Aircraft engine part cyanide silver plating processing device and processing method

Abstract

The application discloses an aero-engine part cyanide silver plating processing device and a processing method, and belongs to the technical field of aero-engine part processing. Main process steps of the aero-engine part cyanide silver plating processing method are acceptance, water-based oil removal, liquid sand blasting, electrolytic oil removal, cyanide pre-plating copper, cyanide pre-plating silver, cyanide silver plating, neutralization, hydrogen removal and inspection. According to the structure size of a planet gear roller bearing retainer, the application optimizes the cyanide silver plating process in combination with the technical characteristics of the cyanide silver plating process. Pulse power is used to replace direct current power for cyanide silver plating processing. The distribution deposition of the silver plating layer is optimized by setting a suitable duty ratio, plating time and current density, so that the problem of uneven thickness of the silver plating layer on the surface of the part is solved. Meanwhile, a part pocket silver plating layer bonding force detection tool is designed, so that the problems of uneven thickness of the cyanide silver plating layer of the planet gear roller bearing retainer and difficulty in work surface pocket bonding force inspection are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft engine parts processing, in particular to an aircraft engine part cyanide silver plating processing device. In addition, the present application also relates to a processing method using the aircraft engine part cyanide silver plating processing device. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the present application. To the extent that the descriptions in this section describe the work of the inventors, and to the extent that the descriptions are not considered to be prior art to the present application, the descriptions are not, and should not be considered to be, admitted as prior art to the present application.

[0003] Silver plating layer has self-lubricating property, and can effectively prevent adhesion at high temperature (below 650 DEG C), and is commonly used in aircraft engine bearing parts. The wandering star gear roller bearing retainer has complex structure, and there are many grooves and bosses. Its structural diagram is shown in the accompanying drawings. Figure 1 and the accompanying drawings Figure 2 .

[0004] The inventors have found that, when the conventional direct current plating power source is used for cyanide silver plating, the electric field lines are prone to gather at the boss end face, and the electric field lines in the grooves are shielded, so that the silver layer on the boss surface is rough and granular, the silver layer on the groove surface is thin, and the silver layer thickness is unevenly distributed. If the oil stains on the part surface are not removed before plating treatment, the subsequent plating effect will also be greatly affected. However, due to the complex structure of the wandering star gear roller bearing retainer, there are many grooves and bosses, and it is difficult to completely clean the oil stains on the part surface.

[0005] At present, the conventional silver plating layer detection methods include bending method, extrusion method, file method, heating method and grid method. The bending method is suitable for thin plate plating parts, the extrusion method is suitable for riveting, extrusion and other small plating parts, the file method is suitable for large plating parts which are not bent or flattened, the heating method is suitable for plating parts with large difference between the thermal expansion coefficients of the plating layer and the base material, and the grid method is suitable for plating parts with regular plane.

[0006] The wandering star gear roller bearing retainer has special structure, and the upper and lower surfaces are in contact with the object to rotate, and there are 24 curved pockets. The conventional bonding force detection method cannot be directly used on the part, especially the silver plating layer on the surface of the pocket part, which may fall off during engine use. The pocket silver layer peeling fault diagram is shown in the accompanying drawings. Figure 2 .

[0007] It should be noted that the information disclosed in the above BACKGROUND section is only for strengthening the understanding of the background of the present application, and therefore can include information which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0008] In view of at least one of the above technical problems, the present application provides an aero-engine part cyanide silver plating processing device, which can realize sufficient cleaning of the surface of the roller bearing retainer by stably clamping the roller bearing retainer and spraying and washing it through the spraying assembly, and ensure the effect of subsequent processing; meanwhile, a loose star gear roller bearing retainer pocket hole silver plating layer bonding force detection assembly is designed to detect the quality of the plating layer on the working surface of the part, effectively avoiding the peeling failure of the silver plating layer of the part in the subsequent use process, and effectively improving the quality of the silver plating layer of the loose star gear roller bearing retainer.

[0009] Meanwhile, the present application also provides a processing method using the above aero-engine part cyanide silver plating processing device, which optimizes the loose star gear roller bearing retainer cyanide silver plating processing technology, improves the uneven distribution of electric lines caused by the special structure of the part, and solves the problem of uneven thickness of the silver plating layer of the loose star gear roller bearing retainer.

[0010] According to one aspect of the present application, an aero-engine part cyanide silver plating processing device is provided, which is used for pretreating the surface of a roller bearing retainer and also used for grid detection of the silver plating layer bonding force of a pocket hole with a curved surface on the roller bearing retainer, and the aero-engine part cyanide silver plating processing device comprises a pretreatment box, a liquid inlet pipe, a spraying assembly, a bearing, a expansion sleeve, an oil storage pipe, an oil passing pipe and a detection assembly:

