CN113843344B - Chord direction shot blasting forming method for wallboard containing thickness abrupt change area - Google Patents
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- CN113843344B CN113843344B CN202111098154.5A CN202111098154A CN113843344B CN 113843344 B CN113843344 B CN 113843344B CN 202111098154 A CN202111098154 A CN 202111098154A CN 113843344 B CN113843344 B CN 113843344B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
A chord direction shot blasting forming method for wallboard containing thickness abrupt change area comprises the steps of forming a sufficient wallboard thickness abrupt change area chord direction shot blasting prestress flat plate test piece by manufacturing the wallboard containing the equal thickness area and the thickness abrupt change area, wherein the thickness of the wallboard thickness abrupt change area is larger than that of the equal thickness area, designing the flat plate test piece shot blasting test method, performing a pre-bending clamping shot blasting test of the test piece, and obtaining proper clamping prestress of the wallboard thickness abrupt change area according to the experimental result; and designing a chordwise shot blasting path and specific shot blasting parameters which continuously pass through the thickness zones and the thickness abrupt change zones of the wallboard, pre-bending and clamping the thickness abrupt change zones of the wallboard, and performing chordwise shot blasting on the thickness zones and the thickness abrupt change zones of the wallboard by adopting shot blasting process parameters of the thickness zones of the wallboard in a continuous shot blasting path.
Description
Technical Field
The invention belongs to the field of aircraft manufacturing, further belongs to the field of shot peening processing of wing panels, and particularly relates to a chord direction shot peening method of a wing panel with a thickness abrupt change area.
Background
With the complexity of the wing panel structure, there are often a number of small areas of thickened area thereon. The thickened region has no abrupt change in profile curvature and only an abrupt increase in thickness compared to the constant thickness region. Thus, this localized small region of increased thickness is referred to as the abrupt thickness change region, as shown in FIG. 1. The design of the shot blasting forming method of each area of the wing wallboard is mainly based on the wallboard material characteristics, the thickness, the structure, the shape curvature and other factors of the area. Wherein, the larger the thickness of the material, the more difficult the forming. Because the thickness of the material of the thickness abrupt change region is thicker and the thickness of the material is abrupt change transition structure with the thickness of the surrounding equal-thickness region, the shot blasting forming difficulty of the thickness abrupt change region and the surrounding equal-thickness region is greatly increased.
The shot blasting parameters, the shot blasting path and the prestress are designed when the shot blasting forming method is designed. The shot parameters include shot type ρ, shot distance l, shot flow f, shot pressure p, shot velocity v. In the shot forming process, shot forming is performed along a designed shot path with the designed shot parameters in a designed pre-stress state. In the case of panel shot-peening, it is generally necessary to perform chordwise shot-peening and spanwise shot-peening, respectively. Currently, the problems associated with shot peening with multi-thickness abrupt region panels are mainly focused on chordwise shot peening, specifically:
(1) Because the thickness of the material is suddenly changed, if the wall plate thickness suddenly changed region and the equal thickness region are subjected to chordwise shot blasting forming by using the same shot blasting parameters, the shape curvature cannot meet the requirement.
The effect of material thickness t on the radius of curvature R of the shaped profile is of the order of square. Materials with thicknesses t and 2t were shaped with the same parameters, resulting in shaped radii of curvature R and 4R. Therefore, the chordwise shot forming using the same parameters results in abrupt changes in curvature of the abrupt and constant thickness regions. The required profile curvature should be smoothly transited, so the formed profile curvature cannot meet the requirement. The curvature and radius of curvature are reciprocal relationships.
(2) If the thickness abrupt change area and the equal thickness area are respectively shot-blasted by using different shot-blasting parameters, the shot-blasting path is very complex, the process design difficulty is high, and the forming risk is high.
When the chordwise shot blasting is performed by using different shot blasting parameters, the shot blasting of the equal-thickness region is completed by bypassing the thickness abrupt change region when the shot blasting path is planned, and then the thickness abrupt change region is shot blasted independently. However, the thickness abrupt change area is small in area and large in number, so that the chord direction shot blasting path of the equal thickness area cannot be planned according to the optimal scheme for bypassing the thickness abrupt change area. And the paths near the thickness abrupt change area are complicated, so that the curvature formed by the wallboard is difficult to predict in design, and the forming risk is high in actual processing.
