A peen forming method for a ribbed structure

A technology for shot peening and structural parts, applied in the field of shot peening, can solve the problems of deflection profile, instability, torsion, etc., and achieve the effect of increasing the amount of shot peening deformation and improving the fatigue life.

Active Publication Date: 2009-09-16
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the bending forming of ribbed structural parts, at present, the forming methods of press bending or

Method used

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  • A peen forming method for a ribbed structure
  • A peen forming method for a ribbed structure
  • A peen forming method for a ribbed structure

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example one

[0025] Shot peening the ribbed structure to form a convex bending deformation along the rib direction. The material is aluminum alloy 2024T351, the target radius of curvature is 2500mm, the rib height is 50mm, the wall thickness is 10mm, the rib thickness is 6mm, and the wall width is 90mm. The material shot peening method is as follows:

[0026] 1) Determine the position of the neutral axis, divide the cross section of the ribbed structure into i graphics, and use the centroid coordinate formula of the cross-sectional graphics in material mechanics to calculate y - = Σ A i y ‾ i Σ A i Determine the position of the neutral axis of the section of the ribbed struc...

Example Embodiment

[0028] Example two

[0029] Shot peening the ribbed structural parts to form a concave bending deformation along the rib direction. The material is aluminum alloy 2024T351, the target radius of curvature is 4000mm, the rib height is 56mm, the wall thickness is 4mm, the rib thickness is 4mm, and the wall width is 70mm. The forming method is as follows:

[0030] 1) Determine the position of the neutral axis, y - = Σ A i y ‾ i Σ A i = 70 × 4 × 2 + 56 × 4 × 32 70 ...

Example Embodiment

[0032] Example three

[0033] Shot peening formed the ribbed structure to form a convex bending deformation along the direction of the ribs. The overall ribbed structure shape is " "The material is aluminum alloy 2024T351, the target radius of curvature is 2000mm, the rib height is 45mm, the wall thickness is 9mm, the rib thickness is 8mm, the top width of the rib is 20mm, the top thickness of the rib is 6mm, and the wall width is 85mm using prestressed shot peening. , The forming method is as follows:

[0034] 1) Determine the position of the neutral axis, divide the cross section of the ribbed structure into i graphics, and use the centroid coordinate formula of the cross-sectional graphics in material mechanics to calculate y - = Σ A i y ‾ i Σ ...

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Abstract

The invention belongs to the peen forming technology, which relates to a peen forming method for a ribbed structure. The method comprises the following steps: first, the section of the ribbed structure is calculated by the areal coordinate formula used for calculating section graphic in material mechanics for determining the position of a neutral axis of the ribbed structure section; and then the peen area is determined by the exterior of the ribbed structure. When the required bending deformation amount of the ribbed structure is relatively large, the ribbed structure can be put on a pre-stressed fixture, elastic pre-bending force is applied to the ribbed structure along the direction of the rib, and then peen forming can be conducted. The method determines the tensile deformation area to be the peen area through the rib bending neutral axis and shields the non-peen area at the same time, so as to realize the peen bending forming of the integral ribbed structure; therefore, in the bending forming process of the ribbed structure, no torsion, flexure, sectional distortion, and the like phenomena happen. The method of the invention is also applicable to the peen bending forming of the integral structures with I-shaped or inversed-T-shaped rib section shapes.

Description

technical field [0001] The invention belongs to shot peening forming technology, and relates to a shot peening forming method of ribbed structural parts. Background technique [0002] Shot peening technology uses high-speed shot blasting to hit the surface of the metal plate, causing the impacted surface and its underlying metal material to undergo plastic deformation and elongate, so that the plate is gradually bent and deformed toward the sprayed surface to achieve the desired shape. a forming method. This technology began in the early 1950s and gradually developed with the wide application of aircraft integral panel parts. Because this forming method does not require special molds and presses in the forming process, the forming method is flexible and diverse, and is very suitable for small batch production. Therefore, the shot peening method is widely used in aircraft wings, fuselages and launch vehicle fuel tanks Waiting for siding forming. However, for the bending fo...

Claims

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Application Information

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IPC IPC(8): B23P17/00
Inventor 曾元松黄遐
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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