不锈钢-碳钢层合板激光弯折区增厚现象研究  

Study on Thickening of Laser Bending Zone for Stainless Steel-Carbon Steel Laminated Sheet

作　　者：马绪鹏[1] 王续跃[1] 徐文骥[1] 郭东明[1] 

机构地区：[1]大连理工大学机械工程学院精密与特种加工教育部重点实验室,辽宁大连116024

出　　处：《中国激光》2014年第8期64-71,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51375073;50975041)

摘　　要：不锈钢-碳钢层合板经激光快速加热弯曲后,弯折区出现增厚现象。借助IPP图像处理软件测量各层厚度及碳钢层晶粒尺寸,基于温度梯度机理分析弯折区增厚机理及规律。研究结果表明:不锈钢层合板在加热过程中晶粒生长,尺寸增大,产生热膨胀增厚;正向弯曲过程中,晶粒在弯曲应力作用下挤压伸长,产生挤压增厚,在二者的共同作用下,板材厚度增加,且热膨胀增厚占主导地位。增厚现象主要出现在上层不锈钢及碳钢层,碳钢层增厚值所占比重大于69%。最后,研究功率、扫描速度、扫描次数、离焦量等能量参数对增厚值的影响规律,为提高激光弯曲精度与质量提供理论和实验依据。The bending zone thickening of the metal sheet becomes bigger after laser bending. IPP image processing software is the measure tool of the thickness and the grain size. Then rely on temperature gradient mechanism （TGM） to research the thickening mechanism. The results show that the grain size becomes bigger in the heating process which means thermal expansion thickening （TET）. In the positive bending process grains are squeezed and extended by the bending stress and forming extrusion thickening （ET）. TET and ET are the principal factors of thickening appearance, and TET occupies the main position. The stainless steel layer and the carbon layer become thicker, and the thickened value of the carbon layer at least account for 69%. At last, the relation between the energy parameters （ie. power, scanning speed, scanning frequency and defocusing amount） and the thickened value is studied, which are the basis of theory and experiment for better bending mould and quality.

关 键 词：激光技术 层合板 温度梯度机理 热膨胀增厚 挤压增厚 

分 类 号：TG161[金属学及工艺—热处理] TN249[金属学及工艺—金属学]