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    Investigation into the influence of feeding parameters on the formation of the fed-powder layer in a powder bed fusion (PBF) system  
    Ho-Jin Lee(조선대학교 기계공학과)
    Germany | International Journal of Precision Engineering and
    2017-04-07 | 바로가기
    PBF_system
    Cited by 10

    ■  View full text

    International Journal of Precision Engineering and Manufacturing

    Published: 07 April 2017

    https://doi.org/10.1007/s12541-017-0073-9 

     

     

    ■  Researchers

    Ho-Jin Lee, Jae-Guk Song & Dong-Gyu Ahn

     

    Department of Mechanical Engineering, Chosun University

     

    ■  Abstract

    Characteristics of the deposited layer in a powder bed fusion (PBF) system depend on the formation of the fed-powder layer. The objective of this paper is to investigate the influence of feeding parameters of the powder on the formation of the fed-powder layer in a PBF system. The effects of the gap between the feeding blade and the base plate, the volume of the powder and the supplied shape of the powder on the formation of the fed-powder layer and the defect mode of the powder bed were investigated via manual powder feeding experiments. From the results of the manual experiments, appropriate feeding conditions for achieving the desired formation of the fed-powder layer were estimated. The influence of the speed of the feeding blade and the supplied shape of powders on the formation of the fed-powder layer was examined through automatic powder feeding experiments. From the results of the automatic experiments, a practical speed of the feeding blade and an appropriate supplied shape of powders were determined.

     

     

    ■  Conclusion

    In this paper, the influence of feeding parameters on the formation of the fed-powder layer in a PBF system was investigated via experiments. The effects of the feeding parameters on the maximum width of the fed-powder layer, the width of the fed-powder layer at the centerline of the building platform, and the maximum length of the fed-powder layer on the building platform were examined via manual feeding experiments. The gap between the feeding blade and the base plate, the volume of powders, and the supplied shape of powders were chosen as the feeding parameters in the experiments. From the results of the examination, critical conditions to deposit powders fully on the building platform in both the direction perpendicular to the feeding direction and the feeding direction were estimated. The influence of feeding conditions on the defect mode of the base plate and the fed-powder layer was investigated to estimate proper feeding conditions without any defects in the base plate and the fedpowder layer. Two types of defect modes, including damage of the base plate and insufficient filling of powders on the building plate, were observed. The damage of the base plate was mainly influenced by the gap between the feeding blade and the base plate. The relationship between the gap and the maximum diameter of the used powder was predicted to preserve the base plate from the damage. Perfect filling conditions were estimated to prevent insufficient filling of powders on the building platform. From the results of investigation of the defect mode and the filling ratio, a feeding map was created. Using the feeding map, an appropriate feeding condition has been determined to be a gap of 0.3 mm and the powder volume of 7.5 mL. In addition, normalized volume ratios for perfect filling conditions without any defects were estimated. The effects of the speed of the feeding blade and the supplied shape of powders on the formation of the fed-powder layer under dynamic conditions were examined via automatic powder feeding experiments. From the results of the automatic experiments, a practical feeding speed was determined to be 30 mm/s. In addition, it was shown that the lead distance of the feeding blade in the PBF system and the amount of used powders could be considerably reduced when the supplied shape of powders was changed from a circular shape to an elliptical shape. In future, additional experiments should be carried out to investigate the influence of shape, structure and dimension of the feeding blade on the formation of the fed-powder layer on the building plate.

     

     

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