CN118238435A - Complementary shaping method - Google Patents
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- CN118238435A CN118238435A CN202410428508.5A CN202410428508A CN118238435A CN 118238435 A CN118238435 A CN 118238435A CN 202410428508 A CN202410428508 A CN 202410428508A CN 118238435 A CN118238435 A CN 118238435A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000000295 complement effect Effects 0.000 title claims abstract description 16
- 238000007493 shaping process Methods 0.000 title claims description 7
- 230000008439 repair process Effects 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000013519 translation Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 abstract description 18
- 230000008023 solidification Effects 0.000 abstract description 18
- 238000002715 modification method Methods 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 10
- 239000002131 composite material Substances 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 230000001808 coupling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Finishing Walls (AREA)
Abstract
The invention discloses a complementary modification method. The method adopts an orthogonal complementary strategy, suppresses rebound deformation of the stringer in the vertical axial direction through rebound compensation, suppresses buckling deformation of the reinforced wallboard in the stringer axial direction through mold compensation, and greatly reduces solidification deformation of the reinforced wallboard through coupling of the two.
Description
Technical Field
The invention relates to the field of manufacturing of composite material parts (components), in particular to a complementary modification method.
Background
The reinforced composite wall plate is widely applied to the positions of wings, tail wings and the like of an aircraft. The composite material has the anisotropic property, the complex layering structure of the reinforced wallboard and other factors, which jointly lead the reinforced wallboard to present complex hyperbolic solidification deformation.
The existing methods for inhibiting the solidification deformation of the reinforced wallboard mainly comprise 2 types: 1) Narrowing the process window of temperature rise and temperature reduction speed and the like, and reducing the difference of curing stress in the reinforced wallboard; 2) And the mold repair compensation measures are adopted to reduce the solidification deformation of the reinforced wallboard.
The method of class 1 increases the difficulty of control of the manufacturing process, prolongs the curing cycle, and even affects the overall performance of the reinforced wallboard. The 2 nd method can effectively relieve the solidification deformation of the reinforced wallboard.
The patent (CN 202210748618.0) discloses a profile compensation control method for a T-shaped part made of a composite material, which is used for reducing the solidification deformation of a reinforced wallboard by compensating the rebound deformation of a T-shaped stringer. The patent 'mould compensation method for the solidification deformation of the reinforced wallboard' (CN 202311270504.0) inhibits the solidification deformation by compensating the solidification mould of the reinforced wallboard. That is, the existing method splits the stiffened panel into 2 relatively independent parts of the stringer and the skin, and the coupling effect of the stringer and the skin is not fully considered, so that the compensation process is complex and the actual effect is poor.
Therefore, a complementary modification method is urgently needed, the curing deformation of the stringers and the skins and the coupling effect of the stringers and the skins are fully considered, the process is simplified, and the inhibiting effect on the curing deformation of the reinforced wallboard is improved.
Disclosure of Invention
The invention discloses a complementary modification method. The method comprehensively considers the solidification deformation of the stringer and the skin and the coupling effect of the stringer and the skin, adopts an orthogonal complementation strategy, suppresses the rebound deformation of the stringer in the vertical axial direction through rebound compensation, suppresses the buckling deformation of the reinforced wallboard in the axial direction of the stringer through mold compensation, and realizes the complementation of the two, thereby greatly reducing the solidification deformation of the reinforced wallboard. The method is simple and efficient, and can effectively inhibit the solidification deformation of the reinforced wallboard.
