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JKSPE : Journal of the Korean Society for Precision Engineering

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"Ju-Hwan Kim"

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"Ju-Hwan Kim"

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Improvement of Punch Life and Contact Stamping Quality in Ultra-High Speed Press
Ju-Hwan Kim, Hyun-Pyo Shin
J. Korean Soc. Precis. Eng. 2019;36(10):961-967.
Published online October 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.10.961
In recent years, the manufacture connector terminals of electronic devices require an accuracy of several microns and high productivity, thus the need to develop the ultra-high speed press technology. However, increased impulse and vibration of ultra-high speed press have reduced durability of stamping die and induced serious tool wear. To solve this problem, we investigate the changes of vibrations occurring in the die and press machine under ultra-high speed working condition by using a piezoelectric sensor. Moreover, by analyzing the design parameters such as stroke, stripper movement, and collision velocity of the die, impulse and vibration were decreased, thus improving the punch life by 50% under 2,000 SPM (stroke per minute) condition
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The Static Overload Effect Estimations on Fatigue Strength by the The Measurement of Local Strain Variation at The Weldment Toe
Hyun-Woo Lee, Ju-Hwan Kim, Hyun-Jae Kim
J. Korean Soc. Precis. Eng. 2001;18(6):59-66.
Published online June 1, 2001
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