Method of disassembly of a threaded fastener of a deformation test piece

Abstract

The application provides a disassembly method of a threaded fastener of a deformation test piece, which comprises the following steps: S1, increasing the tightening torque of the threaded fastener on both sides of a bolt to be disassembled, so that the installation edge of a super-turbine disk is attached to the installation edge of an adapter disk; S2, turning the extrusion surface of the bolt to be disassembled out of the disk cavity of a turbine disk through the first end of an arc-shaped adapter section; S3, using a press to press the second end of the arc-shaped adapter section, and extruding the end surface of the bolt to be disassembled to the vicinity of the installation edge of the super-turbine disk; S4, turning the arc-shaped adapter section by 180 degrees, turning the head end surface of the bolt to be disassembled out of the turbine disk cavity through the second end of the arc-shaped adapter section, and again using the press to press the second end of the arc-shaped adapter section to disassemble the bolt to be disassembled from the installation hole. The application can realize non-destructive disassembly of a large deformed part, and is convenient for accurately judging the test result.

Description

Technical Field

[0001] This invention relates to the field of engine assembly, and in particular to a method for disassembling threaded fasteners in deformation test specimens. Background Technology

[0002] Under the existing airworthiness requirements, the turbine rotor (turbine disk) of an aircraft engine needs to undergo an overspeed test. The turbine rotor component is equipped with blades or blade counterweights on a test bench and is subjected to an overspeed test at 120% of its maximum permissible speed for 5 minutes. After the test, the tested parts are required to be free of cracks.

[0003] Under normal circumstances, the turbine disk will undergo significant deformation after over-rotation testing. Figure 1 This is a schematic diagram of a turbine disk overrun test specimen. Figure 1 As shown, the turbine disk over-rotation test piece consists of an over-rotation disk 10, a sealing ring 20, a transfer disk 30, and a transfer shaft 40. The over-rotation disk 10 and the transfer disk 30 are fastened together by multiple evenly distributed bolts and nuts 50. The bolts are located inside the turbine disk cavity, less than 30mm away from the disk spokes of the transfer disk. The space is small, making it difficult to apply external force to overcome deformation and achieve disassembly.

[0004] Figure 2 This is a schematic diagram of the deformation of the turbine disk over-rotation test specimen. Figure 2 As shown, the turbine rotor (turbine disk) of an aero-engine needs to undergo an overspeed test. On the test bench, the turbine rotor component is equipped with blades or blade counterweights 60. After the test, the overspeed disk 10 underwent significant deformation, the deformation result of which is shown below. Figure 2 As shown, the residual deformation of the super turntable 10 is within the range of 2%-3%. The super turntable 10 undergoes outward torsional deformation, causing the front mounting edge of the super turntable 10 to no longer fit with the connecting surfaces of the sealing ring 20 and the adapter plate 30, resulting in gaps. The connecting bolts between the super turntable 10 and the adapter plate 30 are tilted. Due to the large torsional deformation of the super turntable, the connecting bolts are subjected to large shear forces and cannot be properly disassembled.

[0005] For test specimens that have undergone significant deformation, destructive disassembly is typically employed. This involves cutting all connecting bolts using a machine tool or by hand before disassembling the specimen. However, destructive disassembly can easily damage parts, affecting the interpretation of test results.

[0006] In view of this, the inventors of this application have designed a method for disassembling threaded fasteners in deformable test specimens in order to overcome the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem solved by the present application is to overcome the defects in the prior art that the super-rotating disc is greatly distorted, the connecting bolt is subjected to a large shear force, cannot be normally disassembled, and the disassembly is easy to cause damage to the parts and affect the judgment of test results, and to provide a disassembly method of a threaded fastener of a deformation test piece.

[0008] The present application solves the above technical problems by the following technical solutions:

[0009] A disassembly method of a threaded fastener of a deformation test piece, characterized in that the disassembly method comprises the following steps:

[0010] S1, increasing the tightening torque of the threaded fastener on both sides of the bolt to be disassembled, so that the mounting edge of the super-rotating disc and the mounting edge of the adapter disc are attached;

[0011] S2, turning the extrusion surface of the bolt to be disassembled out of the disc cavity of the turbine disc through the first end portion of the arc-shaped adapter segment;

[0012] S3, using a press to press-fit the second end portion of the arc-shaped adapter segment, and pressing the end surface of the bolt to be disassembled to the vicinity of the mounting edge of the super-rotating disc;

[0013] S4, turning the arc-shaped adapter segment by 180 degrees, turning the head end surface of the bolt to be disassembled out of the turbine disc cavity through the second end portion of the arc-shaped adapter segment, and again using a press to press-fit the second end portion of the arc-shaped adapter segment to disassemble the bolt to be disassembled from the mounting hole.

