• Title/Summary/Keyword: molding quality

검색결과 420건 처리시간 0.032초

다구찌의 강건설계 기법을 이용한 사출 성형품의 싱크 마크를 최소화하기 위한 사출성형 조건의 최적화 (Optimization of injection molding to minimize sink index with Taguchi's Robust Design technique)

  • 권윤숙;정영득
    • Design & Manufacturing
    • /
    • 제1권1호
    • /
    • pp.17-21
    • /
    • 2007
  • In the manufacture and processing of large plastic materials, product quality is tested and verified through several techniques such as injection processing, residual stress through injection molding and shrinkage. With regards to the injection molding process, common problems such as inconsistent density is seen when different points of the product are discovered to have varying thickness levels. Sink marks in product are then evident. This occurs when there is poor molding conditions caused about by poor runner and packaging systems incorporated into the process. We designed the runner system which is possible balanced filling to cavities using CAE program $Moldflow^{TM}$ and then obtained optimal processing conditions by Taguchi's Robust Design technique.

  • PDF

CAE 해석을 이용한 오토바이 리어카울 사출성형에 관한 연구 (A study on the motorcycle lear cowl injection molding by CAE analysis)

  • 성시명;정상준
    • Design & Manufacturing
    • /
    • 제13권4호
    • /
    • pp.34-39
    • /
    • 2019
  • In this paper, in order to improve the formability and quality of the injection molded parts in the molds for molding the motorcycle rear cowl injection molded parts with different volumes at the same time, the flow of the molded parts is changed through the injection molding CAE analysis by changing the gate position, runner size and position. It is to find the optimum gate position, the diameter of the runner and the position where the balance is equal. The molded article formed by the optimization resulted in the uniformity of the molten resin at the same time at the corner of the product, thereby maintaining the flow balance favorable for mass production at lower injection pressure.

3차원 입체요소를 사용한 정밀 전자부품의 사출성형 해석 (Numerical Analysis for Injection Molding of Precision Electronics Parts Using Three-Dimensional Solid Elements)

  • 박근;박제현;최상련
    • 소성∙가공
    • /
    • 제11권5호
    • /
    • pp.414-422
    • /
    • 2002
  • Most of numerical analyses for injection molding have been based on the Hele Shaw's approximation: two-dimensional flow analysis. In some cases, that approximation causes significant errors due to loss of geometrical information as well as simplification of the flow characteristics along the thickness direction. The present work covers numerical analyses of injection molding using three-dimensional solid elements. The accuracy of the analysis results has been verified through some numerical examples in comparison with the classical shell-based approach. The Proposed approach is then applied to predict product defects and to improve flow characteristics for a precision electronics part. In addition, design of experiment has been utilized in order to find the optimal process conditions for better product quality.

3차원 입체요소를 사용한 정밀 전자부품의 사출성형해석 (Numerical Analysis for Injection Molding of Precision Electronics Parts using Three-Dimensional Solid Elements)

  • 박근;박제현;최상련
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2002년도 금형가공 심포지엄
    • /
    • pp.68-75
    • /
    • 2002
  • Most of numerical analyses for injection molding have been based on the Hele Shaw's approximation: two-dimensional flow analysis. In some cases, that approximation causes significant errors due to loss of geometrical information as well as simplification of the flow characteristics along the thickness direction. The present work covers numerical analyses of injection molding using three-dimensional solid elements. The accuracy of the analysis results has been verified through some numerical examples in comparison with the classical shell-based approach. The proposed approach are then applied to predict product defects and to improve flow characteristics for a precision electronics part. In addition, design of experiment has been utilized in order to find the optimal process conditions for better product quality.

  • PDF

금형·성형 기술을 위한 생산기반 지식공유형 플랫폼 개발 (Development of Knowledge Sharing Platform for Molding & Forming Technology)

  • 배성민;이형욱;허영무;신광호;이정원;윤길상
    • 소성∙가공
    • /
    • 제20권8호
    • /
    • pp.534-539
    • /
    • 2011
  • The production technology is the basic of manufacturing for various materials and components. This technology can influence the quality and productivity of leading export products such as automobile, ship, and electronic device. Besides, the production technology is very useful to apply to other manufacturing fields and has a great ripple effect. However, it is very difficult to make the production technology into standardization and knowledge-based database because the production technology is dependent in hands-on experience. In this study, the knowledge-sharing platform for the molding & forming technology which is a branch of the production technology is introduced. This platform is web-based system and has the knowledge authoring tool technologies storage, semantic database, and web portal service. Therefore, the molding & forming technology can be shared and spread easily by the knowledge-sharing platform.

사출성형시 성형조건이 웰드라인의 생성에 미치는 영향 (Effects of Injection Conditions on the Weld Line Creation in Injection Molding)

  • 김영모;박영민;장민규;정영득
    • 한국금형공학회:학술대회논문집
    • /
    • 한국금형공학회 2008년도 하계 학술대회
    • /
    • pp.115-119
    • /
    • 2008
  • Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study, ABS and PP were used as experimental materials. And weld line length, depth and strength have been examined according to the injection molding conditions. As the results of experimental studies, weld line length increased as flow rate increases for all materials. And the flow rate is most influenced to the creation of weld line length. Also weld line strength increased, as flow rate and melt temperature increase for all materials. The whole experiment results was similar to CAE analysis results.

