采用低熔点塑性材料作为传力介质挤胀成形厚壁空心构件,研究了空心构件低熔点塑性介质挤胀成形机理和主要影响因素,分析了低熔点塑性介质挤胀管坯的成形过程和壁厚分布规律.研究结果表明:低熔点塑性介质挤胀成形时管坯和塑性介质两种材料同时发生塑性变形,管坯的变形流动是塑性介质的内压和冲头轴向挤压共同作用的结果;轴向压力和径向内压力的匹配关系是低熔点塑性介质挤胀成形工艺的关键;管坯胀形区的壁厚有较大的减薄,但与自然胀形相比壁厚减薄的程度较小.
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