Method for maintaining cylinder barrel of aluminum thin-wall air cylinder

Abstract

The invention relates to the technical field of air cylinder maintenance, in particular to an aluminum thin-wall air cylinder barrel maintenance method which comprises the steps that a cylinder barrel is fixed, and a damaged area on the inner wall of the cylinder barrel is cleaned; the damaged area of the cylinder barrel is polished; multiple rounds of flame scanning are conducted on the grinding area, and the single-time scanning time is decreased progressively along with increase of the scanning frequency; cleaning and drying the heating area; the damaged area is coated with a filling agent and cured; and after first-time curing, grinding is carried out through raw abrasive paper till the piston is not blocked in push-pull, after second-time curing, grinding is carried out through fine abrasive paper till the piston is flush with an undamaged area, and after third-time curing, grinding is carried out through water wet polishing abrasive paper till the set roughness range is achieved. The limitation that the thin-wall cylinder barrel cannot be repaired after being damaged and deformed due to the thin cylinder wall is broken through, the maintenance working efficiency can be effectively improved, the maintenance time is shortened, and the maintenance cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cylinder repair, and particularly relates to a repairing method for an aluminum thin-wall cylinder. BACKGROUND

[0002] The aluminum thin-wall cylinder is widely used in automatic equipment, pneumatic machinery and other scenes due to its lightweight design and corrosion resistance, and the working principle is to realize mechanical energy conversion through the reciprocating movement of the piston in the cylinder. The inner wall of the cylinder needs to maintain high-precision roughness to ensure the sealing and smoothness. However, during use, the long-term high-frequency piston movement of the cylinder causes the cylinder to be worn and scratched.

[0003] Due to the low hardness and high thermal conductivity of the thin-wall aluminum material, traditional turning repair may cause uneven wall thickness or thermal deformation, and the existing repair process is only suitable for thick-wall iron cylinders and cannot meet the deformation control requirements of the aluminum thin-wall cylinder. Therefore, the current industry mainly uses the whole replacement method to repair the damaged aluminum thin-wall cylinder, which has high maintenance cost and long downtime. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a repairing method for an aluminum thin-wall cylinder, which breaks the limitation that the damaged thin-wall cylinder cannot be repaired due to its thin wall and deformation, effectively improves the work efficiency of the repair, shortens the repair time, saves the repair cost, and avoids the whole replacement method for repair.

[0005] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions: A repairing method for an aluminum thin-wall cylinder, comprising: fixing the cylinder and cleaning the damaged area of the inner wall of the cylinder; grinding the damaged area of the cylinder; performing multiple rounds of flame scanning on the grinding area, and the single scanning time decreases with the increase of the scanning times; cleaning and drying the heating area; coating the filler in the damaged area and solidifying; sequentially performing three times of grinding: grinding with coarse sandpaper after the first solidification until the piston is not jammed, grinding with fine sandpaper after the second solidification until the damaged area is flush with the undamaged area, and grinding with water-wetted polishing sandpaper after the third solidification until the set roughness range is reached.

[0006] Optionally, a gas cutting gun is used to perform flame scanning on the grinding area of the cylinder, and the flame of the gas cutting gun is controlled to be neutral flame.

[0007] Optionally, the single scanning time of the flame scanning satisfies: the first scanning time is longer than the second scanning time, and the second scanning time is longer than the subsequent scanning time, and the first scanning time is not more than 1.5 seconds.

[0008] Optionally, the second scanning time is not more than 1 second, and the subsequent scanning time is not more than 0.5 second.

[0009] Optionally, the filling agent is AB glue, and the thickness of the filling agent is higher than the thickness of the undamaged part of the inner wall of the cylinder barrel.

[0010] Optionally, the solidification process of the filling agent comprises: the first polishing is performed after 1 hour of solidification using 80 mesh sandpaper, the second polishing is performed after 2 hours of solidification using 600 mesh sandpaper, and the third polishing is performed after 24 hours of solidification by wetting with pure water and then using 2000 mesh sandpaper.

