针对大圆弧形机壳，设计了一次折弯成形结构模具，减少工序，降低成本。
Aimed at large arc shape frame, the die with once bending forming structure is designed, the working procedure is reduced, and the costs are lowed as well.
通过列举各类特殊的模具结构，介绍合理减少工序数，提高冲压模具复合程度的各种措施。
Many methods to reduce working procedure reasonably and to improve the compound degree of stamping die were described by enumerating many kinds of special structure of die.
隧洞衬砌采用针梁滑模、全断面一次浇筑的方法施工，可以减少工序作业，保证施工质量。
The tunnel is lined with the method "single placement for the full cross using needle beam sliding form", which can save construction procedures while ensuring quality.
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