[0011] The top of the pretreatment box is open, the bottom of the pretreatment box is provided with a sewage outlet, the oil storage pipe is arranged on the side wall of the pretreatment box, the oil storage pipe is used for storing hydraulic oil, the first end of the oil storage pipe is located in the pretreatment box and connected with the bearing, the expansion sleeve is sleeved on the outer ring of the bearing, the expansion sleeve is used for cooperating with the inner hole of the roller bearing retainer to clamp it, the expansion sleeve is provided with a pressure regulating cavity, the oil passing pipe is used for connecting the oil storage pipe with the pressure regulating cavity, the second end of the oil storage pipe is located outside the pretreatment box and provided with an oil inlet opening, the oil inlet opening is provided with a plugging piece, a piston piece is movably arranged in the oil storage pipe, the plugging piece is used for plugging the oil inlet opening and pushing the piston piece to compress the hydraulic oil in the oil storage pipe to enter the pressure regulating cavity through the oil passing pipe, thereby increasing the pressure in the pressure regulating cavity to press the expansion sleeve to tightly press the inner hole of the roller bearing retainer;

[0012] The liquid inlet pipe is arranged on the top of the pretreatment box, the spraying assembly is arranged above the expansion sleeve, the liquid inlet pipe is connected with the spraying assembly, the liquid inlet pipe is used for conveying treatment liquid to the spraying assembly, and the spraying assembly is used for spraying and washing the surface of the roller bearing retainer with the treatment liquid.

[0013] The detection assembly is used for gridding the wall surface of the curved pocket of the roller bearing cage to detect the bonding force of the silver plating layer.

[0014] In some embodiments of the present application, the spraying assembly is arranged on one side of the center line of the expansion sleeve so that the spraying direction of the treatment liquid has an angle with the radial direction of the roller bearing cage, and the roller bearing cage can be driven to rotate around the axis of the bearing when the roller bearing cage is sprayed and washed.

[0015] In some embodiments of the present application, the aero-engine part cyanide silver plating processing device further comprises a support plate assembly connected with the side wall of the pretreatment box, the support plate assembly is used for supporting the limiting spraying assembly, the spraying assembly comprises a first spraying pipe and a second spraying pipe, the first spraying pipe is used for communicating with the liquid inlet pipe, the second spraying pipe is a hose and symmetrically communicates with the side wall of the first spraying pipe, the second spraying pipes on both sides are used for spraying the side surface of the roller bearing cage, and the first spraying pipe is used for spraying the outer ring of the roller bearing cage.

[0016] In some embodiments of the present application, the support plate assembly comprises a support plate and a rotating plate, the support plate is connected with the side wall of the pretreatment box through a connecting rod, the rotating plate is hinged on both sides of the support plate, the rotating plate is connected with the second spraying pipe, the rotating plate is used for driving the second spraying pipe to rotate around the hinge point of the rotating plate, the first spraying pipe is used for moving in the vertical direction and is arranged on the support plate, a fixing ring is arranged on the first spraying pipe, a connecting piece is arranged between the fixing ring and the rotating plate, the first spraying pipe is also used for lifting and lowering in the vertical direction to drive the rotating plate to rotate through the connecting piece, and then the second spraying pipe is synchronously rotated to adjust the spraying angle.

[0017] In some embodiments of the present application, the first end of the liquid storage pipe is provided with a sealing plate, a compression spring is arranged in the liquid storage pipe and is pressed between the sealing plate and the piston piece; the first end of the blocking piece towards the outside of the oil inlet is provided with a hand wheel, the second end of the blocking piece is provided with a pushing piece, the first end of the pushing piece is connected with the blocking piece through threads, and the second end of the pushing piece is used for abutting against the piston piece and driving the piston piece to move along the axial direction of the oil storage pipe.

[0018] In some embodiments of the present application, the detection assembly comprises a first guide sleeve, a first scraper, a second scraper and a second guide sleeve, the first scraper is arranged on the first guide sleeve, the first guide sleeve is used for driving the first scraper to draw a horizontal detection line penetrating the silver plating layer on the pocket side wall of the roller bearing cage in the horizontal direction, the second guide sleeve is used for driving the second scraper to draw a vertical detection line penetrating the silver plating layer on the pocket side wall of the roller bearing cage in the vertical direction, and the horizontal detection line and the vertical detection line intersect to form a grid.

[0019] In some embodiments of the present application, the side of the first doctor blade in contact with the side wall of the pocket of the roller bearing cage is a uniform height baffle structure, and the side of the second doctor blade in contact with the side wall of the pocket of the roller bearing cage is a non-uniform height baffle structure for fitting the side wall of the pocket.

[0020] According to another aspect of the present application, there is also provided an aero-engine part cyanide silver plating processing method, which uses the aero-engine part cyanide silver plating processing device described above, and comprises the following steps:

[0021] S100, clamping the roller bearing cage to the expanded sleeve outer ring, introducing the oil removal solution through the liquid inlet pipe, and removing the oil on the surface of the roller bearing cage through the spraying assembly, and then taking out;

[0022] S200, using liquid sandblasting to remove the oxide skin on the surface of the roller bearing cage;

[0023] S300, using electrolytic oil removal to clean the surface of the roller bearing cage to ensure good surface state of the part;

[0024] S400, cyanide pre-plating copper on the surface of the roller bearing cage;

[0025] S500, cyanide pre-plating silver on the surface of the roller bearing cage;

[0026] S600, cyanide silver plating on the surface of the roller bearing cage;

[0027] S700, appearance quality inspection of the silver plating layer of the roller bearing cage after surface cyanide silver plating to ensure that the entire surface is silver plated, and the silver layer is silver-white, uniform and delicate;

[0028] S800, silver plating layer adhesion detection of the pocket of the roller bearing cage, using the detection assembly to draw a grid on the wall surface of the pocket of the roller bearing cage to detect the adhesion of the silver plating layer.

