Automatic nickel brushing process for aero-engine combustion chamber casing

Abstract

The invention discloses an automatic nickel plating process for an aero-engine casing. Comprising the following steps: cleaning the surface of a workpiece, protecting a non-brazed surface, performing sand blasting operation on a brazed surface, clamping the workpiece on a brush plating table board, performing brush plating program programming operation by a manipulator, performing brush plating test operation, performing brush plating of a special nickel solution, cleaning the surface of the workpiece, performing brush plating of a rapid nickel solution, cleaning the surface of the workpiece, flushing the surface of the workpiece, and checking the surface of the workpiece. The brush plating process of the brush plating electrode is controlled through a program, automatic brush nickel plating operation is achieved, and the technical problems of uneven nickel layer deposition thickness and poor quality stability existing in manual brush nickel plating of the combustion chamber casing are solved; and meanwhile, through the implementation of the technical scheme of automatic nickel brushing of the combustion chamber case, the working environment of operators is improved, and a powerful guarantee is provided for occupational health.

Description

Technical Field

[0001] The present invention relates to the field of nickel plating, and more specifically, to an automatic nickel brushing process for an aero-engine combustion chamber casing. Background Art

[0002] A certain type of aero-engine combustion chamber casing is formed by vacuum brazing a housing and more than a dozen mounting seats. There are more than a dozen bosses on the housing corresponding to the mounting seats one by one. The housing material is GH4169. This material has relatively high Al and Ti contents, and the wettability of the filler metal on its surface is poor, which affects the flow of the filler metal during the vacuum brazing process of the part and the subsequent gap filling of the brazing seam. In addition, all brazing seams of this part are Class II welds. According to relevant acceptance requirements, the welding joint rate is required to reach more than 75%, and no through defects are allowed. To ensure good brazing quality, a pretreatment method for surface modification of the material needs to be adopted to improve the wettability of the filler metal and enhance the brazing quality.

[0003] Considering that the housing is relatively large in size, but the brazing surface is only the boss parts for vacuum brazing with more than a dozen mounting seats, in order to avoid the risk of local nickel layer peeling off on the non-brazing surface after the whole part is nickel plated, the housing is processed by brushing nickel on the ends of more than a dozen bosses. However, conventional manual nickel brushing has high requirements for the operator's skill level, and the uniformity and stability of the nickel layer deposition thickness during the nickel brushing process cannot be fully quantified and controlled, and the stability of the brushing quality is difficult to guarantee. Moreover, the existing non-destructive testing methods cannot monitor and detect its quality, which ultimately leads to manual nickel brushing becoming a risk point for the quality of the combustion chamber casing vacuum brazing. To sum up, in the present invention, since the part housing is a conical surface with a non-uniform cross-section, the pressure uniformity at both ends of the conical surface is the key to ensuring the nickel plating quality, but it is difficult to control the pressure uniformity at both ends. And there are more than a dozen bosses with up to 8 different sizes and various shapes, and the uniformity of nickel plating at the bosses is a major challenge.

[0004] The invention patent CN113529146B discloses a brush plating nickel process for an aero-engine diffuser, which includes the following steps: cleaning, cleaning the diffuser so that the surface of the diffuser has no oil stains and no foreign objects; protection, protecting the non-brazing surface of the diffuser; sandblasting, sandblasting and roughening the surface to be brazed until the surface to be brazed is uniformly grayish-white, and then cleaning the surface of the surface to be brazed; brush plating special nickel, using a plating pen to brush plate special nickel; brush plating fast nickel, using a plating pen to brush plate fast nickel; cleaning, cleaning the diffuser body and the outer cover after nickel plating until the nickel layer is exposed. This invention uses manual operation during the brush plating nickel operation, and manual operation cannot accurately control the deposition thickness and uniformity of the nickel layer; and due to the large difference in shape between the casing of the engine casing and the diffuser in this invention, the brush plating surface of the casing has a taper, and it is easy to tilt when the plating pen contacts the casing during manual operation, resulting in uneven stress during brush plating. Therefore, this prior art cannot be applied to the brush plating operation of the aero-engine combustion chamber casing, and the uniformity requirement for the boss cannot be achieved either. Summary of the Invention

[0005] To solve the problem that the deposition thickness and uniformity of the nickel layer cannot be accurately controlled in the above-mentioned manual brush plating nickel, the present invention provides an automatic brush plating nickel process for an aero-engine combustion chamber casing.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] An automatic brush plating nickel process for an aero-engine combustion chamber casing, the combustion chamber casing includes a casing body, the casing body is in a conical cylinder shape, and a plurality of bosses are distributed on the surface of the casing body. The bosses are brazing surfaces, and the process includes the following steps:

[0008] S1. Cleaning: Clean the oil stains and foreign objects on the surface of the casing body;

