基于UG二次开发的渐开线花键轴参数化建模

Parametric 3D Modeling of Involute Splined Shaft Based on UG Secondary Development

渐开线花键轴作为一种重要的传动部件,被广泛用作较大载荷和对定心精度要求较高的机械传动结构。而在花键轴的设计过程中,需要进行多次强度校核和尺寸修改,琐碎、重复的建模极大地影响了设计效率。因此本文采用参数化设计方法,基于商用CAD软件UG的二次开发功能,结合MFC,编写客户化菜单和对话框,实现渐开线花键轴的快速建模以供实际工程设计需求。参考渐开线齿轮的加工的过程,先建立轴的模型,再生成渐开线齿廓,最后进行布尔差操作模拟切削加工,得到完整渐开线花键轴三维实体模型,并可生成不同齿廓的模型,能进行多次参数变动后的渐开线花键轴快速建模,满足实际工程优化设计中反复修改模型的需要。本文的工作展示了参数化设计的有效性和高效率,且在花键轴的实际设计过程中有一定参考价值。

The involute spline shaft is widely used in mechanical structure which is bearing a heavy load and requiring high precision of centering accuracy on account of its prominent advantages as an important part of torque and motion transmission.In the design of an involute spline shaft,a balance should be struck between strength checking and dimension modifying,thus leading to great repetitive modeling work,which reduces the efficiency of the design.Thus,based on secondary development of commercial CAD software UG,combined with MFC,a customized menu and a dialog in accordance with parametric modeling method were built,to meet the demand of quick modification of involute spline shaft.Referring to the manufacturing process of the involute gear,we model the shaft first,then involute tooth profiles,finally get the aimed involute spline shaft 3-D solid model through subtract-bool operation.Besides,series of spline shafts can be modeled and quick modified,satisfying the needs of repetitive modeling work of optimal designs.This paper demonstrates the high efficiency and effectiveness of parametric modeling method,provides certain instructions for the spline shaft designing as well.