• Title/Summary/Keyword: Cutting tool

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Research on the Effect of Cutter Wear on the Torsional Vibration of Spindle in Milling (밀링가공에서 공구마모와 스핀들의 비틀림 진동과의 상관관계에 관한 연구)

  • Kim, Seog-Gwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.9
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    • pp.62-67
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    • 1999
  • In milling, cutting tool ins directly attached to spindle and this tells that spindle can provide very useful information on the cutting tool condition such as wear or breakage. Since spindle is rotating at a high speed, measuring spindle velocity using a noncontacting measurement system gives the best information which can be obtained. Due to the force applied to spindle through cutting tool, velocity of spindle changes. And any change in cutting tool condition affects cutting force and consequently spindle vibration. With the intent of continuously monitoring cutting tool condition in intermittent machining operations in a benign manner, a noncontacting velocity measurement system using a laser Doppler velocimeter was assembled to measure spindle torsional vibration. Spindle vibration was measured and analysis of it in the frequency domain yielded a measure which corresponded to amount of cutting tool wear in milling.

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A Study on the Diagnosis of Cutting Tool States Using Cutting Conditions and Cutting Force Parameters(l) - Signal Processing and Feature Extraction - (절삭조건과 절삭력 파라메타를 이용한 공구상태 진단에 관한 연구(I) - 신호처리 및 특징추출 -)

  • Cheong, C.Y.;Yu, K.H.;Suh, N.S.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.10
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    • pp.135-140
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    • 1997
  • The detection of cutting tool states in machining is important for the automation. The information of cutting tool states in metal cutting process is uncertain. Hence a industry needs the system which can detect the cutting tool states in real time and control the feed motion. Cutting signal features must be sifted before the classification. In this paper the Fisher's linear discriminant function was applied to the pattern recognition of the cutting tool states successfully. Cutting conditions and cutting force para- meters have shown to be sensitive to tool states, so these cutting conditions and cutting force paramenters can be used as features for tool state detection.

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Development of Cermet Cutting Tool by Powder Injection Molding

  • Chung, Seong-Taek;Kwon, Young-Sam
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.493-494
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    • 2006
  • Chip breaker of cutting tool is an important feature to enhance cutting performance. Powder injection molding process was used to produce a triangular-shape cermet grooving insert which has three chip breakers. Attrition milled cermet powders were mixed with wax-based binder system in continuous twin screw extruder. Three-plate injection mold with slide cores was used to produce injection-molded parts. After molding, solvent and thermal debinding was carried out. Sintering was conducted in a batch furnace with a graphite heater. The sintered parts satisfy the requirements of dimensional tolerances and material properties.

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Fabrication of Micro/nanoscale Cutting Tool Geometry of Single Crystal Diamond Tool by Focused Ion Beam (집속이온빔(Focused Ion Beam)에 의한 단결정 다이아몬드 공구의 마이크로/나노스케일 절삭공구 형상 제작)

  • Baek, Seung Yub;Jang, Sung Min
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.3
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    • pp.207-213
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    • 2014
  • A study was carried out to fabricate the cutting tool geometry with micro/nanoscale on the single crystal diamond tool by using the FIB. The FIB technique is an ideal tool for TEM sample preparation that allows for the fabrication of electron-transparent foils. The FIB is appropriate techniques to sample and subsequently define the chemical composition and the structural state of mineral inclusion on the micro/nanoscale. The combination of FIB with a SEM allows for 3D information to be obtained from samples including 3D imaging. Cutting strategies were demonstrated to improve the performance of cutting tool geometry and to generate high aspect ratio micro cutting tool. A finely focused beam of 30keV Ga+ ions was used to mill cutting tool shapes for various micro patterns. Therefore FIB sputtering is used to shape a variety of cutting tools with dimensions in the $1-5{\mu}m$ range and cutting edge radii of curvature of under 50nm.

