• Title/Summary/Keyword: micro groove

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Localized Electro-chemical Micro Machining Using Ultra Short Pulses (초단펄스 전해 국부화를 이용한 미세 가공)

  • Ahn, Se-Hyun;Choi, Se-Hwan;Ryu, Shi-Hyoung;Cho, Deok-Ki;Chu, Chong-Nam
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1052-1058
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    • 2003
  • The possibility of micro/nano machining through electro-chemical process is discussed in this research. Electro-chemical dissolution region is localized within 1 ${\mu}m$ by applying ultra short pulses with tens of nanosecond duration. The effects of voltage, pulse duration, and pulse frequency on the localization distance are investigated. Localization distance can be manipulated by controlling the voltage and pulse duration, and various hole shapes are produced including stepped holes and taper free hole. High quality micro-hole with 8 ${\mu}m$ diameter with 20 ${\mu}m$ depth and micro-groove with 9 ${\mu}m$ width with 10 ${\mu}m$ depth are machined on 304 stainless steel.

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Development of Micro Pattern Cutting Simulation Software (미세패턴 가공 시뮬레이션 기술 개발)

  • Lee, Jong-Min;Le, Duy;Kim, Su-Jin;Lee, Seok-Woo;Je, Tae-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.3
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    • pp.218-223
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    • 2009
  • The micro pattern machining on the surface of wide mold is not easy to be simulated by conventional software. In this paper, a software is developed for micro pattern cutting simulation. The 3d geometry of v-groove, rectangular groove, pyramid and pillar patterns are visualized by C++ and OpenGL library. The micro cutting force is also simulated for each pattern.

Analysis of Thermal Performance in a Micro Flat Heat Pipe with Axially Trapezoidal Groove (그루브형 마이크로 히트파이프의 열전달특성에 대한 연구)

  • Suh, Jeong-Se
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.360-364
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    • 2001
  • Numerical Aanlysis is made on the thermal performance of micro heat pipe in a axial flat grooved channel. The flow of liquid and vapor is investigated in trapezoidal grooves and the effect of variable shear stress along the interface of the liquid and vapor considered. The results from this study are obtained in the axial variation of pressure difference between vapor and liquid, contact angle, velocity of liquid and vapor and so forth. In addition, maximum heat transport capacity of micro-heat pipe is provided by varying the operation temperature, and compared with that from Schneider and Devos's model in which the interfacial shear stress is neglected.

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A study on the machining characteristics of the micro grooving for the mold of PDP barrier rib (PDP 격벽 금형의 Micro Grooving 가공 특성에 관한 연구)

  • 이은상;김남훈;이득우;김남경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.542-546
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    • 2003
  • This paper describes the machining characteristics of a developed micro grooving machine. Experiments have been conducted on the various grooving condition such as spindle revolution speed, feed rates and depth of groove. V and U-shaped blade tool and STD11 workpiece was used in this study. Evaluating the machining conditions, RMS and frequency spectrum analysis of AE(acoustic emission) signals according to each conditions were applied. As a result, this study presented the process to optimize micro grooving condition and possibility of application of AE technique in groove machining.

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Friction Property of Angle and Width Effect for Micro-grooved Crosshatch Pattern under Lubricated Sliding Contact (Micro-scale Grooved Crosshatch Pattern의 각도 및 폭에 따른 실험적 미끄럼마찰특성)

  • Chae, Young-Hun;Kim, Seock-Sam
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.2
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    • pp.110-116
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    • 2011
  • The current study investigated the friction property of angle and width effect for micro-scale grooved crosshatch pattern on SKD11 steel surface against bearing steel using pin-on-disk type. The samples fabricated by photolithography process and then these are carry out the electrochemical etching process. We discuss the friction property due to the influence of a hatched-angle and a width of groove on contact surface. We could be explained the lubrication mechanism for a Stribeck curve. So It was found that the friction coefficient depend on an angle of the crosshatch on contact surface. It was thus verified that micro-scale crosshatch grooved pattern could affect the friction reduction. Also, it is play an important a width of groove to be improved the friction property. I was found that friction property has a relationship between a width and an angle for micro-grooved pattern.

