| Summary: | 碩士 === 國立中正大學 === 機械系 === 87 === ABSTRACT
Due to the enormous engineering advancement in modern industries, the competition in manufacturing technologies has been increasingly intense as can be seen in automobile and aerospace industries. Not only product quality is improved tremendously, but the demand over production speed is becoming higher and higher. Therefore, high speed and high accuracy production has become the ultimate goal of modern manufacturing companies.
Thanks to the ever increasing computer speed and the open architecture of new controllers in computer-controlled machines, the capability and flexibility of today''s CNC machines allow us to machine contoured geometry using NURBS (Non-Uniform Rational B-Spline) curves directly from the free-form surfaces of a complex CAD/CAM model. As a result, machining accuracy and product quality can be greatly improved while machining time also significantly reduced.
In this thesis, we propose a post-processing approach to convert G1 NC codes from most CAD/CAM systems to NURBS NC paths for high-speed contour machining. We also develop the NURBS interpolation strategy which takes into account the optimized cutting speed based on machine dynamic response and curvature of the NURBS curve. Experiments show that the implemented NURBS cutting can tremendously improve machining accuracy and reduce cutting time and therefore satisfies the requirements of today''s high speed and high-accuracy machining needs.
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