Optimization of drawing process parameters for automobile engine hood outer plate

YAO Da-suo
(Department of Mechanical Engineering, Tianjin University Renai College, Tianjin 301636, China)

Abstract: Aiming at the problems of wrinkling, cracking and insufficient drawing in the drawing process of automobile engine hood outer plate,the process parameters that affect the forming quality of the engine hood outer plate were studied.The single factor variable method was used,the effects of blank holder force, clearance between punch and die, friction factor, drawing rib height and stamping speed on the drawing process of engine hood outer plate were studied.Based on the orthogonal test method and range analysis method, taking the maximum thinning rate as the optimization objective, an optimization method was proposed to obtain the optimal combination of process parameters and determine the primary and secondary order of the influence of various factors on the maximum thinning rate of the engine hood outer plate. Through variance analysis of the test results, the significant factors influencing the maximum thinning rate were obtained. The optimized process parameters were applied to simulate, and good drawing effect were obtained. The results indicate that by using the optimum combination of process parameters to test the die, the maximum thinning rate of the engine hood outer plate is 19.585%, the maximum thickening rate is 1.047%, the forming quality is good. The application of numerical simulation technology based on orthogonal test method can improve the forming quality of engine hood outer plate, reduce the number of die tests, shorten the production cycle and reduce the production cost.
Key words: drawing forming; hood outer plate; orthogonal experiment; optimization of process parameter ;finite element analysis; Dynaform