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.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
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
关键词
ABAQUS
工件形貌
加热剪切旋压
芯模
旋压力
工件壁厚
ABAQUS
stress
strain
temperature
topography
hot shear spinning
mandrel
spinning force
thickness
