• Title/Summary/Keyword: Difficult-to-cut

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Study on Temperature Effect of Difficulty-to-Cut Material in Laser Heat Treatment Process (레이저 열원을 이용한 난삭재 열처리 공정의 온도 효과에 관한 연구)

  • Kim, Dong Hong;Jung, Dong Won;Lee, Choon-Man
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.1
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    • pp.29-33
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    • 2014
  • Recently, Difficult-to-cut materials are used in many manufacturing industry. But the difficult-to-cut materials are difficult-to-cutting process. So difficult to cut material cutting process was used after heat treatment through preheating for easy cutting process. In this study, Inconel 625 was preheating using laser heat source in computer simulation. Laser heat source temperature applied $1290^{\circ}C$ that suitable preheating temperature for Inconel 625. And temperature effects such as temperature distribution for moving heat source studied apply to similar actual process condition. Simulation results for heat treatment effects through temperature distribution verified.

Evaluation of Machinability by Cutting Environments in High-Speed Machining of Difficult-to-cut Materials(Test for Tool Life Using Compressed Chilly Air Cooling) (난삭성 재료의 가공환경변화에 따른 고속가공 특성 평가(압축공기냉각에 의한 공구수명 평가))

  • 김석원;안철수;이득우
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.6
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    • pp.158-163
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    • 2000
  • High speed machining of difficult-to-cut materials generates the concentrated thermal/frictional damage at the cutting edge of the tool and rapidly decreases the tool life. In this paper, the cutting environments, such as dry, fluid coolant, and compressed chilly air coolant, were investigated to improve the tool life. For this study, the compressed chilly air system was manufactured. The experiments were performed for various difficult-to-cut materials and various coated tools. The effectiveness of the developed methods on the basis of tool life was estimated. The results show that the cutting environment using compressed chilly air coolant provided better tool life than using the fluid coolant or using the dry.

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Cutting Force Analysis in End Milling Process for High-Speed Machining of Difficult-to-Cut Materials (난삭재 고속가공에서의 엔드밀링 공정의 절삭력 해석)

  • 전태수
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.359-364
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    • 1999
  • Due to rapid growth of die and mould industries, it is urgently required to maximize the productivity and the efficiency of machining. In recent years, owing to the development of new kinds of material, die and mould materials are much harder and it is more difficult to cut. In this study, the workpiece SKD11(HRC45) is cut with TiAlN coated tungsten-carbide cutting tools. To find the general characteristics of difficult-to-cut materials, orthogonal turning test is performed. Orthogonal cutting theory can be expanded to oblique cutting model. The oblique cutting process in the small cutting edge element has been analyzed as orthogonal cutting process in the plane containing the cutting velocity vector and chip-flow vector. Hence, with the orthogonal cutting data obtained from orthogonal turning test, the cutting forces can be analyzed through oblique cutting model. The simulation results have shown a fairy good agreement with the test results.

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Advanced Machining Technology for Die Manufacturing (금형의 고정도ㆍ고능률 가공기술)

  • 김정석;이득우;정융호;강명창;이기용;김경균;김석원
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.4
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    • pp.48-68
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    • 2000
  • The high-speed machining technology of difficult-to-cut material is needed to achieve the high-efficiency of die manufacturing. The high-speed machining is applied in automobile, airplane and electricityㆍelectro industry etc, because it can improve machining efficiency and productivity with high speed, high power and high rotation. In this study, high speed machinability, tool wear characteristics and its monitoring, characteristics of damaged layer, machinability of difficult-to-cut material, characteristics of a free curved surface and method of CAD/CAM system were introduced to acquire the shortening of machining time, the improvement of machining efficiency and the high quality of machined surface. Therefore, we establish the stabilization condition of difficult-to-cut material machining and present the optimal cutting condition for high-efficiency cutting.

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Comparative Study on the Ceramic and the TiN Coated Ceramic Tools for the Early Fracture (세라믹공구와 TiN피복 세라믹 공구의 초기파손에 관한 비교연구)

  • 이명재
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.4
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    • pp.123-129
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    • 1998
  • Ceramic and CBN tools are available for the difficult-to -cut-materials such as hardened carbon tool steel. stainless steel and etc. Ceramic tools are suitable for continuous turning cut, not for intermittent milling cut. Ceramic tools are likely to be chipped and abruptly broken before the appearance of normal wear in turning. In this study, TiN coated ceramic tools were found to restrain the chipping, breaking and early fracture and to increase the critical cutting velocity owing to TiN coating in PVD method.

