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Shape and position error detection and evaluation method for skin frame truss structure housing

A form-position error and skin frame technology, which is applied in the field of form-position error detection and evaluation for skin-frame-truss structure shells, can solve the problems of high measurement cost and inapplicability to on-site measurement in workshops, and achieve strong reliability Effect

Inactive Publication Date: 2014-04-09
CAPITAL AEROSPACE MACHINERY +1
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Problems solved by technology

The non-contact measurement method mainly uses some advanced digital measurement equipment to realize the measurement of shape and position errors, such as coordinate measuring instruments, etc.; this measurement method requires special measurement equipment and operating space, and the measurement accuracy is good but the measurement cost is high. Not suitable for on-site measurements in workshops

Method used

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  • Shape and position error detection and evaluation method for skin frame truss structure housing
  • Shape and position error detection and evaluation method for skin frame truss structure housing
  • Shape and position error detection and evaluation method for skin frame truss structure housing

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Embodiment Construction

[0024] A form-position error detection and evaluation method for skin frame-truss structure shells, comprising the following steps:

[0025] Step 1: Adjust the measuring platform, select different sizes of measuring transition rings according to different product diameters, and install the transition rings on the measuring platform by using the crane.

[0026] For skin frame and truss structure shell products with different diameters, the number of sampling points should be different during measurement. The smaller the shell diameter, the better the rigidity of the product, and the fewer the number of measurement sampling points can be set. For shells with a diameter below 2250mm, 8-point circumferential uniform sampling is sufficient to meet the detection requirements; for shells with a diameter above 3350mm, 36 points are used for circumferential uniform sampling; for products with a diameter between 2250mm and 3350mm, the number of measurement points can be appropriately in...

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Abstract

The invention belongs to a detection evaluation method, and specifically relates to a shape and position error detection and evaluation method for a skin frame truss structure housing. The method comprises the following steps: step one, adjusting a measuring bench, and using a crown block to install a transition ring on the measuring bench; step two, according to positioning signs of the transition ring and a product, lifting the product on the transition ring for positioning and clamping; step three, using tools such as a dial gauge, a vernier caliper, standard gauge block and the like to measure the radial error values of the product and performing recording; and step four, calculating shape and position tolerance values and performing recording, the shape and position tolerance values being final detection results. The verification results demonstrate that the measuring results obtained by use of the technology is of high credibility, thus the method provided by the invention can be used as a method for measuring shape and position tolerance of a skin frame truss structure housing product. The technology can also be polarized and applied to the detection and evaluation of a part with quite large profile dimension.

Description

technical field [0001] The invention belongs to detection and evaluation methods, and in particular relates to a form-position error detection and evaluation method for skin frame-truss structure shells. Background technique [0002] Skin frame truss structure (also known as semi-monocoque structure) has been widely used in aerospace shell products at home and abroad because of its high structural strength, light product quality, and easy assembly and production. In the field of aerospace, this kind of structural shell generally has the characteristics of a rotating body and has a large diameter, so it is difficult to measure its shape and position error. At present, the measurement methods of product shape and position errors are mostly for small workpieces (generally parts), and there is no detection technology specifically for the shape and position errors of skin frame-truss assembled structural shells. The shape and position tolerance requirements of the skin frame tru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/00G01B5/20G01B5/252G01B5/24G01B5/28
Inventor 张普光王学明章茂云孙立强孟令博周龙飞
Owner CAPITAL AEROSPACE MACHINERY
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