• 제목/요약/키워드: Machining Characteristics

검색결과 1,093건 처리시간 0.025초

미세구멍의 미세방전 가공에서 가공율과 전극소모 특성 (Machining Rate and Electrode Wear Characteristics in Micro-EDM of Micro-Holes)

  • 김규만;김보현;주종남
    • 한국정밀공학회지
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    • 제16권10호
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    • pp.94-100
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    • 1999
  • Micro-EDM is widely used in machining of miro-parts such as micro-shafts and micro-holes. In order to select proper machining conditions and to reduce the machining time, it is necessary to understand machining characteristics under various machining conditions. Micro-hole machining tests were performed with round shape electrodes with different capacitances and voltages of the power source. The effects of the electrode rotational speed and diameter on the machining rate were also observed. From the experimental results, it was found that capacitance and voltage have significant effects on machining rate and the machined surface integrity. With higher capacitance and higher voltage, higher machining rate was observed together with poorer surface integrity. The electrode diameter was also found to have an effect on the machining rate and electrode wear.

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알루미늄 합금(Al7075-T651)의 얇은 벽 고속밀링 가공 시 가공표면 상태와 가공변형 특성 (Investigation of Machined-Surface Condition and Machining Deformation in High-Speed Milling of Thin-Wall Aluminum 7075-T651)

  • 구준영;황문창;이종환;김정석
    • 한국생산제조학회지
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    • 제25권3호
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    • pp.211-216
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    • 2016
  • Al alloys are useful materials having high specific strength and are used in machining of parts having thin-walled structures for weight reduction in aircraft, automobiles, and portable devices. In machining of thin-walled structures, it is difficult to maintain dimensional accuracy because machining deformation occurs because of cutting forces and heat in the cutting zone. Thus, cutting conditions and methods need to be investigated and cutting signals need to be analyzed to diagnose and minimize machining deformation and thereby enhance machining quality. In this study, an investigation on cutting conditions to minimize machining deformation and an analysis on characteristics of cutting signals when machining deformation occurs are conducted. Cutting signals for the process are acquired by using an accelerometer and acoustic emission (AE) sensor. Signal characteristics according to the cutting conditions and the relation between machining deformation and cutting signals are analyzed.

초고속 RPM변화에 따른 니켈-크롬 합금의 밀링가공 특성 평가 (Machining Characteristics of Nickel-Chrome Alloy according to Changing with Ultra High-Speed RPM)

  • 이승준;최수창;김진근;신인동;이득우;이종열
    • 한국기계가공학회지
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    • 제9권2호
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    • pp.1-5
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    • 2010
  • According to the high demand of hybrid components, the hybrid materials development and processing technology were increased in the industry field. Although hybrid materials have various machining technologies, the research about them has rarely been proceed. This study is to carry out results about design technology of miniaturized high-speed air spindle and machining characteristics of hybrid materials using that. We studied machining characteristics in Nickel-Chrome alloy(Ni-Cr) according to change rotating speed using miniaturized high-speed air spindle. As the following results, the change of surface shape and roughness was investigated as the processing conditions such as rotating speed of miniaturized high-speed air spindle.

복합재 하니콤 코어의 형상가공 특성에 관한 실험적 연구 (Experimental Study on Shape Machining Characteristics of Composite Honeycomb Core)

  • 한승우;김해지
    • 한국기계가공학회지
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    • 제13권4호
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    • pp.28-35
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    • 2014
  • A composite honeycomb core is widely used for lightweight aircraft materials. However, the composite honeycomb core coupled with metal-cutting machining processes does not make a very good match. This paper describes an experimental study of the shape-machining characteristics of a composite honeycomb core, in which a five-axis gantry machine is used. The experimental conditions of the offset allowance, tooling condition and feed rate were applied. The shape machining characteristics of a flat surface, a vertical surface, and a concave surface are evaluated by comparing the machining shape and burr characteristics.

Ti-6Al-4V 합금의 절삭특성과 FEM 해석 비교에 관한 연구 (A Study on the Cutting Characteristics and Analysis by a FEM in the Machining of Ti-6Al-4V alloy)

  • 김남용;홍우표;이동주
    • 한국공작기계학회논문집
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    • 제10권6호
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    • pp.29-35
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    • 2001
  • The cutting characteristics of Ti-6Al-4V alloy and total wear when machining Ti-6Al-4V alloy was studied to understand the machining characteristics. This material is one of the strong candidate materials present and future aerospace or met ical applications. Nowadays their usage has already been broaden to commercial applications such as golf club head, finger rings and many decorative items. Anticipating the general use of this material and development of the titanium alloy in domestic facilities, the review and the study of the machining parameters far those alloys are deemed necessary. This study is concentrated to the machining parameters of the Ti-6Al-4V alloy due to their dominant position in the production of tita mum alloys.

