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首页> 外文期刊>Journal of Mechanical Science and Technology >Formability and forming force in incremental sheet forming of AA7075-T6 at different temperatures
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Formability and forming force in incremental sheet forming of AA7075-T6 at different temperatures

机译：不同温度下AA7075-T6增量板形成的可成型性和成型力

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摘要

The AA7075-T6 sheet recently received attention, owing to its low weight and strength for use fabricating automotive parts (e.g., body, motor case). Owing to its low ductility and high strength at room temperature, it is difficult to form; a heating process is required. In this paper we investigate the mechanical properties of a 1.0-mm-thick AA7075-T6 sheet at different temperatures via an uniaxial tensile test, examining the forming characteristics of incremental sheet forming (ISF) at different temperatures. In the ISF experiment, a sheet clamped on a fixed die was heated and maintained at the designed temperature. The forming force was measured by an in situ force monitoring system. The forming parameters included tool diameter, vertical step, temperature, and feed speed. Vertical step and temperature were selected at three levels for experimental design. The formability was evaluated by varying the shapes of wall-angle conical frustums. When the temperature increased to 200 degrees C, the formability increased dramatically. The fracture-forming limit curve in ISF was defined for this material at different temperatures. This fracture criterion was loaded into ABAQUS software to predict fracture. The comparison between experimental and finite-element method simulation shows good agreement.
机译：AA7075-T6纸张最近受到了注意力，由于其使用制造汽车部件（例如，身体，电机盒）的重量和强度而受到重量和强度。由于其在室温下的低延展性和高强度，因此难以形成;需要加热过程。在本文中，我们通过单轴拉伸试验研究了在不同温度下的1.0mm厚的AA7075-T6片材的机械性能，检查了不同温度下的增量片成形（ISF）的成形特性。在ISF实验中，在设计温度下加热并保持在固定管芯上夹紧的片材。通过原位力监测系统测量成力。形成参数包括刀具直径，垂直步长，温度和进料速度。在三个水平下选择垂直步骤和温度以进行实验设计。通过改变壁角圆锥形截肢的形状来评估可成形性。当温度增加到200摄氏度时，成形性显着增加。在不同温度下为该材料定义ISF中的骨折形成限位曲线。该骨折标准装载到ABAQUS软件中以预测骨折。实验和有限元方法模拟之间的比较显示了良好的一致性。

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