| The paper has begun with existing driving mechanism of horizontal barrel finishing equipment and analysed the reason that creates the family of crank parts machining quality problem. The transmission plan of noncircular gears connect crank-slider mechanism has been presented and mathematical model of driving mechanism has been established. By way of programming operation, simulation analysis and parameter optimization, the feasibility of new plan has been proofed. Transmission and machining dynamic simulation of noncircular gears has been further proofed the feasibility of new transmission plan. By means of establishing mathematical model of noncircular gears driving mechanism and simulating mechanism motion state by using computer animated drawings technique, transmission feasibility has been examined. Mathematical model of shaping noncircular gears has been deduced. Noncircular gear machining simulation has been realized in condition of variational multi-parameter by programming. Feasibility of machining noncircular gear can be judged through simulation outcome and theory foundation for practical manufacture has been provided.
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