Manufacturing by combining selective laser melting andselective laser erosion / laser re-melting
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- Tez No: 711846
- Danışmanlar: PROF. DR. JEAN-PİERRE KRUTH
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2011
- Dil: İngilizce
- Üniversite: Katholieke Universiteit Leuven (Catholic University of Leuven)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 290
Özet
Özet yok.
Özet (Çeviri)
Selective Laser Melting (SLM) is a layer-wise material addition process that allows generating complex and functional three-dimensional parts by selectively melting successive layers of metal powder on top of each other, using the thermal energy of a focused and computer controlled laser beam. It provides various advantages compared to convectional subtractive production techniques. First of all, there is no need for a tool eliminating the burdensome pre-processing steps like tool path generation and other issues like tool wear compensation. The SLM process is also very suitable for mass customization and individualization of products. This makes the dental and medical parts suitable to be manufactured by SLM due to their complex geometry that has to fit to the amorphous anatomical shape and their strong individualization since every patient is different. On the other hand, it has some limitations preventing the process to be widely used in different industrial fields regarding various aspects. Most of these limitations are either inherent to layer manufacturing, e.g. stair-effect or related to high thermal gradients due to full melting and rapid solidification, e.g. residual stresses, insufficient micro machining capability. Furthermore, 1-2% porosity may be present in the SLM parts despite the full melting leading to detrimental influences on mechanical properties. Additive Manufacturing Group at K.U.Leuven mainly aims at improving the SLM process to a level enabling production of functional parts and tools with good part and material properties, even when very complex geometries are involved, in a competitive way. This thesis mainly targets to improve the SLM process regarding various aspects such as surface roughness, density, mechanical properties and precision and micro machining capability by employing secondary processes such as Selective Laser Erosion (SLE) and laser re-melting. In order to accomplish manufacturing by combining SLM with SLE or laser re-melting, the secondary processes were first studied in detail to understand the different mechanisms in those processes other than SLM. SLE and laser re-melting experiments were conducted on a Concept Laser M3 Linear machine with stainless steel.
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