四、工艺与结构试验结果多排辊冷轧管机的研制是在实现大减径量、大减壁量冷轧管机结构和轧制工作原理方面的探讨和试验。目前在国内和国外的实践中尚没有先例。因此必须在理论和实践上对于轧机的主要工作原理、结构特点和轧机的主要性能参数,如轧机机架每分钟的摆动速度、送进量、减径量、减 Fourth, the process and structure of the test results Multi-roll cold rolling machine is the development of large-diameter, large volume reduction of cold-rolled tube machine structure and rolling working principle of the discussion and test. There is currently no precedent in the practice at home and abroad. Therefore, in theory and in practice, the main working principle and structural characteristics of the rolling mill and the main performance parameters of the rolling mill, such as the rolling speed per minute of the rolling stand, the feeding amount, the reducing amount and the reduction