基于CATIA系统的复杂零件建模倒角设计方法探索

Research on Chamfer Design Method of Complicated Part Modeling Based on CATIA System

CATIA V5系统是当前中国飞机制造企业中最常用的设计和生产软件,对于飞机大多数壁板零件的加工,首先需要对其建立三维展开数学模型,再进行数控铣削,最后弯曲成形。在弯曲成形过程中,筋条与腹板通常通过倒角过渡,避免因应力集中所导致成形时壁板的破裂。由于飞机曲面结构一般比较复杂,存在很多倒角无法成功的问题。为防止弯曲成型所导致的零件损坏,本文提出了3种方法来解决倒角问题,即"装配修剪法"、"误差圆化倒角法"、"负实体倒角法"。

CATIA V5 system is a design and production software which is the most commonly used in current aircraft manufacturing enterprise in China.For processing the most wing-skinpanel components,a three dimensional mathematical model is needed to establish first;and then numerical control milling is followed;the bending forming is necessary at last.In the process of bending forming,fillet sand webs are usually made the transition by chamfering.In this way,it can avoid the stress concentration caused by forming wall rupture.Due to the complexity of aircraft surface structure,many issues cannot be solved by chamfering.In order to prevent the damage caused by bending forming parts,three methods are put forward to solve the problem of chamfering,those are method of cutting and assemble','error round chamfer method',method of chamfer by negative part.