• 제목/요약/키워드: Manufacturing condition

검색결과 2,031건 처리시간 0.022초

고속가공에서 상태 감시를 위한 계측시스템의 신호특성 (Signal Characteristics of Measuring System for Condition Monitoring in High Speed Machining)

  • 김정석;강명창;김전하;정연식;이종환
    • 한국기계가공학회지
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    • 제2권3호
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    • pp.13-19
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    • 2003
  • The high speed machining technology has been improved remarkably in die/mold industry with the growth of parts and materials industries. Though the spindle speed of machine tool increases, the condition monitoring techniques of the machine tool, tool and workpiece in high speed machining ate incomplete. In tins study, efficient sensing technology in high speed machining is suggested by observing the characteristics of cutting force, gap sensor and accelerometer signal also, machinability of high-speed machining is experimentally evaluated sensing technique to monitor the machine tool and machining conditions was performed.

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초고속 스핀들의 윤활조건 선정을 위한 기초 연구 (A Foundation Study on the Selection of Bearing Lubrication Conditions in High-speed Spindle)

  • 안성환;이춘만
    • 한국기계가공학회지
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    • 제8권1호
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    • pp.3-9
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    • 2009
  • Recently, a high speed cutting is essential requirement to satisfy latest demand of high precision product and machining of hard materials. However heat generation by high speed rotation causes many problems. The machining error and shortening spindle lifetime by thermal stress is typical example. Generation of heat is mostly caused by sliding at the rotor and bearing. For minimization of heat generation at bearing, decision of the condition of proper lubrication is necessary. The thermal study about 40,000rpm spindle by changing the condition of oil-air lubrication method is carried out in this paper. The results of this paper can be used effectively in the decision of oil-air lubrication condition of other types of spindle for machine tools.

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프랙탈 파라미터에 의한 마멸분 형태특징 분석 (Analysis of Shape Characteristics of Wear Particles with Fractal Parameters)

  • 조연상;김영희;박흥식
    • 한국기계가공학회지
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    • 제7권4호
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    • pp.109-114
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    • 2008
  • The fractal dimension aims to quantitatively define the irregular characteristics of the shape in nature. It can be useful in describing morphological characteristics of various wear particles. This paper was undertaken to diagnose failure condition for sliding members in lubrication using fractal dimension. The experiments were undertaken to analyze the shape of wear particles and to diagnose failure condition for sliding members in lubrication using the image processing and the fractal parameters. It was possible to diagnose wear mechanism, friction, and damage state of machines through analysis of shape characteristics for wear particle in driven condition using fractal parameters.

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Liquid metal을 이용한 고속 양면 가공 및 라틴 방격법에 의한 최적 가공 조건 선정 (High Speed Machining of the thin surface parts using liquid metal and selection of machining condition by Latin Square Method)

  • 임표;이희관;양균의
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 추계학술대회 논문집
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    • pp.433-438
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    • 2004
  • The rapid machining of prototypes plays an important role in product process. Rapid Prototyping(RP) is the widespread technology to produce prototype. But, it have many problems such as shrinkage, deformation and formation occurred by hardening of resin and stair shaping, On the contrary, high speed machining(HSM) technology has many advantages such as good quality, low cost and rapid machining time. Moreover, it is possible to use the material of original product. This paper presents manufacture of trial product by HSM and optimization of machining condition for high productivity in the view of manufacturing time and average error. For example, propeller is machined by the surface machining of thin surface parts. Experiments are designed of machining conditions by Latin Square method and machining condition is optimized and selected by ANOVA

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오일미스트 조건에서의 금형강의 최적절삭조건 (Optimum Machining Condition of Die Steel In The Oil-mist Condition)

  • 김상민;김준현;김주현
    • 한국공작기계학회논문집
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    • 제15권2호
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    • pp.59-65
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    • 2006
  • The purposes of using cutting fluid during cutting have been cooling, lubricating, chip washing and anti-corroding. However, the present manufacturing industry restricts the use of cutting fluid because cutting fluid contains poisonous substances which are harmful to the human body. Therefore environmentally conscious machining and technology have more important position in machining process because cutting fluids have significant influence on the environment in milling process. In this study, environmentally conscious machining can be obtained by the way of selecting the optimum machinig conditon using the design of experiment. Cutting using oil-mist showed better cutting characteristics than dry, air and fluid cutting with respect to by cutting force, tool wear and surface roughness. Also, the optimum machining condition for cutting using oil-mist could be selected through Taguchi method.