[0009] S2. Protection and zoning: Protect the non-brazing surface of the casing, group the bosses of the casing mounting seat, the number of groups is less than the number of bosses of the mounting seat, stick tape on the bosses of each group, and only expose the parts to be brush plated with nickel;

[0010] S3. Sandblasting: Sandblast and roughen the brazing surface, and after sandblasting, the surface is uniformly grayish-white and there is no sand particle residue;

[0011] S4. Clamping: Fix the aero-engine combustion chamber casing on the brush plating table;

[0012] S5. Programming the manipulator brush plating procedure: Take the part as a tapered ring part, determine the width of the brush plating surface as the maximum spacing in the height direction of all part seat numbers; according to the width of the brazing surface of the aero-engine combustion chamber casing, design the brush plating electrode structure of a cuboid, the dimension in the length direction of the electrode is designed to be slightly larger than the maximum spacing in the height direction of all part seat numbers, and program the brush plating trajectory, set the brush plating speed, voltage, pressure, dipping liquid cycle and brush plating time;

[0013] S6. Trial brush plating: Simulate the operation of the brush plating process;

[0014] S7. Brush plating with special nickel solution: Adjust the angle of the brush plating table so that the surface to be brush plated on the casing is horizontal. The manipulator grabs the brush plating electrode, and the brush plating table rotates in cooperation. The brush plating electrode conducts nickel brush plating in a full circle on the part. Control the thickness of the nickel layer through the brush plating speed and brush plating time. The brush plating speed is 45 - 75 mm / s, the voltage is 10 - 14 V, the dipping liquid cycle is 20 - 30 s, the time is 6 - 8 min, and the brush plating pressure is 4 - 6 N;

[0015] S8. Cleaning: The manipulator grabs the water gun and, with the brush plating table rotating, rinses the special nickel solution on the entire brush plating surface of the casing clean;

[0016] S9. Brush plating with fast nickel solution: The surface to be brush plated on the casing remains horizontal. The manipulator grabs the brush plating electrode, and the brush plating table rotates in cooperation. The brush plating electrode conducts nickel brush plating in a full circle on the part. Control the thickness of the nickel layer through the brush plating speed and brush plating time. The brush plating speed is 45 - 75 mm / s, the voltage is 10 - 14 V, the dipping liquid cycle is 20 - 30 s, the time is 19 - 21 min, and the brush plating pressure is 4 - 6 N;

[0017] S10. Cleaning: The manipulator grabs the water gun and, with the brush plating table rotating, rinses the fast nickel solution on the entire brush plating surface of the casing clean;

[0018] S11. Rinsing: Remove the combustion chamber casing from the brush plating table and rinse it repeatedly with hot water until all the residual nickel solution on the part is completely removed;

[0019] S12. Inspection: Visually inspect the appearance and adhesion of the nickel layer.

[0020] Further, the process of programming the brush plating in step S5 includes:

[0021] S501: Select the initial point and adjust the distance between the brush head and the part;

[0022] S502: Plan the brush plating trajectory, use the "scirc" command to select the auxiliary point and the end point;

[0023] S503: Use the control system to set the brush plating speed, brush plating voltage, pressure, dipping liquid cycle, and brush plating time when the manipulator uses special nickel solution and fast nickel solution;

[0024] S504: After completing the program compilation, select the corresponding program number and activate the automatic nickel brush plating function.

[0025] Further, the upper part of the brush plating electrode is connected to the manipulator, and the outer surface is wrapped with a nickel envelope head cloth for liquid absorption.

[0026] Further, the appearance of the nickel layer in step S12 is a light yellowish silver-white nickel layer.

[0027] Further, in step S9, the deposition thickness of the nickel layer is 8 - 12 um.

[0028] Further, in step S2, the large end of the casing is placed downward on the electroplating table, and after determining the position through the angular holes on the casing, the casing is fixed using a three-jaw chuck.

[0029] Further, in step S3, the abrasive material is corundum sand with a mesh size of 200 - 240, the compressed air pressure is 0.2 MPa - 0.35 MPa, the sandblasting distance is 40 mm - 150 mm, and the sandblasting angle is 40° - 80°.

[0030] Further, in step S1, the combustion chamber casing is cleaned with anhydrous ethanol or an ultrasonic cleaning line.

