• 제목/요약/키워드: Manufacturing pressure

검색결과 1,604건 처리시간 0.037초

전자제품 쿨링 유닛용 초소형 타입 복합재 압력용기 개발 (Development of Subminiature Type 3 Composite Pressure Vessel for Cooling Unit in Electric Appliances)

  • 조성민;이승국;문종삼;류성기
    • 한국기계가공학회지
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    • 제17권6호
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    • pp.151-157
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    • 2018
  • In this study, we have developed a composite pressure vessel that is compact and can store refrigerant at high pressure to increase the refrigerant volume. The composite pressure vessel is made of aluminum-based duralumin, which has high rigidity and excellent elongation in the inner liner, considering the characteristics of products in the aerospace and defense industry, where the safety of the applied product is considered as a priority. High strength carbon fiber was applied to the outside. In order to evaluate the performance of the developed product, burst test and cycling test were carried out. In burst test, an excellent safety margin equivalent to 2.7 times the operating pressure was obtained. In cycling test, a stable failure mode in which 'pre-burst leak' occurs is proved and the soundness of the product is proved.

저속 회전 시 배기시스템의 배압이 정숙성에 미치는 영향 (Influence of Back Pressure of an Exhaust System on Quietness at Low-Speed Rotation)

  • 강일석;양성모
    • 한국기계가공학회지
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    • 제18권6호
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    • pp.69-75
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    • 2019
  • In recent years, the driving performance and exhaust sound quality in automobiles have been recognized as important factors, as they maximize the driving fun to fulfil the demands of customers. Therefore, many automobile manufacturers are studying various exhaust pipe shapes to improve sound quality and optimize exhaust pressure. The objective of the exhaust pipe design is to maximize the engine efficiency using optimal exhaust pressure settings. In this study, an exhaust system was fabricated with different junction shapes, and the results were analyzed through various experiments. The exhaust gas pressure acting inside the exhaust pipe was measured using a pressure transducer. Meanwhile, the vibration generated in the vehicle was measured in three axial directions and analyzed. The ground noise generated in the indoor and outdoor of the vehicle was measured, and the noise generated at the maximum output was measured and analyzed.

수소전기차용 700 bar 수소충전노즐의 노즐형상을 고려한 최적설계에 관한 연구 (Study on the Optimal Design of the Nozzle Shape of the 700 bar Hydrogen Refueling Nozzle for Hydrogen Electric Vehicles)

  • 백진욱;곽기명;김남용;조용민;류성기
    • 한국기계가공학회지
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    • 제21권7호
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    • pp.28-33
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    • 2022
  • In this study, we analyze the flow characteristics according to the internal shape of a 700bar hydrogen charging gun for hydrogen electric vehicles. When charging hydrogen, it receives a high-pressure charging pressure. At this time, we analyze the flow characteristics according to the shape of the nozzle and find the shape of the nozzle that minimizes energy loss. Ultimately, the optimal design of the nozzle was obtained by comparing the pressure difference between the inlet pressure and outlet pressure under a fixed mass flow condition.

압입축의 파손 저감을 위한 설계 방법에 대한 연구 (Design Method to Reduce the Press-Fitted Assembly Dama)

  • 변성광;최하영;이동형
    • 한국기계가공학회지
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    • 제20권5호
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    • pp.128-134
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    • 2021
  • A press-fitted shaft is an essential part used in industrial machines, and it is generally used to transmit large quantities of power. Very high contact pressure occurs at the end parts of the contact between the shaft and boss, which are press-fitted shaft components. Such contact pressure not only damages the contact surface of a press-fitted shaft but also reduces its fatigue strength. To improve a press-fitted shaft's fatigue strength, the contact pressure on the contact surface, which directly affects the fatigue strength, should be minimized. Thus, in this study, the design configuration optimization of the end part of the boss was based on the approximate optimization method and was aimed at minimizing the contact pressure at the end of a press-fitted shaft. Comparison of the contact pressure and the contact stress of a conventional press-fitted shaft with those of the optimized press-fitted shaft showed that the boss design of the optimized press-fitted shaft effectively improved the fatigue life.

해양플랜트용 고차압 제어밸브의 해석 및 설계 (CAE/CFD Analysis and Design of High-Pressure Drop Control Valve for Offshore Project)

  • 장성철;박태수;허남수;김인환
    • 한국기계가공학회지
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    • 제14권5호
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    • pp.42-49
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    • 2015
  • In this study, the multi-disk of a high-pressure drop control valve is designed and manufactured. Then, the flow rate and high-pressure drop of fluids flowing in the high-pressure drop control valve is CAE/CFD. This study involves numerical analysis for the Zambil offshore project of a high-pressure drop control valve. ANSYS used a solver for offshore structures analysis. A high-pressure drop control valve, which transforms the power transfer of a system by reducing the inlet pressure of 345bar to the outlet pressure of 112bar, is a fundamental component in the offshore process. This study not only analyzes the relation between pressure drop and fluid velocity in a trim by using fluid analysis, but also examines the possibility of cavitation in a valve in addition to the plot for the extension of lifespan. It is demonstrated that the pressure drop from 345bar to 112bar is more feasible in the presence of the trim, which can induce a continuous and diminutive pressure drop in order to prevent cavitation in a high-pressure drop control valve.

