Aircraft engine part cyanide-free electroplating processing device and processing method

Abstract

The application discloses an aero-engine part cyanide-free electroplating 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-free electroplating processing technology are acceptance, water-based oil removal, liquid sand blasting, electrolytic oil removal, weak corrosion, cyanide-free copper pre-plating, cyanide-free silver pre-plating, cyanide-free silver plating, neutralization, hydrogen removal and inspection. The cyanide-free silver plating process is adopted to replace cyanide silver plating, the silver plating processing technology of the wandering star gear roller bearing retainer is optimized, the uneven distribution of electric lines caused by the special structure of the part is improved, the problems of uneven thickness and poor adhesion of the silver plating layer of the roller bearing retainer are solved, the quality of the silver plating layer of the roller bearing retainer is effectively improved, and the method has good popularization and application effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine parts processing, in particular to an aero-engine part cyanide-free electroplating processing device. In addition, the present application also relates to a processing method using the aero-engine part cyanide-free electroplating 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 are not intended to be, the admission that the work described in this section is prior art to the present application.

[0003] The silver plating layer has self-lubricating property and can effectively prevent adhesion at high temperature (below 650℃), and is commonly used in aero-engine bearing parts. The wandering star gear roller bearing retainer has a complex structure and has many grooves and bosses. Its structural diagram is shown in the accompanying drawings Figure 1 and the accompanying drawings Figure 2 The thickness of the conventional silver plating layer is required to be 5-8 μm or 8-12 μm, while the thickness of the silver layer of the wandering star gear roller bearing retainer is required to be 25-45 μm, which is far more than the thickness of the conventional silver plating.

[0004] In the electroplating process, due to the tip effect, the electric lines are easy to gather at the boss end surface of the part, while the electric lines in the grooves are shielded, so that the thickness of the plating layer at the boss end surface of the part is far more than that at the groove part. In order to meet the thickness requirement of the silver layer at the groove part of the wandering star gear roller bearing retainer, the conventional cyanide electroplating time is about 210 min-280 min. Since the longer the electroplating time is, the more obvious the tip effect is, the silver layer on the surface of the boss end surface of the part is easy to be rough and granular, while the thickness of the silver layer on the surface of the groove is thin, and the thickness of the silver layer is unevenly distributed. At the same time, due to the super-thick silver plating layer, the binding force of the silver plating layer cannot be guaranteed by the existing cyanide electroplating processing method, and the silver layer of the pocket often falls off during the use of the engine. The fault diagram is shown in the accompanying drawings Figure 2 In addition, if the oil stains on the surface of the part are not removed completely before the electroplating treatment, the subsequent electroplating effect will also be greatly affected. However, since the wandering star gear roller bearing retainer has a complex structure and has many grooves and bosses, it is difficult to completely clean the oil stains on the surface of the part.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen 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

[0006] In view of at least one of the above technical problems, the present application provides an aero-engine part cyanide-free electroplating processing device, which can stably clamp the roller bearing retainer and spray and flush it through the spraying assembly, realize sufficient cleaning of the surface of the roller bearing retainer, and ensure the effect of subsequent processing.

[0007] Meanwhile, the present application also provides a processing method using the above-mentioned aero-engine part cyanide-free electroplating processing device. The problems of uneven thickness and poor bonding force of the roller bearing retainer with many grooves and bosses during silver plating are solved, which can be popularized and applied to other parts with similar structures, and the silver plating processing period of the part is shortened, and the production efficiency is effectively improved.

[0008] According to one aspect of the present application, an aero-engine part cyanide-free electroplating processing device is provided for pretreating the surface of a roller bearing retainer, which comprises a pretreatment box, a liquid inlet pipe, a spraying assembly, a bearing, a sleeve, an oil storage pipe and an oil passing pipe:

[0009] 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 sleeve is sleeved on the outer ring of the bearing, the sleeve is used for clamping the inner hole of the roller bearing retainer, the 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 sleeve to tightly press the inner hole of the roller bearing retainer;

[0010] The liquid inlet pipe is arranged on the top of the pretreatment box, the spraying assembly is arranged above the 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 flushing the surface of the roller bearing retainer.

