Decomposition method of threaded fastener of deformation test piece

Abstract

The invention provides a method for disassembling a threaded fastener of a deformation test piece, which comprises the following steps of: S1, increasing the tightening torque of the threaded fastener on the two sides of a bolt to be disassembled, so that the mounting edge of a super-rotating disc is attached to the mounting edge of a transfer disc; s2, the extrusion face of the to-be-divided bolt is rotated out of a disc cavity of the turbine disc through the first end of the arch-shaped switching section; s3, a press machine is adopted for press fitting of the second end of the arch-shaped switching section, and the end face of the to-be-divided bolt is pressed to the position close to the mounting edge of the super rotating disc; and S4, the arch-shaped switching section is turned over by 180 degrees, the end face of the head of the to-be-disassembled bolt is switched out of the turbine disc through the second end of the arch-shaped switching section, and the second end of the arch-shaped switching section is pressed again through the press machine to separate the to-be-disassembled bolt out of the mounting hole. According to the invention, non-destructive decomposition of a large-deformation part can be realized, and accurate judgment on a test result is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of engine assembly, and particularly relates to a method for disassembling threaded fasteners of a deformed test piece. Background Art

[0002] In existing airworthiness requirements, an aeroengine turbine rotor (turbine disk) needs to undergo a super-rotation test. On the test bench, the turbine rotor component is equipped with blades or blade counterweights, and the super-rotation test is carried out at 120% of its maximum allowable speed, with a 5-minute load holding. After the test, it is required to check that the parts have no cracks.

[0003] Generally in the test, after the turbine disk undergoes the super-rotation test, it will undergo large deformation. Figure 1 FIG. is a schematic diagram of a turbine disk super-rotation test piece. As Figure 1 shown, the turbine disk super-rotation test piece is composed of a super-rotation disk 10, a seal ring 20, an adapter disk 30, and an adapter shaft 40. The super-rotation disk 10 and the adapter disk 30 are fixedly connected by a plurality of evenly distributed bolt nuts 50. The bolts are located inside the turbine disk cavity, less than 30 mm away from the disk web of the adapter disk, and the space is narrow, making it difficult to apply an external force to overcome the deformation for disassembly.

[0004] Figure 2 FIG. is a schematic diagram of the deformation of the turbine disk super-rotation test piece. As Figure 2 shown, an aeroengine turbine rotor (turbine disk) needs to undergo a super-rotation test. On the test bench, the turbine rotor component is equipped with blades or blade counterweights 60. After the test, the super-rotation disk 10 has undergone large deformation, and its deformation result is as Figure 2 shown. The residual deformation of the super-rotation disk 10 is in the range of 2% - 3%. The super-rotation disk 10 is twisted and deformed outward, resulting in a non-fitting connection surface between the front mounting edge of the super-rotation disk 10 and the seal ring 20 and the adapter disk 30, with a gap existing. The connecting bolts between the super-rotation disk 10 and the adapter disk 30 are inclined. Due to the large torsional deformation of the super-rotation disk, the connecting bolts are subjected to a large shear force and cannot be disassembled normally.

[0005] For the disassembly of test pieces with large deformation, destructive disassembly is usually adopted. For example, after sawing off all the connecting bolts by a machine tool or manually, the test piece is disassembled. Destructive disassembly is likely to cause damage to the parts and affect the judgment of the test results.

[0006] In view of this, the inventor of the present application has designed a method for disassembling threaded fasteners of a deformed test piece in order to overcome the above technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the super turntable undergoes large torsional deformation, the connecting bolts are subjected to large shear forces and cannot be decomposed normally, and the damage and decomposition are likely to cause damage to parts and affect the judgment of test results, and to provide a method for decomposing the threaded fasteners of a deformed test piece.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A method for decomposing the threaded fasteners of a deformed test piece, characterized in that the decomposition method includes the following steps:

[0010] S 1 Increase the tightening torque of the threaded fasteners on both sides of the bolt to be disassembled, so that the mounting edge of the super turntable is in contact with the mounting edge of the adapter plate;

[0011] S 2 Rotate the pressing surface of the bolt to be disassembled out of the cavity of the turbine disk through the first end of the bow-shaped adapter section;

[0012] S 3 Use a press to press the second end of the bow-shaped adapter section to press the end face of the bolt to be disassembled near the mounting edge of the super turntable;

[0013] S 4 Flip the bow-shaped adapter section by 180 degrees, transfer the head end face of the bolt to be disassembled out of the turbine disk cavity through the second end of the bow-shaped adapter section, and use a press to press the second end of the bow-shaped adapter section again to separate the bolt to be disassembled from the mounting hole.

