离散夹钳柔性拉形机的研制及实验验证

Development and Experimental Verification for Flexible Stretch Machine with Discrete Clamp

针对整体平夹钳拉形机横拉时工件不易贴模和可调曲夹钳拉形机纵拉时人工调形夹钳费时费力的问题,提出一种离散夹钳柔性拉形的方法。从"离散化控制"的视角剖析离散夹钳柔性拉形机的工作机制和构造特征,并采用有限元方法对不同数量的离散夹钳和夹钳结构形状对拉形件的应变分布、板厚变化和夹持面形状进行了数值模拟研究,最后采用自制的离散夹钳拉形机对球形件进行了相关工艺的实验验证。结果表明:离散夹钳柔性拉形机成形的工件质量满足生产要求,实验结果与数值模拟的结果基本吻合。

To solve the problem that the parts was not easy to be molded when the integral clamping machine was pulled horizontally and problem of time-consuming and laborious manual stretching clamp when the adjustable clamping machine was pulled longitudinally,a flexible stretching method of discrete clamp was proposed.From the viewpoint of "discrete control",the working mechanism and structural characteristics of the flexible stretch forming machine with discrete clamps were analyzed.The strain distribution,thickness variation and clamp surface shape of the parts were numerically simulated by finite element method with different number of discrete clamps and clamp structure shapes.At last,the relevant process of spherical parts was verified by the self-made discrete clamp stretching machine.The quality of forming parts by flexible stretch forming machine with discrete clamp meets the requirements of production.The experimental results are in good agreement with the numerical simulation results.