轴对称件三点渐进成形理论和实验研究

发布时间：2018-07-09 10:19

本文选题：三点成形 + 等效模型　；参考：《中南大学学报(自然科学版)》2015年05期

【摘要】：针对单点渐进成形精度不高的问题,从控制变形角度,提出一种围绕对顶主成形头设置对顶辅助工具头以缩小变形域、限制二次变形和回弹、有效提高成形精度的三点渐进成形新工艺。为了寻找加工过程中塑性应变的变化规律以指导加工路径规划和成形工艺参数设计,基于轴对称件三点成形等高线加工轨迹的特点,提出并建立等效加工层模型。利用力学方程和平面应变条件,求得加工层的等效虚拟应力应变。研究结果表明:轴对称圆盘件成形的数值仿真和实验结果与理论解相一致,所建等效模型及理论分析的有效性和所提三点渐进成形控制变形及提高精度具有可行性。
[Abstract]:Aiming at the problem that the precision of single point progressive forming is not high, from the angle of controlling deformation, this paper puts forward a kind of tool head to narrow the deformation domain and limit the secondary deformation and springback. A new three-point incremental forming process to improve the forming accuracy effectively. In order to find out the variation rule of plastic strain in machining process to guide the planning of machining path and the design of forming process parameters, an equivalent machining layer model was put forward and established based on the characteristics of the contour of three-point forming of axisymmetric parts. The equivalent virtual stress and strain of the machined layer are obtained by using the mechanical equation and plane strain condition. The results show that the numerical simulation and experimental results of axisymmetric disc forming are in agreement with the theoretical solution. The effectiveness of the equivalent model and theoretical analysis and the feasibility of the proposed three-point incremental forming control deformation and improve the accuracy.
【作者单位】：浙江工业大学特种装备制造与先进加工技术教育部&浙江省重点实验室;杭州师范大学钱江学院;
【基金】：国家自然科学基金资助项目(50075083) 浙江省自然科学基金重点资助项目(LZ12E05003) 浙江省科技厅重大科技专项重点工业项目(2012C01012-4) 浙江工业大学重中之重开放基金资助项目(56310203039)~~
【分类号】：TG306

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