Simulation analysis of features of overhanging structure fabricated by selective laser melting

LIN Huijie; SHEN Lida; JIANG Jinhui; XIE Deqiao; LIANG Huixin; FAN Qinchun

doi:10.7527/S1000-6893.2018.21897

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2018 , Vol. 39 >Issue 7: 421897 - 421897

DOI: https://doi.org/10.7527/S1000-6893.2018.21897

Material Engineering and Mechanical Manufacturing

Simulation analysis of features of overhanging structure fabricated by selective laser melting

LIN Huijie ,
SHEN Lida ,
JIANG Jinhui ,
XIE Deqiao ,
LIANG Huixin ,
FAN Qinchun

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1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Nanjing Zhongke Raycham Laser Technology Co., Ltd., Nanjing 210046, China

Received date: 2017-11-27

Revised date: 2018-03-07

Online published: 2018-03-07

Supported by

National Natural Science Foundation of China (U1537105); National Key Research and Development Plan (2016YFB1100500); Key Support Projects for Jiangsu Science and Technology Support Program (BE2014009-1); Competition Support Project for Jiangsu Science and Technology Support Program (BE2015161); Key Support Projects for Jiangsu Science and Technology Support Program (BE2016010-3)

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Abstract

The temperature field and stress field of the overhanging structure fabricated by selective laser melting are simulated. Finite element analysis software is used to establish a three-dimensional transient model for the structure. The influence of laser power and scanning speed on the forming quality of the structure is analyzed numerically and validated experimentally. The results show that in the forming process of the structure, the temperature of the molten pool located at the overhanging position is obviously higher than that located at the central position when laser scanning these position. The maximum residual stress occurs at the coincident crossover points of the layer scan region and the substrate. Obvious deformation occurs at the position of the overhanging structure. When the ratio of laser power to sweep velocity is constant, the greater the laser power is, the larger deformation the overhanging structure has.

Key words： selective laser melting; temperature field; simulation analysis; overhanging structure; warping deformation

Cite this article

LIN Huijie , SHEN Lida , JIANG Jinhui , XIE Deqiao , LIANG Huixin , FAN Qinchun . Simulation analysis of features of overhanging structure fabricated by selective laser melting[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018 , 39(7) : 421897 -421897 . DOI: 10.7527/S1000-6893.2018.21897

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