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    Improvement of the wear resistance of hot forging dies using a locally selective deposition technology with transition layers  
    Ho-Jin Lee(조선대학교 기계공학과)
    Nederland | CIRP Annals
    2016-01-07 | 바로가기
    Hot_forging_die
    Cited by 22

    ■  View full text

    CIRP Annals

    Available online 7 January 2016.

    https://doi.org/10.1016/j.cirp.2016.04.013 

     

     

    ■  Researchers

    Dong-Gyu Ahna, Ho-Jin Leea, Jong-Rae Chob, Dae-Seon Guka

     

     Department of Mechanical Engineering, Chosun University, Gwang-ju, Republic of Korea

    b  Department of Mechanical Engineering, Korea Maritime & Ocean University, Busan, Republic of Korea

     

    ■  Abstract

    A locally selective deposition technology with transition layers using a direct energy deposition process is investigated to improve the wear resistance of hot forging dies. A transition layer between the deposited region and the substrate is created to reduce mechanical and thermal problems as a buffer in interface regions. Design data of transition layers are obtained from experiments. Numerical analyses have been performed for deposited regions of dies. From the hot forging experiment, it has been shown that the proposed locally selective deposition technology with a buffer layer can help to dramatically improve the wear resistance of hot forging dies.

     

     

    ■  Conclusion

    A locally selective deposition technology with a TL using a DED process has been investigated to improve the wear resistance of a hot forging die. The TL between the deposited region and the substrate is created to reduce a thermal fatigue phenomenon. The influence of the TL design on deposition, hardness, and wear characteristics of the specimen has been investigated via experiments. From the results of the experiments, a single layer type of TL with a thickness of 1 mm and a 50% weight ratio of Stellite21 has been determined to be a suitable TL design. Through the comparison of wear characteristics of the deposited specimen with the TL and those of the SKD61 specimen, it has been shown that the proposed technology can improve the wear resistance of hot forging dies. Hot forging experiments for an axle shaft have been carried out to investigate the applicability and the benefits of the proposed technology. The wear map of the hot forging die has been created to estimate the deposited regions of the die via FEA. The design methodology and the fabrication procedure for the die have been discussed. The wear resistance of the designed die has been compared to that of the conventional die from viewpoints of wear characteristics of the die and quality of the product. From the results of the comparison, it has been shown that the proposed technology can dramatically improve the wear resistance of hot forging dies and the quality of the product. In the future, additional hot forging experiments are needed to investigate a practical service life of the designed die.

     

     

     

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