Strengthening edge detection and orthopedic method

Abstract

The application discloses a kind of detection and orthopedic methods of reinforcing edge, the reinforcing edge is used to reinforce the fan blade of aero-engine, the detection and orthopedic methods of the reinforcing edge include S1, the detection of the reinforcing edge is designed with conformal punch;S2, the size of the reinforcing edge is determined on the angle;S3, according to the upper tolerance and lower tolerance of the blade profile tolerance band of the reinforcing edge, the first orthopedic conformal punch and the second orthopedic conformal punch of the reinforcing edge are designed;S4, according to the size of the angle, the first orthopedic conformal punch or second orthopedic conformal punch is selected to be orthopedic.Conformal mould makes the inner and outer profile of reinforcing edge accurate orthopedic, which is conducive to improving the subsequent reinforcing edge and blade cementing quality, and maintaining good consistency and stability.This method can repair the inner cavity profile of the formed reinforcing edge that does not meet the requirements, solve the problem of high manufacturing cost and long manufacturing cycle of the current reinforcing edge, save manufacturing cost, and improve product qualification rate.

Description

Technical Field

[0001] This invention relates to a method for detecting and correcting reinforced edges. Background Technology

[0002] Currently, the composite material fan blades used are mainly resin-based composite material fan blades. As one of the key components of high-bypass turbofan engines, they effectively reduce the weight of aero engines and meet the requirements of "low noise, low pollution, and low cost" for the next generation of commercial aero engines. However, resin-based composite materials are less resistant to bird strikes, erosion, and corrosion than metals, and are prone to cracking and delamination during high-speed rotation. In particular, under high-speed impact from birds, the leading edge of the fan blade will undergo significant deformation, far exceeding the deformation range that composite materials can withstand. Currently, aero-engine companies use reinforced edges to protect the composite material fan blades to improve their bird strike resistance.

[0003] The development of reinforcing edges for composite fan blades in China is still in its early stages. Due to the large length of the leading edge reinforcing edge, its double thin-walled curved surface structure, deep and narrow cavity, and high degree of torsion, coupled with stringent requirements for dimensional tolerances, form and position tolerances, and surface roughness, the processing of the reinforcing edge presents new challenges. Furthermore, the reinforcing edge needs to be bonded to the composite fan blade; if the inner cavity contour of the reinforcing edge does not match the blade size, defects such as delamination, glue leakage, and uneven bonding can occur. These defects can pose significant safety hazards after a bird strike, and given the narrow length and high degree of torsion, there are currently no suitable methods for detecting and correcting the inner surface of the reinforcing edge. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the problem that the reinforcing edge cannot be effectively detected and corrected in the prior art, and to provide a method for detecting and correcting the reinforcing edge.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A method for detecting and correcting a reinforcing edge, the reinforcing edge being used to reinforce fan blades of an aero-engine, the method comprising:

[0007] S1. Design a conformal punch for detecting the reinforcing edge;

[0008] S2. Measure the size of the angle subtended on the reinforcing edge;

[0009] S3. Based on the upper and lower tolerances of the leaf-shaped tolerance zone of the reinforcing edge, design the first and second straightening conformal punches for the reinforcing edge accordingly.

[0010] S4, according to the size of the opening angle, selecting the first orthopedic conforming punch or the second orthopedic conforming punch to perform orthopedic.

[0011] In the technical solution, the detection conforming punch is used to solve the problem that the inner cavity of the reinforcing edge is complex in shape and difficult to detect. Meanwhile, the conforming die makes the inner and outer surfaces of the reinforcing edge accurate, which is beneficial to improve the subsequent reinforcing edge and blade cementing quality, and maintain good consistency and stability. This method can repair the sample of the reinforcing edge inner cavity profile that does not meet the requirements, solve the problem of high manufacturing cost and long manufacturing cycle of the reinforcing edge, save the manufacturing cost, and improve the product qualification rate.

[0012] Preferably, in step S2, the size of the opening angle on the reinforcing edge is measured by using a plug gauge.

[0013] In the technical solution, the plug gauge is used to measure the size of the opening angle, which is simple and direct.

[0014] Preferably, in step S1, the detection conforming punch is designed in sections according to the curved surface shape of the reinforcing edge.

[0015] In the technical solution, the detection conforming punch is designed in sections, which can reduce the manufacturing difficulty and the assembly difficulty, and is convenient for subsequent replacement and repair of the conforming punch.

[0016] Preferably, in step S2, the size of the opening angle on the reinforcing edge corresponding to each section of the detection conforming punch is measured.