[0031] A system for an automatic nickel electroplating process of an aeroengine combustion chamber casing, comprising:

[0032] An electroplating table, which is arranged in a closed electroplating chamber, is electrically connected to a control system, and is provided with a fixing device and a rotating device for fixing the casing and driving the casing to rotate;

[0033] An electroplating workbench, which is arranged in the closed electroplating chamber and is adjacent to the electroplating table. Multiple tanks are arranged on the electroplating workbench, and a rapid nickel solution and a special nickel solution are contained in the tanks;

[0034] A manipulator, which is connected to the control system and is arranged on one side of the electroplating table. The manipulator is used for clamping an electroplating electrode to perform electroplating operations;

[0035] An electroplating power supply, which is connected to the control system. The negative pole of the power supply is connected to the electroplating table to form a cathode, and the positive pole of the electroplating power supply is connected to the electroplating electrode to form an anode;

[0036] A control system, which is provided with program control for the electroplating speed, voltage, pressure, dipping cycle, and electroplating time of the manipulator;

[0037] A closed electroplating chamber, on the floor of which a waste liquid collection tank is arranged, and an exhaust system is arranged in the closed chamber. The exhaust system collects the waste gas generated during electroplating operations.

[0038] Further, the exhaust system is connected to an external waste gas treatment system.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] The present invention solves the problems of difficult control of the uniformity and thickness of local nickel plating on a rotary body part through an automated brush plating process, by selecting a cuboid electrode and under the pressure control of the present invention.

[0041] Through the implementation of the automatic nickel brush plating process method of the present invention, the brush plating path, brush plating pressure, and brush plating time of the brush plating electrode are programmed and controlled, realizing automated nickel brush plating operation, achieving surface modification of the GH4169 material of the casing shell, solving the technical problems of the uniformity of the nickel layer deposition thickness and the quality stability existing in the manual nickel brush plating of the combustion chamber casing, and making the appearance and ultrasonic testing of the part weld meet the requirements, with a welding rate of 100%.

[0042] Meanwhile, through the implementation of the automatic nickel brush plating technical solution for the combustion chamber casing, the working environment of the operators is improved, providing a strong guarantee for occupational health. Description of the Drawings

[0043] Figure 1 is a schematic structural diagram of the combustion chamber casing;

[0044] Figure 2 is a schematic structural diagram of the casing shell;

[0045] [[ID= nineteen]] Figure 3 is a process flow diagram of an automatic nickel brush plating process for an aero-engine combustion chamber casing;

[0046] Figure 4 is a schematic diagram of the working state of automatic nickel brush plating;

[0047] Figure 5 is a schematic diagram of the external structure of the enclosed room;

[0048] Figure 6 is a schematic diagram of the internal structure of the enclosed room;

[0049] Among them: 1. Casing shell; 2. Mounting seat; 3. Boss; 4. Enclosed brush plating room; 5. Exhaust system; 6. Brush plating power supply; 7. Brush plating table; 8. Manipulator; 9. Waste liquid collection tank; 10. Brush plating workbench; 11. Control system. Detailed Embodiments

[0050] The following further explains and clarifies in conjunction with the embodiments, but the specific embodiments do not impose any form of limitation on the present invention. Unless otherwise specified, the methods and equipment used in the embodiments are conventional methods and accessory integrations in the art, and the raw materials used are all conventional commercially available raw materials.

[0051] Embodiment 1

[0052] Such as Figure 1 And Figure 2As shown in the figure, the present embodiment is applied to an aero-engine combustion chamber casing. The combustion chamber casing includes a casing shell 1, the casing shell 1 is in a conical cylinder shape, and a plurality of bosses 3 are distributed on the surface of the casing shell 1. The bosses 3 are brazing surfaces, and mounting seats 2 are brazed on the brazing surfaces. To ensure the brazing quality, it is necessary to perform nickel brush plating on the brazing surfaces.

[0053] As Figure 3 and Figure 4 , the present embodiment provides an automatic nickel brush plating process for an aero-engine combustion chamber casing, and the process steps are as follows:

[0054] S1. Cleaning: Clean the oil stains and foreign matters on the surface of the shell with anhydrous ethanol to prevent foreign matters from being embedded in the part substrate after sandblasting.

[0055] S2. Protection: Protect the non-brazing surfaces (non-nickel brush plating parts) on the shell with protective tape to avoid damaging the surface states of other non-nickel brush plating surfaces. Considering the taping efficiency and the part structure, the adjacent mounting seats on the shell are divided into a group, which is called a seat number. In this embodiment, there are 17 bosses, and they are divided into more than 14 seat numbers. The area outside the seat numbers is protected with protective tape as a whole, and the seat number positions are exposed.

[0056] S3. Sandblasting: Dry blast 200-mesh corundum sand on 14 seat numbers on the shell respectively. The compressed air pressure is 0.2 MPa, the sandblasting distance is 40, and the sandblasting angle is 40°. During sandblasting, the sandblasting distance, sandblasting angle and moving speed are kept constant. After sandblasting, clean the residual sand grains on the part surface with compressed air, and check that the sandblasted area needs to be grayish-white and uniform, and there should be no reflected metal bright spots when checking against the light.

[0057] S4. Clamping: Place the shell with the large end facing down (on the side of the angular hole) on the brush plating table, and use the angular hole to determine the position through a limit pin, and then fix the part with a three-jaw chuck.

