U型臂三辊滚弯成形工艺的优化设计+CAD图纸
毕业论文关键词：滚弯成型；三辊卷板机；几何规划；工艺规划；
Optimization design of three roll bending forming process of U type arm
ABSTRACT：Roll Forming is a common sheet metal processing methods. Single pass roll forming curved surfaces only a simple piece of large semi-elliptical piece, single-channel roll bending process is not easy, you need to select the method of multi-pass progressive roll bending processing. First half-elliptical cross-section of the workpiece is discretized, the molding surface of the workpiece geometry is converted to a set of single pass rolling bending parameters, each pass through the feed amount of the sheet material and the roller under the pressure of the displacement value control progressive machining high precision parts. The process of forming a crane jib, bridge arm, pressure piping, pump retractable folding arm, hull plates and other large, medium and small quantities of the new product is very suitable, can significantly reduce product development time and reduce production costs.The design of the main U-shaped bend of the roll forming research arm, the first arm of the U-shaped craft to analyze, select symmetric three roller coiling machine rolling and bending forming symmetric three roller coiling were forming roll bending theory elaborate and theoretical analysis, and then forming a U-shaped arm raised features geometric planning process and develop plans to complete the entire U-arm roll bending process design.
Keywords: Roll bending molding; Three roller coiling machine; Geometric programming; Process planning;
目 录
1 绪论 1
1.1引言 1
1.2辊式卷板机简介 1
1.3对称式三辊卷板机工艺研究现状 3
2 U型臂零件的工艺分析 5
2.1 U型类零件的滚弯原理 5
2.2 U型类零件的滚弯方案选择 6
2.3预弯方案的选择 6
2.4对中 7
2.5对称式卷板机参数的选择 7
2.6预弯理论剩余直边值的计算 8
2.7终弯上辊轴的位置 9
3 滚弯成型的理论分析 10
3.1塑性弯曲 10
3.2塑性弯曲时的应力应变状态 12
3.2.1 应变状态 12
3.2.2 应力状态 12
3.2.3 宽板塑性弯曲时三个主应力的分布性质 13
3.2.4 塑性弯曲中现象的复杂性 15
3.3滚弯加工过程阶段分析 16
3.4回弹的计算 17
4 U型臂的几何规划与滚压工艺设计 19