铝合金弹性预应力超声喷丸成形试验

发布时间：2018-10-25 15:49

【摘要】：超声喷丸作为一种新型的板料成形技术,具有易操作,能耗少及优良成形性能等优点,广泛应用于板料成形中。但自由状态下,超声喷丸成形也易发生球面变形,因而提出了弹性预应力超声喷丸成形方法,以2024-T351铝合金壁板为研究对象,分析预弯力矩大小、成形轨迹和壁板厚度对成形曲率半径及成形性能的影响。试验中通过控制壁板展向的弯曲曲率来实现弹性预弯。结果表明:预应力超声喷丸能够大幅度减小壁板展向的成形曲率半径,同时增大弦向成形曲率半径,且随着预弯曲率半径的减小,这种减小和增大的效应随之逐渐增大。此外,与自由状态相比,预应力超声喷丸能够产生幅度和深度更大的残余压应力场,且表面粗糙度并未随着预弯曲率的增大而增加。分析认为,弹性预应力超声波喷丸能够进一步提高受喷材料的成形曲率并在一定程度上减小球面变形趋势,对大变形大厚度的单曲率零件成形具有重要的意义。
[Abstract]:As a new type of sheet forming technology, ultrasonic shot peening is widely used in sheet metal forming because of its advantages of easy operation, less energy consumption and good forming performance. However, ultrasonic shot peening is prone to spherical deformation in free state, so an elastic prestressing ultrasonic shot peening method is proposed. The pre-bending moment of 2024-T351 aluminum alloy panel is analyzed. The influence of the forming path and the thickness of the wall plate on the radius of curvature and the forming performance. In the experiment, the bending curvature of the wall plate is controlled to realize the elastic prebending. The results show that prestressing ultrasonic shot peening can greatly reduce the radius of curvature of the spanned shape and increase the radius of curvature of the chordal shape. With the decrease of the radius of prebending curvature, the effect of the decrease and increase is gradually increased. In addition, compared with the free state, prestressing ultrasonic shot peening can produce a larger amplitude and depth of residual compressive stress field, and the surface roughness does not increase with the increase of prebending ratio. The analysis shows that the elastic prestressing ultrasonic shot peening can further improve the forming curvature of the materials to be sprayed and reduce the deformation trend of the spherical surface to a certain extent, which is of great significance for the forming of single curved parts with large deformation and large thickness.
【作者单位】：南京航空航天大学机电学院;航空工业西安飞机工业(集团)有限责任公司;
【基金】：国家自然科学基金(51175257) 江苏省第九批六大人才高峰资助(ZBZZ-032)~~
【分类号】：TG66

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