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Thispaperpresentsanmm•ysisresu•t•fthree-dimensi•na•meshing•fcr•wngearc•up•ing(CGC).Mathematic models of the surfaces of crown gear and internal gear are established. The equation of internal gear surface is given. The equation of conjugate surface of crown gear is solved accordin, g to the principle of gearing, and that of non-conjugate crown gear is derived with crown curve of a circular arc. The meshing state of conjugate and non-conjugate surfaces is analyzed through computation of contact lines and points. It is concluded that the meshin~ of conjugate CGC is line-contact, there are several paim of teeth engage simultaneottsly, and non-coqjugate CGC has point-contact condition of meshing and only 2 pairs of teeth engage in theory.

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A suction casting process for fabricating Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass microcomponent using silicon micromold has been studied. A complicated BMG microgear with 50 m in module has been cast successfully. Observed by scanning electron microscopy and laser scanning confocal microscopy, we find that the cast microgear duplicates the silicon micromold including the microstructure on the surface. The amorphous state of the microgear is confirmed by transmission election microscopy. The nanoindentation hardness and elasticity modulus of the microgear reach 6.5 GPa and 94.5 GPa. The simulation and experimental results prove that the suction casting process with the silicon micromold is a promising one-step method to fabricate bulk metallic glass microcomponents with high performance for applications in microelectromechanical system.

The main structure of the multifunctional loading and unloading machine is analyzed and designed, including feeding conveyor, intermediate conveyor and unloading conveyor. According to the action of each part of the hydraulic system and electrical system design, in order to meet the needs of more working conditions, the working mechanism realized the overall slip, telescopic conveyor lifting, rotating, telescopic; Combined with the convenience of worker operation, three control modes of remote control, workbench control and terminal control are designed.