[0058] S5. Programming the robotic brush plating procedure: According to the brazing surface width of the combustion chamber casing, design the length dimension of the brush plating electrode. The electrode length dimension is slightly larger than the maximum spacing in the height direction of all part seat numbers, and program the brush plating trajectory, and set the brush plating speed, voltage, pressure, dipping cycle and brush plating time; considering that the casing shell 1 is in a conical cylinder shape, adjust the surface to be brush plated of the casing shell 1 to a horizontal state, so that the lower end surface of the brush plating electrode is in full contact with the surface to be brush plated, avoiding uneven brush plating caused by uneven force. Then, according to the tapered surface, set the brush plating trajectory. The brush plating trajectory is set along the path of the tapered surface. During the brush plating process, the lower end surface of the brush plating electrode is always in full contact with the tapered surface, and the brush plating electrode is larger than the brush plating surface width.

[0059] Among them, the specific process of programming the brush plating procedure in S5 is as follows:

[0060] S501: Select the initial point and adjust the distance between the electroplating electrode and the part.

[0061] S502: Plan the electroplating trajectory, use the "scirc" command to select the auxiliary point and the end point.

[0062] S503: Use the control system to set the electroplating speed, voltage, pressure, dipping cycle and electroplating time for the special nickel solution and the fast nickel solution of the manipulator.

[0063] S504: After completing the program compilation, select the corresponding program number and start the automatic nickel electroplating function.

[0064] S6. Trial electroplating: Run the electroplating program in the non-powered mode, promptly correct the improper programs and parameters, and start the program to perform the automatic nickel electroplating process for the part after confirming that the program is correct.

[0065] S7. Electroplate the special nickel solution: Connect the electroplating tabletop to the negative pole of the electroplating power supply to form the cathode, and connect the electroplating electrode to the positive pole of the electroplating power supply to form the anode. The electroplating electrode is of a cuboid structure, with the upper part connected to the manipulator, and the outer surface is wrapped with a nickel-coated head cloth for liquid absorption. Adjust the angle of the electroplating tabletop to make the surface to be electroplated of the casing horizontally. The manipulator grabs the electroplating electrode, and the electroplating tabletop rotates in cooperation. The electroplating electrode electroplates nickel in a full circle on the part, and controls the nickel layer thickness through the electroplating speed and electroplating time. Among them, the nickel electroplating parameters are set as follows: electroplating speed 45 mm / s, voltage 10 V, pressure 4 N, dipping cycle x s, time 6 min. Through full-circle nickel electroplating, the uniformity and thickness control of the nickel plating on the convex platform on the surface of the rotary parts such as the casing are better.

[0066] S8. Cleaning: The manipulator grabs the water gun and rinses the special nickel solution on the entire electroplated surface of the casing in a full circle while the electroplating tabletop is rotating.

[0067] S9. Electroplate the fast nickel solution: The surface to be electroplated of the casing remains in a horizontal state. The manipulator grabs the electroplating electrode, and the electroplating tabletop rotates in cooperation. The electroplating electrode electroplates nickel in a full circle on the part, and controls the nickel layer thickness through the electroplating speed and electroplating time. Among them, the nickel electroplating parameters are set as follows: electroplating speed 45 mm / s, voltage 10 V, pressure 4 N, dipping cycle 20 s, time 19 min.

[0068] S10. Cleaning: The manipulator grabs the water gun and rinses the fast nickel solution on the entire electroplated surface of the casing in a full circle while the electroplating tabletop is rotating.

[0069] S11. Rinsing: Remove the combustion chamber casing from the electroplating tabletop and rinse it repeatedly with hot water until all the residual nickel solution on the part is completely removed, revealing a slightly yellowish silver-white nickel layer.

[0070] Note: There was a missing value in the "dipping cycle" in the original text of S7, which was filled with "x" in the translation for the sake of integrity. You can replace it with the correct value according to the actual situation.S12. Inspection: Visually inspect the appearance and adhesion of the nickel layer.

[0071] For the combustion chamber casing processed by the process of this embodiment, the appearance of the part weld seam and ultrasonic inspection meet the requirements, and mass production can be carried out.

[0072] Embodiment 2

[0073] As Figure 3 and Figure 4 , this embodiment provides an automatic brush plating nickel process for an aeroengine combustion chamber casing, and the process steps are as follows:

[0074] S1. Cleaning: Use an ultrasonic cleaning line to clean the oil stains and foreign matters on the surface of the casing to prevent foreign matters from being embedded in the part base material after sandblasting.

