• 제목/요약/키워드: Plunge

검색결과 130건 처리시간 0.024초

불꽃소멸에 의한 연삭특성에 관한 연구 (A study on the characteristic of grinding by spark-out)

  • 이연종;김정두
    • 오토저널
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    • 제15권3호
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    • pp.120-125
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    • 1993
  • The surface roughness of workpiece is reduced during spark-out. The reduction of roughness is a benefit of spark-out, but spark-out lowers productivity. The characteristics of spark-out are different to those of plunge grinding to which feed is applied. This difference is due to overlapping cutting during spark-out. Effect of spark-out is in proportion to volume of grain wear. This phenomenon is due to different overlapping area. Dressing interval can be enlarged by spark-out, when volume of grain wear is large. In this study, the characteristic of spark-out was studied by spark-out obserbation in various grinding conditions. For this purpose thrust force, spark-out time and surface roughness of workpiece were experimentally investigated in various grinding conditions.

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인공지능형 연삭가공 트러블 인식.처리 시스템 개발 (Development of Intelligent Trouble-Shooting System for Grinding Operation)

  • 하만경;곽재섭;박정욱;윤문철;구양
    • 동력기계공학회지
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    • 제4권2호
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    • pp.25-30
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    • 2000
  • The grinding process is very complex and relates many parameters to control the process. As this reason, a theoretical analysis and a quantitative estimation of the grinding process has not been well established. In this study, the in-process monitoring system was suggested by applying the neural network for monitoring and shooting the malfunction of cylindrical plunge grinding process. This system used the power signals from the electric power meter. This neural network was composed of processing elements [4-(5-5)-3] with 4 identified power parameters. Because sensitivity is blunted some minute vibration components, the simulation result of this system has appeared about 10% erroneous recognition in the uncertain pattern and the average success rate of the trouble recognition was about 90%. Consequently, the developed system, which applied to the power signals, can be recognize enough to monitor the grinding process as in-process.

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LSM을 이용한 연삭 숫돌 마모 모니터링 (Monitoring of Grinding Wheel Wear Using Laser Scanning Micrometer)

  • 주광훈;김현수;홍성욱;박천홍
    • 한국정밀공학회지
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    • 제17권12호
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    • pp.82-87
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    • 2000
  • This paper deals with monitoring of grinding wheel wear in grinding process. A monitoring system is developed in which a laser scanning micrometer is used to measure the circumferential shape as well as the axial shape of grinding wheel. The monitoring system is applied to grinding machines. The experiment results show that the monitoring system is useful not only for monitoring the amount of wear in grinding wheel but also for measuring the apparent diameter of the grinding wheel.

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A Study on the Cost Analysis for the Container Terminal Services based on ABC Approach

  • Ryu, Dong-Ha;Ahn, Ki-Myung;Yoon, Yeo-Sang
    • 한국항해항만학회지
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    • 제35권7호
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    • pp.589-596
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    • 2011
  • Terminal market has rapidly crashed and market rates have taken a sharp plunge. The substantial throughput decrease resulted from the world economic downturn has been a finishing blow to the terminal operators in Busan. Every terminal operator is taking cost saving as its first priority and accelerating structural reform and downsizing. Under the desperate situation, the need of effective cost analysis would be highly required to effectively control operation cost and to develop new services to satisfy the different needs of the customers. Furthermore, terminal operators could reduce unnecessary activities and concentrate their resource on the more cost-effective process through the operation cost analysis. In order to suggest a new framework of the cost control of container terminals, this paper seeks to analyze terminal costs based on ABC approach by processing actual data.

연삭숫돌 주축 및 공작물 회전체 진동을 고려한 원통 연삭 가공의 동특성 해석 (Dynamic Analysis of External Cylindrical Grinding Considering Spindle and Workpiece Vibrations)

  • 최상현;김덕현;안유민
    • 한국정밀공학회지
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    • 제17권6호
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    • pp.192-198
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    • 2000
  • This paper presents multi degree analysis of self-exited vibration of grinding system including spindle and workpiece rotational effect. The governing equations are derived by applying the finite element method to structure of spindle and workpiece rotor and by estimating the grinding force. Vibration analysis is carried out for external cylindrical plunge grinding. Displacement of workpiece and grinding force is simulated with machining time. Using this model, effects of characteristics of spindle bearing and major grinding conditions on chatter growth rate are predicted. Some of results are compared with those of other previous model and show good agreements.

