Abstract: Computer aid design (CAD) system based on the optimization design process of double-toggle clamping unit was developed and its design performance was emphasized. Through the analysis of kinematics simulation and deformation simulation, the design result was verified rationality. By comparing with the existing same specifications mechanism though the experiment, the designed structure by the system was proven reasonable, and had good performance. All study showed that the CAD system could optimize and design different series clamping unit efficiently.

Key words: injection molding machine, double-toggle clamping unit, optimization design, computer aid design system