A warping correction method for thin-walled "⊥"-shaped ribbed wall panels

Abstract

The present invention discloses a warping and shaping method for thin-walled "⊥"-shaped ribbed wall panels, which adopts prestressed rotary vane shot peening, and according to the key area shape control principle, simultaneously performs shot peening and shaping in the chord-span direction, using line and surface, while solving the warping in the span direction of the wall panels, avoiding the problem of uneven skin in the chord direction. The method does not require clamping and shielding parts during the processing process, and has high processing efficiency; simultaneous shot peening and shaping in the chord-span direction can avoid the problem of uneven skin in the chord direction.

Description

Technical Field

[0001] The invention relates to the technical field of shot peening forming, and is a rotary vane shot peening shaping method for the problem of part warping of thin-walled "⊥"-shaped ribbed wall panels caused by mechanical processing. Background Art

[0002] With the development of the aerospace industry, thin-walled parts are widely used, especially in the wings, fuselage and other parts, where thin-walled ribbed integral panels are increasingly used to reduce weight. However, the structure of such panels is relatively complex and the rigidity is relatively weak. In CNC machining, they are easily affected by clamping force and cutting force, and are prone to warping and deformation. In particular, ribbed panels with "⊥" ribs have thin vertical ribs and no rib top widening structure, so their rigidity is worse than that of "I" ribs and "Г" ribs. Therefore, the warping problem of thin-walled "⊥" ribbed panels is more prominent.

[0003] Wing or fuselage panels generally have a certain curvature shape along the chord direction. Shot peening uses the high-speed impact of metal projectiles on the surface of metal materials to produce plastic deformation and cause the extension of the panel. Since the extension direction of the material is not unique, shot peening for spanwise warping of the panel often causes chordwise deformation, affecting the smoothness of the chordwise shape of the skin, that is, the surface waviness. Especially for thin-walled parts, due to their poor rigidity, this adverse effect will be magnified. After traditional shot peening, there will be obvious depression at the bottom of the vertical rib or deformation of the skin, which seriously affects the conformity of the chordwise shape. Therefore, it is necessary to adopt a spanwise warping correction method for thin-walled "⊥"-shaped ribbed panels that can ensure the smoothness of the chordwise shape. Summary of the invention

[0004] The present invention aims to solve the warping deformation problem of thin-walled “⊥”-shaped ribbed wall panels after mechanical processing mentioned in the background technology, and proposes a rotary vane shot peening correction method that can ensure the chordal shape of the wall panels.

[0005] A warping correction method for thin-walled "⊥"-shaped ribbed sidings adopts prestressed rotary vane shot peening. According to the shape control principle of key areas, shot peening correction is performed simultaneously in the chord-span direction, using line to surface, so as to solve the warping of the siding in the span direction and avoid the problem of uneven skin in the chord direction.

[0006] Proceed as follows:

[0007] 1 Apply prestress. Place the wall panel on the shape inspection pallet, and apply prestress at the warped ends of the wall panel until the outer surface of the skin is completely fitted with 2 to 3 inspection pallets in the middle without leaving any gap. When there is a gap between the outer surface of the skin and the inspection pallet at the edge of the wall panel, apply auxiliary prestress at the edge of the wall panel. On the one hand, the wall panel undergoes elastic bending deformation in the opposite direction of the warping direction, and the spanwise shot peening correction prestress is applied. On the other hand, the inspection pallet is used to detect the conformity of the shape during the correction process.

[0008] 2. Segmental correction. Shot peening is performed on the ribs and skins at each inspection plate in the order from the middle to the two ends along the span of the wall panel. The specific process is as follows:

[0009] 2-1 Perform rotary vane shot peening on the areas on both sides of the vertical reinforcement until the gap between the bottom of the vertical reinforcement and the inspection pallet reaches 0.10-0.15mm, so that the vertical reinforcement will deform in the opposite direction of warping due to surface extension brought about by rotary vane shot peening under the action of prestress.