[0011] Optionally, after the polishing is completed, vaseline is applied to the inner side of the cylinder barrel, and a protective film is formed on the inner wall of the cylinder barrel after the application.

[0012] Optionally, the method further comprises a parameter self-adaptive step: measuring the minimum wall thickness of the cylinder barrel; obtaining the basic scanning times from a parameter reference table based on the cylinder barrel model, the minimum wall thickness, and the damage depth; calculating the maximum single scanning time according to the minimum wall thickness; dynamically adjusting the scanning speed according to the real-time temperature during the scanning.

[0013] Optionally, the maximum single scanning time is obtained by subtracting the product of the difference between the minimum wall thickness and the reference wall thickness and a compensation coefficient from the reference time value, wherein the compensation coefficient is 0.5 s / mm.

[0014] Optionally, the method further comprises a parameter optimization step: recording the actual scanning times and the highest temperature, and updating the parameter reference table when the effective data of the same model cylinder reaches a set number after verification by the air pressure sealing test.

[0015] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: The aluminum thin-walled cylinder barrel repair method can avoid deformation of the cylinder barrel during processing, can remove surface impurities by cleaning the damaged area, and can lay a foundation for subsequent processing; the damaged area can be polished to eliminate scratches and expand the processing range, which facilitates the adhesion of the filling agent; the number of times of the multi-round flame scanning is decreased with the single scanning time, which can gradually remove the penetrated lubricating oil and control the temperature of the cylinder barrel to avoid deformation of the thin-walled cylinder barrel due to overheating; the cleaning and drying can remove the residues after heating; the filling agent is polished three times after being coated, and the three-stage polishing is matched with the solidification progress: the first rough polishing eliminates geometric interference, the second fine polishing restores the geometric and positional accuracy, and the third polishing realizes the surface function adaptation. The multi-stage solidification and the sandpaper with increasing mesh number cooperatively control the shrinkage stress of the filling agent to prevent interlayer peeling. The repair method solves the problem that the aluminum thin-walled cylinder barrel cannot be repaired and can only be replaced due to thin wall and easy deformation, realizes effective repair, reduces the repair cost, and shortens the repair time.

[0016] Advantages of the additional aspects of the application will be apparent from the following description, which will become more fully understood by reference to the following description, taken in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0017] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, it should be noted that the use of the terms“comprise” and / or“comprising” as used herein is intended to have an inclusive meaning, such that any stated features, steps, processes, devices, components and / or combinations thereof are included.

[0018] Example 1 The embodiment proposes a method for repairing an aluminum thin-walled cylinder barrel, comprising: fixing the cylinder barrel and cleaning the damaged area of the inner wall of the cylinder barrel; grinding the damaged area of the cylinder barrel; performing multiple rounds of flame scanning on the ground area, and the single scanning time decreases with the increase of the scanning times; cleaning and drying the heated area; coating the filler in the damaged area and solidifying; sequentially performing three times of grinding: using coarse sandpaper to grind after the first solidification until the piston is not jammed, using fine sandpaper to grind after the second solidification until it is flush with the undamaged area, and using water-wetted polishing sandpaper to grind after the third solidification until the set roughness range is reached.

[0019] First, the cylinder barrel is fixed and the damaged area of the inner wall of the cylinder barrel is cleaned, which ensures the accuracy and effectiveness of the subsequent operation and provides a good foundation for the subsequent repair work. Then, the damaged area of the cylinder barrel is ground to remove burrs and irregular parts of the damaged part, which prepares for the subsequent filling and leveling.

