Papers by Author: X. Chen

Abstract: In this paper, based on some disciplinarians about the configuration design of Parallel Robot Mechanisms (PRM), the theory bases was established for parallel structural configuration design by developing different types of the partly degrees of freedom (DOF) parallel configuration designs. The new method to synthesize the partly DOF parallel mechanisms, called constraint accession, is provided to the classification of kinematical chains by use of screw theory. The active kinematical chains control the necessary DOF and the passive kinematical chains control the needless ones. In this paper, the relevant active and passive kinematical chains are put forward and the constraint chains are classified in detail. It is demonstrated by an example that new configurations can be obtained by assembling different kinematical limbs.

Abstract: In this paper the basic principle for the free curved surface NC grinding is introduced, and then the influencing factor of envelope control track, the key question of free curved surface NC grinding, is analyzed. Finally, in this foundation, according to the principle of “minimum directed distance” the thought of the free curved surface NC grinding control track calculating method is put forward.