Method for generating numerical control cutter path of top surface of flat reinforcement
A rib top surface and flat top technology is applied in the field of CNC tool path generation on the top surface of plane ribs, which can solve the problems of uneven distribution, large difference in triangle size, and large tool path skeleton error.
Pending Publication Date: 2018-11-06
SHENYANG AIRCRAFT CORP
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Problems solved by technology
Tang Yunlong et al. directly extract the approximate skeleton from the constrained Delaunay triangular mesh to generate the top surface toolpath of the flat top rib (Tang Yunlong. Automatic generation method of the tool path for flat top surface processing of aircraft structural parts: China, CN103034167B[P].2013-04 -10.), this method takes advantage of the advantages of Delaunay triangulation in area decomposition, but when the top surface of the flat top rib is an irregular connected domain, due to the large difference in the size of the triangles in the triangular mesh and the uneven distribution , the error between the generated tool path and the theoretical skeleton is large, resulting in a residual area and the tool path has C 1 discontinuity point
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[0036] The invention is based on the CAD / CAM system platform, and realizes a method for generating the tool track on the top surface of the flat top rib of the aircraft structural part based on the structured skeleton.
[0037] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the invention, and detailed implementation methods and specific implementation processes are provided, but the protection scope of the present invention is not limited to The following implementation examples.
[0038] Step 1) Identify the edge of the top surface of the flat top rib, including (1) the judgment of edge concavity and convexity, that is, to judge the concavity and convexity of any point on the common edge of two adjacent topological surfaces to determine the concavity and convexity of the common edge, according to Definition 1 and Definition 2 ,S...
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The invention belongs to the technical field of aircraft digital manufacturing, and provides a method for generating a numerical control cutter path of the top surface of a flat reinforcement. The overall process for realizing the method comprises the steps of 1, identifying an end edge of the top surface of the flat top reinforcement; 2) discretizing a boundary of the top surface of the flat topreinforcement and performing constrained Delaunay triangulation on the top surface of the flat top reinforcement; 3) locating branch circles of the top surface of the flat top reinforcement; 4) dividing branch areas of the top surface of the flat top reinforcement and constructing branch frameworks; 5) combining the branch frameworks and generating a machining cutter path of the top surface of theflat top reinforcement. Practice proves that the method has the characteristics of being high in cutter path calculation efficiency, high in speed, small in occupied space and the like, and can be used for generating the cutter path of the top surface of the flat top reinforcement of an aircraft structural member, so that the efficiency of fast numerical control programming is improved, and the workload of process technicians is remarkably reduced.
Description
technical field [0001] The invention belongs to the technical field of aircraft digital manufacturing, and relates to a method for generating a tool track on the top surface of a flat top rib of an aircraft structural part based on a structured skeleton, which is used for rapid programming of a numerical control program for a complex structural part of an aircraft, and is a professional and intelligent CAD / The CAPP / CAM integrated system "Fast NC Programming System for Aircraft Structural Parts" provides relevant technical support for the automatic generation of tool paths. Background technique [0002] In order to meet the ever-increasing aircraft performance requirements, a large number of integrated monolithic structures are used in the design process of aircraft structural parts, which increases the difficulty of downstream process design, which makes the CNC machining of aircraft structural parts a "bottleneck" in aircraft manufacturing. Flat top ribs are one of the mos...
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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20
Inventor 房志亮刘本刚方柏鑫
Owner SHENYANG AIRCRAFT CORP