A complementary shaping method, the shaping section of stringer and skin are perpendicular to each other, comprising the following steps:
1, in the thickest area of each stringer, cutting a section along the axial direction of the stringer, extending the non-glued bottom edge towards the stud, extending the non-involuted stud towards the bottom edge, intersecting the two at a point P 1 to form a theoretical included angle theta 0, fixing the non-involuted stud surface by taking the point P 1 as the center, rotating the non-glued bottom edge surface in the opposite direction of the rebound deformation of the stringer until an included angle theta 1 is formed by the non-involuted stud surface, wherein the rotating angle of the non-glued bottom edge surface is theta, namely theta= |theta 0－θ1 |, and theta is taken as the compensation angle of rebound deformation of the stringer curing mold, and theta=theta 0/Tmax+1/Rmax, wherein T max is the highest curing temperature, and R max is the maximum R value at the outer side of the stringer;
2, extending all stringers of the reinforced wallboard to two sides along the stringer axis until the stringers are equal to the two ends of the skin, selecting the stringer with the longest length after extension, cutting the skin of the reinforced wallboard by the stringer axis of the stringer, connecting the end points P 2、P3 at two sides of the skin at the section to form a straight line L 1, translating the straight line L 1, Tangent to the skin cross-section at point P 4, perpendicular L 2 to L 1 from P 4 intersects straight line L 1 at point P 5, Translation of the straight line L 1 along the vertical line L 2 in the opposite direction of the buckling deformation of the reinforced wall plate at the section to form a straight line L 1 ', intersecting the perpendicular L 2 at point P 5 ', the endpoints on both sides of the skin become the distance D between P 2 '、P3 ',P5 and P 5 ', D=h max/Rmax+2(W1+W2)/W3, where H max is the maximum selected stringer thickness, W 1 is the selected stringer stud reference height, W 2 is the selected stringer single side bottom edge reference width, W 3 is the maximum value of the distance between the selected stringer and two adjacent stringers, and a new skin profile curve at the axis of the selected stringer is constructed by taking P 2 '、P3 ' and P 4 as references;
3, constructing a new skin profile curve at all stringer axes according to the step 1-2;
4, constructing a new skin curved surface by taking the new skin section curves at all stringer axes as references according to the steps 1-3;
and 5, designing a die required by curing the reinforced wallboard by taking the new skin curved surface as a reference according to the steps 1-4.
Step 1 and steps 2 to 5 may be parallel.
To simplify the process, all stringers may be subjected to a uniform compensation angle for rebound deflection, where θ 0 is the maximum theoretical angle for all stringers in the stiffened panel and R max is the maximum outboard R for all stringers in the stiffened panel.
To simplify the process, a uniform translation distance D may be used at all stringer axial profiles, where H max is the maximum thickness of all stringers, W 1 is the maximum height of the stud reference of all stringers, W 2 is the maximum width of the single side bottom edge reference of all stringers, and W 3 is the maximum spacing of any two stringers adjacent to each other.
The compensation angle of the rebound deformation of the non-glued face stringer mould is the average value of the compensation angles of the rebound deformation of the glued face.
The complementary modification method of the invention has the following advantages: 1) The correction compensation of the stringers and the skins is simple and efficient, only one direction is considered, and the calculated amount is greatly reduced; 2) The method has the advantages that the orthogonal complementation strategy is adopted, the rebound deformation of the stringers in the vertical axial direction and the buckling deformation of the reinforced wallboard in the axial direction of the stringers are respectively restrained, the two are in orthogonal coupling, the curing deformation of the reinforced wallboard is greatly reduced, and the effect of half effort is achieved; 3) Unified parameters can be adopted to further simplify the modification process.
Drawings
FIG. 1T-shaped stiffened wall panel schematic view
FIG. 2T-stringer schematic
FIG. 3 is a schematic diagram of a resilient deformation of a T-stringer
FIG. 4 is a schematic diagram of a repair type stringer
FIG. 5 skin repair compensation schematic diagram
FIG. 6 is a schematic view of an I-shaped stiffened wall panel
The numbering in the figures illustrates: 1-skin, 2-T-stringer, 3-non-apposition stud face, 4-non-glued bottom edge face, 5-intersection point P 1, 6-stringer outside R angle, 7-non-glued bottom edge face after rebound deformation, 8-repair-compensated non-glued bottom edge face, 9-skin side end point P 2, 10-straight line L 1 ', 11-point P 5, 12-straight line L 1, 13-skin side end point P 3, 14-compensated skin side end point P 2', 15-compensated skin side end point P 3 ', 16-new profile curve, 17-perpendicular line L 2, 18-point P 4, 19-point P 5', 20-I-stringer.
Detailed Description
The curing deformation of the stiffened panel is caused by the stringers, skin, and the coupling of the two. Due to the complexity of the structure and the layering, the reinforced wallboard presents hyperbolic solidification deformation, and the profile precision of the reinforced wallboard is affected.
In the industry, technical measures or mould repair compensation methods are generally adopted to inhibit the solidification deformation of the reinforced wallboard.
The technological measures are mainly to reduce the curing residual stress of the reinforced wallboard and the difference of the curing residual stress among all areas by reducing the rising and falling speeds, adjusting the layering structure and the like, so as to further relieve the curing deformation. However, narrowing the process window lengthens the history of the composite material at high temperatures, reducing the overall performance of the reinforced wallboard. Adjusting the layering structure can reduce the bearing efficiency of the reinforced wallboard and improve the weight. Moreover, the effect of the technological measures on inhibiting the solidification deformation of the reinforced wallboard is not obvious.