[0017] In the technical solution, the opening angle on the reinforcing edge corresponding to each section is detected, which is convenient for subsequent operation.

[0018] Preferably, in step S4, according to the size of the opening angle corresponding to each section, the first orthopedic conforming punch or the second orthopedic conforming punch corresponding to each section is selected to perform orthopedic.

[0019] In the technical solution, in step S3, according to the size of the opening angle of the reinforcing edge corresponding to each section of the detection conforming punch, the first orthopedic conforming punch or the second orthopedic conforming punch is selected to perform orthopedic. This method can further improve the accuracy of orthopedic of the reinforcing edge and improve the effect of orthopedic.

[0020] Preferably, in step S4, the local micro-plastic roller forming technology is used to perform orthopedic on the reinforcing edge.

[0021] In the technical solution, the local micro-plastic roller forming technology can form compressive stress on the outer surface of the reinforcing edge, and refine the surface grains and organization, which is beneficial to prevent the initiation of fatigue cracks.

[0022] Preferably, in step S4, the first orthopedic conforming punch and / or the second orthopedic conforming punch is provided with an ejection hole inside.

[0023] In the technical solution, the first orthopedic conforming punch and the second orthopedic conforming punch are provided with ejection holes inside, which facilitates the strengthening rib demolding.

[0024] Preferably, in step S4, the first orthopedic conforming punch or the second orthopedic conforming punch is gradually rolled with the strengthening rib, and after the strengthening rib is completely attached to the first orthopedic conforming punch or the second orthopedic conforming punch, the strengthening rib is demolded from the first orthopedic conforming punch or the second orthopedic conforming punch.

[0025] In the technical solution, the gradual rolling is performed first, then the strengthening rib is completely attached to the first orthopedic conforming punch or the second orthopedic conforming punch, and finally the demolding operation is performed. The plastic deformation of the strengthening rib is reduced, and the orthopedic effect is enhanced.

[0026] Preferably, between steps S1 and S2, step S12 is further included.

[0027] The inner shape tolerance of the strengthening rib is detected, and if the inner shape tolerance meets the set requirements, step S2 is not performed.

[0028] In the technical solution, before orthopedic, the strengthening rib is detected by using the detection conforming punch. If the strengthening rib meets the design requirements, correction is not needed, the process is reduced, and the cost is saved.

[0029] Preferably, after step S4, step S41 is further included.

[0030] The inner shape tolerance of the strengthening rib is detected.

[0031] In the technical solution, after the orthopedic is completed, the strengthening rib is detected again, which can test the orthopedic effect and avoid the use of defective products.

[0032] The positive progress effect of the present application is that:

[0033] The detection conforming punch is used to solve the problem that the inner cavity shape of the strengthening rib is complex and difficult to detect. At the same time, the conforming die enables the inner and outer shape surfaces of the strengthening rib to be accurately orthopedic, which is beneficial to improve the subsequent strengthening rib and blade bonding quality and maintain good consistency and stability. This method can repair the sample piece whose inner cavity profile of the formed strengthening rib does not meet the requirements, solve the problems of high manufacturing cost and long manufacturing cycle of the current strengthening rib, save the manufacturing cost, and improve the product qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a step schematic diagram of an embodiment of the detection and orthopedic method of the strengthening rib of the present application.

[0035] Figure 2 This is a schematic diagram of a conformal punch structure for detection in an embodiment of the method for detecting and correcting the reinforced edge of the present invention.

[0036] Figure 3 This is a schematic diagram showing the positions of the conformal punch for detection and the conformal punch for correction in an embodiment of the method for detecting and correcting the edge of the present invention.

[0037] Figure 4 This is a schematic diagram showing the position of the conformal punch and the reinforcing edge in an embodiment of the method for detecting and correcting the reinforcing edge of the present invention.

[0038] Figure 5 This is a schematic diagram of the ejector hole in an embodiment of the method for detecting and correcting the reinforcing edge of the present invention.

