• 제목/요약/키워드: Burr Formation Mechanism

검색결과 25건 처리시간 0.044초

Clay가공에 있어서 Burr 생성기구에 관한 연구 (A Study on the Bburr Formation Mechanism in Clay Machining)

  • 양균의;고성림
    • 한국정밀공학회지
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    • 제7권4호
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    • pp.73-84
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    • 1990
  • A burr has been defined as an undesirable projection of material formed as the result of plastic flow from a cutting or shearing operation. It is Unavoidable in all kinds of machining operation. This paper describe the burr formation mechanism which is based on the behavior of workpiece material during orthogonal machining of the clay on the milling machine. Specially in this report the rollover burr is dealt as a specific case of the chip formation in the final stage of cutting. The negative shear angle is introduced as an important features of burr formation. It is found that the burr formation process is divided into three stage-initiation, development of negative shearing, and formation of the burr with appropriate assumptions. Using above the burr formation mechanism, the size of burr can be estimated by cutting conditions.

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임의형상의 버 발생 메카니즘의 기하학적 해석 (Geometrical Analysis on the Formation Mechanism of Milling Burr on Arbitrary Feature)

  • 이제열;안용진;김영진
    • 한국CDE학회논문집
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    • 제6권4호
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    • pp.222-228
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    • 2001
  • In the milling operation, the burr can be generated on the intersection of cutting tool and workpiece. Due to burr formation, we expect lower efficiency in the operation and the cost increase. In order to understand the burr formation mechanism in the milling operation on the arbitrary feature, we developed an algorithm to analyse and predict the exit burr formation mechanism. Firstly, the recognition of arbitrary shaped workpiece was done through the CAD data. This data includes point information on the vertices of the workpiece. Secondly, tile CAM data regarding tool geometry, tool path, cutting speed, and material data are retrieved to simulate the actual cutting process. Thirdly, we predict the exit burr formation on the edge of workpiece based on the geometric analysis. Lastly, an algorithm implemented in the Windows environment to visualize the burr formation simulation. With this information, we can predict which portion of workpiece would have the exit burr in advance so that we call manage to find a way to minimize the edit burr formation in the actual cutting.

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페이스 밀링 가공시 출구버 형성에 관한 연구 (A Study on Exit Burr Formation in Face Milling)

  • 한상우;고성림
    • 한국정밀공학회지
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    • 제19권8호
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    • pp.55-62
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    • 2002
  • A burr has been defined as undesirable projection of material formed as the result of plastic flow from a cutting or shearing operation. It is unavoidable in all kinds of machining operation. As a result, burr makes troubles on manufacturing process due to deburring cost, quality of products and productivity. In face milling operation, burrs are formed along five edges on the workpiece. In this study, the primary interest is about exit burr The influence of the cutting parameters on the formation of exit burrs in face milling will be described experimentally. Using the results of experimental study, burr types are classified according to appearance and formation mechanism in exit burr. The burr formation mechanism in each type of burr is suggested. Data bases are developed to predict burr formation result.

드릴가공시 버 형성에 관한 연구 (Study on Mechanism of Burr Formation in Drilling)

  • 이징구;고성림;고대철
    • 한국정밀공학회지
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    • 제18권10호
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    • pp.200-207
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    • 2001
  • Burrs farmed in drilling are classified into three types, no burr, burrs with cap, teared burr. To control burr size in drilling, the second type burrs with cap are to be formed because it is small and uniform. It is necessary to understand the mechanism of cap formation to derive the burr formation into second type burr with cap. In several materials. second type burrs are formed in drilling by changing cutting conditions. It is observed that cap is formed as a result of the plastic deformation along the outside of exit hope. According to the tension behavior of the material in concentrated region between hole and drill outside edge, the geometry of burr with cap is determined. Simplified 2D FEM analysis shows good prediction for burr formation.

