级进模工步排样是级进模设计的核心，理论上属NP完全问题。

Strip layout is the key procedure in progressive die design, it is known as a NP hard problem.

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分析了零件的特点，介绍了级进模设计要点，总体设计结构和排样方案。

Parts characters are analyzed, as well as, the critical progressive die design points, general design structure and layout program are introduced.

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工步排样是级进模设计的核心，智能化工步排样是冲模设计专家系统的主要研究内容。

Strip layout is the kernel in progressive die design and intelligent strip layout is the main con tent of stamping die expert system.

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