• 제목/요약/키워드: Flow Control Forming

검색결과 105건 처리시간 0.07초

자동차용 허브 클러치의 유동제어에 관한 실험적 연구 (Experimental Investigation on the Flow Control of Hub Clutch for Automobile)

  • 박종남;김동환;김병민
    • 소성∙가공
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    • 제11권5호
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    • pp.430-438
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    • 2002
  • This paper suggests the new technology to control metal flow in orther to change of the cold forging from conventional deep drawing forming. This technology can be summarized the complex forming, which consists of bulk forming and sheet forming, and multi-action forging, which be performed double action press. The proposed technology is applied to hub clutch model which is part of auto-transmission for automobile. The purpose of this study is to investigate the material flow behavior of hub clutch through control the relative velocity ratio and the stroke of mandrel and punch using the flow forming technique. First of all, the finite element simulations are applied to analyse optimal process conditions to prevent flow defect(necking defect etc.) from non-uniform metal flow, then the results are compared with the plasticine model material experiments. The punch load for real material is predict from similarity law. Finally, the model material experiment results are in good agreement with the FE simulation ones.

유동제어 성형기술을 이용한 허브제품의 냉간단조 공정설계 (Process Design of Cold Forged Hub by Flow Control Forming Technique)

  • 박종남;김동환;김병민
    • 한국정밀공학회지
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    • 제19권6호
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    • pp.86-95
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    • 2002
  • This paper suggests the new technology to control metal flow in order to reduce the number of preforming and the machining for the cold forged product with complex geometry. This technology is the combined forming that consists of bulk and sheet forming with double action dies. To analyze the process, finite element simulation has been performed. The proposed technology is applied to hub model that is part of air conditioner clutch. The purpose of this study is to investigate the material now of hub through the relative-velocity control of punch and mandrel using the flow control forming technique.

유동제어 성형기술을 이용한 자동차 허브클러치의 실험적 연구 (A Experimental Study of Automobile Hub Clutch used Flow Control Forming Techniques)

  • 박종남;계중읍;김병민
    • 한국정밀공학회지
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    • 제19권12호
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    • pp.142-149
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    • 2002
  • In this paper, the metal forming process is caused of rise of the unit cost of production in increase of the lead-time and cost because of manufacturing final product through a few the number of processes. Flow control complex forming is proposed to put into formulation in order to apply cold forging from conventional approximate similarity theory, and the forming loads of the real material(AISI 1008) can be calculated by put at the new similarity formula the load by plasticine model material experiment through hub clutch. In order to reduce lead-time and cost the technology is used to manufacture with lower die of this product. By the application synthetic resin as the raw material, it is have the merit such short lead-time, low cost, good surface finish etc., as compared with the machine work.

자동변속기용 드럼클러치의 유동제어 성형공정 및 실험장치 개발 연구 (A Study on the Flow Control Forming Process and Experiment Device of Drum Clutch for Automatic Transmission)

  • 박종남
    • 한국기계가공학회지
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    • 제12권6호
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    • pp.69-76
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    • 2013
  • This paper presents the development of the FCF method for the manufacturing of final products using numbers related to the minimum amount of work. The utilized product is a drum clutch, which is part of the transmission of an automobile. A double acting press is secured first and a prediction of the forming load on the practical material is made through an experiment with a plasticine model. Also, a finite element simulation using product shape and properties is performed, as well as a press experiment. A double acting press is manufactured that is suitable for a double acting experiment with a conventional hydraulic press(200 tons). A peripheral device for the press is additionally designed for experimental purposes. And, the press has as its essential points the drive speed, stroke control, etc., all of which influence the forming and is modified. Especially, a laser system is used for velocity measurement of two punches. The forming load of a practical material is predicted in order to derive a forming load formula for cold conditions on the basis of approximate similarity theory. Finite element analysis of the relative velocity ratio(RVR), etc., for most suitable flow defect(unfilling, etc.) prevention is achieved as well. The results are verified through a press experiment.

유동제어를 통한 자동차 부품의 복합 성형기술 (The Technology of Complex Forming for Automobile Part with Flow Control)

  • 이동주;김동진;김병민
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 단조 심포지엄
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    • pp.185-194
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    • 1999
  • This paper suggests the new techmology to control metal flow in order to reduce the number of preforming and machining for the cold forged product with complex geometry. This technology can be summarized the complex forming, which consists of bulk forming and sheet forming, and multi-action forging, which be preformed double action dies. To analyze the process, finite element simulation has been performed. The proposed technology is applied to hub which is part of air conditioner clutch. According to the result of this study, the relative velocity of mandrel and punch is primary process variable.

