• Title, Summary, Keyword: Grinding

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A Basic Study on the Monitoring of Grinding Burn by Grinding Power Signatures (연삭동력에 의한 Grinding Burn 검지를 위한 기초적 연구)

  • 김건희;이재경;안상욱
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.194-199
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    • 1996
  • Grinding burn formed on the ground surface is related to the maximum temperature of workpiece surface and wheel temperature in the grinding process. The thermal characteristics of workpiece and grinding conditions on the surface temperature of the oxidation growing layer after get out of contact with the grinding wheel. The assumption used in grinding power signatures leads to the local temperature distribution between grinding wheel and workpiece, i.e., a single curve determines temperatures anywhere within the grinding wheel at anytime. This information is useful in the study of the grinding bum penetration into the wheel and thus provides an presentation of grinding trouble monitoring for the burning. On the basis of grinding power signatures in the wheel, thermally optimum conditions are defined and controlled. To cope with grinding burn, the use of grinding power signatures is an effective monitoring systems when occurring the grinding process. In this paper, the identified parameters suggested in this study which are derived from the grinding power signatures are presented.

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A Study on the Grinding Characteristics of Stainless Steel Using Intermittent Grinding Wheel (단속 연삭지석에 의한 스테인레스강의 연삭특성에 관한 연구)

  • Kweun, O-Byung;Kim, Jeong-Du
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.9
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    • pp.2866-2874
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    • 1996
  • In the grinding of difficult-to-materials, the major problmes of conventional grinding are grinding burn, wheel wear, grinding surface crack, loading and glazing, When a conventioanl grinding wheel is used, wheel wear and grinding surface crack easily occur in low heat conductive material and annealed steel. Intermittent grinding is suitable for diffcult-to-matrical such as stainless steel, titanium alloy, aluminum alloy and copper alloy. The purpose of this paper is to develop a new type intermittent wheel of the grinding system for improving the problem of stainless steel grinding, to observe the effect of intermittent grinding on surface quality and grinding characteristics of stainless steel grinding using intermittent grinding wheel. The characteristics of intermittent grinding system improve surface quality, low grinding temperature and low loading.

A Quantitative Study of Grinding Characteristics on Particle Size and Grinding Consumption Energy by Stirred Ball Mill (입자경과 분쇄소비동력의 고찰에 의한 교반볼밀 분쇄특성의 정량적 연구)

  • Choi, Hee-Kyu;Wang, Lin
    • Korean Journal of Materials Research
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    • v.17 no.10
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    • pp.532-537
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    • 2007
  • A series of wet grinding experiments have been carried out using a stirred ball mill to systematically investigate consideration of grinding characteristics. The particle size distribution and median diameter of the grinding consumption power for a given grinding time were considered. Also, the effect of grinding aids on particle size and grinding consumption energy defined as the summation of grinding power was investigated. The grinding aids had influence on the smaller products size and decrease grinding consumption energy because the function of grinding aids were to be attribute to the prevention of agglomeration and ball and grinding chamber wall coating of sample powder. The grinding process seemed to be controlled by the force of agglomeration of the ground products. It was demonstrated that the particle size and grinding consumption energy could be more decreased by the addition of grinding aids.

A Basic Study on the Monitoring of Grinding Burn by Grinding Power Signatures (연삭동력에 의한 Grinding Burn 검지를 위한 기초적 연구)

  • 이재경
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.6 no.1
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    • pp.18-26
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    • 1997
  • Grinding burn formed on the ground surface is related to the maximum temperature of workpiece surface and wheel tempertaure in the grinding process. The thermal characteristics of workpiece and grinding conditions on the surface tempertaure of the oxidation growing layer after get out of contact with the grinding wheel. The assumption used in grinding power signatures leads to the local temperature distribution between grinding wheel and workpiece, i.e., a single curve determines temperatures anywhere within the grinding wheel at anytime. This information is useful in the study of the grinding burn penetration into the wheel and thus provides an presentation of grinding trouble monitoring for the burning. On the basis of grinding power signatures in the wheel, thermally optimum grinding conditions are defined and controlled. To cope with grinding burn, the use of grinding power signatures is an effective monitoring systems when occurring the grinding process. In this paper, the identified parameters suggested in this study which are derived from the grinding power signatures are presented, and prediction model by grinding power utilized a linear regression algorithm is applied.

