• Title, Summary, Keyword: ferrule

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A Study on the Chucking of Ferrule using Cone-type Centers and Ball-type Centers in Co-Axial Grinding - Chucking Error Analysis (원추형 센터와 볼형 센터를 이용한 페룰 동축 연삭시 척킹에 관한 연구-척킹 오차 해석)

  • 김동길;박성준;김영태;이상조
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.40-49
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    • 2003
  • Ferrule is widely used as fiber optic connecters. In fiber-optic communications. the shape accuracy such as coaxiality and cylindricity of ferrule affects insertion loss. When coaxial grinding of ferrule supported by two pin. pin alignment and chucking accuracy are very important. In this research, the kinematic behavior of the ferrule centers are investigated in the case where the ferrule is chucked with the cone-shaped center pins and bail centers, With homogeneous coordinate transformation and numerical analysis, the obtained results are as follows: In the case of cone-type center, the alignment errors between center pins alone do not affect the rotation accuracy of ferrule. The alignment errors between center holes cause sinusoidal displacement of ferrule. And the maximum displacement of ferrule centers is proportional to the center pin angle. In the case of ball-type center, the displacements of ferrule centers has similar pattern as cone-type center, and the alignment errors art proportional to ball diameters.

A study on the chucking alignment error analysis in coaxial grinding of ferrule (페룰 동축연삭시 척킹 오차 해석)

  • 김동길;김영태;이상조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.9-14
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    • 2002
  • Ferrule is widely used as fiber optic connecters. In fiber-optic communications, the shape accuracy such as coaxiality and cylindricity of ferrule affects insertion loss. When coaxial grinding of ferrule supported by two pin, pin alignment and chucking accuracy are very important. In this research, the kinematic behavior of the ferrule center is investigated in the case where cone-shaped center pins and round circle hales which make contact with each other near the edge of the holes, using homeogenous coordinate transformation and numerical analysis. The obtained results are as follows: The alignment errors between center pins alone do not affect the rotation accuracy of ferrule. The alignment errors between center holes cause a sinusoidal displacement of ferrule. And the maximum displacement of ferrule centers increase in proportion to the center pin angle in the case of a fixed alignment errors

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Improvement of corrosion resistance and hardening the back ferrule surface by plasma treatment (Back ferrule 의 내식성과 체결시 기계적특성을 만족시키는 최적의 플라즈마 침질탄화공정조건의 확립)

  • Lee, In-Seop;Debnath, Sanket
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.179-180
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    • 2012
  • Back ferrule is a circular ring shaped metallic object which is used for fastening, joining or reinforcement during the tube fitting as well as to prevent leakage. Therefore, during tube fitting the leading edge of the back ferrule should be sufficiently hard enough to prevent leakage. In our research, we concentrated the improvement of two major factors. Firstly, to improve the surface hardness of the back ferrule made by AISI 316 Stainless Steel. Secondly, the enhancement of corrosion resistance of back ferrule after plasma treatment. Initially, the corrosion resistance and hardness of the back ferrule (both commercial and without treated) was not good enough for tube fitting but after applying plasma treatment with suitable conditions on ferrule, we improved the corrosion resistance and hardness of the back ferrule dramatically.

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A study on the chucking system in coaxial grinding of ferrule (페룰 동축 연삭시 척킹 시스템에 관한 연구)

  • Kim, Dong-Kil;Lee, Sang-Jo;Ahn, Geon-Jun;Kwak, Chol-Hun
    • Proceedings of the KSME Conference
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    • pp.987-991
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    • 2003
  • Ferrule is widely used as fiber optic connecters. In fiber-optic communications, the shape accuracy such as coaxiality and cylindricity of ferrule affects insertion loss. When coaxial grinding of ferrule supported by two pin, pin alignment and chucking accuracy are very important. In this research, the kinematic behavior of the ferrule center is investigated in the case where cone-shaped center pins and round circle holes which make contact with each other near the edge of the holes, using homeogenous coordinate transformation and numerical analysis. The obtained results are as follows: The alignment errors between center holes cause a sinusoidal displacement of ferrule. And the maximum displacement of ferrule centers increase in proportion to the center pin angle. The relationship between center pins displacement in coaxial grinding and grinding accuracy was explained.

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A Study of Grinding Characteristic of Ferrule (페룰의 연삭 가공 특성에 관한 연구)

  • Lee, S.W.;Choi, H.Z.;Choi, Y.J.;Ahn, G.J.
    • Proceedings of the KSME Conference
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    • pp.974-979
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    • 2003
  • As recently optical communication industry is developed, request of optical communication part is increased. Ferrule is very important part which determines transmission efficiency and quality of information in the optical communication part. Most of ferrule processes are grinding which request high processing precision. Particularly, concentricity and cylindricity of inner and outer diameter is very important. The co-axle grinding process of ferrule is to make its concentricity all of uniform before centerless grinding. Surface integrity of ferrule is affected by kind of grinding wheels, grinding conditions, and characteristic of workpiece and equipment. In this study, surface integrity of workpiece according to change of grinding wheel speed, feed rate, regulating wheel speed and grinding force is investigate to improve the concentricity and roundness of ferrule from many experiments.

