• 제목/요약/키워드: Shaped Drawing Process

검색결과 56건 처리시간 0.021초

비정상상태 이형재 인발공정의 3차원 강소성 유한요소해석 (Three-Dimensional Rigid-Plastic Finite Element Analysis of Nonsteady State Shaped Drawing Process)

  • 김호창;최영;김병민
    • 한국정밀공학회지
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    • 제15권7호
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    • pp.119-128
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    • 1998
  • In this paper, nonsteady state shaped drawing process has been investigated using the three-dimensional rigid-plastic finite element method. In order to analyze the shaped drawing process, a method to define straight converging die considering straight die part, die radius part and bearing part has been proposed. In addition, the modeling of initial billet and the generation procedure of mesh system have been suggested. The three-dimensional rigid-plastic finite element simulation has been performed for a square sectional drawing process and its result has been confirmed in comparison with the existing experimental one. Also, for the same process conditions, the effect of perimeter ratio in the shaped drawing process has been investigated.

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원형봉에서 사각재 인발 공정의 코너 채움에 관한 연구 (A Study on the Corner Filling in the Drawing of Quadrangle Rod from Round Bar)

  • 김용철;김동진;김병민
    • 한국정밀공학회지
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    • 제17권6호
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    • pp.143-152
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    • 2000
  • The comer filling in shaped drawing process is an important characteristic, unlike the round drawing. It has also influence on the dimensional accuracy of the product. In this study, therefore, the shaped drawing process has been simulated by the three dimensional rigid-plastic finite element method in order to investigate the effect of process variables such as reduction in area and semi-die angle to the corner filling. The artificial neural network has also been introduced to reduce the number of simulations. To verify the results of simulations, experiments have been performed on the real industrial products. According to the results, the main process variable on the corner filling is the combination of semi-die angle in the irregular shaped drawing processes, but in the case of regular shaped drawing processes, reduction in area has great influence on the corner filling.

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강소성 유한요소법과 신경망을 이용한 직사각재 인발공정에 관한 연구 (A Studyon the Drawing of Rectangular Rod from Round Bar by using Rigid Plastic FEM and Neural Network)

  • 김용철;최영;김병민;최재찬
    • 소성∙가공
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    • 제8권4호
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    • pp.331-339
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    • 1999
  • In this study, to analyze the shaped drawing process from round bar, the practical conical die with considering die radius and bearing was defined by a mathematical expression, and also a simple technique for initial mesh generation to the shaped drawing process was proposed. The drawing of rectangular section from round bar, one of the shaped drawing process, has been simulated by using non-steady state 3D rigid plastic finite element method in order to evaluate the influence of semi-die angle and reduction in area to corner filling. Other process variables such as friction constant, rectangular ratio, die radius and bearing length were fixed during the simulation. An artificial neural network has been introduced to obtain the optimal process conditions which gave rise to a fast simulation.

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타원형상 디프 드로잉 제품의 공정설계 (A Process Design for Dlliptically Shaped Deep Drawing Products)

  • 배원락
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 추계학술대회논문집
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    • pp.26-29
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    • 1999
  • Process design for elliptically shaped deep drawing products is various according to size shape and specification of products. This study presents two approaches to design the preform that is a key process for elliptically shaped products, One of these is that cross-section of punch is circular. Another is that for the improvement of characteristics for final products the cross-section of the punch is similar to rectangular shape. After forming the preform process design of top-part drawing is the same. In the study blank shape and dimension are obtained by applying a numerical formula and surface area constancy.

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스플라인 이형인발을 위한 중간 다이 단면형상 설계 (Design of the Cross Sectional Shape of Intermediate Die for Shaped Drawing of Spline)

  • 이재은;이태규;이상곤;김병민
    • 소성∙가공
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    • 제17권8호
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    • pp.627-632
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    • 2008
  • The cross sectional shape of intermediate die is one of important parameters to improve dimensional accuracy of final product in shaped drawing process. Until now, it has been designed by the experience or trial and error of the expert. In this study, the cross sectional shape of intermediate die for spline shape is determined by the electric fields analysis and scale factor method. The result of the electric fields analysis and scale factor method have been compared with that of the expert method. The effects of cross sectional shape on the dimensional accuracy were investigated by using FE-simulation. And then the multi-stage shaped drawing experiments were performed to verify the results of FE-simulation. As a result, the cross sectional shape from the electric fields analysis and scale factor method had the good dimensional accuracy. These two methods can be used for the method to obtain the cross sectional shape of intermediate die in shaped drawing process.

