Use constructional type of progressive dies, change present one step operation of single die construction for two-step blanking, i. e, first step semi-blanking, second ejecting material.
用级进模结构形式，改现行简单模结构的一工步操作的冲裁为两工步操作：第一工步为半冲裁，第二工步为推料。
Use constructional type of progressive dies , change present one step operation of single die construction for two-step blanking , i.
用级进模结构形式，改现行简单模结构的一工步操作的冲裁为两工步操作：第一工步为半冲裁，第二工步为推料。
According to the final results of analysis, a reasonable excavation length of inverted arch in one step was put forward and applied to the construction of multi-arch tunnel in loess.
最后提出了最佳的黄土仰拱一次性开挖长度，并应用于黄土连拱隧道的施工。
According to the final results of analysis, a reasonable excavation length of inverted arch in one step was put forward and applied to the construction of multi-arch tunnel in loess.
最后提出了最佳的黄土仰拱一次性开挖长度，并应用于黄土连拱隧道的施工。
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