Method for generating annular cutter path based on image processing under condition of skin mirror image milling process constraints
A technology of image processing and constraints, applied in instruments, computer control, simulators, etc., can solve problems such as difficult to meet process constraints, uneven tool path, etc., and achieve the effect of qualified step distance and smooth trajectory.
Active Publication Date: 2019-08-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0007] The purpose of the present invention is to solve the problem that the traditional tool path generation method is difficult to meet the process constraints and is not suitable for skin mirror milling, and to invent a circumcision tool path generation method based on image processing under the constraints of skin mirror milling process. It generates the initial circular cutting tool path according to the geometric boundary of the processing area, avoiding the phenomenon that the tool path is not smooth due to geometric degradation, and uses image processing technology to iteratively deform the tool path, and through overall optimization, the final generated tool path meets the skin mirror milling process constraint
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0039] A method for generating circumcision tool paths based on image processing under the constraints of skin mirror milling process, which includes the following steps:
[0040] S1: Create a binary image with size a*b according to the contour line of the geometric boundary of the area to be processed, in which the value of the pixel point passing by the contour line is 1, and the value of the remaining pixel points is 0; a≥x max -x min ,b≥y max -y min , where x, y are the geometric boundary plane coordinates of the processing area.
[0041] S2: Extract the skeleton of the binary image, remove the skeleton branch, retain the central skeleton, and calculate the shortest Euclidean distance between the contour pixel point and the central skeleton;
[0042] S3: take the center skeleton as the center and generate the initial circular cutting to...
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The invention discloses a method for generating an annular cutter path based on image processing under the condition of skin mirror image milling process constraints. The method comprises the steps of(1) extracting boundary geometrical characteristics of a to-be-machined cavity area on a skin, and converting the boundary geometrical characteristics into an image; (2) extracting a central skeletonof the binary image, and calculating a shortest Euclidean distance between a pixel point of a contour line and the central skeleton; (3) performing outward biasing by taking the central skeleton as acenter to generate an initial annular cutter path; and (4) converting the initial cutter path into an image, carrying out process constraint verification on the cutter path, and carrying out iterative deformation on the cutter path image by utilizing a moving least squares technology to optimize the cutter path until the optimal annular cutter path meeting the process constraints is obtained. Themethod disclosed by the invention can overcome the defect that a traditional cutter path generating method is difficultly suitable for the skin mirror image milling process constraints; the generation of the cutter path under the process constraints is realized; the mirror image milling cutter path which meets the requirements of no machining residues, qualified step pitch, smooth trajectory andno cutter lifting is finally obtained; and the requirements of skin mirror image milling are met.
Description
technical field [0001] The invention belongs to the technical field of computer-aided manufacturing (CAM), in particular to a method for generating and optimizing a ring cutting tool track, in particular to a method for generating a ring cutting tool track for skin mirror milling. The geometric boundary of the cavity to be processed is converted into image information, and then based on this information, image processing technology is used to generate and optimize the ring cutting tool path under the constraints of the process. Background technique [0002] There are many groove features on the aircraft skin. Due to its own characteristics, large size, complex shape, high material removal rate, and poor rigidity, its processing quality has not been well controlled. In order to overcome the disadvantages of excessive deformation of the skin due to insufficient rigidity during the milling process, the current manufacturing industry adopts a skin mirror milling system. Add rig...
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IPC IPC(8): G05B19/4097
CPCG05B19/4097
Inventor 李迎光许可杨梦媛向兵飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS