摘要
复杂产品加工的高精度导致了其加工过程的多工序性。当复杂产品在多个工序间进行加工时,其加工误差会在工件上传递并累加。由于其高精度要求,导致引起几何加工误差的过程参数较之一般的多工序加工过程来说更多,误差产生的形式更多样,为了对复杂产品加工误差传递过程进行描述,采用机器人运动学中的微分运动矢量来描述工件和夹具,采用齐次坐标变换来得到其在不同工序间的位置关系。在此基础上,建立了复杂产品加工过程误差传递的物理模型,详细论述了该模型的建立过程,并对所建模型的有效性进行了验证。该模型为复杂产品质量控制与改进研究中的故障诊断、误差源识别、传感器安放位置优化、误差仿真和加工参数及夹具优化设计等提供了理论基础。
The high precision request of complex product machining results in that it＇s machining process often contains multiple stages.When the part transmits between multiple stages,dimensional variation of part will be accumulated and transformed between the machining processes.Because of its high precision requirements,there are more process parameters will impact the machining errors than general multistage process,there are more diverse process parameters should be considered in complex product machining process.In order to describe the process of machining variation propagation,the part and fixture were described by differential motion vector based on the kinematics principle of robot,the changes of theirs space pose were obtained by homogeneous transformation,and then a state space modeling of the variation propagation in the multistage machining process was established.The derivation of the model is presented.The effectiveness of the model is validated by a real case study.This model has great potential to be applied in the fault diagnosis,root cause identification of variation,sensor placement optimization,variation simulation,machining parameter and fixture design and optimization in the quality control and improvement of complex product.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第8期123-128,共6页
Journal of Wuhan University of Technology
基金
国家留学基金委项目(CSC2009103811)
国家自然科学基金(70931002)
关键词
复杂产品
加工过程
齐次坐标变换
误差传递
状态空间模型
complex product
machining process
homogeneous transformation
variation propagation
state space modeling
