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1·Briefly described in the article are the structure of the three - roll piercing mill and troubles and failures frequently occurring in the operation thereof.

简介了三辊穿孔机的结构以及在生产过程中的常见故障和事故。

2·Introduced in the article are the technical features and equipment structure of the dynamically stable 2-roll horizontal piercing mill as well as its operation results.

主要介绍了动态平稳的二辊卧式穿孔机的技术性能、设备结构及其使用效果。

3·This paper analyzes the reasons leading to rolled stock jamming in duo cone type piercing mill on piercing mill adjustment and tool shape etc. and puts forward corresponding preventive measures.

从穿孔机调整、工具形状等方面分析了二辊锥型穿孔机产生轧卡的原因，并提出了相应的预防措施。

4·The causes of the mid-seizing in piercing are analysed regarding to the aspects such as mill adjustment and billet heating quality, and the measures to avoid the mid-seizing are proposed.

从穿孔机的调整，管坯的加热质量等方面分析了中轧卡产生的原因，并提出了防止中轧卡的措施。

5·The original structure of three-rolls piercing-elongating mill is improved. And good results have been achieved.

对原有三辊联合穿轧机结构上存在的问题进行了改进设计，并取得良好效果。