[0010] 2-2 The inner surface of the skin in an area about 40mm wide on both sides of the ribs is subjected to rotary shot peening until an obvious light-transmitting gap appears between the area about 60mm wide at the bottom of the ribs and the inspection pallet. This step drives the spanwise deformation of the ribs through the skin to further eliminate warping.

[0011] 2-3 After completing the shaping of all the vertical ribs along the chord direction of the wall panel from the middle to the edge according to steps 2-1 to 2-2, check the gap between the wall panel and the inspection card, and perform rotary vane shot peening on the inner surface of the skin where the gap is 0, so as to reduce the gap at the bottom of the vertical rib until the outer surface of the skin is completely in contact with the inspection card to ensure that the chordal shape of the wall panel is smooth.

[0012] 2-4 Adjust the prestress at both ends of the wall panel until the wall panel is fully fitted with the two inspection card plates on both sides of the completed shaping area.

[0013] 3. Appearance inspection. After completing the shape adjustment of all inspection pallets, load according to the shape inspection requirements specified in the engineering drawings, check the gap between the wall panel and all inspection pallets. If there is an area with a gap larger than the shape inspection requirement, selectively perform rotary vane shot peening shape adjustment according to steps 2-1 to 2-4 until the gap between the wall panel and all inspection pallets meets the requirements of the engineering drawings and a qualified product is processed.

[0014] The beneficial effects of the present invention are as follows: a thin-walled "⊥"-shaped ribbed wall panel warping correction method, which does not require clamping and shielding of parts during processing and has high processing efficiency; shot peening correction is performed simultaneously in the chord-span direction, which can avoid the problem of uneven chord-wise skinning.

[0015] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of thin-walled "⊥" ribbed wall panels and inspection pallets

[0017] Figure 2 This is a schematic diagram of the span direction of the thin-walled "⊥"-shaped ribbed wall panel

[0018] Figure 3 This is a schematic diagram of the chord direction of a thin-walled “⊥”-shaped ribbed wall panel.

[0019] Figure 4 This is a schematic diagram of the shape correction of thin-walled "⊥" ribbed wall panels Figure 1

[0020] Figure 5 This is a schematic diagram of the shape correction of thin-walled "⊥" ribbed wall panels Figure 2

[0021] Figure 6 This is a schematic diagram of the shape correction of thin-walled "⊥" ribbed wall panels Figure 3

[0022] Explanation of numbers in the figure: 1 wall panel, 2 inspection card, 3 wall panel end, 4 wall panel edge, 5 vertical rib, 6 skin inner surface, 7 skin outer surface, 8 vertical rib sides, 9 vertical rib bottom, 10 skin inner surface, 11 skin inner surface DETAILED DESCRIPTION

[0023] by Figure 1 The thin-walled “⊥”-shaped ribbed wall panel shown is taken as an example to further illustrate the specific implementation of the present invention.

[0024] The specific implementation steps are:

[0025] 1 Place the wall panel 1 on the inspection card board 2, as shown in Figure 1 Use 3.8kg sandbags to load the panel end 3, with the loading sandbags spaced 200mm apart. Adjust the number of loaded sandbags according to the actual warping deformation until the outer surface 7 of the skin is completely fitted with the three inspection card plates 2 in the middle without leaving any gaps. Figure 2 In the case where there is a gap between the outer surface 7 of the skin at the edge 4 of the wall panel and the inspection card 2, a sand bag is loaded at the edge 4 of the wall panel at the inspection card 2 to apply auxiliary prestress so that the outer surface 7 of the skin is completely fitted with the inspection card 2, as shown in FIG. Figure 3 shown.

[0026] 2 Along the span direction of the wall panel 1, from the middle to the two ends, perform rotary vane shot peening and correction on each inspection card plate 2 in accordance with steps 3 to 6.

[0027] 3. Shot peening is performed on both sides of the ribs 8 until the gap between the bottom 9 of the ribs and the inspection card 2 reaches 0.10-0.15 mm, so that the ribs 5 are deformed in the opposite direction of the warping due to the surface extension brought by the shot peening under the action of prestress, such as Figure 4 shown.

