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http://dx.doi.org/10.5228/KSTP.2012.21.3.179

Numerical Analysis and Experimental Study of Thread Rolling Process for Micro-sized Screws(Part II: Application to a Micro-screw with Diameter of 800㎛)  

Song, J.H. (한국생산기술연구원)
Lee, J. (한국생산기술연구원)
Lee, H.J. (한국생산기술연구원)
Lee, G.A. (한국생산기술연구원)
Park, K.D. (한국생산기술연구원)
Ra, S.W. ((주) 서울금속)
Lee, H.W. (한국교통대학교 에너지시스템공학과)
Publication Information
Transactions of Materials Processing / v.21, no.3, 2012 , pp. 179-185 More about this Journal
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
Micro-screw; Flat Type Thread Rolling; Finite Element Analysis; $M0.8{\times}P0.2$;
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