• 제목/요약/키워드: Machining process parameters

검색결과 271건 처리시간 0.027초

합금공구강 SKS3의 와이어컷 방전가공 특성 (Machining Characteristics of SKS3 in Wire Cut Electrical Discharge Machining)

  • 고병두;신명철
    • 한국공작기계학회논문집
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    • 제17권5호
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    • pp.101-106
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    • 2008
  • In the wire cut electrical discharge machining, the optimal machining parameters setting satisfying the requirements of both high efficiency and good quality is very difficult because its process involves a series of complex physical phenomena and the machining parameters are numerous over diverse range. In this paper, the experimental investigation has been performed to find out the influence of the machining parameters on the machining performance such as cutting speed and surface roughness. The selected experimental parameters are no load voltage, discharge peak current and pulse-off time. The experimental results give the guideline for selecting suitable machining parameters.

Taguchi 실험계획법을 이용한 미세입자 분사가공조건 획득에 관한 연구 (Experimental study for the process conditions of abrasive jet machining by Taguchi method)

  • 박동진;이인환;고태조;김희술
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.379-382
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    • 2004
  • Abrasive jet machining (AJM) has a large number of parameters such as powder flow rate, air pressure, diameter of abrasive, stand off distance, material hardness and fracture toughness, etc. It is not easy matter to control those parameter. To achieve high accurate machining, in this study, Taguchi method was used to select process parameters. The objective of the optimization was to get higher material removal rate (MRR). From the experiments and analysis, some process parameters were found to make efficient machining.

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알루미늄 합금 6061에서 와이어 진동부가에 의한 와이어 컷 방전가공에 따른 표면 거칠기 특성 (III) (Characteristics of Surface Roughness According to Wire Vibration and Wire-cut Electric Discharge Machining of Aluminum Alloy 6061 (III))

  • 류청원;최성대
    • 한국기계가공학회지
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    • 제15권1호
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    • pp.81-88
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    • 2016
  • Recently, high-efficiency machining in the production of high-value products with complex shapes has constantly been required along with the need for hybrid machining. In this study, in addition to wire-cut Electric Discharge Machining (EDM) and vibration, we present the possibility of a hybrid process by carrying out an experiment with aluminum alloy, and the hybrid process determines the nature of the surface. The selected experimental parameters are waveform, amplitude, peak current, and two-dimensional (2D) vibration. The experimental results give the guideline for selecting reasonable machining parameters. The surface roughness was improved about 20% with increases in the amplitude of the vibration.

질화규소 세라믹의 레이저 예열선삭에 관한 연구 (I) - 공정변수에 따른 질화규소의 예열특성 및 산화거동 - (A Study on Laser Assisted Machining for Silicon Nitride Ceramics (I) - Preheating Characteristics and Oxidation Behaviors of Silicon Nitride Ceramics with Machining Parameters -)

  • 김종도;이수진;서정;이제훈
    • Journal of Welding and Joining
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    • 제28권4호
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    • pp.61-66
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    • 2010
  • Silicon nitride is widely used as an engineering ceramics because it has high strength, abrasion resistance and corrosion resistance even at high temperature. However, machining of silicon nitride is difficult due to its high hardness and brittleness. Laser assisted machining(LAM) allows effective cutting using CBN tool by locally heating the cutting part to the softening temperature of YSiAlON using the laser beam. The effect of preheating depending on process parameters were studied to find out the oxidation mechanism. If silicon nitride is sufficiently preheated, the surface is oxidized and $N_2$ gas is formed and escapes from the material, thereby making the cutting process more advantageous. During laser preheating process before machining, high temperature results in strong oxidation which makes the bloating, silicate layers and micro cracks. Using the results of these experiments, preheating characteristics and oxidation behavior were found out.

알루미늄 합금 6061에서 와이어 진동부가에 의한 와이어 컷 방전가공에 따른 표면 거칠기 특성(II) (Characteristics of Surface Roughness According to Wire Vibration Wire-cut Electric Discharge Machining of Aluminum Alloy 6061(II))

  • 류청원;최성대
    • 한국기계가공학회지
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    • 제14권4호
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    • pp.100-107
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    • 2015
  • Recently, high-efficiency machining in the production of high-value products with a complex shape has constantly been required with the need for hybrid machining. In this study, in addition to the wire-cut E.D.M. and vibration used to present the possibility of a hybrid process by carrying out the aluminum alloy experiment, the hybrid process determines the nature of the surface. The selected experimental parameters are horizontality, waveform, amplitude, peak current, and frequency. The experimental results give guidelines for selecting reasonable machining parameters. The surface roughness was improved by about 20% with increases in the amplitude of the vibration.