[0039] Explanation of reference numerals in the attached figures

[0040] Strengthening the edge 1

[0041] Conformal punch 2 for testing

[0042] Orthopedic conformal punch 3, first orthopedic conformal punch 31, second orthopedic conformal punch 32

[0043] Ejector Hole 4

[0044] Adhesive layer 5

[0045] Suction surface wall panel 6

[0046] Pressure surface wall panel 7

[0047] Suction roller pressure head 8

[0048] Pressure surface roller head 9

[0049] Base 10 Detailed Implementation

[0050] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0051] like Figure 1 and Figure 2 As shown, this invention discloses a method for detecting and correcting a reinforcing edge 1, which is used to strengthen the fan blades of an aero-engine. The method for detecting and correcting the reinforcing edge 1 includes:

[0052] S1. Design a conformal punch 2 for detecting the reinforcing edge 1;

[0053] S2. Measure the size of the angle on reinforced side 1;

[0054] S3, according to the upper and lower tolerance of the profile tolerance band of the reinforcing edge 1, a first rectification conformal convex die 31 and a second rectification conformal convex die 32 are designed for the reinforcing edge 1;

[0055] S4, according to the size of the opening angle, the first rectification conformal convex die 31 or the second rectification conformal convex die 32 is selected for rectification.

[0056] The reinforcing edge 1 is detected by the conformal convex die 2, which solves the problem that the inner cavity shape of the reinforcing edge 1 is complex and difficult to detect. At the same time, the conformal die makes the inner and outer shapes of the reinforcing edge 1 accurately rectified, which is beneficial to improve the quality of the subsequent reinforcing edge 1 and blade glue layer 5, and maintain good consistency and stability. This method can repair the inner cavity profile of the formed reinforcing edge 1 that does not meet the requirements, solve the problem of high manufacturing cost and long manufacturing cycle of the reinforcing edge 1, save manufacturing cost, and improve product qualification rate. Avoid the inner profile of the reinforcing edge 1 and the blade matching is not suitable, causing problems such as delamination, glue leakage, and uneven glue.

[0057] In step S1, the detection conformal convex die 2 of the reinforcing edge 1 is designed, considering the blade shape size tolerance and the glue thickness requirement, and the detection conformal convex die 2 for detecting the inner profile of the reinforcing edge 1 is designed. The detection conformal convex die 2 is used as a detection standard tool, and its manufacturing precision and tolerance meet the requirements of the tool grade. At the same time, the assembly tolerance requirement of the reinforcing edge 1 and the conformal die is established, which can be detected by the corresponding plug gauge.

[0058] In step S2, the size of the opening angle on the reinforcing edge 1 is measured. The prepared metal reinforcing edge 1 is placed on the detection conformal convex die 2 for assembly, and the plug gauge is used to evaluate the assembly gap on both sides of the pressure surface wall plate 7 and the suction surface wall plate 6. When there is a larger gap in a local position, that is, the largest plug gauge can enter, it indicates that the opening angle of this position is larger. When there is a smaller gap in a local position, that is, the smallest plug gauge cannot enter, and the reinforcing edge 1 is difficult to install with the local conformal convex die, indicating that the opening angle of this position is smaller. The size of the opening angle on the reinforcing edge 1 is determined by using plug gauges of different sizes, which is simple and direct.

[0059] As shown in Figure 1 and Figure 3 In step S3, according to the design tolerance requirement of the profile of the reinforcing edge 1, and combining the theory of rectification, the size of the rectification conformal convex die 3 is determined by using the method of finite element simulation or empirical formula. The rectification conformal convex die 3 includes a first rectification conformal convex die 31 and a second rectification conformal convex die 32. The first rectification conformal convex die 31 is based on the inner tolerance band of the profile tolerance band of the reinforcing edge 1, and is used for rectification when the opening angle of the reinforcing edge 1 is larger. The second rectification conformal convex die 32 is based on the outer tolerance band of the profile tolerance band of the reinforcing edge 1, and is used for rectification when the opening angle of the reinforcing edge 1 is smaller.

[0060] AsFigure 1 and Figure 4 As shown, in step S4, based on the detection results in step S2, for the parts requiring correction, the corresponding first and second corrective conformal punches 31 and 32 are replaced. Both the first and second corrective conformal punches 31 and 32 are mounted on the base 10 during correction. In step S4, local microplastic roll forming technology is used to correct the reinforcing edge 1 along the outer surface of the wall panel. Using local microplastic roll forming technology can create compressive stress on the outer surface of the reinforcing edge 1 and refine the surface grains and structure, which helps prevent the initiation of fatigue cracks. During the roll forming process, one side of the wall panel is first supported, and then roll forming is gradually performed from the leading edge to the end of the wall panel. The suction surface wall panel 6 is roll-formed using a suction surface roll head 8. Depending on the degree of deviation, multiple passes of gradual roll forming can be designed to reduce plastic deformation caused by roll forming. After one side of the wall panel is rolled, that side is supported, and the other side of the wall panel is rolled. This rolling method can reduce the plastic deformation of the reinforcing edge 1 and enhance the straightening effect.

