Development of manufacturing technology for bimetallic pipes

The aim of the study was to develop a cost-effective technological process for manufacturing axisymmetric parts of the «Bimetallic tube» type with an internal cooling circuit. The article proposes to consider the technological process of cold volumetric stamping, which includes the most rational, from the point of view of resource saving, operations - reduction of a billet made of low-carbon structural steel and burnishing of a billet with high resistance to intercrystalline corrosion from low-carbon stainless steel. The product obtained by experimental technology, which is a bimetallic pipe with an internal cooling circuit. The developed computer model of the technological process made it possible to obtain a competitive product that has a wide range of applications. In the course of the work, an experimental study was also conducted, which confirmed the results of computer analysis. The absence of rubber seals in the production of the heat exchanger allows it to be used for aggressive environments in the chemical, oil and gas industry with temperatures from minus 40 to 300 degrees Celsius. The technology will increase the working pressure of the heat carriers to a value of at least 2 MPa. Due to the small cross-section of the cooling circuit, it is possible to achieve high coolant speeds, and the multi-entry circuit allows for a larger volume of coolant. At the same time, the efficiency of the heat exchanger increases by 5% compared to the sectional heat exchanger in its classic design. Quality characteristics: low metal consumption, strength, reliability, safety, ease of installation, maintainability. One of the main advantages of the technology is the high surface quality of the product (Ra 1,6), which guarantees the turbulent flow of the coolant. The efficiency of the heat exchanger according to the strictest estimates and for the most unfavorable conditions is 86.6%.