【作者】 周强；

【导师】 詹梅；

【作者基本信息】 西北工业大学 ， 材料加工工程， 2007， 硕士

【摘要】 高强度、高精度的突变壁厚锥形件强力旋压是适应航空、航天和兵器工业的发展需要而出现的一种新工艺。了解和掌握突变壁厚锥形件强力旋压成形机理及规律是研究和发展该技术迫切需要解决的关键问题。本文以弹塑性力学为基础，将试验研究和有限元模拟技术相结合，研究了突变壁厚锥形件强力旋压的变形机理和规律。主要研究内容和结果如下： 基于弹塑性显式有限元平台ABAUQS／Explicit，建立了既符合实际又兼顾计算精度和效率的突变壁厚锥形件强力旋压的三维弹塑性动态显式有限元模型。该模型的建立，为研究突变壁厚锥形件强力旋压成形机理及工艺参数对其成形过程的影响规律奠定了基础。 基于上述模型，研究获得了突变壁厚锥形件强力旋压过程中应力和应变的分布与变化特征：旋轮作用区是典型的三向压应力状态；除旋轮作用区外，其余区域沿圆周方向均受拉应力；在法线方向，已成形区和未成形区都受到压应力作用。旋轮前方母线方向的压应变近似呈环形，应变值逐渐减小；旋轮作用区出现一个周向拉应变环，该区域的拉应变值在成形薄壁区过程中逐渐减小，而在成形厚壁区过程中先增大后减小：旋轮前方存在一个法向拉应变环，随成形进程，该区域的拉应变值先增大后减小。 进而研究获得了旋轮圆角半径和坯料半锥角对突变壁厚锥形件强力旋压成形的影响规律：随着随旋轮圆角半径的增加，在旋轮作用区产生的压应变环带的宽度增加，其应变值增加，有利于突变壁厚锥形件旋压过程中厚壁区金属的填充。随着坯料半锥角的增加，薄壁区的母线方向的拉应变值逐渐减小，而厚壁区母线方向的压应变值增加；已成形区产生法向压应变的区域和压应变的值都在增加。因此，初始半锥角的增加对突变壁厚锥形件强力旋压成形是有利的。 在突变壁厚锥形件强力旋压成形过程中的应力应变分布规律和旋轮圆角半径和坯料半锥角对突变壁厚锥形件强力旋压成形的影响规律的研究基础上，设计制造了相应的模具，进行了相应的工艺试验，得到了填充质量良好的突变壁厚锥形件强力旋压样件。更多还原

【Abstract】 The advent of the spinning of high-strength and high-precision cone parts with discontinuous wall thickness adapt to the increasing demand of aeronautic, aerospace and military industry. Research on the deformation mechanism and deformation laws of the power spinning of cone parts with discontinuous wall thickness is a key problem urgently to be solved for the research and development of the technology. In the dissertation, based on elasto-plasticity mechanics, using experiments and finite element method (FEM), the mechanism and law of spinning of discontinuous wall thickness have been a brief introduction to the project and its main results are as follows:At first, based on the elasto-plastic dynamic FEM platform ABAQUS/Explicit, a 3D FEM model of the power spinning of cone parts with discontinuous wall thickness has been developed. The establishment of the model lays a foundation for the research on the deformation mechanism and the influencing laws of forming parameters on the process.Second, based on the model established above, the distribution and variation features of the stress and strain during the process have been obtained. During the forming process, a typical three-dimensional compression stress zone lies in the place contacting with roller; The hoop tension stress lies in other zones. The normal compressive stress lies in the formed place and unformed place. In front of the roller, the generatrix compressive strain appears a ring, and its value decreases; a hoop tension strain ring lies in the place contacting with roller, the tension strain value reduces when the thin wall zone formed, the value increases at first and then reduces when the thick wall zone formed. In front of the roller, there is a normal tension strain ring, and its value increases in the former stage and reduces again with the process.Third, the influence laws of the roller radius and the hemicone angle, on the power spinning of cone parts with discontinuous wall thickness have been revealed. The results show that: the increase of the roller radius, the compressive strain ring lies in the place contacting with roller and its value grows up; the increase of the hemicone angle, the value of tension strain decreases while the thick wall zone formes and it更多还原