China Mechanical Engineering

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Research on FLC in CNC Single Point Incremental Forming of Aluminum Sheets

HOU Xiaoli;LI Yan;YANG Mingshun;BAI Lang;SHI Xun;ZHANG Chengxing   

  1. School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an,710048
  • Online:2020-04-25 Published:2020-06-11

铝板数控单点渐进成形的成形极限曲线研究

侯晓莉;李言;杨明顺;柏朗;石珣;张成兴   

  1. 西安理工大学机械与精密仪器工程学院,西安,710048
  • 基金资助:
    国家自然科学基金资助项目(51475366,51575443)

Abstract: When CNC single point incremental forming of thin-walled complex components was carried out, sheet metal was prone to cracking, wrinkling and other defects, and the evolution of material deformation mechanism was complex, which was very sensitive to loading conditions. It was difficult to predict and control the fracture of sheet metals in CNC single point incremental forming. Therefore, 1060 aluminum sheet was selected as the research material, and the forming performance of the sheet metals in CNC single point incremental forming technology was studied experimentally to realize the prediction and control of fracture. Spatial deformation of parts was transformed into plane deformation by rubbing method. The grid data of rubbing parts were measured and extracted by digital microscope. The data were fitted by interpolation method and polynomial fitting method. Finally, the FLC in CNC single point incremental forming of 1060 aluminum sheets was obtained. The strain distributions in the break area and safe area were obtained by analyzing the FLC. The prediction and control of the rupture for the workpieces were realized. In order to further improve the forming limit of 1060 aluminum sheets, ultrasonic vibration was introduced into single point incremental forming. The FLC of ultrasonic vibration assisted incremental forming and traditional incremental forming were compared by tests. The testing results show that the forming limit of 1060 aluminum sheet increases by 11% when the vibration power is as 120 W and the vibration frequency is as 25 kHz.

Key words: fracture prediction and control;CNC single point incremental forming;1060 aluminum sheet, forming limit curve(FLC);ultrasound vibration

摘要: 对薄壁复杂构件进行数控单点渐进成形时,板料易发生破裂、起皱等缺陷,且材料变形机制演化复杂,对加载条件极为敏感,使得板料在数控单点渐进成形时的破裂预测和控制变得极难。为此,选取1060铝板作为研究材料,通过试验研究了数控单点渐进成形技术中板料的成形性能,以实现对破裂的预测和控制。利用拓印法将制件的空间变形问题转化为平面变形问题,采用数码显微镜对拓印的制件网格数据进行测量和提取,选用插值法和多项式拟合法对数据进行拟合处理,最终得到了1060铝板料在数控单点渐进成形技术下的成形极限曲线(FLC)。通过对FLC进行分析研究,得到了制件破裂区和安全区域的应变分布,实现了制件破裂的预测和控制。为进一步提高1060铝板的成形极限,将超声振动引入到单点渐进成形中,通过试验对比研究了超声振动辅助渐进成形的FLC和传统渐进成形的FLC,试验结果表明:当振动功率为120 W、振动频率为25 kHz时,1060铝板料的成形极限提高了11%。

关键词: 破裂预测和控制, 数控单点渐进成形, 1060铝板, 成形极限曲线, 超声振动

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