• 제목/요약/키워드: Machine Tool Spindle System

검색결과 202건 처리시간 0.022초

하이브리드 방식의 절삭력 평준화를 통한 CNC 엔드 밀링에서의 공구 마모 모니터링 시스템 (Tool Wear Monitoring System in CNC End Milling using Hybrid Approach to Cutting Force Regulation)

  • 이강재;양민양
    • 한국기계가공학회지
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    • 제3권4호
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    • pp.20-29
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    • 2004
  • A Tool wear monitoring system is indispensable for better machining productivity with guarantee of machining safety by informing the tool changing time in automated and unmanned CNC machining. Different from monitoring using other signals, the monitoring of spindle current has been used without requiring additional sensors on machine tools. For the reliable tool wear monitoring, current signal only of tool wear should be extracted from other parameters to avoid exhaustive analyses on signals in which all parameters are fused. In this paper, influences of force components of parameters on measured spindle current are investigated and a hybrid approach to cutting force regulation is employed for tool wear signal extraction in the spindle current. Finally, wear levels are verified with experimental results by means of real-time feedrate aspects changed to regulate the force component of tool wear.

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고속 밀링 주축용 자기베어링 시스템의 디지털 제어기 설계 (Digital Controller Design of a Magnetic Bearing System for High Speed Milling Spindle)

  • 노승국;경진호;박종권
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 춘계학술대회 논문집
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    • pp.398-403
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    • 2004
  • The demand of high speed machining is increasing because the high speed cutting providers high efficiency of process, short process time, improved metal removal capacity and better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting. The automatic control concept of magnetic bearing system provides ability of intelligent control of spindle system to increase accuracy and flexibility by means of adaptive vibration control. This paper describes a design and development of a milling spindle system which includes built-in motor with power 5.5㎾ and maximum speed 70,000rpm, HSK-32C tool holer and active magnetic bearing system. Magnetic actuators are designed for satisfying static load condition. The Performances of manufactured spindle system was examined for its static and dynamic stiffness, load capacity, and rotational accuracy. This spindle was run up to 70,000 rpm stably, which is 3.5 million DmN.

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공작기계 주축계 열적거동에 관한 연구 (A Study on the Thermal Behaviro of Machine Tool Spindle System)

  • 김종관
    • 한국생산제조학회지
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    • 제8권1호
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    • pp.28-34
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    • 1999
  • According to the development of tool material and the improvement of machinability of cutting material like aluminium alloy, the higher spindle speed is needed. However, the higher speed causes the heat generation of bearings, the deformation of spindle unit parts, and the rotational accuracy of spindle to be worse. Therefore, it is essential to analyze and control the heat generation and the thermal behavior of spindle unit in order to have higher speed and better rotational accuracy. This paper shows the analogy between the analyzation of heat generation and thermal behavior of high speed spindle system by finite element method and the test results of actual temperature rise through running test, and shows the necessity of cooling the spindle and inner ring side of bearings for the thermal balance of high speed spindle system.

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E-manufacturing을 위한 가공공정 모니터링 시스템 개발 (Cutting process monitoring system development for E-manufacturing)

  • 신봉철;윤길상;최진화;김동우;조명우
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.30-35
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    • 2003
  • Recently, with the rapid growth of information technology, many studies have been performed to implement web-based manufacturing system. Such technologies are expected to meet the need of many manufacturing industries those want to adopt E-manufacturing system for the construction of globalization, agility, digitalization to cope with the rapid changing market requirements. In this research, areal-time web-based machine tool and machining process monitoring system is developed as a first step fur implementing I-manufacturing system. In this system, main spindle motor current and feed current are measured using hall sensors. And the relationship between the cutting force and the spindle motor RMS current at various spindle rotational speed is obtained. Also, a rule-based expert system is developed in order to monitor the machining process effectively. Finally, developed system is applied to real machining process to verify the effectiveness.

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주축 변위 센서를 이용한 절삭력 측정에 관한 연구 (A Study on Cutting Force Measurement Using a Cylindrical Capacitive Spindle Sensor)

  • 김일해;장동영;한동철
    • 한국공작기계학회논문집
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    • 제11권2호
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    • pp.17-23
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    • 2002
  • A cylindrical capacitance-type spindle displacement sensor was developed and its effectiveness as a system to monitor cutting forces during hard turning was tested in this research. The sensor was installed between the face of spindle cover and the chucking element and measured pure radial motion of the spindle under the condition with presence of roundness error at measured surface. To prove the effectiveness of the developed system hard aiming tests using ceramic inserts and tool steel as workpiece were conducted. The workpiece was hardened up to 65 Rc. The variations of pure radial motion of the spindle ware measured during the cutting tests. The signals from the sensor showed the same pattern of cutting force variations from the tool dynamometer due to the progress of tool wear. As the flank wear of the ceramic tool increased both static component of cutting forces and the amount of center shift of spindle orbit increased, Results from the research showed that the developed sensor could be utilized as an effective and cheap on-line sensing device to monitor cutting conditions and tool performance in the un-manned machining center.

