서지주요정보
CNC 공작기계를 위한 실시간 3차원 보간기에 관한 연구 = A study on the real-time 3-dimensional interpolator for CNC machine tools
서명 / 저자 CNC 공작기계를 위한 실시간 3차원 보간기에 관한 연구 = A study on the real-time 3-dimensional interpolator for CNC machine tools / 홍원표.
발행사항 [대전 : 한국과학기술원, 2001].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8012242

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 01020

휴대폰 전송

도서상태

이용가능

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반납예정일

리뷰정보

초록정보

Since the arrival of NC (Numerical Control), machining of curved surfaces has been a challenging task due to the increasing demands on precision and productivity. The motion commands such as the NC part program are realized by a sequence of very small step movements along the machine axes. In general, this step movement is on the order of micrometers and it means the machine resolution. CNC (Computerized Numerical Control) interpolators process the motion commands in order to generate the reference commands for the driving of the CNC machine tools. Nowadays most CAD (Computer-Aided Design) systems provide the tools for defining 2D and 3D sculptured surfaces. In contrast, CNC machines basically support only the functions of straight line and circular interpolations. Thus the curve/surface has to be machined as a collection of linear or circular segments within the specified tolerance requirements. There are several problems with this process. The only solution to this problem in the past is either to make the segments longer by making the tolerance value large, sacrificing the accuracy of the part, or to slow down the feedrate, reducing the productivity of the machine. This thesis presents the real-time 3D interpolators for CNC machine tools in reference-pulse technique. To achieve the basic motions of 3D straight lines and circular arcs, linear and circular interpolation algorithms are proposed. And for the machining of 3D free-form surfaces, NURBS interpolation algorithm is designed. 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 can be defined as the intersection of two planes, and a 3D circle can be defined as the intersection of a plane and the surface of a sphere. Based on these intersection criteria, interpolation algorithms are designed to follow intersection curves in searching for the minimum path error strategy. To obtain other 3D curves including free-form curves, 3D NURBS interpolation algorithm is proposed. Based on the searching for minimum path error strategy, a high-precision 3D NURBS interpolation is achieved. From this, the post processing to generate the large segmented part program is no longer required, and many of the problems associated with processing linear or circular segments are eliminated. Real-Time 3D interpolator for the machining of straight lines, circular arcs and free-form curves is developed in software based on the presented interpolation algorithm. And this interpolator is implemented in the framework of a 3-axis PC-NC milling machine. The simulations of the proposed 3D interpolation algorithms have shown that the interpolation error does not exceed the machine tool resolution with reasonable machining speed for most of today’s manufacturing systems. And the implementations on the PC-NC milling machine proved the effectiveness of the presented 3D interpolator for the high-precision machining of all kinds of 3D surfaces. It is expected that presented real-time 3D interpolator can be applied to the CNC systems for the high-precision machining.

서지기타정보

서지기타정보
청구기호 {DME 01020
형태사항 vii, 110 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Won-Pyo Hong
지도교수의 한글표기 : 양민양
지도교수의 영문표기 : Min-Yang Yang
수록잡지명 : "A PC-NC milling machine with new simultaneous 3-Axis control algorithm". International journal of machine tools and manufacture, v.41 no.4, pp.555-566 (2001)
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 103-110
주제 보간기
직선 보간
원호 보간
NURBS 보간
interpolator
linear
circular
NURBS
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