• Title/Summary/Keyword: Grinding operation

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A Study on the Determination of Grinding Wheel Life and Dressing Time Using AE Sensor (AE센서를 이용한 숫돌의 수명판정 및 드레싱시간의 결정에 관한 연구)

  • 전길재;이상태;정윤교
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.1022-1027
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    • 1997
  • The grinding operation is an important machining process for machining of final surface. However. grinding process has inevitable troubles such as loading and glazing for grinding wheel. It is, therefore, an essential research theme to determine the wheel life and the dressing timefor efficient grinding. In this study, AE signals (AEavg) generated in thc grinding operation were measured and the dressing time was determined from the analysis of the AEavg value. To verify the propriety of the obtained result. the AE signals measured on the grinding and the dressing operation were compared with the grinding force signals and the dressing force which were measured at same time. From the obtained result, it was confirmed that the determination of the wheel life and the dressing time by the AE measurement technique proposed in this study can be practically used.

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A five-axis CAM system for free-surface grinding (금형연마작업을 위한 5축 CAM 시스템)

  • 서석환;이민석;김두형
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.1024-1030
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    • 1993
  • In manufacturing press die with free surface, grinding operation is an important post process for surface finish and dimensional accuracy. With the advancement of NC technology. surface grinding operation is increasingly replaced by the gantry type manipulator. As the mechanics for grinding operation is different from machining operation, conventional CAM system for machining operation is hard to apply. In this. paper, we develop a five-axis CAM system by which an efficient gantry trajectory can be planned and verified. The developed system consists of four conceptual modules; namely CAD, PROCESS. CAM, and ANALYSIS. In the CAD module, the machined surface is represented by CL-data or surface modeler, and process parameters are specified by the PROCESS module. Then, the CAM module generates a series of grinding paths based on the grinding mechanics together with process databases for tool spaces and grinding conditions. The generated paths are verified via ANALYSIS module. Validation via real experiments is left for further study.

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A Study on the Determination of Grinding Wheel Life and Dressing Time Using AE Sensor (AE센서를 이용한 숫돌의 수명판정 및 드레싱시간의 결정에 관한 연구)

  • Jun, Kil-Jae;Lee, Sang-Tae;Kim, Nam-Kyung;Jung, Yoon-Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.5
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    • pp.95-102
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    • 2002
  • The grinding operation is an important machining process for machining of final surface. However, grinding process has inevitable troubles such as loading and glazing for grinding wheel. It is, therefore, an essential research theme to determine the wheel life and the dressing time for efficient grinding. In this study, AE signals (AEavg) generated in the grinding operation were measured and the dressing time was determined from the analysis of the AEavg value. To verify the propriety of the obtained result, the AE signals measured on the grinding and the dressing operation were compared with the grinding force signals and the dressing force which were measured at same time. From the obtained result, it was confirmed that the determination of the wheel life and the dressing tilde by the AE measurement technique proposed in this study can be practically used.

Optimization of Grinding Conditions and Prediction of Surface Roughness Using Taguchi Experimental Design (Taguchi 실험계획법에 의한 연삭가공조건 최적화 및 표면거칠기 예측)

  • 곽재섭;하만경
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.7
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    • pp.37-45
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    • 2004
  • Grinding is a finishing operation of products in various areas. Surface roughness of industrial components obtained in grinding operation is a critical quality measure but is a function of many operating parameters and their interactions. To achieve higher surface roughness and to identify the influence of grinding parameters on surface roughness, it is an ideal situation fer using the design of experiments. This paper presents an successful optimization of grinding conditions and prediction of surface roughness using the design of experiments. From the experimental verification tests, it was observed that this approach was useful as a robust design methodology for grinding operation.

A Study on the Application of Laminated Grinding Wheel to Surface Grinding Operation (적층 연삭 숫돌의 평면 연삭 공정 적용에 관한 연구)

  • Guak, Chol-Hoon;Lee, Eun-jong;Kim, Kang
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.9
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    • pp.45-52
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    • 2000
  • To reduce two preprocess operations to one in the surface grinding operation the laminated grinding wheel was introduced and its availability has already been investigated in the cylindrical grinding process. Thus in this study the experiment was carried out to attempt to prove that the laminated grinding wheel can be used in the surface grinding process with respect to the roughness and grinding force.