[0029] In some embodiments of the present application, in step S400, when cyanide pre-plating copper on the surface of the roller bearing cage, the single-piece current is 1A-2A, the solution temperature is 50℃±10℃, and the time is 3min-5min; in step S500, when cyanide pre-plating silver on the surface of the roller bearing cage, the current is 2A-4A at room temperature, and the time is 10s-30s.

[0030] In some embodiments of the present application, when cyanide silver plating is performed on the surface of the roller bearing retainer in step S600, a pulse mode is used for silver plating, the duty cycle is 80%, the tank is charged, the temperature is room temperature, the single-piece current is 0.5A to 1A, the cyanide silver plating time is 240min to 280min, and the parts are turned over once every 15min to 20min during the cyanide silver plating process to change the conductive contact position.

[0031] This application has the following beneficial effects:

[0032] The present application discloses a cyanide silver plating processing device for aircraft engine parts. An expansion sleeve is inserted into the inner bore of a roller bearing cage to clamp and support the cage. The expansion sleeve is mounted on the bearing, allowing the cage to rotate with the expansion sleeve. A pressure regulating chamber is defined within the expansion sleeve. The bearing is connected to an oil reservoir pipe. A sealing member is disposed within the oil inlet of the reservoir pipe. A piston is movably disposed within the reservoir pipe. The sealing member seals the oil inlet, and as the sealing member is screwed into the oil inlet, it pushes the piston to compress hydraulic oil within the reservoir pipe, which enters the pressure regulating chamber through the oil pipe. This increases the pressure within the pressure regulating chamber, ultimately squeezing the expansion sleeve against the inner bore of the roller bearing cage, achieving a self-centering effect for the expansion sleeve and improving the stability of the roller bearing cage clamping. Finally, a spray assembly sprays a treatment fluid onto the surface of the roller bearing cage to rinse it. Under the action of the spray impact and gravity, the roller bearing cage rotates around the bearing, achieving a comprehensive rinse effect on the roller bearing cage, effectively improving the cleanliness of its surface and ensuring the processing effect of subsequent processing.

[0033] The present application can also use the detection component to scratch the wall surface of the curved pocket of the roller bearing cage to detect the bonding strength of the silver plating layer, thereby solving the problem of difficulty in inspecting the bonding strength of non-planar plating, and can also be extended to other parts with similar structures.

[0034] The cyanide silver plating method for aircraft engine parts in the present application also has the above-mentioned beneficial effects. It also includes, after effectively cleaning and removing oil stains from the roller bearing cage, removing the oxide scale on its surface by liquid sandblasting, and then cleaning the surface of the roller bearing cage by electrolytic degreasing to ensure that its surface condition is good, and then sequentially performing cyanide pre-copper plating and cyanide pre-silver plating treatments, and finally performing cyanide silver plating, thereby effectively solving the problems of uneven thickness and poor bonding during the silver plating process of roller bearing cages with a large number of grooves and bosses. The present application solves the problems of uneven thickness and poor bonding of the silver plating layer of the roller bearing cage by optimizing the silver plating process of the roller bearing cage, improving the uneven distribution of electric lines caused by the special structure of the parts, and effectively improving the quality of the silver plating layer of the roller bearing cage.

[0035] Of course, implementing any of the products of the present application does not necessarily require that all of the above-mentioned advantages be achieved simultaneously. In addition to the objects, features, and advantages described above, the present application has additional objects, features, and advantages. These will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the present application, illustrate preferred embodiments of the present application, and assist in

[0037] Figure 1 is a side view diagram of a floating star gear roller bearing cage;

[0038] Figure 2 is a front view diagram of a floating star gear roller bearing cage;

[0039] Figure 3 is a silver layer peeling diagram of a pocket of a star gear roller bearing cage;

[0040] Figure 4 is a structure diagram of a pre-treatment box of a preferred embodiment of the present application;

[0041] Figure 5 is a structure diagram of a spraying assembly of a preferred embodiment of the present application;

[0042] Figure 6 is a structure diagram of a swelling sleeve of a preferred embodiment of the present application;

[0043] Figure 7 is a structure diagram of an oil storage pipe of a preferred embodiment of the present application;

[0044] Figure 8 is an installation diagram of a swelling sleeve of a preferred embodiment of the present application;

[0045] Figure 9 is a structure diagram of a detection assembly of a preferred embodiment of the present application;

[0046] Figure 10 is a use state diagram of a detection assembly of a preferred embodiment of the present application;

