• 제목/요약/키워드: Variable-Runner System

검색결과 10건 처리시간 0.027초

Family 금형의 충전 균형을 위한 실험적 연구 (An Experimental Study for the Filling Balance of the Family Mold)

  • 박형필;차백순;이병옥
    • 소성∙가공
    • /
    • 제15권1호
    • /
    • pp.47-56
    • /
    • 2006
  • It is well known that the family-mold has an advantage to reduce the cost for production and mold. However, defects are frequently occurred by over packing the smaller volume cavity during molding, especially when the family-mold has a volumetric difference between two cavities. In this study, the cavity-filling imbalance was confirmed by the temperature and the pressure sensors, and a variable-runner system was developed for balancing the cavity-filling. Experiments of balancing the cavity filling was carried out in the family-mold with the variable-runner system, and balancing the cavity-filling was confirmed by changing the cross-sectional area of a runner in the variable-runner system with the temperature and pressure sensors. The influence of the injection speed to the balancing-capability of the variable-runner system was also examined in the experiment.

가변러너시스템에서 LDPE/ABS/PA6,6 수지의 충전균형 (The Filling Balance of LDPE/ABS/PA6,6 Resin in Variable-Runner-System)

  • 박형필;차백순;강중근;이병옥
    • 소성∙가공
    • /
    • 제15권9호
    • /
    • pp.641-647
    • /
    • 2006
  • During the injection molding process an excessive packing can occur in the smaller volume cavity because of volumetric difference of the family-mold. It causes warpage by increased residual stress in the product and flesh by over packing. In this study, we used a variable-runner system for the filling balance of the cavities by changing the cross-sectional area of a runner, and confirmed the filling imbalance by temperature and pressure sensors. We carried out experiments to examine the influence of types of resins such as LDPE/ABS/PA6,6 on the filling balancing of the system, in order to help mold designers, who can easily adopt the variable-runner system to their design. We also examined filling imbalance in the system with CAE analysis.

패밀리금형에서의 수지 유변학적 특성에 따른 가변러너의 성능 분석 (Perfomance analysis of variable runner according to materials rheological characteristics in family mold)

  • 최권일;박형필;차백순;이병옥;구본흥
    • Design & Manufacturing
    • /
    • 제2권6호
    • /
    • pp.23-27
    • /
    • 2008
  • It is well known that the family-mold has an advantage to reduce the cost for production and mold. However, defects are frequently occurred by over packing the smaller volume cavity during molding, especially when the family-mold has a volumetric difference between two cavities. In this study, the cavity-filling imbalance was confirmed by the temperature and the pressure sensors, and a variable-runner system was developed for balancing the cavity-filling. Experiments of balancing the cavity filling was carried out in the family-mold with the variable-runner system, and balancing the cavity-filling was confirmed by changing the cross-sectional area of a runner in the variable-runner system with the temperature and pressure sensors. The influence of the injection speed to the balancing-capability of the variable-runner system was also examined in the experiment.

  • PDF

가변 러너 시스템을 이용한 패밀리 금형의 충전밸런스에 관한 이론적 연구 (A Theoretical Study for the Filling Balance of the Family Mold Using Variable-Runner System)

  • 최권일;박형필;차백순;이병옥;구본흥
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2007년도 추계학술대회 논문집
    • /
    • pp.275-278
    • /
    • 2007
  • In family mold, defects are frequently occurred by an excessive packing the smaller volume cavity during molding. Although runner size could be optimized by CAE analysis or experimental data, the filling imbalance is hardly avoided in the actual injection molding process by various means. Before this study, we developed a variable-runner system for balancing the cavity-filling for three resins (ABS, LDPE, and PA66) in the family-mold, and examined the effect of cross-sectional area reduction of a runner in the system. In this study, we examined the conditions of the pressure and temperature in the system with a CAE analysis. We also analyzed the influence of the rheological characteristic of resins to the balancing-capability of the system in order to help mold designers easily adopt the variable-runner system to their design.

