• Title/Summary/Keyword: Multi Grinding

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Development of Discontinuous Grinding Wheel with Multi-Porous Grooves(I) -Design, Manufacture and Grinding Characteristics of Discontinuous Grinding Wheel- (다기공홈형 단속지석의 개발에 관한 연구(I) - 단속지석의 설계, 제작 및 연삭특성 -)

  • Kim, J.D.;Jin, D.X.;Lee, Y.S.
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.8
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    • pp.52-59
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    • 1996
  • Conventionally, grinding of stainless steel, aluminium ally, copper alloy, and titanum alloy are difficult to obtain the high quality finish, because they have the mechanical properties such as low hardness, high toughness which result in the loading of wheel and the poor surface finish. Inorder to perform the grinding operations for these sorts of materials easily, the discontinuous grinding wheel with multi-porous grooves has newly been developed. The multi-porous grooves were formed during wheel production. This discontinous grinding wheel increases the grinding performance. It is desirable to use the discontinuous grinding wheel when grinding materials wiht high efficiency and accuracy which is impossible by conventional wheels. In this paper, the constructing and manufacturing method of grinding wheel with multi-proous grooves are explained, and the grinding charateristics of discontinuous grinding wheel are also illustrate.

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Development of Discontinuous Grinding Wheel with Multi-Porous Grooves (다기공홈형 단속연삭지석의 개발에 관한 연구)

  • 김정두
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1996.03a
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    • pp.108-113
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    • 1996
  • Conventionally, grinding of stainless steel, aluminium alloy, copper alloy, and titanum alloy is difficult due to the mechanical properties such as low hardness, high toughness which result in the loading of wheel and the poor surface finish. In order to grind this sort of materials easily, discontinuous grinding wheel with multi-porous grooves was newly developed. The multi-porous grooves were formed during wheel production. This discontinuous grinding wheel drastically increases the grinding performance. It is desirable to use the discontinuous grinding wheel when grinding materials with high efficiency and accuracy which is impossible by conventional wheels. In this paper, the construction and manufacturing method of grinding wheel with multi-porous grooves are explained. The grinding charateristics of discontinuous grinding wheel was also illustrated.

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A Study on the Analysis of Surface Characteristics According to intermittent Ratio of Discontinuous Grinding Wheel with Multi-Porous Grooves (다기공 연삭숫돌의 단속비에 의한 표면특성 분석에 관한 연구)

  • Kim, Jeong-Du;Kang, Youn-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.6
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    • pp.44-51
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    • 1997
  • Crinding of stainless steel, aluminium alloy, copper alloy, and titanium alloy are difficult to obtain high quality finish, because they have the mechanical properties such as low hardness, high toughness. The low hardness and the high toughness result in the loading of wheel and the poor surface finish. In order to perform the grinding operations for these sorts of materials easily, the discontinuous grinding wheel wiht multi-porous grooves has been newly developed. The multi-porous grooves inthe discontinuous grinding wheel were formed during grinding wheel manufacturing process. In this paper, discontinuous grinding wheels having intermittent ratio 0.66, 0.81 and number of grooves 18,32 have been manufactured and grinding surface characteristics of these grinding wheels for SUS304 have been analyzed. Discontinuous grinding temperature according to intermittent ratiohas been also estimated by simulation. The discontinuous grinding wheels increase the grinding performance considerably. It is desirable to use the discontinuous grinding wheel in grinding the materials with high efficiency and accuracy.

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A Study on Electro-deposited Multi-layered Diamond Tool for Grinding Sapphire Wafers (사파이어 절삭용 다층 전착 다이아몬드 공구에 대한 연구)

  • Lim, Goun;Song, William;Hong, Joo Wha
    • Journal of the Korean Society for Heat Treatment
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    • v.30 no.5
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    • pp.222-226
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    • 2017
  • Recently sapphire wafer has expected as smart phone cover material, however, brittle nature of sapphire needed edge grinding processes to prevent early initiation of cracks. Electro-deposited multi-layered groove tools with $35{\mu}m$ diamond particles were studied for sapphire wafer grinding. Solid particle flow behaviors in agitated electrolyte was studied using PIV(Particle Image Velocimetry), and uniform particle distribution in Ni bond were obtained when agitating impeller was located lower part of electrolyte. Hardness values of $400{\pm}50Hv$ were maintained for retention of diamond particles in electro-deposited bond layer. Sapphire wafer edge grinding test was carried out and multi-layered $160{\mu}m$ thick diamond tool showed much greater grinding capabilities up to 2000 sapphire wafers than single-layered $50{\mu}m$ thick diamond electro-deposited tools of 420 wafers. The reason why 3 times thicker multi-layered tools than single-layered tools showed 5 times longer tool lives in grinding processes was attributed to self-dressed new diamond particles in multi-layered tools, and multi-layered diamond tools could be promising for sapphire grinding.

