• Title/Summary/Keyword: Tungsten Carbide Endmill

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Regrinding Effect of Flat End-Mill Tool for Recycling of Tungsten Carbide (WC-Co) Material (초경소재 재활용을 위한 플랫 엔드밀공구의 재연삭 효과)

  • Kang, Myung-Chang;Kim, Min-Wook;Kwon, Dong-Hee;Park, In-Duck;Jeong, Young-Keun
    • Korean Journal of Materials Research
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    • v.18 no.12
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    • pp.635-639
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    • 2008
  • In this paper, experimental studies of the regrinding of tungsten carbide (WC-Co) tools for high-speed machining were conducted. Regrinding and a subsequent evaluation test were carried out for a flat endmill tool with diameters of 10 mm and 3 mm using a CNC five-axis tool grinder and a CNC three-axis machining center. Tool wear on the two types of endmill tools increased as the cutting length increased, and the tool wear was not influenced by the regrinding state. In case of the micro endmill with a tool diameter of 3 mm, the effective regrinding time was determined for a flank wear threshold of 0.3 mm considering the tool life according to cutting length. The tool lives of the 10 mm and 3 mm endmill tools were increased by 80% and 72%, respectively. This conclusion proves the Feasibility of the recycling of tungsten carbide materials in the high-speed machining of high-hardened materials for industrial applications.

Performance Evaluation on the Endmill of High Speed Machining for Selection of Tungsten Carbide (WC-Co) Material (초경소재 선정을 위한 고속가공의 엔드밀 성능 평가)

  • Kwon, Dong-Hee;Kim, Jeong-Suk;Kim, Min-Wook;Jeong, Young-Keun;Kang, Myung-Chang
    • Journal of Powder Materials
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    • v.15 no.5
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    • pp.359-364
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    • 2008
  • To satisfy the demand of higher cutting performance, mechanical properties with tungsten carbide (WC-Co) tool materials were investigated. Hardness and transverse rupture strength with WC grain size, Co content and density were measured. Compared to H, K, and S manufacture maker as tungsten carbide (WC-Co) tool materials were used for high-speed machining of end-milling operation. The three tungsten carbide (WC-Co) tool materials were evaluated by cutting of STD 11 cold-worked die steel (HRC25) under high-speed cutting condition. Also, tool life was obtained from measuring flank wear by CCD wear measuring system. Tool dynamometer was used to measure cutting force. The cutting force and tool wear are discussed along with tool material characteristics. Consequently, the end-mill of K, H manufacture maker showed higher wear-resistance due to its higher hardness, while the S maker endmill tool showed better performance for high metal removal.

Machining characteristic of gray cast iron in high speed machining with tungsten carbide endmill (초경 엔드밀에 의한 회주철(GC250)의 고속가공 특성(1))

    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.147-150
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    • 1995
  • High speed machining one of the most effectiv to improve machining accuracy and product in dies and mould. But a study on this is limited to Alumium, light metal etc. This paper presents machining characteristic of gray cast iron in high speed machining with tungsten carbide endmill. It is suggested to measure sutting force, tool wear, surface roughness, surface shape and select of cptimal cutting condition in the high speed machining of gray cast iron. Performance of high speed machine tool was estimated and the relationship between cutting phenomenon and machinabillity was described.

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Investigation of Micro Cutting Characteristics for Tungsten-Carbide Green Part (초경 그린파트 마이크로 절삭가공 특성 분석)

  • Kim, G.H.;Jung, W.C.;Yoon, G.S.;Heo, Y.M.;Kwon, Y.S.;Cho, M.W.
    • Transactions of Materials Processing
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    • v.19 no.3
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    • pp.191-196
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    • 2010
  • Tungsten-carbide as typical difficult-to-cut material has excellent mechanical properties such as high thermal resistivity, mechanical strength and chemical durability. However, it is next to impossible for tungsten-carbide to be fabricated the needed parts by cutting process. In this study, for establishing the micro fabrication method of tungsten-carbide for micro injection or compression molding core, the investigation on micro cutting characteristics of tungsten-carbide green part which is made by powder injection molding process and easy to cut relatively was performed. For this, micro endmilling experiments of tungsten-carbide green part were performed according to various cutting conditions. Finally, the wear trend of micro endmill and the appearance of micro rib according to feed-rate and cutting depth per step were analyzed through SEM images of micro cutting feature and microscope images of micro tools.

