• 제목/요약/키워드: Automatic cutting

검색결과 234건 처리시간 0.029초

자유곡면의 NC 황삭가공을 위한 자동 공구 선정과 경로 생성 (Automatic Tool Selection and Path Generation for NC Rough Cutting of Sculptured Surface)

  • 홍성의;이건우
    • 한국정밀공학회지
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    • 제11권6호
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    • pp.28-41
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    • 1994
  • An efficient algorithm is proposed to select the proper tools and generate their paths for NC rough cutting of dies and molds with sculptured surfaces. Even though a milling process consists of roughing, semi-finishing, and finishing, most material is removed by a rough cutting process. Therfore it can be said that the rough cutting process occupy an important portion of the NC milling process, and accordingly, an efficient rough cutting method contributes to an efficient milling process. In order work, the following basic assumption is accepted for the efficient machining. That is, to machine a region bounded by a profile, larger tools should be used in the far inside and the region adjacent to relatively simple portion of the boundary while smaller tools are used in the regions adjacent to the relatively complex protion. Thus the tools are selected based on the complexity of the boundary profile adjacent to the region to be machined. An index called cutting path ratio is proposed in this work as a measure of the relative complexity of the profile with respect to a tool diameter. Once the tools are selected, their tool paths are calculated starting from the largest to the smallest tool.

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선박 및 해양 플랜트용 H-빔 절단을 위한 3차원 형상 모델링 구현 시스템 개발 (Development of 3D Modeling System to Display the Cutting Shape of H-Beam Used in Ships and Ocean Plants)

  • 박주용;조효제;이지훈;박지용
    • 한국해양공학회지
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    • 제25권3호
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    • pp.47-52
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    • 2011
  • 3D geometric modeling has a lot of advantages in the field of design and manufacturing. Many manufacturing processes and production lines are using 3D geometric modeling technique. These help reduce the cost and time for manufacturing. The purpose of this study is the realization of a 3D cutting shape for an H-Beam used in ships and ocean plants. The complex 3D cutting shapes could be represented by using the boolean operation of basic figures. Graphic functions with parameters were used to simply define the basic figures. The developed system can show the complex cutting shape of an H-beam simply and quickly. This system can be utilized for the automatic cutting system for an H-beam.

공리적 접근을 통한 자동 가스절단기의 개발 (Development of an Automatic Pipe-cutting Machine by Axiomatic Approach)

  • 신창호;정진태
    • 대한기계학회논문집A
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    • 제26권9호
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    • pp.1866-1873
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    • 2002
  • The pipe-cutting machine developed in this study is a portable device used to cut a steel pipe. The machine, which is attached to the steel pipe by magnetic force, is moving around the pip e using four wheels. It also works for straight cutting of a steel plate. For the higher precision and labor time reduction, the automation of a pipe-cutting process is needed. However, it is not easily achieved because of vibrations and the loss of track. It is also found that the problems of the automation arise from the coupling of the functional requirements for the pipe-cutting machine. So, it is very difficult io solve the problems by a conventional design method. To overcome the difficulties the new design process for the pipe-cutting machine is established by axiomatic approach in this paper. Based on the Independence Axiom design process, a new product is designed and manufactured. Finally, it is verified by experiments that the performance of the automatic pipe-cutting machine is improved

자석식 자동 파이프 절단기의 정속제어와 MEMS 형 가속도계를 이용한 미끄럼 측정 (Velocity Control of Magnet-Type Automatic Pipe Cutting Machine and Measurement of Slipping Using MEMS-Type Accelerometer)

  • 김국환;이성환;임성수;이순걸
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.475-478
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    • 2004
  • In this paper, a magnet-type automatic pipe cutting machine that binds itself to the surface of the pipe using magnetic force and executes unmanned cutting process is proposed. During pipe cutting process when the machine moves around the pipe laid vertical to the gravitational field, the gravity acting on the pipe cutting machine widely varies as the position of the machine varies. That is, with same driving force from the driving motor the cutting machine moves faster when it climbs down the surface of the pipe and moves slower when it climbs up to the top of the pipe. To maintain a constant velocity of the pipe cutting machine and improve the cutting quality, the authors adopted a conventional PID controller with a feedforward effort designed based on the encoder measurement of the driving motor. It is, however, impossible for the encoder at the motor to measure the absolute position and consequently the absolute velocity of the cutting machine in the case where the slip between the surface of the pipe and wheel of the cutting machine is not negligible. As an attempt to obtain a better estimation of the absolution angular position/velocity of the machine the authors proposes the use of the MEMS-type accelerometer which can measure static acceleration as well as dynamic acceleration. The estimated angular velocity of the cutting machine using the MEMS-type accelerometer measurement is experimentally obtained and it indicates the significant slipping of the machine during the cutting process.