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A study on the dressing time monitoring method of grinding wheel in surface grinding (연삭가공시 연삭숫돌의 드레싱 시기 검출 방법에 관한 연구)

    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.1
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    • pp.112-118
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    • 1998
  • In surface grinding, the contact between the grinding wheel and workpiece introduce heat and resistance, which restrict the self-dressing of the grits and result in burrs and cracks on the workpiece. Therefore, before or during the grinding operation, it is necessary to self-dress the grinding wheel for more accurate performance. In order to determine the dressing time monitoring method of grinding wheel in surface grinding, a three-dimensional computer simulation of the grinding operation has been attempted based on the contact mechanism and surface-shaping system between the grinding wheel and the workpiece. The optimal dressing time is determined based on the grain wear and work surface roughness.

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Centreless precision grinding of camshafts as an automated operation

  • Petterson, Roger;Lundberg, Torbjorn
    • Journal of the korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.8-12
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    • 1989
  • The development of a microprocessor-controlled centreless grinding station has opened the way for the production of automobile camshafts-from raw casting to precision-finished part-as a fully automated operation. This results in manufacture to finer tolerances, with part-to-part consistency and a floor-to-floor time of half that needed for alternative production methods. Shafts with a grinding length of up to 700 mm can be processed.

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Development of the CAD/CAM System for CNC Universal Cylindrical Grinding Machines (CNC 만능 원통연삭기의 CAD/CAM 시스템 개발)

  • 조재완;김석일
    • Korean Journal of Computational Design and Engineering
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    • v.5 no.4
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    • pp.312-318
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    • 2000
  • In this study, an exclusive CAD/CAM system is developed for enhancing the effectiveness and productivity of CNC universal cylindrical grinding machines on which the external/facing/internal grinding cycles and the wheel dressing cycles are integratively carried out. The CAD/CAM system can manage the various processes such as geometry design, NC code generation, NC code verification, DNC operation, and so on. Especially, the feature-based modeling concept is introduced to improve the geometry design efficiency. And the NC code verification is realized by virtual manufacturing technique based on the real-time analysis of NC codes and the boolean operation between workpiece and wheel.

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Surface Characteristics of Cylindrically Ground Workpiece using Laminated Grinding Wheel (적층연삭숫돌에 의한 원통연삭 가공물의 표면 특성)

  • Kim, Min-Chul;Kim, Kwang-Hee;Lee, Eun-Jong;Kim, Kang
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.3
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    • pp.35-39
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    • 2001
  • The precision grinding process is carried out with fine-cutting operation after coarse-cutting operation. So, the laminated grinding wheel has been developed to reduce the ineffectiveness induced by changing the operations. In this study, to investigate the possibility of the practical use of the laminated grinding wheel, the surface residual stress of the workpiece ground by the laminated grinding wheels was compared with that ground by the general grinding wheel, and the influence of the difference in grain sizes, between the coarse grit and fine grit of the laminated grinding wheel, on the surface roughness of the workpiece was investigated.

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A study on the Grinding Ability Evaluation of Grinding Wheel made in Korea and Japan (한, 일산 연삭 숫돌의 연삭 성능 평가에 관한 연구)

  • 강재훈
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.1
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    • pp.51-57
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    • 1996
  • Although the system for establishing grinding operation standards mainly depends on the simulation method, it is desirable to obtain highly reliable grinding data and to develop experimental technology, And, it also needs to modify the simulation models if the simulation results do not coincide with special situation due to the difference of grinding machine, wheels and workpiece materials. If simple tests are carried out to evaluate these specificity, the reliability and utility of the system can be raised higher. Therefore, it is required for evaluating wheel ability and confirming the validity of the experimental methods as well as the possibility of exchanging the experimental data between Korea and Japan to preform several kinds of grinding experiments. In this paper, experiments of cylindrical plunge grinding were conducted using the wheels of the same specification made by three typical grinding wheel manufacturers both in Korea and Japan, respectively. The grinding power consumption grinding force, the ground surface roughness, and wheel wear were measured under the same dressing the grinding conditions. The average value and standard deviation of the experiment results were calculated to compared the grinding performance of the wheels made in both countries. The experiment results show that the grinding wheel performance of Korea's is nearly equal to that of Japan's for general purpose of grinding operation. In conclusion, it is possible to exchange the experimental data between Korea and japan.

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