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PATCH design method for machining group holes in curved surface of aviation structural member

A technology of aviation structural parts and design methods, which is applied in the field of aviation parts processing, can solve the problems of inadaptability to processing requirements, low hole-making efficiency, and long processing time of a single drill bit, so as to ensure the processing quality of group holes and improve the hole-making efficiency Effect

Pending Publication Date: 2022-04-01
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-order group hole processing, the processing time of a single drill bit is long, the hole making efficiency is low, and it is not suitable for processing requirements

Method used

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  • PATCH design method for machining group holes in curved surface of aviation structural member
  • PATCH design method for machining group holes in curved surface of aviation structural member
  • PATCH design method for machining group holes in curved surface of aviation structural member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A PATCH design method for processing a group of holes on a curved surface of an aerostructure, comprising the following steps:

[0043] 1) Collect surface point data

[0044] According to the curvature distribution characteristics of the free-form surface, it is divided into different regions in the longitude and latitudinal direction, and points are evenly distributed on the boundary curve of the region with the spacing of the holes to be processed at equal intervals, and the point data of discrete points are collected. The point data includes but not limited to the coordinates of the data points;

[0045] 2) Fit the interpolation curve according to the point data

[0046] Use cubic spline curves to fit discrete point data to discrete point data in each direction, and solve the equation of the interpolation curve;

[0047] 3) Calculate the tangent vector of the discrete point along two directions, and solve the normal vector of the discrete point by cross product, th...

Embodiment 2

[0069] According to the requirements of noise reduction, hundreds of thousands of acoustic liner holes need to be made on the existing annular double-curvature surface structure of the flow channel surface of the aero-engine nacelle, and the allowable normal vector deviation is θ=±5°. The PATCH design method for engine nacelle runner surface group hole processing includes the following steps:

[0070] Collect surface point data

[0071] Analyzing the shape characteristics of the runner surface, in the direction perpendicular to the airflow, the range of curvature of the curved surface is small; in the direction parallel to the airflow, the range of curvature is large. Therefore, the directions perpendicular to the airflow and parallel to the airflow are defined as latitudinal and warp directions, respectively. Divide the strips in two directions with equal intervals between hole groups, define the intersection points of the strip boundary curves as discrete points, and extrac...

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Abstract

The invention relates to the field of aviation part machining, in particular to a PATCH design method for machining group holes in a curved surface of an aviation structural part, which comprises the following steps: collecting point location data of the curved surface; fitting an interpolation curve according to the point location data; fitting discrete point location data for the discrete point data by using a cubic spline curve in each direction, and solving an equation of an interpolation curve; tangent vectors of the discrete points in the two directions are calculated, and normal vectors of the discrete points are solved through cross multiplication, so that normal vector information of the whole curved surface is obtained; and with the normal vector angle deviation of the drilling hole site as a constraint condition, iteratively calculating the size of the drilling matrix unit PATCH in the warp direction and the weft direction in sequence. According to the method, in the machining process of the free-form surface high-order-of-magnitude group holes, the geometric features of the curved surface are matched, the normal vector deviation of the hole site is controlled, high-order-of-magnitude batch rapid hole forming on the free-form surface by the gang drill is achieved, the hole forming efficiency can be improved, and the group hole machining quality is guaranteed.

Description

technical field [0001] The invention relates to the field of aerospace parts processing, in particular to a PATCH design method for machining curved surface group holes of aviation structural parts. Background technique [0002] In the existing aviation field, aircraft structural parts have different shapes and require high processing. Machining high-order group holes on free-form surfaces is currently a technical problem that restricts the hole-making process of NC machining for aeronautical structural parts. On the one hand, when drilling holes on a free-form surface, the curvature distribution of the processed surface is irregular, and the normal vector angles of the holes are different from each other. When using multi-spindle row drilling to make holes, multiple drill bits make holes in parallel, and the normal vectors of the holes are parallel, and there is an angular deviation from the normal vector of the hole position. On the other hand, the high-order group of ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/17G06F30/15G06F111/04
Inventor 罗潘袁信满胡智钦王嘉颖龚清洪侯珺森胡立徐正德
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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