Research of upper surface roughness of metal parts fabricated by selective laser melting

LIU Rui-cheng; YANG Yong-qiang; WANG Di

doi:10.7510/jgjs.issn.1001-3806.2013.04.003

In order to provide the theory basis to improve the surface quality, the main factors affecting the upper surface roughness of metal parts fabricated by selective laser melting(SLM)were studied. By studying the single track melting, the upper surface roughness of SLM parts was analyzed from the view of melting track lapping. The metal parts were fabricated by using the self-developed fabrication equipment Dimetal-280 and the measure roughness parameters were compared with the theoretical value. The theoretical value of arithmetical mean deviation of the profile Ra was 3.21m and the theoretical value of ten-point height of irregulartlies Rz was 12.79m. The actual value was Ra=7.36m and Rz=40.01m. After electrochemical polishing, the surface roughness was reduced to Ra=2.34m and Rz=10.86m. The results prove that upper surface roughness of the metal part was influenced by melting track width, scanning space and layer thickness altogether. The reason of the discrepancy between theoretical value and actual value was some defects such as instability in melting track, spheroidization on the surface and dust adhesiveness. The quality of surface roughness was greatly improved after electrochemical polishing. The metal parts processed by selective laser melting could obtain satisfied surface roughness in this experiment. The results provide guidance to surface research and industrial application in the future.

Research of upper surface roughness of metal parts fabricated by selective laser melting

Corresponding author: YANG Yong-qiang, meyqyang@scut.edu.cn;

1. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China

Received Date: 2012-11-13

Accepted Date: 2012-11-20

Available Online: 2013-07-25

Abstract: In order to provide the theory basis to improve the surface quality, the main factors affecting the upper surface roughness of metal parts fabricated by selective laser melting(SLM)were studied. By studying the single track melting, the upper surface roughness of SLM parts was analyzed from the view of melting track lapping. The metal parts were fabricated by using the self-developed fabrication equipment Dimetal-280 and the measure roughness parameters were compared with the theoretical value. The theoretical value of arithmetical mean deviation of the profile Ra was 3.21m and the theoretical value of ten-point height of irregulartlies Rz was 12.79m. The actual value was Ra=7.36m and Rz=40.01m. After electrochemical polishing, the surface roughness was reduced to Ra=2.34m and Rz=10.86m. The results prove that upper surface roughness of the metal part was influenced by melting track width, scanning space and layer thickness altogether. The reason of the discrepancy between theoretical value and actual value was some defects such as instability in melting track, spheroidization on the surface and dust adhesiveness. The quality of surface roughness was greatly improved after electrochemical polishing. The metal parts processed by selective laser melting could obtain satisfied surface roughness in this experiment. The results provide guidance to surface research and industrial application in the future.

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Reference (14)

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Research of upper surface roughness of metal parts fabricated by selective laser melting

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