• 제목/요약/키워드: 기준 펄스 보간기

검색결과 9건 처리시간 0.027초

소프트웨어 펄스보간기의 성능비교에 관한 연구

  • 안중환;임현석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1992년도 춘계학술대회 논문집
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    • pp.211-215
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    • 1992
  • 보간기(Interpolator)는 NC 공작기계에서 공구의 궤적 및 이송속도를 제어하는 주요한 요소이다. 보간기는 보간계산 과 펄스의 발생을 전자회로로서 행하는 하드웨어 보간기와 컴퓨터 프로그램으로 수행하는 소프트웨어 보간기로 나눌 수 있는데 하드웨어 보간기는 고속보간이 가능하지만, 유연성이 부족한 단점이 있기 때문에 CNC 화 뒤로는 그 의존도가 점점 낮아지고 있다. 본 연구에서는 더 광범위한 기준펄스 보간기의 특성을 조사하기 위하여 DDA, SPD(Smooth Pulse Distribution), SFG(Saita Function Generator) 방식의 직선, 원호, 타원보간 성능을 알고리즘의 처리속도, 경로오차의 측면에서 비교, 분석하였다.

재귀적 방법에 의한 NURBS 보간기 (NURBS Interpolator with Recursive Method)

  • 백대균;고태조;이재원;김희술
    • 한국정밀공학회지
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    • 제22권5호
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    • pp.45-54
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    • 2005
  • The purpose of this research is to find a simple and accurate NURBS interpolator for CNC systems such as robot, CMM and CNC machine tools. This paper presents a new design of NURBS interpolator for CNC system. The proposed algorithm used the recursive characteristics of NURBS equation, the previous incremental value and chord length for the sake of a constant chord length. Simulation study was conducted to see the performance of the proposed interpolator with reference-word and reference-pulse method. Consequently, an accurate and simple NURBS interpolator was possible for modem CNC systems.

소프트웨어 펄스 보간기의 성능비교 (Study on the Performance Comparision of Software Pulse Interpolators)

  • 안중환;임현석;이원규
    • 한국정밀공학회지
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    • 제13권9호
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    • pp.62-69
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    • 1996
  • Interpolator is a very important element in NC machines in that it controls tool path and speed. In this paper, studied were extensive interpolation characteristics of reference pulse method among various interpolation and pulse generation methods. Specifically, processing speed and path error of DDA, SPD and SFG methods were compared and analyzed against line, circle and elipse. As a result, in the point of processing speed, SPD method was found to be the best for line interpolation, SFG method for circle and ellipse, and DDA method was found to be the slowest for all paths. In the point of path error, DDA method was found to have the biggest error for all kinds of paths.

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CNC 공작기계의 실시간 3차원 NURBS 보간기 개발 (Development of the Real-Time 3D NURBS Interpolator for CNC Machines)

  • 홍원표;양민양
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.1032-1035
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    • 2000
  • Increasing demands on precision machining with computerized numerical control (CNC) machines have necessitated that the tool to move not only position error as small as possible, but also with smoothly varying feedrates in space. This paper presents a new high precision interpolation algorithm for 3-dimensional (3D) Non-Uniform Rational B-Spline (NURBS) curve in the reference-pulse CNC technique. Based on the minimum path error strategy, real-time NURBS interpolator was developed in software and this was implemented with a PC-NC milling machine. The several experimental results have shown that the proposed NURBS interpolator is useful for the high precision machining of complex shapes. It is expected that this algorithm can be applied to the CNC machines for the machining of 3D free-form surfaces.

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CNC 공작기계의 NURBS 보간 알고리즘에 관한 연구 (NURBS Interpolation Algorithm for CNC Machines)

  • 홍원표;양민양
    • 한국정밀공학회지
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    • 제17권12호
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    • pp.115-120
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    • 2000
  • Increasing demands on precision machining of free-form surface have necessitated that the tool to move not only position error as small as possible, but also with smoothly varying feedrates. This paper presents new algorithm for high precision 3D(3-dimensional) NURBS(Non-Uniform Rational B-Spline) interpolation in the reference-pulse technique. Based o the minimum path error strategy, interpolation algorithm was designed to follow the NURBS curve. Using this algorithm a real-time 3D NURBS interpolator was developed in software. The algorithm implemented in a PC showed promising results in interpolation error and speed performance. It is expected that this can be applied to the CNC systems for the high precision machining of complex shapes.