  • PDF

Family 금형의 충전 밸런스를 위한 실험적 연구 (An experimental study for the filling balance of the family mold)

  • 차백순;이병옥;박형필
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2005년도 금형가공,미세가공,플라스틱가공 공동 심포지엄
    • /
    • pp.132-140
    • /
    • 2005
  • It is well known that the family-mold has an advantage to reduce the cost for production and mold. However, defects are frequently occurred by over packing the smaller volume cavity during molding, especially whorl the family-mold has a volumetric difference between two cavities. In this study, we confirmed the cavity-filling imbalance by the temperature and the pressure sensors, and developed a variable-runner system for the cavity-filling balance. We carried out experiments fur balancing the cavity filling in the family-mold with the variable-runner system, and confirmed a balanced cavity-filing through analyzing the temperature and pressure change in each cavity as the cross-sectional area of the runner changed. We also examined the influence of the injection-speed to the balancing-capability of the variable-runner system in the experiment.

  • PDF

가솔린 엔진의 성능, 연비, 배출 가스를 동시에 고려한 시뮬레이션 기반 흡기 다기관 길이 최적화 (Simulation-based Intake Manifold Runner Length Optimization for Improving Performance, Fuel Consumption and Emission of a Gasoline Engine)

  • 강용헌;최동훈
    • 한국자동차공학회논문집
    • /
    • 제18권5호
    • /
    • pp.62-67
    • /
    • 2010
  • Exhausting fossil fuel and increasing concern of air pollution have brought on the change of the focus of developing new vehicles from performance to fuel economy and emission. The gasoline engines adopting the naturally aspirated way use the throttle-body for engine load control. Therefore, its pumping loss increases more than that of the diesel engine, and also mostly operating in a partial load condition has bad influence on fuel economy and emission. In these days, the continuous variable valve timing system and variable induction system are adopted in order to improve fuel consumption and emission. In this study, we optimize the runner length and operate region of variable induction system to simulataneously improve the performance, fuel economy, and emission of gasoline engine with employing GT-Power as a CAE tool for engine analysis and PIAnO as PIDO tool for process integration and design optimization.

다수 캐비티 사출금형에서 성형 인자가 충전 불균형에 미치는 영향 (Effects of processing Factors on Filling Imbalances in Multi-cavity Injection Mold.)

  • 강철민;정영득
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2004년도 추계학술대회논문집
    • /
    • pp.54-57
    • /
    • 2004
  • Almost all injection molds have multi-cavity runner for mass production, which are designed with geometrically balanced runner system in order to minimize filling imbalance between cavity to cavity during processing. However, even though geometrically balanced runner is used, filling imbalances have sometimes been observed. These filling imbalances have historically been considered as result of uneven mold temperature and mold deflection, but it actually results from non-symmetrically shear, pressure, temperature distribution within melt material as it flows through the runner system. Filling imbalance could be decreased by modifying processing conditions that are related to shear, pressure, temperature such as injection rate, mold temperature, injection pressure, melt temperature. In this study, a series of experiment was conducted using Taguchi method to determine which processing condition influence as the primary cause of filling imbalance in geometrically balanced runner system. As a result of experiments, this paper could present an optimal processing condition to minimize variable that brings about filling imbalance geometrically balanced runner system

  • PDF

CFD를 이용한 10kW급 모델 실험용 프로펠러 수차의 유량 및 러너 베인 깃 수 변화에 따른 성능해석 (Performance Analysis of 10kW Class Propeller Hydro Turbine by the Change of Flow Rates and the Number of Runner Vane Using CFD)

  • 박지훈;김유택;조용;김병곤;이영호
    • 한국유체기계학회 논문집
    • /
    • 제17권2호
    • /
    • pp.5-11
    • /
    • 2014
  • Small hydro power, among other renewable energy resources, has been evaluated to have enough development value because it is a clean, renewable and abundant energy resource. In addition, small hydro power has the advantage of low cost development by using existing facilities like sewage treatment plants, water works and similar resources. But in the case of small hydro power systems, there are problems with degraded operation efficiency of turbine due to changes in flow rates. In order to overcome this, variable speed control can be achieved by using the power rectifier and permanent magnetic synchronous generator(PMSG) as a possible method to respond to the changes in flow rates. In this study, a commercial ANSYS CFD code was used to analyze the performance of 10kW class propeller hydro turbine and to also investigate flow characteristics at variable flow rates and runner vane.

