关键词: 装配质量, 面向对像Petri网, 知识规则, 机械产品

Abstract: To solve the logic modeling problem for the formation process of complex mechanical products'assembly quality, assembly area was decomposed into several workstations from the perspective of the formation process of assembly quality, and every workstation was taken as the basic assembly unit to abstract and encapsulate. According to the logical relationships among the workstations, the message transmission network of the whole assembly system was determined, and an Assembly Quality Data Chain based on Object-Oriented Petri Nets (AQDC-OPN) was built to describe the transition and fusion of various kinds of quality characteristics in the assembly process. To promote the ability of autonomy and decision-making, the knowledge rules were adopted. Based on the accumulation law of assembly error, the current quality control points were optimized dynamically which considering of the upstream instantiated quality data, thus the online former feed-forward control of assembly quality and dynamic compensation of error accumulation were achieved. The assembly process of final drive was given to demonstrate the feasibility and effectiveness of the proposed model.

Key words: assembly quality, object-oriented Petri nets, knowledge rules, mechanical products