Considerations on the surface roughness of SLM processed metal parts and the effects of subsequent sandblasting

International Conference on Innovative Research - ICIR EUROINVENT 2019

Bernevig-Sava, M.A.^1 ; Stamate, C.^1 ; Lohan, N.-M.^1 ; Baciu, A.M.^2 ; Postolache, I.^1 ; Baciu, C.^1 ; Baciu, E.-R.^3

Gheorghe Asachi Technical University of Iasi, Prof. dr. Dimitrie Mangeron Blvd. 63, Iasi

700050, Romania^1

S.C. Colorcontrol S.R.L, 25A, Ortiei Street, Cluj-Napoca, Cluj, Romania^2

Gr. T. Popa University of Medicine and Pharmacy of Iasi, Faculty of Dental Medicine, 16 University Street, Iasi

700115, Romania^3

关键词: Additive manufacturing technology;    Exposure-time;    Layer by layer;    Number and size;    Scanning speed;    Specific values;    Technological parameters;    Uniformization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/572/1/012071/pdf
DOI  :  10.1088/1757-899X/572/1/012071

来源: IOP

【 摘 要 】

Selective Laser Melting is an Additive Manufacturing technology based on 3D scanning of successive layers of metal powder. Three distinct values were determined for each of the three technological parameters (P-the power of the laser, Vscan-scanning speed and te-exposure time), therefore resulting nine sets for the "layer by layer" processing. After SLM processing, the samples were sandblasted simply (1S), sandblasted successively (2S), or left unsandblasted (NS). The roughness (Ra) of the outer surfaces was measured for all the samples, and there was found a decrease in the height of the micro-irregularities and the uniformization of the roughness profile along with the intensification of the sandblasting process. For some samples, there were found uncertainties regarding the accuracy of the experimental results' values, determined by the presence of the adherent particles identified by the SEM analysis of the outer surfaces. The number and size of these particles have affected the manner in which the samples were placed on the roughness tester's plate, as well as the accuracy of the measurements. Under these conditions, the tip of the roughness tester's diamond stylus has recorded the specific values of the surface's secondary profile, which is affected by the existence of the formations adhering to the primary profile of the SLM processed samples.