A Study on the Structural Analysis of Automotive Crankshaft Multi Grinding Machine (자동차 크랭크샤프트 멀티 연삭시스템의 구조해석에 관한 연구)

  • Choi, Yun-Seo;Lee, Won-Suk;Hwang, In-Hwan;Park, Hwi-Keun;Jo, Hyun-Taek;Lee, Young-Sik;Kim, Ki-Jung;Song, Soon-Tae;Lee, Jong-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.1
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    • pp.20-25
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    • 2012
  • A Crankshaft multi grinding machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine. The analysis is carried out by FEM simulation using the commercial software. The machine is modeled by placing proper shell and solid finite elements. The results of structural and modal analysis confirmed that the structural characteristics of grinding machine and the structural safety are considered secure.

A Study on the Development of Multi Grinding Machine for Automotive Crankshaft (자동차 크랭크샤프트 멀티 연삭시스템 개발에 관한 연구)

  • Choi, Yun Seo;Park, Hwi Keun;Hwang, In Hwan;Cho, Hyun Taek;Song, Soon Tae;Choi, Jun Seok;Lee, Nam Doo;Lee, Jong Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.11
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    • pp.1147-1151
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    • 2013
  • A Crankshaft Multi Grinding Machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine.

A Study on the Development of Diamond Grinding Wheel with Multi-Porous Structure (다기공 다이아몬드 연삭숫돌의 개발에 관한 연구)

    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.2
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    • pp.100-107
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    • 1998
  • Diamond wheels with fine grains and multi-porous structures are newely trial developed for smoothing and mirror finishing materials. Grinding wheel must have performed both to remove tool marks efficienitly and to contact elastically with curved surfaces, that are employed for ultra precision and high performance grinding of difficult-to materials such as tungsten carbide alloy using tool and die materials, Diamond grains are bonded by a melamine resin to prevent the decrease of machining efficiency due to grain sinking within the bond materials. Also, highly foamed structures are developed to increase the flexibility of the grinding wheel, and to induce self-sharpening by increasing contact pressure between the grinding wheel and workpiece surfaces. In this paper, melamine-bonded diamond wheels try to manufacture, then the forming method of grinding wheel are suggested, and the grinding characteristics of melamine-bonded diamond grinding wheel are also illustrated.

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Off-line Multicritera Optimization of Creep Feed Ceramic Grinding Process

  • Chen Ming-Kuen
    • Proceedings of the Korean Society for Quality Management Conference
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    • 1998.11a
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    • pp.680-695
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    • 1998
  • The objective of this study is to optimize the responses of the creep feed ceramic grinding process simultaneously by an off-1ine multicriteria optimization methodology. The responses considered as objectives are material removal rate, flexural strength, normal grinding force, workpiece surface roughness and grinder power. Alumina material was ground by the creep feed grinding mode using superabrasive grinding wheels. The process variables optimized for the above objectives include grinding wheel specification, such as bond type, mesh size, and grit concentration, and grinding process parameters, such as depth of cut and feed rate. A weighting method transforms the multi-objective problem into a single-objective programming format and then, by parametric variation of weights, the set of non-dominated optimum solutions are obtained. Finally, the multi-objective optimization methodology was tested by a sensitivity analysis to check the stability of the model.

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Experimental Surface Roughness Estimation in Multi-Pass Horizontal Grinding Operations (다회가공 평면연삭작업에서 표면조도의 실험적 예측)

  • 최후곤;김재윤;여명구
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.2
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    • pp.64-72
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    • 2000
  • Surface roughness is one of the most important characteristics in machining processes. This study presents probabilistic models to estimate surface roughness experimentally in multi-pass horizontal surface grinding operations from three independent distributions such as the initial surface roughness distributions of workpiece, the distributions of the wheel radius, and the distributions of distances between major active grains. To specify the model characteristics from surface roughness measurements, either the probability satisfying a given surface roughness or the range of surface roughness satisfying a given probability have been estimated while grinding conditions are fixed. Finally, the relationship between grinding conditions satisfying surface roughness range under a given probability can be established.

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