• Title/Summary/Keyword: diamond grinding wheel

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A Study on the Grinding Characteristics of Ceramics (세라믹 재료의 연삭 특성에 관한 연구)

  • 정을섭;김성청;김태봉;소의열;이근상
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.3
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    • pp.86-92
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    • 2002
  • In this study, experiments were carried out to investigate the characteristics of grinding and wear process of diamond wheel far ceramic materials. Normal component of grinding resistance of $Al_2$O$_3$ was less then that of $Si_3 N_4$ and $ZrO_2$. This seems to be the characteristics of ceramic tools on work pieces both of high hardness. For the case of $Si_3 N_4$ and $ZrO_2$, as the mesh number of wheel increases, the surface roughness decreases. For the case of $Al_2 O_3$, the surface roughness does not decreases. Specific binding energy decreases as the material removal rate per unit time increases. For the case of $Si_3 N_4$ and $ZrO_2$, grinding is carried out by abrasive wear processes. For the case of $Al_2 O_3$, grinding is carried out by grain shedding process due to brittle fracture.

Properties of Mirror-surface Grinding for Metal Matrix Ceramic Composites (금속기지 세라믹 복합소재의 경면연삭 가공 특성)

  • Kwak, Tae-Soo
    • Journal of the Korean Ceramic Society
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    • v.49 no.1
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    • pp.90-94
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    • 2012
  • This study has been focused on properties of mirror surface grinding technology by ELID(Electrolytic In-process Dressing) for metal matrix ceramic composites using in high precision mirror for optics. The experimental studies have been carried out to get mirror surface by grinding for composites, Al-SiC, Al-graphite and Mg-SiC. Grinding process is carried out with varying abrasive mesh type, depth of cut and feed rate using diamond wheel. The machining result of the surface roughness and condition of ground surface, have been analyzed by use of surface roughness tester and SEM measurement system. ELID grinding technology could be applied successfully for the mirror-surface manufacturing processes in spite of ductility of metal matrix material. As the results of experiments, surface roughness of Al-SiC(45 wt%) has been the most superior in these experimental work-pieces as 0.021 ${\mu}m$ Ra.

High Precision and Effective Grinding using Super Abrasives and ELID (초연삭입자와 ELID를 이용한 고정밀 고능률 연삭가공)

  • Koo, Yang;Kim, Gyung-Nyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.4
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    • pp.25-32
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    • 2003
  • In this study, the grinding characteristics of CBN wheels, such as grinding force and surface roughness, have been compared and analyzed from various working conditions of spindle speed and depth of cut. To actualize high efficient grinding at ceramic and silicon nitride material, electrolytic in-process dressing (ELID) method has been applied at metal bonded diamond and CBN wheels. Super precision grinding using ductile mode at difficult-ta-cut materials could be performed.

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Evaluation on the Optimum Grinding of Aspheric Surface Micro Lens for Camera Phone (휴대폰 카메라용 비구면 마이크로 렌즈 최적 연삭가공 평가)

  • Baek Seung-Yub;Lee Eun-Sang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.2
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    • pp.1-9
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    • 2006
  • As consumers in optics, electronics, aerospace and electronics industry grow, the demand for ultra-precision aspheric surface lens increases higher. To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In the work reported in this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the ground surface roughness and profile accuracy. This paper deals with mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and spherical lens of BK7. The optimization of grinding conditions on ground surface roughness and profiles accuracy is investigated using the design of experiments.

Evaluation of the CNC grinding machine for ultra-precision machining of advanced materials (신소재 경면가공용 CNC 연삭기의 가공성능평가)

  • 김현석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.92-97
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    • 1994
  • The there axis CNC grinding machine tool for ultra-precison mirror surface grinding of advanced materials such as ceramics and other hard and brittle materials was designed and manufactured. The grinding machine is composed of the air spindle, the high damping resin concrete bed, and the three axis CNC controller with the high resolution AC servo motor. To investigate the dynamic properties of the grinding machine, the natural frequencies of the spindle and the headstock were experimentally measured. The truing method using the break truer to revise the shape of the metal bonded diamond wheel was developed. Form the results of the machining using the prototype three axis CNC grinding machine manufactured, the mirror surface were achieved.

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Processing Characteristics of Grinding & Polishing for Si Cathode Development (Si Cathode 개발을 위한 연삭 및 폴리싱 가공특성)

  • Chae, Seung-Su;Lee, Choong-Seok;Kim, Taeck-Su;Lee, Sang-Min;Huh, Chan;Lee, Jong-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.2
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    • pp.26-32
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    • 2010
  • This paper reports some experimental result in grinding and polishing of silicon cathodes used in semiconductor manufacturing process. Cup shape diamond core wheels were used in experiments and the radial and tangential grinding forces were measured with surface roughness. In polishing experiments, flat type and donut type wool polishing tools were tested. The experimental results indicate that the grinding forces are proportional to the material removal rates and the surface roughness are inversely proportional to the spindle speed. The surface roughness of polished Si decreases with polishing time and higher spindle speed.

Selection of optimal machining condition for productivity enhancement of aspheric surface lens (비구면 렌즈의 생산성 향상을 위한 최적가공조건선정)

  • Baek S.Y.;Lee H.D.;Kim S.C.;Lee E.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.561-562
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    • 2006
  • To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In the work reported in this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the grinding surface roughness and profile accuracy. This paper deals with mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and spherical lens of BK7. The optimization of grinding conditions on ground surface roughness and profiles accuracy is investigated using the design of experiments.

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Optimization of ceramic grinding by Applying Taguchi Method (다구찌 방법을 적용한 세라믹 연삭가공의 최적화)

  • 임홍섭;유봉환;소의열;이근상;사승윤
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.155-159
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    • 2002
  • This paper has studied to obtain the grinding characteristics and optimal grinding conditions of ceramics in the grinding with diamond wheel by Taguchi method. Feed rate was most important factor to the surface roughness. In the case of 4{Si_3}{N_4}$ and ${A1_2}{O_3}$, surface roughness value were small at 3m/min of feed rate. In the case of $ZrO_2$. surface roughness value was small at 4m/min of feed rate. Surface roughness have much influenced by major load for the :ii3N4 and $ZrO_2$. On the other hand, ${A1_2}{O_3}$ have more influenced by grain shedding of brittle fracture phenomenon. The major factors affecting the surface roughness and the optimum grinding conditions were obtained with minimum experiment using Taguchi method.

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The Performance Improvement of the Aspheric Form Accuracy by Compensation Machining Program (보정 가공 프로그램을 활용한 비구면 형상정밀도 향상에 관한 연구)

  • Park, Yo-Chang;Yang, Sun-Choel;Kim, Geon-Hee;Lee, Young-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.2
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    • pp.10-15
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    • 2005
  • For the development of compensation machining program, ultra precision grinding used in ultra precision machine and corrective machining was studied. We explored a new rough grinding technique on optical material such as zerodur. The facility used is a polishing machine with a custom grinding module and a range of diamond resin bond wheel. Surface roughness and form accuracy are measured by surface measurement equipment(Form Talysurf series2). Our compensation machining program has complied with a target of producing surface roughness better than $0.05{\mu}m$ Ra and form accuracy of around $0.05{\mu}m$ Rt and has been unveiled as a work-hour model.

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