[0014] According to an embodiment of the present invention, the step S 1 further includes:

[0015] Judge whether the mounting edge of the super turntable is in contact with the mounting edge of the adapter plate. If they are in contact, enter step S 2 ;

[0016] If they cannot be in contact, set clamping parts in the pre-clamping areas on both sides of the bolt to be disassembled, further suppress the deformation area to make the connection edge of the test piece in contact, and straighten the bolt to be disassembled.

[0017] According to an embodiment of the present invention, the tightening torque of the threaded fasteners in the step S 1 is less than or equal to 2.5 times the predetermined torque.

[0018] According to an embodiment of the present invention, the step S 4 includes: at least one avoidance groove is opened at the second end of the bow-shaped adapter section, and the avoidance groove passes through the screw part of the bolt to be disassembled.

[0019] According to an embodiment of the present invention, after the step S 4 further includes:

[0020] S 5 and, after the step S 1 to the step S 4 half of the bolts to be divided are removed, and then bolts smaller than the diameter of the mounting holes are used to fill the vacant positions on both sides of the bolts to be divided. By increasing the clamping force of the bolts, the deformation on both sides of the bolts to be divided is suppressed, so that the mounting edge of the super turntable is fitted with the mounting edge of the adapter plate.

[0021] According to an embodiment of the present invention, it is judged whether the mounting edge of the super turntable is fitted with the mounting edge of the adapter plate. If they are fitted, proceed to the next step;

[0022] If they cannot be fitted, clamping members are provided in the pre-clamping areas on both sides of the bolts to be divided to further suppress the deformation area, so that the connecting edges of the test pieces are fitted and the bolts to be divided are straightened.

[0023] According to an embodiment of the present invention, the clamping member includes a clamp or a threaded splint.

[0024] According to an embodiment of the present invention, after the step S 5 further includes:

[0025] S 6 and repeating the step S 1 to the step S 5 to complete the decomposition of the remaining half of the bolts.

[0026] According to an embodiment of the present invention, after the step S 5 further includes:

[0027] S 7 and sequentially removing the adapter plate, the seal ring, and the super turntable to complete the decomposition of the test piece.

[0028] The positive and progressive effects of the present invention are as follows:

[0029] The decomposition method of the threaded fasteners of the deformed test piece of the present invention can achieve the non-destructive decomposition of relatively large deformed parts, which is convenient for accurately judging the test results.

[0030] For the decomposition method of the threaded fasteners of the deformed test piece, by increasing the clamping torque of the threaded fasteners and by adding clamping tools on both sides of the bolts to be decomposed to suppress the deformation area, the local mounting edge of the super turntable is fitted with the mounting edge of the adapter plate. After fitting, the bolts at this position are straightened, and the decomposition resistance is greatly reduced. The bolt end face can be transferred out of the turbine disk cavity through the bow-shaped transfer section, and the bolts are pressed out by using a press or hammering. Description of the Drawings

[0031] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0032] Figure 1 Schematic diagram of the turbine disk over-rotation test piece.

[0033] Figure 2 Schematic diagram of the deformation of the turbine disk over-rotation test piece.

[0034] Figure 3 Schematic diagram of the deformation suppression of the threaded fastener decomposition method of the deformation test piece of the present invention Figure 1 .

[0035] Figure 4 Schematic diagram of the deformation suppression of the threaded fastener decomposition method of the deformation test piece of the present invention Figure 2 .

[0036] Figure 5 This is a schematic diagram of the decomposition of a deformed test piece in the method for decomposing a threaded fastener of the present invention.

[0037] Figure 6 for Figure 5 Longitudinal section view of .

[0038] Figure 7 It is a structural schematic diagram of the bow-shaped rotation stage in the method for disassembling a threaded fastener of a deformation test piece of the present invention. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0041] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0042] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

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

[0044] Step S 1 , 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 with the mounting edge of the adapter plate.

[0045] The said Step S 1 The tightening torque of the threaded fasteners is less than or equal to 2.5 times the predetermined torque. If it exceeds 2.5 times, the bolt will break.

[0046] Preferably, the said Step S 1 also includes:

[0047] Judge whether the mounting edge of the super turntable fits with the mounting edge of the adapter plate. If it fits, enter Step S 2 ;

[0048] If it cannot fit, set clamping parts 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 edge of the test piece fits, and the bolt to be separated is straightened or approximately straightened.