Micro-groove Fabrication by Wire Electrochemical Machining with Ultra Short Pulses (와이어 펄스 전해 가공을 이용한 미세 홈 제작)

  • Na Chan Wook;Park Byung Jin;Kim Bo Hyun;Choi Deok Ki;Chu Chong Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.5 s.170
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    • pp.37-44
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    • 2005
  • In this paper, wire electrochemical machining (Wire ECM) with ultra short pulses is presented. Platinum wire with $10{\mu}m$ diameter was used as a tool and 304 stainless steel was locally dissolved by electrochemical machining in 0.1M $H_{2}SO_4$ electrolyte. Wire ECM can be easily applied to the fabrication of arbitrarily shaped micro-grooves without tool wear. The change of machining gap according to applied pulse voltage, pulse on-time and pulse period was investigated and the optimal pulse condition for stable machining was obtained. Using this method, various micro-grooves with less than $20{\mu}m$ width were fabricated.

Cutting Characteristics of Micro grooving by Cutting Environments in High Speed Machining using Ball End Mill (미세홈 고속가공시 절삭유제 공급방식에 따른 가공성 평가)

  • 배정철;정연행;강명창;이득우;김정석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.172-175
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    • 2002
  • High speed machining is one of the most effective technologies to improve productivity. It can give great advantage for manufacture of die and Moulds. However, when machining of micro groove in high speed machining a severely thermal damage was generated on workpiece and cutting tool. Generally, the cutting fluid is used to improve penetration. lubrication. and cooling effect. In order to rise the performance of lubrication. it contains extreme pressure agents (Cl, S, P). But the environment of work room go bad by those additive. Therefore, the compressed chilly air with oil mist system was developed to replace the conventional cutting fluid system. This paper carried out the tests to evaluate the machinability by the cutting environment in high speed micro groove machining of NAK80 (HrC40). Compressed chilly air with oil mist was ejected on the contact area between cutting edge and workpiece. The effect of this developed compressed chilly air with oil mist system was evaluated in terms of tool life. The results showed that the tool lift of carbide tool coated TiAlN with compressed chilly air mist cooling was much longer than that of the dry and flood coolant when cutting the material.

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Effect of the Groove Shape of Ultra Thick Box-Column with Center Segregation under High Heat Input for Corner Welding (중심 편석층이 있는 극후판 박스-칼럼의 대입열 코너이음 용접시 그루브 형상의 영향)

  • 최원규;이종봉;권영두;구남서
    • Journal of Ocean Engineering and Technology
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    • v.16 no.2
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    • pp.72-79
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    • 2002
  • In this study, time-dependent distributions of temperature and stresses, in the box-column welded from ultra thick plates with center segregation, has been analyzed by the commercial finite element package SYSWELD+, for several types and angles of groove. The major points of investigation are the optimum type and angle of groove that minimize weld stress specially at the center segregation, as well as temperature distribution, residual stresses and changes in the mechanical properties. The results can be summarized as follows; 1) Generally the thermal cycle at the root of groove exhibits relatively rapid cooling pattern, however, most of the other part weldment have a slow cooling pattern in all groove types. 2) Most of the micro-structures of weldment are composed of ferrite and pearlite, meanwhile we could find martensite and bainite locally a the root of the groove. 3) Optimum groove type for high heat input welding of box-column corner is a double groove type, and the optimum angle for the groove is 30~$45^{\circ}$ that minimize deformation and weld stress at the center segregation.

Effect of the Number of Nozzle Scanning in Micro-Line Grooving of Glass by Powder Blasting (Powder Blasting을 이용한 유리의 미세 선형 홈 가공시 노즐 주사 횟수의 영향)

  • 박경호;김광현;최종순;박동삼
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.294-299
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    • 2001
  • The old technique of sandblasting which has been used for decoration of glass surface has recently been developed into a powder blasting technique for various materials, capable of producing micro structures larger than 100 m. This paper describes the performance of powder blasting technique in micro-line grooving of glass and the effect of the number of nozzle scanning on the depth and width of line groove. Experimental results showed that increasing the no. of nozzle scanning resulted in the increase of depth and width in grooves. Increase of width which may cause several problems in the precision machining results from wear of mask film.

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