• Title/Summary/Keyword: Rod Cutting

Search Result 45, Processing Time 0.028 seconds

Development of the Spent Fuel Rod Cutting Device by Cutter Blade Method (Cutter blade 방식에 의한 사용후핵연료봉 절단 장치 개발)

  • 정재후;윤지섭;홍동회;김영환;김도우
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.393-396
    • /
    • 2000
  • Spent fuel rod cutting device should cut a spent fuel rod to an optimal size in order to fast decladding operation. In this paper, for developing spent fuel rod cutting device with cutter blade, rod properties such as dimension and material of zircaloy tube and fuel pellet are investigated at first and then, various methods of existing cutting devices used commercially are investigated and their performance are analyzed and compared. This device is designed to be operated automatically via remote control system considering later use in Hot-Cell (radioactive area) and the mdularization in the structure of this device makes maintenance easy. SUS and Zircaloy-4 are selected as cut material used in the test of spent fuel rod cutting device by cutter blade. In order for constructing the high durable cutter blade, various materials are analyzed in terms of quality, shape, characteristic, and heat treatment, etc. and from these results, spent fuel rod cutting device is designed and manufactured based on the considerations of durability, round shape sustainability of rod cross-section, debris generation, and fire risk, etc.

  • PDF

Experiment on Cutting the SUS and Zircaloy Tubes by Cutter Blade (Cutter blade에 의한 SUS 및 지르칼로이 튜브 절단 실험)

  • 정재후;윤지섭;홍동희;김영환;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2001.04a
    • /
    • pp.651-654
    • /
    • 2001
  • In the dismantling process of nuclear spent fuels, the spent fuel rod cutting process, followed immediately by the decladding process, performs the cutting the spent fuel rods to a proper length for fast decladding operation. In this paper, we analyzed the chemical compositions, mechanical properties, and physical characteristics for SUS and zircaloy tubes in order to identify the feasibility of cutter-blade type in cutting SUS and zircaloy tubes. It is considered that material, shape and angle, and heat treatment for fabricating the highly durable cutter blade and also it is investigated that the round-shape sustenance of cross-section, amount of debris production, and fire occurrence for measuring the cutting performance on SUS and zircaloy tubes, spent fuel rod cutting device is designed to be operated automatically through the remote control system for use in Hot Cell(radioactive) area and the electro-driven mechanical parts are modularized for easy maintenance. Results from various experiments confirm the efficiency of this device.

  • PDF

Interface System Construction for PWR Spent Fuel Rod Cutting and Pellet Pressing Device (PWR 핵연료 봉 커팅 및 펠렛 압출장치에 대한 연계 시스템 구축)

  • 정재후;윤지섭;흥동희;김영환;진재현;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.684-687
    • /
    • 2002
  • The authors have developed two devices which cuts the spend fuel rod to an optimal size and extracts fuel pellet from the pieces of cut fuel rods. These devices are so important to reduce radioactive wastes that some advanced countries developed their own methods and devices. The authors have benchmarked from these methods and devices. For spent fuel rod cutting, the tube cutting method has been chosen. some mechanical properties of the fuel tube and pellet has been carefully considered for an optimal cutting size. For fuel pellet extraction, a mechanically extracting method has been adopted. The existing chemical method have turned out to be inappropriate because it produced large amount of radioactive wastes, in spite of its high fuel recovery characteristics. The developed method has an advantage that it can be applied to other fuel rods that have different shapes and sizes. The two devices are set up and operated in the hot cell where people can not go in, so that the devices have been designed to be controlled remotely and modulated for easy maintenance. And the performance of the devices has been tested by using simulated fuel rod. From the experimental results, the devices are supposed to be useful for reducing radioactive wastes.

  • PDF

The Machining Technique of Connecting Rod through Constant Control of Cutting Speed Method in Ball End Mill Machining (볼엔드밀 가공에서 절삭속도 일정제어기법에 의한 커넥팅로드 가공기술)

  • Kang, Myung-Chang;Jung, Young-Ho;Kim, Jeong-Suk;Moon, Sung-Jun;Kim, Kyung-Kyoon
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.26 no.6
    • /
    • pp.1053-1059
    • /
    • 2002
  • The purpose of this study is to suggest how the machining technique of constant control of cutting speed can improve precision machining and tool life in high speed machining using a ball end mill. Cutting speed is changed in machining fee form surfaces such as connecting rod die. So, we don't have supreme surface form and tool life on machining. To solve this problem we should settle on optimal cutting speeds in free form surface machining. And, to improve precision machining, We must execute high speed machining methods to output optimum NC data using developed constant control of cutting speed program after modeling by CAD/CAM. In this paper, a comparison was made of the cutting precision and tool life in conventional cutting and those in connecting rod machining applying the program developed.

