摘要：论文阐述并研究了中厚板材马鞍形工件的新型渐进折弯的加工方法。与传统方法的冲压成型相比较而言渐进折弯可以使复杂的型面逐道离散化降低加工难度节约成本更可以加工传统冲压方法不易加工的中厚板材。同时提高了生产效率，是一种兼具经济与发展的新型加工方式。首先通将金属材料Q235A的弹塑性材料力学参数导入ABAQUS有限元分析软件中。应用ABAQUS中的单元构建中厚板材马鞍形工件的有限元模型，对中厚板材马鞍形工件的渐进折弯进行模拟。同时对比进给量、凹凸模半径等关键参数对折弯效果的影响，对中厚板材马鞍形工件的渐进折弯凸凹模的成型工艺参数进行优化以取得较好的成型效果。最后完成中厚板材马鞍形工件渐进折弯的工艺规划。43232

毕业论文关键词： 有限元法；渐进成型；马鞍形

Progressive bending forming simulation and die optimization design of the saddle shaped workpiece of medium and heavy plate 

Abstract: Expounded in this thesis studied the medium thickness plate of saddle work piece new gradual bending processing method. Compared with the traditional method of stamping forming for gradual bending can make complex type surface discretization by road, reduce machining cost savings can be more difficult in traditional stamping method which is not easy to processing of thick plate. At the same time improve the production efficiency, is a kind of both economic and environmental of new processing way. First of all, through the metal material of Q235A elastic-plastic mechanics parameters into ABAQUS finite element analysis software. Application in the process of building units in thick plate of ABAQUS finite element model of saddle workpiece and the gradual bending of thick plate saddle workpiece of simulation. Compared to feed at the same time, the key parameters such as concave and convex die radius folded the effects of the bending of thick plate of saddle workpiece in gradual bending intensive molding process parameters optimization in order to obtain good molding effect. Finally complete medium thickness plate saddle workpiece gradual bending process planning. 

Key words: The finite element method; Gradual molding; saddle

目  录

1  绪论  1

1.1  研究背景1

1.2  研究目的及意义1

1.3  中厚板材折弯方法2

1.3.1  整体模具的冲压工艺  2

1.3.2  蒙皮拉形法工艺 2

1.3.3  辊弯成形法工艺  3

1.3.4  多点成型法工艺 3

1.3.5  渐进折弯法工艺 3

1.4  主要指导思想与内容4

2  基本概念和理论基础    5

2.1  板料的成型过程5

2.1.1  弹性变形阶段 5

2.1.2  弹塑性变形阶段 6

2.1.3  纯塑性变形阶段 7

2.2  有限元基础知识 7

2.2.1  ABAQUS软件简介 7

2.2.2  有限单元模型 7

2.2. 3   本构模型  9

2.2.4  各向异性模型9

2.2.5  塑性强化模型10

3  马鞍形渐进折弯的数值模拟12

3.1  材料参数12

3.2  工件形状13

3.3  凹凸模几何结构建模14

3.4  加工道次的确定15

3.5  理想折弯道次的示意15

3.6  选择质量系数20

3.7 模拟结果20

4  马鞍形渐进折弯模具及工艺优化设计23

4.1  误差分析23

4.2  模具优化设计23

4.3  工艺优化设计24

结论28

谢辞29

参考文献30 

1  绪论

1.1  研究背景

正近年来随着我国的经济发展基础建设不断完善，建筑、石油、航运等行业蓬勃发展，带动了金属板材的需求量。尤其伴随着不断增长的进出口贸易额以及建设航运中心对运输船舶的设计制造要求连续提高。为了减少耗油量质量轻且强度高的船体外板被生产企业纳越发看好。