• 제목/요약/키워드: Direct cutting test

검색결과 19건 처리시간 0.034초

공작기계 의 동적 성능 시험 및 평가 에 관한 연구 (I) (A S tudy on the Dynamic Performance Tests of Machine Tools(I))

  • 이장무
    • 대한기계학회논문집
    • /
    • 제9권2호
    • /
    • pp.190-201
    • /
    • 1985
  • 본 논문에서는 측정된 공작기계의 동적성능은 절삭조건과 공작기계의 동적 컴 플라이언스의 복합적인 함수이므로 공작기계의 동적 성능을 정확히 평가하고 설계.개 선을 용이하게 하기 위하여는 직접절삭시험 중 가진 시험을 동시에 수행하는 방법이 필요하다. 본 연구에서는 선반의 외경 선삭가공중의 동적성능을 직접절삭시험과 가 진 직접절삭법을 통하여 평가하고자 한다.

DBB를 이용한 5축 복합가공기의 오차 측정 시스템 개발에 관한 연구 (The Development of An Error Measurement System of 5-Axis Mill & Turn Machine Tool by Double Ball Bar Test)

  • 김태한;정윤교;고해주
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2006년도 춘계학술대회 논문집
    • /
    • pp.243-244
    • /
    • 2006
  • In this paper, the development of an error measurement system of 5-axis mill & turn machine tool presented by double ball bar test, which has been widely used to measure the overall accuracy of machining center. and the reliability of an error measurement system of 5-axis mill & turn machine tool was secured by the direct cutting test.

  • PDF

컴퓨터 비젼에 의한 공구마모의 자동계측 (The Automated Measurement of Tool Wear using Computer Vision)

  • 송준엽;이재종;박화영
    • 한국기계연구소 소보
    • /
    • 통권19호
    • /
    • pp.69-79
    • /
    • 1989
  • Cutting tool life monitoring is a critical element needed for designing unmanned machining systems. This paper describes a tool wear measurement system using computer vision which repeatedly measures flank and crater wear of a single point cutting tool. This direct tool wear measurement method is based on an interactive procedure utilizing a image processor and multi-vision sensors. A measurement software calcultes 7 parameters to characterize flank and crater wear. Performance test revealed that the computer vision technique provides precise, absolute tool-wear quantification and reduces human maesurement errors.

  • PDF

공구 여유각 변화가 선삭가공의 채터 진동에 미치는 영향에 관한 연구 (An experimental Study on the Effect of Relief Angles on the Chatter Vibration in Turing)

  • 최영휴
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
    • /
    • pp.685-690
    • /
    • 2000
  • In this study relationship between relief angles and chatter vibration in turning was examined by using the direct cutting test, in which the cutting depth of a tapered workpiece is varied continuously and the limiting depth of cut is measured at the time when chatter occurs. Test results reveal that 1) limiting depth of cut increases is proportion to side relief angles between 0$^{\circ}$ and 3$^{\circ}$, 2) limiting depth of cut does not show any evident change in spite of side relief angle increased from 3$^{\circ}$ to 12$^{\circ}$, 3) also limiting depth of cut does not change despite front angle change from 0$^{\circ}$ to 12$^{\circ}$.

  • PDF

Quatrz 웨이퍼의 직접접합과 극초단 레이저 가공을 이용한 체내 이식형 혈압센서 개발 (Development of Implantable Blood Pressure Sensor Using Quartz Wafer Direct Bonding and Ultrafast Laser Cutting)

  • 김성일;김응보;소상균;최지연;정연호
    • 대한의용생체공학회:의공학회지
    • /
    • 제37권5호
    • /
    • pp.168-177
    • /
    • 2016
  • In this paper we present an implantable pressure sensor to measure real-time blood pressure by monitoring mechanical movement of artery. Sensor is composed of inductors (L) and capacitors (C) which are formed by microfabrication and direct bonding on two biocompatible substrates (quartz). When electrical potential is applied to the sensor, the inductors and capacitors generates a LC resonance circuit and produce characteristic resonant frequencies. Real-time variation of the resonant frequency is monitored by an external measurement system using inductive coupling. Structural and electrical simulation was performed by Computer Aided Engineering (CAE) programs, ANSYS and HFSS, to optimize geometry of sensor. Ultrafast laser (femto-second) cutting and MEMS process were executed as sensor fabrication methods with consideration of brittleness of the substrate and small radial artery size. After whole fabrication processes, we got sensors of $3mm{\times}15mm{\times}0.5mm$. Resonant frequency of the sensor was around 90 MHz at atmosphere (760 mmHg), and the sensor has good linearity without any hysteresis. Longterm (5 years) stability of the sensor was verified by thermal acceleration testing with Arrhenius model. Moreover, in-vitro cytotoxicity test was done to show biocompatiblity of the sensor and validation of real-time blood pressure measurement was verified with animal test by implant of the sensor. By integration with development of external interrogation system, the proposed sensor system will be a promising method to measure real-time blood pressure.

구조체 콘크리트에 접합분리 시험체의 적용을 위한 강도비교에 관한 실험적 연구 (Studies on the Evaluation Method of Strength Comparison for Application in Joint Separation Test Body to Structural Concrete)

  • 김성덕;이선호;정광식;백민수;이영도;정상진
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2008년도 춘계 학술논문 발표대회
    • /
    • pp.79-82
    • /
    • 2008
  • It has been reported that destruction test by core collection is the most reliable of the structural concrete strength in present building construction field. But it causes low efficiency by damage and cutting in structure due to the core collection. It also has some problems in repairing. Additionally in case of strength test with management specimen, different environment compared to the structure environment cause problems about estimation precise structure strength. Therefore, it is required to develop structure direct strength test that has test values and credibility above the ones obtained by core specimen collection strength test and seasonal specimen test to suggest a reasonable and practical management method of structural concrete.

