A decomposition process for adhesive connectors of high-temperature components

Abstract

This invention belongs to the field of engine connector disassembly technology, and particularly relates to a process method for disassembling bonded connectors of high-temperature components, comprising the following steps: S1: heating the connector using a heating gun; S2: after heating for the required time, spraying a prepared loosening agent into the connector and sealing it; S3: after sealing for the required sealing time, disassembling the connector using a disassembly device. The connectors include combustion chamber connectors, high-vortex connectors, low-vortex connectors, and nozzle and turbine rear casing connectors; different loosening agents are used for different connectors. This method can be used to disassemble bonded connectors of high-temperature components after engine operation, reducing labor intensity and improving the quality of disassembled parts; it can effectively reduce the high scrap rate caused by bonding of high-temperature component connectors; through this patented method, the disassembly time of high-temperature component connectors can be reduced from the original 2 hours to 0.5 hours, while also reducing repair costs.

Description

Technical Field

[0001] This invention belongs to the field of engine connector disassembly technology, and particularly relates to a disassembly process method for adhesive connectors of high-temperature components. Background Technology

[0002] After an aero-engine starts operating, its hot-end components are subjected to high temperatures and significant stress. Under the combined effects of temperature and stress, carbon deposits and corrosion often occur on the connectors of these hot-end components. When the engine is disassembled, these connectors must be loosened before further disassembly can proceed. However, due to the significant amount of residual carbon deposits and corrosion on the connectors of hot-end components (combustion chamber, turbine assembly, etc.), it is difficult to loosen the connectors of high-temperature components. To solve this problem, a disassembly process method needs to be designed specifically for the connectors of high-temperature components. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a decomposition process for adhesive connectors of high-temperature components, which can effectively improve the decomposition process of high-temperature component connectors, improve the quality of the decomposed parts, reduce the scrap rate, and reduce the burden on operators during decomposition.

[0004] To achieve the above objectives, the specific technical solution adopted is as follows:

[0005] A method for decomposing adhesive connectors in high-temperature components includes 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 connector and seal it.

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

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

[0010] Furthermore, different loosening agents and kerosene are used for different connectors.

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

[0012] Combustion chamber connectors: Reigen: 20%; Kerosene: 80%;

[0013] High-pressure vortex connectors: HS-190: 10%; WD-40: 10%; Reijister: 10%; Kerosene: 70%;

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

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

[0016] Furthermore, after spraying in the prepared loosening agent and kerosene, apply lubricant and seal within 1 minute.

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

[0018] Furthermore, the required heating time varies depending on the different coefficients of thermal expansion of the connecting parts of the high-temperature components and the adjacent components.

[0019] Furthermore, S1 includes:

[0020] Using a heating gun, set the temperature to 270°C. Once the heating gun reaches 270°C, heat the connector.

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

[0022] The beneficial effects of this invention are as follows.

[0023] This method can be used to disassemble the bonded connectors of high-temperature components after engine operation, reducing the labor intensity of workers and improving the quality of disassembled parts; 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 2 hours to 0.5 hours, while reducing repair costs. Attached Figure Description

[0024] Figure 1 This is a flowchart of the decomposition process of the bonding connector for a high-temperature component according to the present invention;

[0025] Figure 2 The first example shows the surface morphology of the connecting bolts before the loosening agent was sprayed.

[0026] Figure 3 The second example shows the surface morphology of the connecting bolts before the loosening agent was sprayed.

[0027] Figure 4 The third example shows the surface morphology of the connecting bolts before the loosening agent was sprayed.

[0028] Figure 5 The first example shows the surface morphology of the connecting bolts after spraying the loosening agent.

[0029] Figure 6 The second example shows the surface morphology of the connecting bolts after spraying the loosening agent.

[0030] Figure 7 The third example shows the surface morphology of the connecting bolts after spraying the loosening agent.

[0031] Figure 8 This example shows the morphology of the transverse corrosion layer on the connecting bolts after spraying the loosening agent.

[0032] Figure 9 The image shows the morphology of the longitudinal corrosion layer on the connecting bolts after the loosening agent was sprayed in the example. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the technical solution and effects of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 As shown, this embodiment provides a decomposition process method for adhesive connectors of high-temperature components, and the specific steps are as follows:

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

[0036] The connecting components include a combustion chamber connecting component, a high-vortex connecting component, a low-vortex connecting component, and a nozzle and turbine rear casing connecting component.

