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板料的成型极限一直是板料加工研究工作者的一个重要研究课题,对生产实际有重大的指导意义。本文就超塑金属薄板的自由胀形进行了极限分析,绐出了胀形极限与材料参数和工艺参数之间的关系,并且讨论了提高胀形极限的最佳加压规律。Z_—27.4l薄板的自由胀形实验对分析结论给出了令人满意的验证结果。
The forming limit of sheet metal has always been an important research subject of sheet metal processing research workers and has great guiding significance for the actual production. In this paper, the limit analysis of the free bulging of superplastic sheet metal has been carried out. The relationship between the bulging limit and the material parameters and the process parameters has been deduced. The optimal pressurization law to increase the bulging limit has also been discussed. The experiment of free bulging of Z_-27.4l sheet gives satisfactory results.