[0075] S2. Protection: Use protective tape to protect the non-brazing surface (non-brush plating nickel part) on the casing to avoid damaging the surface state of other non-brush plating nickel surfaces. Considering the taping efficiency and part structure, the adjacent mounting seats on the casing are divided into a group, which is called a seat number. The 17 bosses are divided into 14 seat numbers in total. The area except the 14 seat numbers is protected with protective tape as a whole.

[0076] S3. Sandblasting: Dry blast 240-mesh corundum sand on the 14 seat numbers on the casing respectively. The compressed air pressure is 0.35 MPa, the sandblasting distance is 150 mm, and the sandblasting angle is 80°. During sandblasting, the sandblasting distance, sandblasting angle and moving speed are kept constant. After sandblasting, use compressed air to clean the residual sand grains on the part surface. It is necessary to check that the sandblasted area is grayish-white and uniform, and there should be no reflective metal bright spots when checking against the light.

[0077] S4. Clamping: Place the casing with the large end facing down (on the side of the angular hole) on the brush plating table, and use the angular hole to determine the position through the limit pin and then fix the part with a three-jaw chuck.

[0078] S5. Programming of the manipulator brush plating procedure: According to the brazing surface width of the combustion chamber casing, design the length dimension of the brush plating electrode. The electrode length dimension is slightly larger than the maximum spacing in the height direction of all part seat numbers, and program the brush plating trajectory, and set the brush plating speed, voltage, pressure, dipping cycle and brush plating time; among them, the process of programming the brush plating procedure in S5 is as follows:

[0079] S501: Select the initial point and adjust the distance between the brush plating electrode and the part;

[0080] S502: Plan the brush plating trajectory, and use the "scirc" command to select the auxiliary point and the end point;

[0081] S503: Use the control system to set the brush plating speed, voltage, pressure, dipping cycle and brush plating time when the manipulator uses special nickel solution and rapid nickel solution;

[0082] S504: After completing the programming, select the corresponding program number and start the automatic nickel electroplating function.

[0083] S6. Trial nickel electroplating: Run the nickel electroplating program in the non-powered mode, promptly correct improper programs and parameters. After confirming that the program is correct, start the program to perform the automatic nickel electroplating process on the parts.

[0084] S7. Electroplate with special nickel solution: Connect the electroplating tabletop to the negative electrode of the electroplating power supply to form a cathode, and connect the electroplating electrode to the positive electrode of the electroplating power supply to form an anode. The electroplating electrode is of a cuboid structure, with the upper part connected to the manipulator, and the outer surface is wrapped with a nickel-covered head cloth for liquid absorption. Adjust the angle of the electroplating tabletop to make the surface to be electroplated of the casing horizontal. The manipulator grabs the electroplating electrode, and the electroplating tabletop rotates accordingly. The electroplating electrode performs nickel electroplating in a full circle on the part, and the thickness of the nickel layer is controlled by the electroplating speed and electroplating time. The nickel electroplating parameters are set as follows: electroplating speed 75 mm / s, voltage 14 V, pressure 6 N, dipping liquid cycle 30 s, time 8 min.

[0085] S8. Cleaning: The manipulator grabs the water gun and, with the electroplating tabletop rotating, rinses the special nickel solution on the entire electroplated surface of the casing clean.

[0086] S9. Electroplate with fast nickel solution: The surface to be electroplated of the casing remains horizontal. The manipulator grabs the electroplating electrode, and the electroplating tabletop rotates accordingly. The electroplating electrode performs nickel electroplating in a full circle on the part, and the thickness of the nickel layer is controlled by the electroplating speed and electroplating time. The nickel electroplating parameters are set as follows: electroplating speed 75 mm / s, voltage 14 V, pressure 6 N, dipping liquid cycle 30 s, time 21 min.

[0087] S10. Cleaning: The manipulator grabs the water gun and, with the electroplating tabletop rotating, rinses the fast nickel solution on the entire electroplated surface of the casing clean.

[0088] S11. Rinsing: Remove the combustion chamber casing from the electroplating tabletop and rinse it repeatedly with hot water until all the residual nickel solution on the part is completely removed, exposing a slightly yellowish silver-white nickel layer.

[0089] S12. Inspection: Visually inspect the appearance and adhesion of the nickel layer.

[0090] For the combustion chamber casing processed by the process of this embodiment, the appearance of the part weld and ultrasonic inspection meet the requirements, and mass production can be carried out.

[0091] Embodiment 3

[0092] As Figure 3 and Figure 4 , this embodiment provides an automatic nickel electroplating process for an aeroengine combustion chamber casing. The process steps are as follows:

[0093] S1. Cleaning: Use an ultrasonic cleaning line to clean the oil stains and foreign matters on the surface of the housing to prevent foreign matters from embedding into the part substrate after sandblasting.