[0037] S2: After heating the connector to the required heating time, spray the connector with the prepared loosening agent and kerosene and seal it.

[0038] Different loosening agents and kerosene are used for different connectors, and the specific formulations are based on volume ratios, as shown in the table below.

[0039] HS-190 WD-40 Leist kerosene Combustion chamber connection 0 0 20% 80% High-vortex connector 10% 10% 10% 70% Low-vortex connector 0 15% 5% 80% Nozzle and turbine rear casing connector 30% 0 10% 60%

[0040] S3: After sealing the connector for the required time, use a disassembly device to disassemble the connector;

[0041] The process involves spraying in the prepared loosening agent and kerosene, then applying lubricant and sealing the parts within 1 minute to prevent the loosening agent and kerosene from evaporating due to high temperature and losing their loosening effect. After sealing for 12 hours, the parts are disassembled using a high-torque connector disassembly device.

[0042] To verify the feasibility of using mixed solvent lubrication when connecting components in the combustion chamber, the following test plan was developed:

[0043] First, six engines that had reached the end of their service life after overhaul were selected. For three of these engines, a certain type of connecting bolt in the combustion chamber was sprayed with a loosening agent and a kerosene-based mixed solvent. After standing for 12 hours, tests were conducted. The remaining three engines were not sprayed with the mixed solvent and served as a control group. The loosening torque of the certain type of connecting bolt was measured, and its analysis is shown in the table below.

[0044]

[0045] As can be seen from the loosening torque tested in the table above, soaking in loosening agent and kerosene for 12 hours can reduce the loosening torque by about 20%.

[0046] Second, there are generally three types of loosening agents commonly used at present: WD-40 (dehumidifying and rust-preventing lubricant), HS-190 (rust-releasing lubricant), and Reijister (loosening agent). Their main function is to remove rust and chalk residue after sintering. Kerosene mainly serves to lubricate and loosen. The loosening agent of this invention has different characteristics depending on the connecting parts used in high-temperature components. For example, different metals have different chemical properties and different corrosion resistance. WD-40, HS-190, Reijister, and kerosene are mixed in proportion to design a loosening agent that meets the needs of different connecting parts.

[0047] Experiments were conducted on combustion chamber connectors. The proportions of loosening agents and kerosene were optimized based on their roles in the loosening of connecting bolts. The following grouped experimental scheme was developed based on the different effects of loosening agents and kerosene, and the characteristics of a specific type of connecting bolt in the combustion chamber, as detailed in the table below.

[0048]

[0049] As can be seen from the table above, during the decomposition of a certain type of connecting bolt in the combustion chamber, due to its adhesive characteristics (less rust and chalk paste), the average loosening torque is the smallest, which is 253 N·m, when the kerosene content reaches 80%.

[0050] Experiments were conducted on high-vortex connectors. The proportions of loosening agents and kerosene were optimized based on their roles in the loosening process. The following grouped experimental schemes were developed based on the different effects of loosening agents and kerosene, as well as the characteristics of high-vortex connectors, as detailed in the table below.

[0051]

[0052] As can be seen from the table above, during the decomposition of high-vortex connectors, due to their adhesive characteristics, the average loosening torque is the smallest, at 126 N·m, when HS-190: 10%; WD-40: 10%; Reidist: 10%; kerosene: 70%.

[0053] Experiments were conducted on low-vortex connectors. The proportions of loosening agents and kerosene were optimized based on their roles in the loosening process. The following grouped experimental schemes were developed based on the different effects of loosening agents and kerosene, as well as the characteristics of the low-vortex connectors, as detailed in the table below.

[0054]

[0055] As can be seen from the table above, during the decomposition of the low-vortex connector, due to its adhesive characteristics, the average loosening torque is the smallest, which is 98 N·m, when WD-40: 15%; Reidil: 5%; kerosene: 80%.

[0056] Experiments were conducted on the nozzle and turbine rear casing connectors. The proportions of loosening agent and kerosene were optimized based on their roles in the loosening process. The following grouped experimental schemes were developed based on the different effects of the loosening agent and kerosene, as well as the characteristics of the nozzle and turbine rear casing connectors, as detailed in the table below.

[0057]

[0058] As can be seen from the table above, during the disassembly of the nozzle and turbine rear casing connector, due to their adhesive characteristics, the average loosening torque is the smallest, which is 109 N·m, when HS-190: 30%; Reidest: 10%; kerosene: 60%.

