| CNC gear shaper is moving in the development of high-speed, high-precision, high-efficiency, at the same time, a lot of problems are brought at the high-speed slotting, such as noise, vibration and impact, which will directly affect the performance of the machine tool. Therefore, it is of great significance to research the dynamic problems of CNC gear shaper.In this thesis, YK5132B Shaper Machine Tool will be studied. Based on the research of Helical cylindrical gear slotting machining principle and Shaper cutters additional rotation law of motion, the relevant theoretical formula is derived, and analysis main transmission mechanism of slotting machine from the dynamics.The main transmission mechanism of dynamic performance is directly related to achieved the shaping machine of high speed, high precision. So it is essential to do dynamic simulation analysis. This thesis firstly establishes a virtual prototype model for the main transmission mechanism, then completes the drive function of additional rotation of the motor combined with the library of ADAMS software, and gets dynamic simulation results of the main drive mechanism. The simulation results show that the traditional main transmission mechanism does not have the quick-return characteristics. Based on comparing characteristics of double crank slider mechanism with the crank slide block mechanism, this thesis selects the double crank slider mechanism to replace the traditional main drive mechanism.According to the new main transmission mechanism proposed in this thesis, dynamic simulation has been done. The results show that it has the advantage of quick-return characteristics; it will make the inertial force become larger of the high speed mechanism. Therefore, in order to solve this problem, this thesis carries out the optimization of the mechanism. To the shortage, the optimization design has been carried out in this thesis. According to the analytical method, the mathematical model of virtual prototype is established. By using the parametric design tools of ADAMS software, this thesis set up the parametric virtual prototype model, chooses the objective function to decrease the mechanism inertial force, then carries out sensitivity analysis, and chooses appropriate parameters according to the results of sensitivity analysis. The optimization design for the new-type main transmission mechanism has been finished by using the optimization algorithm provided by ADAMS software. The dynamic simulation has been carried on the results of optimization design, and compares with the simulation before optimization. The results show:the inertia force decreases a lot and the effect of optimization is obvious.The spindle box will bear complicated alternating load in the practical work, and its stiffness and vibration characteristics will directly impact on the main transmission mechanism reliability when working, therefore, the modal analysis on the spindle box is very necessary. This thesis chooses the modal analysis of the Block Lanczos algorithm to extract the first six order modal of the main body, and get the first six order natural frequency and vibration mode, which will provide the reliable theory for the further design and optimization of the spindle box. |
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