Seçici Lazer Sinterleme (SLS) yönteminde farklı geometrik özelliklerin boyutsal kararlılığı üzerine konum ve yönelim etkisi

Öz

Bu araştırma, havacılık endüstrisindeki güvenlik standartlarına uygunluk için tasarlanmış alev geciktirici PA11 polimer tozu kullanılarak, Seçici Lazer Sinterleme (SLS) teknolojisiyle üretilen parçaların geometri ve boyutlarının kararlılığının incelenmesi üzerine gerçekleştirilmiştir. Baskı odası içindeki çeşitli konum ve yönlerde boyut farklılıklarını belirlemek amacıyla altı farklı örnek parça oluşturulmuştur. Termal genleşme ve büzülme davranışlarının anizotropik olduğu görülmüş; XY eksenlerindeki boyutsal sapmaların platform üzerindeki konuma bağlı olarak -%6.0 ile +%4.4 arasında değiştiği, Z eksenindeki bölgesel hataların ise maksimum -%2.7 seviyesinde kaldığı tespit edilmiştir. İnce cidarlı yapılarda (minimum 0.8 mm limit) yatay yönelim (H_H) en düşük hata oranını sağlarken, 1 mm çapındaki pim ve delik geometrilerinde dikey yönelimin üretilebilirliği tamamen ortadan kaldırdığı görülmüştür. Ayrıca slot boşluklarının, ideal soğumanın gerçekleştiği sağ-ön (RF) bölgede 0.4 mm'ye kadar başarıyla üretilebildiği belirlenmiştir. Özellikle, parça geometrisi, üretim yönü ve hazne içi konumlandırma, boyutsal doğruluğu etkileyen kritik faktörler olarak belirlenmiştir. Sonuçlar, işlevsel ve karmaşık parçalar için Katmanlı İmalat Tasarımı (KİT) kılavuzlarının geliştirilmesine katkıda bulunmakta ve tasarımcıların yüksek hassasiyetli katmanlı imalat sonuçları elde etmelerine yardımcı olacak güvenilir tolerans sınırları sağlamaktadır.

Anahtar Kelimeler

• SLS
• PA11-FR
• Boyutsal kararlılık

The effect of position and orientation on the dimensional stability of different geometric features in Selective Laser Sintering (SLS)

Öz

This research is carried out on the study of the stability of the geometry and dimensions of parts produced using Selective Laser Sintering (SLS) technology, with the use of flame-retardant PA11 polymer powder designed for compliance with security standards in the aerospace industry. Six different sample parts are created in order to determine dimensional discrepancies at various positions and orientations within the printing chamber. Thermal expansion and contraction behaviors were found to be highly anisotropic; dimensional deviations in the XY plane ranged from -6.0% to +4.4% depending on the build platform position, while regional errors along the Z-axis were limited to a maximum of -2.7%. For thin-walled structures (minimum 0.8 mm limit), the horizontal orientation (H_H) provided the lowest error rates, whereas vertical orientations completely eliminated the manufacturability of 1 mm diameter pin and hole geometries. Furthermore, it was determined that slot gaps could be successfully manufactured down to 0.4 mm in the right-front (RF) region, where optimal cooling occurs. The results contribute to the development of Design for Additive Manufacturing (DfAM) guidelines for functional and complex parts and provide reliable tolerance limits to help designers achieve high-precision additive manufacturing outcomes.

Anahtar Kelimeler

• SLS
• PA11-FR
• Dimensional accuracy

Kaynakça

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