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某航空产品零件口盖座,系一个典型的拉深件。零件凸缘由圆柱曲面组成。由于设计上的需要,拉深圆筒底部圆角半径只有一个料厚,在成型中,由于凸缘材料不能有效地进入凹模腔,加之底部圆角半径过小,这就给拉深成型带来了极大的困难。原设计用料是08F—δ1.5冷轧钢板,由于此规格的料外购困难,只好用08A1—δ1.5冷轧钢板代料。从有关资料来看,08F和08A1在强度、延伸率等指标上均差不多,可是零件拉深后,在底部圆角处材料发生明显的塑性流动,表面呈一浅沟,剖面如图(1)所示。还有部分零件因材料流动过大而拉裂,剖面局部最小厚度只有0.5～0.86毫米。有关标准中给出拉
A aviation product parts cover seat, Department of a typical drawing parts. Parts flange consists of a cylindrical surface. Due to the design requirement, the radius of the bottom of the drawing cylinder is only one material thickness. Since the flange material can not effectively enter the cavity and the radius of the fillet at the bottom is too small, Great difficulty came. The original design is 08F-δ1.5 cold-rolled steel, due to the specifications of the material outsourcing difficulties, had to use 08A1-δ1.5 cold-rolled steel substitute. From the relevant information, 08F and 08A1 in strength, elongation and other indicators are similar, but the parts after drawing, the material at the bottom of the sharp plastic material flow, the surface was a shallow groove, the profile shown in Figure (1) As shown. There are some parts due to material flow is too large and cracked, the minimum thickness of the profile section only 0.5 ~ 0.86 mm. Relevant standards given in the pull