• 제목/요약/키워드: Injection time

검색결과 2,724건 처리시간 0.034초

레이저 절단 판재의 브레이징에 의한 저충 사출금형 (Laminated Injection Mold by the Brazing of Laser Cut Sheets)

  • 조용무;김재도
    • 한국정밀공학회지
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    • 제10권3호
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    • pp.231-238
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    • 1993
  • Mold-marking industries currently demands to reduce the tooling costs and time in mold making and to improve the productivity and quality in injection molding process. These problems can be easily solved by the laminated injection mold which is made by laser cutting metal sheets and bonding them by the brazing. Comparing with the conventional mold making technology which mainly depends on the machining, the new thchnology enables an arvitary design of cooling circuit whithout any restrictions of geometry. Therefore, it will offer high production tata of the injection molding processes. This paper evaluates the conventional and laminated injection mold making processes with a simple molding geometry, and also the cooling efficienty of the kinds of mold with the filling and cooling analyses. The results show that the laminated injection mold process takes much shorter time in tooling and cooling, and distributes temperatures more uniformly than the conventional one.

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대형 후육 LH형 탄성구조 프레임의 사출성형 최적화에 관한 연구 (A study on optimization of injection molding of large thick LH type elastic frame)

  • 이성희
    • Design & Manufacturing
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    • 제16권1호
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    • pp.62-69
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    • 2022
  • In the present study, the injection molding optimization of a large thick LH type elastic frames for the reduction of warpage was performed. Two kinds of fine and coarse finite element models were prepared to investigate the efficiency of analysis time and quality on simulation results. In order to derive injection molding conditions that can minimize distortion of parts, it was investigated that the effects of mold temperature, resin temperature, injection time, hold pressure switching time, holding pressure and the hold time on deformation characteristics using the design of experiments. The main influential factors on the warpage were found from the optimization simulation and the geometry data of the warpage result was converted into an initial model for injection simulation. It was shown that a coarse model with good mesh quality could be adapted for mold design since the total analysis time using the proposed model was reduced to 1/10. The suggested inversed warpage model produced the best minimized result of warpage.

SI 機關용 電子制御 燃料噴射노즐의 過渡的 現象 (The Transient Phenomena of Fuel Injection Nozzle for Electronic Control SI Engines)

  • 김신구;김덕줄;이충원
    • 대한기계학회논문집
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    • 제12권2호
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    • pp.308-318
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    • 1988
  • 본 연구에서는 가압된 액체를 가류실에 접선방향으로 도입하게 함으로써 선회운동에 의하여 미립화를 시키도록 스크류형의 선회분사 노즐을 설계제작하였다.

터널 콘크리트 구조물 균열에 에폭시 주입의 표준화에 대한 기초적 연구 (A basic study on the standardization of epoxy injection in cracks of tunnel concrete structures)

  • 백종명;장석재
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2005년도 추계학술대회 논문집
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    • pp.1235-1240
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    • 2005
  • In this status no inspection standard of quality in repair of present concrete structure has a problem to repair for simple experience. In this paper for this problem improvement, it made an analysis of relation to injection quantity of crack width, injection time of crack width, injection pressure of crack width, injection pressure and time, injection quantity of structural size, injection quantity of structural individual crack position, injection time about crack width. and structural thickness. The data gained in analysis result be judged that it will help in systematic quality control about concrete structural repair.

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퍼지-신경망을 이용한 미성형 사출제품의 최적해결에 관한 연구 (A Study on Optimal Solution of Short Shot Using Fuzzy Logic Based Neural Network(FNN))

  • Kang, Seong-Nam;Huh, Yong-Jeong;Cho, Hyun-Chan
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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    • pp.83-86
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    • 2001
  • In injection molding, short shot is one of the frequent and fatal defects. Experts of injection molding usually adjust process conditions such as injection time, mold temperature, and melt temperature because it is the most economic way in time and cost. However it is a difficult task to find appropriate process conditions for troubleshooting of short shot as injection molding process is a highly nonlinear system and process conditions are coupled. In this paper, a fuzzy neural network(FNN) has been applied to injection molding process to shorten troubleshooting time of short shot. Based on melt temperature and fill time, a reasonable initial mold temperature is recommended by the FNN, and then the mold temperature is inputted to injection molding process. Depending on injection molding result, specifically the insufficient quantity of an injection molded part, an appropriate mold temperature is recommend repeatedly through the FNN.