The mold repair compensation method replaces the theoretical molded surface with the non-theoretical molded surface, and develops the mold design. After solidification, the composite material part is deformed from the non-theoretical molded surface to the theoretical molded surface, so that the aim of improving the appearance accuracy is fulfilled. The mold shaping compensation method is adopted, and the core is the construction of a non-theoretical molded surface. For reinforced panels, it is common practice to compensate for the resilient deformation of the stringers, or for the overall deformation of the reinforced panel.
The reinforced wall plate consists of stringers and a skin, which are cured and deformed by themselves, and coupled to produce complex hyperbolic deformations. Therefore, only the deformation of the stringers or skin is suppressed, and the effect is limited. The final solidification deformation is directly used as a reference, the construction process of the non-theoretical molded surface is extremely complicated, and the accuracy is not high.
The application adopts an orthogonal complementary strategy, and adopts relatively independent repair compensation measures in the axial direction of the vertical stringer and the axial direction (2 orthogonal directions) of the stringer respectively. In the axial direction of the vertical stringers, the resilient deformation of the stringers is primarily inhibited. In the axial direction of the stringers, buckling deformation of the stiffened wall panel is mainly inhibited. The 2 orthogonal directions are respectively coupled with each other by the stressed repair compensation, so that the aim of integrally inhibiting the solidification deformation of the reinforced wallboard is fulfilled.
And 2 orthogonal directions are all estimated compensation parameters based on structural features of the workpiece, and a test piece is not required to be manufactured. To further simplify the process, 2 orthogonal directions can all adopt respective unified parameters, and the implementation process is efficient.
The invention is shown in fig. 1-6:
Example 1T-shaped reinforced wallboard
The application takes a T-shaped reinforced wallboard as an example, and discloses a complementary modification method.
1 In the thickest area of each stringer 2, a section is arbitrarily cut along the axial direction of the stringer, the non-glued bottom edge surface 4 is prolonged towards the direction of the stud, the non-involuted bottom edge surface 3 is prolonged towards the direction of the bottom edge, the two are intersected at a point P 1 to form a theoretical included angle theta 0, the non-involuted bottom edge surface 3 is fixed by taking the point P 1 as the center, the non-glued bottom edge surface 4 is rotated towards the opposite direction of the rebound deformation of the stringer until an included angle theta 1 is formed by the non-involuted bottom edge surface 3, the rotation angle of the non-glued bottom edge surface 4 is theta, namely theta= |theta 0－θ1 | and theta is taken as the compensation angle of rebound deformation of a curing mould of the stringer, and theta = theta 0/Tmax+1/Rmax, wherein T max is the highest curing temperature, and R max is the maximum R value on the outer side of the stringer.
2 Extending all stringers 2 of the stiffened wall panel to two sides along the stringer axis until the stringers are equal to the two ends of the skin 1, selecting the stringer with the longest length after extension, cutting the skin 1 of the stiffened wall panel by the stringer axis of the stringer, connecting the end points P 29、P3 at two sides of the skin at the section to form a straight line L 1, translating the straight line L 1, Tangent to the section of the skin, the tangent point is P 4, the perpendicular L 2 of L 1 is made by P 4 18, Intersecting the straight line L 1 12 at a point P 5, translating the straight line L 1 along the vertical line L 2 in a direction opposite to the buckling deformation of the reinforced wall plate at the section, forming a straight line L 1 '10 intersecting the perpendicular line L 2 at a point P 5 '19, the end points on both sides of the skin becoming the distance D between P 2'14、P3'15,P5 and P 5 '19, D=h max/Rmax+2(W1+W2)/W3, where H max is the maximum selected stringer thickness, W 1 is the selected stringer stud reference height, W 2 is the selected stringer single side bottom edge reference width, W 3 is the maximum value of the spacing between the selected stringer and two adjacent stringers, and a new skin profile curve at the axis of the selected stringer is constructed based on P 2'14、P3' 15 and P 4.
3 A new skin profile curve is constructed at all stringer axes, as per step 2.
And 4, constructing a new skin curved surface by taking the new skin section curves at all stringer axes as references according to the step 3.
And 5, designing a die required for curing the reinforced wallboard by taking the new skin curved surface as a reference according to the step 4.
Step 1 and steps 2 to 5 may be parallel.
Example 2T-shaped reinforced wallboard
The application takes a T-shaped reinforced wallboard as an example, and discloses a complementary modification method.
