and analysisaccording to the calculated results.