镍锌铁氧体复合片材亚纳秒激光切割  

Sub-Nanosecond Laser Cutting Nickel-Zinc Ferrite Composite Sheet

作　　者：范新虎 黄禹[1] 荣佑民 Fan Xinhu;Huang Yu;Rong Youmin(School of Mechanical Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Guangdong HUST Industrial Technology Research Institute,Dongguan 523808,Guangdong,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 [2]广东华中科技大学工业技术研究院,广东东莞523808

出　　处：《应用激光》2023年第3期48-58,共11页Applied Laser

基　　金：广东省自然科学基金面上项目(2020A1515011393)。

摘　　要：镍锌铁氧体复合材料是一种性能优良的吸波材料,同时还具有高柔性和可加工性,广泛用于屏蔽通信中的电磁干扰。为提高铁氧体复合片材的切割质量,采用先进的脉冲激光切割工艺,并选择窄脉宽的亚纳秒脉冲激光为光源。首先改进了激光切割的扫描策略,结果表明,与常规的多遍策略相比,周期性“扫描-冷却”多遍策略显著抑制了热积累,使切缝热影响区宽度从567.39μm减小至249.42μm,降低了56%。在改进的扫描策略基础上,使用响应曲面模型分析激光平均功率(P)、光束扫描速度(v)、“扫描-冷却”每个周期内扫描次数(n_(1))3个因素对热影响区宽度和切割效率的综合影响,并进行参数优化。高的平均功率、高的扫描速度和少的扫描次数有利于降低热影响区宽度,同时兼顾切割效率。参数优化结果显示,平均功率19.7~21.1 W,扫描速度1750~1800 mm/s,每个周期内扫描20~24次,可以实现在9个周期切断0.2 mm镍锌铁氧体复合片材,切缝热影响区宽度约为200μm。Nickel-zinc ferrite composite material as an excellent absorbing material with high flexibility and machinability,is widely used in shielding electromagnetic interference in communication.To improve the cutting quality of ferrite composite sheets,laser cutting process with sub-nanosecond pulsed laser was selected in this work.The scanning strategy of laser cutting was improved firstly.Compared with the conventional multi-pass strategy,the improved multi-pass strategy with periodic scanning-cooling suppressed the heat accumulation significantly.The width of the HAZ(heat affected zone)of kerf reduces from 567.39μm to 249.42μm,a decrease of 56%.Response surface model was used to analyze the comprehensive effects of average laser power(P),beam scanning speed(v),and the number of scans in each cycle of scanning-cooling(n_(1))on the width of HAZ and cutting efficiency.The parameters were analyzed for proper process window.High average power,high scan speed,and few scan times are beneficial to reduce the width of HAZ while taking into account the cutting efficiency.Results of parameter optimization showed that the improved processing could cut off 0.2 mm nickel-zinc ferrite composite sheet in 9 cycles with the average power is 19.7-21.1 W,the scanning speed is 1750-1800 mm/s,the number of scans in each cycle is 20-24,and the width of the HAZ is about 200μm.

关 键 词：电磁屏蔽材料 激光加工 扫描策略 热影响区 

分 类 号：TM277[一般工业技术—材料科学与工程] TB34[电气工程—电工理论与新技术]