薄壁管小弯曲半径数控绕弯成形芯模效用的实验研究  

Experimental study on role of mandrel in thin-walled tube NC bending process with small bending radius

作　　者：申世军[1] 杨合[1] 李恒[1] 詹梅[1] 

机构地区：[1]西北工业大学材料科学与工程学院,西安710072

出　　处：《塑性工程学报》2007年第4期29-34,共6页Journal of Plasticity Engineering

基　　金：国家杰出青年科学基金资助项目(50225518);国家自然科学基金资助项目(59975016;50175092);航空科学基金资助项目(04H53057);西北工业大学本科毕业论文重点扶持项目资助

摘　　要：薄壁管数控弯曲中带芯头的柔性芯模是提高薄壁管件成形极限和成形精度的关键因素。文章建立了绕弯过程芯模(包括芯棒和芯头)的理论解析模型,包括了芯模直径d、芯棒伸出量e、芯头个数n、芯头厚度k、芯棒/芯头孔心间距p及芯棒圆角半径r等参数的选取公式的推导,获得了不同弯曲规格下的芯模参数取值范围,验证了解析模型的合理性;实验研究了芯模参数对管材失稳起皱、壁厚减薄和截面畸变的影响规律。通过分段抽芯的工艺方法,完成了38mm×1mm×38mm(1D)高难度不锈钢管件的弯曲。The mandrel （including flexible balls） is the key to improving the forming limit and forming precision in thin-walled tube NC bending process. In the study, one analytical model of mandrel （including mandrel shank and balls） has been developed and reference formulas have been deduced in order to select the mandrel parameters preliminarily, i. e. mandrel diameter d, mandrel extension e, number of balls n, balls thickness k, space length between balls p and nose radius r. The experiment has been carried out to verify the analytical model. Then the influence laws of mandrel parameters on wrinkling insatiability, wall thickness change and cross section distortion degree are investigated by experiment. The stepped retraction method is used to form the high difficult stainless steel tube with φ38mm×1mm×38mm（1D）.

关 键 词：薄壁管 数控弯曲 芯模 小弯曲半径 实验研究 

分 类 号：TG386.43[金属学及工艺—金属压力加工] TG386.31