[0011] In some embodiments of the present application, the spraying assembly is arranged on one side of the center line of the sleeve so that the spraying direction of the treatment liquid has an angle with the radial direction of the roller bearing retainer, thereby enabling the roller bearing retainer to rotate around the axis of the bearing when being sprayed and flushed.

[0012] In some embodiments of the present application, the aero-engine part cyanide-free electroplating processing device further comprises a support plate assembly connected to the side wall of the pretreatment box, the support plate assembly is used to support the limiting spray assembly, the spray assembly comprises a first spray pipe and a second spray pipe, the first spray pipe is used to communicate with the liquid inlet pipe, the second spray pipe is a hose and symmetrically communicates with the side wall of the first spray pipe, the second spray pipes on both sides are used to spray the side surface of the roller bearing cage, and the first spray pipe is used to spray the outer ring of the roller bearing cage.

[0013] In some embodiments of the present application, the support plate assembly comprises a support plate and a rotating plate, the support plate is connected to 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 spray pipe, the rotating plate is used to drive the second spray pipe to rotate around the hinge point of the rotating plate, the first spray pipe is used to move up and down in the vertical direction and is arranged on the support plate, a fixing ring is arranged on the first spray pipe, a connecting piece is arranged between the fixing ring and the rotating plate, the first spray pipe is further used to move up and down in the vertical direction, drive the rotating plate to rotate through the connecting piece, and then drive the second spray pipe to rotate synchronously to adjust the spray angle.

[0014] In some embodiments of the present application, a telescopic rod is arranged on the top of the pretreatment box, the telescopic rod is used to support the limiting liquid inlet pipe and drive the liquid inlet pipe and the first spray pipe to move up and down.

[0015] In some embodiments of the present application, a first end of the liquid storage pipe is provided with a sealing plate, a compression spring is arranged in the liquid storage pipe and presses between the sealing plate and the piston.

[0016] In some embodiments of the present application, a first end of the sealing piece towards the outside of the oil inlet is provided with a hand wheel, a second end of the sealing piece is provided with a pushing piece, a first end of the pushing piece is connected with the sealing piece through threads, and a second end of the pushing piece is used to abut against the piston and drive the piston to move along the axial direction of the oil storage pipe.

[0017] According to another aspect of the present application, an aero-engine part cyanide-free electroplating processing method is also provided, which adopts the aero-engine part cyanide-free electroplating processing device, and comprises the following steps:

[0018] S100, clamping the roller bearing cage to the outer ring of the expansion sleeve, introducing the oil removal solution through the liquid inlet pipe, and removing the roller bearing cage after removing the oil on the surface of the roller bearing cage through the spray assembly;

[0019] S200, removing the oxide skin on the surface of the roller bearing cage in a liquid sandblasting manner;

[0020] S300, cleaning the surface of the roller bearing cage in an electrolytic oil removal manner to ensure that the surface state of the part is good;

[0021] S400, activating the cage of the roller bearing by using weak acid;

[0022] S500, pre-plating copper on the cage of the roller bearing without using cyanide;

[0023] S600, plating silver on the cage of the roller bearing without using cyanide;

[0024] S700, neutralizing the cage of the roller bearing after silver plating;

[0025] S800, then, carrying out hydrogen removal treatment on the cage of the roller bearing after silver plating in a vacuum furnace, and then carrying out final inspection.

[0026] In some embodiments of the present application, in step S200, the cage of the roller bearing is evenly wet-blasted with corundum sand, the particle size of the sand is 200-240 mesh, the pressure is 0.4-0.6 MPa, and the surface color of the part after sand blasting should be uniform; in step S500, the cage of the roller bearing is pre-plated with copper without using cyanide, the solution temperature is 50±10℃, the single-piece current is 1-3 A, and the time is 3-5 min.

[0027] In some embodiments of the present application, before step S600, the cage of the roller bearing is pre-plated with silver without using cyanide, and the part is charged into the tank at room temperature, the single-piece current is 0.1-0.24 A, and the time is 1-2 min; in step S600, the cage of the roller bearing is plated with silver without using cyanide, the part is charged into the tank at room temperature, the single-piece current is 0.6-2 A, the silver plating time is 90-150 min, and the part is turned over once to change the conductive contact position during the silver plating process.