Study of the thermal deflection error and the deflection error induced by the cutting force (절삭공구의 열변형 오차 및 절삭력 변형 오차에 관한 연구)

  • Oh, Myung-Seok;Yoon, In-Jun;Baek, Dae-Kyun
    • Journal of the Korean Society of Industry Convergence
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    • v.5 no.4
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    • pp.373-378
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    • 2002
  • This paper presents a method to predict tool deflection induced by the thermal distribution and the cutting force using FEM in milling operation. The thermal distribution of cutting tool was predicted using FEM after measuring the temperature of the end of tool and of the tool holder. The thermal deflection of cutting tool was predicted using FEM as well. The tool deflection induced by the cutting force was analyzed with the solid model of cutting tool. An end mill tool caused most of tool deflection comparing to tool holder. Most of thermal deflection came from Z-direction and most of tool deflection induced by the cutting force came from X and Y direction. Precision cutting will be accomplished when tool locations are generated considering the thermal deflection of cutting tool and the tool deflection induced by the cutting force in CAD/CAM.

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A Study on the Improvement of Performance of High Speed Cutting Tool using Magnetic Fluid Grinding Technique(A Performance Estimation of High Speed Cutting Tool) (자기연마기술을 이용한 고속절삭공구의 성능향상에 관한 연구 (고속절삭공구의 성능평가를 중심으로))

  • Cho J.R.;Yang S.C.;Jung Y.G.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.354-361
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    • 2005
  • In high speed cutting process, due to the friction between the tool and workpiece, a temperature rise of contacting part is serious. It need to develop cutting tool for overcoming such a poor condition. So now, some studies, the optimization of tool shapes, the fine grains of tool material, multi-layer coating of tools are processing. If mirror finishing on the tool is processed, there is advantage of relation between chip and tool, because of less friction, and also tool's lift would be increased. As a result mirror like finishing is expected efficient enhancement of tool. Generally, it is too difficult to process by a general way for tools of complex shapes, it is required a new method to process such complex shape tools. The magnetic fluid polishing technique can polish the workpiece of complex shape, because the polishing method which polishes as compress the workpiece by the magnetism abrasives to arrange to the linear according to the line of magnetic force. In this paper, We polished the surface of the high speed cutting tool using the magnetic fluid polishing technique, to enhance the performance of the high speed cutting tool.

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A Study on the Development of Analysis Model for Prediction of Relative Deformation between Cutting Tool and Workpiece (공구와 공작물의 상대적 변형량 예측을 위한 해석모델 개발에 관한 연구)

  • Lee, Mun-Jae;Hwang, Young-Kug;Lee, Choon-Man
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.4
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    • pp.20-26
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    • 2010
  • Any relative deformation between the cutting tool and the workpiece at the machining point, results directly in form and dimensional errors. The source of relative deformations between the cutting tool and the workpiece at the contact point may be due to thermal, weight, and cutting forces. This paper presents an investigation into dry and fluid machining with the objective of evaluating shape accuracy effect for the turning process of Al6061. The thermal distribution of cutting tool and cutting force was predicted using finite element method after measuring the temperature of the tool holder. To reach this goal, shape accuracy turning experiments are carried out according to cutting conditions with dry and fluid machining methods. The variable cutting conditions are cutting speed, depth of cutting and feed rate.

An AFM-based Edge Profile Measuring Instrument for Diamond Cutting Tools

  • Asai, Takemi;Motoki, Takenori;Gao, Wei;Ju, Bing-Feng;Kiyono, Satoshi
    • International Journal of Precision Engineering and Manufacturing
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    • v.8 no.2
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    • pp.54-58
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    • 2007
  • This paper describes an atomic force microscope (AFM)-based instrument for measuring the nanoscale cutting edge profiles of diamond cutting tools. The instrument consists of a combined AFM unit and an optical sensor to align the AFM tip with the top of the diamond cutting tool edge over a submicron range. In the optical sensor, a aser beam is emitted from a laser diode along the Y-axis and focused to a small beam spot with a diameter of approximately $10{\mu}m$ at the beam waist, which is then received by a photodiode. The top of the tool edge is first brought into the center of the beam waist by adjusting it in the X-Z-plane while monitoring the variation in the photodiode output. The cutting tool is then withdrawn and its top edge position at the beam center is recorded. The AFM tip can also be positioned at the beam center in a similar manner to align it with the top of the cutting edge. To reduce electronic noise interference on the photodiode output and thereby enhance the alignment accuracy, a technique is applied that can modulate the photodiode output to an AC signal by driving the laser diode with a sinusoidal current. Alignment experiments and edge profile measurements of a diamond cutting tool were carried out to verify the performance of the proposed system.