Construction of DCES Expert System For Die Casting Defects and Their Countermeasure
Lü Hong · 2001
The construction of an expert system for the die casting defects analysis and their corrective countermeasures are introduced. On the basis of gathering the field knowledge, the common die casting defects, their causes and corrective countermeasures occurring during die casting process are summarized, and their logical relationship is established. The defects are divided into three basic categories covering geometric defects, surface defects and internal defects. The first procedure for solving a defect is to identify defect, then relative coefficient and parameters being used are checked to determine the real causes for a particular defect. At the third step, corrective suggestions are given with corrective sequence and corrective quantity. Three sub knowledge bases are employed to store field knowledge such as defect diagnosis, corrective countermeasures and recommended process conditions for different alloys and different die castings. According to the characteristic of the field knowledge, production rule, frame and procedure are used as knowledge representation scheme. Forward chaining and fuzzy inference as well as priority value inference mechanisms are introduced to solve the die casting defects. The system simulates the resolution technique employed by human expert in eliminating or reducing die casting defects.