• Title/Summary/Keyword: 소결 다이아몬드 공구

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A Study on the Tool Wear and Prediction of CBN, Poly Crystal and Single Crystal Diamond Tools in Cutting of Nickel (니켈절삭시 CBN, 소결 및 단결정 다이아몬드 공구의 마멸과 예측에 관한 연구)

  • 성기석;김정두
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.1
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    • pp.120-130
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    • 1993
  • Generally, the machinability of materials that have a good mechanical properties is poor. For materials having a high strength, high toughness, high strength in high temperature and wear resistance, it is difficult to remove a chip from work materials. These properties are well shown in a Nickel, so this metal is used in machine materials, semi-conductor industry, metal mold and optical fields etc. But it is limitted in use because of high cost and poor machinability. In this study, the cutting of pure Nickel was conducted to examine wear of CBN, poly crystal diamond (PCD) and single crystal diamond (SCD) tools. From the result, the CBN tool is superior to poly crystal diamond tools or single crystal diamond tools in terms of tool wear and tool wear is predictable from experimental data base.

Machining of Wc-Co alloys with diamond tool (다이아몬드공구에 의한 초경합금의 절삭)

  • 김성청
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.2
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    • pp.102-111
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    • 1997
  • This paper deals with the machinability based on turning of WC-Co allows with the coated and the sintered diamond tools. The main conclusions obtained are as follows. (1) When machining WC-10%Co alloy, the flank wear of sintered diamond tool increases more largely with the increase of cutting speed in comparison with coated diamond tool. The tool wear decreases with the increase of the grain size and nose radius of sintered diamond tool. (2) When machining WC-20%Co alloy, the tool wear and cutting force decrease with the decrease of rake angle. Their exists a certain cutting speed range to exhibit the smallest tool wear in machining the WC-20%Co alloy, and this critical cutting speed becomes higher by 2 times in the case of coated diamond tool compared with sintered diamond tool. (3) The machinability becomes better with the increase of Co content. The effects of cutting speed and feed rate on the roughness of machined surface become smaller with the increase of Co content.

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A Study on the Cutting Characteristics of Glass Fiber Reinforced Plastics by Tool Materials and Type (유리섬유강화 플라스틱의 공구재질 및 형상에 따른 절삭특성에 관한 연구)

  • An, Sang-Ook;Noh, Sang-Lai
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.4
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    • pp.1216-1224
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    • 1996
  • In the use of glass fiber reinforced plastics it is often necessary to cutting the components, but the cutting GFRP is often made difficult by the delamination of composites and the short tool life. In this paper, the machinability of GFRP by mean of tool materials and type was experimentally investigated. By proper selection of cutting tool material and type excellent machining of this workpiece is achieved. The surface quality relate closely with the feed rate and cutting tools.

Effects of Counterpart Materials on Dry Sliding Wear and Friction Behavior of Co-Fe, Co-Ni Bond Materials for Diamond Tools (다이아몬드 공구용 Co-Fe, Co-Ni 본드 소재의 마멸상대재에 따른 건식 미끄럼 마찰 및 마멸거동)

  • 권용진;김용석
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2003.03a
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    • pp.28-28
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    • 2003
  • 고온가압소결(Hot Pressing) 된 다이아몬드 공구용 Co-Fe, Co-Ni계 금속본드의 상온 건식 미끄럼 마멸시험을 행하고, 조성에 따른 각 본드의 마멸 특성을 비교하고 마멸 기구를 규명하였다. 미끄럼 마멸시험은 pin-on-disk 형태의 마멸시험기를 사용하여 각 조성의 성분, 적용하중 그리고 마멸상대재를 변수로 상온, 대기 중에서 실시되었다. 마멸속도는 마멸시험 전후의 시편의 무게 감량을 이론밀도와 거리로 나누어 계산되었다. 마멸기구의 규명을 위하여 시험된 시편의 마멸면과 마멸단면을 SEM과 EDS를 이용하여 분석하였다. 시험 결과 Co-Fe system의 경우 그 마멸속도는 마멸상대재의 영향보다는 Fe 첨가에 따른 시편의 미세조직과 기계적 성질의 차이에 따라 크게 변화하였다. 그러나 Co-Ni system의 마멸속도는 마멸 상대재에 따라 크게 변화하는 것이 관찰되었다. $Al_2$O$_3$를 상대재로 마멸된 경우에는 마멸속도가 시편/상대재 접촉면에서 형성되는 산화층의 영향을 크게 받았고, glass bead(83% SiO$_2$)를 상대재로 한 경우에는 시편의 경도와 마멸속도는 서로 반비례하였다.

