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Characteristics of Surface Hardening of Dies Steel for Plastic Molding using Continuous Wave Md:YAG Laser  

Shin, Ho-Jun (Department of Precision Engineering, Graduate School Chosun Univ.)
Yoo, Young-Tae (Department of Mechatronics Engineering, Chosun Univ.)
Oh, Yong-Seak (Department of Advanced Parts and Materials Engineering, Graduate School Chosun Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.26, no.1, 2009 , pp. 71-81 More about this Journal
Abstract
Die steel for plastic molding were used as mold material of automobile parts and electronic component industry. The material of this paper has superior to mechanical properties, such as repair weldability, corrosion resistance and high temperature strength, required mold parts for semitransparent. Laser-induced surface hardening technology is widely adopted to improver fatigue life and wear resistance via localized hardening at the surface of mold parts. The objective of this research work is to investigate on the characteristics of surface hardening of the laser process parameters, such as beam travel speed, laser power and defocsued spot position, for the case of die steel for plastic molding. Lens for surface hardening of large area is plano-convex type with elliptical profile to maintain uniform laser irradiation. According to the experimental results, large size of hardened layer at the surface of die steel for plastic molding was achieved, and microstructure of this layer was lath martensite. Optimal surface status and mechanical property of hardened layer could be obtained at 1095Watt, $0.25{\sim}0.3m/min$, 0mm (focal length: 232mm) for laser power, beam travel speed, and focal position. Where, heat input was $0.793{\times}10^{3}J/cm^2$, and width of hardened layer was 27.58mm.
Keywords
Laser Surface Hardening; Dies Steel for Plastic Molding; Infrared Pyrometer; Line Scanning Analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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