(3) If the thickness abrupt change region and the equal thickness region are subjected to separate local shot peening, the processing operation is complicated and the shaping effect is not ideal.
Chord direction shot blasting forming is respectively carried out on the thickness abrupt change area and the equal thickness area, and a shot blasting path can be planned according to an optimal scheme, but six steps are needed to be carried out: protecting the thickness abrupt change region, performing chordwise integral shot blasting, removing the protection, protecting the thickness regions around the thickness abrupt change region, respectively blasting each thickness abrupt change region, and removing the protection. The method has long process design time and complex processing operation, and the shape of the thickness abrupt change region and the shape of the equal thickness region cannot be smoothly transited, so that the forming effect is poor.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application aims to provide a chord direction shot blasting forming method of a wallboard containing a thickness abrupt change region.
A chordwise shot peening method for a wallboard comprising a thickness abrupt change region, the wallboard comprising an equal thickness region and a thickness abrupt change region, the thickness of the thickness abrupt change region of the wallboard being greater than the thickness of the equal thickness region, shot peening parameters of the equal thickness region of the wallboard being known, the method comprising the steps of: 1) Manufacturing a sufficient wallboard thickness abrupt change area chordwise shot blasting prestress flat plate test piece, wherein the thickness of the test piece is consistent with the wallboard thickness abrupt change area, the length direction of the test piece is consistent with the chordwise direction of the wallboard, the length and the width of the test piece are required to meet the curvature measurement requirement of the test piece, the length of the test piece at least meets the distance between two shot blasting paths, and the test piece is the same as the wallboard material; 2) Designing a flat plate test piece shot blasting test method, wherein shot blasting parameters of a pre-stress flat plate test piece are the same as chord direction shot blasting parameters of a thickness area such as a wallboard, shot blasting paths of the test piece are required to be perpendicular and uniformly distributed in the length direction of the test piece, the length direction of the test piece at least comprises two shot blasting paths, chord direction pre-stressing is determined to be applied to the test piece according to the shot blasting parameters of the test piece and the thickness of a thickness mutation area, when the pre-stressing is applied, the middle part of the inner surface of the test piece is applied, meanwhile, the two ends of the outer surface of the test piece are applied, and the test piece is pre-bent into a single curved surface; 3) Performing a pre-bending clamping shot blasting test on the test pieces, respectively applying different pre-stresses on a plurality of identical test pieces to perform chordwise pre-bending clamping, respectively performing shot blasting test on the test pieces by using process parameters selected from the shot blasting process parameter range of the equal thickness area, performing chordwise curvature measurement on the test pieces after shot blasting, and obtaining proper clamping pre-stresses of the wallboard thickness abrupt change area according to the experimental result; 4) And designing chordwise shot blasting paths and specific shot blasting parameters which continuously pass through the equal-thickness areas and the thickness abrupt change areas of the wall plates. 5) And 3) pre-bending and clamping the thickness abrupt change region of the wallboard according to the clamping prestress of the thickness abrupt change region obtained in the step 3), and performing chordwise shot blasting on the thickness region of the wallboard and the thickness abrupt change region by adopting shot blasting process parameters of the thickness region of the wallboard and the thickness abrupt change region in a continuous shot blasting path.
If the wallboard contains a plurality of thickness abrupt change areas, respectively manufacturing test pieces and pre-bending clamping shot blasting tests corresponding to each thickness abrupt change area, respectively obtaining proper clamping prestress of each thickness abrupt change area, respectively pre-bending and clamping each thickness abrupt change area by adopting corresponding clamping prestress when the wallboard is shot-blasted, and then performing chordwise shot blasting on the thickness areas of the wallboard and all the thickness abrupt change areas by adopting shot blasting process parameters of the thickness areas of the wallboard and the like in a continuous shot blasting path.
When the pre-bending clamping shot blasting test of the test piece is carried out, the shot blasting paths are vertically and uniformly distributed in the length direction of the test piece, and the length direction of the test piece at least comprises two shot blasting paths.
And (3) performing chord curvature measurement on the plurality of test pieces after shot blasting to obtain a linear relation between chord prestressing force and chord curvature radius after shot blasting forming, and selecting the chord prestressing force corresponding to the target curvature radius as clamping prestressing force of the thickness abrupt change region.