[0020] Then, multiple rounds of flame scanning are performed on the ground area, and the single scanning time decreases with the increase of the scanning times, which ensures the heating effect while avoiding local overheating of the cylinder barrel due to long-time heating, thereby affecting the overall performance of the cylinder barrel. Flame scanning can effectively remove oil stains and impurities on the inner wall of the cylinder barrel, and at the same time, it can perform a certain degree of heat treatment on the surface of the cylinder barrel, improve the surface activity, and be beneficial to the adhesion of the filler.

[0021] Cleaning and drying the heated area ensures that the filler can be closely attached to the inner wall of the cylinder barrel, improving the repair quality.

[0022] The filler is coated in the damaged area and solidified, which is used to fill the damaged part of the cylinder barrel and restore the shape and dimensional accuracy of the cylinder barrel. Through the solidification process, the filler forms an integral whole with the inner wall of the cylinder barrel, enhancing the structural strength of the cylinder barrel.

[0023] Three polishing operations are performed in sequence, each using a different grit of sandpaper and at a specific time node. After the first solidification, the rough sandpaper is used to polish the piston push and pull without jamming, which can quickly remove the excess material after the filler solidifies, making the cooperation between the filled area and the piston more smooth. After the second solidification, the fine sandpaper is used to polish to the same level as the undamaged area, further improving the flatness of the filled area, making the transition to the surrounding undamaged area more natural. After the third solidification, the polishing sandpaper is wetted with water to polish to the specified roughness range, which can make the cylinder inner wall reach the required roughness, ensuring the smoothness of the surface without over-weakening the strength of the cylinder, while improving the wear resistance and corrosion resistance of the cylinder inner wall.

[0024] The above steps cooperate with each other to solve the problems encountered in the repair of aluminum thin-walled cylinder, realize efficient repair of damaged cylinder, prolong the service life of the cylinder, reduce the repair cost and reduce the repair time.

[0025] The flame of the gas cutting gun is controlled to be neutral flame. The neutral flame has stable core temperature and clear profile, and the reduction area has low brightness, which can provide enough heat to remove the penetrated lubricating oil in the cylinder inner wall, and will not cause local overheating of the cylinder due to too strong flame. It is suitable for the material characteristics of aluminum thin-walled cylinder, avoids deformation of the cylinder during heating, ensures the adhesion effect of the subsequent filler, cooperates with the polishing and filling steps, and improves the reliability of the repair.

[0026] The single scanning time of the flame scanning satisfies: the first scanning time is longer than the second scanning time, which is longer than the subsequent scanning time, and the first scanning time is not more than 1.5 seconds. The upper limit of 1.5 seconds for the first scanning ensures the vaporization of the base oil film, and the decreasing of the subsequent scanning time adapts to the heat accumulation effect. When the temperature gradient of the cylinder is established, shortening the heating time can not only maintain the effective temperature window, but also prevent overheating.

[0027] Further, the second scanning time is not more than 1 second, and the subsequent scanning time is not more than 0.5 second. With the increase of scanning times, the residual amount of lubricating oil in the cylinder decreases, and shortening the time can avoid unnecessary heat input, especially for thin-walled cylinder, which can more accurately control the temperature to prevent local overheating from causing deformation. It matches the need of gradually cleaning the lubricating oil, and ensures that each scanning is efficient and safe.

[0028] Specifically, the filler can use AB glue, and the thickness is higher than that of the undamaged area of the cylinder inner wall. AB glue has certain strength and sealing property after solidification, which is suitable for the repair of aluminum cylinder; the thickness is higher than that of the undamaged area, which provides a margin for subsequent polishing, ensures that the polished surface is flush with the undamaged surface after two or three polishing, and cooperates with the three polishing steps to ensure that the polished cylinder inner wall is smooth and continuous, meets the requirements of cylinder movement, and solves the problem of thin-walled cylinder that cannot be repaired by turning.

[0029] The solidification process of the filling agent includes: the first polishing is performed with 80 mesh sandpaper after 1 hour of solidification, the second polishing is performed with 600 mesh sandpaper after 2 hours of solidification, and the third polishing is performed with 2000 mesh sandpaper after 24 hours of solidification, and then the filling area is immersed in pure water.

