• Title/Summary/Keyword: Multi-tool

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Dectection of tool breakage using multi-sensing system (복합계측시스템을 이용한 공구이상검출)

  • Lee, J.J.;Park, H.Y.
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.2
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    • pp.95-103
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    • 1993
  • In the manufacturing field, some traditional manufacturing and machining methods become weakened the productivity, the external competitive power, and accuracies of the products. In these point of view, the unmanned and intelligent manufacturing systems are proposed by some manufacturing companies. The real-time monitoring technology of the cutting tool conditions i.e. tool wear, tool breakage, crack, and chipping anre necessarily reauired to realize those system, especially. In this study, we constructed the multi- sensing system using the acceleration sensor, the current sensor, and the loadmeter of a machine tool. Also, we analyzed the nose breakage, the massive signal, and some monitoring features by means of the developed system.

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Chaotic analysis of tool wear using multi-sensor signal in end-milling process (엔드밀가공시 복합계측 신호를 이용한 공구 마멸의 카오스적 해석)

  • Kim, J.S.;Kang, M.C.;Ku, S.J.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.11
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    • pp.93-101
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    • 1997
  • Ever since the nonlinearity of machine tool dynamics was established, researchers attempted to make use of this fact to devise better monitoring, diagnostics and control system, which were hitherto based on linear models. Theory of chaos which explains many nonlinear phenomena comes handy for furthering the analysis using nonlinear model. In this study, measuring system will be constructed using multi-sensor (Tool Dynamometer, Acoustic Emission) in end milling process. Then, it will be verified that cutting force is low-dimensional chaos by calculating Lyapunov exponents. Fractal dimension, embedding dimension. And it will be investigated that the relation between characteristic parameter calculated from sensor signal and tool wear.

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A Study on the Fracture Detection of Multi-Point-Tool (다인공구의 파손검출에 관한 연구)

  • Choi, Young Kyu;Ryu, Bong Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.4
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    • pp.67-77
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    • 1995
  • In modern industry the requirement of automation of manufacturing process increases so that unmanned system has been popular as an ultimate goal of modern manufacturing process. In unmanned manufacturing process the tool fracture is a very serious problem because it results in the damage of workpieces and can stop the operation of whole manufa- turing system. In this study, image processing technique is used to detect the fracture of insert tip of face milling using multi-point-tool. In order to acquire the image information of fracture shape of rotation insert tip. We set up the optical system using a light beam chopper. In this system we can reduce the image degradation generated from stopped image of rotating insert tip using image restoration technique. We calculated the mean square error to diagnose the condition of tool fracture, and determind the criteria of tool fracture using experimental and staticstical method. From the results of this study we've developed non- contact detection technique of tool fracture using image processing method and proposed the fracture direction of automation and unmanned system considering the optimal time of tool change milling.

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Multi-channel Audio Service in a Terrestrial-DMB System Using VSLI-Based Spatial Audio Coding

  • Seo, Jeong-Il;Moon, Han-Gil;Beack, Seung-Kwon;Kang, Kyeong-Ok;Hong, Jae-Keun
    • ETRI Journal
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    • v.27 no.5
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    • pp.635-638
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    • 2005
  • Spatial audio coding (SAC) is an extremely high compact representation of encoded multi-channel audio material. This paper suggests a multi-channel audio service in the terrestrial digital multimedia broadcasting (T-DMB) system using a novel SAC tool, which is called a virtual source location information (VSLI)-based SAC tool. Intensive experiments are presented to evaluate the validity of the proposed VSLI-based SAC tool, and prototypical systems are also presented to demonstrate the reliability of the proposed multi-channel T-DMB system in real applications.

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Tool Path Generation of Multi-Patch Sculptured Surface with Reparameterization (여러 개의 패치로 이루어진 곡면에서 재매개변수화를 통한 공구경로 생성)

  • 이성근
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.5
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    • pp.119-126
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    • 2000
  • Recently, according to the various taste of consumers, the design of a product is changed variously and complicatedly. The complicated product is not usually constructed with one path but multi-path. By the way, in machining, higher precision and the reduction of leading and machining time is required. But, for the multi-patch sculptured surface, the amount of machining data becomes large. This means the increase of leading and machining time. In this study, the tool path generation method with reparameterization is proposed for multi-patch sculptured surface and variable step size using NURBS is used to satisfy the precision and to reduce leading and machining time.

