• 제목/요약/키워드: End-milling system

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볼엔드밀을 이용한 고속가공에서 가공경로와 가공환경에 따른 가공성 평가 (Evaluation of Machinability by various cutting conditions in high machining using ball nose-end mills -Effects of cutting orientation and cutting environments-)

  • 이채문;김석원;이득우
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 추계학술대회 논문집
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    • pp.297-301
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    • 2002
  • High-speed machining generates concenter thermal/frictional damage at the cutting ed rapidly decreases the tool life. This paper I at determining the effect of cutter orienter the cutting environment on tool life, tool mechanism when down milling. In this paper, experiments were carried out in various tool and cutting environments, such as dry, wet compressed chilled air, tool life were measu evaluate machinability in high-speed milli difficult-to-cut material and die steel, Tool measured in horizontal upwards, horiz downwards, vertical upwards and vert downwards. In addition, tool life was measur dry, wet and compressed chilled air. For this a compressed chi1led-air system was manufact The results show that a horizontal cutter ori provided a longer tool life than a vertical orientation. With respect to the cutting envi compressed chilled air increased tool life. H the wet condition decreased tool life due thermal shock caused by excessive cooling high-speed mill ins and the compressed chilled had little effect.

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방전과 엔드밀링이 결합된 하이브리드 공정의 가공특성 (Machining Characteristics of the Hybrid Machining System Comprising of EDM and Endmilling)

  • 김민엽;이상평;김정현;고태조
    • 한국기계가공학회지
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    • 제15권3호
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    • pp.86-92
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    • 2016
  • Mechanical milling, in association with electrical discharge machining (EDM) for hybrid machining, is presented in this paper. An end mill cutting tool, an electrode of the EDM, was used for the system. That means that some parts were cut by the mechanical cutting process and others by the EDM. The possibility of combining both processes was simulated with the cutting simulation software. In addition, the machining reality was verified by measuring the electrical signal from the EDM power supply, which was measured in time and frequency domains. From this initial research, the hybrid machining system proposed in this paper appears to be well suited for difficult to cut material processing.

커터 런 아웃과 가공표면 생성에 관한 연구 (A Study on the Charactistics of Machined Surface due to Cutter Runout)

  • 황준;이기용;신승춘;정의식
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.873-877
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    • 1997
  • This paper presents experimental results to know the charcteristics of machined surface due to cutter runout. Cutter runout is a common but undesirable phenomenon in multi-tooth machining such as end-milling process because it introduces variable chip loading to insert which results in a accelerated tool wear, amplification of force variation and hence enargement vibration amplitude. To develop in-proess cutter runout compensation system, set-up the micro-positoning mechanism which is based on piezoelectric translator embeded in the work holder to manipulate the depth of cut in real-time. And feasibility test of system was done under the various experimental cutting conditions. This results provide lots of information to build-up the precision machining technology.

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볼엔드밀 가공시 공구경로가 Cusp의 크기에 미치는 영향 (The Effect of Tool Path on the Cusp Height in Ball End Milling of Cylinderical Surface)

  • 윤희중;박상량;박경호;박동삼
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.944-947
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    • 2000
  • Sculptured surface machining plays a vital role in the process of bring new products to the market place. A great variety of products rely on this technology for the production of the dies and moulds used in manufacturing. And, the use of CNC machines and CAD/CAM system has become a vital parts of product development process. The propose of this study is to investigate the effect of cutting parameters on the machinability such as surface roughness and cusp generated in the machining of sculptured surface on a three-axis CNC machining center using the CAD/CAM system. Experimental result showed that: In step down cutting, as the inclined angle of surface became smaller, the cusp height appeared higher. On the other hand, in step over cutting, as the inclined angle of surface became larger, the cusp height appeared higher. In the point of precision machining, step over cutting was more effective. For the minimization of cusp height, step down cutting was effective in larger inclined surface, but step over cutting in smaller inclined surface.