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High Speed Ball End Milling for Difficult-to-Cut Materials

  • Lee, Deug-Woo
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.06a
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    • pp.19-27
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    • 2000
  • High speed machining (HSM), specifically end milling and ball end cutting, is attracting interest in the die/mold or aerospace industries for the machining of complex 3D surfaces. HSM of difficult-to-cut materials such as die/mold steels, titanium alloys or nickel based superalloys generates the concentrated thermal/frictional damage at the cutting edge of the tool and rapidly decreases the tool life. Following a brief introduction on HSM and reated aerospace or die/mold work, the paper reviews published data on the effect of cutter/workpiece orientation and cutting environments on tool performance. First, experimental work is detailed on the effect of cutter orientation on tool life, cutting forces, chip formation, specific force and workpiece surface roughness. Cutting was performed using 8 mm diameter PVD coated solid carbide cutters with the workpiece mounted at an angle of 45 degree from the cutter axis. A horizontal downwards cutting orientation proveded the best tool life with cut lengths ∼50% longer than for all other directions (horizontal upwards, vertical downwards, vertical upwards). Second, the cutting environments were investigated for dry, flood coolant, and compressed chilly air coolant cutting. The experiments were performed for various hardened materials and various coated tools. The results show that the cutting environment using compressed cilly air coolant provided better tool life than the flood coolant or the dry.

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Analysis of Cutting Parameters for $Si_3 N_4$-hBN Machinable Ceramics Using Tungsten Carbide Tool (초경공구를 사용한 $Si_3 N_4$-hBN 머시너블 세라믹 가공에서 절삭 파라미터 분석과 결정)

  • 장성민;조명우;조원승;박동삼
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.6
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    • pp.36-43
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    • 2003
  • In machining of ceramic materials, they are very difficult-to cut materials because of there high strength and hardness. Machining of ceramics are characterized by cracking and brittle fracture. Generally, ceramics are machined using conventional method such as finding and polishing. However these processes are generally costly and have low MRR(material removal rate). This paper focuses on determining the optimal levels of process parameters for products with CNC machining center. For this purpose, the optimization of cutting parameters is performed based on experimental design method. A design and analysis of experiments is conducted to study the effects of these parameters on the surface roughness by using the S/N ratio, analysis of ANOVA and F-test. Cutting parameters, namely, cutting speed, feed and depth of cut are optimized with consideration of the surface roughness.

Cutting force analysis in ball-end milling processes of STD11 (STD11의 볼엔드밀링 공정에서의 절삭력 해석)

  • 김남규
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.52-57
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    • 2000
  • STD11 is one of difficult-to-cut materials and its cutting characteristic data is not built enough. A bad cutting condition of it leads to low productivity of die and mould, so it is necessary to evaluate the machining characteristics of STD11. In this paper, the relations of the geometry of ball-end mill and mechanics of machining with it are studied. The helix angle of ball-end mill varies according to a location of elemental cutting edge in the cutting process are difficult to calculate accurately. To calculate instantaneous cutting forces, it is supposed that the tangential, radial and axial cutting force coefficients are functions of elemental cutting edge location. Elemental cutting forces in the x,y and z direction are calculated by coordinate transformation. The total cutting forces are calculated by integrating the elemental cutting forces of engaged cutting edge elements. This model is verified by slot and side cutting experiments of STD11 workpiece which was heat-treated to HRC45.

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GRADING CUT ROSES BY COLOR IMAGE PROCESSING AND NEURAL NETWORK

  • Bae, Y.H.;Seo, H.S.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2000.11b
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    • pp.170-177
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    • 2000
  • Sorting cut roses according to quality is very essential to increase the value of the product. Many factors are involved in determining the grade of cut roses: length, thickness, and straightness of stem, color and maturity of bud, and extra. Among these factors, the stem straightness and bud maturity are considered to be difficult to set proper classification criteria. In this study, a prototype machine and an analysis procedure were developed to grade cut roses according to stem straightness and bud maturity by utilizing color image processing and neural network. The test results indicated 15.8% classification error for stem straightness and 10.0% for bud maturity.

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A Study on Site investigation for Cut Slope Management Manual preparation (절토사면 유지관리 매뉴얼 작성을 위한 현장조사에 관한 연구)

  • Ji, Young-Hwan;Chang, Buhm-Soo;Kim, Yong-Soo;Lee, Jong-Young
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.825-830
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    • 2005
  • Cut slope and facility of management investigation is the protection of humans and properties. it is very important the prevention of disaster facility and the damage of the slope protection facility. It is very difficult to forecast slope stability, disaster possibility and collapse. It will be able to minimize the damage which it prepare against slope facility and cut slope of deformable investigation and collapse and the disaster. therefore those deformable investigation is important. Investigations execute upheaval, crack, sliding for slope and cut slope reinforcement. Investigation executes forecast in place where the construction problem, the effect which the damage in road traffic or the contiguity facility.

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