[0094] S2. Protection: Use protective tape to protect the non-brazing surfaces (non-electroless nickel plating areas) on the housing to avoid damaging the surface states of other non-electroless nickel plating surfaces. Considering the taping efficiency and part structure, divide the adjacent mounting seats on the housing into a group, which is called a seat number. A total of 17 bosses are divided into 14 seat numbers, and the areas other than the 14 seat numbers are protected with protective tape as a whole.

[0095] S3. Sandblasting: Dry blast 220-mesh corundum sand on the 14 seat numbers on the housing respectively. The compressed air pressure is 0.3 MPa, the sandblasting distance is 100 mm, and the sandblasting angle is 60°. During sandblasting, the sandblasting distance, sandblasting angle and moving speed are kept constant. After sandblasting, use compressed air to clean the residual sand grains on the part surface. Check that the sandblasted area needs to be evenly grayish-white, and there should be no reflective metal bright spots when checking against light.

[0096] S4. Clamping: Place the housing with the large end facing down (on the side of the angular hole) on the electroplating table, and use the angular hole to determine the position through the limit pin, and then fix the part with a three-jaw chuck.

[0097] S5. Programming the robotic electroplating procedure: According to the brazing surface width of the combustion chamber casing, design the length dimension of the electroplating electrode. The electrode length dimension is slightly larger than the maximum spacing in the height direction of all part seat numbers, and program the electroplating trajectory, and set the electroplating speed, voltage, pressure, dipping cycle and electroplating time; among them, the electroplating procedure programming process in S5 is as follows:

[0098] S501: Select the initial point and adjust the distance between the electroplating electrode and the part.

[0099] S502: Plan the electroplating trajectory, use the "scirc" command to select the auxiliary point and the end point.

[0100] S503: Use the control system to set the electroplating speed, voltage, pressure, dipping cycle and electroplating time when the robotic arm uses special nickel solution and fast nickel solution.

[0101] S504: After completing the program compilation, select the corresponding program number and start the automatic electroplating nickel function.

[0102] S6. Trial electroplating: Run the electroplating program in the non-powered mode, promptly correct the improper programs and parameters, and start the program to perform the automatic electroplating nickel process on the part after confirming that the program is correct.

[0103] S7. Brush plating special nickel solution: Connect the brush plating table to the negative electrode of the brush plating power supply to form a cathode, and connect the brush plating electrode to the positive electrode of the brush plating power supply to form an anode. The brush plating electrode is of a cuboid structure, and the electrode length dimension is slightly larger than the maximum distance in the height direction of all part seat numbers. The upper part is connected to the manipulator, and the outer surface is wrapped with a nickel-coated head cloth for liquid absorption. Adjust the angle of the brush plating table to make the surface to be brush plated of the casing horizontal. The manipulator grabs the brush plating electrode, and the brush plating table rotates in cooperation. The brush plating electrode performs nickel plating in a full circle on the part, and the nickel layer thickness is controlled by the brush plating speed and time. Among them, the brush plating nickel parameters are set as follows: brush plating speed 65 mm / s, voltage 12 V, pressure 5 N, dipping liquid cycle 25 s, time 7 min. In this embodiment, the brush plating electrode is a pure nickel electrode. After testing, the surface of the pure nickel electrode is silver-white after nickel plating, with better effects and more stable quality. In other embodiments, a stainless steel electrode is used. The conductivity of this electrode is not as good as that of the pure nickel electrode, and the amount of electricity acting on the part surface is smaller, resulting in a slower nickel layer deposition rate than that of the pure nickel electrode, lower coating efficiency, and the nickel layer surface is prone to blackening due to the increase in the brush plating nickel time, and the nickel layer quality does not meet the acceptance requirements. Pressure control is crucial for the uniformity of nickel plating on the convex surface. Since the casing is a conical surface, the convex platforms are arranged on the conical surface and have different shapes and sizes. After a large number of tests, it is proved that pressure control has a greater impact on the uniformity of the convex surface. The process purpose can be achieved when the pressure is 4 - 6 N, and the efficiency is the highest at 5 N.

[0104] S8. Cleaning: The manipulator grabs the water gun and rinses the special nickel solution on the entire brush plating surface of the casing in a full circle while the brush plating table is rotating.

[0105] S9. Brush plating fast nickel solution: The surface to be brush plated of the casing remains horizontal. The manipulator grabs the brush plating electrode, and the brush plating table rotates in cooperation. The brush plating electrode performs nickel plating in a full circle on the part, and the nickel layer thickness is controlled by the brush plating speed and time. Among them, the brush plating nickel parameters are set as follows: brush plating speed 65 mm / s, voltage 12 V, pressure 5 N, dipping liquid cycle 25 s, time 20 min.

[0106] S10. Cleaning: The manipulator grabs the water gun and rinses the fast nickel solution on the entire brush plating surface of the casing in a full circle while the brush plating table is rotating.

