Research on Single Point Incremental Forming Force under Isostatic Pressure Support
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摘要: 在单点增量成形过程中,板料背面悬空不受任何支撑,仅依靠工具头和板料之间的挤压作用对板料进行无约束成形,易造成板料成形精度不高。本文提出了一种等静压支撑单点增量成形新技术,在成形过程中为板料提供有效支撑。以1060铝板为研究对象,分析等静压参数对成形力的影响规律。结果表明:静压支撑单点增量成形,水平方向的力Fx和Fy较传统的单点增量成形有一定的增加,但增加幅度不大,轴向力Fz变化比较大,随着静压的不断增加,轴向力不断增大。设计开发静压系统,通过实验验证,获得静压条件下成形力的变化规律,并验证了仿真的正确性。Abstract: In the single-point incremental forming process, the back side of the sheet metal is not supported by any support, and the sheet metal is unconstrained between the tool head and the sheet metal, which is easy to cause the sheet forming precision to decrease. A new technique for isostatic pressing support in single point incremental forming is proposed, which provides the effective support for the sheet metal in the forming process. The influence law of the isostatic pressure parameters on the forming force of 1060 aluminum plate was analyzed. The results show that the single-point incremental forming of static pressure support has a certain increase in the force of Fx and Fy in the horizontal direction being compared with the traditional single-point incremental forming, but the increase is not large, and the axial force Fz changes greatly. As the static pressure increases, the axial force increases. The static pressure system was designed and developed, and the variation of the experimental forming force under static pressure was obtained, and the correctness of the simulation was verified.
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表 1 网格划分、材料模型选择、接触条件及边界条件定义
网格
划分工件 网格类型:S4R 单元数量:19600 工具头 解析性钢体 材料
模型
选择工件 壳体金属塑性模型, 1060铝板(弹性
模量为70 GPa, 泊松比为0.3,
密度为2.71×103 kg/m3)工具头 材料为硬质合金, 直径为10 mm 接触条
件定义工具头与板料接触类型:面-面接触 边界条
件定义工件 约束其表面6个自由度 工具头 绕板料旋转, 转速为700 r/min 表 2 1060铝材料应力应变属性
应力/MPa 20 44 64 77 87 91 98 应变 0.002 0.0169 0.0507 0.0845 0.1183 0.1352 0.169 -
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