穿孔机

Of equipment; without a motor and intended for hand operation (“a manual keypunch”; “a manual typewriter”).

对备言,指无马达和用手操备(如人工键穿孔、人工打字)。

The briefing covers quality of the shell pierced by the three-high piercing mill, thespecific rolling failures and countermeasures thereagainst.

简要地介绍了三辊穿孔所穿毛管质及该穿孔特有轧制故障和预防措施。

Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.

穿孔是轧制钢管重要备,又是穿孔核心组成部分。