• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.04a
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• pp.130-134
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• 1996

The characteristics of AE(Acoustic Emission) signal is related to cutting conditio, tool material, and tool geometry in metal cutting. The relation between AE signal and tool life was investigated experimentally. Experiment is carried out by gear shaping and SCM 420 workpiece. AE RMS voltage were increased according totool wear. It is suggested that maximum value of AE RMS voltage is an effective parameter to monitor tool life.

• Journal of the Korean Graphic Arts Communication Society
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• v.9 no.1
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• pp.45-51
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• 1991

Commercially available paper stickers, electrostatic stickers, and metal sticker generally involve process of printing on the substrate and die-cutting to peel the sticker off the release paper. Using plastisol ink and multi-layer screen printing technique, a process of non die-cutting sticker with same image on both sides was developed. It was also possible to prevent color mixing phenomena at image edge part by printing narrow lines of black ink along the borderline.

• Journal of the korean Society of Automotive Engineers
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• v.9 no.3
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• pp.66-75
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• 1987

The determination of stress distributions on the rake face of tool are important to understand the mechanism of metal cutting. For this reason, many researchers have been payed much effort to analyize machining stress distribution on the rake face. The author's photoelastic experiment has shown that the stress distributions on a rake face can be obtained photoelastically by using a specially designed tool made of epoxy resin plate, and also, Stress Intensity Factors $k_{I}$, $k_{II}$ and Crack Extension Angle can be deter mined by using Linear Elastic Fracture Mechanics.ics..

• Journal of the Korean Society for Precision Engineering
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• v.5 no.1
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• pp.29-39
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• 1988

Plastically deformed layer beneath metal surface machined by orthogonal cutting was evaluated in terms of residual stress, microvickers hardness, side spread, and the side strain. An attempt was made to predict the depth of layer according to machining conditions particularly tool geometry and the shear plane angle. In this paper, we employed two models concerning the sliplines. The exact model was validated by comparision of computed and measured tool force and its angle, and the model offers an upper boundary of the deformed layer to be in good agreement with the experiment.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.11a
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• pp.179-180
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• 2007

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.731-732
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• 2009

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2019.05a
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• pp.303-304
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• 2019

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2018.11a
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• pp.450-451
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• 2018

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.632-635
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• 2008

Concurrent engineering concept is used in factory automation recently. In this paper, described instance that apply concurrent engineering production concept in sheet metal cutting process. Automation system to produce metal parts designed by Client/server structure, and designed NC postprocessor on inside. Also, in this paper, when handled all justices of part production by breakup design of concurrent engineering, proved can shorten tine required in product manufacture than system past.

• Clean Technology
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• v.22 no.4
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• pp.274-280
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• 2016

In this study, it was to develop a chemical method that can recycle the cutting oil which accounts for about 25% of the cost of the process among containing materials of silicon waste sludge generated in the process for producing a solar cell wafer. The 7 types of reagents have been used, including acetone, HCl, NaOH, KOH, $Na_2CO_3$, HF, $CH_2Cl_2$, etc. for this experiment. And It was carried out at a speed of 3000 rpm for 60 minutes centrifugation after performing a reaction with a waste sludge at various concentrations. As a result, the best reagents and conditions for separating the solid such as a silicon powder and a metal powder and liquid cutting oil were identified as 0.3 N NaOH. It is found to be pH 6.05 in a post-processing recycled cutting oil with 0.3 N NaOH after reaction of waste sludge and 0.1 N HCl which is effective to remove metal powder in order to adjust the pH to suit the properties of the weak acid is a commercially available cutting oil and it showed excellent turbidity than when applied to sludge with 0.3 N NaOH alone. The results of FT-IR analysis which can compare the properties of the commercially available cutting oil shows it has a possibility of recycling oil. The cutting oil recovery rate obtained through the experiment was found to be 86.9%.