[0030] The solidification and polishing process is adapted to the solidification characteristics of the AB glue and the requirements of the cylinder repair: after 1 hour of solidification, the AB glue has a certain strength, at this time, the 80 mesh sandpaper is used for polishing to quickly remove the excess material, so that the filling area is not jammed when the piston is pushed and pulled; after 2 hours of solidification, the glue is further solidified, and the 600 mesh sandpaper is used for fine polishing to make the filling area flush with the undamaged area; after 24 hours of solidification, the glue reaches a high strength and stability, at this time, the water is used to wet and the 2000 mesh sandpaper is used for polishing, which can make the inner wall of the cylinder reach the required roughness range, improve the surface quality and wear resistance. The time interval between each polishing step and the selection of the mesh number of the sandpaper fully consider the solidification stage of the AB glue and the use requirements of the aluminum cylinder, ensure that the roughness of the inner wall of the repaired cylinder meets the use requirements, and ensure the reliability and durability of the repair effect.

[0031] After polishing, vaseline is applied to the inside of the cylinder, which can form a protective film on the inner wall of the cylinder to isolate air, moisture and dust, prevent the repaired inner wall of the cylinder from being corroded or contaminated, especially protect the polished smooth surface before assembly, prolong the service life of the repaired cylinder, maintain the surface quality after repair, and improve the use stability of the cylinder.

[0032] The detailed steps are as follows: S100 Preparation work before repair: S101 Material preparation: according to the repair requirements, prepare the corresponding specifications of sealing elements, vaseline, AB glue, 80 mesh sandpaper, 600 mesh sandpaper, 2000 mesh sandpaper, pure water, 1 bottle of oxygen, 1 bottle of acetylene and other materials.

[0033] S102 Tool preparation: prepare the corresponding repair tools, such as wrench, screwdriver, rubber hammer, gas cutting gun, bench vice, cotton cloth, etc.

[0034] S200 Repair process: S201 Disassemble the cylinder, place the piston rod (including the piston), front end cover, cylinder and rear end cover respectively, without disassembling all the undamaged parts of the cylinder, keep the integrity of each part.

[0035] S202 Wrap the cylinder with wet cotton cloth and fix it with a bench vice, the force should be controlled to clamp the cylinder without deforming it.

[0036] S203 Clean the inside of the cylinder with cotton and check the damage degree of the inside of the cylinder.

[0037] S204 Polish the damaged part of the inside of the cylinder with 80-mesh sandpaper, the polishing range is 10 mm outward from the damage edge, and the surface oil film for lubrication is polished as clean as possible.

[0038] S205 Connect the oxygen and acetylene to the gas cutting torch and ignite it, control the flame of the gas cutting torch to be neutral, and the flame core has a clear outline (close to a cylinder). The composition of the flame core is acetylene and oxygen, and the end is uniform and bright. The outer shell is composed of red-hot carbon particles. The temperature of the flame core reaches 1000℃. The reduction zone is outside the flame core, and the obvious difference from the flame core is that it is darker in brightness.

[0039] S206 Because there is a certain oil film on the inside of the cylinder, and as the use time of the cylinder increases, a small amount of lubricating oil penetrates into the cylinder wall, the damaged polishing part of the inside of the cylinder is treated by scanning heating with a neutral flame gas cutting torch, and the lubricating oil penetrated into the inside wall of the cylinder is treated to ensure subsequent repair.

