CN114951425A

CN114951425A - Thin-wall T-shaped ribbed wallboard warping and shape correcting method

Info

Publication number: CN114951425A
Application number: CN202210407294.4A
Authority: CN
Inventors: 耿育科; 肖静怡; 徐刚; 别吉松; 陈浩
Original assignee: AVIC Xian Aircraft Industry Group Co Ltd
Current assignee: AVIC Xian Aircraft Industry Group Co Ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-08-30

Abstract

The invention discloses a warping correction method for a thin-wall T-shaped ribbed wallboard, which adopts prestressed rotary sheet shot blasting, performs shot blasting correction on the chord extension direction according to the shape control principle of a key region, and avoids the problem of poor smoothness of a chord-direction skin while solving the problem of warping of the wallboard in the chord extension direction by using a linear surface. The method does not need to clamp and shield parts in the processing process, and has high processing efficiency; the shot blasting shape correction is carried out simultaneously in the chord extending direction, so that the problem that the skin is not smooth in the chord direction can be avoided.

Description

Thin-wall T-shaped ribbed wallboard warping and shape correcting method

Technical Field

The invention relates to the technical field of shot-peening forming, in particular to a rotary-vane shot-peening shape correcting method for solving the problem of part warping caused by machining of a thin-wall inverted T-shaped ribbed wall plate.

Background

With the development of the aerospace industry, thin-wall parts are widely adopted, and particularly, thin-wall ribbed integral wall plates are increasingly adopted at parts such as wings, fuselages and the like to reduce weight. However, the structure of the wallboard is complex, the rigidity is weak, and the wallboard is easily warped and deformed under the influence of clamping force, cutting force and the like in numerical control processing. Particularly, the vertical rib of the ribbed wallboard with the inverted T-shaped rib has thinner thickness, does not have a rib top widening structure, has poorer rigidity than the inverted T-shaped rib and the inverted T-shaped rib, and therefore, the warping problem of the thin-wall inverted T-shaped ribbed wallboard is more prominent.

Wing or fuselage panels typically have a curved profile in the chordwise direction, and shot peening uses metal projectiles to impact the surface of a metal material at high velocity to cause plastic deformation and thus elongation of the panel. Because the extension direction of the material is not unique, the shot blasting correction aiming at the extension direction warping of the wall plate often causes chordwise deformation, and the smooth degree of the chordwise appearance of the skin, namely the surface waviness, is influenced. Particularly for thin-wall parts, due to poor rigidity, the adverse effect is amplified, and obvious bottom depression of the stud or skin bulging deformation can occur after the traditional shot blasting shape correction, so that the chord-direction appearance conformity is seriously affected. Therefore, a method for correcting the stretch, warp and shape of the thin-wall reversed-T-shaped ribbed wallboard, which can ensure smooth chord-wise appearance, is needed.

Disclosure of Invention

The invention aims to solve the problem of warping deformation of a thin-wall T-shaped ribbed wallboard after machining in the background technology, and provides a rotary-vane shot blasting shape correcting method capable of ensuring the chordwise shape of the wallboard.

A thin-wall T-shaped ribbed wallboard buckling correction method adopts prestress rotary sheet shot blasting, and performs shot blasting correction on chord extension direction according to a key region appearance control principle, so that the problem that chord direction skin is not smooth is solved by using a linear surface while the wallboard is buckled in the chord extension direction.

The method comprises the following steps:

1 applying a pre-stress. Place the wallboard on the appearance inspection cardboard, exert prestressing force in wallboard both ends head warpage department, laminate completely with 2 ~ 3 inspection cardboards of intermediate position up to the skin surface, do not keep the clearance, when there is the clearance in wallboard edge skin surface and inspection cardboard, exert supplementary prestressing force at wallboard edge. On one hand, the wall plate is elastically bent and deformed in the direction opposite to the warping direction, the spanwise shot blasting shape correction prestress is applied, and on the other hand, the inspection clamping plate is used for detecting the conformity of the external shape in the shape correction process.

And 2, correcting the shape in a segmented manner. And (4) performing rotary-vane shot blasting shape correction on the studs and the skins at the positions of the inspection clamping plates in the sequence from the middle to the two ends along the spanwise direction of the wall plate. The specific process is as follows:

2-1, performing rotary-vane shot blasting on the areas on the two sides of the stud until the gap between the bottom of the stud and the inspection clamping plate reaches 0.10-0.15 mm, so that the stud is deformed in the direction opposite to the warping direction through surface extension caused by the rotary-vane shot blasting under the action of prestress.

