Skin crushed surface reconstruction method based on characteristics
A broken surface and skinning technology, which is applied in the field of CNC machining, can solve the problems of unstable machining process, cumbersome machining operations, and long processing time, and achieve the effects of stable machining process, improved machining efficiency, and increased automation
Active Publication Date: 2015-03-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0006] The purpose of the present invention is to aim at the incomplete and discontinuous tool paths generated due to the locality of the scribed lines caused by the large number of broken surfaces when modeling in the existing skin numerical control machining process, the machining process is unstable, and the machining operation cumbersome, long processing time, low efficiency and a series of problems, invent a feature-based skin fragment reconstruction method
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0040] like figure 1 shown.
[0041] A feature-based skin fragment reconstruction method, comprising the following steps:
[0042] Step 1. Select one or more surfaces from the broken surface to be constructed as the process surface and input relevant parameters;
[0043] Step 2. Search for surfaces adjacent to the process surface according to the process surface, and calculate the edge angle A1, which is the angle between the two lines obtained by drawing a straight line in the two intersecting surfaces and intersecting at the same point on the intersection line. The face angle F1 is the angle between the normal vectors of the center points of the two intersecting faces. If the side angle satisfies the condition: A1≈0° or A1≈180°, and the face angle satisfies the condition: F1≈0° or F1≈180°, then search If the surface adjacent to the adjacent surface...
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The invention discloses a skin crushed surface reconstruction method based on characteristics. The method comprises the steps that searching is performed firstly according to the selected technological curved surfaces so that a combined curved surface is acquired; then external contour line of the combined curved surface is extracted and fitting is performed the contour line; a guide line is automatically established according to the complete contour line, and the curved surface is formed via fitting; and whether the curved surface meets the precision requirement is judged, and the curved surface is expanded and extended if the curved surface meets the precision requirement and an expansion surface is established. If precision cannot meet the requirement, precision is doubled and the expansion surface is established again. The expansion surface is cut by the complete contour line, and the maintained curved surface is the reconstructed curved surface. The complete curved surface completely overlapped with the original technological curved surface is reconstructed by the method by aiming at the skin component crushed curved surface, and the complete fitting boundary is obtained so that fitting precision is high, skin mirror image milling numerical control programming can be directly used, processing time is saved, processing efficiency is enhanced and the processing process is enabled to be more stable.
Description
technical field [0001] The invention relates to a numerical control processing technology, in particular to a skin fragment reconstruction technology, in particular to a feature-based skin fragment reconstruction method. Background technique [0002] Aircraft skin parts generally have the characteristics of relatively large size, complex shape, and most of them are hyperbolic. Therefore, in the process of modeling, a curved surface will be composed of multiple irregular broken surfaces, which will cause scratches. Locality leads to incomplete and discontinuous tool paths, instability during processing, cumbersome processing operations, long processing time and low efficiency. [0003] After consulting the existing technology and literature, it is found that the patent (patent number 201310428984.9) applied by Shenyang Aircraft Industry (Group) Co., Ltd. proposes a method for converting finely divided curved surfaces of aircraft structural parts into ruled surfaces, but this ...
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IPC IPC(8): G05B19/18
CPCG05B19/18
Inventor 李迎光郝小忠徐明李响周冠妍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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