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A Study on Analysis of Dynamic Characteristics and Evaluation of Dynamic Compliance of a 5-Axis Multi-tasking Machine Tool by Using F.E.M and Exciter Test (유한요소법과 가진시험법을 이용한 다기능 5축 복합가공기의 동특성 해석 및 동적 컴플라이언스 평가에 관한 연구)

  • Jang, Sung-Hyun;Choi, Young-Hyu;Ha, Jong-Sik
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.18 no.2
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    • pp.162-169
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    • 2009
  • This paper describes a study on dynamic characteristics analysis and dynamic compliance evaluation of a 5-axis multi-tasking machine tool of ram-head type. Structural dynamics analysis and evaluation are necessary to machine tool design and development to secure good machine tool performance against tough and harsh machining conditions. In this study, natural frequencies and corresponding vibration modes of the machine tool structure were analyzed by using both F.E.M. modal analysis and impulse hammer test. Furthermore, dynamic compliance of the machine tool was analyzed by using F.E.M. and also measured by using a hydraulic exciter test. Both the theoretical analysis and experimental test results showed good agreement with each other.

Multi response optimization of surface roughness in hard turning with coated carbide tool based on cutting parameters and tool vibration

  • Keblouti, Ouahid;Boulanouar, Lakhdar;Azizi, Mohamed Walid.;Bouziane, Abderrahim
    • Structural Engineering and Mechanics
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    • v.70 no.4
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    • pp.395-405
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    • 2019
  • In the present work, the effects of cutting parameters on surface roughness parameters (Ra), tool wear parameters (VBmax), tool vibration (Vy) and material removal rate (MRR) during hard turning of AISI 4140 steel using coated carbide tool have been evaluated. The relationships between machining parameters and output variables were modeled using response surface methodology (RSM). Analysis of variance (ANOVA) was performed to quantify the effect of cutting parameters on the studied machining parameters and to check the adequacy of the mathematical model. Additionally, Multi-objective optimization based desirability function was performed to find optimal cutting parameters to minimize surface roughness, and maximize productivity. The experiments were planned as Box Behnken Design (BBD). The results show that feed rate influenced the surface roughness; the cutting speed influenced the tool wear; the feed rate influenced the tool vibration predominantly. According to the microscopic imagery, it was observed that adhesion and abrasion as the major wear mechanism.

Design and Fabrication of Tool Change Multi-nozzle FDM 3D Printer (툴 체인지 방식 멀티 노즐 3D프린터의 설계 및 제작)

  • Suk, Ik-hyun;Park, Jong-kyu
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.2
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    • pp.38-44
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    • 2021
  • To cater to the transition from single-color to multicolor/multi-material printing, this paper proposes a cartridge-replacing type multi-nozzle Fused Depositon Modeling(FDM) three-dimensional (3D) printer. In the test printing run, tool change failure/wobble/layer shift occurred. It was confirmed that improper support was the cause of this tool change failure. As a solution, spline and electromagnetic cartridges were designed. Wobble was caused by machine vibration and the motor stepping out. To minimize wobble, an additional Z-axis was installed, and the four-point bed leveling method was used instead of the three-point bed leveling method. The occurrence of layer shift was ascribed to the eccentricity of the Z-axis lead screw. Therefore, slit coupler was replaced with an Oldham type. In addition to the mechanical supplementation, the control environment was integrated to prevent accidents and signal errors due to wire connections. Before the final test printing run, a rectifier circuit was added to the motor to secure precise control stability. The final test printing run confirmed that the wobble/layer shift phenomenon was minimized, and the maximum error between layers was reduced to 0.05.

A study on the test workpiece for accuracy analysis of multi-axis turning and milling center (선반 및 밀링 겸용 다축 복합가공기의 정밀도 검증을 위한 표준공작물에 대한 연구)

  • Shin, Jae-Hun;Kim, Hong-Seok;Youn, Jae-Woong
    • Journal of the Korea Convergence Society
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    • v.9 no.11
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    • pp.277-284
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    • 2018
  • Recently, the demand for precision machining through multi-axis machining has been greatly increased. However, it is difficult to evaluate the geometrical accuracy of the machine tool because of its complicated geometric relationship. In this study, we organized the KS/ISO specifications which are distributed in various regulations, and re-organized the geometrical precision evaluation items of multi-axis machine tools. In addition, a test workpiece was proposed to evaluate and analyze the accuracy of a multi-axis machine tool, and a test workpiece was machined according to predetermined methods and procedures, and then the machined surfaces were measured using CMM. As a result, it was verified that the machining results of the standard workpiece and the precision of the machine tool were very similar qualitatively and quantitatively. From these results, it can be confirmed that the precision analysis of the multi-axis machine tool is possible only by machining the test workpiece.