  • PDF

사출성형품질 개선을 위한 실무금형교육에 관한 연구 (A Study on Practical Tool Education for Improving Injection Molding Quality)

  • 신주경
    • 실천공학교육논문지
    • /
    • 제8권2호
    • /
    • pp.121-128
    • /
    • 2016
  • 사출 성형 공정에서 외관 품질 문제는 대부분의 성형품에서 발생한다. 금형의 열역학적 설계 중의 하나는 어떠한 위치에서 캐비티 표면 온도가 되도록 균일하게 상승하는 것으로 수행된다. 실험적인 평가를 바탕으로 최적의 사출 성형 조건에서 성형품의 미려한 외관 품질을 위해서 캐비티 벽 온도와 다듬질 가공된 캐비티 표면이 성형품의 외관 문제를 피할 수 있는 가장 중요한 요소이다. 또한 잘못된 게이트 형식과 위치 선택은 성형품의 품질에 상당한 영향이 있어서, 각 캐비티로 부터 올바른 러너 밸런스를 유지하는 것은 매우 중요하다. 실질적으로 생산 현장에서 이행될 수 있는 사출 성형 품질을 위한 최적의 금형 설계와 실무 금형 기술 능력 향상을 위해서 현장 교육을 위한 실무적인 금형기술 과정의 교육훈련 모델을 제시하였다.

CAE와 실험계획법을 연계한 사출 성형 시스템 최적화에 관한 연구 (A Study on Optimization of Injection-molded System Using CAE and Design of Experiment)

  • 오정열;허용정
    • 한국산학기술학회논문지
    • /
    • 제7권3호
    • /
    • pp.271-277
    • /
    • 2006
  • 사출 성형 공정은 저비용으로 고품질의 제품을 대량으로 얻을 수 있는 제조 공정이지만. 성형품의 품질에 영향을 주는 인자의 수가 너무 많아 모든 경우에 대하여 실험을 수행하는 것은 시간적, 경제적으로 불가능하다. 따라서 최근에 시뮬레이션 도구를 활용하여 이러한 실험을 보조하고 있고, 실험계획법 및 여러 가지 최적화 기법들이 다루어지고 있다. 인자수가 많은 경우 각 입력인자 간의 교호작용 등도 고려하면서도 실험 횟수를 줄이는 기법으로 정립된 실험계획법을 적용하여 시뮬레이션 소프트웨어를 이용한 모의 실험 데이터를 도출하였으며, 이를 바탕으로 주변의 잡음에서도 강건한 설계를 할 수 있는 다구찌 기법을 사출 성형 공정에 적용하여 최적의 사출 성형 공정 조건을 나타내었다.

  • PDF

Multi-Nozzle Injection Molding Automatic Machine 개발에 관한 연구 (A Study on the Development of an Automatic Multi-Nozzle Injection Molding Machine)

  • 이종형;김정환;이창헌;김윤곤;임춘규;이춘곤;권영신
    • 한국산업융합학회 논문집
    • /
    • 제10권2호
    • /
    • pp.123-128
    • /
    • 2007
  • The demand for the precision rubber products has been rapidly increasing with the recent growth of industries. And the requirement for the productivity and the quality calls out for the injection molding machines with the precision machining ability as well as the high productivity. Especially modern automobile industry is in urgent need of developing injection molding machines for the high quality rubber products with high productivity. And the inability of the domestic companies to meet the standards causes importing foreign machines and as a result spending good amount of dollars. It is extremely important to develop competitive machines and strengthen the infrastructure of the related industries. In this paper the functions and the structure of a automatic multi-nozzle injection molding machine has been studied to set up a proper test system for the precision rate and the reliability of the machines, which can help build the machines to meet the request of the industry.

  • PDF

가스사출성형을 이용한 자동차 내장부품 개발 사례에 관한 연구 (A Case Study on Development of Automotive Interior Parts using Gas Assisted Injection Molding Process)

  • 김홍석;이덕영
    • 소성∙가공
    • /
    • 제14권5호
    • /
    • pp.452-459
    • /
    • 2005
  • Gas assisted injection molding (GAIM) is an innovative low-pressure injection molding technique that can provide numerous benefits such as reduced part warpage, excellent surface quality without sink marks, low injection pressure and greater design flexibility. However, adoptions of GAIM may cause unexpected defects since it requires many subtle design factors such as resin shot size, delay time and gas injection pressure, which wouldn't be considered in conventional injection molding process. Therefore, experiences applying GAIM should be collected and examined in order to establish design rules of the new technique. The purpose of this paper is to summarize developing cases of three automotive interior parts such as instrument panel, map pocket folding and center facia side panel so that possibilities and limitations of GAIM were examined. As a result, it is necessary to consider characteristics of GAIM at the initial stage of part design in order to obtain various advantages of the GAIM process without occurring severe defects, which would increase time and cost required to the part development.