[0107] S11. Rinsing: Remove the combustion chamber casing from the brush plating table and rinse it repeatedly with hot water until all the residual nickel solution on the part is completely removed, revealing a slightly yellowish silver-white nickel layer.

[0108] S12. Inspection: Visually inspect the appearance and adhesion of the nickel layer.

[0109] For the combustion chamber casing processed by the process of this embodiment, the appearance of the part weld and the ultrasonic inspection meet the requirements, and the welding rate reaches 100%.

[0110] Example 4

[0111] As Figures 1 to 6 shown, this embodiment provides a system for an automatic nickel brush plating process for an aeroengine combustion chamber casing, including:

[0112] A closed brush plating room 4, with a waste liquid collection tank arranged on the ground of the closed brush plating room 4, and an exhaust system 5 arranged in the closed room, and the exhaust system 5 collects the exhaust gas generated during the brush plating operation;

[0113] A brush plating table 7, which is arranged in the closed brush plating room 4, is electrically connected to the control system 11, and is provided with a fixing device and a rotating device for fixing the casing and driving the casing to rotate;

[0114] A brush plating workbench 10, which is arranged in the closed brush plating room 4 and is adjacent to the brush plating table 7. A plurality of tanks are arranged on the brush plating workbench 10, and a rapid nickel solution and a special nickel solution are contained in the tanks;

[0115] A manipulator 8, which is connected to the control system 11 and is arranged on one side of the brush plating table 7. The manipulator 8 is used for clamping a brush plating electrode to perform a brush plating operation;

[0116] A brush plating power supply 6, which is connected to the control system 11. The negative pole of the power supply is connected to the brush plating table to form a cathode, and the positive pole of the brush plating power supply is connected to the brush plating electrode to form an anode;

[0117] A control system 11, which is provided with a program to control the brush plating speed, voltage, pressure, dipping cycle and brush plating time of the manipulator 8;

[0118] First, place the large end of the casing shell after the S3 sandblasting operation downward on the electroplating table 7. After determining the position through the angular holes on the casing shell, fix the casing shell using a three-jaw chuck. Using the angular holes for positioning can conveniently ensure that the placement position of the casing during each electroplating is consistent. At the same time, adjust the angle of the electroplating table 7 to make the surface to be electroplated on the casing shell in a horizontal state to prevent uneven electroplating pressure caused by the inclination of the surface to be electroplated. After the fixing operation is completed, the operator operates the control system 11 to select the set program to electroplate the casing shell. The manipulator 8 receives the instruction from the control system 11, grabs the electroplating electrode to perform electroplating. First, dip it into the special nickel solution in the tank of the electroplating workbench 10, and perform electroplating according to the path, pressure, electroplating speed, and electroplating time set by the program. After completing the special nickel solution, the program controls the manipulator 8 to grab the water gun and, with the electroplating table 10 rotating, rinse the special nickel solution on the entire electroplating surface of the shell clean. Then, perform the electroplating of the fast nickel solution operation, and after the operation is completed, perform the water gun rinsing again. By setting the electroplating table 7, the electroplating workbench 10, and the manipulator 8 in the closed electroplating room, and setting the electroplating power supply 6 and the control system 11 outside the closed electroplating room, isolating the working room from the control system, the operator can perform program control outside the closed room 4, improving the working environment of the operator and reducing the occupational disease hazards.

[0119] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An automatic nickel electroplating process for an aeroengine casing. The casing includes a casing shell which is in a conical cylinder shape, and a plurality of bosses are distributed on the surface of the casing shell. The bosses are brazing surfaces, and it is characterized in that It includes the following steps: S1. Cleaning: Clean the oil stains and foreign matters on the surface of the casing shell; S2. Protection and zoning: Protect the non-brazing surface of the casing, group the boss of the housing mount, the number of groups is less than the number of bosses of the housing mount, stick tape on the bosses of each group, and only expose the nickel plating parts; S3. Blasting: Blast and roughen the brazing surface. After blasting, the surface is grayish white and uniform, without sand grains remaining; S4. Clamping: Fix the combustion chamber casing on the electroplating table; S5. Programming of the manipulator electroplating process: Take the part as a tapered ring, determine the width of the electroplating surface as the maximum spacing in the height direction of all part seat numbers; According to the width of the brazing surface of the combustion chamber casing, design the electroplating electrode structure of a cuboid, the dimension in the length direction of the electrode is designed to be slightly larger than the maximum spacing in the height direction of all part seat numbers, and program the electroplating trajectory, set the electroplating speed, voltage, pressure, dipping cycle and electroplating time; S6. Trial electroplating: Simulate the operation of the electroplating program; S7. Electroplating with special nickel solution: Adjust the angle of the electroplating table to make the surface to be electroplated of the casing shell horizontal. The manipulator grabs the electroplating electrode, and the electroplating table rotates in cooperation. The electroplating electrode electroplates nickel in a full circle on the part. Control the thickness of the nickel layer by the electroplating speed and electroplating time. The electroplating speed is 45 - 75 mm / s, the voltage is 10 - 14 V, the dipping cycle is 20 - 30 s, the time is 6 - 8 min, and the electroplating pressure is 4 - 6 N; S8. Cleaning: The manipulator grabs the water gun and rinses the special nickel solution on the entire electroplating surface of the casing in a full circle while the electroplating table is rotating; S9. Electroplating with fast nickel solution: The surface to be electroplated of the casing shell is still horizontal. The manipulator grabs the electroplating electrode, and the electroplating table rotates in cooperation. The electroplating electrode electroplates nickel in a full circle on the part. Control the thickness of the nickel layer by the electroplating speed and electroplating time. The electroplating speed is 45 - 75 mm / s, the voltage is 10 - 14 V, the dipping cycle is 20 - 30 s, the time is 19 - 21 min, and the electroplating pressure is 4 - 6 N; S10. Cleaning: The manipulator grabs the water gun and rinses the fast nickel solution on the entire electroplating surface of the casing in a full circle while the electroplating table is rotating; S11. Rinsing: Remove the combustion chamber casing from the electroplating table and rinse it repeatedly with hot water until all the remaining nickel solution on the part is completely removed; S12. Inspection: Visually inspect the appearance and adhesion of the nickel layer.