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Grinding Marks on Ultra-Precision Grinding Spherical and Aspheric Surfaces

  • Chen, Bing;Li, Shichun;Deng, Zhaohui;Guo, Bing;Zhao, Qingliang
    • International Journal of Precision Engineering and Manufacturing-Green Technology
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    • v.4 no.4
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    • pp.419-429
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    • 2017
  • Grinding marks are regard as a great obstacle to manufacture spherical and aspheric surfaces with higher surface quality, lower energy and wastage. The scallop-height was studied for optimizing the grinding parameters firstly to reduce its effect on grinding marks. Secondly, the expression of grinding points distribution was established to characterize the grinding marks caused by the radial run-out of grinding wheel. And then, the aspheric grinding experiments of monocrystalline silicon were carried out to investigate the influence of grinding marks on surface quality. The experiments revealed that the remarkable grinding marks with patterned grinding points distribution would cause more fractures and roughness, deeper grooves, and more inhomogeneous surface quality compared with the weak grinding marks. The discriminating standard of grinding marks was established, and the grinding parameters were optimized for homogenizing the grinding points distribution by this discriminating standard to reduce the grinding marks in actual grinding process. Finally, the large size infrared lens was ground with high surface quality by the optimized grinding parameters, and the results of surface quality demonstrate that the discriminating standard was effective. This research provides references and ideas for grinding aspherical surface with high surface quality and efficiency, low energy and wastage.

Development of the intelligent grinding system for wafer grinding (웨이퍼 연마용 지능형 연삭시스템 개발)

  • Kim, Dong-Seok;Choi, Chun-Kyu;Ha, Sang-Baek;Lee, Sang-Jik
    • Proceedings of the KSME Conference
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    • pp.1082-1086
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    • 2004
  • In silicon wafer manufacturing process, the grinding process has been adopted to improve the flatness of wafer. The grinding of wafer is usually used by the infeed grinding machine. The infeed grinding machine has been depended on imports. Therefore, it is necessary to develop the infeed grinding machine because the demand of the infeed grinding machine is increasing more and more. This paper describes the technologies of infeed grinding machine and intend to introduce the studies in the development of the intelligent grinding system for grinding of wafer. The air bearing spindle for the infeed grinding machine was developed by domestic technologies and the grinding part design of the intelligent grinding system for wafer grinding was completed.

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A Study on the Grinding Force Characteristics in the Internal Plunge Grinding (내면 플런지 연삭에 있어서 연삭력 특성에 관한 연구)

  • Seo, Young-Il;Her, Man-Seung;Choi, Hwan;Lee, Jong-Chan;Cheong, Seon-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.54-59
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    • 1999
  • High precision internal plunge grinding is difficult because of the decrease in the quill stiffness due to the small diameter of wheel. In this paper, the characteristics of internal plunge grinding were investigated. Grinding experiments were performed at various grinding conditions with vitrified bonded CBN wheels. The grinding period was assumed to be consisted of rough grinding and fine grinding. The classification of grinding was determined int terms of the normal grinding forces and actual depth of cut. The experimental results indicate that the higher depth of cut and infeed speed result in the longer rough grinding time. The maximum normal grinding force was nearly equal to the static force and it decreases exponentially as the grinding continues.

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Optimal Supply of Grinding Fluid for Creepfeed Grinding (고능률 연삭을 위한 연삭유제 공급의 최적화)

  • 박재현;홍순익;하만경;송지복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.90-94
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    • 1996
  • Thermal problems of creep-feed grinding are more serious than regular grinding. So grinding fluid supply in creep-feed grinding is very important. Grinding fluid supply quantity is not linear with effectiveness because grinding wheel is porosity material and the grinding area is solid contact area. In this paper, by using AE signal, optimal quantity of fluid supply was determined. And surface characteristics of wet creep-feed grinding were analized.

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A Fundamental Study on High Efficient Grinding with General Grinding Machine (범용 연삭기의 고능률 가공에 관한 기초적 연구)

  • Kim, Nam-Kyung;Song, Ji-Bok
    • Journal of the Korean Society for Precision Engineering
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    • v.7 no.4
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    • pp.65-72
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    • 1990
  • After observing grinding characteristics according to variable grinding condition in order to raise the grinding effect without making worse the grinding quality by using general grinding machine, main conclusions of this study are as follows; 1) When grinding quality is constant, grinding effect is changed according to the speed of the workpiece. But the rapidly increasing critical speed of table is($V_w{\leq}4m/min$). 2) As grinding effect is equal, the lower the speed of the workpiece becomes, the lower the grinding force and surface roughness obtains good results. 3) In terms of grinding method, the down cut grinding method produces good grinding surface royghness in case of little grinding depth;otherwise, the up cut method in case of more grinding depth.

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A Study on the Grinding of Titanium Alloy, Part2 : Grinding characteristics by using Superabrasives (티타늄 합금의 연삭에 관한 연구, Part2 : 초연마재를 사용한 연삭특성)

  • Kim, S. H.;Choi, H.;lee, J. C.;Cheong, S. H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1076-1079
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    • 2001
  • This investigation reports the grinding characteristics of titanium alloy(Ti-6Al-4V). Grinding experiments were performed at various grinding conditions. The grinding forces and grinding force ratio were measured to investigate the grindability of titanium alloy with the Diamond and CBN wheel. To investigate the grinding characteristics of titanium alloy grinding force ratio and grinding ratio were measured. Surface profile of wheel was also measured with tracer and the ground surfaces and chip were observed with SEM. Grinding-ratio of titanium alloy was much lower than that of other materials. Grinding-ratio of titanium alloy with Diamond wheel was almost six times larger than that with CBN wheel.

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