• 제목/요약/키워드: Barrel Type Equipment

검색결과 7건 처리시간 0.02초

회전식 바렐 장치에 의한 레올로지 소재의 연속 제조 공정 (Continuous Fabrication Process of Rheology Material by Rotational Barrel Equipment)

  • 서판기;정용식;강충길
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 추계학술대회논문집
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    • pp.103-106
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    • 2004
  • The new rheology fabrication process has been developed to rheo die casting and rheo forming process. Thixoforming process has disadvantages in terms of induction reheating process, scrap recycling, loss of raw material and cycle time. Therefore, to reduce the number of process, new rheology fabrication process with specially designed the rotational barrel type equipment has been proposed to apply in various part productions. The barrel type equipment, which could continuously fabricate the rheology materil, was specially designed to have a function to control cooling rate, shear rate and temperature. During the continuous rotation of barrel with a constant temperature, the shear rate is controlled with the rotation speed. The barrel surface has both the induction heating system and the cooling system to control the temperature of molten metal. By using this system, the effect of the rotation speed and the rotation time on the microstructure was widely examined. The possibility for the rheoforming process was investigated with microstructural characteristic.

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회전식 Barrel에 의한 레오로지 소재 제조장치 (Fabricating Apparatus of Rheological Material by Rotational Barrel)

  • 김태원;서판기;오세웅;강충길
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 추계학술대회 논문집
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    • pp.358-361
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    • 2005
  • The rotational barrel type equipment has been designed for the new rheology fabrication process. During the continuous rotation of barrel with a constant temperature, the shear rate is controlled with the rotation speed and rotation time of barrel. The barrel surface can be controlled the temperature by the induction heating and cooling system. Many experiments were widely examined by using this system with controlling the rotation speed and the rotation time. The possibility for the rheoforming process was investigated with microstructural characteristics.

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회전식 바렐에 의한 단조용 레오로지 소재 제조 (Fabricating Apparatus of Rheological Material for forging by Rotational Barrel)

  • 김태원;서판기;오세웅;강충길
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.645-648
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    • 2005
  • The rotational barrel type equipment has been designed for the new rheology fabrication process. During the continuous rotation of barrel with a constant temperature, the shear rate is controlled with the rotation speed and rotation time of barrel. The barrel surface can be controlled the temperature by the induction heating and cooling system. Many experiments were widely examined by using this system with controlling the rotation speed and the rotation time. The possibility for the rheoforming process was investigated with microstructural characteristics.

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기계적 필터를 이용한 포신형상 구조물의 진동신호 측정 (Measurement of Vibration Signals of a Gun Barrel Type Structure using Mechanical Filter)

  • 류봉조;구경완
    • 전기학회논문지P
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    • 제59권4호
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    • pp.440-443
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    • 2010
  • This paper deals with the method of vibration measurement of a gun barrel structure using mechanical filter. When a bullet with high speed is moving within a gun barrel type structure with low bending vibration frequencies, it is difficult to measure the bending vibration signals of the structure. For example, noncontact type sensors such as displacement or velocity sensor are not appropriate for the measurement of vibrational signals because of the movement effect of the equipment frame through the moving structures or effect of the ground vibration. One of contact type sensors such as accelerometer is profitable for measurement of vibrational signals because of its wide measurement ranges. In the case of a gun barrel structure including high vibrational signals like shock waves, however, it is necessary to propose vibration measurement method filtering high frequencies. The purpose of the paper is to propose the proper vibrational measurement technique filtering high frequencies of a gun barrel type structure.

기계적 필터를 이용한 포신형상 구조물의 진동신호 측정 (Measurement of Vibration Signals of a Gun Barrel Type Structure using Mechanical Filter)

  • 류봉조;이규섭;신광복;오부진
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 춘계학술대회논문집
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    • pp.181-184
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    • 2007
  • This paper deals with the method of vibration measurement of a gun barrel structure using mechanical filter. When a bullet with high speed is moving within a gun barrel type structure with low bending vibration frequencies, it is difficult to measure the bending vibration signals of the structure. For example, noncontact type sensors such as displacement or velocity sensor are not appropriate for the measurement of vibrational signals because of the movement effect of the equipment frame through the moving structures or effect of the ground vibration. One of contact type sensors such as accelerometer is profitable for measurement of vibrational signals because of its wide measurement ranges. In the case of a gun barrel structure including high vibrational signals like shock waves, however, it is necessary to propose vibration measurement method filtering high frequencies. The purpose of the paper is to propose the proper vibrational measurement technique filtering high frequencies of a gun barrel type structure.

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사축식 유압 피스톤 펌프의 저속 마찰 특성 개선 (Improvement of the Low-speed Friction Characteristics of a Bent-Axis Type Hydraulic Piston Pump)

  • 홍예선;이상율;김치붕;김성훈;임현식;김성대
    • 유공압시스템학회논문집
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    • 제1권3호
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    • pp.7-13
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    • 2004
  • The hydraulic pump for a Electro-hydrostatic Actuator for aircrafts should be able to quickly feed large volume of oil into hydraulic cylinder in order to reduce the response time. On the other hand, it should be also able to precisely dispense small amount of oil by low-speed operation so that the steady state position control error of the EHA can be accurately compensated. This paper is focused on the investigation how the plasma coating surface treatment of cylinder barrel with CrSiN can contribute to the reduction of low-speed friction torque of a bent-axis type piston pump. The results showed that the reduction of the friction torque was not remarkable, but that the anti-wear characteristics of the CrSiN-coated cylinder barrel were much better that those of the original one.

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농업기계 임대사업 운영실태 및 개선방안 (Operation status of Agricultural Machinery Rental Service and its Improvement Plan)

  • 신승엽;이정민;김유용;노재승
    • 농촌계획
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    • 제22권4호
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    • pp.61-69
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    • 2016
  • In order to reduce the farmers' burden of purchasing agricultural machinery and address the shortage of farm workers, the government have been promoting agricultural machinery rental service since 2003. Despite of political purpose, the outcome of agricultural machinery rental service turned out to be adverse, high cost and low efficiency, by the pork barrel projects operated from some municipalities. Therefore, this study was aimed to improve the efficiency of agricultural machinery rental service by analyzing the operation status of agricultural machinery in local government. A questionnaire survey was conducted at 134 cities and counties in terms of rent type, management personnel, business budget, agricultural machinery ownership, rental performance, use rates, operational problems, and improvement plan. This study found that some agricultural machinery rental offices were only focused on the short-term rental service, which caused the increasing number of operating personnel, required facilities/equipment. The short-term rental service has a limitation for promoting the mechanization rate in dry-field farming. Therefore, it should be carried out along with the long-term rental service which a lessee maintains and manages agricultural machinery directly. Furthermore, the reasonable number of agricultural machinery based on regional circumstances should be considered to meet rental demand and collect the minimal rental fee for purchasing new agricultural machinery and replacing old ones.