Influence of the Energy Density on the Porosity of Polyamide Parts in SLS Process

2012 ◽  
Vol 188 ◽  
pp. 400-405 ◽  
Author(s):  
Mirela Toth-Taşcău ◽  
Aurel Raduta ◽  
Dan Ioan Stoia ◽  
Cosmin Locovei
Keyword(s):  
Energy Density ◽  
Laser Beam ◽  
Process Parameters ◽  
Selective Laser Sintering ◽  
Main Process ◽  
Sintering Process ◽  
Part Quality ◽  
Part Structure ◽  
The Relationship ◽  
Recycled Material

This paper presents an experimental study about the influence of the Selective Laser Sintering process parameters on the surface and cross-section porosity of parts sintered in polyamide PA2200 material two times recycled. Using of recycled powder affects the part structure and mechanical properties. Therefore, the paper aims to develop a suitable strategy to improve the part structure by controlling the most important SLS process parameters. The main process parameter whose influence was studied is the energy density of the laser beam. Special sample was designed and prototyped using EOS P100 prototyping machine. Three repetition jobs with different energy density of the laser beam were performed. Scanning Electron Microscopy was used to analyze the surface morphology and microstructure of the sintered benchmark parts. The relationship between the SLS parameters and part quality will extend the use of PA2200 recycled material.

Experimental Study on Warping Height of PA12/HDPE Specimen by Selective Laser Sintering

2010 ◽  
Vol 43 ◽  
pp. 430-433
Author(s):  
Nai Fei Ren ◽  
Pan Wang ◽  
Yan Luo ◽  
Hui Juan Wu
Keyword(s):  
Process Parameters ◽  
Selective Laser Sintering ◽  
Single Layer ◽  
Dimensional Accuracy ◽  
Laser Sintering ◽  
Sintering Process ◽  
Influence Of Process Parameters ◽  
Optimum Parameters ◽  
Scan Speed ◽  
The Relationship

The dimensional accuracy and mechanics properties of parts made by Selective Laser Sintering depend greatly on the sintering process parameters. The influence of process parameters on warping weight of parts sintered by blends of polyamide (PA12) and high density polyethylene (HDPE) was studied. The relationship between the process parameters and the warping height was presented. The surface morphology of the part and uniformity of powder mixed were analyzed by SEM. The optimum parameters of minimum warping height were obtained: preheat temperature 110°C, scan speed 300mm/s, laser power 21W, thickness of single layer 0.2mm.

Research on Warpage of Polystyrene in Selective Laser Sintering

2010 ◽  
Vol 43 ◽  
pp. 578-582 ◽  
Author(s):  
C.Y. Wang ◽  
Q. Dong ◽  
X.X. Shen
Keyword(s):  
Layer Thickness ◽  
Process Parameters ◽  
Laser Power ◽  
Selective Laser Sintering ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Main Process ◽  
Influence Of Process Parameters ◽  
Temperature Changes ◽  
Hatch Spacing

Warpage is a crucial factor to accuracy of sintering part in selective laser sintering (SLS) process. In this paper, The influence of process parameters on warpage when sintering polystyrene(PS) materials in SLS are investigated. The laser power, scanning speed, hatch spacing, layer thickness as well as temperature of powder are considered as the main process parameters. The results showed that warpage increases with the increase of hatch space. Contary to it, warpage decreases with the increase of laser power. Warpage decreases with the increase of layer thickness between 0.16~0.18mm and changes little with increase of the thickness. Warpage increases along with the increase of scanning speed but decreases when the speed is over about 2000mm/s. When the temperature changes between 82°C-86°C, warpage decreases little with the increase of temperature. But further increase of temperature leads to warpage decreasing sharply when the temperature changes between 86°C-90°C.

scholarly journals Correlations between Process Parameters and Outcome Properties of Laser-Sintered Polyamide

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1850 ◽  
Author(s):  
Dan Ioan Stoia ◽  
Liviu Marşavina ◽  
Emanoil Linul
Keyword(s):  
Mechanical Properties ◽  
Energy Density ◽  
Process Parameters ◽  
Linear Trend ◽  
Selective Laser Sintering ◽  
Orientation Angle ◽  
Strength Properties ◽  
Process Variables ◽  
Sample Density ◽  
Dimensional Errors

As additive manufacturing (AM) becomes more accessible, correlating process parameters with geometric and mechanical properties is an important topic. Because the number of process variables in AM is large, extensive studies must be conducted in order to underline every particular influence. The study focuses on two variables—part orientation in the orthogonal horizontal plane and energy density—and targets two outcomes—geometric and tensile properties of the parts. The AM process was conducted on selective laser sintering (SLS) machine EOS Formiga P100 using EOS white powder polyamide (PA2200). After finishing the sinterization process, the parts were postprocessed, measured, weighted, and mechanically tested. The geometric evaluation and mass measurements of every sample allowed us to compute the density of all parts according to the sinterization energy and orientation, and to determine the relative error of every dimension. By conducting the tensile testing, the elastic and strength properties were determined according to process variables. A linear trend regarding sample density and energy density was identified. Also, large relative dimensional errors were recorded for the lowest energy density. Mechanical properties encountered the highest value for the highest energy density at a 45° orientation angle.