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PC-based NC 공작기계의 소프트웨어 보간기 개발 (Development of Software Interpolators for PC-based NC Machine Tools)

  • 양민양;홍원표
    • 한국정밀공학회지
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    • 제13권12호
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    • pp.99-105
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    • 1996
  • Increasing demands on precision machining of free-form surfaces have necessitated the tool to move not only with position error as small as possible, but also with smoothly varying feedrates. In this paper, linear, circular and spline interpolators were developed in reference-pulse type using PC. M-SAM and M-DAM were designed by the comparison and analysis of previous interpolation methods. Spline interpolator was designed to follow the free-form curves. To apply to the real cutting process, constant feedrate compensation and acceleration-deceleration compensation were conceived. Finally, its performance was tested using retrofitted milling machine. As a result, new interpolation algorithm is favorable in precision machining of free-form curves.

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실시간 NURBS 보간에 의한 동시 3차원 가공에 관한 연구 (Simultaneous 3D Machining with Real-Time NURBS Interpolation)

  • 홍원표;양민양;이응기
    • 한국정밀공학회지
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    • 제19권5호
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    • pp.89-94
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    • 2002
  • Increasing demands on precision machining using CNC machines have necessitated that the tool to move with a position error as small as possible in 3-dimensional (3D) space. This paper presents the simultaneous 3D machining with a retrofitted PC-NC milling machine. To achieve the simultaneous 3-axis motions, a new precision interpolation algorithm for 3D Non-Uniform Rational B-Spline(NURBS) curve is used. With this accurate and efficient algorithm for the generation of complex. 3D shapes, a real-time NURBS interpolator was developed using a PC and the simultaneous 3D machining is accomplished.

CNC 공작기계의 3차원 직선 및 원호 보간 알고리즘에 관한 연구 (3D Linear and Circular Interpolation Algorithm for CNC Machines)

  • 양민양;홍원표
    • 한국정밀공학회지
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    • 제16권9호
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    • pp.172-178
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    • 1999
  • 3D linear and circular interpolations are a basic part for the machining of complex shapes. Until now, because of the absence of appropriate algorithms for the generation of 3D lines and circles, a full accomplishment for available machine tool resolution is difficult. this paper presents new algorithms for 3D linear and circular interpolation in the reference pulse technique. In 3D space, the line or circle is not expressed as an implicit function, it is only defined as the intersection of two surfaces. A 3D line is defined as the intersection of two planes, and a 3D circle is defined as the intersection of a plane and the surface of a sphere. Based on these concepts, interpolation algorithms are designed to follow intersection curves in 3D space, and a real-time 3D linear and circular interpolator was developed in software using a PC. The algorithm implemented in a PC showed promising results in interpolation error and speed performance. It is expected that it can be applied to the next generation computerized numerical control systems for the machining of 3D lines, circles and some other complex shapes.

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컴퓨터수치제어(CNC) 플라즈마 아아크 절단장치 개발에 관한 연구 (A study on development of plasma-arc cutting system with computer-numerical control)

  • 노태정;나석주;나규환
    • Journal of Welding and Joining
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    • 제8권3호
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    • pp.60-69
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    • 1990
  • Plasma arc cutting is a fusion cutting process in which a gas-constricted arc is employed to produce a high-temperature, high-velocity plasma jet on the workpiece. This process provides some advantages such as increased cutting velocity, excellent working accuracy and the ability to cut special materials (widely used stainless steels and Al-alloys, for example), when compared with iconventional oxyfuel gas cutting. From the view point of price and reliability of the power source, plasma arc cutting has also some distinct advantages over laser beam cutting. High-speed machines with NC or CNC systems are needed for the plasma arc or laser beam cutting process, while for oxyfuel gas cutting, low-speed machines with copying templates or optical-shape tracking sensors can be applied. The low price and high flexibility of the microprocessor arc contributing more and more the application of CNC system in the plasma arc cutting process, as in other manufacturing fields. From these points of view, a microprocessor-based plasma arc cutting system was developed by using a reference-pulse system, and its performance was tested. The interpolating routines were programmed in the assembly language for saving the memory volume and improving the compouting speed, which has an intimate relationship with the available cutting velocity.

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