传统的弯曲工艺由于属于等径弯曲,弯管壁厚存在外侧减薄、内侧增厚的现象.扩径弯曲工艺可以从根本上解决弯管成形中的壁厚不均问题,实现等壁厚,但工艺复杂,成形质量受多种因素影响.高质量钛弯管在要求高强度的同时要求内、外侧壁厚均匀.在理论分析的基础上,进行了高强钛合金热推扩径弯曲试验,研究了成形过程中的金属流动规律,给出了弯曲变形量与扩径量之间的比例关系,制备出了1300MPa级的高强钛合金等壁厚弯管,壁厚相对壁厚公差约为6％.该研究对于钛合金的弯曲加工有一定指导价值.%In the process of conventional bending, the inner-arc side of pipe is always subjected to compress and the outer-arc side is subjected to tension during bending, as a result, non-uniform thickness of the pipe is often produced.The expanding-bending technology is an efficient way to solve this issue. However, this technology has a complex process and the forming quality might be affected by many factors. High quality titanium elbow requires high strength and uniform wall thickness. On the basis of theoretical analysis, the hot expanding-bending technology test of high strength titanium alloy was carried out. The flow law of metal in the forming process was studied. The proportional relationship between the bending deformation amount and the expansion diameter was given. Finally, the uniform thickness of 1300 MPa grade elbow were obtained through the hot expanding-bending technology by means of inducing heating, and the relative wall thickness tolerance of the wall thickness was about 6％. This study is of certain guiding value for the bending process of titanium alloy.
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