line-hole drilling

This article mainly suggests using the drilling template to solve the difficult problems of manufacturing the group of line hole in the brace.

主要研究采用钻模板来解决支承架上行孔组的加工难题。

Designed with a form as from top to bottom and group drilling set, a new type of drilling machine for air hole for automatic molding line has been awarded a national patent.

新型钻气孔机用于全自动造型线，设计采用自上而下、群钻气孔方式。该设计已获得国家专利。

The wire-line directional drilling and coring technology can take cores and drill directionally without using down-hole motors.

绳索取心技术因其钻进效率高而广泛应用，但其无法实施定向作业。