2. The automatic nickel brush plating process for an aeroengine combustion chamber casing according to claim 1, characterized in that The electroplating process programming in step S5 includes: S501: Select the initial point and adjust the distance between the brush head and the part; S502: Plan the electroplating trajectory, use the "scirc" instruction to select the auxiliary point and the end point; S503: Use the control system to set the electroplating speed, electroplating voltage, pressure, dipping cycle and electroplating time when the manipulator uses special nickel solution and fast nickel solution; S504: After completing the program compilation, select the corresponding program number and start the automatic nickel electroplating function.

3. An automatic nickel electroplating process for an aeroengine combustion chamber casing according to claim 1, characterized in that, The upper part of the electroplating electrode is connected to the manipulator, and the outer surface is wrapped with a nickel envelope head cloth for liquid absorption.

4. An automatic nickel electroplating process for an aeroengine combustion chamber casing according to claim 1, characterized in that, In step S12, the appearance of the nickel layer is a pale yellowish silver-white nickel layer.

5. A process for automatically electroplating nickel on the casing of an aeroengine combustion chamber according to claim 1, characterized in that, In step S9, the deposited thickness of the nickel layer is 8 - 12 μm.

6. The automatic nickel electroplating process for an aeroengine combustion chamber casing according to claim 1, characterized in that, In step S2, place the large end of the casing shell downward on the electroplating tabletop, determine the position through the angular holes on the casing shell, and then fix the casing shell using a three-jaw chuck.

7. An automatic nickel brush plating process for an aeroengine combustion chamber casing according to claim 1, characterized in that, In step S3, the abrasive material is corundum sand with a mesh size of 200 - 240, the compressed air pressure is 0.2 MPa - 0.35 MPa, the sandblasting distance is 40 mm - 150 mm, and the sandblasting angle is 40° - 80°.

8. An automatic nickel brush plating process for an aeroengine combustion chamber casing according to claim 1, characterized in that In step S1, clean the combustion chamber casing with anhydrous ethanol or an ultrasonic cleaning line.

9. A system for an automatic nickel electroplating process of an aeroengine combustion chamber casing according to any one of claims 1 to 8, characterized in that, It includes: An enclosed electroplating room, with a waste liquid collection tank set on the floor of the enclosed electroplating room, and an exhaust system set in the enclosed room to collect the waste gas generated during electroplating operations; An electroplating tabletop, which is set in the enclosed electroplating room, is electrically connected to the control system, and is equipped with a fixing device and a rotating device for fixing the casing shell and driving the casing shell to rotate; An electroplating workbench, which is set in the enclosed electroplating room and is adjacent to the electroplating tabletop. There are multiple tanks on the electroplating workbench, and the tanks are filled with fast nickel solution and special nickel solution; A manipulator, which is connected to the control system and is set on one side of the electroplating tabletop. The manipulator is used to hold the electroplating electrode for electroplating operations; An electroplating power supply, which is connected to the control system. The negative pole of the power supply is connected to the electroplating tabletop to form a cathode, and the positive pole of the electroplating power supply is connected to the electroplating electrode to form an anode; A control system, which is provided with a program to control the electroplating speed, voltage, pressure, dipping cycle, and electroplating time of the manipulator.

10. The system of an automatic nickel electroplating process for an aeroengine combustion chamber casing according to claim 9, characterized in that, The exhaust system is connected to an external waste gas treatment system.

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