Title: Design and optimisation of micro forging system to reduce parasitic motion

Authors: Changho Jung; Byung-Joo Choi; Hyunho Yeom; Moon Gu Lee; Yongho Jeon

Addresses: Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Suwon, 16419, South Korea ' Department of Mechanical Engineering, Ajou University, Worldcupro 206, Yeongtong-gu, Suwon, 16499, South Korea ' Department of Mechanical Engineering, Ajou University, Worldcupro 206, Yeongtong-gu, Suwon, 16499, South Korea ' Department of Mechanical Engineering, Ajou University, Worldcupro 206, Yeongtong-gu, Suwon, 16499, South Korea ' Department of Mechanical Engineering, Ajou University, Worldcupro 206, Yeongtong-gu, Suwon, 16499, South Korea

Abstract: As the demand for high reliability in mechanical parts increases, micro forging technology is drawing attention. In forging by a vibration tip, the straightness of the processing direction is important, and as the parasitic motion in the other direction is lower, the stress that is applied to the specimen is concentrated so that a stronger effect can be achieved. In this study, box-like, closed structure forging system to minimise parasitic displacement is designed and optimised by Taguchi method. A resonant frequency and a mode shape were analysed by means of a modal analysis. The processing direction displacement and parasitic displacement generated in the excitation horn was assessed by means of a harmonic analysis that actually added an excitation force. The displacement was measured to verify the design model and tested by very-high-cycle fatigue life testing. The results confirmed that the fatigue life was improved by micro forging.

Keywords: micro forging system; parasitic motion; fatigue life; S-N curve.

DOI: 10.1504/IJMPT.2017.087051

International Journal of Materials and Product Technology, 2017 Vol.55 No.4, pp.392 - 409

Received: 31 Oct 2015
Accepted: 24 Nov 2016

Published online: 05 Oct 2017 *

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