Machinability Evaluation of Endmill Tool through Development of Ultra-fine Grain Grade Cemented Tungsten Carbide Material (초미립 초경소재 개발을 통한 엔드밀 공구의 성능 평가)

  • 김홍규;서정태;권동현;김정석;강명창
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.865-869
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    • 1997
  • In recent years, there has been increasing demand of ultra-fine grain graded cemented tungsten carbide material with high hardness and toughness which is used as high speed cutting tool for development in semiconductor, electronics and die/mold industry, which bring into limelight high-precision, high-efficient machining of sculptured surfaces. This paper deals with the performance of variation in the ultra-fine grain graded cemented tungsten carbide material such as grain size, hardness and density varied according to the volume of added elements, Co or TaC, and he changing of mixing, sintering process. Also, the performance of developing material with uniformed grain size of 0.5${\mu}{\textrm}{m}$ is compared with other domestics' & foreign companies' with analyzing and cutting performance testing.

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A Study on the High-Speed Machining of Die/Mold Material Using a Spindle-Speeder (주축증속기를 이용한 금형강의 고속절삭에 관한 연구)

  • 이용철;강명창;이득우;김정석
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.81-87
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    • 1998
  • High-speed machining is one of the most effective technologies to improve productivity. Because of the high speed and high feedrate, high-speed machining can give great advantages for the machining of dies and molds. In this paper, high-speed machining for HP-4 die material was carried out with a coated tungsten carbide ball endmill. In the high-speed machining, the cutting force and surface roughness of workpiece show various characteristics in different cutting conditions. Especially, the surface roughness of the workpiece depends largely on pick feed and feed-per-revolution of the ball endmill. In the condition where pick feed and feed-per-revolution are equal, better surface roughness is measured. By obtaining good surface roughness at high speed, efficiency of machining can be increased.

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Characteristics of Cutting Force and Surface Roughness in the High-Speed Machining of Die Material (금형강의 고속가공시 절삭력 및 표면조도의 특성)

  • 손창수;강명창;이용철;이득우;김정석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.36-40
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    • 1996
  • The high-speed machining is one of the most effective technology to improve productivity. Because of the high speed and high feedrate, high-speed machining can give great advantages for the machining of dies and moulds. In this paper, high-speed milling for HP-4 die material was carried out with coated tungsten carbide ball endmill. In the high-speed machining, the cutting force and surface roughness of workpiece show very various characteristics at different cutting conditions. Especially surface roughness of workpiece depends largely on pick feed and feed per revolution of ball endmill. In the condition that pick feed and feed per revolution are equal, better surface roughness is measured. By obtaining good surface roughness at high speed, efficiency of machining can be increased.

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Cutting Characteristics of Plasma Source Son Implanted Tungsten Carbide Tool (플라즈마 이온주입에 의해 표면 개질한 초경공구의 가공특성)

  • Kang, Seong-Ki;Wang, Duck-Hyun;Kim, Won-Il
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.1
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    • pp.33-40
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    • 2010
  • In this research, the effects for surface Improvement of plasma ion implanted carbide endmill tools were observed by measuring cutting forces and tools wear affecting surface roughness in high speed cutting. From the 2nd ion mass analysis, the oxidation layer was found to be built up by sputtering. The residual gas contamination of oxygen was found to be contained impurities in nitrogen gas. The plasma implanted ion was found to be spreaded, especially the nitrogen was implanted up to 150nm depth as impressed voltage and ion implanting time. It is analyzed as bring surface improvement by spreading deeply forming oxidation on surface. The factors in Analysis of Variance(ANOVA) about mutuality cause reference of cutting force. The cutting force Fx is affected by the interaction of spindle rpm and federate, the cutting force Fy is influenced by spindle rpm and time injected ion, and cutting force Fz is affected by the interaction of impressed voltage and feedrate. Also, it was found that the cutting forces of implanted tools become lower and the surface roughness is improved by the effect of nitrogen according to the implantation.

Tool Wear Characteristics of Tungsten Carbide Implanted with Plasma Source Nitrogen Ions in High-speed Machining (플라즈마 질소 이온 주입한 초경공구의 고속가공시 공구마멸 특성)

  • Park, Sung-Ho;Wang, Duck Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.5
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    • pp.34-39
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    • 2022
  • The ion implantation technology changes the chemical state of the surface of a material by implanting ions on the surface. It improves the wear resistance, friction characteristics, etc. Plasma ion implantation can effectively reinforce a surface by implanting a sufficient amount of plasma nitrogen ions and using the injection depth instead of an ion beam. As plasma ion implantation is a three-dimensional process, it can be applied even when the surface area is large and the surface shape is complicated. Furthermore, it is less expensive than competing PVD and CVD technologies. and the material is The accommodation range for the shape and size of the plasma is extremely large. In this study, we improved wear resistance by implanting plasma nitrogen ions into a carbide end mill tool, which is frequently used in high-speed machining