【作者】 刘栋；

【导师】 张义民；

【作者基本信息】 东北大学 ， 机械设计及理论， 2011， 硕士

【摘要】 动力伺服刀架是数控刀架中比较先进的一种,动力伺服刀架的性能将直接影响整台数控机床的性能。动力伺服刀架转位系统是动力伺服刀架工作的核心系统,因此,研究动力伺服刀架转位系统的可靠性对动力伺服刀架的研究有重要意义。本文对动力伺服刀架转位系统转位角度可靠性进行了研究。计算了转位角度可靠度,进行了基于可靠度的灵敏度分析。在可靠度的基础上,进行了可靠性优化设计；在灵敏度的基础上,做了可靠性稳健设计。具体内容如下：首先,将Pro/E3.0三维建模软件和ADAMS动力学仿真软件相结合,进行齿轮啮合的精确运动仿真,通过Pro/E3.0二次开发,实现基于标准渐开线方程和过度曲线方程的齿轮精确参数化建模,基于多体动力学的接触碰撞算法,利用ADAMS软件实现了齿轮啮合的运动学精确仿真。其次,考虑齿轮装配时由于装配误差引起的中心距偏差对转位角度的影响。以各齿轮中心坐标为设计参数,通过iSIGHT进行过程集成,进行仿真模拟并计算出参数随机变化情况下的转位角度。然后用神经网络技术对得出的数据进行拟合,拟合出转位角度的显式方程。再次,运用一次二阶矩法、四阶矩法和Monte Carlo法计算动力伺服刀架转位系统转位角度的可靠度,分析了各设计参数对可靠度产生的影响。基于可靠性优化理论,以转位角度实际值与理论值偏差最小为目标函数,对动力伺服刀架转位系统进行了可靠性优化设计。基于灵敏度和稳健设计的基本理论,以灵敏度最小,即最稳健为目标,对动力伺服刀架转位系统进行了可靠性稳健设计。最后,基于计算结果分析了各设计变量对可靠度的影响,得出了基于可靠度的可靠性优化设计方案和基于灵敏度的可靠性稳健设计方案,对产品设计有一定的指导意义。展望了动力伺服刀架转位系统可靠性研究过程中需要进一步解决的问题。更多还原

【Abstract】 Power servo turret is one of the most advanced CNC turrets. Power servo turret’s performance will directly affect the performance of the entire CNC machine tools. Power servo turret translocation system is the core of the power servo turret System. Therefore, study translocation system reliability of the power servo turret is important.This thesis studied reliability on translocation system of power servo turret. Calculated the angle’s reliability and conducted a sensitivity analysis based on reliability. Optimal design is made based on the reliability. Robust design is made based on the sensitivity. Details are as follows:First of all, combining three-dimensional modeling software Pro/E3.0with dynamic simulation software ADAMS, accurate motion simulation of meshing gears is made. Secondary development by Pro/E3.0, standard-based involute curve equation and accurate parametric modeling of gear are made out. Based on the contact and impact algorithm of multibody dynamics, ADAMS software is used to do the kinematic precision simulation.Then, considering the gear assembly, the center deviation caused by the assembly error affects the angle. The design parameters are the centers of the gears. Conducted by iSIGHT process integration, simulated and calculated the different parameters of the translocation point. Then the neural network is used to fit data and the explicit function is made out.What’s more, first order second moment method, fourth-order moment method and the Monte Carlo method is used to calculate power servo turret translocation system reliability, and analyzed the influence of the designed parameters to reliability. Based on reliability optimization theory, the objective is minimizing the deviation between angle actual value and the theoretical value. The reliability optimization design of power servo tutter transposition system is made. Based on the basic theory of sensitivity and robust design, with the objective of minimizing the sensitivity, the reliability-based robust design of power servo tutter transposition system is made.Finally, Based on the results analyzed the influence of the designed parameters. The program based on reliability optimization design and the program based on reliability-based robust design is made out. The problems for further study on the reliability of power servo tutter transposition system are discussed.更多还原