锻压技术

双金属复合管冷轧层间撕裂缺陷形成机理分析

英文标题：Analysis on the tearing principle between layers of the cold rolled bi-metal composite pipe

作者：孔陈梅廖宏谊

单位：桂林电子科技大学

分类号：TG335.71；TG335.85

出版年,卷(期):页码：2016,41(10):142-148

摘要：

针对嵌套热挤压工艺生产的冶金结合双金属复合管坯在冷轧过程中发生层间撕裂缺陷的问题，对缺陷产生的机理进行了理论分析，结果发现，当结合界面剪应力值大于界面结合强度时冷轧过程中就会发生层间撕裂缺陷。推导了复合管冷轧过程中界面剪应力的计算公式，即可通过计算内外层管的轴向应力差得到。以304L/20G为例进行了理论计算，并用ABAQUS有限元软件分别模拟内外层单金属管坯的冷轧过程，得出界面剪应力值，模拟结果、理论计算和生产实际基本一致，说明本文提出的计算界面剪应力的方法可行。最后，基于分析提出了避免缺陷产生的工艺改进措施。

For the problem of interlayer tearing defects existed in the cold rolling process of bi-metal composite pipe, the mechanism of defects were analyzed theoretically, and it was found that when shear stress value in combined with the interface was greater than the interface bonding strength in the process of cold rolling, interlayer tearing defects appeared. Then, the calculation formula of shearing force at interface between layers were deduced and given by the calculation of axial stress difference of inside and outside layer tube. For 304L/20G, theoretical calculation was carried out, and the rolling process of inside and outside pipes was simulated numerically by ABAQUS software. Furthermore, the stress of shearing was achieved and the calculation results, theoretical results and actual production were basically the same. Thus, the calculation method of interface shear stress was feasible. At last, improved processes to avoid defect were given based on analyzing the measures.

基金项目：

邯郸市科学研究与开发项目（1521102055）

孔陈梅（1990-），女，硕士研究生 E-mail：chenmkong@163.com

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