A Study on Topology of Lateral Surface of Components Manufactured by Selective Laser Sintering

2012 ◽  
Vol 584 ◽  
pp. 357-360
Author(s):  
C.D. Naiju ◽  
M. Adithan ◽  
P. Radhakrishnan ◽  
K. Annamalai
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Lateral Surface ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Surface Topology ◽  
Main Process ◽  
Slice Thickness ◽  
Developed Surface ◽  
Main Process Parameter

This work presents the results of a study carried out to determine the topology of lateral surface and its effect on the process parameters of components manufactured by selective laser sintering (SLS). Using Taguchi’s experimental technique, an orthogonal array of L4 had been developed. Surface roughness was measured along built direction and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify main process parameter that influences surface roughness on SLS components. It has been found that slice thickness and scan spacing have more significant influence than the laser power. Microstructure of the sintered specimen along the build direction was studied using Scanning Electron Microscope (SEM). It was observed that variations in slice thickness affect surface topology of SLS components.

Optimization of Selective Laser Sintering Process Parameters on Surface Quality

2018 ◽  
pp. 141-157 ◽  
Author(s):  
M. Akilesh ◽  
P. R. Elango ◽  
A. Achith Devanand ◽  
R. Soundararajan ◽  
P. Ashoka Varthanan
Keyword(s):  
Surface Quality ◽  
Process Parameters ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Sintering Process

Optimization and analysis of porosity and roughness in selective laser melting 316L parts

2018 ◽  
Vol 1 (90) ◽  
pp. 5-15 ◽  
Author(s):  
M. Król ◽  
J. Mazurkiewicz ◽  
S. Żołnierczyk
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Laser Beam ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
316L Stainless Steel ◽  
Selective Laser Sintering ◽  
Technological Parameters ◽  
Laser Melting ◽  
Research Issues

Purpose: The investigations have been carried out on 316L stainless steel parts fabricated by Selective Laser Melting (SLM) technique. The study aimed to determine the effect of SLM parameters on porosity, hardness, and structure of 316L stainless steel. Design/methodology/approach: The analyses were conducted on 316L stainless steel parts by using AM125 SLM machine by Renishaw. The effects of the different manufacturing process parameters as power output, laser distance between the point’s melted metal powder during additive manufacturing as well as the orientation of the model relative to the laser beam and substrate on porosity, hardness, microstructure and roughness were analysed and optimised. Findings: The surface quality parts using 316L steel with the assumed parameters of the experiment depends on the process parameters used during the SLM technique as well as the orientation of formed walls of the model relative to the substrate and thus the laser beam. The lowest roughness of 316L SLM parts oriented perpendicularly to the substrate was found when 100 W and 20 μm the distance point was utilised. The lowest roughness for part oriented at 60° relatives to the substrate was observed when 125 W and the point distance 50 μm was employed. Practical implications: Stainless steel is one of the most popular materials used for selective laser sintering (SLM) processing to produce nearly fully dense components from 3D CAD models. Reduction of porosity is one of the critical research issues within the additive manufacturing technique SLM, since one of the major cost factors is the post-processing. Originality/value: This manuscript can serve as an aid in understanding the importance of technological parameters on quality and porosity of manufactured AM parts made by SLM technique.

Preparation and Selective Laser Sintering Mechanism of Polymer-Coated Mo Powder

2010 ◽  
Vol 148-149 ◽  
pp. 511-514 ◽  
Author(s):  
Bin Liu ◽  
Pei Kang Bai ◽  
Yu Xin Li
Keyword(s):  
Viscous Flow ◽  
Process Parameters ◽  
Early Stage ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Molybdenum Powder ◽  
Sintering Process ◽  
Major Mechanism ◽  
Sintering Mechanism

A multi-component polymer-coated molybdenum powder was chosen for selective laser sintering (SLS). A novel preparing method of polymer-coated molybdenum powder was presented. The effect of the process parameters on the part’s characteristics is investigated. Based on our study for dynamic laser sintering process of polymer-coated molybdenum powder, its laser sintering mechanism was reported as follows: at the early stage of laser sintering, the viscous flow is the major mechanism; during the laser sintering, the melting/solidification is the major mechanism. Furthermore, a model corresponding to the mechanism was discussed schematically, which could be used to explain the material migrating mode during laser sintering process.

Study on the Effect of Process Parameters on Reciprocating Wear Behavior of Components Produced by Selective Laser Sintering (SLS)

2012 ◽  
Vol 488-489 ◽  
pp. 1424-1428 ◽  
Author(s):  
C.D. Naiju ◽  
P.K. Manoj ◽  
Tarun Thomas George ◽  
Joseph Kurian
Keyword(s):  
Process Parameters ◽  
Wear Behavior ◽  
Standard Procedure ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Wear Testing ◽  
Main Process ◽  
Reciprocating Wear ◽  
Main Process Parameter ◽  
Anova Technique

This work presents the results of a study carried out to determine the reciprocating wear behavior and its effect on the process parameters of components manufactured by selective laser sintering (SLS). A standard procedure and specimen had been used in the present study to find the wear behavior. Using Taguchi’s experimental technique, an orthogonal array of modified L9 had been developed. Reciprocating wear testing was carried out and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify the main process parameter that influences the properties of wear behavior on the SLS components. It has been found that laser power had more influence on wear as compared to other selected process parameters. Micro-structural analysis was also carried out using scanning electron microscope on the wear testing sample.

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