[0047] Legend: 100, roller bearing retainer; 1, pretreatment box; 11, sewage outlet; 12, telescopic rod; 2, liquid inlet pipe; 3, spraying assembly; 31, first spraying pipe; 32, second spraying pipe; 33, fixed ring; 34, connecting piece; 4, support plate assembly; 41, support plate; 42, rotating plate; 5, bearing; 6, expansion sleeve; 61, expansion sleeve inner ring; 62, expansion sleeve outer ring; 63, expansion sleeve side wall; 64, pressure regulating cavity; 7, oil storage pipe; 71, plugging piece; 72, pushing piece; 73, piston piece; 74, compression spring; 75, hand wheel; 8, oil passing pipe; 9, detection assembly; 91, first handle; 92, first guide sleeve; 93, first scraper; 94, second scraper; 95, second guide sleeve; 96, positioning pin; 97, locking piece; 98, second handle. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0049] Figure 1 is a side view diagram of a planetary gear roller bearing retainer; Figure 2 is a front view diagram of a planetary gear roller bearing retainer; Figure 3 is a silver layer peeling diagram of a pocket of a planetary gear roller bearing retainer; Figure 4 is a structure schematic diagram of a pretreatment box of the preferred embodiment of the present application; Figure 5 is a structure schematic diagram of a spraying assembly of the preferred embodiment of the present application; Figure 6 is a structure schematic diagram of an expansion sleeve of the preferred embodiment of the present application; Figure 7 is a structure schematic diagram of an oil storage pipe of the preferred embodiment of the present application; Figure 8 is an installation schematic diagram of an expansion sleeve of the preferred embodiment of the present application;

[0050] Figure 9 is a structure schematic diagram of a detection assembly of the preferred embodiment of the present application; Figure 10 is a use state schematic diagram of a detection assembly of the preferred embodiment of the present application.

[0051] An aero-engine part cyanide silver plating processing device is used for pretreating the surface of a roller bearing retainer 100 and also used for grid detection and silver plating layer bonding force of a pocket with a curved surface on the roller bearing retainer 100. The aero-engine part cyanide silver plating processing device comprises a pretreatment box 1, a liquid inlet pipe 2, a spraying assembly 3, a bearing 5, an expansion sleeve 6, an oil storage pipe 7, an oil passing pipe 8 and a detection assembly 9.

[0052] The top of the pretreatment box 1 is open, the bottom of the pretreatment box 1 is provided with a sewage outlet 11, the oil storage pipe 7 is arranged on the side wall of the pretreatment box 1, the oil storage pipe 7 is used for storing hydraulic oil, the first end of the oil storage pipe 7 is located in the pretreatment box 1 and is connected with the bearing 5, the expansion sleeve 6 is sleeved on the outer ring of the bearing 5, the expansion sleeve 6 is used for cooperating with the inner hole of the roller bearing retainer 100 to clamp the roller bearing retainer 100, the expansion sleeve 6 is provided with a pressure regulating cavity 64, the oil passing pipe 8 is used for connecting the oil storage pipe 7 and the pressure regulating cavity 64, the second end of the oil storage pipe 7 is located outside the pretreatment box 1 and the second end of the oil storage pipe 7 is provided with an oil inlet, the oil inlet is provided with a blocking piece 71, the oil storage pipe 7 is movably provided with a piston piece 73, the blocking piece 71 is used for blocking the oil inlet and pushing the piston piece 73 to compress the hydraulic oil in the oil storage pipe 7 to enter the pressure regulating cavity 64 through the oil passing pipe 8 during the process of screwing into the oil inlet, thereby increasing the pressure in the pressure regulating cavity 64 to press the expansion sleeve 6 to tightly press the inner hole of the roller bearing retainer 100;

[0053] The liquid inlet pipe 2 is arranged on the top of the pretreatment box 1, the spraying assembly 3 is arranged above the expansion sleeve 6, the liquid inlet pipe 2 is communicated with the spraying assembly 3, the liquid inlet pipe 2 is used for conveying treatment liquid to the spraying assembly 3, and the spraying assembly 3 is used for spraying and washing the surface of the roller bearing retainer 100.

[0054] The detection assembly 9 is used for marking the wall surface of the curved pocket of the roller bearing retainer 100 to detect the bonding force of the silver plating layer.

[0055] The application inserts the expansion sleeve 6 into the inner hole of the roller bearing retainer 100 to clamp and support the roller bearing retainer 100, and the expansion sleeve 6 is sleeved on the bearing 5, so that the roller bearing retainer 100 can rotate with the expansion sleeve 6. The expansion sleeve 6 is provided with a pressure regulating cavity 64, the bearing 5 is connected with the oil storage pipe 7, the oil inlet of the oil storage pipe 7 is provided with a blocking piece 71, the oil storage pipe 7 is movably provided with a piston piece 73, the oil inlet is blocked by the blocking piece 71, and the blocking piece 71 pushes the piston piece 73 to compress the hydraulic oil in the oil storage pipe 7 to enter the pressure regulating cavity 64 through the oil passing pipe 8 during the process of screwing into the oil inlet, thereby increasing the pressure in the pressure regulating cavity 64, finally realizing the pressing of the expansion sleeve 6 to tightly press the inner hole of the roller bearing retainer 100, realizing the self-centering effect of the expansion sleeve 6, improving the stability of clamping the roller bearing retainer 100, and finally spraying the treatment liquid to the surface of the roller bearing retainer 100 by the spraying assembly 3 to wash the surface of the roller bearing retainer 100, so that the roller bearing retainer 100 rotates around the bearing 5 under the action of spraying impact and gravity, which can realize the overall washing effect of the roller bearing retainer 100, effectively improve the cleaning degree of the surface, and ensure the processing effect of the subsequent processing process. The application can also mark the wall surface of the curved pocket of the roller bearing retainer 100 by the detection assembly 9 to detect the bonding force of the silver plating layer, so as to solve the problem that the bonding force of the non-planar plating layer is difficult to check, and can also be popularized for other similar parts.

