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Relationship between process parameters and mechanical properties of PA12 parts by laser sintering

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Document pages: 11 pages

Abstract: Selective laser sintering (SLS) is an additional manufacturing technology, which can produce customized complex products. SLS has proved itself to be a feasible prototype tool and production method of non critical products. The industry has realized the potential of SLS, which raises the question of whether it is possible to produce functional products with renewable mechanical properties for key industries. The characteristics of SLS parts largely depend on the process settings applied. Therefore, this study investigated the effects of key process parameters (preheating temperature, laser power, scanning spacing, scanning speed, layer thickness and part construction direction) on the properties (tensile strength, tensile modulus, elongation at break and part density) of SLS production parts A design of experiments (DoE) approach was used to plan the experiments. Test samples according to DIN EN ISO 527-2 were produced on a sintering system (EOSINT P395) using polyamide 12 powder (EOS PA2200). Regression models that describe the relation between the process settings and resulting part properties were developed. Sensitivity analysis showed that mechanical properties of sintered parts were highly affected by layer thickness and scan spacing variations.

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