锻压技术

基于悬臂梁解析的管材自由弯曲加载曲线优化研究

英文标题：Optimization research on free bending loading curve for pipe based on cantilever beam analysis

单位：1.中国航空制造技术研究院 2.塑性成形技术航空科技重点实验室 3.航空工业第一飞机设计研究院

分类号：TG386

出版年,卷(期):页码：2023,48(12):138-142

摘要：

自由弯曲成形技术通过同时控制管材的轴向推进及弯曲模的运动实现了复杂轴线导管的成形。通过自由弯曲成形过程分析和弹塑性变形理论，并结合成形区悬臂梁形状的假设，探讨了管材自由弯曲工艺中成形区的控制方程，推导得到基于成形区悬臂梁形状假设的弯曲工艺参数（位移和转角）与成形特定曲率半径的函数关系。此外，针对GH4169高温合金导管自由弯曲成形过程进行了有限元数值模拟，对比了基于圆弧解析和悬臂梁解析的加载曲线成形的导管形状，表明基于悬臂梁解析的加载曲线的成形尺寸更接近设计尺寸。最后，分析确定了弯曲模转角是造成上述两种加载曲线差异的原因，悬臂梁解析加载曲线中的转角与当前弯曲导管的形状和弯曲模的位移相协调。

Free bending technology can realize the forming of conduits with complex axis by simultaneously controlling the axial propulsion of pipe and the movement of bending die. Therefore, through the analysis of free bending process and the theory of elastic-plastic deformation, combined with the assumption of cantilever beam shape in the forming area, the control equation of the forming area in the free bending process of pipe was discussed, and the function relationship between the bending process parameters (displacement and rotation angle) based on the assumption of cantilever beam shape in the forming area and the specific curvature radius of forming was derived. Furthermore, the free bending process of superalloy GH4169 conduits was numerically simulated by finite element software, and the shapes of the conduits formed based on the arc analytical and cantilever beam analytical loading curves were compared. It is shown that the formed is closer to the design size based on the cantilever beam analytical loading curves. Finally, it is determined that the bending die rotation angle is the reason for the difference in the above two loading curvatures, and the rotation angle in the cantilever beam analytical loading curve is coordinated with the shape of the current bent conduit and the displacement of the bending die.

基金项目：

徐鑫良（1985-），男，硕士，高级工程师 E-mail：xuxinl@qq.com

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