[0059] In addition, experiments were conducted to investigate the effects of the use of HS-190, WD-40, and Reigerst on the chemical properties of the metal.

[0060] Two bottles each of HS-190, WD-40, and Registem, each bottle containing 40ml;

[0061] Prepare a certain type of connecting bolt and compile a temporary process card, as follows:

[0062] 1. First, the surface composition of a certain type of connecting bolt was analyzed. The connecting bolts of a certain type were divided into three groups of 4 pieces each, for a total of 12 pieces. All connecting bolts of a certain type were numbered, and then the surface composition was analyzed by a professional analysis institution (before the lubricant was sprayed).

[0063] 2. Hold the HS-190, WD-40 and Registe spray cans of the above three groups of 12 pieces in turn, hold them vertically and position them 15mm-20mm above the surface of the parts to be treated, and spray them until the surface is completely wetted. After wetting, let them air dry naturally in the air. According to the wetting time and spray type, classify them as shown in Table 1 below.

[0064]

[0065] 3. Visually inspect the surface of a certain type of connecting bolt for signs of corrosion, discoloration, etc., and record the findings.

[0066] 4. After soaking, the 12 pieces and their previous numbers were sent to a professional analysis institution for surface composition analysis (after spraying lubricant).

[0067] 3. Corrosion layer detection

[0068] 1. After cutting the above 12 connecting bolts of a certain model along the axis, send them to a professional analysis institution for corrosion layer testing according to the previous number (before spraying lubricant);

[0069] 2. Hold the 12 cut connecting bolts of a certain model in sequence, and spray them with HS-190, WD-40 and Reijister spray cans, keeping them vertical and 15mm-20mm above the surface of the parts to be treated, until the surface is completely wetted. After wetting, let them air dry naturally. According to the wetting time and spray type, classify them according to Table 1 above.

[0070] 3. After being soaked, 12 connecting bolts of a certain model were sent to a professional analysis institution for corrosion layer testing according to their previous numbers (after spraying lubricant).

[0071] IV. Experimental Conclusions

[0072] 1. For example Figures 2-7 As shown, no corrosion morphology was observed on the surface of a certain type of connecting bolt before and after spraying with a loosening agent; the surface composition analysis of the certain type of connecting bolt by a professional analysis institution using energy dispersive spectroscopy showed that no corrosive elements were found in the chemical composition of the surface before and after spraying with the loosening agent.

[0073] 2. For example Figures 8-9 As shown, a professional analysis institution used metallography to detect the corrosion layer of a certain type of connecting bolt before and after spraying the loosening agent in both the transverse and longitudinal directions, and no corrosion pit morphology was found in either case.

Claims

1. A decomposition process for adhesive connectors in high-temperature components, characterized in that, Includes the following steps: 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 connector and seal it. S3: After sealing for the required sealing time, use a disassembly device to disassemble the connector; The connecting parts are combustion chamber connecting parts, high vortex connecting parts, low vortex connecting parts, and nozzle and turbine rear casing connecting parts; Different loosening agents and kerosene are used for different connectors; The loosening agent and kerosene are respectively: Combustion chamber connectors: Reigen: 20%; Kerosene: 80%; High-voltage vortex connectors: HS-190: 10%; WD-40: 10%; Reijister: 10%; Kerosene: 70%; Low-vortex connector: WD-40: 15%; Reiester: 5%; Kerosene: 80%; Nozzle and turbine rear casing connector: HS-190: 30%; Reiester: 10%; Kerosene: 60%.

2. The decomposition process method for adhesive connectors of high-temperature components according to claim 1, characterized in that, After spraying in the prepared loosening agent and kerosene, apply lubricant and seal within 1 minute.

3. The decomposition process method for adhesive connectors of high-temperature components according to claim 1, characterized in that, The required sealing time is 12 hours.

4. The decomposition process method for adhesive connectors of high-temperature components according to claim 1, characterized in that, The required heating time varies depending on the different coefficients of thermal expansion of the connecting parts of the high-temperature component and the adjacent parts.

5. The decomposition process method for adhesive connectors of high-temperature components according to claim 1, characterized in that, S1 includes: Using a heating gun, set the temperature to 270°C. Once the heating gun reaches 270°C, heat the connector.

6. The decomposition process method for adhesive connectors of high-temperature components according to claim 1, characterized in that, The required heating time is 25 minutes.

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