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Threaded pipe is also called low-ribbed pipe, which mainly expands the heat transfer area by the external ribbing of the pipe (the ribbed coefficient is 2-3). occasion. For condensation boiling outside the tube, due to the effect of surface tension, it also has a better strengthening effect.
As the core heat exchange element of the heat exchanger, the heat exchange tube improves its heat transfer performance, controls volume quality, saves materials. It is of great significance for improving the efficiency of the heat exchanger reducing costs. High-efficiency heat exchange tube technology has generally used threaded tubes. Compared with traditional smooth tubes, it has the advantages of high heat transfer efficiency, easy scaling, small size, material saving. Threaded pipes work in harsh environments such as high temperature, high pressure corrosive gases for a long time, have high requirements for their corrosion resistance stability. At the same time, considering the difficulty of production methods processing techniques, copper aluminum are usually used as threads The material of the tube. Although the price of aluminum tubes is lower than that of copper tubes, it has the disadvantages of poor welding processability, poor heat transfer performance, easy damage by metal expansion heads when expanding the tube, which has been widely used. In recent years, as the copper price has been rising all the way, the price of stainless steel has been greatly reduced, the production process of stainless steel pipe has been continuously improved. As a substitute material with more superior performance lower cost, stainless steel threaded pipe has broad application prospects.
The processing methods of threaded pipe generally include stranding method, rolling method, extrusion method rolling method. They are usually used to process threaded pipe with large diameter thick wall, the processing accuracy is high. For small heat exchangers, the use of thin-diameter, thin-walled stainless steel threaded pipes with poor rigidity small volume obviously cannot be processed by traditional methods. Therefore, a new type of thread processing technology is proposed, a thread automatic processing control system based on PLC servo system is designed. The control system has high working reliability high degree of automation, large output, processing precision meets the requirements, simple convenient operation
Due to the poor rigidity small size of small-diameter thin-walled stainless steel pipes, if traditional processing methods are used, it is only difficult to manufacture small-sized processing tools, but also difficult to guarantee the accuracy of processing, the product specifications are single. Considering that the small-diameter thin-walled stainless steel tube is shaped better, we can refer to the spinning process, that is, one end of the stainless steel tube is fixed on the chuck by a clamping cylinder, the chuck is driven by the spindle motor to rotate. The rotating wheel frame is the same as the stainless steel tube The shaft is equipped with a screw cylinder a hard alloy rotary wheel. The rotary wheel frame is connected to the threaded motor through a screw rod. The rotation of the threaded motor drives the rotary wheel frame to move axially.