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Vol. 177, Issue 8, August 2014, pp. 46-53




Research of Cubic Bezier Curve NC Interpolation Signal Generator

Shijun Ji, Xiaolong Liu, * Ji Zhao, Huijuan Yu, Hong Gao

College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China
Tel.: 13074323390, fax: 0431-85095428

* E-mail: jzhao@jlu.edu.cn


Received: 3 April 2014 /Accepted: 31 July 2014 /Published: 31 August 2014

Digital Sensors and Sensor Sysstems


Abstract: Interpolation technology is the core of the computer numerical control (CNC) system, and the precision and stability of the interpolation algorithm directly affect the machining precision and speed of CNC system. Most of the existing numerical control interpolation technology can only achieve circular arc interpolation, linear interpolation or parabola interpolation, but for the numerical control (NC) machining of parts with complicated surface, it needs to establish the mathematical model and generate the curved line and curved surface outline of parts and then discrete the generated parts outline into a large amount of straight line or arc to carry on the processing, which creates the complex program and a large amount of code, so it inevitably introduce into the approximation error. All these factors affect the machining accuracy, surface roughness and machining efficiency. The stepless interpolation of cubic Bezier curve controlled by analog signal is studied in this paper, the tool motion trajectory of Bezier curve can be directly planned out in CNC system by adjusting control points, and then these data were put into the control motor which can complete the precise feeding of Bezier curve. This method realized the improvement of CNC trajectory controlled ability from the simple linear and circular arc to the complex project curve, and it provides a new way for economy realizing the curve surface parts with high quality and high efficiency machining.


Keywords: Bezier curve interpolation, Bezier curve, Signal generator, Stepless interpolation, CNC.


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