On the Development of Expert System for Turning Operation

介绍了用于选择最佳切削条件的专家系统的开发、系统结构和基本功能。通过问卷调查，首先考察了专家刀具工程师获取最佳切削条件的思维方式。在该系统中，由于发现框架结构与工具工程师的知识结构相似，因此采用框架结构进行知识表示和推理，从而使系统具有与工具工程师思维方式相同的功能。该系统最重要的功能是对颤振、刀具磨损过大、表面粗糙等加工故障进行预测和解决。根据故障类型的不同，采用了两种不同的方法，即借助评价函数检索数据法和基于金属切削理论算法的解析法。开发了数据库自充实和知识学习功能，提高了系统的性能。进一步开发了向用户解释推理过程的功能。将所开发的专家系统应用于多项车削加工中，对加工故障的预测和初始加工条件的确定具有较好的效果。

On the development of an expert system for selecting the optimum cutting conditions, system architecture and fundamental functions are examined. The way of thinking of expert tool engineers for obtaining the optimum cutting conditions was first examined through a questionary investigation. In the system the frame construction was used for knowledge representation and inference because it was found to be similar to tool engineers' knowledge architecture.The system was then constructed so as to possess the same functions as those in their way of thinking. The most important functions of the system are the prediction and the resolution of machining troubles such as chatter vibration, excessive tool wear and rough surface finish. Two different approaches are taken depending upon the kind of the troubles, which are retrieving data method with aid of the evaluating functions and analytical method through the algorithm of the metal cutting theories. The functions for self-enrichment of database and learning of knowledge were developed in order to improve the system ability. The function which explains the process of inference to user further developed. The expert system developed was applied to the several turning operations and it proved to be effective in the prediction of machining troubles and the decision of initial cutting conditions.