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밀링가공시 버 형성 예측을 위한 전문가 시스템 개발 (II) - 복잡한 형상의 피삭재와 다중경로에 의한 밀링가공시 (Development of Expert System for Burr Formation Prediction in Face Milling (II) - In Milling Multi Featured workpiece with Multi)

  • 고성림;김영진;장재은;이장범;김지환
    • 한국정밀공학회지
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    • 제20권12호
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    • pp.25-33
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    • 2003
  • A burr has been defined as undesirable projection of material formed as a result of plastic flow from a cutting or shearing operation. It is unavoidable in all kinds of machining operation. As a result, burr makes troubles on manufacturing process due to deburring cost, quality of products and productivity. In this study, the primary interest is about exit burr. The burr formation mechanism in each type of burr is classified. Data bases are developed to predict burr formation result. In the milling operation, we develop an algorithm to analyze the burr formation mechanism by the geometrical analysis on the multi featured workpiece with multi cutting path. The algorithm includes three steps, i. e., the feature identification, the cutting condition identification, and the analysis on exit burr formation. We can predict which portion of workpiece would have the exit burr in advance so that we can manage to find a way to minimize the exit burr formation in an actual cutting. Also, this algorithm can be implemented in a commercial CAM package so that we can simulate the NC code to review the burr formation in advance.

드릴가공시 버 형성에 관한 연구 (Study on Mechanism of Burr Formation in Drilling)

  • 이징구;고성림;고대철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.823-826
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    • 2000
  • Burr formed in drilling are classified into three types. no burr, burrs with cap, teared burr. To control burr size in drilling. the second type burrs with cap are to be formed because it is small and uniform. It is necessary to understand the mechanism of cap formation to derive the burr formation into second type burr with cap. In several materials, second type burrs are formed in drilling by changing cutting conditions. It is observed that cap is formed as a result of the plastic deformation along the outside of exit hole. According to the tension behavior of the material in concentrated region between hole and drill outside edge, the geometry of burr with cap is determined.

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유한요소법을 이용한 절삭가공 Burr 예측과 생성특성 연구 (Burr Prediction via Finite Element Method and Burr Formation Characteristics in Metal Cutting Process)

  • 황준;황덕철;우창기;양계준
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.1000-1003
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    • 2001
  • This paper presents the numerical analysis and experimental verification to know the metal cutting burr formation mechanism in face milling operation. Finite element method are applied to predict the 2-D burr formation process prediction. Face milling process are adjusted to analyze the characteristics of burr shapes according to various cutting conditions. The cutting parameters were investigated with cutting speed, feed rate, depth of cut. Through the experiments various burr types are classified according to its shape and properties.

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칩브레이커 사용에 따른 밀링버의 생성특성 연구 (Burr Formation Characteristics due to Chip Breaker in Milling Process)

  • 황덕철;황준;우창기
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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    • pp.78-82
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    • 2001
  • This paper presents the numerical analysis and experimental verification to know the metal cutting burr formation mechanism in face milling operation. Finite element method are applied to predict the 2-D burr formation process prediction. Face milling process are adjusted to analyze the characteristics of burr shapes according to various cutting conditions. The cutting parameters were investigated with cutting speed, feed rate, depth of cut. Through a few experiments, various burr types are classified according to its shape and properties.

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페이스 밀링 가공시 버형성에 관한 연구 (II) (A Study on Burr Formation in Face Milling(II))

  • 한상우;고성림
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.810-813
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    • 2000
  • Burr makes trobles on manufacturing process due to deburring cost, quality of products and productivity. This paper described the results of experimental study on the influence of the cutting parameters on the formation of exit burrs in face milling. The cutting parameters were investigated changing exit angle, rake nagle , lead angle in tool geometry as well as feed per tooth. Also we carried out experimets on several materials. Using the result of experimental study, burr types are classified according to appearance and formation mechanism in exit burr and we are considered the burr formation in each type of burr.

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드릴가공시 버 형성에 관한 등가 2차원 모델을 이용한 유한요소해석 (Finite Element Analysis using Equivalent 2D Model for Exit Burr formation in Drilling)

  • 이징구;고성림;고대철
    • 한국정밀공학회지
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    • 제20권5호
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    • pp.57-65
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    • 2003
  • The formation of exit burr in drilling metals is analyzed by finite element method. The simplified burr formation model is suggested for the complex mechanism of burr formation in drilling on the basis of experimental data. Using the model the magnitude of burr is predicted and the effect of material properties of workpiece and cutting condition on burr formation is analyzed in the present study. The suggested model is verified by comparing simulation results and experimental ones. The predicted size and shape of burr are in good agreement with those observed by experiment.