[0028] 4. The inner surface 10 of the skin with a width of about 40 mm on both sides of the rib 8 is subjected to rotary blade shot peening until an obvious light-transmitting gap appears between the bottom 9 of the rib and the inspection card 2 with a width of about 60 mm. This step drives the spanwise deformation of the rib 5 by extending the inner surface 10 of the skin, further eliminating the warping. Figure 5shown.

[0029] 5 According to steps 3 to 4, complete the shape adjustment of all the vertical ribs 5 in the order from the middle to the edge along the chord direction, check the gap between the wall panel 1 and the inspection card plate 2, and perform rotary vane shot peening on the inner surface 11 of the skin where the gap is 0, so as to reduce the gap at the bottom of the vertical rib 9, until the outer surface 7 of the skin is completely fitted with the inspection card plate 2, to ensure that the chord shape of the wall panel 1 is smooth, such as Figure 6 shown.

[0030] 6 Adjust the prestress of the wall panel end 3 until the wall panel 1 is completely fitted with the two inspection card plates 2 on both sides of the completed shaping area.

[0031] 7 After completing the calibration of all inspection pallets 2, 2 The load is required to be no more than 7.6kg, and the gap between the wall panel 1 and all the inspection pallets 2 is checked. For the area larger than 0.5mm, perform rotary vane shot peening and correction according to steps 1 to 6 until the gap between the wall panel 1 and all the inspection pallets 2 is no more than 0.5mm, and a qualified product is processed.

[0032] This method has been applied in actual engineering projects. It can not only effectively correct the warping deformation of thin-walled "⊥"-shaped ribbed wall panels, but also the chord-wise corrugation of the wall panels after correction can meet the design requirements.

[0033] The above describes the specific embodiments of the present invention. The present invention is not limited to the above specific embodiments. Those skilled in the art can make various deformations or modifications within the scope of the claims without affecting the essential content of the present invention.

Claims

1. A method for warping and correcting thin-walled "⊥"-shaped ribbed wall panels, characterized in that The following steps are involved: 1-1 Apply prestress, the specific process is: place the wall panel on the shape inspection card plate, apply prestress at the warped parts of the two ends of the wall panel, until the outer surface of the skin is completely fitted with 2 to 3 inspection card plates in the middle position without leaving any gap, and when there is a gap between the outer surface of the skin and the inspection card plate at the edge of the wall panel, apply auxiliary prestress at the edge of the wall panel; 1-2 Segmented correction, the specific process is: along the span direction of the wall panel, from the middle to the two ends, the vertical ribs and skins at each inspection card are subjected to rotary vane shot peening correction, wherein the vertical ribs and skins at each inspection card are subjected to rotary vane shot peening correction, the specific process is: a) Shot peening is performed on both sides of the ribs until the gap between the bottom of the ribs and the inspection plate reaches 0.10-0.15 mm, so that the ribs are deformed in the opposite direction of the warping due to surface extension caused by the shot peening under the action of prestress; b) Shot peening is performed on the inner surface of the skin in an area about 40 mm wide on both sides of the ribs until an obvious light-transmitting gap appears between the area about 60 mm wide at the bottom of the ribs and the inspection card. This step drives the ribs to deform in the span direction through the skin, further eliminating warping; c) After all the vertical ribs are calibrated in the order from the middle to the edge along the chord direction of the wall panel according to steps a) to b), the gap between the wall panel and the inspection card is checked, and the inner surface of the skin where the gap is 0 is subjected to rotary vane shot peening to reduce the gap at the bottom of the vertical rib until the outer surface of the skin is completely fitted with the inspection card to ensure that the chordal shape of the wall panel is smooth; d) Adjust the prestress at both ends of the wall panel until the wall panel is completely fitted with the two inspection card plates on both sides of the completed alignment area; 1-3 Appearance inspection. The specific process is: load according to the appearance inspection requirements specified in the engineering drawings, check the gap between the wall panel and all inspection pallets. If there is an area with a gap larger than the appearance inspection requirement, perform rotary vane shot peening and correction according to steps a) to d) until the gap between the wall panel and all inspection pallets meets the requirements of the engineering drawings and a qualified product is processed.

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