[0049] The clamping parts may preferably include clamp pliers or threaded splints. As Figure 3 shown, on both sides of the pre-clamping area 100 are the clamping positions 110 and the separating position 120.

[0050] Step S 1 By 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. If it exceeds 2.5 times, the bolt will break), the deformation of the super turntable can be locally suppressed, and the mounting edge of the super turntable fits approximately with the mounting edge of the adapter plate. If it cannot fit, by setting clamp pliers or threaded splints in the pre-clamping areas on both sides of the bolt to be separated, the deformation area is further suppressed, so that the connecting edge of the test piece fits, and the bolt to be separated is straightened or approximately straightened.

[0051] Step S 2 , turn out the pressing surface of the bolt to be separated 200 from the cavity of the turbine disk through the first end 310 of the bow-shaped adapter section 300. This can make the force application space open and convenient for operation.

[0052] Step S 3 , use a press 400 to press-fit the second end 320 of the bow-shaped adapter section 300 (or hammer it), and press the end face of the bolt to be separated 200 near the mounting edge of the super turntable.

[0053] Step S 4 , turn the bow-shaped adapter section 300 by 180 degrees, turn out the head end face of the bolt to be disassembled from the cavity of the turbine disk through the second end 320 of the bow-shaped adapter section 300, and again use a press to press-fit the second end of the bow-shaped adapter section to separate the bolt to be separated from the mounting hole.

[0054] Preferably, the step S 4 includes: at least one avoidance groove 321 is formed at the second end 320 of the arcuate adapter section 300, the avoidance groove 321 is passed through the screw rod portion of the bolt 200 to be separated, so that the second end 320 of the arcuate adapter section 300 transfers the end face of the bolt head out of the turbine disk cavity, and then the second end 320 of the arcuate adapter plate 300 is press-fitted (or hammered) by a press 400 to separate the bolt 200 to be separated from the mounting hole.

[0055] Furthermore, after the step S 4 also includes:

[0056] Step S 5 , through the step S 1 to the step S 4 after that, half of the bolts to be separated are removed, and then bolts 210 with a diameter smaller than the mounting hole are used to fill the empty spaces on both sides of the bolt 200 to be separated (as Figure 4 shown), and the deformation on both sides of the bolt to be separated is suppressed by increasing the bolt clamping force, so that the deformation of the super turntable is locally suppressed, and the mounting edge of the super turntable is approximately fitted with the mounting edge of the adapter plate.

[0057] Preferably, it is judged whether the mounting edge of the super turntable is fitted with the mounting edge of the adapter plate. If it is fitted, proceed to the next step;

[0058] If they cannot be fitted, clamping members are arranged 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 are fitted, and the bolt to be separated is straightened or approximately straightened.

[0059] The clamping members described here include clamp pliers or threaded splints. As Figure 4 shown, on both sides of the pre-clamping area 100 are clamping positions 110 (bolts 210 with a diameter smaller than the mounting hole are arranged) and the separation position 120.

[0060] In addition, after the step S 5 also includes:

[0061] Step S 6 , repeat the step S 1 to the step S 5 to complete the decomposition of the remaining half of the bolts.

[0062] Further, after the step S 5 may also include:

[0063] Step S 7 , sequentially remove the adapter plate, the seal ring, and the super turntable to complete the decomposition of the test piece.

[0064] According to the above method description, the disassembly method of the threaded fasteners of the deformed test piece of the present invention has the following innovative points:

[0065] 1. A non-destructive disassembly process is proposed for the over-rotated test piece after deformation, which is convenient for accurately judging the test results.

[0066] 2. By increasing the clamping torque of the threaded fasteners and by adding clamping tools (such as clamps or threaded splints) on both sides of the bolt to be disassembled to suppress the deformed area, the local mounting edge of the over-rotating disk is made to fit with the mounting edge of the adapter disk. After fitting, the bolt at this position is straightened (or approximately straightened), and the disassembly resistance is greatly reduced (the shear force is reduced);

[0067] 3. The end face of the bolt (or the end face of the bolt head) is transferred out of the turbine disk cavity through the bow-shaped transfer section, and the bolt is pressed out (knocked out) by using a press or hammering, effectively overcoming the limitation that the bolt is located inside the turbine disk cavity, the operation space is narrow, and it is difficult to apply external force to overcome the deformation to achieve disassembly;

[0068] 4. The second end of the bow-shaped transfer section is provided with an avoidance groove, which can pass through the screw rod and fit with the end face of the bolt head. When the bolt is disassembled until the connection surface of the over-rotating disk has not yet come out of the mounting hole, the disassembly force can be applied through the bolt head to separate it from the mounting hole.