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연삭 동력신호를 응용한 결함진단에 관한 연구 (A Study on the Fault Diagnosis Applied to the Grinding Power Signals)

  • 곽재섭
    • 한국생산제조학회지
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    • 제9권4호
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    • pp.108-116
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    • 2000
  • Undesired trouble such as chatter vibration and burning on the ground surface appears frequently in the cylindrical plunge grinding process. Establishment of a credible fault diagnostic system for the grinding process is the major purpose of this study. Power signals generated during the grinding operation were sampled and analyzed to determine the relationship between grinding troubles and behavior of signal changes. In addition, a neural network was optimized with a momentum coefficient a learning rate, and a structure of the hidden layer through the iterative learning process. Based on the established system, success rates of the trouble recognition were verified.

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Monitoring of Grinding Wheel Wear in Surface Grinding Process by Using Laser Scanning Micrometer

  • Ju, Kwang-Hun;Kim, Hyun-Soo;Hong, Seong-Wook;Park, Chun-Hong
    • International Journal of Precision Engineering and Manufacturing
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    • 제2권1호
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    • pp.81-86
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    • 2001
  • This paper deals with the monitoring of grinding wheel wear in surface grinding process. A monitoring system, which makes use of a laser scanning micrometer, is developed to measure the circumferential shape as well as the axial profile of grinding wheel. The monitoring system is applied to surface grinding processes. The experimental results show that the developed monitoring system is useful not only for monitoring the amount of wear in grinding wheel but also for evaluation the quality of ground surface and determining proper derssing time for the grinding wheel.

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원통연삭 실험자료를 이용한 트래버스 연삭공정중의 형상예측 (Prediction of Form Accuracy during Traverse Grinding of Slender Workpiece Using the Cylindrical Prunge Grinding Data)

  • 박철우;이상조
    • 한국정밀공학회지
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    • 제17권3호
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    • pp.174-183
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    • 2000
  • Non-Parallelism the axial direction occurs during grinding process of long slender shafts. The reason for the axial error is due to elastic deformation of the components, accumulation phenomenon of the grinding and wheel wear during the grinding process. The accumulation phenomenon, the size generation mechanism and the wheel wear process during traverse grinding result in complicated process at each step on the wheel surface. The grinding system stiffness obtained from the stiffness of the center on the tailstock and the workpiece varing according to the relative position of the wheel and the workpiece. Further more, the value of wheel wear increases as the grinding process advances. The above mentioned issues make the shape generation process during traverse grinding quite complicated. This research analyzes the shape generation process in the direction of the work spindle. First, the formulation of the grinding system stiffness was conducted and the simulation analysis method of the traverse grinding was established. Also, a measuring system for assessing the dimensinal accuracy of the workpiece has been developed.

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자동차용 등속조인트의 AXIAL FORCE와 VEHICLE SHUDDER(I) (Vehicle Shudder Associated with Axial Thrust Force of C.V.Joint For Automobile)

  • 오승탁
    • 한국자동차공학회논문집
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    • 제4권2호
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    • pp.198-208
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    • 1996
  • The plunge joints of C.V. Joint for vehicle tend to produce a cyclic axial disturbance at a frequency of three of six times shaft speed, in which this distrubance caused by internal frictional effect is related to joint angle, rotational speed, torque, and joint size. This principal axial thrust force might make vehicle shuddered when coinciding with vehicle frequency of tranverse direction, and be one of reasons to have driver feel uncomfortable, unesay, while driving vehicle. The paper makes analysis of axial thrust force & vehicle shudder through computer simulation, comparing the result with experimental data, and reviewing the effect by changing of variables such as dimensions and driving conditions.

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시험용 이상전원(異狀電源) 발생장치의 개발에 관한 연구 (A Study on the Development of Abnormal Power Source Generator to Evaluate Electronic Appliances)

  • 박찬원;노재관
    • 산업기술연구
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    • 제24권A호
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    • pp.83-90
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    • 2004
  • Generally, electronic appliances are used on the basis of normal power source supply. The power source inevitably includes the abnormal condition, such as, sudden voltage sagging, power interrupt, and induced noises. As the electronic appliances which include micro-controller-based circuits are being increased recently, the controller circuit sometimes malfunctions by the abnormal condition of the power source. This situation causes serious problems such as hitch of electric appliance, fire and medical instrument glitch, which produces serious situations. In this paper, development of power interrupt tester which is highly suitable for an endurance test device under abnormal power source to microprocessor-based circuits is proposed 89C2051 microcontroller is performed to make power interrupt signal, and software controls peripheral hardwares and built-in functions. Experimental results of this study will offer a good application to electronic appliance maker as a test device of hardware and software debugging use.

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