[0061] like Figure 1 and Figure 5 As shown, in step S4, the first conformal punch 31 and the second conformal punch 32 are provided with ejector holes 4. The ejector holes 4 facilitate demolding. In other embodiments, either the first conformal punch 31 or the second conformal punch 32 is provided with ejector holes 4, reducing the machining of the ejector holes 4.

[0062] In step S1, the conformal punch 2 for testing is designed in segments according to the curved surface shape of the reinforcing edge 1. This segmented design reduces manufacturing and assembly difficulty, facilitating subsequent replacement and repair of the conformal punch. In step S2, the size of the angle on the reinforcing edge 1 corresponding to each segment of the conformal punch 2 is measured. The angles on the reinforcing edge 1 corresponding to each segment are measured to facilitate subsequent operations. In step S4, based on the size of the angles corresponding to each segment, either the first corrective conformal punch 31 or the second corrective conformal punch 32 corresponding to each segment is selected for corrective shaping. This method further improves the accuracy of the corrective shaping of the reinforcing edge 1 and enhances the corrective effect.

[0063] Step S12 is also included between steps S1 and S2:

[0064] The internal tolerance of reinforcing edge 1 is checked. If the internal tolerance meets the set requirements, step S2 is skipped. Before straightening, reinforcing edge 1 is checked using conformal punch 2. If reinforcing edge 1 meets the design requirements, straightening is not required, reducing processes and saving costs.

[0065] Following step S4, step S41 is also included:

[0066] The inner profile tolerance of the reinforcing edge 1 is detected.

[0067] After the orthopedic is completed, the reinforcing edge 1 is detected again, and the orthopedic effect can be tested to avoid that the defective product is put into use.

[0068] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A method of detecting and correcting a stiffener edge for stiffening a fan blade of an aeroengine, characterized in that, The detection and correction method of the reinforcing edge comprises: S1, designing a conforming punch for detecting the reinforcing edge; the reinforcing edge has a pressure surface wall plate and a suction surface wall plate; S2, measuring the size of the opening angle on the reinforcing edge; using a feeler gauge to evaluate the assembly gap between the conforming punch and the pressure surface wall plate and between the conforming punch and the suction surface wall plate, and determining that the part with a larger assembly gap has a larger opening angle and the part with a smaller assembly gap has a smaller opening angle; S3, designing a first correction conforming punch for the reinforcing edge according to the inner tolerance band of the airfoil tolerance band of the reinforcing edge, and designing a second correction conforming punch for the reinforcing edge according to the outer tolerance band of the airfoil tolerance band of the reinforcing edge; S4, selecting the first correction conforming punch or the second correction conforming punch for correction according to the size of the opening angle; selecting the first correction conforming punch for correction at the part with a larger opening angle, and selecting the second correction conforming punch for correction at the part with a smaller opening angle.

2. The method of claim 1, wherein the reinforcing edge is detected and corrected by: In step S1, the conforming punch for detection is designed in sections according to the curved surface shape of the reinforcing edge.

3. The method of claim 2, wherein the step of detecting the reinforcing edge comprises the step of: In step S2, the size of the opening angle on the reinforcing edge corresponding to each section of the conforming punch for detection is measured. ​ 4. The method of claim 3, wherein the step of detecting the reinforcing bead comprises the step of: In step S4, the first correction conforming punch or the second correction conforming punch corresponding to each section is selected for correction according to the size of the opening angle corresponding to each section. ​ 5. The method of claim 1, wherein the reinforcing edge is detected and corrected by: In step S4, the reinforcing edge is corrected by using a local micro-roller forming technology.

6. The method of claim 1, wherein the reinforcing edge is detected and corrected by: In step S4, the first correction conforming punch and / or the second correction conforming punch is provided with an ejection hole inside.

7. The method of claim 1, wherein the reinforcing edge is detected and corrected by: In step S4, the first correction conforming punch or the second correction conforming punch is gradually rolled with the reinforcing edge, and after the reinforcing edge is completely attached to the first correction conforming punch or the second correction conforming punch, the reinforcing edge is demolded from the first correction conforming punch or the second correction conforming punch.

8. The method of claim 1, wherein the reinforcing edge is detected and corrected by: Between steps S1 and S2, step S12 is further included: The inner profile tolerance of the reinforcing edge is detected, and if the inner profile tolerance meets the set requirements, step S2 is not performed.

9. The method of claim 1, wherein the reinforcing edge is detected and corrected by: After step S4, step S41 is further included: The inner profile tolerance of the reinforcing edge is detected.

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