Abstract:

In order to investigate the effects of mechanical structure on the transverse motion error of guide bar shogging system, firstly, the transverse motion error was obtained by the rigid-flexible coupling dynamic model by Ansys and ADAMS software, considering the axial stiffness of ball screw, the axial and radial stiffness of angular contact ball bearings, the radial stiffness of linear bearings and guide bushings calculated by Hertz contact theory, and the flexibility of the guide bar, spherical hindge and special shape connection. Then, the effects of the mass and stiffness on the transverse motion errors of the guide bar shogging systems driven with the reinforcement and driven by the center of gravity were investigated. The results show that the transverse motion errors are produced mainly by the bending deformation of guide bar and the special shape connection caused by deflection moment and the compressive deformation of the guide bar and the spherical hinge caused by axial thrust, and the transverse motion error can be reduced by decreasing the mass and increasing the stiffness of the guide bar. Driven by the center of gravity can reduce the deflection moment, thereby reduce the requirement of the stiffness of the guide bar.

Key words: qarp knitting machine, guide bar shogging, transverse motion error, Hertz contact theory, rigid-flexible dynamic model