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유동제어에 의한 피스톤 핀의 전${\cdot}$후방압출 공정 개발 (Forward-Backward Extrusion Process Development of Piston-Pin by Flow Control)

  • 박종남;박태준;김병민
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2001년도 제4회 압출 및 인발가공 심포지엄
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    • pp.1-12
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    • 2001
  • In cold forging of piston-pin for automobile parts, the flow defect appears by the dead metal zone. This appearance evidently happens in products with a thin piercing thickness for the dimension accuracy and the decrease of material loss. The best method that can prevent flow defect is removing dead metal zone. The purpose of this study is to investigate the material flow behavior of forward-backward extruded piston-pin through the relative velocity ratio and the stroke control of upper moving punch & container using the flow control forming technique. The finite element simulations are applied to analyse the flow defect, then the results are compared with the plasticine model material experiments. Finally, the model experiment results are in good agreement with the FE simulation ones.

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자동차용 피스톤 핀의 전.후방압출에서 유동제어에 관한 실험적 연구 (Experimental Investigation on the Flow Control in Forward-Backward Extrusion of Piston-Pin for Automobile)

  • 박종남;박태준;김동환;김병민
    • 대한기계학회논문집A
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    • 제26권7호
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    • pp.1366-1375
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    • 2002
  • In cold forging of piston-pin for automobile parts, the flow defect appears by the dead metal zone. This appearance evidently happens in products with a thin piercing thickness for the dimension accuracy and the decrease of material loss. The best method that can prevent flow defect is removing dead metal zone. The purpose of this study is to investigate the material flow behavior of forward-backward extruded piston-pin through the relative velocity ratio and the stroke control of upper moving punch & container using the flow control forming technique. The finite element simulations are applied to analyse the flow defect, then the results are compared with the plasticine model material experiments. The model experiment results are in good agreement with the FE simulation ones.

박격포 포신 제작을 위한 Inconel718 소재의 전진 유동성형 조건 선정에 관한 연구 (A Study on the Selection of Forward Flow Forming Conditions with Inconel718 Tube for Mortar Barrel Manufacturing)

  • 고세권;조영태
    • 한국기계가공학회지
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    • 제18권8호
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    • pp.51-59
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    • 2019
  • Flow forming is an eco-friendly and high-efficiency plastic deformation process with fewer chips during a process which is specifically used to manufacture seamless tubular products like tire wheels, rocket motor cases etc. On the development of mortar barrel using Inconel718 tube, some flow formed products had dimensional errors on their thickness. In this study, our purpose is to optimize the process conditions with the smallest dimensional error. In order to find an optimum process condition, 2D axisymmetric FEM simulation analyses with Taguchi method were conducted. Geometric variables (attack angle, flatting angle, roller nose radius) and operating parameters (depth of forming, feed rate) are considered as control factors. Forward flow forming with single roller was first analyzed to determine the effective factors using AFDEX software and attack angle of the roller was identified as the most influential factor. Also, the nose radius of the rollers was confirmed as a significant factor in multi-rollers flow forming system. The effect of rollers offset values are also studied and finally, we proposed optimal conditions to improve the accuracy of flow forming process with Inconel718 tube for mortar barrel manufacturing.

업셋 단조의 좌굴 및 소성 불안정 유동에 관한 연구 (A Study on the Buckling and Plastic Instable Flow in Upset Forging)

  • 김완수;이병섭;황두순;홍성인
    • 소성∙가공
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    • 제8권4호
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    • pp.393-398
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    • 1999
  • The plastic instable flow phenomenon happens in practical forming process, I. e. upsetting, backward extrusion, piercing, indentation. And also, it is difficult to control precisely the shape and dimensions of forming process. It is found that instabilities of the process are mainly connected with imperfections in the lubrication, billet eccentricity, inclined punch alignment. In view of the direct relationship between instable material flow and quality defects of the products and for better control of forming operation, we should necessarily find out their phenomena. In this study, we introduced the friction disturbance due to inclined punch angle. Analysis of upset forging is carried out using the rigid plastic FEM and slab method with eccentricity. Also, we considered the buckling parameters of billet with the large aspect ratio in upset forging.

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