Although the development of piercer in China has achieved a historic leap and made remarkable achievements, we should also be soberly aware that there is still an inevitable gap between the overall level of piercer manufacturing in China and that in developed countries. The essence of seamless steel tube is to punch and roll solid tube blank or ingot into hollow section steel tube, and its basic technology is punching and rolling. External meshing ratchet mechanism is widely used because of its convenient processing, installation and maintenance. We already have various typical units for seamless steel pipe production in the world. Firstly, the upper die holder, the lower die holder, the fixing plate, etc. are collected. The movement of cam and eccentric wheel is two non-interference processes and continuous. In recent years, the φ8mm three-roll adjustable continuous pipe mill (semi-floating mandrel pqf) has been introduced into Tianjin Steel Pipe, which is the first new continuous pipe mill in the world to comprehensively improve the traditional two-roll limited mandrel continuous pipe mill. Panzhihua Iron and Steel Company introduced φ0mm continuous pipe mill.
Compared with advanced enterprises in Europe, America and Japan, domestic perforators still have a certain gap in efficiency, accuracy, invariance and energy saving. In some types of piercing machines, domestic machines are still in the blank, product homogeneity is serious, and wealth upgrading is facing great challenges. When designing the ratchet mechanism, it is necessary to meet the requirements that the pawl can smoothly slide into the ratchet tooth slot and will not automatically disengage from the ratchet tooth when stressed. After the machining starts, I will adjust a large period every 2 seconds when touching the workpiece.