CFRP硅油辅助皮秒激光低损伤制孔工艺  

Technology on dimethicone assisted picosecond laser cutting CFRP with low damage

作　　者：陈兴华 荣佑民 李文元 吴从义 陈龙 黄禹[1] 张国军[1] CHEN Xing-hua;RONG You-min;LI Wen-yuan;WU Cong-yi;CHEN Long;HUANG Yu;ZHANG Guo-jun(School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430000,China)

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《激光与红外》2023年第12期1822-1827,共6页Laser & Infrared

基　　金：广东省基础与应用基础研究基金项目(No.2020A1515011393)资助。

摘　　要：皮秒激光加工具有峰值能量高、脉冲作用时间短等特点,是碳纤维复合材料(Carbon fiber reinforced polymer,CFRP)孔切割的重要手段。但是碳纤维和树脂基体的热物性存在较大差异,激光脉冲能量累积与传导行为,致使热损伤难以避免。本文提出一种CFRP硅油辅助皮秒激光制孔工艺,研究硅油对孔内部缺陷、热影响区(Heat affected Zone,HAZ)、孔圆度及锥度的影响。研究表明,与皮秒激光制孔相比,硅油辅助制孔质量显著提高:切口处无基体损伤,孔内壁面无裂纹,仍存在轻微的纤维裸露;孔表面HAZ减至41μm(重复频率200kHz、扫描速度1800mm/s);激光重复频率200kHz、扫描速度600mm/s时锥度减小1609。综上,硅油有助于调控CFRP激光制孔损伤:改善微观缺陷,抑制热影响区,降低锥度等。Picosecond laser processing has the characteristics of high peak energy and short pulse action time,which is an important means of cutting holes in carbon fiber reinforced polymer(CFRP).However,the thermal physical properties of carbon fiber and resin matrix are quite different,and the laser pulse energy accumulation and conduction behavior make thermal damage difficult to avoid.In this paper,a kind of picosecond laser cutting CFRP technology assisted by dimethicone is proposed to study the effect of dimethicone on the internal defects,heat affected zone(HAZ),hole roundness and taper.The results show that the quality of dimethicone assisted hole cutting is significantly improved compared to picosecond laser cutting.And there is no matrix damage at the notch,no crack on the inner wall of the hole,and still slight fiber exposure.HAZ on surface is reduced to 4.1μm(laser repetition of 200 kHz,scanning speed of 1800mm/s).The taper is reduced by 16.09%at a laser repetition frequency of 200 kHz and scanning speed of 600mm/s.In conclusion,dimethicone is helpful to control the damage of CFRP laser cutting which improving the micro defects,suppressing the HAZ,and reducing the taper.

关 键 词：激光切割 CFRP 硅油 HAZ 锥度 

分 类 号：TN205[电子电信—物理电子学] TN249