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박근,이상찬,정준호,양동열,윤재륜,Park, K.,Lee, S.C.,Jung, J.H.,Yang, D.Y.,Yoon, J.R. 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
Rapid prototyping is a new prototyping technology which produces three dimensional part models directrly from CAD data and has been extensively applied to various manufacturing processes. There are many types of rapid prototyping systems due to their building principles and materials. In this work, Stereolithography Appaaratus(SLA) which is the most widely-used rapid prototyping system is introduced to achieve die/mold technology innovation. For the purpose, the prototyping technology using SLA is developed such that patterns of which shapes are quite complicated are successfully produced with high accuracy. Using these patterns, prototype die/molds are efficientrly manufactured; a turbocharger rotor, a fan and a wheel patterns, prototype die/molds are efficienterly manufactured ; a turbochager rotor, a fan and a wheel pattern are made, and the molds of the investment casting, the injection molding and the die casting are manufactured respectively. The casting products are produced using these molds and it turns out that these methods are quitre effective for manufacturing products of complicated geometry from the viewpoint of efficiency and productivity.
고주파 유도가열을 사용한 초박육 플라스틱 제품의 사출성형
박근(K. Park),최선(S. Choi),이세직(S. J. Lee),정현우(H. J. Woo),김영석(Y. S. Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Rapid mold heating has been recent issue to enable the injection molding of thin-walled parts or micro/nano structures. Induction heating is an efficient way to heat material by means of an electric current that is caused to flow through the material or its container by electromagnetic induction. It has various applications such as heat treatment, brazing, welding, melting, and mold heating. The present study covers an experimental investigation of induction heating in order to rapidly raise the mold temperature. It is observed that the mold surface temperature is raised up to 200 C in 2 seconds. This induction heating is applied to injection molding of a flexspline for a plastic harmonic drive, which has difficulty in cavity filling because its minimum thickness is only 0.35 ㎜. The induction heating is then successfully implemented on this ultrathin wall molding by raising the mold surface temperature around the glass-transition temperature of the molding material.