For many years, those engaged in research on cold-rolled pipe mills and production of cold-rolled steel pipes have hoped to achieve high-speed and high-precision rolling on the basis of existing two roll cold-rolled pipe mills, in order to create higher output, quality, and efficiency!
The key components of a two roll cold rolling tube mill are the main frame drive mechanism and the rotary feed mechanism. Domestic two roll cold-rolled pipe mills are all used$ The Soviet Union in the 1940s and 1950s! The # series of two roll semi-circular pass cold rolling tube mills are mainly used (also known as Cold @'02.1 ', 2, domestic code: GA). Due to the flat contact surface between the pass and the roll of the two roll semi-circular pass cold rolling tube mill and the key positioning on the side, the rolling force during rolling cannot always be kept perpendicular to these surfaces. The rolling force on the same surface also changes with the position of the pass, making these surfaces easy to wear. Once the bottom and side of the pass and roll are worn, the pass rolling curve will change, affecting the rolling accuracy, and the pass and roll are prone to damage. The circular pass tube mill, due to the circular bottom of the pass, has circular contact surfaces with the roll and pass, and the rolling force during rolling always remains with these surfaces. Vertical, making these surfaces less prone to wear (compared to semi-circular holes) The pass rolling curve is not easily changed, and the rolling accuracy is easy to ensure. At the same time, due to the short pass curve, the unit rolling force distributed on the pass curve of the semi-circular pass is relatively large, and the pass wear is fast. In addition, the pass curve must reach a certain length to be rollable, so the diameter of the rolling mill (pass) must be guaranteed before rolling. In addition, the enclosed frame and rolling mill are integrated, which increases the weight of the entire rolling mill's moving parts, making it difficult to ensure the dynamic balance of the transmission mechanism, thus making it difficult to improve the rolling mill's movement speed and long stroke rolling, and thus reducing the production efficiency of the rolling mill. The key component of this two roll cold rolling pipe mill!! The rolling mill motion mechanism and rotary feeding mechanism have not been improved for a long time, and have always been installed on the rolling mill with semi-circular hole patterns. The rolling mill moves back and forth together with the random frame, resulting in excessive weight of the moving parts; The power transmission mechanism is an eccentric connecting rod mechanism, which swings in the vertical plane, making it difficult to balance the moving parts and unable to increase the rolling speed; The other key component, the rotary feeding mechanism, adopts a combination of cam rocker and overrunning clutch, which results in uneven feeding and the formation of corrugated pipe walls with varying thickness in the longitudinal direction of the steel pipe, making it difficult to effectively improve rolling accuracy. Therefore, this cold rolling mill has high consumption, low production efficiency, and poor accuracy. Usually used for cutting. Due to the lack of significant breakthroughs in the structure of this type of cold-rolled pipe mill in China for a long time, the rolling speed has not been greatly improved, resulting in a lack of upgraded products. The efficiency of producing steel pipes through cold-rolled pipe mills has been relatively low. As a cold-rolled steel pipe production enterprise, there is an urgent need for an upgraded product to improve production efficiency.
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