激光选区熔化零件成型纵向裂缝分析及解决办法
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摘要
从宏观和微观两方面分析激光选区熔化设备零件打印中出现纵向裂缝的原因,认为纵向裂缝的产生主要表现在激光扫描能量过低。通过测试扫描光路系统各项性能将问题定位于光路系统延时,然后,调试光路系统延时的参数保证打印零件上不存在裂缝。最后根据工艺试验的结果(成型零件的随炉样件致密度高达99.7%,抗拉强度为626 MPa)验证零件纵向裂缝的影响因素之一为光路系统在该位置激光能量过低。
We analyze the causes of longitudinal cracks from macroscopic and microscopic aspects in selective laser melting. The result shows that the mainly reason is the low energy of laser scanning. Then, testing the performance of the scanning optical system, the problem is focused to the optical system delays. To ensure that the cracks disappeared on the printed parts, adjusted the parameters of the optical system delay. Finally, according to the results of the samples(the density of the samples is 99.7% and the tensile strength is 626 MPa), to verified the laser too low scanning energy at this position is one of the factors in the longitudinal crack of the selective laser melting.
We analyze the causes of longitudinal cracks from macroscopic and microscopic aspects in selective laser melting. The result shows that the mainly reason is the low energy of laser scanning. Then, testing the performance of the scanning optical system, the problem is focused to the optical system delays. To ensure that the cracks disappeared on the printed parts, adjusted the parameters of the optical system delay. Finally, according to the results of the samples(the density of the samples is 99.7% and the tensile strength is 626 MPa), to verified the laser too low scanning energy at this position is one of the factors in the longitudinal crack of the selective laser melting.
引文
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[2] DONG PENG,LI ZHONGHUA,YAN ZHENYU,et al.Research status of selective laser melting of aluminum alloys[J].Applied Laser,2015(5):607-611.董鹏,李忠华,严振宇,等.铝合金激光选区熔化成形技术研究现状[J].应用激光,2015(5):607-611.
[3] ZHAO YUHUI,WANG ZHIGUO,LONG YU,et al.Research on influential factor of temperature of molten pool of inconel 625 super alloy by laser additive manufacturing[J].Applied Laser,2015,35(2):137-144.赵宇辉,王志国,龙雨,等.Inconel 625镍基高温合金激光增材制造熔池温度影响因素研究[J].应用激光,2015,35(2):137-144.
[4] ZHANG DONGYUN.Effect of properties of powders on manufacturing process (SLM) of metallic models[J].Applied Laser,2007,27(1):9-12.张冬云.粉末材料性能对SLM模型制造过程影响的研究[J].应用激光,2007,27(1):9-12.
[5] 吴伟辉,杨永强.半导体泵浦激光器在选区激光熔化工艺中的应用研究[J].机电工程技术,2006,35(11):91-94.
[6] WANG DI,CHEN XIAOMIN,YANG YONGQIIANG,et al.Study on the key techniques of designing Optimization and manufacturing functional part's structre based on selective laser melting technology[J].Journal of Mechanical Engineering,2018,54(17):165-172.王迪,陈晓敏,杨永强,等.基于激光选区熔化的功能零件结构设计优化及制造关键技术研究[J].机械工程学报,2018,54(17):165-172.
[7] 黄常帅,杨永强,吴伟辉.金属构件选区激光熔化快速成型铺粉控制系统研究[J].机电工程技术,2005,34(6):31-34.
[8] SHAO YUCHENG,CHEN CHANGJUN,ZHANG MIN,et al.Research on crack issue of deloro 40Ni alloys prototype fabricated by laser additive manufacturing[J].Applied Laser,2016(4):397-402.邵玉呈,陈长军,张敏,等.关于Deloro 40镍基合金粉末激光增材制造成型件裂纹问题研究[J].应用激光,2016(4):397-402.
[9] WANG PEI,HUANG ZHENGHUA,QI WENJUN,et al.Effect of the 3D printing process parameters based on SLM technology on the structural defect of 316 stainless steel[J].JIXIE ZHIZAO WENZHAI (HANJIE FENCE),2016(2):2-7.王沛,黄正华,戚文军,等.基于SLM技术的3D打印工艺参数对316不锈钢组织缺陷的影响[J].机械制造文摘-焊接分册,2016(2):2-7.
[10] DENG SHISHI,YANG YONGQIANG,LI YANG,et al.Planning of area-partition scanning path and its effect on residual stress of SLM molding parts[J].Chinese Journal of Lasers,2016(12):61-69.邓诗诗,杨永强,李阳,等.分区扫描路径规划及其对SLM成型件残余应力分布的影响[J].中国激光,2016(12):61-69.
[11] 赵毅.振镜矢量扫描的自适应轮廓控制[J].中国机械工程,2003,14(12):1015-1018.
[12] ZHU CHENGKAI,DING LIPING.Research on forming qualities during selective laser melting based on scanner delay strategy[J].Applied Laser,2017(2):207-212.朱成凯,丁力平.基于振镜延时的选区激光熔化成型质量研究[J].应用激光,2017(2):207-212.