1 In the thickest area of each stringer 2, a section is arbitrarily cut along the axial direction of the stringer, the non-glued bottom edge surface 4 is prolonged towards the direction of the stud, the non-involuted bottom edge surface 3 is prolonged towards the direction of the bottom edge, the two are intersected at a point P 1 to form a theoretical included angle theta 0, the non-involuted bottom edge surface 3 is fixed by taking the point P 1 as the center, the non-glued bottom edge surface 4 is rotated towards the opposite direction of the rebound deformation of the stringer until an included angle theta 1 is formed by the non-involuted bottom edge surface 3, the rotation angle of the non-glued bottom edge surface 4 is theta, namely theta= |theta 0－θ1 |, theta is taken as the compensation angle of rebound deformation of a stringer curing mould of the stringer, theta = theta 0/Tmax+1/Rmax, wherein theta 0 is the largest theoretical included angle in all stringers of the reinforced wallboard, T max is the highest curing temperature, and R max is the largest outside R of all stringers of the reinforced wallboard.
2 Extending all stringers 2 of the stiffened wall panel to two sides along the stringer axis until the stringers are equal to the two ends of the skin 1, selecting the stringer with the longest length after extension, cutting the skin 1 of the stiffened wall panel by the stringer axis of the stringer, connecting the end points P 29、P3 at two sides of the skin at the section to form a straight line L 1, translating the straight line L 1, Tangent to the section of the skin, the tangent point is P 4, the perpendicular L 2 of L 1 is made by P 4 18, Intersecting the straight line L 1 12 at a point P 5, translating the straight line L 1 along the vertical line L 2 in a direction opposite to the buckling deformation of the reinforced wall plate at the section, forming a straight line L 1 '10 intersecting the perpendicular line L 2 at a point P 5 '19, the end points on both sides of the skin becoming the distance D between P 2'14、P3'15,P5 and P 5 '19, d=h max/Rmax+2(W1+W2)/W3, where H max is the maximum of the thickness in all stringers, W 1 is the maximum of the stud reference height in all stringers, W 2 is the maximum of the stud reference height in all stringers, The maximum value of the reference width of the single side bottom edge, W 3 is the maximum value of the distance between any two adjacent stringers, and a new skin profile curve at the selected stringer axis is constructed by taking P 2'14、P3' 15 and P 4 as references.
3 A new skin profile curve is constructed at all stringer axes, as per step 2.
And 4, constructing a new skin curved surface by taking the new skin section curves at all stringer axes as references according to the step 3.
And 5, designing a die required for curing the reinforced wallboard by taking the new skin curved surface as a reference according to the step 4.
Step 1 and steps 2 to 5 may be parallel.
Example 3I-shaped reinforced wallboard
The application takes an I-shaped reinforced wallboard as an example, and discloses a complementary modification method.
1 In the thickest area of each stringer 20, a section is arbitrarily cut along the axial direction of the stringer, the non-glued bottom edge surface 4 is prolonged towards the direction of the stud, the non-involuted bottom edge surface 3 is prolonged towards the direction of the bottom edge, the two are intersected at a point P 1 to form a theoretical included angle theta 0, the non-involuted bottom edge surface 3 is fixed by taking the point P 1 as the center, the non-glued bottom edge surface 4 is rotated towards the opposite direction of the rebound deformation of the stringer until an included angle theta 1 is formed by the non-involuted bottom edge surface 3, the rotation angle of the non-glued bottom edge surface 4 is theta, namely theta= |theta 0－θ1 | and theta is taken as the compensation angle of rebound deformation of a curing mould of the stringer, and theta = theta 0/Tmax+1/Rmax, wherein T max is the highest curing temperature, and R max is the maximum R value on the outer side of the stringer.
2 For the non-glued joint surface of the I-shaped stringer, the compensation angle of the rebound deformation of the stringer curing mold is the average value of the compensation angles of the rebound deformation of the glued joint surface, namely theta= (theta Left side +θ Right side )/2, wherein theta Left side is the compensation angle of the rebound deformation of the stringer curing mold at the left side of the glued joint surface, and theta Right side is the compensation angle of the rebound deformation of the stringer curing mold at the right side of the glued joint surface.