[0069] In summary, the disassembly method of the threaded fasteners of the deformed test piece of the present invention can achieve non-destructive disassembly of large deformed parts, which is convenient for accurately judging the test results.

[0070] For the disassembly method of the threaded fasteners of the deformed test piece, by increasing the clamping torque of the threaded fasteners and by adding clamping tools (such as clamps or threaded splints) on both sides of the bolt to be disassembled to suppress the deformed area, the local mounting edge of the over-rotating disk is made to fit with the mounting edge of the adapter disk. After fitting, the bolt at this position is straightened (or approximately straightened), the disassembly resistance is greatly reduced, and the end face of the bolt (or the end face of the bolt head) can be transferred out of the turbine disk cavity through the bow-shaped transfer section, and the bolt is pressed out (knocked out) by using a press or hammering.

[0071] For those skilled in the art, the above invention disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0072] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0073] Similarly, it should be noted that, in order to simplify the description of this application disclosure and thus help the understanding of one or more inventive embodiments, in the foregoing description of the embodiments of this application, sometimes multiple features are grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiments are fewer than all the features of the single embodiment disclosed above.

[0074] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for disassembling threaded fasteners of a deformed test piece, Characterized in that, The disassembly method includes the following steps: S 1 , increase the tightening torque of the threaded fasteners on both sides of the bolt to be divided, so that the installation edge of the super turntable fits the installation edge of the adapter plate; S 2 , transfer the pressing surface of the bolt to be divided out of the cavity of the turbine disk through the first end of the bow-shaped transition section; S 3 Press the second end of the bow-shaped adapter section using a press, and press the end face of the bolt to be separated near the mounting edge of the super turntable; S 4 、Flip the arcuate adapter section by 180 degrees, transfer the head end face of the bolt to be disassembled out of the turbine disk through the second end of the arcuate adapter section, and use a press to press-fit the second end of the arcuate adapter section again to separate the bolt to be disassembled from the mounting hole.

2. The method for disassembling threaded fasteners of a deformed test piece according to claim 1, Characterized in that, The said step S 1 further includes: Determine whether the installation edge of the ultra-rotating disk fits with the installation edge of the adapter disk. If it fits, proceed to step S 2 ; If they cannot be fitted, clamping members are arranged in the pre-clamping areas on both sides of the bolt to be disassembled to further suppress the deformed area, so that the connecting edges of the test piece are fitted, and the bolt to be disassembled is straightened.

3. The method for disassembling threaded fasteners of a deformed test piece according to claim 1, Characterized in that, The step S 1 in which the tightening torque of the threaded fastener is less than or equal to 2.5 times the predetermined torque.

4. The method for disassembling threaded fasteners of a deformed test piece according to claim 1, Characterized in that, The step S 4 includes: at least one avoidance groove is formed at the second end of the bow-shaped adapter section, and the avoidance groove penetrates through the screw part of the bolt to be split.

5. The method for disassembling threaded fasteners of a deformed test piece according to claim 1, Characterized in that, The said step S 4 After that, it further includes: S 5 、Through the said step S 1 to the said step S 4 After that, half of the bolts to be divided are removed, and then bolts smaller than the diameter of the mounting holes are used to fill the spaces on both sides of the bolts to be divided. By increasing the bolt clamping force, the deformation on both sides of the bolts to be divided is suppressed, so that the mounting edge of the super turntable is fitted with the mounting edge of the adapter plate.

6. The method for disassembling threaded fasteners of a deformed test piece according to claim 5, Characterized in that, Judge whether the installation edge of the super turntable is fitted with the installation edge of the adapter plate. If it is fitted, proceed to the next step; If they cannot be fitted, clamping members are arranged in the pre-clamping areas on both sides of the bolt to be disassembled to further suppress the deformed area, so that the connecting edges of the test piece are fitted, and the bolt to be disassembled is straightened.

7. The method for disassembling threaded fasteners of a deformed test piece according to claim 2 or 6, Characterized in that, The clamping member includes a clamp or a threaded splint.

8. The method for disassembling threaded fasteners of a deformed test piece according to claim 5, Characterized in that, The said step S 5 After that, it further includes: S 6 Repeat the above step S 1 up to the above step S 5 to complete the disassembly of the remaining half of the bolts.

9. The method for disassembling threaded fasteners of a deformed test piece according to claim 1, Characterized in that, The said step S 5 After that, it further includes: S 7 , sequentially remove the adapter plate, the seal ring, and the super turntable to complete the disassembly of the test piece.

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