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미세 전해 구멍 가공에서의 가공 특성과 시뮬레이션 (Machining Characteristics in Micro Electrochemical Drilling and Simulation)

  • 김보현;이영수;최덕기;주종남
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.1202-1205
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    • 2005
  • Micro hole is one of basic elements for micro device or micro parts. By micro ECM, micro holes less than $50\mu{m}$ in diameter can be machined easily. Machining characteristics of micro ECM were investigated according to machining conditions such as electrolyte concentration and pulse conditions. From the investigation, optimal machining conditions were suggested for micro ECM of stainless steel. For the micro machining with high resolution, the change of machining gap should be predicted. By using electrochemical principle equations, the change of machining gap was simulated.

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방전가공을 이용한 미세구멍 가공 시 절연액, 축전용량과 초음파 부가에 따른 가공특성 (Machining Characteristics of Micro-EDMed Holes According to Dielectric Fluid, Capacitance and Ultrasonic Vibrations)

  • 서동우;이상민;주종남;박민수
    • 한국정밀공학회지
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    • 제24권12호
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    • pp.42-49
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    • 2007
  • When micro holes are machined by EDM, machining characteristics of machined holes are changed according to the machining conditions. Typical machining conditions are the kind of dielectric fluids, capacitance and ultrasonic vibrations. They influence electrode wear, machining time, radial clearance and taper angle. In this paper, machined holes whose depths are 300, 500, $1000\;{\mu}m$ are observed for each machining conditions. Using deionized water as a dielectric fluid makes electrode wear small, machining time short, radial clearance large and taper angle small. High capacitance makes electrode wear high. Ultrasonic vibrations make electrode wear large, machining time short, radial clearance small and taper angle small. From the results of experiments, the optimal machining conditions were obtained to machine highly qualified micro holes.

초경합금의 와이어 방전가공에 의한 특성 (Characteristics in W-EDM of Tungsten Carbide)

  • 맹민재
    • 한국안전학회지
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    • 제16권4호
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    • pp.7-13
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    • 2001
  • Wire electrical discharge machining experiments in conducted to investigate characteristics of acoustic emission (AE) and electrical discharge energy due to current peak (I$_{p}$), pulse on time($\tau$/on/). The AE signals are obtained with a sensor attached to workpiece side. Machining states are identified with scanning electron microscopy and residual stress analyzer. It is demonstrated that the residual stress provide reliable informations about the machining states. Moreover, machining states can be detected successfully using both the residual stress and AE count rate.e.

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집속 이온빔에 의한 3차원 가공 시스템 (3 Dimensional Machining System using Focused ion Beam)

  • 박철우;이종항
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 춘계학술대회 논문집
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    • pp.490-493
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    • 2004
  • There is great difficulty in machine below 10 micrometers by conventional machining methods, such as micro-EDM. However, ultra micro machining using focused ion beam(FIB) is able to machine to 50 nanometers. Bie & moulds techniques are better than one-to-one machining techniques in regards to production costs in the mass production of ultra size structures. Also, it is advantageous to machine die & moulds to the 10 micrometers level by FIB technique rather than other techniques. It is difficult to machine the three dimensional machining, such as micro lens, using FIB system because of their machining characteristics. In this paper, three dimensional machining techniques were properly introduced, and also experiments showed effectiveness of their techniques.

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AL7075의 고속가공특성 평가 (A Study on the Evaluation on High-speed Machining Characteristics of AL7075)

  • 이종현;이동주;이응숙;신보성
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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    • pp.220-224
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    • 2001
  • High-speed machining is one of the most effective technologies to improve productivity. Because of the high speed and high feedrate, high-speed machining can give great advantages for the machining of dies and molds. To perform efficient high-speed machining, evaluation of high speed machinability must be studied preferentially and it can be identified by investigation of cutting force. To measure cutting force in high-speed machining, dynamometer has to have high natural frequency. In this paper, The dynamometer which has high natural frequency used to measure the cutting force in various cutting conditions. High-speed machining characteristics are evaluated by the cutting force, FFT analysis of the cutting force and chip formation.

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