[0056] Preferably, please refer to Figure 5 As shown in the figure, the spraying assembly 3 is arranged on one side of the line of the expansion sleeve 6 to make the spraying direction of the treatment liquid have an angle with the radial direction of the roller bearing retainer 100, and then when the roller bearing retainer 100 is sprayed and washed, it can drive it to rotate around the axis of the bearing 5.

[0057] It can be understood that in order to more smoothly rotate the roller bearing retainer 100 while spraying and washing, by tilting the spraying angle of the spraying assembly 3, the roller bearing retainer 100 can be quickly rotated during spraying and washing to realize all-round washing of the surface of the roller bearing retainer 100, which is beneficial to improve the cleaning effect and speed up the cleaning efficiency.

[0058] Preferably, please refer to Figure 1 As shown in the figure, the aero-engine part cyanide silver plating processing device further comprises a support plate assembly 4 connected with the side wall of the pretreatment box 1, which is used to support the limiting spraying assembly 3. The spraying assembly 3 comprises a first spraying pipe 31 and a second spraying pipe 32. The first spraying pipe 31 is used to communicate with the liquid inlet pipe 2. The second spraying pipe 32 is a flexible pipe and symmetrically communicates with the side wall of the first spraying pipe 31. The two second spraying pipes 32 are used to spray the side surface of the roller bearing retainer 100, and the first spraying pipe 31 is used to spray the outer ring of the roller bearing retainer 100.

[0059] Specifically, the support plate assembly 4 comprises a support plate 41 and a rotating plate 42. The support plate 41 is connected with the side wall of the pretreatment box 1 through a connecting rod. The rotating plate 42 is hinged on both sides of the support plate 41. The rotating plate 42 is connected with the second spraying pipe 32. The rotating plate 42 is used to drive the second spraying pipe 32 to rotate around the hinge point of the rotating plate 42. The first spraying pipe 31 is used to move up and down in the vertical direction and is arranged on the support plate 41. A fixing ring 33 is arranged on the first spraying pipe 31. A connecting piece 34 is arranged between the fixing ring 33 and the rotating plate 42. The first spraying pipe 31 is used to move up and down in the vertical direction, drive the rotating plate 42 to rotate through the connecting piece 34, and then drive the second spraying pipe 32 to rotate synchronously to adjust the spraying angle.

[0060] It can be understood that the first spraying pipe 31 can move up and down in the vertical direction. When the first spraying pipe 31 is lifted, the connecting piece 34 is pulled to drive the rotating plate 42 to rotate through the fixing ring 33, and then the rotating plate 42 drives the second spraying pipe 32 of the flexible pipe structure to rotate to adjust the angle of the spraying. The range of spraying can be expanded to adapt to the cleaning needs of the surface of the larger roller bearing retainer 100. Conversely, if it is for smaller parts to be washed, the first spraying pipe 31 can be lowered and the two second spraying pipes 32 can be brought together inward to reduce the spraying range for concentrated washing, effectively improving the washing effect and adapting to the spraying and washing working conditions of different sizes of parts to be washed.

[0061] Optionally, the connecting member 34 is in the form of a pull rope or an elastic band. Of course, the connecting member 34 can also be in the form of a rod structure, and both ends of the connecting member 34 are hingedly connected.

[0062] Optionally, the rotating plate 42 is in the form of an L-shaped structure, and the second spraying pipe 32 is bound to the rotating plate 42 and can be bent through the bending part of the rotating plate 42 to realize the bending of the second spraying pipe 32 to present a certain angle for spraying and flushing, so as to accurately flush the side surface of the roller bearing retainer 100.

[0063] Preferably, the top of the pretreatment box 1 is provided with a telescopic rod 12, which is used to support and drive the liquid inlet pipe 2 and the first spraying pipe 31 to ascend and descend. The telescopic rod 12 can adjust the height of the liquid inlet pipe 2 and the first spraying pipe 31, and the Jenuoer can change the overall spraying coverage area of the spraying assembly 3 to meet the spraying and flushing requirements of roller bearing retainers 100 of different sizes.

[0064] Preferably, please refer to Figure 7 The first end of the liquid storage pipe 7 is provided with a sealing plate, the liquid storage pipe 7 is provided with a compression spring 74, the compression spring 74 is elastically pressed between the sealing plate and the piston 73; the first end of the blocking piece 71 towards the outside of the oil inlet is provided with a hand wheel 75, the second end of the blocking piece 71 is provided with a pushing piece 72, the first end of the pushing piece 72 is connected with the blocking piece 71 through threads, and the second end of the pushing piece 72 is used to abut against the piston 73 and push the piston 73 to move along the axial direction of the oil storage pipe 7.

[0065] It can be understood that the compression spring 74 can provide an elastic force to push the piston 73 away from the sealing plate, so as to realize the reset of the piston 73, which is beneficial to control the displacement of the piston 73 and realize the accurate control of the pressure of the pressure regulating cavity 64.