[0040] The heating of the inside of the cylinder by the neutral flame gas cutting torch is controlled as follows: the first flame scanning stay time cannot exceed 1.5S, and the cooling interval time is 35S; the second flame scanning stay time cannot exceed 1S, and the cooling interval time is 20S; the third and subsequent scanning stay time cannot exceed 0.5S, and the cooling interval time of each scanning is 10S; the total number of flame scanning is 8 times (the number of flame scanning is determined according to the use time of the cylinder and the penetration degree of the lubricating oil, until the lubricating oil in the damaged part of the inside wall of the cylinder is cleaned). The total requirement is to ensure that the temperature of the inside wall of the cylinder does not exceed 230℃, so as to ensure the yield stress of the cylinder after repair.

[0041] S207 Clean the damaged part of the inside wall of the cylinder with clean water, and dry it after cleaning.

[0042] S208 Apply AB glue evenly to the damaged part of the inside wall of the cylinder according to the use method, and ensure that the thickness of the AB glue is slightly higher than that of the undamaged part of the inside wall of the cylinder. The AB glue can be high-temperature resistant epoxy resin, such as AG-80, with a shear strength ≥18MPa and a long-term use temperature ≤180℃.

[0043] S209 After the AB glue is cured for 1h, perform the first rough polishing with 80-mesh sandpaper, and then perform the push-pull test with a piston without sealing parts to ensure that there is no jamming phenomenon.

[0044] S210 After the AB glue is cured for 2h, perform the second fine polishing with 600-mesh sandpaper, and ensure that the surface of the damaged part is flush with that of the undamaged part.

[0045] S211 After the AB glue is cured for 24 hours, it is soaked with pure water, and then polished for the third time with 2000-mesh sandpaper. The roughness after polishing is Ra 0.2-Ra 0.5 μm, and the roughness of the inner wall of the cylinder is Ra 0.4-Ra 0.6 μm, meeting the use requirements.

[0046] S212 After polishing, vaseline is applied to the inner wall surface of the cylinder barrel to form a protective film on the inner wall of the cylinder barrel.

[0047] S213 The disassembled cylinder parts are assembled after replacing the sealing elements.

[0048] Example 2 The main difference between this example and Example 1 is the polishing range and the flame scanning process. The detailed steps are as follows: S100 Preparation before maintenance: S101 Material preparation: according to the requirements of maintenance, prepare the corresponding specifications of sealing elements, vaseline, AB glue, 80-mesh sandpaper, 600-mesh sandpaper, 2000-mesh sandpaper, pure water, 1 bottle of oxygen, 1 bottle of acetylene, and other materials.

[0049] S102 Tool preparation: prepare the corresponding maintenance tools, such as wrench, screwdriver, rubber hammer, gas cutting gun, bench vice, cotton cloth, etc.

[0050] S200 Repair process: S201 Disassemble the cylinder, and place the piston rod (including the piston), front end cover, cylinder barrel, and rear end cover separately. Do not disassemble all the undamaged parts of the cylinder, and keep the integrity of each part.

[0051] S202 Wrap the cylinder barrel with wet cotton cloth and fix it with a bench vice. The force should be controlled to clamp the cylinder barrel without causing deformation of the cylinder barrel.

[0052] S203 Clean the inside of the cylinder barrel with cotton cloth and check the damage degree of the scratches on the inside of the cylinder barrel.

[0053] S204 Polish the damaged part of the inside of the cylinder barrel with 80-mesh sandpaper. The polishing range is 15 mm outward from the damage edge, and try to polish the oil film on the surface clean.

[0054] S205 Connect the oxygen and acetylene to the gas cutting gun and ignite it. Control the flame of the gas cutting gun to be neutral, and the flame core has a distinct outline (close to a cylindrical shape). The composition of the flame core is acetylene and oxygen, and the end is uniform and bright. The outer shell is composed of red-hot carbon particles. The temperature of the flame core reaches 1000°C. The reduction zone is outside the flame core, and the main difference from the flame core is that it is less bright.

[0055] S206 Because of the oil film attached to the inside of the cylinder, and as the cylinder usage time increases, a small amount of lubricating oil penetrates into the cylinder wall, the inner side of the cylinder is treated by using a neutral flame cutting torch to scan and heat the damaged and polished area, the lubricating oil that penetrates into the inner wall of the cylinder is treated to ensure subsequent repair.