The beneficial effects of this application lie in: according to the invention, chordwise prestressing is independently applied to each thickness abrupt change region on the wallboard, so that the thickness abrupt change region and the equal thickness region are subjected to shot peening forming simultaneously on a primary peening path by using the same peening parameters under the prestressing state. The purpose that the required chordwise profile curvature is formed in the thickness abrupt region and the equal thickness region by only performing chordwise shot blasting once is achieved. Compared with the prior art, the process method design and the shot blasting method are simpler and more efficient, and the qualification rate of the appearance curvature formed by shot blasting is higher.
The present application is described in further detail below with reference to the drawings of embodiments.
Drawings
FIG. 1 is an aircraft panel structure including a thickness discontinuity.
FIG. 2 is a schematic illustration of pre-bending clamping of a test piece in a thickness break.
Fig. 3 is a linear relationship between chordwise prestressing force and chordwise radius of curvature after shot peening made according to experimental results.
Fig. 4 is a schematic drawing showing chordwise peening of the panel with equal thickness regions and all abrupt thickness regions in a continuous peening path.
The numbering in the figures illustrates: 1 wallboard, 2 equal thickness area, 3 thickness abrupt change area, 4 test piece, 5 centre gripping frock, 6 peening routes.
Detailed Description
Referring to the drawings, the chord-wise shot-peening forming method of the wallboard with the thickness abrupt change region is applied to the wallboard 1, wherein the wallboard comprises the equal thickness region 2 and the thickness abrupt change region 3, and the thickness of the thickness abrupt change region 3 is larger than that of the equal thickness region 2 of the wallboard. The method requires shot blasting parameters required by the required shape curvature of the constant thickness area formed by the known wallboard: shot type ρ, shot distance l, shot flow rate f, shot pressure p, shot velocity v1 to v2 (specific velocity v is selected according to the chord-wise profile curvature of each region). The method comprises the following steps:
step 1: manufacturing a chord direction shot blasting prestress flat plate test piece of the wall plate thickness mutation area;
the test piece material is required to be the same as the wallboard material, and the thickness is required to be the same as the thickness of the wallboard thickness abrupt change area. The length direction of the test piece is defined as the chord direction. The length and width of the test piece should meet the curvature measurement requirement of the test piece, and the length of the test piece at least meets the distance between two shot blasting paths. The number of the test pieces meets the data processing requirement, and the purpose of obtaining the chordwise prestress sigma t required by forming the chordwise profile curvature of the thickness mutation area is achieved.
Step 2: designing a shot blasting method of a flat test piece;
the shot blasting parameters of the prestressed flat-plate test piece are the same as the chordwise shot blasting parameters of the thickness area of the wallboard. The appropriate shot velocity v is selected from the range of shot velocities v1 to v2 according to the chord-wise profile curvature of the equal thickness region in the vicinity of the abrupt thickness region.
The shot blasting paths of the test piece must be vertically and uniformly distributed in the length direction of the test piece, and the length direction of the test piece should include at least two shot blasting paths. The shot path spacing should be a fixed value and the first and last shot path to trial width end face distances should be less than half the shot path spacing. The shot path spacing is taken into account the thickness of the abrupt thickness change. The smaller the shot path pitch, the smaller the radius of curvature that is formed.
And determining a plurality of test pieces a, b, c according to the shot blasting parameters of the test pieces and the thicknesses of the thickness abrupt change areas. . . . . . x applies chordwise prestressing forces sigma 1MPa, sigma 2MPa, sigma 3MPa respectively. . . . . . Sigma xMPa. Requiring σ1< σ2< σ3.. . . . . σx. And the range of experience [ sigma 1, sigma x ] can contain possible prestress values for shaping the profile curvature of the thickness jump with the shot peening parameters of the test piece. When the prestressing force is applied, the middle part of the inner surface of the test piece is applied, and meanwhile, the two ends of the outer surface of the test piece are applied, so that the test piece is pre-bent into a single curved surface (when the outer surface is measured, the chord curvature is larger than 0, and the spanwise curvature is approximately equal to 0).
