• Title/Summary/Keyword: Multi-path CNC

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Study On Manufacturing of General Cam Using Coordinate Mapping in Multi CNC Machining Center (좌표계 맵핑을 이용한 다축 CNC 머시닝센터에서의 캠 가공에 관한 연구)

  • 박세환;신중호;장세원;강동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.999-1002
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    • 2002

  • Cylindrical Cam Mechanism is widely used in the fields of industries, such as machine tool exchangers, textile machinery. This paper proposes a method for manufacturing of cylindrical cam in Multi CNC machining center. Multi CNC machining center has two different types depending on the tilting axis. For the manufacturing procedures. in this paper the location and the orientation of cutter path are defined from shape design data of cam. The integral NC code fur the both types of multi-axis CNC machining center can be created using the coordinates mapping between design coordinates and work coordinates. Finally, CAD/CAM program is developed on $C^{＋＋}$ language. This program can display manufacturing and kinematics simulation, which can make integral NC code for multi-axis CNC machining center of two types.

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Improvement of Corner Contouring Accuracy of CNC Servo Systems with Communication Delay (통신지연을 갖는 CNC 서보 시스템에 대한 모서리 윤곽정확도 향상)

  • Lim, Jong-Hyup;Jee, Sung-Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.2
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    • pp.168-175
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    • 2011

  • Contouring accuracy of CNC machine tools is very important for high-speed and high-precision machining. In particular, large contour error may occur during corner tracking. In order to reduce the corner contouring error, acceleration and deceleration control or tool-path planning methods have been suggested. However, they do not directly control the corner contouring error. In the meantime, network servo systems are widely used because of their easiness of building and cost effectiveness. Communication latency between the master controller and servo drives, however, may deteriorate contouring accuracy especially during corner tracking. This paper proposes a control strategy that can accurately calculate and directly control the corner contouring error. A prediction control is combined with the above control to cope with communication latency. The proposed control method is evaluated through computer simulation and experiments. The results show its validity and usefulness.

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Design of Contour Error Models using Contour Error Vector (윤곽오차 벡터를 이용한 윤곽오차 모델 설계)

  • 최정희;이명훈;양승한
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.895-898
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    • 2003

  • The higher precision is demanded in modem manufacturing and it requires the more accurate servo controller. Cross-coupling control (CCC) has been developed to improve contouring motion. In this paper we introduce a new nonlinear CCC that is based on contour-error-vector using a parametric curve interpolator. A vector from the actual tool position to the nearest point on the desire path is directly adopted. The contour-error-vector is determined by constructing a tangential vector of nearest point on desired curve and determining the vector perpendicular to this tangential vector from the actual tool position. Moreover, the vector CCC can apply directly and easily to free-form curves include convex and concave form. The experimental results on a three-axis CNC machine center show that the present approach significantly improves motion accuracy in multi-axis motion

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A Multi-Axis Contour Error Controller for High-Speed/High-Precision Machining of Free form Curves (고속 고정밀의 자유곡선 가공을 위한 다축 윤곽오차 제어)

  • 이명훈;최정희;이영문;양승한
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.4
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    • pp.64-71
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    • 2004

  • The growing need for higher precision and productivity in manufacturing industry has lead to an increased interest in computer numerical control (CNC) systems. It is well known fact that the cross-coupling controller (CCC) is an effective method for contouring applications. In this paper, a multi-axis contour error controller (CEC) based on a contour error vector using parametric curve interpolator is introduced. The contour error vector is a vector from the actual tool position to the nearest point on the desired path. The contour error vector is the closest error model to the contour error. The simulation results show that the CEC is more accurate than the conventional CCC for a biaxial motion system. In addition, the experimental results on 3-axis motion system show that the CEC is simply applied to 3-axis motions and contouring accuracy is significantly improved.

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