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연규현(Kyu-Hyun Yon),김형국(Hyung-Kook Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
Plastic sound-proof wall is an installation-structure to absorb noise and it is consist of main plate, sound absorption plate and sound absorption material. Plastic sound-proof wall has many advantages compared to existing products - light weight, anti-corrosion, long durability, easy assembly, fast construction and low cost. In this study, instead of injection molding, extrusion molding process was applied to fabricate main plate. New plastic sound-proof wall was made by assembling main plate and sound absorption plate made by press machine. In this process, extrusion molding dies and punch die were designed and profile extrusion molding process system was developed.
연규현(Kyu-Hyun Yon),김형국(Hyung-Kook Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
Plastic sound-proof wall is an installation-structure to absorb noise and it is consist of main plate, sound absorption plate and sound absorption material. Plastic sound-proof wall has many advantages compared to existing products - light weight, anti-corrosion, long durability, easy assembly, fast construction and low cost. In this study, instead of injection molding, extrusion molding process was applied to fabricate main plate. New plastic sound-proof wall was made by assembling main plate and sound absorption plate made by press machine. In this process, extrusion molding dies and punch die were designed and profile extrusion molding process system was developed.
연규현(Kyu-Hyun Yon),김형국(Hyung-Kook Kim) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
The analysis of injection molding process by CAE is widely used in development of plastic products. That comes from the fact that CAE analysis can reduce trial and error based on optimized design. On this study, by use of MOLDFLOW, the causes of product defects were found and solved by trade-off study. CAE analysis includes Flow-Cool-Warpage Analyses and finally a new mold-die design with better product quality was suggested. On injection molding of round-shaped plastic fan, new mold-die system with 4-tunnel gates located on the edge of a fan disc shows better quality rather than pin-point gate located on the center of a disc. That was effective in terms of flow mark removal and flatness improvement of the product.
김형국,연규현,Kim, Hyung-Kook,Yon, Kyu-Hyun 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
On this study, injection molding product of rectangular tray structure with thickness 0.25mm and aspect ratio(length/thickness) approximately 150 conducted. Technical aspects were reviewed on mold-die design and injection molding conditions. To have a thin-membraned plastic part, short-shot, shrinkage, twist, whitening and flash problems were considered and resolved. After measuring products, validity of this study and future improvement were discussed.
김형국(Hyung-Kook Kim),연규현(Kyu-Hyun Yon),윤지용(Ji-Yong Yoon) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
On this study, plastic injection molding of rectangular tray structure with thickness 0.25㎜ and aspect ratio(length/thickness) approximately 150 conducted. Technical aspects were reviewed on mold-die design and injection molding conditions. To have a thin-membraned plastic part, short-shot, shrinkage, twist, whitening and flash problems were considered and resolved. After measuring products, validity of this study and future improvement were discussed.
김형국(Hyung-Kook Kim),연규현(Kyu-Hyun Yon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The analysis of injection molding process by CAE is widely used in development of plastic products. That comes from the fact that CAE analysis can reduce trial and error based on optimized design. On this study, by use of MOLDFLOW, the cause of product defects were found and solved by trade-off study. CAE analysis includes Flow-Cool-Warpage Analyses and finally new mold-die design with better product quality was suggested. On injection molding of round-shape plastic fan, new mold-die system with 4-tunnel gates located on the edge of a fan disc shows better quality rather than pin-point gate located on the center of a disc. That was effective in terms of flow mark removal and flatness improvement of the product.
김형국(Hyung-Kook Kim),연규현(Kyu-Hyun Yon),송성종(Seung-Jong Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
On this study, technical aspects were reviewed to drill a series of micro holes (φ0.10) over 200 within a few micron tolerance in diameter and position on the stainless steel material. Dedicated tools & jigs were designed and manufactured and optimum cutting conditions were found. On this micro hole drilling process, guide drill and step feeding were applied to help chip discharge, prevent drill breakage and finally improve the accuracy of positioning and roundness. The processing results indicated that most holes are distributed within a few micron tolerance in diameter and position intervals.