Search | Korea Science

Jeong, Byoung-Guk;Kwon, Hong-Kyu
- Journal of Korean Society of Industrial and Systems Engineering
- /
- v.38 no.1
- /
- pp.44-51
- /
- 2015
When manufacturing die casting mold, generally, the casting layout design should be considered based on the relations of injection system, casting condition, gate system, and cooling system. According to the various relations of the conditions, the location of product defects was differentiated. High-qualified products can be manufactured as those defects are controlled by the proper modifications of die casting mold with keeping the same conditions. In this research, Computer Aided Engineering (CAE) simulation was performed with the several layout designs in order to optimize the casting layout design of an automotive part (Housing). In order to apply them into the production die-casting mold, the simulation results were analyzed and compared carefully. With the filling process, internal porosities caused by air entrapments were predicted and also compared with the modification of the gate system and overflow. With the solidification analysis, internal porosities occurring during the solidification process were predicted and also compared with the modified gate system. The simulation results were also applied into the production die-casting mold in order to compare the results and verify them with the real casting samples.
https://doi.org/10.11627/jkise.2014.38.1.44 인용 PDF KSCI

Noh, Ji-Whan;Lee, Jae-Hoon;Shin, Dong-Sig;Sohn, Hyon-Kee;Suh, Jeong;Oh, Jeong-Seok
- Journal of the Optical Society of Korea
- /
- v.13 no.1
- /
- pp.75-79
- /
- 2009
A four beam interference optical system for laser micro structuring using a pulse laser was demonstrated. The four beam interference optical system using a pulse laser(picosecond laser) can fabricate micro structure on mold material(NAK80) directly. Micro structure on the polymer can be reproduced economically by injection molding of the micro structure on the mold material. The four beam interference optical system was composed by the DOE(Diffractive Optical Element) and two lenses. The laser intensity distribution of four beam interference was explained by an interference optics point of view and by the image optics point of view. We revealed that both views showed the same result. The laser power distribution of a $1{\mu}m$ peak pattern was made by the four beam interference optical system and measured by the objective lens and CCD. A $1{\mu}m$ pitch dot pattern on the mold material was fabricated and measured by SEM(Scanning Electron Microscopy).
https://doi.org/10.3807/JOSK.2009.13.1.075 인용 PDF KSCI