Knowledge-based CNC torch path generation for laser cutting of planar shapes [IJAMT 2008]| This work presents a knowledge-based method for generating a CNC torch path for laser cutting of the outlines of planar shapes. The method consists of two main phases: laser cutting knowledge construction and CNC torch path generation using the knowledge. Using the knowledge of laser cutting, the CNC torch path is generated for cutting the outlines of the given planar shapes. This is basically based on the offset generation of each outline by a sequence of arc splines, where the offset distance is the same as the half of the kerf width determined from the constructed knowledge. The proposed method based on laser cutting knowledge makes full use of arc interpolators in CNC torch path generation. The method can efficiently reduce the number of path segments while keeping the torch path within the desired accuracy. |  |
A solution for NURBS modeling in aspheric lens manufacture [IJAMT 2004b]|
Aspheric lenses are widely used as important parts of commercial optical products. Owing to their specific functionality, the aspheric surfaces of the lenses are mostly defined by highly complex functions incompatible with commercial manufacturing systems. This reduces lens data interoperability in downstream lens manufacture processes. It is necessary to represent such surfaces in standard formats such as non-uniform rational B-splines (NURBS) by approximating them without sacrificing their accuracy. This work presents a solution for improving product data interoperability in aspheric lens manufacture. According to the surface type, the solution employs appropriate methods for approximating NURBS surfaces to aspheric surfaces of each type within a specified accuracy and correspondingly provides a simple way of interfacing lens data with commercial manufacturing systems. |
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