There is a layer of oil on the surface of the quilted cylinder tube and the cold drawn tube. Most of the cold drawn tubes are seamless tubes and secondary tubes for mechanical cold drawing. During the cold drawing process, oil will be used to lubricate the extrusion to make the original large diameter smaller and smaller. Mechanical energy changes that produce changes in wall thickness . And most of the quilted cylinder pipes are also cold drawn pipes because the precision tolerance range is smaller than that of ordinary seamless ones, and it is much easier to process and grind . The quilting machine also uses oil for cold drawing and seamless pipe quilting, which can improve the smoothness and the metal itself . In addition, the quilted tube and cold drawn tube are also cross-utilized when there is no special requirement . Because its straightness and smoothness can be as good as the naked eye within the national standard . It's just that the processing technology is different . The commonality between the quilted cylinder tube and the cold drawn tube is that it is a cold drawn or cold rolled precision seamless tube for mechanical structure and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly save mechanical processing man-hours, improve material utilization, and at the same time help improve product quality.
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