模具与管材不同配合条件下中强TA18厚壁钛管数控弯曲变形行为  

Deformation behaviors of medium-strength TA18 thick-walled tubes during NC bending under various contact conditions between tube and dies

作　　者：江志强[1] 杨合[1] 詹梅[1] 许旭东[2] 李光俊[2] 

机构地区：[1]西北工业大学材料学院,凝固技术国家重点实验室,西安710072 [2]成都飞机工业(集团)有限公司,成都610092

出　　处：《塑性工程学报》2011年第1期21-27,共7页Journal of Plasticity Engineering

基　　金：教育部新世纪优秀人才计划资助项目(NCET-08-0462);凝固技术国家重点实验室(西北工业大学)自主研究课题资助项目(KP200919)

摘　　要：采用基于ABAQUS建立的中强TA18钛合金厚壁管数控弯曲有限元模型,研究了不同配合参数条件下中强TA18钛合金厚壁管数控弯曲过程中的壁厚变化和截面扁化行为,确定了适合于中强TA18厚壁管数控弯曲的压力模、弯曲模与管材间隙和摩擦的选取原则。结果表明,压力模和弯曲模与管材的间隙,对壁厚增厚率的影响较减薄率的影响显著,过大的压力模与管坯间隙会造成内侧小凸包缺陷,过大的弯曲模与管材间隙会造成外侧壁的严重塌陷。因此,弯曲模和压力模与管材的间隙应取较小的值;压力模和弯曲模与管材间的摩擦,对壁厚变化和截面扁化影响不大,因此,压力模和弯曲模与管材间可选用航空润滑油或拉深油进行润滑。The deformation behaviors of the wall thickness variation and cross-sectional flattening in the NC bending of mediumstrength TA18 thick-walled tubes under different contact conditions between tube and dies were investigated using a 3D elasticplastic finite element model established based on ABAQUS. The election principles of the friction and the clearance between pressure die or bending die and tube in NC bending of a medium strength TA18 tubes were determined. The results show that： the effects of the clearance between pressure die or bending die and tube on the thickening ratio is larger than that on the thinning ratio. A larger clearance between the pressure die and tube will lead an inside bulge to occur, and a larger clearance between the bending die and tube will make a severe inward collapse of outside wall. Therefore, the clearance between pressure die or bending die and tube should decrease as soon as possible. The effects of the friction between pressure die or bending die and tube on the variations of wall thickness and cross section in NC bending of TA18 tubes is small, thus aviation lubricating oil or draw oil can be used to lubricate the interface between pressure die or bending die and tube.

关 键 词：配合参数 中强TA18钛合金 厚壁管 壁厚变化 截面扁化 数值模拟 

分 类 号：TG386.43[金属学及工艺—金属压力加工]