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B-Rep 솔리드모델을 이용한 머시닝센터용 CAD/CAM시스템 개발(II)(솔리드모델을 이용한 3차원 CNC가공계획에 관한 연구) (Development of smart CAD/CAM System for Machining Center Based on B-Rep Solid Modeling Techniques(ll) (A study on the 3-D CNC Cutting Planning Method Using Solid Model))

  • 양희구;김석일
    • 한국정밀공학회지
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    • 제13권3호
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    • pp.158-164
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    • 1996
  • In this paper, the CNC cutting planning module for product with three dimensional solid shape is realized to develop a smart CAD/CAM system which performs systematically from the shape design of procuct by the B-Rep solid modeler to the CNC cutting of product by a machining center. The three dimensional solid shape of product can be easily designed and constructed by the Euler operators and Boolean operators of the solid modeler. And the various functions such as the automatic generation of tool path for the rough and finish cutting processes, the automatic elimination of overcut, the automatic generation of CNC code for the machining center and do on, are established. Especially, the overcut-free tool paths are obtained by splitting the CL solid which is composed of the offset surfaces of the solid shape of product.

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자동 절단과 부하 감응 제어 기술을 적용한 양날 도로절단기 개발 (Development of a Double-blades Road Cutter with Automatic Cutting and Load Sensing Control Technology)

  • 서명국;강명철;박종호;김영진
    • 드라이브 ㆍ 컨트롤
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    • 제21권1호
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    • pp.53-58
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    • 2024
  • With the recent development of intelligence and automation technologies for construction machinery, the demand for safety and efficiency of road-cutting operations has continued to increase. In response to this, a double-blade road cutter has been developed that can automatically cut roads. However, a double-blade road cutter has a load difference between the two blades due to the ground and wear conditions of the cutting blades. The difference in load between the two blades distorts the direction of travel of the cutter. In this study, a vision sensor-based driving guide technology was developed to correct the driving path of road cutters. In addition, we developed a load-sensing technology that detects blade loads in real-time and controls driving speed in the event of overload.

작업자 안전을 위한 FRP 정화조 제조의 자동화 시스템 개발 (Development of Automatic Manufacturing System of FRP Sewage Disposal Tanks for Safety)

  • 박강;한영근;박주식;강경식
    • 대한안전경영과학회지
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    • 제6권1호
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    • pp.37-47
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    • 2004
  • The processes of manufacturing FRP sewage disposal tanks are very dangerous and hazardous jobs for workers because of large size and heavy weight of the tank, toxic fiberglass dust, nasty smell, and dangerous tools such as hand-grinders. This paper introduces an automatic manufacturing system of the FRP sewage disposal tank to enhance the safety of workers. The system consists of 3 components: the FRP body rotation jig, the automatic manhole cutting machine, the automatic sanding processing machine. The safety of workers and working environment are greatly improved, because the dangerous jobs are automatized and the toxic fiberglass dust is automatically collected. Also, the productivity is greatly improved and the cost is reduced.

End Mill 가공시 공구 파손 검출에 관한 연구 (A Study on the Cutting Tool Fracture Monitoring in End Milling)

  • 채명병;맹민재;정준기
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1994년도 추계학술대회 논문집
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    • pp.26-31
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    • 1994
  • The analysis of acoustic emission signals generated during machining has been proposed as a technique for studying both the fundamentals of the cutting process and process and as a methodology for detecting tool fracture on line. In this study, AE signals detected during End Milling were applied as the experimental test to sensing tool fracture on the CNC vertical milling machine. Because automatic monitoring of the cutting condition is one of the most important technologies in machining, the in-process detection of cutting tool life including fracture has been investigated by performing experimental test.

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금형 가공의 합리화를 위한 외적 절삭조건 선정 시스템에 관한 연구 (A Study d the Optimazation the Cutting Condition Selecting System for the Rationality of Mould Manufacture)

  • 현동훈;이용성
    • 한국안전학회지
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    • 제8권4호
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    • pp.73-81
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    • 1993
  • In recent years, mould industry in machining requires to increase machining productivity and to reduce costs, To adapt this trend it is necessary to optimize machine condition, Even though many researches in this area introduced various way to set the optimal condition, still there are not enough. Therefore this research was done to select the optimal cutting condition for industry, and to develop the computer program to select the optimal cutting condition automatically. The result of this research will contribute to increase machining productivity of various mould companies with the automatic selection of optimal cutting condition.

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선삭가공에서 절삭력을 이용한 공구마멸의 감지 (Detection of Tool Wear using Cutting Force Measurement in Turning)

  • 윤재웅;이권용;이수철
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2000년도 제31회 춘계학술대회
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    • pp.68-75
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    • 2000
  • The development of flexible automation in the manufacturing industry is concerned with production activities performed by unmanned machining system. A major topic relevant to metal-cutting operations is monitoring tool wear, which affects process efficiency and product quality, and implementing automatic tool replacements. In this paper, the measurement of the cutting force components has been found to provide a method for an in-process detection of tool wear. Cutting force components are divided into static and dynamic components in this paper, and the static components of cutting force have been used to detect flank wear. To eliminate the influence of variations in cutting conditions, tools, and workpiece materials, the force modeling is performed for various cutting conditions. The normalized force disparities are defined in this paper, and the relationships between normalized disparity and flank wear are established. Finally, Artificial neural network is used to learn these relationships and detect tool wear. According to the proposed method, the static force components could provide the effective means to detect flank wear for varying cutting conditions in turning operation.

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