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首页> 外文会议>International Conference on Surface Modification Technologies >Pulsed Laser Cleaning of Rapid Manufactured Parts
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Pulsed Laser Cleaning of Rapid Manufactured Parts

机译：脉冲激光清洁快速制造的零件

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Direct additive manufacturing of metallic parts is a growth area in modern manufacturing and offers economic, environmental and functional benefits over traditional methods. However, one of the main weaknesses of the methods is the poor surface finish they produce, especially at higher production rates. Secondary mechanical or abrasive oxide removal and smoothing stages can be expensive, imprecise and wasteful and an improved surface finishing and cleaning method is needed. This paper examines a possible non-contact method of smoothing and cleaning the surfaces of laser direct metal deposition (LDMD) built parts using an IPEX-848 KrF Excimer Laser. Samples were treated with up to 1000 pulses of 2 and 4 J/cm{sup}2 fluence at pulse frequencies of 10 and 50 Hz. and the irradiated surfaces characterised using optical microscopy, SEM/EDS analysis, and non-contact profiling. A heat transfer model was used to identify the relative significance of melting, conduction and recoil pressure effects and was matched to thermal images of the surface during processing. Results showed that considerable improvements in surface quality were possible and oxide levels could be reduced from 39% (very heavy oxidation) to less than 3% atomic in seconds. Modelling indicated that most of the absorbed energy was used in the material removal process only approximately 28% of the excimer laser energy was translated to thermal energy and used to raise the temperature of the substrate. The final surface texture indicated that plastic deformation due to recoil pressure during irradiation was also significant. Potentially, the model has wider application in pulsed laser surface processing.
机译：金属部件的直接添加剂制造是现代制造业的生长面积，并提供对传统方法的经济，环境和功能效益。然而，该方法的主要弱点之一是它们产生的差，特别是在更高的生产率下。辅机械或磨料氧化物去除和平滑阶段可以是昂贵的，不精确的，浪费的且需要改进的表面精加工和清洁方法。本文介绍了使用IPEX-848 KRF准分子激光器平滑和清洁激光直接金属沉积（LDMD）内置零件的可能的非接触方法。在脉冲频率为10和50Hz的脉冲频率下，含有高达1000个脉冲的样品，含有高达1000个2和4J / cm {sup} 2。和使用光学显微镜，SEM / EDS分析和非接触式分析的辐照表面。传热模型用于识别熔化，传导和反冲压力效应的相对意义，并且与加工过程中表面的热图像匹配。结果表明，表面质量的相当大的改善，氧化物水平可在几秒钟内从39％（非常重的氧化）降低至小于3％的原子。建模表明，在材料去除过程中使用大部分吸收能量仅将约28％的准分子激光能量转换为热能并用于提高基板的温度。最终表面纹理表明辐照期间引起的塑性变形也显着。潜在地，该模型在脉冲激光表面处理中具有更广泛的应用。

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