[0014] According to one embodiment of the present application, the step S1 further comprises:

[0015] determining whether the mounting edge of the super-rotating disc and the mounting edge of the adapter disc are attached, and if attached, entering step S2;

[0016] If they cannot be attached, clamping members are arranged on both sides of the bolt to be disassembled in the pre-clamping area, the deformation area is further inhibited, the connecting edge of the test piece is attached, and the bolt to be disassembled is righted.

[0017] According to one embodiment of the present application, the tightening torque of the threaded fastener in the step S1 is less than or equal to 2.5 times the predetermined torque.

[0018] According to one embodiment of the present application, the step S4 comprises that the second end portion of the arc-shaped adapter segment is provided with at least one avoiding slot, and the avoiding slot passes through the screw rod portion of the bolt to be disassembled.

[0019] According to one embodiment of the present application, the step S4 further comprises:

[0020] S5, through the step S1 to the step S4 after half of the bolt to be divided, and then through the installation hole diameter smaller bolt to fill the two sides of the bolt to be divided, by increasing the bolt clamping force way to suppress the deformation of the two sides of the bolt to be divided, so that the super rotation disc installation edge and adapter disc installation edge fit.

[0021] According to one embodiment of the application, the judgment of the super rotation disc installation edge and the adapter disc installation edge is fitted, if it is fitted, the next step is entered;

[0022] If it cannot be fitted, the clamping member is arranged in the pre-clamping area on the two sides of the bolt to be divided, and the deformation area is further suppressed, so that the test piece connecting edge is fitted, and the bolt to be divided is righted.

[0023] According to one embodiment of the application, the clamping member includes a clamp or a threaded clamp plate.

[0024] According to one embodiment of the application, the step S5 further comprises:

[0025] S6, the steps S1 to S5 are repeated, and the remaining half of the bolt is divided.

[0026] According to one embodiment of the application, the step S5 further comprises:

[0027] S7, the adapter disc, the sealing ring and the super rotation disc are removed in turn, and the test piece is disassembled.

[0028] The positive progress effect of the application is that:

[0029] The disassembly method of the threaded fastener of the deformation test piece can realize the non-destructive disassembly of the large deformation part, and facilitate the accurate judgment of the test result.

[0030] The disassembly method of the threaded fastener of the deformation test piece, by increasing the clamping torque of the threaded fastener, and by increasing the clamping tool on the two sides of the bolt to be disassembled, the deformation area is suppressed, so that the local installation edge of the super rotation disc and the adapter disc installation edge are fitted, the bolt on the position is righted after fitting, the disassembly resistance is greatly reduced, the bolt end face can be transferred from the turbine disc cavity through the arc adapter segment, and the bolt is pressed out by the press or hammering method. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other features, properties and advantages of the application will become more apparent from the following description of the application taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals are used to represent the same features throughout the drawings, wherein:

[0032] Figure 1 The schematic view of the turbine disc super rotation test piece.

[0033] Figure 2A schematic diagram of deformation of a test piece for a turbine disk.

[0034] Figure 3 A schematic diagram of deformation suppression of a disassembly method of a threaded fastener of a test piece according to the present invention Figure 1 .

[0035] Figure 4 A schematic diagram of deformation suppression of a disassembly method of a threaded fastener of a test piece according to the present invention Figure 2 .

[0036] Figure 5 A schematic diagram of a test piece disassembly in a disassembly method of a threaded fastener of a test piece according to the present invention

[0037] Figure 6 A longitudinal sectional view of Figure 5 .

[0038] Figure 7 A schematic diagram of a structure of an arcuate rotation stage in a disassembly method of a threaded fastener of a test piece according to the present invention DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present invention more clear and comprehensible, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0040] Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0041] Further, although the terms used in the present invention are selected from publicly-known and used terms, some of the terms mentioned in the specification of the present invention can be selected by the applicant at his or her discretion, and their detailed meanings are described in relevant parts of the description herein.

[0042] Further, the present invention is to be understood not only in the sense of the actual preferred embodiments described in the present specification but also in the sense provided by the terms used therein; each of which is to be interpreted not in an absolutely generic sense but in a sense intended by the applicant to define the present invention best in light of the prior art at the time the present invention was made.

[0043] As Figures 3 to 7 shown, the present invention discloses a disassembly method of a threaded fastener of a test piece, which comprises the following steps:

[0044] Step S1, increase the threaded fastener tightening torque on both sides of the bolt to be disassembled, so that the super-rotation disk mounting edge and the adapter disk mounting edge are fitted.

[0045] The threaded fastener tightening torque in the step S1 is less than or equal to 2.5 times the predetermined torque, and the bolt exceeding 2.5 times will be broken.

[0046] Preferably, step S1 further includes:

[0047] Determine whether the mounting edge of the super turntable and the mounting edge of the adapter plate are in contact. If they are in contact, proceed to step S2.