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Nondestructive Evaluation of the Flaw in a Ceramic Ferrule by Resonant Ultrasound Spectroscopy (공명초음파분광법을 이용한 페롤의 비파괴결함평가)

  • 김성훈;백경윤;김영남;양인영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.108-117
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    • 2004
  • In this paper, a measuring NDT(nondestructive testing) system using RUS(Resonant Ultrasound Spectroscopy) was built for nondestructive evaluation of the flaw in a ceramic Ferrule. The principle of RUS is that the mechanical resonant frequency of the materials depends on density, and the coefficient of elasticity. The RUS system is the measuring which is to exite specimen and to inspect the difference of natural frequency pattern between acceptable specimen and specimen which has some defects. RUS system is configured of spectrum analyzer, power amplifier, PZT sensor and support frame. For defect evaluation by the RUS, we performed to measure natural frequency of Ferrule, both acceptable and cracked. In the case of Ferrule, the resonant frequency of cracked-Ferrule existed to higher frequency band than acceptable-Ferrule.

Study of Multi Anti-Reflection Coating Thin Film of Ferrule Facet Manufacture and Characteristics (광커넥터 패룰 단면의 다층 무반사 코팅 박막 제작 및 특성에 관한 연구)

  • Ki, Hyun-Chul;Yang, Mung-Hark;Kim, Sun-Hoon;Kim, Sang-Taek;Park, Kyung-Hee;Hong, Kyung-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.408-409
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    • 2007
  • Ferrule function have connect Optical Communication Cable. But Ferrule have important role that is decided transmission efficiency and information quality. Key-point of detailed drawing of ferrule is Anti-Reflection. In the study Broadband Anti-Reflection coating Film was design for ferrule of optical connector and deposited in low temperature by Ion-Assisted Deposition system. Optical thin film materials($Ta_2O_5$, $SiO_2$) were manufactured Index and Film thickness. $Ta_2O_5$ index is 2.123 ~ 2.125 and $SiO_2$ is 1.44 ~ 1.442. Reflection Loss of film deposited on Ferrule is 30.1[dB].

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Grinding Characteristic of ZrO$_2$ Ceramics Ferrule (지르코니아 세라믹스 페룰의 연삭 특성)

  • 이석우;최영재;김기환;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1911-1915
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    • 2003
  • Today optical communication industry is developed; demand of optical communication part is increased. ZrO$_2$ ceramic ferrule is very significant part which determines transmission efficiency and quality of information in the optical communication part by connector of optical fibers. Being different from metal grinding, material removal through brittle fracture plays an important role in ZrO$_2$ ceramic grinding. Most of ZrO$_2$ ceramic ferrule processes are grinding which request high processing precision. Particularly, concentricity and cylindricity of inner and outer diameter are very important. The co-axle grinding process of ZrO$_2$ ceramic ferrule is to make its concentricity all of uniform before centerless grinding. Surface integrity of ZrO$_2$ ceramic ferrule is affected by grinding conditions, and equipment. In this study, surface integrity of workpiece according to such as a change of grinding wheel speed, feed rate, regulating wheel speed and grinding force is investigate to improve the concentricity and roundness of ZrO$_2$ ceramic ferrule from many experiments. Thus, if possible be finding highly efficient and quality grinding conditions.

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Quartz Glass Ferrule의 절단가공 및 상태 감시

  • 김성렬;이돈진;김선호;안중환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.286-286
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    • 2004
  • 초고속 정보통신망 구현에 필수적인 광학 연결용 부품인 광 Ferrule은 광섬유 커넥터의 중요부품으로서 우수한 치수정밀도와 내마모성을 갖추어야 한다. 현재, Ferrule로 사용되는 재료는 지르코니아, 알루미나 등 세라믹 물질이 많이 사용되고 있으며 기계적 강도나 내마모성 면에서는 우수하지만, 피연마속도가 석영섬유에 비해 현저히 작아서 특수한 연마방법을 채택해야 하며 성형성이나 가공성이 나빠 생산효율이 낮고 비용이 비싸다는 단점을 가지고 있다.(중략)

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The Nondestructive Inspection of the Ferrule for the Optical Connector by Resonant Ultransound Spectroscopy (공명초음파분광법에 의한 광컨넥터용 Ferrule의 비파괴검사)

  • 백경윤;황재중;양순호;민한기;양인영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1345-1348
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    • 2003
  • The Ferrule for the Optical Communication Connector is the product to set the optical ares of an optical fiber very precisely. Therefore, it is required high expectations such as high dimensional precision and new including flaws. Up to new the optical instrument has been used for the defeat and shape inspection of the ferrule, but in the paper we examined the detectable defeat and expectation by using Resonant Ultrasound Spectroscopy(RUS). The RUS is the measurement which is to excite specimen and to inspect the difference at natural frequency pattern between acceptable specimen and specimen which has some defeats. We analyzed the difference of natural frequency pattern in the experiment using Spectrum Analyzer. And we compared the results in the experiment with those in the simulation from the explicit finite elements code, Nastran.

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