부산대학교 도서관

Plastic inject ion molding is a commonly used method for massive production of plastic products in the manufacturing industry, however, mold is necessary for the mold injection process of plastic. In the mold development process, the processing steps of its main part, mo ld core, include heat treatment, grinding machining, mil ling machining, wire cutting machining and Electrical Discharge Machining (EDM), which was named so because partial processing area needs to be finished by electrical discharge machining. Since e lectrical discharge machining is the final station, therefore, its rework cost due to wrong processing will, in addition to electrical discharge machining, also include the previously mentioned processes. Since the program editing and compensation value input in the electrical discharge machining were mainly operated by personnel, therefore, abnormal machining counts cannot be effectively reduced or totally released, and the setup time of work piece cannot reduced either. As the mold development need and maintenance increases constantly, excessive manual operation flows could easily enhance people's fatigue, therefore, in this paper, the presently existed flows and steps of the cases under study and the abnormal processing data were collected and summarized to come out with the proportion of repeatedly occurred abnormity, meanwhile, assisted too l presently existed in the market was introduced into the case in study to find out effective improvement project. In t his paper, exchange clamping too l for standard product sol d in the market, out-of-machine pre-calibration system, change operation flow, and secondary development application of software were used to improve the process of electrical discharge machining so as to enhance t he competitive advantage of the mo ld company.