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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ADVANCED DESIGN AND MANUFACTURING TECHNOLOGY   SEPTEMBER 2014 , Volume 7 , Number 3; Page(s) 19 To 25.
 
Paper: 

EFFECTS OF SCAN DIRECTION AND ORIENTATION ON MECHANICAL PROPERTIES OF LASER SINTERED POLYAMIDE-12

 
 
Author(s):  NELSON J.A., GALLOWAY G., RENNIE A.E.W.*, ABRAM T.N., BENNETT G.R.
 
* DEPARTMENT OF MECHANICAL ENGINEERING, LANCASTER UNIVERSITY, LANCASTER, UK
 
Abstract: 

In order to understand the impact of layer-wise scanning direction in the Selective Laser Sintering process, test coupons were manufactured for mechanical testing from Dura FormTM Polyamide powder. The effects of laser energy density, varying between 0.003 and 0.024 J/mm2 were examined in test specimens rotated 90o through the Z axis. SLS machines do not always facilitate ‘cross-hatching’ of layers and therefore orientation has a major influence on part quality. When employed, the cross-hatching technique scans successive layers perpendicularly to the previous. Studying how parts perform with scan lines in a common direction, will assist in the understanding of how SLS parts behave in practice. Results showed that physical density, tensile strength and elongation rose with energy density up to 0.012 J/mm2. This initial rise was due to a continued improvement in particle fusion with increasing energy density. Above 0.012 J/mm2, these properties started to decline at different rates depending on their orientation (scan direction) on the part bed. Specimen’s oriented perpendicularly to the X axis exhibited a greater elongation at the expense of tensile strength, when compared to parallel specimens.

 
Keyword(s): ENERGY DENSITY, SELECTIVE LASER SINTERING, ORIENTATION, SCAN DIRECTION
 
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