[0056] The heating of the inner side of the cylinder by the neutral flame cutting torch is controlled as follows: the first flame scanning residence time cannot exceed 1.3S, the cooling interval time is 30S; the second flame scanning residence time cannot exceed 0.8S, the cooling interval time is 15S; the third flame scanning residence time cannot exceed 0.8S, the cooling interval time is 15S; the fourth and subsequent scanning residence time cannot exceed 0.5S, and the cooling interval time for each scanning is 11S; the total number of flame scanning is 7 times (the number of scanning using flame is determined according to the usage time of the cylinder and the penetration degree of lubricating oil, until the lubricating oil at the damaged area of the inner wall of the cylinder is cleaned). The total requirement is to ensure that the temperature of the inner wall of the cylinder does not exceed 230℃, so as to ensure the yield stress of the cylinder after repair.

[0057] S207 The damaged area of the inner wall of the cylinder is cleaned with clean water, and then dried.

[0058] S208 AB glue is uniformly applied to the damaged area of the inner wall of the cylinder according to the usage method, and the thickness of the AB glue is slightly higher than that of the undamaged area of the inner wall of the cylinder. The AB glue can be high-temperature resistant epoxy resin, such as AG-80, with a shear strength ≥18MPa and a long-term use temperature ≤180℃.

[0059] S209 After the AB glue is cured for 1h, the first rough polishing is performed with 80 mesh sandpaper, and then the push-pull experiment is performed with a piston without sealing parts to ensure that there is no jamming phenomenon.

[0060] S210 After the AB glue is cured for 3h, the second fine polishing is performed with 600 mesh sandpaper, and then the surface of the damaged area is ensured to be flush with that of the undamaged area.

[0061] S211 After the AB glue is cured for 24h, it is soaked with pure water, and then the third polishing is performed with 2000 mesh sandpaper, and the roughness after polishing reaches Ra0.2-Ra0.5μm, while the roughness of the inner wall of the cylinder is Ra0.4-Ra0.6μm, meeting the use requirements.

[0062] S212 After polishing, vaseline is applied to the surface of the inner wall of the cylinder to form a protective film.

[0063] Example 3 The difference in the wall thickness of the cylinder causes different heat conduction rates, and the different use time and environment of the cylinder causes different oil penetration thickness, and the fixed number of flame scanning, flame scanning time and cooling interval time easily causes local overheating or insufficient cleaning, and further causes insufficient sealing and durability of the cylinder after repair.

[0064] Based on this, the embodiment further includes a parameter self-adaptive step: Measuring the minimum wall thickness of the cylinder can determine the weakest point and avoid the risk of overheating, providing a basis for subsequent parameter setting.

[0065] Based on the cylinder model, minimum wall thickness and damage depth, the parameter reference table is queried to obtain the basic scanning time and cooling interval time, and the specific situation of the cylinder is combined to determine the preliminary scanning scheme.

[0066] According to the minimum wall thickness, the maximum single scanning time is calculated to adapt to the heat conduction difference of different wall thickness cylinders, avoid local overheating of the cylinder due to too long scanning time and too short interval time, and ensure the heating effect while protecting the cylinder.

[0067] During scanning, the scanning speed is dynamically adjusted according to the real-time temperature to realize accurate control of the heating process and improve the uniformity and efficiency of heating.

[0068] The parameter self-adaptive step solves the problem of local overheating or insufficient cleaning caused by fixed parameters, makes the repair process better adapt to the characteristics and damage of different cylinders, improves the maintenance quality and consistency, reduces the dependence on the experience of operators, and has important significance for cylinders with uneven wall thickness or complex damage.

