Simulation Analysis And Experiments On Cutting-Extrusion Process Of Finned Tube

The finned tube is an important component which has a wide range of applications in the field of heat transfer.Cutting-extrusion composite forming is a new processing method,which combine turning and extrusion processes,using a specially designed cutting tool for finned tube machining.The finned tube could be processed by the processing method without the high precision manufacturing equipment and no chips could be produced in this process,so it’s a green and efficient manufacturing method.In this thesis,the cutting and extrusion shaping process of finned tube is simulated and studied experimentally,which provides the basis of parameter selection for practical engineering application.So,it is of great theoretical and practical significance.The mathematic model of the structural dimensions of the fin which is upright on the outer surface of tube has been established.The influence of process parameters and tool parameters on the shape and size of fins have been studied during fin forming process.The influence of cutting depth,feed rate,tube’s radius and tool cutting edge angle on fin shape and forming size has been analyzed.The variation law of fin shape and size with process parameters has been obtained.Based on the finite element theory of rigid-plastic and the finite element method of thermo-mechanical coupling,the finite element model of finned tube has been established.According to single factor multi-level and orthogonal test scheme,the forming process of finned tube has been simulated by using the DEFORM-3D finite element software.The effects of cutting depth,cutting speed and feed rate on fin type,temperature,stress and strain has been analyzed during the fin forming stage.The relationship between process parameters and fin height and fin thickness has been obtained.The finned cutting-extrusion composite forming experiment has been carried out.different types and sizes of fin structures have been obtained from the experiment.Taking the incremental surface area of the fin of 1/4 single piece,the height of fin and the thickness of fin as a research,the results of experiment,simulation and mathematical calculation of fin has been compared and analyzed.The correctness of the mathematical model,simulation model and simulation results have been verified,which can provide reference for optimizing the selection of cutting tool and cutting parameters and which is of great significance to the engineering application of this technology.