[0048] If they cannot fit together, clamping elements are set in the pre-clamping areas 100 on both sides of the bolt to be separated 200 to further suppress the deformation area, so that the connecting edges of the test piece fit together, and the bolt to be separated is straightened or nearly straightened.

[0049] The clamping element may preferably include clamps or threaded clamps. For example... Figure 3 As shown, the clamping position 110 and the separation position 120 are located on both sides of the pre-clamping area 100.

[0050] Step S1 involves increasing the tightening torque of the threaded fasteners on both sides of the bolt to be separated 200 (not exceeding 2.5 times the predetermined torque; exceeding 2.5 times will cause the bolt to break), thereby locally suppressing the deformation of the super turntable and ensuring that the mounting edge of the super turntable roughly fits against the mounting edge of the adapter plate. If they cannot fit, clamps or threaded clamps are placed in the pre-clamping areas on both sides of the bolt to be separated to further suppress the deformation area, ensuring that the connecting edges of the test piece fit together and the bolt to be separated is straightened or nearly straightened.

[0051] Step S2: The pressing surface of the bolt 200 to be separated is rotated out of the turbine disk cavity through the first end 310 of the bow-shaped adapter section 300. This allows for an open space for applying force, facilitating operation.

[0052] Step S3: Use a press 400 to press the second end 320 of the bow-shaped transition section 300 (or hammer it) to press the end face of the bolt to be separated 200 to the vicinity of the mounting edge of the super turntable.

[0053] Step S4: Rotate the bow-shaped adapter section 300 by 180 degrees, and use the second end 320 of the bow-shaped adapter section 300 to transfer the head end face of the bolt to be separated from the turbine disk through the second end 320. Then, use a press to press the second end of the bow-shaped adapter section to separate the bolt from the mounting hole.

[0054] Preferably, step S4 includes: the second end 320 of the bow-shaped transition section 300 is provided with at least one clearance groove 321, the clearance groove 321 is passed through the screw portion of the bolt to be separated 200, so that the second end 320 of the bow-shaped transition section 300 transfers the end face of the bolt head out of the turbine disk cavity, and the second end 320 of the bow-shaped transition plate 300 is pressed again by the press 400 (or hammered) to separate the bolt to be separated from the mounting hole.

[0055] Furthermore, after step S4, the method further includes:

[0056] Step S5, through the half of the bolt to be divided after the step S1 to the step S4, and then through the bolt 210 smaller than the installation hole diameter to fill the two sides of the bolt to be divided 200 (as shown in Figure 4 The bolt deformation on both sides of the bolt to be divided is inhibited by increasing the bolt clamping force, so that the deformation of the overspeed disk is locally inhibited, and the overspeed disk mounting edge is substantially fitted with the adapter disk mounting edge.

[0057] Preferably, it is judged whether the overspeed disk mounting edge and the adapter disk mounting edge are fitted, and if so, the next step is entered;

[0058] If it cannot be fitted, a clamping member is arranged on both sides of the pre-clamping area of the bolt to be divided, and the deformation area is further inhibited, so that the test piece connecting edge is fitted, and the bolt to be divided is straightened or approximately straightened.

[0059] The clamping member includes a clamp or a threaded clamp plate. As shown in Figure 4 The two sides of the pre-clamping area 100 are clamping positions 110 (arranged with bolts 210 smaller than the installation hole diameter) and bolt to be divided positions 120.

[0060] In addition, the step S5 further includes:

[0061] Step S6, repeat the steps S1 to S5 to complete the remaining half of the bolt disassembly.

[0062] Further, the step S5 can further include:

[0063] Step S7, sequentially remove the adapter disk, the sealing ring and the overspeed disk, and complete the test piece disassembly.

[0064] According to the above method description, the disassembly method of the deformation test piece threaded fastener of the application has the following innovative points:

[0065] I. A non-destructive disassembly process is proposed for the deformed overspeed test piece, which is convenient for accurate judgment of test results.

[0066] II. By increasing the clamping torque of the threaded fastener, and by increasing the clamping tool (such as a clamp or a threaded clamp plate) on both sides of the bolt to be disassembled, the deformation area is inhibited, so that the local mounting edge of the overspeed disk is fitted with the adapter disk mounting edge, and after fitting, the bolt at this position is straightened, reducing the bolt disassembly resistance (reducing the shear force);

[0067] III. The bolt end face (or bolt head end face) is transferred out of the turbine disk cavity through the arc-shaped adapter segment, and the bolt is pressed out (knocked out) by a press or hammering, effectively overcoming the limitation condition that the bolt is located inside the turbine disk cavity, the operation space is small, and it is difficult to apply external force to overcome the deformation to realize disassembly;

[0068] Four, the second end of the arc-shaped adapter segment is provided with an avoiding groove, which can be in contact with the end face of the bolt head through the screw rod, and when the bolt is disassembled to the connecting surface of the overspeed disk and has not been separated from the mounting hole, the bolt can be separated from the mounting hole by applying a disassembling force through the bolt head.

