• Title/Summary/Keyword: 숫돌수명

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Variation of Grinding Force and Wheel Life in Surface Grinding (평면연삭에서 연삭력 변화와 숫돌수명)

  • Choi, S. S.;Koo, Y.;Kwak, J. S.;Ha, M. K.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.1109-1112
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    • 2001
  • In the grinding process, the edge of shape is very important to evaluate the surface roughness and the precision of dimension. To keep precision of product, parameters with respect to the amount of wheel wear have to limit by grinding condition. In this paper, we measured variation of grinding force to seek the grinding characteristics by the amount of wheel wear in surface grinding. Also, we find out that how these condition give influence to wheel life.

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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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Evaluation of Fracture Strength of WA-Vitrified and Resinoid Bond Grinding Wheels by Acoustic Emission (AE에 의한 WA계 비트리파이드 및 레지노이드 結合劑硏削숫돌의 破壞强度評價)

  • 강명순;한응교;권동호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.2
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    • pp.241-251
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    • 1988
  • The purpose of this paper is to evaluate fracture strength of WA-vitrified and resinoid bond grinding wheels by means of acoustic emission. The paper conducts tension test, compression test, splitting tensile test and bending test with AE measuring system. These tests have been carried out in accordance with the grain sizes and grades of grinding wheels. The fracture strength of grinding wheels is evaluated by the clarification of biaxal fracture criterion of Babel and Sines. It clarifies the influence of factors of grinding wheel upon AE characteristics and evaluates the predictability of life of grinding wheels and the perception of fracture.

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.

Determination of decision of wheel life using grinding power (연삭동력을 이용한 숫돌수명 판정)

  • 이상태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.204-209
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    • 1999
  • The dressing time monitoring in cylindrical grinding is very important with respect to machining efficiency. Therefore, the purpose of this paper is to determine the wheel life by monitoring behavior of grinding power for Wa, 19A and GC. For this purpose, we investigated indirectly the attritious wear of grain edge, the loading of grinding wheel and the breakage of grain through the grinding power and the surface roughness under various grinding conditions. From obtained the results, the relationship between the wheel life and the average sectional chip area is examined to guide for the determination of dressing time.

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Grinding Wheel Life in Surface Grinding (평면연삭에서의 연삭수명 평가)

  • Choi, S.S.;Koo, Y.;Heo, J.S.
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.101-108
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    • 2002
  • In the grinding process, the degree of the sharpness in wheel gram affects the surface roughness and the dimensional accuracy. If a wheel with dull grains is used, the grinding force will be increased and the surface roughness deteriorated. To produce a precision component, the magnitude of parameters related to the wear amount of a grinding wheel has to be limited. In this study, a variation of the grinding force and the surface roughness were measured to seek the machining characteristics of the W A and CBN wheels. From the wear amount of the grinding wheel and the removal rate of workpiece, the grinding ratio was calculated. And also the wheel life was determined at a rapid decreasing point of the grinding ratio. The difference between the surface of wheel-workpiece before grinding and after wheel life was clearly verified with a microscopic photo.

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A Study on Determinatino of Wheel Life Using Grinding Power in Cylinderical Grinding (연삭동력을 이용한 숫돌수명 판정)

  • 이상태
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.4
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    • pp.62-67
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    • 2000
  • The dressing time monitoring in cylindrical grinding is very important with respect to machining efficiency. Therefore, the purpose of this paper is to determine the wheel life by monitoring behavior of grinding power for WA, 19A and GC. For this purpose , we investigated indirectly the attritious wear of grain edge, the loading of grinding wheel and the breakage of grain through the grinding power and the surface roughness under various grinding conditions. From obtained the results, the relationship between the wheel life and the average sectional chip area is examined to guide for the determination of dressing time.

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Variation of Grinding Force and Wheel Life in Surface Grinding (평면연삭에서 연삭력 변화와 숫돌수명)

  • Choi, Soung-Sam;Koo, Yang;Kwak, Jae-Seob;Ha, Man-Kyong;Park, No-Kwang
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.59-65
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    • 2002
  • In the grinding process, the degree of the sharpness in wheel grain affects the surface roughness and the dimensional accuracy. If a wheel with dull grains is used, te grinding force will be increased and the surface roughness deteriorated. To produce a precision component, the magnitude of parameters related to the wear amount of a grinding wheel has to be limited. In this study, a variation of the grinding force and the surface roughness were measured to seek the machining characteristics of the WA and CBN wheels. From the wear amount of the grinding wheel and the removal rate of workpiece, the grinding ratio was calculated. And also the wheel life was determined at a rapid decreasing point of the grinding ratio. The difference between the surface of wheel-workpiece before grinding and after wheel life was clearly verified with a microscopic photo.

Form grinding characteristics of Sr ferrite (Sr 페라이트의 총형연삭특성)

  • 김성청;이재우
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.3
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    • pp.21-27
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    • 1997
  • This paper aims to clarify the effects of grinding conditions in form grinding of Sr-ferrite with the electro-plated diamond wheel. The main conclusions obtained were as follows. (1) The flexural strength and surface roughness of ferrite became the best at the peripheral wheel speed of 1700 m/min. (2) In the case of the depth of cut larger than 0.4mm, crack layers is induced in the ground surface, and the fracture type of chips exhibits slight ductile mode in the depth of cut smaller than 0.2mm. (3) Whe the depth of cut exceeds 0.6mm, the wheel life becomes extremely severe due to the large chipping and brack- age in the diamond grains. However, at the depth of cut .leq. 0.05mm, the diamond grain shows abrasive wear. (4) The decrease of flexural strength and the increase of surface roughness is in proportion to the increase of the feed rate. (5) Most effective nozzle setting angles with various delivery conditions of the grinding fluid, such as nozzle position .PHI. , flow rate Q, etc., were made clear.

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A Study on the Relationship between the Chatter Occurrence and Wheel life (채터 발생과 숫돌 수명과의 연관성에 관한연구)

  • Lee, S.T.;Kim, N.K.;Kim, C.S.;Jung, Y.G.
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.117-122
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    • 2002
  • The chatter to raise grinding operating is reduce the precision and the quality. In this study, In reply to AE signal and the normal force generated in the grinding operating were measured (1) the amplitude in the mathematical model of the normal force is the form as to transform an exponential (2) the chatter growth is minus point of an exponent. (3) From the observed wheel aspect after the chatter growth, it was to investigated the concern of the chatter growth and the wheel life.

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