Abstract
In order to achieve the nonsmooth surface drag reduction structure on the inner polymer coating of oil and gas pipelines and improve the efficiency of pipeline transport, a structural model of the machining robot on the pipe inner coating is established. Based on machining robot, an experimental technique is applied to research embossing and coating problems of rolling-head, and then the molding process rules under different conditions of rolling temperatures speeds and depth are analyzed. Also, an orthogonal experiment analysis method is employed to analyze the different effects of hot-rolling process apparatus on the embossed pits morphology and quality of rolling. The results also reveal that elevating the rolling temperature or decreasing the rolling speed can also improve the pit structure replication rates of the polymer coating surface, and the rolling feed has little effect on replication rates. After the rolling-head separates from the polymer coating, phenomenon of rebounding and refluxing of the polymer coating occurs, which is the reason of inability of the process. A continuous hot-rolling method for processing is used in the robot and the hot-rolling process of the processing apparatus is put in a dynamics analysis.
Highlights
Continuous hot-rolling transfer process employs rollers for rolling and continuous imprinting
It compares the characteristic structure of hot-rolling-head with the pits characteristic structure of polymer coating
It can be inferred that pits structure replication can be achieved on polymer coating, and consistent lines morphology can be achieved with the standard pits
Summary
Continuous hot-rolling transfer process employs rollers for rolling and continuous imprinting. Its characteristics include better flatness, smaller imprint pressure, and requiring simpler equipment; it needs only one mold to complete large-area substrate continuously imprinting, which can increase the production greatly [1]. Hot-rolling transfer processes include two copy types, the first uses a cylindrical mold with fine surface characteristics, and the second type uses roller with smooth cylindrical surface. Fine surface characteristics can be achieved by using the traditional microfabrication on its surface or by the method of covering smooth cylindrical surface with flexible membrane. The second type employs the traditional flatbed mold to achieve continuous transfer process. Regarding the exploration of this process, it is still in its infancy [2, 3]
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