고압 분사노즐의 최적형상에 관한 연구 (A Study on the Optimum Shape of High-Pressure Injection Nozzle)

  • 이종선;김형철
    • 한국공작기계학회논문집
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    • 제12권2호
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    • pp.37-43
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    • 2003
  • This study makes to flow analysis of computational fluid dynamics(CFD) according to the basic theory of turbulent flow regarding high-pressure injection nozzle. It also makes structural analysis to find out the structural validity of the optimum shape of high-pressure injection nozzle. It divides to two areas such as plunger areas and high-pressure injection nozzle area including plunger.

고압 분사노즐의 구조해석 (Structural Analysis of High Pressure Injection Nozzle)

  • 원종진;이종선;윤희중;김형철
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 추계학술대회 논문집
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    • pp.69-74
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    • 2002
  • This study is object to structural analysis of high pressure injection nozzle. The finite element model was developed to compute the stress, strain for high pressure injection nozzle. For structural analysis using result from FEM code. This structural analysis results, many variables such as internal pressure, boundary condition, constraint condition and load condition are considered.

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사출/압축 공정과 인서트 오버몰딩을 이용한 탄소복합소재 성형에 대한 연구 (A study on carbon composite fabrication using injection/compression molding and insert-over molding)

  • 정의철;윤경환;홍석관;이상용;이성희
    • Design & Manufacturing
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    • 제14권4호
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    • pp.11-16
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    • 2020
  • In this study, forming of carbon composite parts was performed using an injection/compression molding process. An impregnation of matrix is determined by ability of wet and flow rate between the matrix and reinforcement. The flow rate of matrix passing through the reinforcements is a function of permeability of reinforcement, a viscosity of matrix and pressure gradient on molding, and the viscosity of the matrix depends on the mold temperature, molding pressure and shear strain of matrix. Therefore, compression molding experiment was conducted using a heating mold in order to confirm the possibility of matrix impregnation. The impregnation of the matrix through the porosities between the woven yarns was confirmed by the cross-sectional SEM image of compression molded parts. An injection molding process was also performed at a short cycle time, high molding pressure and low mold temperature than those of compression experiment conditions. Deterioration of impregnation on the surface of molded parts were caused by these injection conditions and it could be the reason of decreasing the maximum tensile strength. In order to improve impregnation of matrix on the surface, injection/compression molding and insert-over molding were applied. As a result of applying injection/compression molding and insert-over molding, it was shown that the improvement of impregnation on the surface and the maximum tensile strength was increased about 2.8 times than the virgin matrix.

Development of Manufacturing Method of Vessel for Keeping Warm by Hydraulic Bulging

  • Chung, Joon-Ki;Cho, Woong-Shick
    • International Journal of Precision Engineering and Manufacturing
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    • 제2권4호
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    • pp.40-46
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    • 2001
  • Bulging is a forming method to shape die cavity by using hydraulic pressure in tube or vessel. Bulging machine and die were developed in order to produce vessel for keeping warm. Bulging machine is a double type with two horizontal cylinders for bulging of two pieces at the same time. The developed die system has one bulging die and two drawing dies for necking at both ends of the tube. The diameter of tube expands by hydraulic pressure in tube. At the same time, thrust at both ends of the tube pushes tube in the direction of expansion to obtain high expansion rate with no crack. In this study, the bulging properties were investigated to solve tube crack and necking in manufacturing vessel by combining bulging and drawing. As a result, high expanding rate of tube radius without crack, precision necking and high productivity were obtained.

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Cu 박판에 대한 초음파 용착 조건 확립 (Establishment of Conditions for Ultrasonic Welding of Cu sheet)

  • 서정석;박동삼
    • 한국생산제조학회지
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    • 제19권2호
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    • pp.282-287
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    • 2010
  • This paper gives a description of an experimental study of the ultrasonic welding of metals. In ultrasonic metal welding, high frequency vibrations are combined with pressure to join two materials together quickly and securely, without producing significant amount of heat. Ultrasonic metal welder consists of Transducer, Booster, and horn that are designed very accurately to get the natural frequencies and vibration mode. In this study, The horn was designed and analyzed the natural frequency by the modal analysis and harmonic analysis. And using a fiber optic sensor, we measured the amplitude and analyzed the Fast Fourier Transformed result. Using the horn, Ultrasonic metal welding between Cu sheet and Cu sheet of 0.1mm thickness was accomplished under the optimal conditions of static pressure 0.15MPa, vibration amplitude 30% and welding time of 0.28s. This result can be used for ultrasonic metal welding in manufacturing industry.