[0069] The maximum single scanning time is obtained by subtracting the product of the minimum wall thickness and the difference between the reference wall thickness and the compensation coefficient from the reference time value, wherein the compensation coefficient is 0.5s / mm. Considering the influence of cylinder wall thickness on heat conduction, by setting the reference time value and the compensation coefficient, the maximum single scanning time can be accurately calculated according to the actual wall thickness difference of the cylinder. For cylinders with thin wall thickness, the scanning time and cooling interval time are correspondingly reduced to avoid overheating; for cylinders with thick wall thickness, the scanning time and cooling interval time are appropriately prolonged to ensure the heating effect. Quantifying the wall thickness factor makes different minimum wall thickness cylinders get adaptive maximum scanning time, improving the accuracy and applicability of the flame scanning step.

[0070] The single scan maximum duration and cooling interval time can be appropriately reduced in the first and second single scan duration and cooling interval time, and the second single scan duration and cooling interval time can be repeated multiple times to achieve the requirement of improving the local temperature of the cylinder wall. The fourth scan duration and cooling interval time remain unchanged, and the purpose is to force out the oil stains infiltrated in the cylinder wall to achieve the cleaning effect.

[0071] The cylinder maintenance method further comprises a parameter optimization step: recording the actual scan time, cooling interval time and scan times, and updating the parameter reference table when the effective data of the same type of cylinder reaches a certain number after verification by the air pressure sealing test.

[0072] During the maintenance process, key parameters such as actual scan time, cooling interval time and scan times are recorded to provide data support for subsequent parameter optimization. The maintenance effect is verified by air pressure sealing test to ensure the accuracy and effectiveness of the recorded parameters. When a certain number of effective data of the same type of cylinder is accumulated, the parameter reference table is updated to continuously improve the setting of maintenance parameters, making them more in line with actual maintenance needs and cylinder characteristics. The maintenance parameters are continuously optimized and improved, improving the adaptability and reliability of the maintenance method, which helps to improve the maintenance quality and efficiency and reduce the maintenance cost.

[0073] The detailed steps are as follows: S2061 measures the cylinder wall thickness δ: using a laser micrometer to measure the wall thickness δ of the middle and end of the cylinder to be repaired, taking the minimum value δ min By determining the thinnest wall thickness point, the risk of overheating is avoided.

[0074] S2062 retrieves historical process parameters: according to the cylinder model, δ min , damage depth d, query the pre-stored parameter reference table to obtain the basic scan times N base , which can be appropriately increased or decreased according to the different oil stain penetration thickness caused by different cylinder use time and environment.

[0075] Table 1 Parameter Reference Table:

[0076] S2063 installs an infrared temperature measurement module: a high-temperature-resistant infrared temperature measurement probe is installed on the side of the flame core of the gas cutting gun, the working temperature is > 1000℃, the probe axis forms a 30° angle with the flame core, and the cylinder heating point temperature T is monitored in real time.

[0077] S2064 calculates the single maximum scan time t max : t max =T0-(δ min -K0)×K1; wherein, δ min : measured minimum wall thickness; T0: reference scan time, taken as 1.5 s; K0: reference wall thickness, taken as 1.0 mm; K1: wall thickness compensation coefficient, taken as 0.5 s / mm. For example: when δ min = 1.2 mm, t max = 1.5 - (1.2 - 1.0) x 0.5 = 1.4 s.

[0078] S2065 performs adaptive flame scanning: scans according to the N base value obtained in S2062, but the single scan time is dynamically adjusted according to the following rules: If T < 200℃, the scanning speed is reduced to 0.8 times the standard speed, and the heating time is extended; if 200℃ ≤ T ≤ 220℃, the standard scanning speed is maintained; if T > 220℃, the speed is immediately accelerated to 1.5 times the standard speed and a buzzer alarm is triggered; the termination condition is: completing N base scans or no oil stains are precipitated in the damaged area of the cylinder.

[0079] S2066 records the actual process parameters: stores the δ min , d, actual scan times N actual , and maximum temperature T max of this maintenance.

