This article mainly suggests using the drilling template to solve the difficult problems of manufacturing the group of linehole 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。
2
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。
3
The wire-line directional drilling and coring technology can take cores and drill directionally without using down-hole motors.