摘要
为了探究激光加工高体积分数碳化硅颗粒增强铝基(SiCp/Al)复合材料厚板的成孔特征,采用激光旋切法对厚度为4mm的SiCp/Al复合材料进行直径为1mm的制孔实验,分析紫外皮秒激光制孔中重铸层及其表面裂纹的形成机理,获得了关键激光加工参数(激光功率百分比和扫描速率)对孔重铸层的影响规律。结果表明,SiCp/Al复合材料厚板皮秒激光加工中存在百微米级别的重铸层,重铸层厚度不随激光功率的增加而单调变化,在100%的激光功率下厚度最小,其值为99.5μm;而随激光扫描速率的增加而增加,在100mm/s的扫描速率下厚度最小,其值为71.2μm;厚板紫外皮秒激光加工SiCp/Al复合材料的重铸层呈现“月牙型”的弧状形貌特征,同时重铸层表面显著存在横向和纵向等多种裂纹。该研究为实现SiCp/Al复合材料皮秒激光低损伤微小孔加工提供了一定的理论指导。
In order to research the hole-making characteristics of high volume fraction silicon carbide particle reinforced aluminum matrix(SiCp/Al)composite material thick plates processed by laser,the hole making test of 4mm thick plate was carried out using different laser processing parameters.And the formation mechanism of the recast layer and its surface cracks in the hole made by the ultraviolet picosecond laser was analyzed.The influence of key laser processing parameters(laser power percentage and scanning speed)on the hole recast layer was obtained.The results of the experiment show that there is a recast layer of hundred microns in the picosecond laser processing of SiCp/Al composite thick plates.The thickness of the recast layer does not change monotonously with the increase of laser power,and the thickness is the smallest at 100%laser power with value of 99.5μm;the thickness increases with the increase of the laser scanning speed,and the smallest value is 71.2μm at a scanning speed of 100mm/s with.In addition,the recast layer of the thick plate ultraviolet picosecond laser processed SiCp/Al composite has a“crescent”arc-shaped morphology.At the same time,there are significant horizontal and vertical cracks on the surface of the recast layer.This research provides theoretical guidance for low-damage micro-hole machining of SiCp/Al composites with picosecond laser.
作者
刘畅
王晓东
王锴
李丞
LIU Chang;WANG Xiaodong;WANG Kai;LI Cheng(Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, School of Mechanical Engineering, Tiangong University, Tianjin 300387, China;Aerospace Precision Machining Co.Ltd., Tianjin 300300, China)
出处
《激光技术》
CAS
CSCD
北大核心
2022年第3期379-384,共6页
Laser Technology
基金
天津市教委科研计划资助项目(2017KJ081)。
关键词
激光技术
重铸层厚度
紫外皮秒激光
SICP/AL复合材料
laser technique
the thickness of recast layer
ultraviolet picosecond laser
SiCp/Al composites material
