According to the openness of process planning knowledge base, this paper proposes a hierarchy knowledge base model based on open structure.

根据工艺设计知识库的开放性要求，提出了一个基于开放式结构的层次化知识库模型。

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So the case-based reasoning technique used in the assembly process planning is an effective approach to utilize the past experience and knowledge in design and to realize rapid product development.

因此，在装配工艺规划工作中采用基于实例的推理技术，是有效利用以往设计经验和知识，实现产品快速研制的一种有效途径。

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The knowledge-based engineering(KBE)technology was applied to the planning of stamping process for automobile body metal sheets.

提出了将KBE方法应用于汽车覆盖件冲压工艺设计，叙述了基于知识的拉伸工序件设计过程。

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