In summary, the experiment requires prestressing in the chordwise directions σ1MPa, σ2MPa, σ3MPa, with shot type ρ, shot distance l, shot flow f, shot pressure p, shot velocity v. . . . . . In the σxMPa state, the test pieces a, b, c and c were subjected to the shot blasting paths. . . . . . And (3) shot blasting is carried out on the outer surface of the X.
Step 3: performing a pre-stress shot blasting test of the test piece, and performing data processing according to the test result to obtain the chord pre-stress of the thickness mutation area;
and measuring the initial chord-wise profile curvature radius on the outer surface of the test piece before the test, and measuring the chord-wise profile curvature radius on the outer surface of the test piece after the test piece is subjected to the prestress shot blasting test, wherein the chord-wise profile curvature radius is obtained by subtracting the initial chord-wise profile curvature radius from the outer surface of the test piece. A linear equation r=kσ+λ between the chordwise prestressing force and the shot-formed chordwise radius of curvature is fitted. And when parameters are shot type rho, shot blasting distance l, shot flow f, shot blasting pressure p and shot blasting speed v, the chordwise prestress sigma t required by the chordwise profile curvature of the thickness mutation area is formed.
If a plurality of thickness abrupt change areas exist on the wallboard, determining chordwise shot blasting parameters and chordwise prestress of each thickness abrupt change area in the steps 1 to 3.
Step 4: and designing chordwise shot peening paths continuously passing through the equal-thickness areas and the thickness abrupt change areas of the wall plates and the shot peening speeds of the paths.
The integral chord direction shot blasting parameters are determined by shot type ρ, shot distance l, shot flow f, shot pressure p, and shot velocity v 1-v 2. The wall plate integral chord direction shot blasting parameter design and the shot blasting path design have mature methods, and the patent still adopts the traditional method, and the description is omitted here. It should be noted that in designing the chordwise shot peening path of the panel, the path of the abrupt thickness change region and the surrounding equal thickness regions should be continuous. The shot peening speed V of the thickness abrupt region is determined, and the other regions are required to select an appropriate shot peening speed from V1 to V2 according to the thickness and curvature thereof. The shot peening path pitch of the thickness abrupt region should be the same as the shot peening path of the flat panel test piece.
Step 5: after pre-bending the wall thickness abrupt change region 3, wall chord direction shot blasting is performed.
And (3) pre-bending and clamping the thickness abrupt change area of the wallboard according to the chord direction prestress of the thickness abrupt change area determined in the step (3). And (3) performing chordwise shot blasting on the thickness areas and the thickness abrupt change areas of the wall plate and the like according to the shot blasting path and the shot blasting parameters in the step (4) through continuous shot blasting paths. The chord-wise profile curvature of the thickness abrupt region and the equal thickness region can be formed at one time.
The method is specifically described with respect to chordwise shot-peening of the panel of FIG. 1. The present embodiments are merely illustrative of specific embodiments of the present method and should not be construed as limiting the application of the method.
The profile of the wall panel 1 is as follows: the wallboard is made of 2024-T351 aluminum alloy, the size is 4500mm multiplied by 950mm, the thickness of the equal thickness area 2 (except for the thickness abrupt change area) is 7mm, the whole wallboard is in a biconvex shape, the chord curvature radius is 7-10 m, and the spanwise curvature is 400m. One of the abrupt thickness regions 3 has a size of 340mm×90mm, a thickness of about 12mm, and a chordwise curvature radius of about 8m. The thickness abrupt change region 3 is only abrupt in thickness, and the curvature of the outline is the same as that of the surrounding equal thickness region 2. The steps 1 to 5 only specifically describe the chordwise shot blasting parameters and the chordwise prestress design method of the thickness abrupt region 3, and the design methods of the remaining thickness abrupt regions are similar to those described herein without redundancy.
The thickness of the equal thickness zone 2 of the wallboard is 7mm, the chord curvature radius is 7-10 m, and the following shot blasting parameters are selected for equal thickness zone shot blasting according to the past 2024-T351 aluminum alloy wallboard shot blasting forming experience: APB1/8 carburized steel shot, shot blasting distance of 500mm, shot blasting flow of 8Kg/min, shot blasting pressure of 0.16MPa and shot blasting speed of 5-10 m/min.
