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Statistical modelling and optimization of surface roughness in the selective laser sintering process

zhiqiang.tong 添加于 2010-2-4 16:51 | 1967 次阅读 | 0 个评论

作者
Bacchewar PB, Singhal SK, Pandey PM
摘要
Selective laser sintering (SLS) is a layered manufacturing process that builds prototypes by selective sintering of materials in powder form, like thermoplastic polymer powder (Poll amide 2200), using a CO2 laser. Prototypes made by SLS are widely used in product development as they can be used for product testing. SLS prototypes, therefore, should have a very good surface finish for functional performance as well as aesthetics. However, prototypes made by the SLS process have comparatively high surface roughness due to the stair stepping effect. Surface roughness of the prototypes also depends on the various process parameters. This paper attempts to study the effect of process parameters, namely build orientation, laser power, layer thickness, beam speed, and hatch spacing, on surface roughness. Central rotatable composite design (CCD) of experiments was used to plan the experiments. Analysis of variance (ANOVA) was used to study the significance of process variables on surface roughness. In the case of upward-facing surfaces, build orientation and layer thickness have been found to be significant parameters. In downward-facing surfaces, other than build orientation and layer thickness, laser power has also been found to be significant. Empirical models have been developed for estimating the surface roughness of the parts. A trust-region-based optimization method (standard module of MATLAB) has been employed to obtain a set of process parameters for obtaining the best surface finish. A confirmation experiment has been carried out at an optimum set of parameters and predicted results were found to be in good agreement with experimental findings. A case study of a standard part 'Truncheon' is also presented.
详细资料
- 关键词: selective laser sintering (SLS); surface roughness; CCD; ANOVA
- 文献种类: Journal article
- 期刊名称: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
- 期卷页: 2007年第221卷第1期 35-52页
- 出版社: PROFESSIONAL ENGINEERING PUBLISHING LTD, 1 BIRDCAGE WALK, WESTMINISTER SW1H 9JJ, ENGLAND
- 地址: 1. Indian Inst Technol, Dept Mech Engn, New Delhi 110016, India
- ISBN: 0954-4054
学科领域工程技术 » 机械工程
标签

roughness
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