【三维复杂锻造过程数值模拟及直齿轮冷精锻成形研究THERESEARCHON3DCOMPLICATEDFORGINGPROCESSESNUMERICALSIMULATIONANDSPURGEARCOLDFORGINGTECHNOLOGY】寇淑清.pdf

THERESEARCHON3DCOMPLICATEDFORGING PROCESSESNUMERICALSIMULATIONAND SPURGEARCOLDFORGINGTECHNOLOGY Kou Shuqing Tutor:Professor Fu Peifu AcademicDegreeAppliedfor:Doctor of Engineering Speciality:MaterialProcessingEngineering Date of Submission:December,1998 Date of Oral Examination:March 18,1999 Un

吉林工业大学博士研究生学位论文化处理与传递新技术。通过引入二阶正定泛函,以最佳通近控制插值精度、以罚项控制光顺性,保证了全场状态参量的连续性并提高了新旧网格中的传递精度。采用了单元退化准则与边界干涉准则进行网格重分判断.3.齿轮精锻数值模拟分析本文首次将弹塑性大变形有限元数值模拟分析应用于直齿轮冷精锻成形过程中。通过对预锻和各终锻成形过程的有限元数值模拟,获得各变形阶段的网格变形图和力学量场分布,揭示了齿轮精锻过程中的变形规律,对成形过程中诸多影响因素如摩擦因素、终锻中坏料与模具的间隙、预锻充满程度及终锻分流措施等进行了分析.4.

吉林工业大学博士研究生学位论文 proving generality of the software and contact searching,B-spline function is used to describe curved surfacess.As the same time,a library of geometry parts and algorithm of smoothing piece-together to ensure Ccontinuity are builtforuptool descriptionbyspecialcurvedsurfaceequations.