[0080] S2067 verifies the repair quality: performs a gas pressure sealing test, and if it is qualified, marks the set of parameters as valid data.

[0081] S2068 updates the parameter reference table: if there are ≥ 5 sets of valid data accumulated for the same type of cylinder, then recalculates N min according to the δ base and d intervals.

[0082] The above describes the specific embodiments of the present application, but is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the scope of protection of the present application.

Claims

1. A method for repairing the cylinder barrel of a thin-walled aluminum cylinder, characterized in that, include: Secure the cylinder and clean the damaged areas on the inner wall of the cylinder. Polish the damaged area of ​​the cylinder barrel; The polishing area is subjected to multiple rounds of flame scanning, and the time for a single scan decreases as the number of scans increases; Clean and dry the heating area; Apply a filler to the damaged area and allow it to cure; Perform three polishing processes in sequence: After the first curing, polish with coarse sandpaper until the piston can be pushed and pulled without jamming; after the second curing, polish with fine sandpaper until it is flush with the undamaged area; after the third curing, polish with water-wet polishing sandpaper until the set roughness range is reached.

2. The method for repairing aluminum thin-walled cylinder barrels as described in claim 1, characterized in that, The cylinder grinding area is flame-scanned using an oxy-fuel cutting torch, and the flame of the oxy-fuel cutting torch is controlled to be a neutral flame.

3. The method for repairing aluminum thin-walled cylinder barrels as described in claim 1, characterized in that, The duration of a single flame scan meets the following requirements: the duration of the first scan is greater than the duration of the second scan is greater than the duration of subsequent scans, and the duration of the first scan does not exceed 1.5 seconds, with a cooling interval of 35 seconds.

4. The method for repairing aluminum thin-walled cylinder barrels as described in claim 3, characterized in that, The duration of the second scan is no more than 1 second, with a cooling interval of 20 seconds; the duration of subsequent scans is no more than 0.5 seconds, with a cooling interval of 10 seconds for each scan; a total of 8 flame scans are performed.

5. The method for repairing aluminum thin-walled cylinder barrels as described in claim 3, characterized in that, The filler used is AB glue, and the thickness of the coating is higher than the undamaged area of ​​the cylinder inner wall.

6. The method for repairing aluminum thin-walled cylinder barrels as described in claim 1, characterized in that, The curing process of the filler includes: the first sanding is performed with 80-grit sandpaper 1 hour after curing, the second sanding is performed with 600-grit sandpaper 2 hours after curing, and the third sanding is performed with pure water and then with 2000-grit sandpaper 24 hours after curing.

7. The method for repairing aluminum thin-walled cylinder barrels as described in claim 1, characterized in that, After polishing, apply petroleum jelly to the inside of the cylinder barrel, which will form a protective film on the inner wall of the cylinder barrel.

8. The method for repairing aluminum thin-walled cylinder barrels as described in claim 1, characterized in that, It also includes a parameter adaptation step: Measure the minimum wall thickness of the cylinder barrel; The basic number of scans is obtained by referring to a parameter comparison table based on cylinder model, minimum wall thickness, and damage depth. Calculate the maximum duration of a single scan based on the minimum wall thickness; The scanning speed is dynamically adjusted based on the real-time temperature during the scanning process.

9. The method for repairing aluminum thin-walled cylinder barrels as described in claim 8, characterized in that, The maximum duration of a single scan is obtained by subtracting the product of the difference between the minimum wall thickness and the reference wall thickness and the compensation coefficient from the reference time value, wherein the compensation coefficient is 0.5s / mm.

10. The method for repairing aluminum thin-walled cylinder barrels as described in claim 8, characterized in that, It also includes parameter optimization steps: recording the actual number of scans and the highest temperature, and updating the parameter comparison table when the effective data of the same model cylinder reaches the set number after verification by air pressure sealing test.

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