热剪切旋压过程中芯模对零件形貌和壁厚分布的影响  

Effects of Mandrel on Hot Shear Spinning of Titanium Alloy

作　　者：詹梅[1] 李甜[1] 王巧玲[1] 杨合[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《西北工业大学学报》2013年第3期491-497,共7页Journal of Northwestern Polytechnical University

基　　金：优秀青年科学基金(51222509);国家863计划(2008AA04Z122);国家自然科学基金(50405039)资助

摘　　要：为了揭示芯模对钛合金加热剪切旋压成形的作用机制,采用数值模拟方法,对比分析了贴模和不贴模加热剪切旋压件的形貌以及壁厚分布。结果表明:成形前期,二旋压件的平直度和锥度均较好,成形中后期(65%)后,不贴模旋压件母线会塌陷。工件在变形区的壁厚减薄由纯剪切变形和拉伸变形共同作用产生,且纯剪切变形起主导作用。贴模旋压件壁部壁厚较均匀,而不贴模旋压件的波动较大,呈现中部小两端大的趋势。成形中后期的母线塌陷使得不贴模旋压件壁厚减薄不足,因此其靠近凸缘部位的壁厚远大于该区域贴模旋压件的壁厚。为了提高不贴模旋压件的直线度和锥度,不贴模旋压过程中需要对工件凸缘施加约束以防止母线的塌陷,或预先通过设定合适的旋轮轨迹进行塌陷补偿。In order to disclose the effects of mandrel on the hot shear spinning of titanium alloy,the differences of topography and thickness distribution of contour spinning parts from those of non-contour spinning parts were analyzed.Subsection 1.1 of the full paper improves the finite element model of Ref.14.Subsection 2.1 analyzes the differences of topography.Fig.4 through 7 give differences of various distributions,which include thickness distributions at various stages of spinning process.The above-mentioned differences and their analysis show preliminarily that：（1） the linearity and taper of each workpiece is excellent at early stage of spinning process;however,the caving in the generatrix of mandrel occurs for non-contour spinning,thus the cone angle of generatrix is less than the designed value;（2） the thickness reduction at deforming area is the combined action of pure shear deformation and tensile deformation,and the former is predominant;（3） the thickness of the workpiece spun by contour spinning distributes uniformly,but for non-contour spinning the thickness of the workpiece fluctuates along generatrix and an obvious under-thinning occurs at the final stage;（4） for non-contour spinning process,proper roller path or constraints at the location of flange is necessary to avoid the caving in and reduction of cone angle.

关 键 词：ABAQUS 工件形貌 加热剪切旋压 芯模 旋压力 工件壁厚 

分 类 号：TG389[金属学及工艺—金属压力加工]