STEP AP224를 이용한 특징형상의 가공 방법에 관한 연구 (A study on the Methodology of Machining process of Features Using STEP AP224)

  • 김야일;강무진
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.145-149
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    • 1997
  • STEP AP224 includes the information of machining feature and tolerances. Machining features are machined from raw material. Tolerance constrain feasible methods of manufacture, strongly influence the cost of manufacture. And tolerances influence the machining process. We need to decide the precedence between features .tool radius and tool direction for minimum tool changes. This paper deals with the method of decision of precedence between features and process parameters using feature information and tolerances in STEP AP224.

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신경망을 이용한 전극 저소모 방전조건 결정 (Determination of EDM parameters for low tool wears utilizing neural networks)

  • 주상윤
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1997년도 추계학술대회 논문집
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    • pp.43-47
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    • 1997
  • Advances in EDM power supplies have made the process competitive in some areas dominated by conventional and numerically controlled machines. This paper will produce more comprehensive data than are presently available and will use this data in applying concepts of optimization based on manufacturer's guide lines utilizing neural networks. A method will be developed for determining the machining parameters of the EDM process considering the conflicting desirability of good surface finish, low tool wear and high rates of metal removal. By the proposed method, one can select machining parameters that can maintain permissible tool wear and obtain maximum machining rates on the system represented by the data.

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Machining Center에서 End Millirh할 때 Torgue에 의한 가공변수의 적응제어에 관한 연구 (A study on the adaptive control of process parameters using torque for end milling operation in machining center)

  • 박천령;윤문철
    • 대한기계학회논문집
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    • 제10권6호
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    • pp.889-897
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    • 1986
  • 본 논문에서는 Koren의 알고리즘을 밀링에 적용하는 ACCCNC시스템을 제안 CNC 시스템에 AC 시스템을 적용할 때 생기는 변수예측과 또 스텝 및 테이퍼의 두 가지 형 상모델에 대한 변수들의 거동 및 그 때의 생산성을 알아보고 또 이 시스템을 밀링에 적용할 때의 이들 시스템의 적용 가능성을 AC-unit 제어실험(control test)을 통하여 그 타당성을 검토하여 실제 CNC 시스템에 AC 시스템을 적용할 수 있도록 하는 ACC-CNC 시스템의 설계기준을 설정하여 시스템의 최적설계의 기초적인 자료를 얻고자 한다.

자유곡면 NC 절삭가공시간 예측 (Estimation of Sculptured Surface NC Machining Time)

  • 허은영;김보현;김동원
    • 한국CDE학회논문집
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    • 제8권4호
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    • pp.254-261
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    • 2003
  • In mold and die shops, NC machining process mainly affects the quality of the machined surface and the manufacturing time of molds and dies. The estimation of NC machining time is a prerequisite to measure the machining productivity and to generate a process schedule, which generally includes the process sequence and the completion time of each process. It is required to take into account dynamic characteristics in the estimation, such as the ac/deceleration of NC machine controllers. Intensive observations at start and end points of NC blocks show that a minimum feedrate, a key variable in a machining time model, has a close relation to a block distance, an angle between blocks, and a command feedrate. Thus, this study addresses regression models for the minimum feedrate estimation on short and long NC blocks considering these parameters. Furthermore, machining time estimation models by the four types of feedrate behaviors are suggested based on the estimated minimum feedrate. To show the validity of the proposed machining time model, the study compares the estimated with the actual machining time in the sculptured surface machining of several mold dies.

Optimization of Product Design to Reduce Environmental Impact of Machining

  • Taha, Zahari;Gonzales, Julirose;Sakundarini, Novita;Ghazila, Raja Ariffin Raja;Rashid, Salwa Abdul
    • Industrial Engineering and Management Systems
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    • 제10권2호
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    • pp.128-133
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    • 2011
  • This paper presents a study on product design optimization to reduce the environmental impact of machining. The objective is to analyze the effect of changing the product design parameters such as its dimensions, and basic features on the environmental impact of machining process in terms of its energy consumption, waste produced and the chemicals and other consumables used up during the process. To realize this objective, we used a CAD model of a product with different design scenarios, and analyze their energy consumption using an environmental impact calculator method developed. The waste produced, and the consumables used up, such as lubricants and coolants were analyzed using environmental emission factors. Optimization methods using Genetic Algorithm and Goal Programming are applied to the product design parameters in order to get the best possible product dimensions with the least environmental impact of the machining process.