金属扇形层合板激光圆弧扫描变形特征研究
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摘要
针对不锈钢-碳钢扇形层合板,采用激光同心圆弧扫描方式进行弯曲成形试验。用激光扫描仪对变形后的样件进行几何特征测量,分析激光扫描线各位置的弯曲角度及扫描线两侧曲面变形特征。研究激光加工参数和板材几何参数对扇形层合板激光圆弧扫描弯曲成形的影响。结果表明:经激光圆弧扫描后的扫描线变形区在空间呈三维曲线状,在扫描线处的弯曲角度各不相同,中线位置角度最小,并向板材左右两侧逐渐增大,于板材边缘处达到最大,关于扇形板中心线基本对称;扫描线径向两侧均产生明显曲面变形,扫描线至扇形板外圆线的区域沿y轴正向内凹,扫描线至扇形板内圆线的区域沿z轴正向外凸。研究结果为深入分析激光同心圆弧扫描三维变形机理提供试验依据。
For stainless steel-carbon steel sector laminated plates, the laser concentric circular scanning method was used to bend the plates. The geometrical characteristics measurement of deformed sample were measured by laser scanner. The bending angle of each position of the laser scanning lines and the deformation characteristics of the curved surface on both sides of the scanning line were analyzed. The effects of laser processing parameters and sheet geometry parameters on laser arc scanning bending of sector laminates were studied. The results show that deformation zone of the scanning line after laser circular scanning is three-dimensional curve in space and the bending angles at the scanning line are different. The angle in central line is the smallest and increases gradually to the left and right sides of the plate, reaching the maximum at the edge of the plate. The angle is basically symmetrical along the center line of the plate; The surface is obviously deformed by a curved surface and the area from the scanning line to the outer circular line of the sector plate is inwardly recessed, and the area from the scanning line to the inner circular line of the sector plate is convex outward. The research results provide a basis for in-depth understanding of the three-dimensional deformation mechanism of laser circular scanning.
For stainless steel-carbon steel sector laminated plates, the laser concentric circular scanning method was used to bend the plates. The geometrical characteristics measurement of deformed sample were measured by laser scanner. The bending angle of each position of the laser scanning lines and the deformation characteristics of the curved surface on both sides of the scanning line were analyzed. The effects of laser processing parameters and sheet geometry parameters on laser arc scanning bending of sector laminates were studied. The results show that deformation zone of the scanning line after laser circular scanning is three-dimensional curve in space and the bending angles at the scanning line are different. The angle in central line is the smallest and increases gradually to the left and right sides of the plate, reaching the maximum at the edge of the plate. The angle is basically symmetrical along the center line of the plate; The surface is obviously deformed by a curved surface and the area from the scanning line to the outer circular line of the sector plate is inwardly recessed, and the area from the scanning line to the inner circular line of the sector plate is convex outward. The research results provide a basis for in-depth understanding of the three-dimensional deformation mechanism of laser circular scanning.
引文
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[2]Hennige T.Development of irradiation strategies for 3D-laser forming[J].Journal of Materials Process Technology,2000,103(1):102-108.
[3]Zhang Peng,Gao Hongliang,Chu Guannan.Study on laser sine forming of sheet metals[J].Manufacturing Technology&Machine Tool,2007(3):35-38.(in Chinese)
[4]Deng Chunfeng,Zhang Peng,Ma Yanxia.Deformation behavior of sheet metal during laser sine cosine scanning[J].China Metal Forming Equipment&Manufacturing Technology,2008,43(5):93-95.(in Chinese)
[5]Kant R,Bhuyan P M,Joshi S N.Experimental studies on TGM and BM dominated curvilinear laser bending of aluminum alloy sheets[C]//Lasers Based Manufacturing,2015:69-91.
[6]Kant R,Joshi S N.Numerical modeling and experimental validation of curvilinear laser bending of magnesium alloy sheets[J].Proceedings of the Institution of Mechanical Engineers PART B-Journal of Engineering Manufacture,2014,228(9SI):1036-1047.
[7]Kant R,Bhuyan P M,Joshi S N.Experimental studies on curvi-linear laser bending of thin sheets[C]//ICATSA 2016,2016:539-548.
[8]Kant R,Joshi S N.Numerical investigations into influence of scanning path curvature on deformation behavior during curvilinear laser bending of magnesium sheets[J].Journal of Thermal Stresses,2018,41(3):313-330.
[9]Nadeem Q,Seong W J,Na S J.Process designing for laser forming of circular sheet metal[J].Chinese Optics Letters,2012,10(2):021405.
[10]Nadeem Q,Na S J.An approach to form the dome shape by 3Dlaser forming[J].Chinese Optics Letters,2013,11(2):021402.
[11]Esfahani R T,Golabi S,Zojaji Z.Optimization of finite element model of laser forming in circular path using genetic algorithms and ANFIS[J].Soft Computing,2016,20(5SI):2031-2045.
[12]Wang Maolu,Yang Lijun.Investigation on the scanning strategy of 3D laser forming of sheet metal[J].Journal of Plasticity Engineering,2013(6):51-55.(in Chinese)
[13]Ma Xupeng,Wang Xuyue,Xu Wenji,et al.Heat conduction characteristics of stainless steel-carbon steel laminated sheet bending position[J].Laser&Optoelectronics Progress,2013,50(10):101401.(in Chinese)