Transmission Precision Analysis And Design Of C-axis Dividing Device Of The Heavy Mechine Tool Worktable

The C-axis dividing device of heavy machine worktable is the key mechanism of its dividing movement, whose transmission accuracy affects the machining precision of parts directly. In the design of this dividing device, designer always choose the dimension and accuracy of the gears in the transmission system by their experience, conservatively, which lead to over-precision, larger dimension and finally, more expensive. And to solve this question, a model of the C-axis dividing device transmission error is established in this paper, and the optimal design and accuracy designation method is also explored.For the five kinds of C-axis dividing device in heavy machine, an analysis of the mechanical structure and the anti-backlash theory is presented, then based on this analysis and the costing problem in practice, five C-axis structures choose principle are put forward. At the same time, to the implementation principle and debugging problems of the Backlash against two motor in Siemens 840 D NC system, a further research was made.Based on the analysis of the C-axis transmission accuracy, the error mode of the transmission system was established; and based on the dynamic analysis of the C-axis worktable driven by two servo motors, the mechatronic model of C-axis worktable was established; adding the error model to the mechatronic model, a simulation of the static and dynamic error of the worktable was made and its result was analyzed. And the static error of worktable was verified by experiment.The optimal design and accuracy designation of the transmission system in C-axis dividing device was made. With the error analysis of the transmission in heavy machine worktable, a precision function of C-axis dividing device in heavy machine was put forward。Besides, in additional consideration of the volume and stress target function, a simultaneous optimal design was proceeded. The design result and present design was compared and it shows that, the optimal design improve the C-axis volume and stress obviously. At the same time, considering the optimal result of the two motor C-axis transmission, expense, robustness and balance, this paper give the advice to the manufacturing and assembling of the C-axis transmission. This paper also analyze the sensitivity of the precision designation.