Step 1: manufacturing a panel thickness abrupt change region 3 chordwise shot blasting prestress flat plate test piece;
the thickness of the wall plate thickness abrupt change region 3 is 12mm, and the material is 2024-T351 aluminum alloy. Considering curvature measurement by using a curvature meter with a span of 200, and the shot blasting path pitch was 80mm, three 2024-T351 aluminum alloy test pieces a, b, and c were designed with a length, width, and thickness of 200mm×220mm×12mm, respectively.
Step 2: designing a shot blasting method of a flat test piece;
the following shot blasting parameters of the prestress test piece 4 are the same as the wallboard chordwise shot blasting parameters: APB1/8 carburized steel shot, shot blasting distance of 500mm, shot flow of 8Kg/min and shot blasting pressure of 0.16MPa. Since the chord-wise profile curvature of the equal thickness region in the vicinity of the thickness abrupt region is 7.3 to 8.8, the shot blast speed of the thickness abrupt region is selected to be 6m/min from the range of 5 to 10m/min. The chord-wise prestress applied by the test pieces a, b and c is selected to be 18MPa, 12MPa and 6MPa respectively.
The pre-stress test piece 4 applies chordwise pre-stress through the clamping tool 5, and as shown in fig. 2, the outer surface of the test piece is shot-blasted in an expected shot-blasting path under the chordwise pre-stress clamping state of the test piece.
Step 3: performing a pre-stress shot blasting test of the test piece, and performing data processing according to the test result to obtain the chord pre-stress of the thickness mutation area;
because it is difficult to directly measure the prestressing force, the prestressing force is indirectly measured by measuring the chord wise camber of the test piece after the prestressing force is applied. According to the material characteristics and the structure of the curvature instrument, after the chord-wise prestress applied to 18MPa, 12MPa and 6MPa is calculated, if the curvature instrument with the span of 200mm is used, the chord-wise arc height is required to be measured to be about: 0.63mm, 0.42mm, 0.21mm. The measurement of the radius of curvature of the chordwise profile is also indirectly measured by measuring the camber of the outer surface.
The initial chordwise camber before peening is measured on the outer surface of the test piece before the test. And (3) respectively shot blasting the outer surfaces of the test pieces a, b and c according to the parameters in the step 2 under the prestress state. After the test piece prestress shot blasting test is carried out, the chord direction arc height after shot blasting is measured on the outer surface of the test piece, and the chord direction shot blasting forming arc height of the test piece is obtained by subtracting the chord direction arc height. The test measurement data are shown in Table 1.
Fitting a linear equation (R= -362 sigma + 12787) according to the chordwise prestressing and chordwise shot forming radius of curvature (scatter plot linear equation fitting of experimental results is shown in figure 3). Bringing r=7.5 m into equation one yields σ=14.6 MPa.
TABLE 1 prestressed shot-peening test results
To sum up, the shot blasting parameters of the thickness mutation zone 3 are as follows: APB1/8 carburized steel shot, shot blasting distance of 500mm, shot flow of 8Kg/min, shot blasting pressure of 0.16MPa and shot blasting speed of 6m/min. The chordwise prestress to be applied is 14.6MPa. And (3) repeating the steps 1-3 to obtain the shot blasting speeds of other thickness abrupt change areas of 6m/min, 10m/min and 10m/min respectively, wherein the chord direction prestress to be applied is 8.7MPa, 10.5MPa and 12.4MPa respectively.
Step 4: and designing integral chord direction shot blasting parameters and shot blasting paths which are suitable for the chord direction shot blasting forming parameters of the thickness mutation areas.
The integral chord direction shot blasting parameters are as follows: APB1/8 carburized steel shot, shot blasting distance of 500mm, shot flow of 8Kg/min, shot blasting pressure of 0.16MPa and shot blasting speed of 5-10 m. And designing a wallboard chord direction shot blasting path and specific shot blasting speeds of each path according to the thickness of the equal thickness area and the chord direction outline curvature of each area. In fig. 4, a wall plate structure is schematically shown by a broken line, a solid line shows a shot path 6, and the shot path 6 is marked with shot velocity of the path.
