• 제목/요약/키워드: cutting line

검색결과 386건 처리시간 0.026초

정면밀링작업에서 절삭력을 이용한 On-Line 표면조도 감시에 관한 연구 (A Study of the on-Line Surface Roughness Monitoring using the Cutting Force in Face Milling Operation)

  • 백대균;고태조;김희술
    • 한국정밀공학회지
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    • 제14권1호
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    • pp.185-193
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    • 1997
  • This paper presents the on-line monitoring of the surface roughness in a face milling operation. The cut- ting force was used to monitor the surface roughness, since the insert run-outs not only deteriorate surface roughness but also change cutting force. AR model and band energy method were taken to extract the fea- tures from the cutting force. The features extracted from AR modelling are more accurate about the moni- toring than those from band energy method, whereas, the computing speed of the former is slow. An artifi- cal neural network discriminated the level of the surface roughness by using the features extracted via signal processing.

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가변 적층 쾌속 조형 공저 개발을 위한 발포 폴리스티렌폼의 선형 열선 절단시스템 절단 특성 및 접착강도 특성에 대한 연구 (Investigation of Cutting Characteristics of Linear Hotwire Cutting System and Bonding Characteristics of Expandable Polystyrene Foam for Variable Lamination Manufacturing(VLM) Process)

  • 안동규;이상호;양동열;신보성;이용일
    • 한국정밀공학회지
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    • 제17권12호
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    • pp.185-194
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    • 2000
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain of RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing using linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S), and to investigate characteristics of part material, cutting characteristics by using linear hotwire cutting system and bonding. Experiments were carried out to investigate mechanical properties of part material such as anisotropy and directional tensile strength. In order to obtain optimal dimensional accuracy, surface roughness, and reduced cutting time, addition experiments were performed to find the relationship between cutting speed and cutting offset of hotwire, and heat generation of hotwire per unit length. So, adhesion strength tests according to ASTM test procedure showed that delamination did not occur at bonded area. Based on the data, a clover-shape was fabricated using unit shape part(USP) it is generated hotwire cutting. The results of present study have been reflected on the enhancement of the VLM-S process and apparatus.

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임펠러의 효율적인 5축 NC 황삭가공에 관한 연구 (A Study on Efficient Roughing of Impeller with 5-Axis NC Machine)

  • 조환영;장동규;이희관;양균의
    • 대한기계학회논문집A
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    • 제27권11호
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    • pp.1917-1924
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    • 2003
  • This paper proposes a roughing path generation method fer machining impeller with 5-axis machining center. Traditional researches are focus on finishing for machining impeller. To achieve efficient machining, roughing method must be studied. The proposed method consists two steps : One is to select optimal tool size and tool attitude by dividing cutting area into two regions to reduce cutting time. The regions are automatically divided by character point on the geometry of impeller blade. After dividing, the tool of the optimal size is selected for each divided region. The other is avoidance of tool interference. Tool interference in cutting areas is avoided by checking the distance between tool axis vector and ruling line on blade surface or approximated plan between ruling line. Using this method, the cutting time is reduced efficiently.

고속 밀링 가공 시 주축 변위 측정을 통한 절삭력의 실시간 감시 (On-line Cutting Force Estimation by N[ensuring Spindle Displacement in High-Speed Milling Process)

  • 김종혁;김진현;김일해;안형준;장동영;한동철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.133-134
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    • 2006
  • A cylindrical capacitive displacement sensor (CCS) was developed and applied for monitoring end milling processes. Dynamic characteristics of a spindle-assembly were measured using the CCS and a designed magnetic exciter. The technique to extract the spindle displacement component caused only by cutting from the measured signals using the CCS was proposed in the paper. Using CCS signals and FRF (Frequency Response Function) derived from dynamics of the spindle tool system, dynamic cutting forces are estimated quantitatively.

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생선 가공 자동화 시스템을 위한 RANSAC 기반 지느러미 절단선 검출 기법 (Fin Cutting Line Detection Technique based on RANSAC for Fish Cutting Automation System)

  • 장용훈;박창현
    • 정보과학회 논문지
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    • 제43권3호
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    • pp.346-352
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    • 2016
  • 어업에서는 분류와 가공작업에 많은 작업자가 필요할 뿐만아니라 실제 현장의 작업들이 대부분 수작업으로 진행되고 있다. 이러한 이유로 작업량과 안정성의 향상을 위해 작업장에서는 자동화 시스템이 필요하다. 본 논문에서는 지느러미 절단 자동화 시스템을 위해서 RANSAC(RANdom SAmple Consensus) 기반 지느러미 절단선 검출 기법을 제안한다. 지느러미 절단선 검출을 위해 먼저 하이패스필터(high pass filter)를 이용하여 윤곽선을 검출한 뒤 잡음필터의 파라미터와 임계값을 조절하여 몸통과 지느러미의 경계를 검출한다. 그리고 RANSAC을 이용해 최적의 지느러미 절단선을 검출한다. 제안한 기법으로 가자미 50여 마리의 샘플에 대해서 실험한 결과 약 90%의 절단선 검출 정확도를 보였다.

