锻压技术

基于数字散斑相关法的管材胀形轮廓方程的构建

英文标题：Constructing curvilinear equation of bulging profile for tube based on digital speckle correlation method

作者：刘建伟刘心宇杨连发胡国林贾慧杰

单位：桂林电子科技大学中南大学

分类号：

出版年,卷(期):页码：2014,39(4):31-35

摘要：

在液压胀形中，为了解决管材流动应力关系构建中胀形参数求解难的现状，实现变形参数的在线、全场、非接触测量，提出了基于数字散斑相关法获取管材胀形参数方法。首先，描述了数字散斑相关法的基本原理及应用。然后，利用三维数字散斑动态应变测量分析系统和自行开发的管材自然胀形装置，分别对304不锈钢和H62黄铜管材进行了多组内压力的液压自然胀形试验，并在线获取了管材在各组内压下的变形参数，该系统变形测量精度为0.001 mm。最后，通过点云生成、三维重构、母线提取，获得各组内压力下的管材胀形轮廓方程。将所得结果与测量求解法结果的比较，相对误差均在10%之内，表明这两种求解方法具有较好的一致性，能满足管材胀形参数求解的要求。

In order to obtain the curvilinear equation of bulging profile in constitutive relation and realize convenient measurement, a novel approach, which is an on-line and non-contact measurement, was proposed based on digital speckle correlation method. At first, the DSCM basic principle and application were introduced in brief. Then, a simple and practical tooling, including an apparatus of tube hydroforming and a 3D digital speckle analysis system whose measurement accuracy was 0.001 mm, was introduced. Free-bulged tests were performed for 304 stainless steel and H62 brass alloy tubes at several internal pressure levels, and deformation parameters were output from the measuring system. The equation of bulging profile for tube at several internal pressure levels was obtained by means of point cloud building 3-D reconstructing and generatrix extracting. Compared with direct measurement method, the relative error is less than 10%. The results show that the developed approach is acceptable to define the bulging profile parameter of tube.

基金项目：

国家自然科学基金资助项目（51065006，51271062）；广西自然科学基金资助项目（2013GXNSFBA019245）

刘建伟(1978-)，男，博士研究生，高级实验师

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