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汽车前副车架上板料厚3.5 mm,型面变化复杂,有多处凹凸面,装配孔与其他零件装配精度要求高,零件成形难度较大。制定了五工序的冲压工作内容,其中拉延为最重要的成形工序。其工艺方案的关键技术是采用工艺凸包,防止转角在拉延时开裂。针对前副车架上板的材料厚度大、形状复杂、材料流入困难的问题,在内外压边圈均不设拉延筋,使成形得以顺利进行。应用Auto Form软件对前副车架上板进行成形仿真分析,通过多次调整压料面、工艺补充面、圆角、板料外形、压边力,得到了优化后的拉延工艺数模,并生产出质量合格的产品,验证了冲压工艺改进的有效性。
The thickness of the front panel of the car is 3.5 mm on the front subframe, and the profile changes in a complicated way with multiple concave and convex faces. The assembly holes and other parts require high assembly precision and the parts are difficult to shape. Developed a five-step stamping work content, of which drawing as the most important forming process. The key technology of its process technology is the use of technology convex hull, to prevent corner cracking in the drawing. Aiming at the problem that the thickness of the material of the front subframe on the board is large, the shape is complicated and the material inflow is difficult, no drawbead is provided on both the inner and the outer blankets so that the forming can be carried out smoothly. Auto Form software was used to simulate the forming of the front sub-frame, and the optimized drawing mode and number of the drawing process were obtained by adjusting the surface of nip, And to produce qualified products, verified the effectiveness of stamping process improvement.