期刊
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
卷 50, 期 1, 页码 1-8出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijmachtools.2009.10.003
关键词
Laser solid forming; Thermal analysis; Deposition thickness; Process improvement
资金
- National Natural Science Foundations of China [50871089]
- National 973 Program of China [2007CB613805]
- Program of Introducing Talents of Discipline to Universities [08040]
Laser solid forming (LSF) is a promising manufacturing technology. Thermal behavior is very significant for the research of microstructure, performance and geometric dimension of the fabricated part. In this research, a two-dimensional transient analytical model was developed on a moving square heat source with a uniform heat intensity distribution, and applied to estimate the temperature distribution and deposition thickness of the LSF thin-wall structures. The effects of two ends of the thin-wall structure and the temperature decline after closing the laser beam were investigated. The deposition thickness with different process parameters was also calculated and agreed well with the data measured by a CCD camera system under the practical process parameters despite some differences. Finally, a unique strategy (adjusting the dwell time of laser beam at both ends) was proposed to improve the dimensional accuracy at two ends of the thin-wall sample, and the experimental results demonstrated the validity of the strategy proposed. (C) 2009 Elsevier Ltd. All rights reserved.
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