The piercing plug is one of the most important tools used for the seamless steel tube production.
穿孔顶头是无缝钢管生产中最重要的模具之一,文章通过分析穿孔机顶头的失效形式,并从顶头外形、材质、表面氧化等方面探索提高顶头使用寿命的方法。
The microstructure and hardness of piercing plug made of 20CrNi3MoW steel were studied.
对20CrNi3MoW钢穿孔顶头的显微组织和硬度变化进行了研究。
This review focuses on various aspects of piercing plug surface oxide film,including formation,compose,property,effect,transformation in the piercing course and the influence of plug's life.
概述了穿孔顶头表面氧化膜的形成、结构、性质、作用,在穿孔过程中的变化及其对顶头使用寿命的影响。
Discussion on Heat Treatment of 3Cr2W8V Three Rolls Punching Stamp
3Cr2W8V钢制三辊穿孔顶头的热处理探讨
Status Quo on Research of Failure Forms and Improving Measures of Piercing Plug
穿孔顶头失效形式及改进措施研究的现状
Design of Piercing Mill Plug with ActiveX Automation Method
穿孔机顶头设计的ActiveXAutomation方法
prick holes in paper with a pin
用大头针在纸上穿孔.
Many of the roofs were so full of holes that they looked like gratings.
许多屋顶千穿百孔，象筛子一样。
a shaker with a perforated top for sprinkling salt.
撒盐的顶部有穿孔的混合器。
a shaker with a perforated top for sprinkling ground pepper.
用来洒胡椒粉的顶部有穿孔的混合器。
You run the thread in through this little hole in the top.
你把线从顶部的这个小孔中穿过来。
Discussion on Revamping of The Large Diameter Piercing Head of 10MN Vertical Piercing Mill
10MN立式穿(扩)孔机大直径扩孔头的改造
The impact was so great that it had gone through the roof,
碰撞非常剧烈，以致石头穿过车顶，
Analysis on Driven System of the Mandrel Thrust Block of Piercing Mill
无缝钢管穿孔机组顶杆小车传动装置浅析
Would you ever pierce your tongue?
你会给你的舌头上穿孔吗？
a perforated nozzle that showers water on a bather.
人淋浴时用的穿孔的喷头。
A garment, such as a sweater, that is put on by being drawn over the head.
套头衫羊毛衫等从头顶拉下穿着的服装
A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface.
埋头孔顶部扩大的孔，为使钻或螺栓的头与地面相平或在地面以下
High above him there's a swallow Winging swiftly through the sky.
在他头顶上方一只燕子振翅高飞，穿越蓝天。
He wore a black hat and a pair of pointed shoes.
他戴了一顶黑色的帽子，脚上穿了一双尖头鞋。
Study on Key Parameters of Self-Propelled Rotatory Nozzle for Water-Jet Deep Penetrating Perforation
水力深穿透射孔自进旋转喷头关键参数研究
