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超塑成形/扩散连接(简称SPF/DB)成形技术是一种高效的整体构件成形技术,是航空航天大型复杂钛合金薄壁结构件制造的主要工艺方法之一。采用板料成形模拟软件PAMSTAMP2G对一种TC4钛合金四层板SPF/DB构件的成形过程进行了数值模拟。根据零件的结构特点,设计加载两条优化的压力—时间曲线。分析了SPF/DB成形过程中材料流动规律和壁厚分布情况。通过实际零件的成形实验,测量零件截面12个关键点厚度值,分别与相对应的模拟结果进行了对比。结果显示,变形过程与厚度符合实际分布规律,最大厚度误差为0.148 mm。
Superplastic forming / diffusion bonding (referred to as SPF / DB) forming technology is a highly efficient integral component forming technology, which is one of the main process methods for manufacturing large-scale complex titanium alloy thin-walled structural parts in aerospace. A sheet forming simulation software PAMSTAMP2G was used to simulate the forming process of a TC4 titanium alloy four-layer SPF / DB member. According to the structural features of the part, two optimized pressure-time curves are designed and loaded. The law of material flow and the distribution of wall thickness during SPF / DB forming process were analyzed. Through the actual part forming experiment, the thickness of 12 key points of the part cross-section was measured and compared with the corresponding simulation results respectively. The results show that the deformation process and thickness are in accordance with the actual distribution law, and the maximum thickness error is 0.148 mm.