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Tool Path Generation and Machining Simulation of Subdivision Surface

Author: ZhangZiXian
Tutor: RenBingYin
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: NC machining subdivision surface tool path generation simulation intervention
CLC: TG501
Type: Master's thesis
Year: 2008
Downloads: 18
Quote: 0
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Abstract


Subdivision surface can generate smooth surfaces of pretty complex arbitrary topology without cumbersome patch stitching and curve trimming. It is relatively easy to implement efficiently and inherits many nice properties of B-spline. With these elegant and practical advantages, subdivision surfaces have found their great way into wide application in computer graphics, animations and computer aided geometric design. In order to extend its use in NC machining field, this paper studied tool path generation method of subdivision surface and simulation technique.First of all, this paper gave an adjusting method for short step to restrict these steps to be consistent within the specified tolerance. The angle composed by the short step and the adjacent step was used to decide the adjusting direction. If the required length can not be obtained by just adjusting in one direction, the short step is adjusted in two opposite directions. At last, a formula is given to calculate error. It is shown in the experimental results that the proposed method is effective and can reach a high precision. After adjusting, stabilization of machining process is enhanced.Secondly, this paper gave a method to generate tool path directly from points and lines of subdivision surface. In this method, the cut location surface is obtained firstly, then the auto-fit subdivision technique is used to ensure all the lines of the cut location surface within a given path interval. The points of the divided surface are arranged in certain sequence to compose tool path. The advantage of this approach is that cut interval and step are all easy to control and there is no interpolation error.Lastly, tool path generation and intervention examination of ring-edge machining tool is realized in 5-axis milling machine. Firstly a series of parallel surface is used to cut the designed surface and the cut contact point path is obtained. Then we calculate the cut location data using the normal of the cut contact point, the direction in which the machining tool moves on the point and the geometrical relationship between the surface and the tool. After that, coordinate transform is used to facilitate the intervention examination.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > General issues > Cutting principle and calculation
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