3 Extending all stringers 20 of the stiffened wall panel to two sides along the stringer axis until the stringers are equal to the two ends of the skin 1, selecting the stringer with the longest length after extension, cutting the skin 1 of the stiffened wall panel by the stringer axis of the stringer, connecting the end points P 29、P3 at two sides of the skin at the section to form a straight line L 1, translating the straight line L 1, Tangent to the section of the skin, the tangent point is P 4, the perpendicular L 2 of L 1 is made by P 4 18, Intersecting the straight line L 1 12 at a point P 5, translating the straight line L 1 along the vertical line L 2 in a direction opposite to the buckling deformation of the reinforced wall plate at the section, forming a straight line L 1 '10 intersecting the perpendicular line L 2 at a point P 5 '19, the end points on both sides of the skin becoming the distance D between P 2'14、P3'15,P5 and P 5 '19, D=h max/Rmax+2(W1+W2)/W3, where H max is the maximum selected stringer thickness, W 1 is the selected stringer stud reference height, W 2 is the selected stringer single side bottom edge reference width, W 3 is the maximum value of the spacing between the selected stringer and two adjacent stringers, and a new skin profile curve at the axis of the selected stringer is constructed based on P 2'14、P3' 15 and P 4.
4A new skin profile curve is constructed at all stringer axes as per step 2.
And 5, constructing a new skin curved surface by taking the new skin section curves at all stringer axes as references according to the step 3.
And 6, designing a die required for curing the reinforced wallboard by taking the new skin curved surface as a reference according to the step 4.
Step 1 and steps 2 to 5 may be parallel.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. A complementary shaping method is characterized in that shaping sections of stringers and skins are perpendicular to each other, and the method comprises the following steps:
1-1, in the thickest area of each stringer, cutting a section along the axial direction of the stringer, extending the non-glued bottom edge towards the stud, extending the non-involuted stud towards the bottom edge, intersecting the two at a point P 1 to form a theoretical included angle theta 0, fixing the non-involuted stud surface by taking the point P 1 as the center, rotating the non-glued bottom edge surface in the opposite direction of the rebound deformation of the stringer until an included angle theta 1 is formed by the non-involuted stud surface, wherein the rotating angle of the non-glued bottom edge surface is theta, namely theta= |theta 0－θ1 |, and theta is used as a compensation angle of rebound deformation of a stringer curing mold, and theta=theta 0/Tmax+1/Rmax, wherein T max is the highest curing temperature, and R max is the maximum R value at the outer side of the stringer;
1-2 extending all stringers of the stiffened panel along the stringer axis to both sides until the stringers are equal to the two ends of the skin, selecting the stringer with the longest length after extension, slitting the skin of the stiffened panel by the stringer axis of the stringer, connecting the end points P 2、P3 on both sides of the skin at the section to form a straight line L 1, translating the straight line L 1, Tangent to the skin cross-section at point P 4, perpendicular L 2 to L 1 from P 4 intersects straight line L 1 at point P 5, Translation of the straight line L 1 along the vertical line L 2 in the opposite direction of the buckling deformation of the reinforced wall plate at the section to form a straight line L 1 ', intersecting the perpendicular L 2 at point P 5 ', the endpoints on both sides of the skin become the distance D between P 2 '、P3 ',P5 and P 5 ', D=h max/Rmax+2(W1+W2)/W3, where H max is the maximum selected stringer thickness, W 1 is the selected stringer stud reference height, W 2 is the selected stringer single side bottom edge reference width, W 3 is the maximum value of the distance between the selected stringer and two adjacent stringers, and a new skin profile curve at the axis of the selected stringer is constructed by taking P 2 '、P3 ' and P 4 as references;
1-3 according to step 1-2, constructing a new skin profile curve at all stringer axes;
1-4 according to step 1-3, constructing a new skin curved surface by taking the new skin section curves at all stringer axes as references;
1-5 according to step 1-4, designing a mould required by curing the reinforced wallboard by taking the new skin curved surface as a reference.
2. The method of claim 1, wherein steps 1-1 and steps 1-2 to 1-5 are performed in parallel.
3. A complementary repair method according to claim 1, wherein for simplicity, all stringers may be subjected to a uniform compensation angle for springback deformation, where θ 0 is the maximum theoretical angle of all stringers in the stiffened panel and R max is the maximum outer R of all stringers in the stiffened panel.
4. The method of claim 1, wherein for simplicity, a uniform translation distance D is used for all stringer axial profiles, where H max is the maximum thickness of all stringers, W 1 is the maximum height of the stud reference of all stringers, W 2 is the maximum width of the single side bottom edge of all stringers, and W 3 is the maximum spacing between any two stringers.
5. A complementary repair method according to claim 1, wherein the compensation angle for the rebound deformation of the non-bonded face stringer is the average of the compensation angles for the rebound deformation of the bonded face.
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