Experimental Study And Numeric Simulation Of Drawing Process In Sheet Stamping Forming

Sheet metal stampmg is a sheet metal forming process by using molds to get products that fit the requirement of design in shape, dimension and performance. As sheet metal stamping can provide the advantages such as saving materials, high efficiency and low cost, it is one of the important machining processes in manufacturing industries, i.e., machinery, electron, instruments and aerospace, etc. Drawing is one of the most typical sheet metal stamping processes, which is also widely used in practical production of many work pieces. Although existing researches on drawing have already developed to a relatively high level as well as abundant correlative literatures focus on it, there are still some fields need to be studied. Therefore, thorough and further research on drawing process is quite necessary.Based on the development history and status quo of drawing process, this paper is focused on the drawing process which has not been studied well. For example, the influence of material thickness variety and material work hardening were omitted in the calculation to the drawing deformation pressure, etc. The main research contents and results are listed as follows:(1) Technologic experimentsWith utilization of technologic experiments being designed, deformation characteristic and technological parameters are comprehended, as well as drawing force can be measured. The instance of drawing force can provide foundation and validation for theoretical study.(2) Numerical simulationWith utilization of FEM software DEFORM, Simulation and analysis on deformation course of drawing was carried out. Effective stress and effective strain are analyzed, the state and condition of fracture in drawing process are simulated, and drawing force is analyzed, which can provide foundation and validation for theoretical study. (3) Theoretical studyBase on technologic experimental results and numerical simulation results, with utilization of slab method of plastic mechanics and material work-hardening theory, a new calculational formula of cylinder drawing force was deduced, and compared with different calculational formulas of drawing force.The studies of this paper enriched the contents and the theories of drawing process, which brought both academic and practical significance as well as its research method can be validated. It can provide references for the technicians who are engaged in sheet metal stamping field.