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Evaluation of Wet Machining Characteristics of the Presintered Low Purity Alumina with the Ceramic, CBN and Diamond Tools (저순도 알루미나 예비소결체의 절삭유제에 따른 세라믹, CBN, 다이아몬드공구의 가공 특성 평가)

  • Lee, Jae-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.2 s.191
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    • pp.33-40
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    • 2007
  • In this study, presintered and full sintered low purity alumina ceramics were machined with various tools to clarify the effect of cutting fluid in machinability. The main conclusions obtained were as follows. When the presintered ceramics were wet machined with sintered diamond tool, the tool wear becomes extremely large, and higher cutting speed can be used than in the case of full sintered ceramics. The productivity of wet cutting with the sintered diamond tool is much higher than that of dry cutting. In the case of the CBN and ceramic tools, the tool wear were smaller at wet cutting than at dry cutting, especially exhibiting considerably larger grooved tool wear in wet cutting with ceramic tool.

A Study on the Machinability of Fine Ceramics (($Al_2O_3$)) (파인 세라믹 ($Al_2O_3$)의 被削性에 관한 硏究)

  • 김성겸;이용성
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.4
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    • pp.604-610
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    • 1989
  • This paper is concerned with the machinability of fine ceramics(Al$_{2}$O$_{3}$) by using sintered diamond tools. For this purpose, ceramics cutting experiments under various cutting conditions such as cutting speed, feed rate, and others were carried out. The main results are follows : (1) During the cutting of fine ceramics, the used tools were found to be slightly chattering at cutting speed of 70m/min, and at cutting speed of higher than this I found the fine ceramics difficult to be cut. (2) When I used a tool with large nose radius, there occured a small amount of wear on the flank of the tool. However, at the early stage of fine ceramics cutting, the tools with smaller nose radii were required mainly to prevent the chipping of the ceramics. (3) When the materials were dry-cut, the appropriate cutting speel was found to be lower than 40m/min, and when the materials were dry-cut, I could cut them without any difficulty even at the speed of 70m/min, the surface roughness of ceramics cut at the speed of 70m/min was considerly fine. (4) It is generally believed that the principal cutting force is the largest in the case of steels cutting, but I found the thrust cutting force to be larger than any other cutting forces in the case of ceramics cutting.

Tool-Wear Characteristics of the Ceramic, CBN and Diamond Tools in Turning of the Presintered Low Purity Alumina (저순도 알루미나 예비소결체 선삭시의 세라믹, CBN 및 다이아몬드 공구의 마멸 특성)

  • Lee Jae-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.1 s.178
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    • pp.80-88
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    • 2006
  • In this study, unsintered and presintered low purity alumina ceramics were machined with various tools to clarify the machinability and the optimum cutting conditions. The main conclusions obtained were as fellows. Machined with ceramic tool, the ceramics presintered at the temperature range of $1000\~1100^{\circ}C$ showed the best machinability due to the adhesion formed in weared surface within a certain cutting speed range. In the above combination and conditions, the ceramic tool showed the highest productivity through all experiments. The life of CBN tool was longer in machining of the ceramics presintered at $1000^{\circ}C$ than in the case of that presintered at $600^{\circ}C$, but the diamond tool showed adverse tendency. In machining of the ceramics presintered at $1000^{\circ}C$, the ceramic tool exhibits the longest tool life in high speed, the tool lives became extremely worse in the order of CBN tool and diamond tool. However, in the case of the ceramics presintered at $600^{\circ}C$, the diamond tool shows the longest tool life, the tool lives was much worse in the order of CBN tool and ceramic tool.

Hard Turning Machinability of V30 Cemented Carbide with PCD, cBN and PcBN Cutting Tool (초경합금재의 하드터닝에서 공구재종에 따른 절삭성)

  • Heo, Sung-Jung
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.12
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    • pp.47-54
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    • 2008
  • Hard turning process can be defined as a single-point machining process carried out on "hard" materials. The process is intended to replace or limit traditional grinding operations that are expensive, environmentally unfriendly, and inflexible. The purpose of this study is to achieve a systematic understanding of machining characteristics and the effects of machining parameters on cutting force, tool wear shape and chip formation by the outer cutting of a kind of wear resistant tungsten carbide V30. Hard turning experiments were carried out on this alloy using the PCD (Poly Crystalline Diamond), cBN (cubic Boron Nitride) and PcBN (Polycrystalline cubic Boron Nitride) cutting tools. The PcBN and the usual cBN tools were used to be compare with the PCD tool and the dry turning was carried out. The PcBN is attractive as the tool material which replaces the PCD. The tool wear width and cutting force were measured, and the worn tool and chip were observed. The difference of the tool wear mechanism among the three tool materials was investigated.

A Study on the Wearing Behavior of Diamond Tool used to Machining of Ceramics (세라믹스 가공용 다이아몬드 공구 마모에 관한 연구)

  • Park, Sang-Hee;Kim, Kwang-Min;Choi, Seong-Dae;Hong, Young-Bae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.1
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    • pp.73-79
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    • 2011
  • In this study, coring with diamond core drill on the sintered $Al_2O_3$ ceramic plate were carried out with different coring conditions such as various cutting speed and feed rate to evaluate their effectiveness on the wearing behavior of diamond tool and coring quality. The wearing rate of diamond core drill were getting better with increasing cutting speed and feed rate but the quality of cored hole were getting worse as increasing cutting speed and feed rate.