유한요소해석 및 다구찌법을 이용한 형상인발제품 치수정도 및 진직도 향상을 위한 다이스각 최적화 (Optimization of Dies Angles to Improve the Dimensional Accuracy and Straightness of the Shaped Drawn Product based on the FE Simulation and the Taguchi Method)

  • 이상곤;이재은;김병민
    • 대한기계학회논문집A
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    • 제32권6호
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    • pp.474-480
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    • 2008
  • Recently, rods having irregular sections more complex than a rectangle or ellipse are necessary to produce mechanical parts. The cold shaped drawing process is used to obtain shaped drawn products with high levels of dimensional accuracy and quality. A cross roller guide, considered in this study, is one of the parts produced by shaped drawing process. A cross roller guide has a linear bearing system that rolls along a guide way. A cross roller guide is one of the most important components in terms of equipment because the quality of the product influences the precision linear motion. Therefore, the final dimensional accuracy of the linear rail in the shaped drawing is very important. The objective of this study is to find the optimized die angles to improve the dimensional accuracy and straightness of the final shaped drawn product. In order to achieve the aim of this study, design of experiment, FE-simulation, and the Taguchi method were used. Based on the analytical results, shaped drawing experiment has been performed to verify the result.

스플라인형상 인발을 위한 중간패스 단면형상 설계 (Design of Intermediate Die for Spline Drawing)

  • 이태규;이재은;이상곤;김병민
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 추계학술대회 논문집
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    • pp.337-340
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    • 2008
  • The cross section shape of intermediate die is one of important parameters to obtain dimensional accuracy of final product in shaped drawing process. Until now it has been designed by the experience or trial and error of the expert. In this study, the cross section shape of intermediate die fur spline shape is determined by the electronic field analysis, shape factor method. The result of the electronic field analysis, shape factor method has been compared with that of the present method. The effects of cross section shape on the dimensional accuracy were investigated by using FE analysis. And then the multi-stage shaped drawing experiments were performed to verify the results of FE analysis. As a result, the cross section shape from the electronic field analysis had the good dimensional accuracy. The electronic field analysis can be used for the method to obtain the cross section shape of intermediate die in shaped drawing process.

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인발가공에 있어서 마찰수식모델에 관한 연구 (A Study on the Numerical Friction Model in the Drawing)

  • 오박균
    • 한국산학기술학회논문지
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    • 제5권3호
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    • pp.260-265
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    • 2004
  • In order to analyze the shaped drawing process, it is necessary that the friction boundary condition between dies and blanks should be worked out the accurate numerical friction models. But, the existing numerical models of the drawing may be large different from the actual conditions. In this paper, accurate analysis of the drawing process should be subjected. It is to develop accuracy of the numerical friction models and potentialize to apply for the high speed forming work in the drawing process. Therefore, the results should improve the accuracy, cause the energy saving for the drawing process and finally expand the applying areas of the results.

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사각재 인발 공정의 코너채움에 관한 연구 (A Study on the Corner Filling in the Drawing of the Rectangular Rod)

  • 김용철;김영식;김병민
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 압출 및 인발 심포지엄
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    • pp.56-59
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    • 1999
  • In the present study, in order to investigate the effect of the corner filling in the drawing of the rectangular rod from a round bar, the drawing of the square rod from a round bar has been simulated by using rigid-plastic finite element method and artificial neural network has been introduced to reduce the number of simulation. The experimental investigation has been also implemented to verify the efficiency of the application of results of present and previous study. According to the results of present and pervious study, the combination of semi-die angle gives a great effect on the corner filling in case of the irregular shaped drawing process, but, in case of the regular shaped drawing process, the main process variable on the corner filling is reduction in area.

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사각재 인발 공정에서 코너 채움에 관한 유한 요소 해석 및 실험 (Finite Element Simulation and Experimental Investigation on the Corner Filling in the Drawing of Quadrangle Rod from a Round Bar)

  • 김용철
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 춘계학술대회논문집
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    • pp.99-102
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    • 1999
  • In this study, to investigate the effect of process variables such as reduction in area, semi-die angle and the rectangular ratio to the corner filling which influences the dimensional accuracy of the final product in the drawing of the cluadrangle rod from a round bar, it has been simulated by three dimensional rigid-plastic finite element method. In order to reduce the number of simulation artificial neural network has been introduced. Also, through the experimental investigation, the present results have been implemented on the industrial product. In results, the main process variable is the combination of the semi-die angle in case of the irregular shaped drawing process and reduction in area in the event of regular shaped drawing process, respectively.

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