Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Numerical Analysis and Experimental Study of Thread Rolling Process for Micro-sized Screws(Part II: Application to a Micro-screw with Diameter of 800㎛)

마이크로 체결부품 전조성형공정에 관한 해석 및 실험적 고찰(Part II: M0.8급 마이크로 스크류 전조공정 적용)

  • Received : 2011.11.01
  • Accepted : 2012.04.04
  • Published : 2012.06.01
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Abstract

In this paper, it is proposed to produce high precision screws with a diameter of $800{\mu}m$ and a thread pitch of $200{\mu}m$ ($M0.8{\times}P0.2$) by means of a cold thread rolling process. In this part II of the study, the focus is on the production and reliability testing of the prototype $M0.8{\times}P0.2$ micro-screw. Designs for two flat dies were developed with the aid of the literature and previous studies. Process parameters during the cold thread rolling process were established through FE simulations. The simulation results showed that the threads of the micro-screw are completely formed through the rolling process. Prototype $M0.8{\times}P0.2$ micro-screw were fabricated with a high precision thread rolling machine. In order to verify the simulation results, the deformed shape and dimensions obtained from the experiment were compared with those from the simulations. Hardness and failure torque of the fabricated micro-screw were also measured. The values obtained indicate that the CAE based process design used in this paper is very appropriate for the thread rolling of micro-sized screws.

Keywords

References

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Cited by

  1. Finite Element Analysis for Improvement of Folding Defects in the Forging Process of Subminiature Screws vol.32, pp.6, 2015, https://doi.org/10.7736/KSPE.2015.32.6.509
  2. Investigation into Thread Rolling Characteristics of Subminiature Screws According to Thread Shapes vol.40, pp.11, 2016, https://doi.org/10.3795/KSME-A.2016.40.11.971