مرکز منطقه ای اطلاع رساني علوم و فناوري - INVESTIGATION OF PROCESS PARAMETERS OF DIRECT METAL LASER SINTERING (DMLS) BENCH FOR RESEARCH AND DEVELOPMENT PURPOSE

Abstract :

In 1970s rapid prototyping systems, aimed at producing the samples of design. Since the beginning of 1980s people have started to talk manufacturing real part instead of sampling and they called the method of manufacturing as additive manufacturing. In 1990s with the development of additive manufacturing systems it has been started to manufacture direct end use functional part from metal and ceramic. Nowadays, with SLS machines by using various metal powders the part which has so complex geometry that cannot be manufactured by using conventional methods are able to be manufactured in many fields. DMLS bench which has first been manufactured in our country and which has been designed within the project supported by ministry of development was used in this study. Many experiments have been carried out aiming at determing bench process parameters by using 316L stainless steel powder. Single line scan, multi line scan and single layer scan were tried by changing the laser power between the range of 50W and 175W and scanning speed between the range of 5mm/s and 1000mm/s. Single line was achieved with a proper merging; the laser power was 100-175W and scanning speed was 85-100mm/s. Fusion was observed when the laser power was 100W, 125W and scanning speed was 100mm/s,200mm/s. More successful layer formation was observed when the laser power was 100W, scanning speed was 400mm/s and scanning distance 25μm.