基于SFS的浮雕數(shù)控自動編程方法研究與實現(xiàn)
[Abstract]:Relief products are widely used in furniture manufacturing, advertising decoration and other industries. With the development of numerical control technology, numerical control machining has become the main way of relief machining, in which NC programming is an important technology in the process of relief NC machining. The current mainstream NC programming needs the participation of experienced programming engineers, and most of them use CAD / CAM software to assist design. For most small and medium-sized relief processing enterprises, this way has the disadvantages of high cost and low efficiency. Therefore, these enterprises urgently need a low cost, high efficiency and self-owned NC automatic programming method to improve their market competitiveness. The automatic programming method of relief NC based on SFS in this paper can meet the needs of the above small and medium enterprises. In this method, the general NC program can be obtained by image acquisition (or input grayscale art map), pre-processing, three-dimensional reconstruction of relief and post-processing of relief NC machining, and then the relief products can be processed. In this paper, the flow design of this method is completed, and the theoretical analysis and software design of each step are carried out. Among them, three aspects are emphatically studied: pre-processing of relief image, 3D modeling and post-processing of NC programming. In the aspect of pre-processing of relief image, this paper applies the coordinate mapping principle to improve the conventional weighted grayscale method, adopts an adaptive median filter to de-noise the image, and designs the relevant software and verification. It is proved that its effect is superior to that of conventional pretreatment method. In the aspect of 3D modeling of relief sculpture, this paper analyzes the reason of applying SFS to realize 3D modeling of relief, uses Oren-nayar illumination model to describe the relation between object shape and image grayscale, and calculates and simplifies the model to get the illumination equation. Then, according to the idea of SFS linearization method, the iterative solution formula for calculating the image height is deduced. At last, the corresponding software is designed, and the 3D (2.5 dimension) reconstruction of the object is realized in the range of 180 擄. The rationality of using SFS for 3D reconstruction is proved. In terms of post-processing of NC programming, according to certain technological parameters and cutting tool type, the reciprocating walking cutter method is adopted, and the line height contour fitting of relief carving is carried out, and the NC program generating software is designed and realized according to HPGL instruction format. The NC program which can be run on the CNC engraving machine is obtained. In this paper, the real object image and grayscale art map are used as input data respectively, and the corresponding numerical control program is obtained. Finally, the relief products which are consistent with the physical contour and texture features are obtained, which have a strong sense of three-dimensional and good appreciation. Thus, the validity of the NC automatic programming method in this paper is proved.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TG659
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