推荐采用振冲挤密砂桩是较为经济合理的一种方法。

The vibroflotation sand compaction pile is an economical, reasonable ground treatment method, and it is recommended to use in this substation foundation.

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冲挤花键孔的步骤可采用本发明所设计的专用模具在压床下完成。

The steps for punching and extruding the splined hole can be finished by a special die which is designed by the invention by a press.

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介绍了小规格丝锥毛坯，采用软化处理工艺与降低待冲挤面表面粗糙度的方法，来防止冲方时容易产生裂纹的措施。

This paper introduces the method to treat the tap of small specifiations using the softening technology and the way to reduce the roughness of the surface to avoid cracks when punching.

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