2-2, carrying out rotary-vane shot blasting on the inner surface of the skin in each area with the width of about 40mm on each side of the stud until an obvious light-permeable gap appears between each area with the width of about 60mm at the bottom of the stud and the inspection clamping plate, and driving the span-wise deformation of the stud through the skin in the step so as to further eliminate the warpage.

2-3, finishing shape correction of all studs along the chord direction of the wall plate from the middle to the edge according to the steps 2-1-2, checking the gap between the wall plate and the inspection clamping plate, and performing rotary-vane shot blasting on the inner surface of the skin with the gap of 0, so that the gap at the bottom of the stud is reduced until the outer surface of the skin is completely attached to the inspection clamping plate, and the smooth appearance of the chord direction of the wall plate is ensured.

And 2-4, adjusting the prestress of two ends of the wall plate until the wall plate is completely attached to the 2 inspection clamping plates on two sides of the finished shape correction area.

And 3, detecting the appearance. And after finishing the shape correction of all the inspection clamping plates, loading according to the shape detection requirements specified by the engineering drawing, checking gaps between the wall plate and all the inspection clamping plates, and selectively performing rotary-vane shot blasting shape correction according to the steps 2-1-2-4 if an area larger than the gap required by the shape detection exists until the gaps between the wall plate and all the inspection clamping plates meet the requirements of the engineering drawing, thereby processing a qualified product.

The invention has the following beneficial effects: a thin-wall T-shaped ribbed wallboard warping and shape correcting method does not need to clamp and shield parts in the processing process, and has high processing efficiency; the shot blasting shape correction is carried out simultaneously in the chord extending direction, so that the problem that the skin is not smooth in the chord direction can be avoided.

The present application will be described in further detail with reference to the following drawings and examples.

Drawings

FIG. 1 is a schematic view of a thin-wall T-shaped ribbed wall plate and an inspection card

FIG. 2 is a schematic view of the thin-wall T-shaped ribbed wall plate

FIG. 3 is a schematic view of the chord direction of a thin-wall T-shaped ribbed wall plate

FIG. 4 is a schematic view of a thin-wall T-shaped ribbed wall plate 1

FIG. 5 is a schematic view of the shape correction of a thin-wall T-shaped ribbed wall plate 2

FIG. 6 is a schematic view of the shape correction of a thin-wall T-shaped ribbed wall plate 3

The numbering in the figures illustrates: 1 wallboard, 2 inspection clamping plates, 3 wallboard end heads, 4 wallboard edges, 5 studs, 6 skin inner surfaces, 7 skin outer surfaces, 8 stud two sides, 9 stud bottoms, 10 skin inner surfaces and 11 skin inner surfaces

Detailed Description

The thin-wall ″) t-shaped ribbed wall plate shown in fig. 1 is taken as an example to further illustrate the specific embodiment of the invention.

The specific implementation steps are as follows:

1 placing a wall plate 1 on an inspection card 2 as shown in figure 1. And 3.8kg sand bags are used for loading at the end head 3 of the wallboard, the interval between the sand bags is 200mm, and the quantity of the sand bags is adjusted according to the actual warping deformation until the outer surface 7 of the skin is completely attached to the middle 3 inspection clamping plates 2 without gaps, as shown in figure 2. In the case where there is a gap between the outer skin surface 7 and the test card 2 at the panel edge 4, a sand bag is loaded at the panel edge 4 at the test card 2, and an auxiliary prestress is applied to completely attach the outer skin surface 7 to the test card 2, as shown in fig. 3.

And 2, sequentially carrying out rotary-vane shot blasting shape correction on the positions of the inspection clamping plates 2 from the middle to two ends along the spreading direction of the wall plate 1 according to the steps 3-6.

3, performing rotary-vane shot blasting on two sides 8 of the stud until the gap between the bottom 9 of the stud and the inspection clamping plate 2 reaches 0.10-0.15 mm, so that the stud 5 generates deformation opposite to the warping direction through surface extension caused by the rotary-vane shot blasting under the action of prestress, as shown in fig. 4.

4, performing rotary-plate shot blasting on the inner surface 10 of the skin in each area with the width of about 40mm on two sides of the stud 8 until an obvious light-permeable gap is formed between each area with the width of about 60mm at the bottom 9 of the stud and the inspection clamping plate 2, and driving the expansion deformation of the stud 5 through the extension of the inner surface 10 of the skin in the step to further eliminate the warpage, as shown in fig. 5.