[0066] The present application can conveniently operate the blocking piece 71 through the hand wheel 75, and the pushing piece 72 can achieve the effect of extending the blocking piece 71, so that the blocking piece 71 can smoothly push the piston 73 to displace, realize the pressure adjustment of the pressure regulating cavity 64, and complete the reinforced support and limitation of the inner hole of the roller bearing retainer 100.

[0067] Optionally, the blocking piece 71 is connected with the oil inlet through threads, and the pushing piece 72 is in the form of a stud.

[0068] The expansion sleeve 6 includes an expansion sleeve inner ring 61, an expansion sleeve outer ring 62 and an expansion sleeve side wall 63, the expansion sleeve inner ring 61 is used to be sleeved on the outer ring of the bearing 5, the expansion sleeve side wall 63 and the expansion sleeve outer ring 62 surround the expansion sleeve inner ring 61 to form the pressure regulating cavity 64, and the expansion sleeve outer ring 62 is used to abut against the inner hole of the roller bearing retainer 100

[0069] Preferably, please refer toFigure 9 、 10 As shown, the detection assembly 9 includes a first guide sleeve 92, a first scraper 93, a second scraper 94 and a second guide sleeve 95. The first scraper 93 is arranged on the first guide sleeve 92. The first guide sleeve 92 is used to drive the first scraper 93 to scratch a horizontal detection line penetrating the silver-plated layer on the side wall of the pocket of the roller bearing retainer 100 in the horizontal direction. The second guide sleeve 95 is used to drive the second scraper 94 to scratch a vertical detection line penetrating the silver-plated layer on the side wall of the pocket of the roller bearing retainer 100 in the vertical direction. The horizontal detection line and the vertical detection line intersect to form a grid.

[0070] Specifically, the side of the first scraper 93 that contacts the side wall of the pocket of the roller bearing retainer 100 is a contoured grate structure with uniform length, and the side of the second scraper 94 that contacts the side wall of the pocket of the roller bearing retainer 100 is a non-concave grate structure with different lengths for fitting with the side wall of the pocket.

[0071] It can be understood that the present application designs a curved surface bonding force detection tool that matches the shape and size of the pocket of the roller bearing retainer 100. The first scraper 93 with an equal-height grate structure of uniform length is used to draw a detection line on the side wall of the pocket in the horizontal direction, and the second scraper 4 with a non-equal-height grate structure of different lengths is used to draw a detection line on the side wall of the pocket in the vertical direction. The horizontal and vertical detection lines intersect to form a grid, which can effectively detect the bonding force of the silver plating layer. The scraping operation is used to make the scraper penetrate the silver plating layer to the surface of the substrate. If the silver layer on the surface of the part has no peeling, blistering, falling off, etc., the test result is qualified, and the effect and quality of the silver plating can be intuitively judged.

[0072] According to another aspect of the present application, a method for cyanide silver plating of aircraft engine parts is provided, which uses the above-mentioned cyanide silver plating device for aircraft engine parts and includes the following steps:

[0073] S100, clamp the roller bearing cage 100 to the outer ring of the expansion sleeve 6, introduce degreasing solution through the liquid inlet pipe 2, and use the spray assembly 3 to degrease the surface of the roller bearing cage 100 before removing it;

[0074] S200, using liquid sand blasting to remove the oxide scale on the surface of the roller bearing cage 100;

[0075] S300, using electrolytic degreasing to clean the surface of the roller bearing cage 100 to ensure that the surface of the part is in good condition;

[0076] S400, performing cyanide pre-copper plating on the surface of the roller bearing cage 100;

[0077] S500, performing cyanide pre-silver plating on the surface of the roller bearing cage 100;

[0078] S600, cyanide silver plating is performed on the surface of the roller bearing cage 100;

[0079] S700, appearance quality inspection is performed on the silver plating layer of the roller bearing cage 100 after the surface cyanide silver plating, to ensure that the entire surface is silver plated, and the silver layer is silvery white and uniform and fine;

[0080] S800, the binding force of the silver plating layer of the pocket of the roller bearing cage 100 is detected by using the detection assembly 9 to draw grids on the wall surface of the pocket of the roller bearing cage 100.

[0081] In step S200, the entire surface of the roller bearing cage 100 is evenly wet-blasted with corundum sand, the sand particle size is 200-240 mesh, and the pressure is 0.4-0.6 MPa. After sand blasting, the surface color of the part should be uniform. The process of liquid sand blasting can effectively remove the oxide scale on the surface of the roller bearing cage 100, ensure the effect of subsequent cyanide-free silver plating, and avoid problems such as uneven thickness and poor binding force during silver plating.

[0082] The aviation engine part cyanide silver plating processing method also has the above beneficial effects. After the roller bearing cage 100 is effectively cleaned and the oil stains are removed, the surface oxide scale is removed by liquid sand blasting, the surface of the roller bearing cage 100 is cleaned by electrolytic oil removal, the surface state is ensured to be good, cyanide copper pre-plating and cyanide silver pre-plating are sequentially performed, and finally cyanide silver plating is performed, thereby effectively solving the problems of uneven thickness and poor binding force of the roller bearing cage 100 with many grooves and bosses during silver plating. By optimizing the silver plating processing technology of the roller bearing cage 100, the uneven distribution of electric lines caused by the special structure of the part is improved, the problems of uneven thickness and poor binding force of the silver plating layer of the roller bearing cage 100 are solved, and the quality of the silver plating layer of the roller bearing cage 100 is effectively improved.

