• Title/Summary/Keyword: Dressing force

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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 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.

A Study on the Ultraprecision Grinding for Brittle Materials With Electrolytic Dressing (전해드레싱에 의한 경취재료의 초정밀 연삭에 관한 연구)

  • 김정두;이연종;이창열
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.6
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    • pp.1486-1496
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    • 1993
  • The diamond wheel with superabrasive is required for mirror-like surface grinding of brittle materials. But the conventional dressing mothod can not apply to the diamond wheel with superabrasive. Recently electrolytic dressing method was developed for cast-iron bonded diamond wheel with superabrasive. This technique can take replace of lapping and polishing. Using the electrolytic dressing, the surface roughness of workpiece was improved largely and grinding force was very low and the continuity of the grinding force was also very improved. In this study, the purpose is the realization of mirror-like surface grinding of ferrite with electrolytic dressing of metal bonded diamond wheel. For application of ultraprecision grinding for brittle material, superabrasive wheel, air spindle and inprocess electrolytic dressing were used. In addition, the effects of pick current and pulse width on ground surface were investigated, and the suitable dressing conditions for ferrite were found out.

Development of CNC Creep-Feed Grinding Machine and Determination of Dressing Conditions using Continuous Dressing (연속드레싱을 이용한 CNC Creep-Feed 연삭기의 개발 및 드레싱조건의 결정)

  • Lee, Young-Wook;Kim, Jong-Kwan;Jung, Yoon-Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.6
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    • pp.51-57
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    • 2007
  • Creep-feed grinding is an effective technology processes to increase the productivity and efficiency in form grinding. This method has, however, some problems which the progress of abrasive wear around the cutting edge is remarkable, grinding force become intense and burn marks on the ground surface occur frequently. In order to solve this problems, it is proposed in this study to dress the grinding wheel continuously during the grinding process. The purpose of this research is. therefore, that CNC creep-feed grinding machine which has a continuous dressing device developed and some grinding experiments for determination of dressing conditions carried out.

원통 플런지 연삭에서의 연삭력에 관한 연구

  • 박종찬;박철우;이상조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.34-38
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    • 1996
  • Cylindrical plunge grinding is widely used for final machining process of precision parts such as automobile, aircraft, measurement units. In order to make parts which have high precison accuracy and high surface integrity, it is neccessary to consider grinding characteristics. these grinding characteristics are closely related grinding force. Soin this study, to examine closely characteristics of grinding force, effects of dressing condition, depth of cut and speed ratio on grinding force are considered. As the result, It is shown that grinding forces are affected bydressing condition, depth of cut and speed ratio and that there exist threshod grinding force and it also affected by dressing conditon.

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A Study on the Dressing Conditions of Diamond Wheel (다이아몬드휠의 드레싱 조건에 관한 연구)

  • 하상백;정재극;이종찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.1020-1024
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    • 1997
  • Recently the use of ceramic materals has been greatly increased in the industries. But machining of the ceramics is quite unproductive because of their high stength,high hardness,and brittleness. The efficiency of the grinding operation of ceramics depends on the preparation of diamond grinding wheel, i.e.,truning and dressing. This paper describes some experimental results on the dressing conditions of diamond grinding wheel. The dressing performance is evaluated by the magnitude of normal grinding force. The better dressed wheels result in the lower normal grinding forces. The dressing performances of copper plate and aluminum oxide dressing stick are compared. The optimum dressing conditions including the grit size of dressing sticks, the depth of the dressing operation, and the dressing speed qre determined.

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A Study on High Efficiency Dressing of Diamond Grinding Wheel (다이야몬드 숫돌의 고능률 Dressing 에 관한 연구)

  • Choi, Kyoung-Il;Kang, Jae-Hoon;Jung, Yoon-Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.8 no.2
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    • pp.106-113
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    • 1991
  • A diamond grinding wheel is generally used to grind hard and brittle materials, such as advanced ceramics. It is, however, quite difficult to dress a diamond grinding wheel efficiently because of its high degree of hardness. In this study, some investigations are carried out to increase dressing efficiecy of resinoid bonded diamond grinding wheel. Dressing forces are measured over a wide range of dressing conditions, and SEM observation of a grinding wheel is carried out. Special attention is paid to comparison between stick method and rotary brake method. Results obtained in this study provide useful information determining reguired dressing time, and for choosing efficient dressing condition for diamond grinding wheel.

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Wheel Loading Diagnosis and De-noising by Wavelet Transform (Wavelet 변환에 의한 숫돌로딩 진단과 노이즈 제거)

  • Yang, J.Y.;Ha, M.K.;Kwak, J.S.;Park, H.M.;Lee, S.J.
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.29-37
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    • 2002
  • The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the diagnosis of grinding conditions in grinding process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. STD11 workpiece was 85 times of machined pieces cut by the WA wheel and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms. At dressing time, the approximation signals were slowly increased and 45 machined times noticed dressing time.

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Monitoring of Grinding Force in Plunge Grinding Process (원통 플런지 연삭시 연삭력에 관한 실험적연구)

  • Park, Jong-Chan;Park, Cheol-Woo;Lee, Sang-Jo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.6 s.165
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    • pp.881-894
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    • 1999
  • Cylindrical plunge grinding is widely used for final machining process of precision parts such as automobile, aircraft, measurement units. But in order to make parts which have high precision accuracy and high surface integrity, it is necessary to consider grinding characteristics due to accumulation phenomena of grinding wheel in plunge grinding process. In this study, in order to examine closely plunge grinding process, grinding power, grinding force, real depth of cut are monitored in transient state, steady state and spark out state. As the result, it is shown that grinding power and force are affected by dressing condition, depth of cut and speed ratio and that there exist threshold grinding force and it also affected by dressing condition. Also considered effects of grinding conditions on surface roughness and roundness of workpiece

A Study on the Mirror Surface Grinding for Brittle Materials with Inprocess E.D.M. Dressing (연속 방전드레싱에 의한 경취재료의 경면연삭에 관한 연구)

  • 김정두;이은상
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.3
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    • pp.785-792
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    • 1994
  • Ferrite is widely used in the material of magnetic head, but is difficult of grinding because of their brittleness and hardness. Therefore, diamond wheel with superabrasive is required for surface grinding of this brittle material. But the conventional dressing method can not apply to the diamond wheel with superabrasive. In this study describes a newly proposed method for carrying out effective inprocess dressing of diamond wheel with superabrasive. Using the IEDD the surface roughness of workpiece was improved and grinding force was very low. Resently IEDD is good method to obtain the efficiency grinding and surface grinding of brittle materials.