다수 캐비티의 사출성형품에서 충전의 불균형과 성형품 치수 편차의 교찰 (Investigation of the Filling Unbalance and Dimensional Variations in Multi-Cavity Injection Molded Parts)

  • 강민아;류민영
    • 폴리머
    • /
    • 제32권6호
    • /
    • pp.501-508
    • /
    • 2008
  • 렌즈나 휴대폰 부품 같은 소형 플라스틱 부품들은 일반적으로 다수 캐비티 사출금형에서 성형된다. 이러한 다수 캐비티 금형에서의 사출성형은 캐비티간의 충전 불균형이 일어날 수 있다. 이러한 충전 불균형 현상은 제품의 치수 및 중량의 편차뿐 아니라 제품의 물리적 특성에도 영향을 미친다. 충전 불균형은 무엇보다도 기하학적으로 균형 잡히지 않은 delivery system의 설계에서 기인된다. 하지만 delivery system이 기하학적으로 균형 있게 설계가 되었다 하더라도 충전 불균형 현상은 여전히 발생된다. 이러한 현상은 런너 단면에서의 온도분포에 기인하며 사출성형 공정 중 사출속도에 크게 영향을 받는 것으로 본 연구에서 파악되었다. 즉 충전 불균형은 부적절한 사출 성형 공정에 의해 발생되며 성형 공정 조건 중 사출속도는 충전에 영향을 주는 매우 중요한 요소이다. 본 연구에서는 재료와 사출 속도에 따른 충전 불균형 현상을 실험과 CAE을 통하여 관찰하였다. 사출속도 변화에 따른 충전 불균형 때문에 시편의 치수 및 무게가 불균일함을 확인하였다.

고정밀 체결토크 성능 너트런너 시스템 개발 (Development of High Precision Fastening torque performance Nut-runner System)

  • 김윤현;김솔
    • 한국산학기술학회논문지
    • /
    • 제20권4호
    • /
    • pp.35-42
    • /
    • 2019
  • 현재 자동차 산업과 함께 발전하고 있는 전자제품을 포함하는 전반적인 제조업 분야에서 초정밀 제어를 요하는 너트 체결기가 요구되고 있고 너트 체결시의 중요한 성능 요소는 체결력 부족에 의한 풀림과 과도한 체결에 의한 파손 및 강한 진동이나 외부 충격에 강건한 체결력 유지 등 조립 품질의 유지와 향상 및 제품 수명 보장을 위해 정확한 조임 토크, 각도 등이 요구된다. 현재 너트런너라는 제품명으로 판매되는 너트 체결기는 고토크 및 정밀토크제어, 정밀 각도제어 그리고 생산량 증대를 위한 고속운전 등의 특성들이 필요하며 고출력이 가능한 BLDC모터 및 너트체결기 전용의 정교한 토크제어에 필요한 고정밀 토크제어드라이버와 고속, 저속, 고응답의 정밀 속도 제어시스템의 개발이 요청되고 있으나 현재 고객이 요구하는 고정밀, 고토크 및 고속 작업특성을 만족시키지 못하고 있다. 따라서 본 논문에서는 정확한 체결 토크 및 고속 회전에서도 저진동 및 저소음을 구현할 수 있는 d축, q축의 좌표변환에 의한 벡터제어와 토크제어기반의 BLDC모터 가변속 제어와 너트런너의 제어 기술을 제안하고 여러 실험을 통해 성능 결과를 분석하여 제안한 제어가 너트런너 성능을 만족하는지를 확인 하였다. 또한 일단 운전 체결 방식(One Stage 운전 체결 방식)으로 패턴을 프로그램하여 10,000[rpm] 고속 운전 후 목표 토크로 정확히 체결됨을 확인하였으며 토크 리플에 의한 가체결 토크 검출의 문제점도 외란관측기을 사용하여 해결하였고 실험을 통해 검증하였다.