[0083] Preferably, in step S400, when the roller bearing cage 100 is cyanide copper pre-plated, the single-piece current is 1-2 A, the solution temperature is 50±10℃, and the time is 3-5 min; in step S500, when the roller bearing cage 100 is cyanide silver pre-plated, the single-piece current is 2-4 A, and the time is 10-30 s.

[0084] The cyanide-free copper pre-plating pretreatment on the surface of the roller bearing cage 100 can facilitate the subsequent cyanide-free silver plating to smoothly adhere and form a silver plating layer on the surface of the roller bearing cage 100, improve the binding force of the silver plating layer, and avoid failures such as silver plating layer falling off during use of the part.

[0085] Preferably, when the surface of the roller bearing cage 100 is cyanide silver plated in step S600, pulse mode is used for silver plating, the duty cycle is 80%, the tank is charged, the temperature is room temperature, the single piece current is 0.5A-1A, the cyanide silver plating time is 240min-280min, and the part is turned over once to change the conductive contact position in 15min-20min during cyanide silver plating.

[0086] It should be noted that the pulse power is used instead of the direct current power for cyanide silver plating processing in the present application, and the appropriate duty cycle, plating time and current density are set to optimize the distribution and deposition of the silver plating layer, solve the problem of uneven thickness of the silver plating layer on the surface of the part, have strong overall operability, improve the silver plating quality of the part, and have good popularization effect.

[0087] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices.

[0088] The principles and implementation modes of the present application are described by applying specific examples in this document, and the above examples are only used to help understand the method of the present application and its core idea. The above description is only the preferred implementation mode of the present application, and it should be pointed out that due to the limited nature of the language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can be combined in an appropriate way; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical scheme to other occasions without improvement, should be regarded as the protection of the present application.

Claims

1. A cyanide silver plating processing device for aircraft engine parts, used for pre-treating the surface of a roller bearing cage (100), and also used for performing a cross-cutting test on the curved pockets on the roller bearing cage (100) to detect the bonding strength of the silver plating layer, characterized in that: The aero-engine part cyanide silver plating processing device comprises a pretreatment box (1), a liquid inlet pipe (2), a spraying assembly (3), a bearing (5), a expansion sleeve (6), an oil storage pipe (7), an oil passing pipe (8) and a detection assembly (9): The top of the pretreatment box (1) is open, the bottom of the pretreatment box (1) is provided with a sewage outlet (11), the oil storage pipe (7) is arranged on the side wall of the pretreatment box (1), the oil storage pipe (7) is used for storing hydraulic oil, the first end of the oil storage pipe (7) is located in the pretreatment box (1) and is connected with the bearing (5), the expansion sleeve (6) is sleeved on the outer ring of the bearing (5), the expansion sleeve (6) is used for cooperating with the inner hole of the roller bearing retainer (100) to clamp it, the expansion sleeve (6) is provided with a pressure regulating cavity (64), the oil passing pipe (8) is used for connecting the oil storage pipe (7) with the pressure regulating cavity (64), the second end of the oil storage pipe (7) is located outside the pretreatment box (1) and is provided with an oil inlet, the oil inlet is provided with a blocking piece (71), the oil storage pipe (7) is movably provided with a piston (73), the blocking piece (71) is used for blocking the oil inlet and pushing the piston (73) to compress the hydraulic oil in the oil storage pipe (7) to enter the pressure regulating cavity (64) through the oil passing pipe (8) during the process of screwing into the oil inlet, thereby increasing the pressure in the pressure regulating cavity (64) to press the expansion sleeve (6) to tightly press the inner hole of the roller bearing retainer (100); The liquid inlet pipe (2) is arranged on the top of the pretreatment box (1), the spraying assembly (3) is arranged above the expansion sleeve (6), the liquid inlet pipe (2) is communicated with the spraying assembly (3), the liquid inlet pipe (2) is used for conveying treatment liquid to the spraying assembly (3), the spraying assembly (3) is used for spraying and washing the surface of the roller bearing retainer (100); The detection assembly (9) is used for marking the wall surface of the curved pocket of the roller bearing retainer (100) to detect the bonding force of the silver plating layer.

2. The aircraft engine part cyanide silver plating processing device according to claim 1, characterized in that, The spraying assembly (3) is arranged on one side of the center line of the expansion sleeve (6) to make the spraying direction of the treatment liquid have an angle with the radial direction of the roller bearing retainer (100), thereby enabling the roller bearing retainer (100) to rotate around the axis of the bearing (5) when being sprayed and washed.

3. The device for processing aero-engine parts by cyanide silver plating according to claim 1 or 2, characterized in that, The aero-engine part cyanide silver plating processing device further comprises a support plate assembly (4) connected with the side wall of the pretreatment box (1), the support plate assembly (4) is used for supporting and limiting the spraying assembly (3), the spraying assembly (3) comprises a first spraying pipe (31) and a second spraying pipe (32), the first spraying pipe (31) is used for being communicated with the liquid inlet pipe (2), the second spraying pipe (32) is a flexible pipe and is symmetrically communicated with the side wall of the first spraying pipe (31), the two second spraying pipes (32) are used for spraying the side surface of the roller bearing retainer (100), and the first spraying pipe (31) is used for spraying the outer ring of the roller bearing retainer (100).

