Research On Rolling Forming Process Of Plate-Fins By Numerical Simulation And Law Of Parameters Control

As a strengthened heat transfer's key part, plate-fins have been used widely in the field of petroleum chemical industry. Its advantage and disadvantage of processing quality and construction have direct influence on the performance of heat transfer enhancement. Therefore, exploration and research of the new process for fin machining have very important meaning. There are many problems such as complicated technology, manufacturing cost and higher, poor operation performance, etc, in the plate-fins processing process. Rolling forming processing which is a green processing method of plate-fins is presented according to those problems in this paper.The characteristic of plastic deformation in rolling forming process for plate-fins is analyzed. The mathematics and mathematical model for the forces of rolling forming tool in rolling forming process is constructed. The force prediction calculation formula of rolling forming tool is derived. Rolling forming tools have been designed with the principle of metal plastics deformation. The theory calculation model for fins forming is constructed base on the constant volume principle and the least resistance principle; the theory calculation formula of fin height is obtained, providing a theoretic basis for further research of plate-fins rolling forming technology.Base on the relative movement relationship between rolling forming tool and workpiece in rolling forming process, the finite element analysis model for plate-fins rolling forming is established. The numerical simulation of rolling forming process for plate-fins is carried out by using the Deform-3D software of FEM. CoMParison analysis on the distribution of effective stress, effective strain and flow velocity field in rolling forming process between A-type fin and rectangular-type fin. The deformation condition of workpiece materials is studied by using point tracking during the rolling forming process. The strain extent curves of each tracing point are given. And the plastic flow laws of metal are revealed in the plate-fins rolling forming process. In view of the structure problems on rolling forming tools in fins rolling forming process, the effective stress distribution on the rolling forming tools at different time during rolling forming process was studied. CoMParison analysis on the variety condition of load on tools during rolling forming process between A-type fin and rectangular- type fin, provide a certain reference to the optimal design for the structure of rolling forming tools.With the method of orthogonal test, the influence law of processing parameters, which include reduction, rolling speed, friction factor, tool angle,etc. on the plate-fins rolling forming is obtained;. The experiential formulas of fin height and sheet metal being elongated length are obtained by the multiple nonlinear regression analysis method. The regression results of the formulas are significantly by F-test, can be used to guide the practical production of plate-fins rolling forming.According to the characteristic of plate-fins rolling forming, an experimental scheme is designed. The structures of fins are agreed with the simulation results by rolling forming processing experiment. The result shows that the numerical simulation is authenticity and effective predictability. Meanwhile, the practice verifies that plate-fins rolling forming process can be used in practical production. Design the plate-fin rolling forming equipments based on the numerical simulation and rolling experiment, laying the foundation for production manufacturing of forming equipments and extension and application of the plate-fins rolling forming process.