• Title/Summary/Keyword: Machining Rate

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

  • Kim, Gyu-Man;Kim, Bo-Hyun;Chu, Chong-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.10
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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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The Effect of Machining Parameters on Tool Electrode Edge Wear and Machining Performance in Electric Discharge Machining (EDM)

  • Cogun, Can;Akaslan, S.
    • Journal of Mechanical Science and Technology
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    • v.16 no.1
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    • pp.46-59
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    • 2002
  • The main purpose of this study is to investigate the variation of tool electrode edge wear and machining performance outputs, namely, the machining rate (workpiece removal rate), tool wear rate and the relative wear, with the varying machining parameters (pulse time, discharge current and dielectric flushing pressure) in EDM die sinking. The edge wear profiles obtained are modeled by using the circular arcs, exponential and poller functions. The variation of radii of the circular arcs with machining parameters is given. It is observed that the exponential function models the edge wear profiles of the electrodes, very accurately. The variation of exponential model parameters with machining parameters is presented.

Feedrate Scheduling for High Speed Machining Based on an Improved Cutting Force Model (향상된 절삭력 모델을 이용한 고속 가공의 이송속도 스케줄링)

  • 이한울;고정훈;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.141-144
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    • 2003
  • This paper proposes an analytical model of off-line feed rate scheduling to obtain an optimum feed rate for high speed machining. Off-line feed rate scheduling is presented as an advanced technology to regulate cutting forces through change of feed per tooth, which directly affects variation of uncut chip thickness. In this paper, the feed rate scheduling model was developed using a mechanistic cutting force model using cutting-condition-independent coefficients. First, it was verified that cutting force coefficients are not changed with respect to cutting speed. Thus, the feed rate scheduling model using the cutting-condition-independent coefficients can be applied to set the proper feed rates for high speed machining as well as normal machining. Experimental results show that the developed fred rate scheduling model makes it possible to maintain the cutting force at a desired level during high speed machining.

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NC Code Post-Processor Considering Metal Removal Rate (절삭부하 예측을 통한 NC코드 후처리시스템)

  • 이기우;노상도;신동목;한형상
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.5
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    • pp.116-123
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    • 2000
  • This paper presents an NC code post-processor that adjusts feedrates to keep the variation of metal removal rate along the tool paths minimum. Metal removal rate is estimated by virtually machining the part, whose surface model is built from a series of NC codes defined in operation plan, with cutting-tool-assembly models, whose geometry are defined in a machining database. The NC code post-processor modifies the feedrates by the adjustment rules, which are based on the machining knowledge for effective machining. This paper illustrates a procedure fur grouping machining conditions and we also show how to determine an adjustment rule for a machining-condition group. An example part was machined and it shows that the variation of cutting force was dramatically reduced after applying the NC code post-processor. The NC code post-processor is expected to increase productivity while maintaining the quality of the machined part.

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A Study on the Improvement of Machining Accuracy in High Speed Machining of STD11 (STD11 금형강의 고속가공에서 가공정밀도 향상에 관한 연구)

  • 이춘만;최치혁;정원지;정종윤;고태조;김태형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.329-334
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    • 2002
  • High-speed machining is one of the most effective technology to improve productivity. Because of the high speed and high feed rate, high-speed machining can give great advantages for the machining of dies and molds. This paper describes on the improvement of machining accuracy in high-speed machining. Depth of cut, feed rate, spindle revolution and cutting force are control factors. The effect of the control factors on machining accuracy is discussed for the results of surface roughness and machining error in Z-direction for the high speed machining of STD11.

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A Study on Characteristics of Cutting Tool Wear by Cooling Method in Rough Machining of Titanium Alloy (티타늄합금 황삭가공에서 냉각방법에 따른 절삭공구 마모특성에 관한 연구)

  • Kim, Gee-Hah
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.5
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    • pp.129-134
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    • 2013
  • Titanium used in industry has been widely applied for aerospace important parts and automobile important parts, etc. because the titanium is higher in strength compared to the steel and light in weight compared to the steel. This study is to investigate the effect of cutting tool cooling method and cutting time on the spindle speed and feed rate of vertical machining center as a parameter to find the rough cutting time in the medium speed cutting machining of the titanium alloy. It is found that the cutting machining heat are increased as the feed rate, cutting time and spindle speed are raised.

A Study on Characteristics of Cutting by Cutting Conditions in Titanium Machining (티타늄 가공의 절삭조건에 따른 가공특성에 관한 연구)

  • Kim, Gee-Hah
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.1
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    • pp.84-89
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    • 2013
  • Titanium used in industry has been widely applied for aerospace engine, structures and spacecraft exterior, etc. because the titanium is higher in strength compared to the steel and light in weight compared to the steel. This study is to investigate the effect of cutting depth and cutting time on the spindle speed and feed rate of vertical machining center as a parameter to find the rough cutting time and cutting depth in the medium speed cutting machining of the titanium alloy. It is found that the cutting machining heat are increased as the cutting depth, feed rate, cutting time and spindle speed are raised.

Development of High Speed Machining Technology (고속절삭가공기술개발)

  • 이춘만;최치혁;정원지;정종윤;고태조;김태형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.266-272
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    • 2002
  • High-speed machining is one of the most effective technology to improve productivity. Because of the high speed and hugh fried rate, high-speed machining can alive great advantages for the machining of dies and molds. This paper describes on the improvement of machining accuracy in high-speed machining. Depth of cut, feed rate and spindle revolution are control factors. The effect of the control factors on machining accuracy is discussed fur the results of surface roughness and machining error in Z-direction of the high speed machining.

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Micro Electrochemical Machining Using Insulated Electrode (절연 전극을 이용한 미세 전해 가공)

  • Park B.J.;Kim B.H.;Chu C.N.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.685-688
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    • 2005
  • In the micro electrochemical machining (MECM) using ultra short pulses, the machining rate is closely related to the tool electrode area. The machining rate varies according to the machining depth or the immersion depth. When using insulated tool electrodes, those depths do not matter. In addition, micro structures with high machining depth can be fabricated because the machining characteristics do not vary with the machining depth. Another advantage of insulated electrodes is prevention of taper shape. Micro structures with high machining depth or high aspect ratio were fabricated using insulated tool electrodes.

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Micro Machining of Aluminium using Pulsed Laser Beam (레이저빔을 이용한 알루미늄의 미세가공)

  • Shin, Hong Shik
    • Journal of Institute of Convergence Technology
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    • v.4 no.2
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    • pp.41-45
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    • 2014
  • Micro fabrication technologies of aluminium have been required to satisfy many demands in technology fields. Pulsed laser beam machining can be an alternative method to accomplish the micro machining of aluminium. Pulsed laser beam can be applied to micro machining such as micro drilling and milling. Using pulsed laser beam, the machining characteristics of aluminium in micro drilling and milling were investigated according to average power, repetition rate, moving speed of spot. The laser beam machining with the optimal conditions can achieve precise micro figures. As a result, micro pattern, text and structures on aluminium surface was successfully fabricated by pulsed laser beam machining.