放電加工即時專家系統雛型之研製

Abstract

放電加工是藉電極與工作物間產生的放電現象進行加工，其工作速率並不是相當高，但放電加工可利用適當的電極對超硬合金材料作加工，所以有愈來愈普遍的趨勢。但因各種材料的配合必須給予不同的放電參數才能達到一定的工作效率，使得這方面成為一專門的學問，如何提供加工設定的資訊與即時控制整個放電流程，便是論文中探討的重點。 本文採用模糊控制理論，配合專家知識與操作經驗獲取控制法則，將計算出之各個控制量存放資料庫中，使系統能即時調整放電間隙。同時根據資料需求設計放電實驗，並以實驗資料探討各種愛因對加工的影響，以作為加工參數選取的參考。另外設計友善的使用者介面，使操作人員可方便的輸入加工資料、獲得資訊。最後控制整個放電流程，依據放電加工狀況做即時的調整，使其能順利約加工至設定的深度。 由於間隙控制法則的建立，使本系統可以相當高的效率來進行加工。而資料庫的建立與使用者介面的設計，可大大減少操作人員的負擔。根據放電情況讓系統做即時的反應可增進整體的加工速度。希望我們所做的努力能對放電加工機業有所貢獻。

EDM is a machining process by means of teh electrical discharging belween electrode and workpiece. It has lower machining speed, but it can process extremely hard alloy with pecper electrode, thus, it gets mere and more popular, Hewever, in order to get higher working efficiency, we have to give *wischange parawevers for different material, that is an expert knowledge. In this thesis, how to provide the information for process setting and how to control the discharge process in real time are the major points to be described. The authors have applied fuzzy control theory combined the control rules induced from expert knowledge with operating experience, stored the calculated control actions in the database, such that, the system can adjust the discharge gap in real time, 0f the same time, we have designed experiments in accordance to the reguired data and discussed the influence of each factor according to experiment data. These analyses will be helpful to the choice of machining parameters for operator. Besides, we have designed complement user interfaces such that the operator can easily input data and obtain information. Finally, we have achieved the discharge procedure control in which real-time adjustment is taken according to the state of teh discharge process such that the whole process will be successful. The system can process with high efficiency by establishing gap conrol rule. THe establishment of database and user interface can reduce the load of operator. Let the system doing real-time respose according to the state of discharge will improve the whole machining efficiency. We hope the effort in the thesis will make a contribution to EDM.