CNC 선반에서의 절삭력 감지 시스템 개발 (Development of a Cutting Force Monitoring System for a CNC Lathe)

  • 허건수;이강규;김재옥
    • 한국정밀공학회지
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    • 제16권1호통권94호
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    • pp.219-225
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    • 1999
  • Monitoring of the cutting force signals in cutting process has been well emphasized in machine tool communities. Although the cutting force can be directly measured by a tool dynamometer, this method is not always feasible because of high cost and limitations in setup. In this paper an indirect cutting force monitoring system is developed so that the cutting force in turning process is estimated based on a AC spindle drive model. This monitoring system considers the cutting force as a disturbance input to the spindle drive and estimates the cutting force based on the inverse dynamic model. The inverse dynamic model represents the dynamic relation between the cutting force, the motor torque and the motor power. The proposed monitoring system is realized on a CNC lathe and its estimation performance is evaluated experimentally.

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다층박판재료의 초고압 젯 정밀가공에 대한 실험적 연구 (Experimental Investigations into the Precision Cutting of High-pressured Jet for Thin Multi-layered Material)

  • 박강수;박연경;이정한;이채문;고정상;신보성
    • 한국정밀공학회지
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    • 제26권7호
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    • pp.44-50
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    • 2009
  • High-pressured jetting is now widely used in the advanced cutting processes of polymers, metals, glass, ceramics and composite materials because of some advantages such as heatless and non-contacting cutting. Similarly to the focused laser beam machining, it is well known as a type of high-density energy processes. High-pressured jetting is going to be developed not only to minimize the cutting line width but also to achieve the short cutting time as soon as possible. However, the interaction behavior between a work piece and high-velocity abrasive particles during the high-pressured jet cutting makes the impact mechanism even more complicated. Conventional high-pressured jetting is still difficult to apply to precision cutting of micro-scaled thin work piece such as thin metal sheets, thin ceramic substrates, thin glass plates and TMM (Thin multi-layered materials). In this paper, we proposed the advanced high-pressured jetting technology by introducing a new abrasives supplying method and investigated the optimal process conditions of the cutting pressure, the cutting velocity and SOD (Standoff distance).

모델에 근거한 선삭력 모니터링 (Model-Based Monitoring of the Turning Force)

  • 허건수
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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    • pp.11-15
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    • 1999
  • Monitoring of the cutting force signals in cutting process has been well emphasized in machine tool communities. Although the cutting force can be directly measured by a tool dynamometer, this method is not always feasible because of high cost and limitations in setup. In this paper an indirect cutting force monitoring system is developed so that the cutting force in turning process is estimated based on a AC spindle drive model. This monitoring system considers the cutting force as a disturbance input to the spindle drive and estimates the cutting force based on the inverse dynamic model. The inverse dynamic model represents the dynamic relation between the cutting force, the motor torque and the motor power. The proposed monitoring system is realized on a CNC lathe and its estimation performance is evaluated experimentally.

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양식 문서 영상에서 도표 구조 분석을 위한 라인 추적 알고리즘 (Line Tracking Algorithm for Table Structure Analysis in Form Document Image)

  • 김계경
    • 한국소프트웨어감정평가학회 논문지
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    • 제17권2호
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    • pp.151-159
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    • 2021
  • 도표로 작성된 양식 문서에서 도표의 레이아웃 해석에 필요한 그리드 라인을 추출하기 위해 다양한 필터링 또는 모폴로지 등의 방법을 사용하여 직선 성분을 선명하게 개선시키기 위한 연구들이 많이 진행되고 있다. 도표의 직선 성분을 선명화하더라도 직선 내부에 절단 점들이 존재하거나 기울어진 경우에는 직선 추출이 어렵고 도표 셀들의 레이아웃을 논리적으로 표현하는데 여전히 어려움을 겪을 수 있다. 본 연구에서는 직선에 절단점들이 존재하거나 기울어져도 직선을 검출할 수 있는 라인 추적 알고리즘을 제안하였다. 이를 이용하여 그리드 라인을 추출하고 라인들의 교차점 및 셀 정보들을 찾아 도표의 구조를 분석할 수 있는 알고리즘을 마련하였다. 제안한 알고리즘을 실제 양식 문서 영상을 대상으로 실험한 결과 평균 0.41초 처리시간에 96.4%의 도표 구조를 분석할 수 있음을 확인하였다.

볼엔드밀 절삭공정의 절삭력 디지털 제어

  • 이천환;이건복
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1992년도 추계학술대회 논문집
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    • pp.198-203
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    • 1992
  • There are two important variables in machining process control, which are feed and cutting speed. It is possible to improve the machining accuracy and the productivity by maintaining the optimal feed and cutting speed. IN this work, a controller is designed to achieve on-line cutting force control based on the modeling of cutting process dynamics established through step response test. Two schemes are proposed and implemented. The first is feed control under the constant spindle speed and the second is spindle speed control under the constant feed. Finally, both are proved to work properly through simulation and experimentation.