다구찌 방법을 이용한 Inconel 718 소재의 선삭가공에서 표면거칠기 최적화 (Searching Optimal Cutting Condition for Surface Roughness In Turning Operation on Inconel 718 using Taguchi Method)

  • 차진훈;한상보
    • 한국생산제조학회지
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    • 제19권2호
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    • pp.295-300
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    • 2010
  • Inconel 718 alloy, widely used as material of aircraft engine, has a good mechanical property in high temperature, strong anti-oxidation characteristics in oxidated current over $900^{\circ}C$, and also is not easily digested in the air containing sulfur, therefore, its usage as mechanical component is expanding rapidly. Even though Inconel alloy 718 is difficult to machine, it requires highly precise processing/machining to sustain its component quality of high accuracy. In this paper, general turning operation conditions arc tested to select the best cutting process condition by measuring surface roughness through implementing experiments with orthogonal array of cutting speed, feeding speed and cutting depth as processing parameters based on the Taguchi method. Optimal turning operation conditions are extracted from the proposed experimental models.

프리하든 금형강의 정밀 홀 가공에 관한 연구 (A Study on the Precision Hole Machiningof Pre Hardened Mould Steel)

  • 이승철;조규재;박종남
    • 한국기계가공학회지
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    • 제11권2호
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    • pp.98-104
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    • 2012
  • In this paper, precision processing is carried out for the pre hardened steel(HRC 54), which is one of injection mould materials. Processing characteristics are estimated according to the number of tool cutting blade and roundness is observed by the 3-Dimensional measuring machine. The surface roughness affected by the wire electric discharge machining are measured. Cutting component force of STAVOX is the highest in condition of 2F processing because load per a blade of cutting tool is high. Especially, the difference in Fz is over 20N by cutting load. The slower spindle rotation speed and tool feed rate are, the better cutting component force is. The roundness of hole processed in condition of 4F is good because feed rate is able to be fast. When rotation speed is increased, the surface roughness is decreased. The surface roughness acquired in condition of 2F processing is higher about 50% than 4F processing.

5MW급 해상풍력 Sub-structure Jack-up Platform 수조모형시험 (Ocean Engineering Basic Test for 5MW Offshore Wind Turbine Sub-structure Jack-up Platform)

  • 전정도;전언찬
    • 한국기계가공학회지
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    • 제12권1호
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    • pp.15-21
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    • 2013
  • The safety and stability of 5MW class offshore wind turbine Jack-up platform was investigated through ocean basin experiment. For simulating the environmental condition of yellow sea in the South Korea, diverse waves, winds and currents were performed based on Froude's number. Regular wave and irregular wave based on Froude's number were applied to the wind turbine structure. In experiments, the height and period of regular wave type were scaled down as the 1:50 ratio of real wave condition. Irregular wave type was simulated with TMA(Texel Storm, Marsen and Arsloe)spectrum. The vertical reaction force, resonance period and wave pressure applied to multi-supporters of wind offshore structure were measured experimentally. Finally, the results showed that the capsizing situation of the offshore structure was generated by the severe environmental condition.

반응표면(反應表面) 분석(分析)을 위한 실험계획(實驗計劃)과 그 응용(鷹用) 통계적(統計的) 모형(模型)의 최적화수법론(最適化手法論)을 중심으로 (Application of Analysis of Response Surface and Experimental Designs ; Optimization Methodology of Statistical Model)

  • 이명주
    • 품질경영학회지
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    • 제7권2호
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    • pp.22-28
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    • 1979
  • The problem considered in this paper is to select the vital factor effect to the product quality through the experimental design and analysis of response surface, so as to control the quality improvement of industrial product. In this time, even through the mathematical model is unknown it could be applicable to control the quality of industrial products and to determine optimum operating condition for many technical fields, particulary, for industrial manufacturing process. When a set of data is available from an experimental design, it is often of interest 1:0 fit polynominal repression model in independent variables (eg, time, temperature, pressure, etc) the optimize the response variable (eg. yield, strength etc). This paper proposes a method known to obtain the optimum operating condition, and how to find the condition by using table of orthogonal array experiments, and optimization methodology of statistical model. A criterion can be applied determining to optimum operating conditions in manufacturing industry and improving the fit of response surface which may be used for prediction of responses and quality control of industrial products.

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알루미늄 합금의 스파이럴 상향가공 시 절삭조건이 표면거칠기에 미치는 영향 (Effects of cutting condition on surface roughness in the spiral up milling of aluminum alloy)

  • 천세호
    • 한국기계가공학회지
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    • 제13권4호
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    • pp.83-90
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    • 2014
  • The spiral up milling of an aluminum alloy was performed in this study. In accordance with the cutting condition, the surface roughness behavior and significance of the research with regard to specific factors were analyzed. The cutting speed, feed, and depth of the cut were found to be statistically significant. A higher cutting speed improved the surface roughness. On the other hand, as the feed and depth of the cut increase, the surface roughness decreases. An interaction effect between the feed and depth of the cut was detected. According to the surface roughness in relation to the cutting conditions, the model showed non-linear behavior.