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Machining Center에서 End Millirh할 때 Torgue에 의한 가공변수의 적응제어에 관한 연구 (A study on the adaptive control of process parameters using torque for end milling operation in machining center)

  • 박천령;윤문철
    • 대한기계학회논문집
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    • 제10권6호
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    • pp.889-897
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    • 1986
  • 본 논문에서는 Koren의 알고리즘을 밀링에 적용하는 ACCCNC시스템을 제안 CNC 시스템에 AC 시스템을 적용할 때 생기는 변수예측과 또 스텝 및 테이퍼의 두 가지 형 상모델에 대한 변수들의 거동 및 그 때의 생산성을 알아보고 또 이 시스템을 밀링에 적용할 때의 이들 시스템의 적용 가능성을 AC-unit 제어실험(control test)을 통하여 그 타당성을 검토하여 실제 CNC 시스템에 AC 시스템을 적용할 수 있도록 하는 ACC-CNC 시스템의 설계기준을 설정하여 시스템의 최적설계의 기초적인 자료를 얻고자 한다.

가상 측정을 통한 펜슬곡선 추출 (Pencil Curve Tracing via Virtual Digitizing)

  • 박정환;김보현;최병규
    • 한국CDE학회논문집
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    • 제2권4호
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    • pp.253-266
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    • 1997
  • Pencil-curve machining, which is a single-pass ball-end milling along a concave edge on adie surface, is widely employed in die-surface machining. The cutter-path used for pencil-curve machining, which is the trajectory of the “ball-center point” of a ball-endmill sliding along a concave-edge region on the die surface, is called pencil-curve. Presented in the paper is a pencil-curve tracing algorithm in which “concave-type” sharp edges are computed from a “virtually digitized” model of the tool-envelope surface. The resulting “initial” pencil-cures are then refuted by applying a series of fairing operations. illustrative examples and methods for enhancing accuracy are also presented. The proposed pencil-curve tracing algorithm has been successfully implemented in a commercial CAM system specialized in die-machining and in the CAD/CAM system CATIA.

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반복학습제어를 이용한 커터 런아웃 보상에 관한 연구 (A Study on the Cutter Runout In-Process Compensation Using Repetitive Loaming Control)

  • 황준;정의식;황덕철
    • 한국정밀공학회지
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    • 제19권3호
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    • pp.137-143
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    • 2002
  • This paper presents the In-process compensation to control cutter runout and improve the machined surface quality. Cutter runout compensation system consists of the micro-positioning servo system with piezoelectric actuator which is embeded in the sliding table to manipulate radial depth of cut in real-time. Cutting force feedback control was proposed in the angle domain based upon repetitive learning control strategy to eliminate chip load variation in end milling process. Micro-positioning control due to adaptive actuation force response improves the machined surface quality by compensation runout effect induced cutting force variation. This result will provide lots of information to build-up the preciswion machining technology.

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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볼 엔드밀을 이용한 금형 구면 가공의 표면품질 향상에 관한 연구 (Surface Quality Improvements on the Spherical Shaped Mold using Ball End Milling)

  • 윤일우;황종대
    • 한국기계가공학회지
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    • 제19권3호
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    • pp.71-76
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    • 2020
  • Various machining methods are being studied to improve the processing quality of the spherical R shape in press die. In this paper, we confirmed that changes in machining quality were associated with changes in cutting direction, path, and cutting angle, which are commonly used in the machining of molds. We obtained a surface roughness graph with each condition change in one specimen using an instrument that measured geometry and surface roughness simultaneously. The results of the study showed that the best surface roughness in the finish cut of the spherical surface was obtained using upward pick feed machining.

In-Process Cutter Runout Compensation Using Repetitive Learning Control

  • Joon Hwang;Chung, Eui-Sik
    • International Journal of Precision Engineering and Manufacturing
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    • 제4권4호
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    • pp.13-18
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    • 2003
  • This paper presents the in-process compensation to control cutter ronout and to improve the machined surface quality. Cutter ronout compensation system consists of the micro-positioning servo system with piezoelectric actuator which is embeded in the sliding table to manipulate radial depth of cut in real-time. Cutting force feedback control was proposed in the angle domain based upon repetitive learning control strategy to eliminate chip load variation in end milling process. Micro-positioning control due to adaptive actuation force response improves the machined surface quality by cutter ronout compensation.