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针对带凸缘锥形零件的成形特点,根据金属薄板冲压成形原理及生产实验进行工艺计算与分析,找出该类型零件拉延成形时废品率高的原因。选用成本相对较低的08Al带凸缘锥形零件,选用液压成形设备,将压边力调整在195～260kN之间,通过在模具压边圈上加工环形槽、增加塑料布润滑等措施,将两次成形改进为一次成形,取得较好的成形效果。通过近3年的批量生产验证,对于宽凸缘中等深度锥形件,通过采取相应的措施,只要保证拉延系数或相对高度的其中一个指标符合要求,即可以有效提高该零件的产品合格率。
According to the forming characteristics of tapered parts with flanges, the process calculation and analysis are carried out according to the stamping forming principle and production experiment of the metal sheet to find out the reasons for the high rejection rate of this type of parts during drawing. The use of relatively low cost 08Al flange cone parts, the choice of hydroforming equipment, the blank holder force adjusted between 195 ~ 260kN, through the die edge ring processing groove, increase plastic sheeting lubrication and other measures will be Improved twice forming a forming, get better forming effect. Through nearly 3 years of mass production verification, for the wide flange conical parts, through the appropriate measures, as long as the guarantee coefficient of drawing or relative height of one of the indicators to meet the requirements, which can effectively improve the product qualification rate of the part .