基于制造资源能力的装夹工艺分层设计技术

为发展创成式的计算机辅助工艺设计,研究了计算机辅助工艺设计系统中工件装夹规划的自动生成算法.基于扩展有向图,建立了零件的公差信息和基准-加工特征关系的数学表示模型,基于公差分析和制造资源能力模型,建立了从单件层到多件层的工件装夹工艺生产算法.该数学模型和算法可自动识别工件的加工特征、装夹基准,并根据制造资源能力和公差分析对装夹进行优化分组,实现装夹分组对工件加工精度的影响最小化,进而生成装夹规程.最后以实例证明了该方法的可行性.

Layered design of manufacturing setup planning based on manufacturing resources capability

To develop generative Computer Aided Process Planning(CAPP),automatic generation of manufacturing setup planning in CAPP was studied.Based on the extended directed graphics,the mathematical model to describe the tolerance information as well as datum-machining feature relationship was constructed.Algorithm to automatically generate setup planning was established by means of tolerance analysis and manufacturing resources capability model.This algorithm could identify the machining features and datum to optimize setup groups based on the manufacturing resources capability and tolerance analysis.It also minimized the influence of the locating error stack-up on the machining quality.Finally,a case study of setup planning was presented to verify the feasibility of the method.