• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.11
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• pp.5352-5356
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• 2013

Plastic product manufacturing industry has usually focused on a mechanical and physical characteristics of molding. Recently, not only these characteristics but also the aesthetic value is significantly considering. Especially, the molding's gloss, which we can easily distinguish, is an important aesthetic point. In this study, it were investigated that the gloss variation of ABS moldings by changing injection conditions such as injection pressures, injection speed, holding pressures melt and mold temperatures by injection molding experiment. The experimental results revealed that the holding pressure was the most active condition on gloss of ABS molding.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.10
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• pp.1549-1554
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• 2010

Recently, plastic screws have replaced metal screws because of the former's light weight, thermal and electrical insulating properties, and anticorrosion characteristics. Plastic screws are usually produced by injection molding, which involves material shrinkage during the solidification of the polymer. This shrinkage results in the degeneration of the dimensional accuracy. In the present study, the effect of injection-molding conditions on the dimensional accuracy of plastic screws was investigated through a numerical simulation of injection molding; on the basis of this simulation, we could determine the mold-design parameters. The design of experiment was applied in accordance with the numerical analysis in order to optimize the injection-molding conditions with a view to improving the dimensional accuracy of the precision plastic screw.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.1
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• pp.39-46
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• 2013

This study aims to develop a plastic aspheric lens for a 13-megapixel mobile phone camera by injection-compression molding. A mold for injection-compression molding experiments was fabricated with a movable upper plate and four springs. During cavity filling for an aspheric lens with a thickness ratio of 2, a weldline was formed under conventional injection molding, whereas no weldline was formed under injection-compression molding with a compression stroke of 0.3 mm. The flow patterns were in good agreement with the simulation results. The birefringence decreased as the compression stroke increased, and the birefringence produced by injection-compression molding was very low and more uniform compared with that produced by injection molding. In addition, the bulk birefringence of an assembly composed of four plastic lenses was significantly affected by the orientation of the lenses to be mounted.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.2
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• pp.289-295
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• 2010

Injection molding process is one of the most important methods to produce plastic parts with high efficiency and low cost. Today, injection molded parts have been increased dramatically the demand for high strength and quality applications. In this study, In-line skates are made of Al alloy and plastic materials to replace the frame for the optimization process is all about. I interpreted through mold design, Injection molding process that minimizes the runner and the gate dimension will determine the size and shape. Runner and gate dimensions of change based on availability of the product, I'll discuss the injection molding. This report investigates that the optimum injection molding condition for minimum of shrinkage. The FEM Simulation CAE tool, Moldflow, is used for the analysis of injection molding process.

• Proceedings of the Safety Management and Science Conference
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• 2011.04a
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• pp.559-570
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• 2011

생산재와 소비재의 반제품을 이루고 있는 플라스틱 부품들이 다른 소재의 제품들을 대체하면서 급속히 증가하고 있다. 이는 사출성형의 공정으로 생산되는 제품들이며 플라스틱의 기능과 특성이 우수하다는 장점과 더불어 제품구현이 빠르고 대량생산이 가능하기 때문이기도 하다. 본 연구에서는 제조설비시스템(MES)를 임베디드 장치를 장착하여 플라스틱 사출금형으로 반제품을 생산하는 과정에서 공정상에 발생하는 이상 증후에 대한 진단과 장시간 생산이 진행되는 과정에서 사출성형조건의 지속성 유지의 문제점을 실시간으로 모니터링하여 예방과 대책 방법을 제시한다. 품질이상을 감지하기 위해 온도, 압력, 시간을 측정하기 위한 센서와 인터페이스 설계를 통해 작업자의 판단상황을 객관적으로 설치전과 후의 경제성 분석을 하였다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2004.05a
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• pp.191-194
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• 2004

본 연구는 차세대 반도체 칩 패키징 재료로 검토되고 있는 열가소성 수지(Thermoplastic resin)의 사출성형에 있어서의 불량과 그에 따른 해결책을 Visual Basic을 이용하여 전산 정보화함으로써 성형 불량 대책을 제공하는 지적 결정 시스템을 개발하였다. 체계적인 기술이 정립되어 있지 않는 플라스틱 성형의 문제점을 최소화하고 재료비 절감 설계 납기일 단축, 제품 품질 향상을 그 목적으로 하고 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.11
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• pp.1507-1514
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• 2011

Injection molding is the most commonly used process that uses plastic material. Today, the uses of plastic material are continuously increasing, and the range of application is also being extended by the development of novel materials. An inline skate consists of 4 components: the boot, frame, wheel and brake. Among these components, the frame is the most critical. The injection formability for a variety of injection materials for inline skate frames was studied. We also studied the injection formability of the product for various sizes of the runner and gate. In this study, injection molding analysis was performed using MOLDFLOW, and structural analysis was performed using ANSYS.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.10
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• pp.1487-1492
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• 2010

The objective of this study is to design the conformal cooling channels for the mould of a plastic drawer of a refrigerator by analysis of three-dimensional injection molding. In order to obtain the desired design of the conformal cooling channels, the influence of the diameter and the position of the conformal cooling channels on the moulding characteristics and the product qualities were quantitatively examined. From the results of the examination, an optimal design of the conformal cooling channels, which ensures uniform cooling and minimum potential deformation of the molded drawers, was estimated. By comparing the designed mould and a conventional mould with linear cooling channels from the viewpoints of the product qualities as well as cooling and cycle times, it was shown that the mould with conformal cooling channels can simultaneously improve the productivity of the injection moulding process and the product qualities.

• 월간산업보건
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• s.80
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• pp.8-16
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• 1994

이 글을 보건관리대행업무를 수행하는데 필요한 플리사틱 사출성형업체의 건강위험성을 파악하는데 참고자료로 이용하기 위하여 정리한 것입니다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.4713-4718
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• 2013

Nowadays, three-dimensional computer added design(3D CAD) tool are widely and actively used for design of mechanical machine. Because using the tool is more effective to understand design concept and to collaborate with other operation than using two-dimensional design tool. In this study, the 3D CAD tool which is called I-DEAS was applied for three-dimensional modeling of main parts and assembling of modeled parts for identification the entire shape of a injection molding machine. In addition, a study was also performed regarding reduction for the weight of main plates for saving production cost and energy in the machine. A finite element method(FEM) program in I-DEAS tool was used for the improvement study. First, the current main plates were structural analysed and then the plate deformations, weak regions and stress distributions were graped. By the FEM results, the 2nd improved designing of the plates was conducted such as reinforcement or slimming of the plate wall thickness. The 2nd structural FEM was performed for verification of the redesigned plates and then the FEM results were compared with the 1st FEM's result. The weight of the main plates were averagely reduced approximately 3 - 7%. By these results, it was seemed that the improved plates have a useful availability.