摘要
碳纤维增强复合材料(CFRP,Carbon fiber reinforced plastics)广泛应用于航空航天、新能源汽车领域,常用机械方式加工CFRP,但成本高、效率低。激光加工高效、绿色、精度高,但激光加工CFRP存在较大的热影响区。为探索激光能量在CFRP内部的传递规律,并抑制热影响区的产生,开展CO_(2)连续激光对CFRP进行点射试验和矩形切割试验。通过点射试验确定了激光器最大功率密度为198.84 W/mm^(2)。研究发现进行单次矩形切割试验时,能量主要在材料表层碳纤维传递,并影响树脂发生热膨胀和熔融;当扫描速度为3 mm/s、激光功率密度为198.84 W/mm^(2)时,矩形表面凹凸波动值(F_(v))达到最大,约为25.83μm,表层能量累积最明显。同时,试验发现提高扫描速度或降低激光功率可以有效降低F_(v),并抑制热影响区扩大。开展多次矩形切割试验时,不同加工次数均存在层面和层间的能量传递,当加工次数为15次时,F_(v)达到最大,约为41.75μm,当加工次数为20次时,能量层间传递优于层面传递。
Carbon fiber reinforced plastics(CFRP)is widely used in the field of aerospace and new energy vehicles.Traditional machining methods are usually used to process CFRP,but the cost is high and the efficiency is low.Laser processing method has the advantages of high efficiency,green and high precision,but there is a large heat affected zone in laser processing CFRP.In order to explore the transfer rule of laser energy in CFRP and restrain the generation of heat affected zone,the experiments for CRFP of CO_(2)continuous laser spot and rectangular cutting were carried out.The spot experiment showed that the maximum power density of the laser was determined to be 198.84 W/mm^(2).The single rectangular cutting experiment showed that the energy was mainly transferred to the carbon fiber on the surface of the material and affected the thermal expansion and melting of the resin.When the scanning speed was 3 mm/s and the laser power density was 198.84 W/mm^(2),the concave convex fluctuation value(F_(v))of the rectangular surface reached the maximum of approximately 25.83μm,and the surface energy accumulation was most obvious.In addition,it was found that the increasing scanning speed or the decreasing laser power could effectively reduce the concave convex fluctuation value and suppress the expansion of the heat affected zone.The multiple rectangular cutting experiment showed that under the condition of different processing times,the phenomena of the laser energy transfer layer at surface level and between layers were existed.When the number of processing times was 15,the concave convex fluctuation value reached the maximum of approximately 41.75μm.When the number of processing times was 20,the energy transfer between layers was better than that at surface level.
作者
蔡颂
徐闻声
李琦
余凡
谢远昊
张融
吉毅
Cai Song;Xu Wensheng;Li Qi;Yu Fan;Xie Yuanhao;Zhang Rong;Ji Yi(School of Intelligent Manufacturing,Wuchang Institute of Technology,Wuhan 430065,Hubei,China;School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430048,Hubei,China;School of Mechanical Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China;School of Mechanical Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《应用激光》
CSCD
北大核心
2024年第6期86-95,共10页
Applied Laser
基金
国家自然科学基金(51705141,51975192)
中国博士后特别资助基金(2019T120650)
湖南省教育厅优秀青年项目(21B0523)
湖北省高等学校优秀中青年科技创新团队科研基金(2020042)
湖北省高等教育学会专项课题(2021ZD54)、(022101001012)。
关键词
连续激光
碳纤维增强复合材料
能量累积
切割试验
continuous-wavelaser
carbon fiber reinforced plastics
energy accumulation
cutting test
