| Hydraulic counter pressure deep-drawing method is being more regarded and attended by international stamping kingdom since 80 years, because of its guaranty of quality, reduction of cost and erection time. The square reflector, a part of auto is a more complicated and typical curved part , it is the prolongation of the complicated typical curved part's study of today. This article presents the importance and necessity about research on parabolic part with hydraulic counter pressure drawing by means of analysis and demonstration of related document and national actual situation.According to analysis of actual situation in the majority enterprise in our country, a set of economic device is developed, including hydraulic system, electricity system and computer controlling system, it can implement hydraulic counter pressure drawing on one-action hydraulic press, its stability and reliability is verified by practice.By analysis of the failure in normal drawing and hydraulic counter pressure drawing, the distributing disciplinarian of stress in hydraulic counter pressure drawing is discussed. Then some appearance of failure during the forming is explained, wall wrinkle suppressed mechanics is explained.Defective shape precision at wall and rupture at die corner easy happen in deep square reflector part with normal drawing, so square reflector part is hard to form. By analysis of quantities of experiments, the increase of square reflector part Forming Limit with hydraulic counter pressure drawing is verified, the successful zone is given, the effect of chamber pressure and blank force and drawing bead on forming results is specifically discussed, the effect of drawing bead is also discussed. |
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