And 5, finishing the shape correction of all the studs 5 along the chord direction in the sequence from the middle to the edge according to the steps 3-4, checking the gap between the wallboard 1 and the inspection clamping plate 2, and performing rotary-vane shot blasting on the inner surface 11 of the skin at the position of the gap 0, so that the gap of the bottom 9 of the stud is reduced until the outer surface 7 of the skin is completely attached to the inspection clamping plate 2, and ensuring the smooth appearance of the wallboard 1 in the chord direction, as shown in fig. 6.

6, adjusting the prestress of the wall plate end head 3 until the wall plate 1 is completely attached to the 2 inspection clamping plates 2 on two sides of the finished shape correction area.

7 after finishing the alignment of all the inspection cards 2, every 0.04m ² Loading is carried out according to the requirement that the weight of the panel is not more than 7.6kg, gaps between the wall plate 1 and all the inspection clamping plates 2 are inspected, and for the area larger than 0.5mm, rotary-vane shot blasting shape correction is carried out according to the steps 1-6 until the gaps between the wall plate 1 and all the inspection clamping plates 2 are not larger than 0.5mm, and qualified products are processed.

The method is applied to actual engineering, the warping deformation of the thin-wall reversed-T-shaped ribbed wall plate can be effectively corrected, and the skin chordwise waviness of the corrected wall plate can meet design requirements.

While the present invention has been described with reference to the specific embodiments, the present invention is not limited to the above-described specific embodiments, and various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the present invention.

Claims

1. A thin-wall T-shaped ribbed wallboard warping and shape correcting method is characterized by comprising the following steps:

1-1, applying prestress;

1-2, correcting shape in sections;

1-3 shape detection.

2. The method for warping and sizing a thin-walled, "") T-shaped ribbed wallboard according to claim 1, wherein the specific process of applying the prestress in the step 1-1 is as follows: place the wallboard on the appearance inspection cardboard, exert prestressing force in wallboard both ends head warpage department, laminate completely with 2 ~ 3 inspection cardboards of intermediate position up to the skin surface, do not keep the clearance, when there is the clearance in wallboard edge skin surface and inspection cardboard, exert supplementary prestressing force at wallboard edge.

3. The method for warping and sizing a thin-walled, "") T-shaped ribbed wallboard according to claim 1, wherein the step 1-2 is performed by a segmented sizing process, which comprises the following specific steps: and (4) performing rotary-vane shot blasting shape correction on the studs and the skins at the positions of the inspection clamping plates in the sequence from the middle to the two ends along the spanwise direction of the wall plate.

4. The method for warping and sizing a thin-walled, "") T-shaped ribbed wallboard according to claim 3, wherein the spin-sheet shot blasting sizing is performed on the studs and the skins at each inspection pallet, and the specific process is as follows:

4-1, performing rotary-vane shot blasting on the areas on the two sides of the stud until the gap between the bottom of the stud and the inspection clamping plate reaches 0.10-0.15 mm, so that the stud is deformed in the direction opposite to the warping direction through surface extension caused by the rotary-vane shot blasting under the action of prestress;

4-2, performing rotary-vane shot blasting on the inner surface of the skin in each area with the width of about 40mm on each of two sides of the stud until an obvious light-permeable gap is formed between each area with the width of about 60mm at the bottom of the stud and the inspection clamping plate, and driving the span-wise deformation of the stud through the skin to further eliminate the warpage;

4-3, finishing shape correction of all studs along the chordwise direction of the wall plate from the middle to the edge according to the steps 4-1-4-2, checking the gap between the wall plate and the inspection clamping plate, and performing rotary-vane shot blasting on the inner surface of the skin at the position of the gap of 0, so that the gap at the bottom of the stud is reduced until the outer surface of the skin is completely attached to the inspection clamping plate, and ensuring smooth appearance of the wall plate in the chordwise direction;

and 4-4, adjusting the prestress of the two ends of the wall plate until the wall plate is completely attached to the 2 inspection clamping plates on the two sides of the finished shape correction area.

5. The method for warping and correcting a thin-walled, "") T-shaped ribbed wallboard according to claim 1, wherein the specific process of the step 1-3 appearance detection is as follows: loading according to the shape detection requirement specified by the engineering drawing, checking the gaps between the wall plate and all the inspection clamping plates, and if an area larger than the gap required by the shape detection exists, performing rotary-vane shot blasting shape correction according to the steps 4-1 to 4-4 until the gaps between the wall plate and all the inspection clamping plates meet the requirement of the engineering drawing, and processing a qualified product.