  • PDF

대형직접전단시험에 의한 뿌리말뚝의 거동 및 보강효과 (Reinforcing Effect and Behaviors of Root-Pile in Heavy-Duty Direct Shear Test)

  • 한중근;장신남
    • 한국환경복원기술학회지
    • /
    • 제5권3호
    • /
    • pp.23-30
    • /
    • 2002
  • In recently, using of steel reinforcements by reinforcing materials of the reinforced earth, micro-pile and root-pile etc,. is wide-spreading in the stabilizing control of cutting and embankment slopes, but the failure mechanism of reinforced earth as well as the effect of insert angles or types of reinforcement and others are not defined clearly. In this study, therefore heavy-duty direct shear tests were exercised on the reinforced soil and the non-reinforced soil, which was executed for research on the interaction of soil-reinforcement and theirs behavior. The hardness and softness and the standard sands were used for modeling of reinforced soil, the material constants for the computer simulation were estimated from the results of CD-Test. The effects of reinforcing and of friction increasing on the softness, area ratio of reinforcements is equal, were the better than them of the hardness, as well the reinforcing effects of shear strength without regard to the area ratio is much the same at $10^{\circ}$, insert angle of reinforced bar, differ from them of the existing study. Then, the results of numerical analysis showed that the behavior of reinforcements displayed bending resistance and shear resistance at $15^{\circ}$ and $30^{\circ}$, respectively. Also, the state of strain transfer was observed and the behavior of resistance mechanism on reinforcements presented almost the same them of landslides stabilizing pile.

접합분리 시험체를 사용한 구조체 콘크리트 강도 평가에 관한 실험적 연구 (Studies on the evaluation method of structural concrete strength using joint separation test body)

  • 김성덕;이선호;김광기;정광식;임남기;정상진
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
    • /
    • pp.993-996
    • /
    • 2008
  • 현재 건설현장에서 구조체 콘크리트 강도는 구조체에서 채취한 코어공시체 강도가 가장 신뢰성이 높다고 알려져 있다. 그러나 코어 채취시 구조체의 손상이나 배근의 절단에 의해서 구조체 성능의 지장을 줄 우려가 있고 공시체 채취후의 보수 등에 몇 가지 문제가 있다. 또한 비파괴 검사에 의한 경우 결과값을 추정하는 방법이기 때문에 신뢰도가 매우 저하되는 단점을 가지고 있다. 본 연구 개발의 목표는 접합 분리 시험체 및 콘크리트의 코어채취에 의한 직접적인 강도 측정방법과 계절별 관리용 공시체 강도를 비교분석하여 보다 발전된 구조체 콘크리트의 성능 평가방법을 제시하여 합리적이고 실용적인 구조체 콘크리트의 시공 품질관리 기법을 제안 하는데 목적이 있다.

  • PDF

풍화된 변성암 사면의 안정대책 사례 (Case of slope stability in weathered metamorphic rock)

  • 김재홍;박철숙;전제성;홍원표
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
    • /
    • pp.1400-1405
    • /
    • 2008
  • Execute surface of the earth geological survey for stability analysis of stealing cutting sides and investigated wide area nature of soil structure. Inflected DIPS that measure discontinuity's direction that develop to slope and is slope stability a wide use program for Stereographic Projection Method analysis that utilize geometrical correlation of stealing four sides and discontinuity surface. It is principle that angle of internal friction that is basis element of stability estimation applies direct shear test result on joint side, Examination is impossible by case execution, suppose by 30 angles that apply more conservatively in base rock slope sides usually and achieved analysis. When analyze, consider discontinuity's various adult that develop in research slope, after conduct first each discontinuity different assay falling into fault, joint, executed stability estimation which synthesize whole discontinuity data. When ailment element is recognized as analysis result, wished to present stability countermeasure way of most suitable to take into account of execution, stability, economic performance.

  • PDF

R/P 마스터 모델을 활용한 정밀주조 부품 및 쾌속금형 제작 공정기술의 개발 (Development of Rapid Tooling using Investment Casting & R/P Master Model)

  • 정해도;김화영
    • 한국주조공학회지
    • /
    • 제20권5호
    • /
    • pp.330-335
    • /
    • 2000
  • Functional metal prototypes are often required in numerous industrial applications. These components are typically needed in the early stage of a project to determine form, fit and function. Recent R/P(Rapid Prototyping) part are made of soft materials such as plastics, wax, paper, these master models cannot be employed durable test in real harsh working environment. Parts by direct metal rapid tooling method, such as laser sintering, by now are hard to get net shape, pores of the green parts of powder casting method must be infiltrated to get proper strength as tool, and new type of 3D direct tooling system combining fabrication welding arc and cutting process is reported. But a system which can build directly 3D parts of high performance functional material as metal park would get long period of system development, massive investment and other serious obstacles, such as patent. In this paper, through the rapid tooling process as silicon rubber molding using R/P master model, and fabricate wax pattern in that silicon rubber mold using vacuum casting method, then we translated the wax patterns to numerous metal tool prototypes by new investment casting process combined conventional investment casting with rapid prototyping & rapid tooling process. With this wax-injection-mold-free investment casting, we developed new investment casting process of fabricating numerous functional metal prototypes from one master model, combined 3-D CAD, R/P and conventional investment casting and tried to expect net shape measuring total dimension shrinkage from R/P pare to metal part.

  • PDF