The fin-fitting process is to process a batch of individual fins with a punch in advance, and then use manual or mechanical methods to fit the fins on the outer surface of the tube at a certain pitch (fin pitch) by interference. The set process is simple, the equipment price is low, and the maintenance is easy. Inlaid spiral fins are pre-processed on the steel pipe with spiral grooves of a certain width and depth, and the steel strip is inlaid on the steel pipe on the lathe. The brazed spiral fin tube winds the steel strip plane perpendicular to the pipe axis on the outer surface of the pipe in a spiral manner, and then the gap between the steel strip and the steel pipe. The steel strip and the steel pipe are welded together by brazing. Another method is to put the steel strip wrapped tube into the zinc bath for overall hot-dip galvanizing instead. The high-frequency welding spiral fin uses the skin effect and proximity effect of the high-frequency current while the steel strip is wound on the steel pipe to heat the steel strip and the outer surface of the steel pipe until it is plastic or melted, and the welding is completed under a certain pressure of the steel strip . The three-roll skew-rolled integral spiral fin tube is lined with a mandrel inside the smooth tube. Driven by the rotation of the roller blade, the seamless steel pipe is processed with fins on its outer surface through the cavity formed by the rolling groove and the core head.
https://www.simcanindustry.com/