Development and Construction of the Expert System for Finishing Operation of dies and Molds.

为了建立模具自动化制造系统，必须首先解决模具工业中的两个问题。一个是自动设计系统。另一种是模具型腔表面的表面精加工技术。特别是塑料模具的型腔表面仍然是由熟练的机械师手工完成的。本课题利用模具技工对模具抛光操作的知识，开发出性能良好的自动抛光工具，并建立了抛光工艺设计专家系统。研究总结如下：1。对一个熟练的机械师的抛光性能在表面粗糙度、去除杂质和划痕方面进行了定量分析。利用熟练的机械师知识构建了模具抛光专家系统，并通过模具车间的实验验证了该专家系统的可行性。用不同的抛光工具进行精加工实验，既有熟练的机械师手工加工，也有数控铣床机械加工。根据该专家系统的解决方案，选择抛光工具和抛光行程数对S55C钢的铣削表面进行抛光。结果表明，该专家系统可用于抛光工艺的调度和确定，并验证了所开发的刀具的性能与模具机械师的专家性能相似。

In order to establish an automatic manufacturing system for dies and molds, two problems in the mold industry must primarily be developed. One is an automatic design system. and other is a surface finishing technology for acavity surface of dies and molds. Especially, the cavity surface of plastic mold is still finished by handiwork of a skill machinist.In this research project, the knowledge of a mold skilled machinist for mold polishing operation was acquired to develop good performance of an automatic polishing tool, and an expert system to design the polishing process were established.The study is summarized as follows :1. The polishing properties of a skilled machinist in respect tosurface roughness, stock removal and scratch were obtained and analyzed quantitatively.2. An expert system for mold polishing by using the knowledge of skilled machinists was constructed, and the feasibility of the expert system is verified with experiments in die and mold shop.3. Finishing experiments were carried out with different kinds of polishing tools, not only by a skilled machinist handiwork, but also by mechanical method by using NC milling machine.4. According to the solution of this expert system, milled surface of S55C steel were polished with selected tools and the number of polishing strokes.5. Consequently, this expert system was confirmed to be useful for scheduling and determination of the polishing process, and it was verified that the performance of this developed tool were similar to expert's performance of mold machinist.