Based On Dynaform-Prediction Of Sheet Metal Stamping Performance And Simulation Of Drawing Method

In 2009,China's automobile output have exceeded 10 million and the domestic auto industry is booming day by day.Using new materials in producing auto parts can reduce auto body weight and adapt to command of global economic, security and environmental protection. At the same time it is the main trend of the current auto industry development.The most simple and effective way to losing weight is to improve the body strength and reduce steel thickness of the body.Present high-strength steel plates are widely used in car body instead of the traditional low-carbon in foreign countries and many research is being done about aluminum alloy sheets used in body. Some large companies began to design and manufacture car model with new aluminum body.China also began to keep up with the trend of development of foreign cars, and high strength steel plates in some parts of the automotive design and manufacture are instead of the traditional low-carbon steels. However, aluminum alloy plate used in automotive body is still a very backward state, only stopping at some applications of the automotive engine which use a number of aluminum casting, die casting.This paper study and summarizing the some research results home and abroad, and research high-strength steel with several different thicknesses which have be used in our automobile industry or will be use in the future . Experiment way is taking simulation ,whose advantages are neat and tidy experimental conditions and a fewer affect of experimental conditions factors. The ways of simulation for practical application of several new materials provide more reliable experiment data.This experiment apply Dynaform sheet forming simulation software and CATIA modelling to finish. Research results are as follows:1. Import 3-D design with spherical-normal spherical R10mm, blank holder pore size 33mm,die fillet radius 0.75mm into Dynaform, figure out IE number with the material of St14F,B140H1,B170P1和BIF340 with thickness prediction 0.7mm, St14F,St16和BIF340 with thickness prediction 0.8mm, St13,St14F,St16和B170P1 with thickness prediction 1.0mm. Summary analyse the influnce of yield ratio and n number to IE .2. Twice drawing simulation experiment of tube-shaped shell is carried out by phosphorus steel B170P1 which produced by China's Baosteel.The simulation experiments are done with respective drawing coefficient 0.464-0.72;0.451-0.74 and0.44-0.76.Respective blank holder force of first drawing 2KN,3KN,4KN,5KN,7.5KN,10KN and 20KN,Respective blank holder force of twice drawing 0.2KN,0.4KN,0.6KN,0.8KN and 1KN.Comparing these three groups drawing coefficient , the thinning and thickening situation of Material forming ,Shaping result by blank holder force of first drawing 4KN,drawing coefficient 0.464,blank holder force of twice drawing 0.8KN drawing coefficient 0.72 are Preferred choice and analyse reasons of this material prone to cause wrinkling defects and the causing wrinkles in deep drawing .Observe the wrinkles worsening situation in the second drawing,which effect the drawing of cylinder wall.3. Forward and backward drawing primary shaping simulation experiment of tube-shaped shell is carried out with 08Al steel .circular blanks diameter s respectively are 83mm,80mm,77.5mm,75mm.Analyse the influence of circular blanks diameter s to material flowing within the tube wall.When circular blanks diameter is75mm,we do the simulation experiments by reverse punch and die diameters 3.5mm,3.5mm,4.5mm,4.5mm和5.5mm,5.5mm,and analyse the influence of Punch and radius to material flowing within the tube wall.