공작기계의 절삭공정 소비 에너지 예측기술 (Prediction of Machine Tool's Energy Consumption during the Cutting Process)

  • 이찬홍;황주호;허세곤
    • 한국정밀공학회지
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    • 제32권4호
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    • pp.329-337
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    • 2015
  • In this paper, a simulation based estimation method of energy consumption of the spindle and feed drives for the NC machine tool during the cutting process is proposed. To predict energy consumption of the feed drive system, position, velocity, acceleration and jerk of the table are analyzed based on NC data and then the power and energy are calculated considering friction force and mass of the stages. Energy consumption of the spindle is estimated based on models from acceleration motion of rotating parts, friction torque and power loss of motors. Moreover, simulation models of cutting power and energy for the material removal along the NC tool paths are proposed.

공작기계 주축 시스템의 유한요소해석 자동화를 위한 툴 개발 (Development of a tool to automate finite element analysis of a spindle system of machine tools)

  • 최진우
    • 한국산학기술학회논문지
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    • 제16권4호
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    • pp.2350-2355
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    • 2015
  • 본 연구에서는 축과 베어링으로 구성된 공작기계 주축 설계를 위한 1차원 유한요소 해석을 자동화하기 위한 툴을 개발하였습니다. 객체지향 프로그래밍을 기반으로 하기 때문에, CAD 시스템의 객체를 사용할 수 있습니다. 스핀들 시스템을 정의하기 위한 축의 단면과 베어링 강성과 같은 최소한의 데이터를 입력할 필요가 있으며, 그 데이터를 기반으로 형상 모델을 먼저 만들고, 그리고, 1차원 빔과 스프링 요소로 구성된 유한요소 모델로 변환합니다. 본 툴을 위해서 개발된 사용자 인터페이스는 사용자가 툴과 상호교류할 수 있도록 도와줍니다. 본 툴은 다수의 설계 변경과 그 후에 수행되는 유한요소해석 과정을 자동화함으로써 최소한의 시간과 노력으로 공작기계 주축 시스템의 근사 최적 설계를 발견할 수 있도록 해줍니다.

고속주축의 드로우바 지지조건에 따른 동특성 해석 (Analysis of Dynamic Characteristics of A High-speed Milling Spindle Due to Support Stiffness of Drawbar)

  • 노승국;박종권;경진호
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 춘계학술대회 논문집
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    • pp.484-487
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    • 2003
  • In designing AMBs (active magnetic bearings) for high-speed spindle system, the shaft is usually assumed as a rigid rotor. For automatic tool change process, there should be a tool clamping system with drawbar using spring or hydraulic force, and the drawbar in the spindle can be in various condition of support during design and manufacturing error. In this paper, the modal characteristics of drawbar in high-speed milling spindle system due to supporting stiffness between drawbar and shaft are analyzed by numerical method. The result shows enough stiff supports must be provided between shaft and drawbar to prevent occurring drawbar vibration lower than the natural frequency of 1$\^$st/ bending mode of spindle.

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다축 스핀들 헤드 기반의 전용 공작기계 설계 (Design of Special-purpose Machine Tool Based on a Multi-spindle Head)

  • 맹희영;박주욱;박홍근
    • 한국생산제조학회지
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    • 제24권6호
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    • pp.675-681
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    • 2015
  • When many holes on a plane are machined simultaneously, the positional precision and machining efficiency are very important. Multi-spindle heads are typical order making products of which the number of shafts and hole positions vary depending on the size or form of the product. For the automatic design of multi-spindle heads, the design modules for power transmission systems for drive, idle, and spindle shafts were developed, and a design technique the determining the optimum position and number of idle shafts according to gear positions was developed. In addition, for the precise determination of the multi-spindle head, the design methods for the guide planes of columns, and feed mechanisms were devised. In addition, the design modules for accurate clamping and automatic transportation mechanisms were developed. Finally, in order to simplify and standardize the design process, the design analysis and simulation verification modules are integrated.

주축 모터 출력 특성에 근거한 무인 선삭 가공 기술 (An Unmanned Turning Process Technique Based on Spindle Motor Power Characteristics)

  • 박장호;허건수
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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    • pp.8-13
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    • 2001
  • In the turning process, the feed is usually selected by a machining operator considering workpiece, cutting tool and depth of cut. Even if this selection can avoid power saturation or tool breakage, it is usually conservative compared to the capacity of the machine tools and can reduce the productivity significantly. This paper proposes a selection method of the feed and the reference cutting force based on MRR(material removal rate), maximum spindle power and specific energy. In order to estimate and control cutting force accurately in transient and steady state, this study utilizes a synthesized cutting force estimation method and a Fuzzy controller. The experimental results present that these systems can be useful for the FMS(flexible manufacturing system) and unmanned automation system.

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