In the embodiment, four thickness abrupt change areas are arranged, the required chordwise prestress of 14.6MPa, 8.7MPa, 10.5MPa and 12.4MPa is respectively applied to each thickness abrupt change area, and then the chordwise shot blasting is carried out on the outer surface (the surface without stringers is the outer surface) of the wallboard 1 according to the shot blasting path 6 and the shot blasting speed shown in the attached figure 4 by using carburized steel shots APB1/8 and with the shot blasting distance of 500mm, the shot blasting flow of 8Kg/min and the shot blasting pressure of 0.16MPa, so that the chordwise outline curvature of the wallboard can be formed at one time.
Claims (4)
1. A chordwise shot peening method for a wallboard comprising a thickness abrupt change region, the wallboard comprising an equal thickness region and a thickness abrupt change region, the thickness of the thickness abrupt change region of the wallboard being greater than the thickness of the equal thickness region, shot peening parameters of the equal thickness region of the wallboard being known, the method comprising the steps of: 1) Manufacturing a sufficient wallboard thickness abrupt change area chordwise shot blasting prestress flat plate test piece, wherein the thickness of the test piece is consistent with the wallboard thickness abrupt change area, the length direction of the test piece is consistent with the chordwise direction of the wallboard, the length and the width of the test piece are required to meet the curvature measurement requirement of the test piece, the length of the test piece at least meets the distance between two shot blasting paths, and the test piece is the same as the wallboard material; 2) Designing a flat plate test piece shot blasting test method, wherein shot blasting parameters of a pre-stress flat plate test piece are the same as chord direction shot blasting parameters of a thickness area such as a wallboard, shot blasting paths of the test piece are required to be perpendicular and uniformly distributed in the length direction of the test piece, the length direction of the test piece at least comprises two shot blasting paths, chord direction pre-stressing is determined to be applied to the test piece according to the shot blasting parameters of the test piece and the thickness of a thickness mutation area, when the pre-stressing is applied, the middle part of the inner surface of the test piece is applied, meanwhile, the two ends of the outer surface of the test piece are applied, and the test piece is pre-bent into a single curved surface; 3) Performing a pre-bending clamping shot blasting test on the test pieces, respectively applying pre-stresses of different magnitudes on a plurality of identical test pieces to perform chordwise pre-bending clamping, respectively performing shot blasting test on the test pieces by using process parameters selected from the shot blasting process parameter range of the equal thickness region, performing chordwise curvature measurement on the test pieces after shot blasting, and obtaining proper clamping pre-stresses of the wallboard thickness abrupt change region according to the test results; 4) Designing chordwise shot blasting paths and specific shot blasting parameters continuously passing through the equal-thickness areas and the thickness abrupt change areas of the wall plates; 5) And 3) pre-bending and clamping the thickness abrupt change region of the wallboard according to the clamping prestress of the thickness abrupt change region obtained in the step 3), and performing chordwise shot blasting on the thickness region of the wallboard and the thickness abrupt change region by adopting shot blasting process parameters of the thickness region of the wallboard and the thickness abrupt change region in a continuous shot blasting path.
2. The method for forming a wall plate with abrupt thickness change zones according to claim 1, wherein the wall plate comprises a plurality of abrupt thickness change zones, test pieces and pre-bending clamping shot blasting tests are respectively manufactured corresponding to each abrupt thickness change zone, clamping prestress of each abrupt thickness change zone is respectively obtained, the corresponding clamping prestress is respectively adopted for carrying out pre-bending clamping on each abrupt thickness change zone during wall plate shot blasting, and then the equal thickness zones and all abrupt thickness change zones of the wall plate are subjected to chordwise shot blasting in a continuous shot blasting path by adopting shot blasting process parameters of the equal thickness zones of the wall plate.
3. The method for chordwise shot-peening a panel having a thickness jump region according to claim 1, wherein the shot-peening paths are vertically and uniformly distributed in a longitudinal direction of the test piece when the pre-bending grip shot-peening test of the test piece is performed, and the longitudinal direction of the test piece includes at least two shot-peening paths.
4. The method for forming a wall plate with abrupt thickness change according to claim 1, wherein the plurality of test pieces after the shot blasting are subjected to the measurement of the chordwise curvature to obtain the linear relationship between the chordwise prestress and the chordwise curvature radius after the shot blasting, and the chordwise prestress corresponding to the target curvature radius is selected as the clamping prestress of the abrupt thickness change.
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