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인서트 변형을 고려한 배터리 케이스 사출 성형 해석 (Injection Molding Analysis of Battery case considering the Insert Deformation)

  • 안동규;김대원
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.1107-1112
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    • 2008
  • The objective of this paper is to investigate into the influence of the injection conditions on the insert deformation and the wall thickness of the injection part using the three-dimensional injection molding analysis. Full three-dimensional insert model was added to the injection molding analysis model to consider the effects of insert deformation during the injection molding process. In order to obtain the optimum injection molding condition with a minimum insert deformation, degree of experiments were utilized. From the results of the analyses, it was shown that the optimum injection condition is injection time of 1.6 sec, injection pressure of 30 MPa and packing time of 15 sec. In addition it was shown that the wall thickness is approached to target thickness when the core deformation is considered in the injection molding analysis.

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가스사출성형인자가 가스사출성형품의 중공부 형성에 미치는 영향 (Effects of Processing Variables on the Gas Penetrated Part of Gas-Assisted Injection Molding)

  • 한성렬;박태원;정영득
    • 한국정밀공학회지
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    • 제22권4호
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    • pp.144-150
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    • 2005
  • Gas-assisted injection molding (GAIM) process is reducing the injection pressure during mold filling required as well as the shrinkage and warpage of the part and cycle time. Despite of these advantages, this process introduces new parameters and makes the application more difficult because the process interacts between gas and melt during injection molding process. Important GAIM factors that involved in this process include gas penetration design, locations of gas injection points, shot size, gas injection delay time as well as common injection molding parameters, gas pressure and gas injection time. In this study, the experiments were conducted to investigate effects of GAIM process variables on the gas penetration for PP and ABS moldings by changing gas injection point. Taguchi method was used fer the design of experiment. When the gas was injected at cavity's center, the most effective factor was shot size. When the gas was injected at cavity's end, the most effective factor was melt temperature. Injection speed was also an effective factor in GAIM process.

Moldflow를 이용한 드럼세탁기 케이스의 사출성형공정에 관한 연구 (A study on the Injection Molding Process of the Case of Drum Type Washer using Moldflow)

  • 박철우
    • Journal of Advanced Marine Engineering and Technology
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    • 제33권1호
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    • pp.90-96
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    • 2009
  • 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. This report investigates that the optimum injection molding condition for minimum of shrinkage. Molding shrinkage is occurred by several reasons such as thermal shrinkage, a hardening process and compressibility. This report concentrate on shrinkage by a hardening process. As Change a holding pressure and holding time, checked deflections of X, Y, Z directions by shrinkage based on same condition. In conclusion, it was found that holding pressure is stronger and holding time is longer, the deflection by shrinkage is smaller because injection molding needs enough time for cooling and high density. The FEM Simulation CAE tool. Moldflow, is used for the analysis of injection molding process.

스팀사출성형에 의한 공정의 최적화 (Process optimization for the steam injection molding)

  • 문영대
    • Design & Manufacturing
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    • 제9권2호
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    • pp.10-15
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    • 2015
  • The water has been the suitable for the cooling medium until now. But the water as cooling medium seem to have the limit for high speed injection. The steam plastic molding injection use the steam as the medium when raise the mold temperature. The weld line has been the major quality problems in a plastic injection parts to be difficult to be solved. These problems in injection-molded plastic parts are difficult to find the reason because these issues are usually in tradeoff realtions with each other. The purpose of this paper is to obtain the optimum injection moulding condition for improving the quality of plastic injection parts and to inquire the productivity improvement with the measured cycle time by steam plastic moluding injection. Based on these numerical results, the guidelines of mould design and injection processing condition were established. As a result, the improvement of quality and the reduction of cycle time was achieved.

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사출금형의 급속냉각시스템 개발 (Development of Rapid Cooling System for Injection Mold)

  • 문영배;최윤식;정영득
    • Design & Manufacturing
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    • 제8권1호
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    • pp.31-34
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    • 2014
  • The Injection molding is used more than 70% of total production in plastic products. The injection molding process has 4 processes such as filling, packing, cooling and ejecting. It spends most of times in the cooling process. Therefore, it is important to control the mold temperature in producing plastic products. The cooling system and time affect the product's quality and productivity. Especially, cooling time has about 60% of total injection cycle time. Therefore, we can improve a productivity by shortening cooling time. In this study, the rapid cooling system was developed and performed a efficiency test. This system could refrigerate coolant to $1^{\circ}C$ and had to need 10 minutes for normal operating. However, if response time of temperature controller and sensor will be increased, the performance of this system will increase.

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