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Free Forming Dynamic Optimization Method for Geometric Precise Position of Head and Tail of 3D Elbow

A three-dimensional, head-to-tail technology is applied in the field of free-form dynamic optimization of the geometrically accurate positions of the head and tail of a three-dimensional elbow of an aerospace vehicle, and achieves the effect of important engineering application value, simple and feasible method, and obvious economic benefits.

Active Publication Date: 2019-01-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the deficiencies of pipes with complex spatial axis shapes with precise head and tail geometric positions, the present invention proposes a free-forming dynamic optimization method for aerospace three-dimensional curved pipes with precise head and tail geometric positions

Method used

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  • Free Forming Dynamic Optimization Method for Geometric Precise Position of Head and Tail of 3D Elbow
  • Free Forming Dynamic Optimization Method for Geometric Precise Position of Head and Tail of 3D Elbow
  • Free Forming Dynamic Optimization Method for Geometric Precise Position of Head and Tail of 3D Elbow

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Experimental program
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Effect test

Embodiment 1

[0047]The first step is to establish a planar elbow with an outer diameter of 20mm, a wall thickness of 6mm, a straight section length of 500mm, 700mm, 900mm, and 435mm, and an arc section radius of 300mm, 400mm, and 250mm ( Figure 4 Shown) the geometric shape parameters of the straight section, transition section, and curved section to shape the first section of bending.

[0048] In the second step, during the forming process, the laser scanning device carried by the manipulator dynamically scans the first bending section to obtain the starting point P 0 , node P 1 and P 2 coordinates, and feedback the geometric data to the control software;

[0049] The third step is to compare the actual bending result with the theoretical digital model through three-dimensional modeling, and calculate the error value between the actual bending angle and the theoretical bending angle of the first segment;

[0050] The fourth step is to modify the relationship between the bending radius ...

Embodiment 2

[0053] The first step is to create a three-dimensional elbow with an outer diameter of 20mm, a wall thickness of 6mm, a straight section length of 320mm, 4800mm, and 250mm, and a radius of the arc section of 135mm ( Figure 4 Shown) the geometric shape parameters of the straight section, transition section, and curved section to shape the first section of bending.

[0054] In the second step, during the forming process, the laser scanning device carried by the manipulator dynamically scans the coordinate T of the starting point of the first segment 0 , node T 1 and T 2 , and feedback the geometric data to the control software;

[0055] The third step is to compare the actual bending result with the theoretical digital model through three-dimensional modeling, and calculate the error value between the actual bending angle and the theoretical bending angle of the first segment;

[0056] The fourth step is to modify the relationship between the bending radius and the eccentric...

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Abstract

The invention discloses a free forming dynamic optimization method of head and tail geometrical accurate positions of a three-dimensional elbow pipe. The method comprises the steps that firstly, according to theoretical analysis parameters, free bending forming is conducted on a section; secondly, dynamic scanning is conducted through laser scanning equipment, thus, coordinates of joints of the bent section are obtained, and geometrical data are fed back to control software; the error between the actual bending angle and a theoretical value is measured through three-dimensional modeling; a correction factor k is introduced, the relation between the bending radius and the ball head eccentric distance is corrected, the error value of the bending angle is eliminated, and the error between the actual position and the theoretical position of the bending tail end joint relative to the first joint after actual free bending is decreased as much as possible or eliminated; and if the error is not completely eliminated, the positions of the subsequent joints continue to be adjusted, thus, the spatial bent pipe tail end is located in the assigned position, and accordingly accurate control over the spatial bent pipe head and tail geometrical positions is achieved.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of metal complex components, in particular to a free forming dynamic optimization method for geometrically precise positions of the head and tail of a three-dimensional curved pipe of an aerospace vehicle. Background technique [0002] The accuracy of the relative geometric relationship between the head and the end of the three-dimensional complex elbow is of great significance in the process of manufacturing and precise assembly of aerospace vehicles. However, the existing bending forming methods all have different degrees of springback, especially for three-dimensional space bends. Precise assembly of aerospace vehicles presents challenges. The present invention is based on the concept of segmented measurement and closed-loop feedback, through the dynamic and real-time adjustment of the free bending forming process, and finally realizes the accurate control of the relative positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D7/08B21D7/16B21D7/14G06F17/50
CPCB21D7/085B21D7/14B21D7/16G06F30/20
Inventor 郭训忠陶杰万柏方黎波马燕楠徐勇李洪东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS