Decomposition process method for bonding connecting piece of high-temperature component

Abstract

The invention belongs to the technical field of engine connecting piece decomposition, and particularly relates to a high-temperature component bonding connecting piece decomposition process method which comprises the following steps that S1, a heating gun is used for heating a connecting piece; s2, after heating is conducted for the needed heating time, a prepared loosening agent is sprayed into the connecting piece, and sealing treatment is conducted; and S3, after the required sealing time is reached through sealing, decomposing equipment is used for decomposing the connecting piece. The connecting pieces comprise a combustion chamber connecting piece, a high vortex connecting piece, a low vortex connecting piece and a nozzle and turbine rear casing connecting piece; different loosening agents are selected for different connecting pieces. The method can be used for decomposing bonding connecting pieces of high-temperature parts after an engine works, the labor intensity of workers is reduced, and the quality of decomposed parts is improved; the problems of high rejection rate and the like caused by bonding of high-temperature part connecting pieces can be effectively reduced; by means of the method, the decomposition time of the high-temperature part connecting piece can be shortened to 0.5 h from original 2 h, and meanwhile the repair cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of engine connection piece decomposition, and in particular relates to a process for decomposing an adhesive connection piece of a high-temperature component. Background Art

[0002] After the aircraft engine is working, its hot end parts are subjected to high temperature and great stress. Under the dual effects of temperature and stress, its hot end parts connectors often have carbon deposits and rust. When the engine is disassembled, it is necessary to loosen its end face connectors before subsequent disassembly. However, due to the residual carbon deposits and rust on the connectors of the hot end parts of the engine (combustion chamber, turbine assembly, etc.), it is difficult to loosen the high temperature parts connectors. To solve this problem, it is necessary to design a disassembly process method for the connectors of high temperature parts. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a process method for decomposing adhesive connectors of high-temperature components, which can effectively improve the decomposition process of high-temperature component connectors, improve the quality of the parts after decomposition, reduce the decomposition scrap rate, and reduce the burden on operators during decomposition.

[0004] To achieve the above purpose, the specific technical solutions are as follows:

[0005] A method for decomposing a bonding connection of a high-temperature component comprises the following steps:

[0006] S1: Use a heating gun to heat the connector;

[0007] S2: After heating to the required heating time, spray the prepared loosening agent and kerosene into the connecting parts and perform sealing treatment;

[0008] S3: After sealing for the required sealing time, use the disassembly equipment to disassemble the connector.

[0009] Furthermore, the connecting parts are combustion chamber connecting parts, high vortex connecting parts, low vortex connecting parts, and nozzle and turbine rear casing connecting parts.

[0010] Furthermore, different loosening agents and kerosene are selected for different connecting parts.

[0011] Further, the loosening agent and kerosene are respectively:

[0012] Combustion chamber connections: Lenister: 20%; Kerosene: 80%;

[0013] High vortex connector: HS-190: 10%; WD-40: 10%; Lenister: 10%; Kerosene: 70%;

[0014] Low vortex connector: WD-40: 15%; Lenister: 5%; Kerosene: 80%;

[0015] Nozzle and turbine rear casing connections: HS-190: 30%; Lenister: 10%; Kerosene: 60%.

[0016] Furthermore, after spraying the prepared loosening agent and kerosene, the grease is applied within 1 minute for sealing.

[0017] Furthermore, the required sealing time is 12 hours.

[0018] Furthermore, different heating times are required depending on the different thermal expansion coefficients of the adjacent parts of the connector of the high-temperature component.

[0019] Further, the S1 includes:

[0020] Use a heating gun and adjust the temperature of the heating gun to 270°C. When the heating gun reaches 270°C, heat the connecting parts.

[0021] Furthermore, the required heating time is 25 min.

[0022] The beneficial effects of the present invention are:

[0023] This method can be used to disassemble the bonded connectors of high-temperature components after the engine is working, reduce the labor intensity of workers, and improve the quality of the parts after disassembly; it can effectively reduce the high scrap rate caused by the bonding of high-temperature component connectors; through this patented method, the disassembly time of high-temperature component connectors can be reduced from the original 2h to 0.5h, while reducing the repair cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A flow chart of a process for decomposing a bonding connection of a high-temperature component according to the present invention;

[0025] Figure 2 The first is the surface morphology of the connecting bolt before spraying the loosening agent in the embodiment;

[0026] Figure 3 The second surface morphology of the connecting bolt before spraying the loosening agent in the embodiment;

[0027] Figure 4 The third surface morphology of the connecting bolt before spraying the loosening agent in the embodiment;

[0028] Figure 5 The first is the surface morphology of the connecting bolt after spraying the loosening agent in the embodiment;

[0029] Figure 6 The second surface morphology of the connecting bolt after spraying the loosening agent in the embodiment;

[0030] Figure 7 The third surface morphology of the connecting bolt after spraying the loosening agent in the embodiment;

[0031] Figure 8 This is the morphology of the transverse corrosion layer of the connecting bolt after spraying the loosening agent in the embodiment;

[0032] Fig. 9 This is the morphology of the longitudinal corrosion layer of the connecting bolt after spraying the loosening agent in the embodiment. DETAILED DESCRIPTION

[0033] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, this embodiment provides a method for decomposing a bonding connection of a high-temperature component, and the specific steps are as follows:

[0035] S1: According to the different thermal expansion coefficients of the adjacent parts of the connector of the high-temperature component, a heating gun is used to heat the connector; specifically, the thermal expansion coefficients of the adjacent parts of the connector in this embodiment are similar, and the same heating temperature and heating time are used for the connector. First, the temperature of the heating gun is adjusted to 270°C, and then the connector is heated for 25 minutes;

[0036] Wherein, the connecting parts are combustion chamber connecting parts, high vortex connecting parts, low vortex connecting parts, and nozzle and turbine rear casing connecting parts;

[0037] S2: After heating the connector for the required heating time, spray the prepared loosening agent and kerosene into the connector and perform sealing treatment;

[0038] Different loosening agents and kerosene are used for different connectors, and they are prepared according to the volume ratio, as shown in the following table.

[0039]

[0040]

[0041] S3: After the connector is sealed for a time required for sealing, the connector is decomposed using a decomposition device;

[0042] Among them, after spraying the prepared loosening agent and kerosene, grease is applied for sealing within 1 minute to prevent the loosening agent and kerosene from volatilizing due to high temperature and losing the loosening effect; after sealing for 12 hours, use high-torque connector disassembly equipment to disassemble it.

[0043] In order to verify the feasibility of using mixed solvent lubrication when disassembling the connecting parts of the combustion chamber, the following test plan was formulated:

[0044] First, 6 overhauled engines were selected, and a certain type of connecting bolts in the combustion chambers of 3 engines were sprayed with loosening agent and kerosene mixed solvent respectively, and then left to stand for 12 hours for testing. The 3 engines were not sprayed with mixed solvent for control group testing, and the loosening torque of a certain type of connecting bolts was tested and analyzed. The details are shown in the following table

[0045]

[0046] From the loosening torque tested in the above table, it can be seen that the loosening torque can be reduced by about 20% after using loosening agent and kerosene soaking for 12 hours.

[0047] Second, there are generally three types of loosening agents commonly used at present, WD-40 (dehumidification and anti-rust lubricant), HS-190 (rust loosening lubricant) and Lenister (loosening agent), the main function of which is to remove rust and chalk paste residue after sintering, and the main function of kerosene is lubrication and loosening; the loosening agent of the present invention has different characteristics according to the different connectors used for high-temperature components, such as different chemical properties of different metals, different corrosion resistance, etc. WD-40, HS-190, Lenister and kerosene are formulated in proportion to design a loosening agent that meets the use of different connectors.

[0048] Experiments were conducted on the combustion chamber connectors. The proportion of loosening agents and kerosene in the loosening of the connecting bolts was optimized. According to the different effects of loosening agents and kerosene and the characteristics of a certain type of connecting bolts in the combustion chamber, the following grouping experimental plan was formulated, as shown in the following table.

[0049]

[0050]

[0051] It can be seen from the above table that in the process of decomposing a certain type of connecting bolts of the combustion chamber, due to its bonding characteristics (less rust and chalk paste), when the kerosene proportion reaches 80%, the average loosening torque is the smallest, which is 253N·m.

[0052] Experiments were conducted on high-vortex connectors. The proportion of loosening agents and kerosene was optimized according to their roles in loosening high-vortex connectors. According to the different roles of loosening agents and kerosene and the characteristics of high-vortex connectors, the following grouping experimental plan was formulated, as shown in the following table.

[0053]

[0054] It can be seen from the above table that in the process of decomposing high-vortex connectors, due to their bonding characteristics, when decomposing, when HS-190: 10%; WD-40: 10%; Lenister: 10%; Kerosene: 70%; the average loosening torque is the smallest, which is 126N·m.

[0055] Experiments were conducted on low-vortex connectors. The proportion of loosening agents and kerosene was optimized according to their roles in loosening low-vortex connectors. According to the different roles of loosening agents and kerosene and the characteristics of low-vortex connectors, the following grouping experimental plan was formulated, as shown in the following table.

[0056]

[0057] It can be seen from the above table that in the process of decomposing the low-vortex connector, due to its bonding characteristics, when decomposing, when WD-40: 15%; Lenister: 5%; Kerosene: 80%;, the average loosening torque is the smallest, which is 98N·m.

[0058] Experiments were conducted on the nozzle and turbine rear casing connectors. The proportion of loosening agent and kerosene in the loosening of the nozzle and turbine rear casing connectors was optimized and designed. According to the different effects of loosening agent and kerosene and the characteristics of the nozzle and turbine rear casing connectors, the following grouping experimental plan was formulated, as shown in the following table.

[0059]

[0060]

[0061] It can be seen from the above table that during the disassembly of the nozzle and turbine rear casing connector, due to their bonding characteristics, when HS-190: 30%; Lenister: 10%; Kerosene: 60%; the average loosening torque is the smallest, which is 109N·m.

[0062] In addition, the effects of the use of HS-190, WD-40 and Lenister on the chemical properties of metals were tested.

[0063] 1. Two bottles of HS-190, WD-40 and Lenister, each with a specification of 40ml;

[0064] Second, prepare a certain type of connecting bolts and prepare a temporary process card, specifically:

[0065] 1. First, analyze the surface composition of a certain type of connecting bolts. Divide the connecting bolts of a certain type into three groups, 4 pieces in each group, a total of 12 pieces. Number all the connecting bolts of a certain type. After numbering, a professional analysis agency will conduct surface composition analysis (before spraying lubricant);

[0066] 2. Hold the HS-190, WD-40 and Lenister spray cans in the three groups (a total of 12 pieces) in turn, and place them vertically 15mm-20mm above the surface of the parts to be treated, and spray them until the surface is completely soaked. After soaking, dry them naturally in the air, and classify them according to the soaking time and spraying type as shown in Table 1 below;

[0067]

[0068] 3. Visually inspect the surface condition of a certain type of connecting bolts to see if there is corrosion or discoloration and record it;

[0069] 4. Send the 12 pieces after infiltration and the previous numbers to a professional analysis agency for surface composition analysis (after spraying lubricant); 3. Corrosion layer detection

[0070] 1. Cut the above 12 pieces of a certain type of connecting bolts along the axis and send them to a professional analysis agency for corrosion layer detection according to the previous number (before spraying lubricant);

[0071] 2. Hold the 12 cut connecting bolts of a certain model in turn with HS-190, WD-40 and Lenister spray cans, hold them vertically and spray them 15mm-20mm above the surface of the parts to be treated until the surface is completely soaked. After soaking, dry them naturally in the air and classify them according to the soaking time and spraying type according to Table 1 above;

[0072] 3. Send the 12 pieces of a certain type of connecting bolts after infiltration to a professional analysis agency for corrosion layer detection according to the previous number (after spraying lubricant);

[0073] 4. Conclusion

[0074] 1. If Figure 2-Figure 7 As shown, the surface morphology of a certain type of connecting bolts before and after spraying the loosening agent showed no corrosion morphology; a professional analysis agency used energy spectrum method to analyze the surface composition of a certain type of connecting bolts, and the result showed that no corrosive elements were found in the chemical composition of the surface before and after spraying the loosening agent.

[0075] 2. If Figure 8-Figure 9 As shown, a professional analysis agency used the metallographic method to conduct horizontal and vertical corrosion layer inspections on a certain type of connecting bolts before and after spraying the loosening agent, and no corrosion pits were found.

Claims

1. A process for decomposing adhesive joints of high temperature components, characterized in that: The steps include: S1: Use a heating gun to heat the connector; S2: After heating to the required heating time, spray the prepared loosening agent and kerosene into the connecting parts and perform sealing treatment; S3: After sealing for the required sealing time, use the disassembly equipment to disassemble the connector.

2. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: The connecting parts are combustion chamber connecting parts, high vortex connecting parts, low vortex connecting parts, and nozzle and turbine rear casing connecting parts.

3. The method for decomposing adhesively bonded parts of high-temperature components according to claim 2, characterized in that: Different loosening agents and kerosene are used for different connecting parts.

4. The method for decomposing adhesively bonded parts of high-temperature components according to claim 3, characterized in that: The loosening agent and kerosene are: Combustion chamber connections: Lenister: 20%; Kerosene: 80%; High vortex connector: HS-190: 10%; WD-40: 10%; Lenister: 10%; Kerosene: 70%; Low vortex connector: WD-40: 15%; Lenister: 5%; Kerosene: 80%; Nozzle and turbine rear casing connector: HS-190: 30%; Lenister: 10%; Kerosene: 60%.

5. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: After spraying the prepared loosening agent and kerosene, apply grease to seal within 1 minute.

6. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: The required sealing time is 12h.

7. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: The required heating time varies depending on the different thermal expansion coefficients of the connecting parts and adjacent parts of the high-temperature components.

8. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: The S1 includes: Use a heating gun and adjust the temperature of the heating gun to 270°C. When the heating gun reaches 270°C, heat the connecting parts.

9. The method for decomposing adhesively bonded parts of high-temperature components according to claim 1, characterized in that: The required heating time is 25 minutes.

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