基于时序分析的凸轮廓型曲线拟合研究

以凸轮轴仿形磨床为研究对象 ,建立了以凸轮靠模升程作为输入、工件升程作为输出的磨床加工系统二阶定常线性自回归数学模型。基于此数学模型 ,提出了凸轮靠模廓型计算的新方法 。

直驱式自定心中心架的设计与仿真分析

自定心中心架用于细长轴类工件(尤其是丝杠、螺杆等工件)机械加工时进行辅助支承,其夹持工件的定心精度直接影响零件本身的加工精度。文中介绍了一种直驱式自定心中心架的设计过程,建立了自定心中心架精确几何模型,给出了片状凸轮的结构及凸轮廓型的精确计算过程,设计了一种自定心中心架定位精度的验算方法,利用三维软件建立了自定心中心架的结构模型,仿真了夹持不同直径工件时定位精度,验证了自定心中心架的设计和凸轮廓型计算的准确性,为高精度自定心中心架的设计提供了理论依据。

自定心中心架的力学分析与仿真

自定心中心架用于轴类工件尤其是丝杠、螺杆等工件机械加工时进行辅助支承,其夹持工件的定心精度直接影响零件本身的加工精度。为了实现中心架的参数化设计,以MATLAB、UG和ANSYS软件为平台,利用参数化设计方法和虚拟样机技术,在UG中建立中心架的参数化模型并将摆杆导入到ANSYS中进行有限元分析,为中心架结构拓扑优化奠定基础。

Improving cam profile design optimization based on classical splines and dynamic model

Cam profiles play an important part in the performance of cam mechanisms. Syntheses of cam profile designs and dynamics of cam designs are studied at first. Then, a cam profile design optimization model based on the six order classical spline and single DOF(degree of freedom) dynamic model of single-dwell cam mechanisms is developed. And dynamic constraints such as jumps and vibrations of followers are considered. This optimization model, with many advantages such as universalities of applications, conveniences to operations and good performances in improving kinematic and dynamic properties of cam mechanisms, is good except for the discontinuity of jerks at the end knots of cam profiles which will cause vibrations of cam systems. However, the optimization is improved by combining the six order classical spline with general polynomial spline which is the so-called "trade-offs". Finally, improved optimization is proven to have a better performance in designing cam profiles.