A Study on the Mechanical Properties of Connecting Rod Manufactured by Direct Quenching (단조소입법으로 제조된 컨넥팅로드의 기계적 특성에 관한 연구)

  • 최문일;강성수
    • Transactions of Materials Processing
    • /
    • v.6 no.5
    • /
    • pp.435-445
    • /
    • 1997
  • In order to study the manufacturing possibility of connecting rod by direct quenching method, the difference between connecting rod by direct quenching and that by general heat treatment were investigated by observing microstructure, by measuring mechanical properties, by conducting fatigue testing, and by measuring the amount of tool wear in actual cutting. Connecting rod manufactured by direct quenching had better fatigue life than that by general heat treatment, which was due to homogeneous microstructure, and higher strength. The amount of cutting tool wear of connecting rod by direct quenching was higher than that by general heat treatment, which was due to low machinability and high toughness of tempered martensite microstructure. Therefore it will be added the study of heat treatment and cutting condition for manufacturing by direct quenching.

  • PDF

A Study on the Machining Charcterisitics of Milling of cylinderical Rod Materials for Passenger Car (승용차용 CYLINDER ROD 소재의 밀링 적삭 특성 연구)

  • 채왕석
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1996.03a
    • /
    • pp.143-148
    • /
    • 1996
  • In this paper, we have studied internal quality including chemical compositions, microscopic structure and nonmetalic inclusion of test materials. We have analyzed dynamic characteristics of cutting force of milling including tensile strength value hardness etcs. Test materials are used the tempered carbon steel and the non-tempered carbon steel. The obtained results are as follows: 1.In analyzing internal quality, the tempered carbon steel have typical martensite structure and the non-tempered carbon steel have ferrite+pearlite structure. 2.Yield strength, tensile strength and hardness value are in the non-tempered carbon steel but elongation is maximum value in the tempered carbon steel. 3.Cutting force is smaller non-tempered carbon steel than tempered carbon steel when feed speed and depth of cut is constant. 4.Cutting force is smaller to the tempered carbon steel and smaller non-tempered carbon steel than tempered carbon steel when cutting conditions

  • PDF

Rod Impact Test for the Determination of Dynamic Yield Stress of Metals (금속재료의 동적항복응력 결정을 위한 봉충격시험법)

  • 민옥기;이정민;남창훈;황재준
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.17 no.1
    • /
    • pp.78-89
    • /
    • 1993
  • A new theory based on the modified momentum and energy conservation has been proposed in order to overcome the drawbacks included in previous theories which are used for the determination of dynamic yield stresses and the investigation of dynamic behavior of metals. Then the improvements suggested by the new theory have been manifested through the analysis of the error included in the measurement of deformed length and through the comparison between the new theory, existing theories, and experimental results performed by previous workers. Meanwhile rod impact test has been performed which uses a compressed- air system for the acceleration of flat-ended cylindrical free-cutting brass rods. From the geomtrical measurements of deformed length, the dynamic yield stress of free-cutting brass has determined.

Ultra-precision Grinding Machining of Glass Rod Lens Core With Aspheric (비구면 Glass Rod 렌즈 금형의 초정밀 연삭가공)

  • Kim, Woo-Soon;Kim, Dong-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.18 no.1
    • /
    • pp.76-82
    • /
    • 2009
  • To obtain the surface roughness with nano order, we need a ultra-precision machine, cutting condition, and materials. In this paper, the cutting condition for getting nano order smooth surface of core have been examined experimentally by the ultra-precision machine and diamond wheels. The effects of the cutting velocity, the feed rate and depth of cut on the surface roughness were studied. And also, the surface roughness was measured by the Form Talysurf series PGI 840. The champion data of developed core was surface roughness Rmax 24.6nm, figure accuracy Rmax 68.9nm.

Diamond Film Synthesis by MWCVD and Its Application to Cutting Tools (MWCVD에 의한 다이아몬드 필름의 합성과 절삭 공구에의 응용)

  • 서문규;김윤수
    • Journal of the Korean Ceramic Society
    • /
    • v.30 no.11
    • /
    • pp.979-985
    • /
    • 1993
  • Diamond films were synthesized using CH4-H2-Ar mixture gases by MWCVD, and cutting ability was tested after brazing them onto WC tools. Growth rates were in the range of 0.5~10${\mu}{\textrm}{m}$/hr depending on the deposition conditions, and diamond films with thickness of 100~300${\mu}{\textrm}{m}$ were obtained. Diamond tools brazed by RF induction method showed an enhanced cutting ability in the cutting test of Si single crystal rod.

  • PDF