[0069] In summary, the disassembling method of the deformed test piece threaded fastener can realize non-destructive disassembly of a large deformed part, and facilitates accurate judgment of test results.

[0070] The disassembling method of the deformed test piece threaded fastener, by increasing the clamping torque of the threaded fastener, and by increasing clamping tools (such as clamps or threaded clamps) on both sides of the bolt to be disassembled to suppress the deformation area, the local mounting edge of the overspeed disk is in contact with the adapter disk mounting edge, and after the contact, the bolt at this position is righted (or approximately righted), the disassembly resistance is greatly reduced, the bolt end face (or bolt head end face) can be transferred from the turbine disk cavity through the arc-shaped adapter segment, and the bolt is pressed out (knocked out) by using a press or hammering.

[0071] For those skilled in the art, the above disclosure of the application is only an example and does not limit the application. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the application. Such modifications, improvements and corrections are suggested in the application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the application.

[0072] Meanwhile, specific words are used in the application to describe the embodiments of the application. As "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0073] Similarly, it should be noted that, in order to simplify the description of the disclosure of the application and to help understand one or more embodiments of the application, sometimes multiple features are combined into one embodiment, figure or description thereof in the foregoing description of the embodiments of the application. However, this disclosure method does not mean that the features required by the application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the disclosed single embodiment.

[0074] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that these are merely illustrative, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and the essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A method for disassembling a deformable test piece threaded fastener, characterized in that, The decomposition method includes the following steps: S1. Increase the tightening torque of the threaded fasteners on both sides of the bolt to be separated, so that the mounting edge of the super turntable fits into the mounting edge of the adapter plate. S2. The pressing surface of the bolt to be separated is rotated out of the turbine disk cavity through the first end of the bow-shaped transition section; S3. Use a press to press the second end of the bow-shaped transition section, pressing the end face of the bolt to be separated to the vicinity of the mounting edge of the super turntable; S4. Flip the bow-shaped adapter section 180 degrees, and use the second end of the bow-shaped adapter section to transfer the head end face of the bolt to be separated from the disk cavity of the turbine disk. Then, use a press to press the second end of the bow-shaped adapter section to separate the bolt from the mounting hole. Step S1 further includes: determining whether the mounting edge of the super turntable and the mounting edge of the adapter plate are in contact; if they are in contact, proceed to step S2. If they cannot fit together, clamping parts are set in the pre-clamping areas on both sides of the bolt to be separated to further suppress the deformation area, so that the connecting edges of the test piece fit together and the bolt to be separated is straightened.

2. The method for disassembling threaded fasteners in deformable test specimens as described in claim 1, characterized in that, In step S1, the tightening torque of the threaded fastener is less than or equal to 2.5 times the predetermined torque.

3. The method for disassembling threaded fasteners in deformation test specimens as described in claim 1, characterized in that, Step S4 includes: at least one clearance groove is provided at the second end of the bow-shaped transition section, and the clearance groove passes through the threaded portion of the bolt to be separated.

4. The method for disassembling the threaded fastener of the deformation test piece as described in claim 1, characterized in that, The process following step S4 also includes: S5. After steps S1 to S4, remove half of the bolts to be separated, and then fill the gaps on both sides of the bolts to be separated with bolts smaller than the diameter of the mounting holes. By increasing the clamping force of the bolts, the deformation on both sides of the bolts to be separated is suppressed, so that the mounting edge of the super turntable fits with the mounting edge of the adapter plate.

5. The method for disassembling threaded fasteners in deformable test specimens as described in claim 4, characterized in that, Determine if the mounting edge of the super turntable and the mounting edge of the adapter plate are in contact. If they are in contact, proceed to the next step. If they cannot fit together, clamping parts are set in the pre-clamping areas on both sides of the bolt to be separated to further suppress the deformation area, so that the connecting edges of the test piece fit together and the bolt to be separated is straightened.

6. The method for disassembling the threaded fastener of the deformation test piece as described in claim 1 or 5, characterized in that, The clamping element includes clamps or threaded clamps.

7. The method for disassembling threaded fasteners in deformable test specimens as described in claim 4, characterized in that, Following step S5, the following is also included: S6. Repeat steps S1 to S5 to complete the disassembly of the remaining half of the bolts.

8. The method for disassembling threaded fasteners in deformable test specimens as described in claim 7, characterized in that, Following step S6, the following is also included: S7. Remove the adapter plate, sealing ring, and super turntable in sequence to complete the disassembly of the test piece.

Images