4. The aircraft engine part cyanide silver plating processing device according to claim 3, characterized in that, The support plate assembly (4) comprises a support plate (41) connected with the side wall of the pretreatment box (1) through a connecting rod and a rotating plate (42) hinged on both sides of the support plate (41), the rotating plate (42) is connected with the second spray pipe (32), and the rotating plate (42) is used to drive the second spray pipe (32) to rotate around the hinged point of the rotating plate (42); the first spray pipe (31) is used to move in the vertical direction and is arranged on the support plate (41); a fixing ring (33) is arranged on the first spray pipe (31); a connecting piece (34) is arranged between the fixing ring (33) and the rotating plate (42); the first spray pipe (31) is used to drive the rotating plate (42) to rotate through the connecting piece (34) in the vertical direction, and then the second spray pipe (32) is driven to rotate synchronously to adjust the spraying angle.

5. The aircraft engine part cyanide silver plating processing device according to claim 1, characterized in that, The first end of the liquid storage pipe (7) is provided with a sealing plate, and the liquid storage pipe (7) is provided with a compression spring (74) arranged between the sealing plate and a piston element (73); the first end of the plugging element (71) towards the outside of the oil inlet is provided with a hand wheel (75), and the second end of the plugging element (71) is provided with a pushing element (72); the first end of the pushing element (72) is connected with the plugging element (71) through threads, and the second end of the pushing element (72) is used to abut against the piston element (73) and push the piston element (73) to move along the axial direction of the oil storage pipe (7).

6. The aircraft engine part cyanide silver plating processing device according to claim 1, characterized in that, The detection assembly (9) comprises a first guide sleeve (92), a first scraper (93), a second scraper (94) and a second guide sleeve (95), the first scraper (93) is arranged on the first guide sleeve (92), the first guide sleeve (92) is used to drive the first scraper (93) to draw a horizontal detection line penetrating the silver plating layer on the side wall of the pocket of the roller bearing retainer (100) in the horizontal direction, the second guide sleeve (95) is used to drive the second scraper (94) to draw a vertical detection line penetrating the silver plating layer on the side wall of the pocket of the roller bearing retainer (100) in the vertical direction, and the horizontal detection line and the vertical detection line intersect to form a grid.

7. The aircraft engine part cyanide silver plating processing device according to claim 6, characterized in that, The side of the first scraper (93) in contact with the side wall of the pocket of the roller bearing retainer (100) is a uniform-elevation comb structure, and the side of the second scraper (94) in contact with the side wall of the pocket of the roller bearing retainer (100) is a non-uniform-elevation comb structure used to fit the side wall of the pocket.

8. An aeroengine component cyanide silver plating process, characterized by, The aero-engine part cyanide silver plating processing device and method adopt the device of any one of claims 1-7, and the aero-engine part cyanide silver plating processing method comprises the following steps: S100, the roller bearing retainer (100) is clamped to the outer ring of the expansion sleeve (6), the oil removal solution is introduced through the liquid inlet pipe (2), and the surface of the roller bearing retainer (100) is cleaned by the spraying assembly (3); S200, the oxide scale on the surface of the roller bearing retainer (100) is removed by liquid sandblasting; S300, the surface of the roller bearing retainer (100) is cleaned by electrolytic degreasing to ensure that the surface state of the part is good; S400, the surface of the roller bearing retainer (100) is pre-plated with copper by cyanide; ​ ​ S500, cyanide pre-plating silver on the surface of the roller bearing retainer (100); S600, cyanide silver plating on the surface of the roller bearing retainer (100); S700, appearance quality inspection of the silver plating layer of the roller bearing retainer (100) after the surface cyanide silver plating, ensuring that the entire surface is silver plated, and the silver layer is silver-white, uniform and delicate; S800, silver plating layer adhesion detection of the pockets of the roller bearing retainer (100), using a detection assembly (9) to draw grids on the wall surface of the pockets of the roller bearing retainer (100) to detect the adhesion of the silver plating layer.

9. The method according to claim 8, wherein the silver cyanide plating process is performed on an aeroengine part. In step S400, when the roller bearing retainer (100) surface is pre-plated with copper by cyanide, the single piece current is 1A-2A, the solution temperature is 50℃±10℃, and the time is 3min-5min; in step S500, when the roller bearing retainer (100) surface is pre-plated with silver by cyanide, the current is turned off in the tank, the temperature is room temperature, the single piece current is 2A-4A, and the time is 10s-30s.

10. The method of claim 8, wherein the silver cyanide plating process is performed on an aeroengine part. In step S600, when the roller bearing retainer (100) surface is plated with silver by cyanide, pulse mode is used for silver plating, the duty cycle is 80%, the current is turned off in the tank, the temperature is room temperature, the single piece current is 0.5A-1A, the cyanide silver plating time is 240min-280min, and the parts are turned over once every 15min-20min during the cyanide silver plating process to change the conductive contact position.

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