[0028] The present application has the following beneficial effects:

[0029] The application discloses an aero-engine part cyanide-free electroplating processing device, which clamps and supports a roller bearing retainer through inserting a sleeve into an inner hole of the roller bearing retainer, and the sleeve is arranged on the bearing and can rotate with the sleeve. A pressure regulating cavity is arranged in the sleeve, the bearing is connected with an oil storage pipe, a plugging piece is arranged in an oil inlet of the oil storage pipe, a piston piece is movably arranged in the oil storage pipe, the plugging piece blocks the oil inlet, and the plugging piece pushes the piston piece to compress hydraulic oil in the oil storage pipe to enter the pressure regulating cavity through an oil pipe during the process of screwing into the oil inlet, so that the pressure in the pressure regulating cavity is increased, finally, the sleeve is extruded to tightly press the inner hole of the roller bearing retainer, the self-centering effect of the sleeve is realized, the stability of clamping the roller bearing retainer is improved, finally, a spraying assembly sprays treatment liquid to the surface of the roller bearing retainer to flush the surface, the roller bearing retainer rotates around the bearing under the action of spraying impact and gravity, the overall flushing effect of the roller bearing retainer can be realized, the cleaning degree of the surface of the roller bearing retainer is effectively improved, and the processing effect of the subsequent processing process is ensured.

[0030] The aero-engine part cyanide-free electroplating processing method also has the beneficial effects described above. After the roller bearing retainer is effectively cleaned and oil stains are removed, the surface of the roller bearing retainer is removed of oxide scales through liquid sandblasting, the surface of the roller bearing retainer is cleaned by electrolytic oil removal, the surface state of the roller bearing retainer is ensured to be good, the roller bearing retainer is activated by weak acid, then the roller bearing retainer is subjected to cyanide-free copper pre-plating and cyanide-free silver plating in sequence, finally, the roller bearing retainer is subjected to neutralization treatment and hydrogen removal treatment, so that the problems of uneven thickness and poor adhesion of the silver plating layer of the roller bearing retainer with many grooves and bosses during silver plating are effectively solved. The silver plating processing technology of the roller bearing retainer is optimized, the uneven distribution of electric lines caused by the special structure of the part is improved, the problems of uneven thickness and poor adhesion of the silver plating layer of the roller bearing retainer are solved, the quality of the silver plating layer of the roller bearing retainer is effectively improved, the silver plating processing period of the part is shortened, the production efficiency is significantly improved, and the method can be applied to other parts with similar structures.

[0031] Of course, implementing any product of the present application does not necessarily require all the advantages described above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0033] Figure 1 is a side view of a wandering star gear roller bearing retainer;

[0034] Figure 2 is a front view of a star gear roller bearing cage;

[0035] Figure 3 is a silver layer peeling diagram of a pocket of a star gear roller bearing cage;

[0036] Figure 4 is a structural schematic diagram of a pretreatment box of a preferred embodiment of the present application;

[0037] Figure 5 is a structural schematic diagram of a spraying assembly of a preferred embodiment of the present application;

[0038] Figure 6 is a structural schematic diagram of a swelling sleeve of a preferred embodiment of the present application;

[0039] Figure 7 is a structural schematic diagram of an oil storage pipe of a preferred embodiment of the present application;

[0040] Figure 8 is an installation schematic diagram of a swelling sleeve of a preferred embodiment of the present application;

[0041] Legend: 100, roller bearing cage; 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, swelling sleeve; 61, swelling sleeve inner ring; 62, swelling sleeve outer ring; 63, swelling 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. DETAILED DESCRIPTION

[0042] 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.

[0043] Figure 1 is a side view of a star gear roller bearing cage; Figure 2 is a front view of a star gear roller bearing cage; Figure 3 is a silver layer peeling diagram of a pocket of a star gear roller bearing cage; Figure 4 is a structural schematic diagram of a pretreatment box of a preferred embodiment of the present application; Figure 5 is a structural schematic diagram of a spraying assembly of a preferred embodiment of the present application; Figure 6 is a structural schematic diagram of a swelling sleeve of a preferred embodiment of the present application; Figure 7 is a structural schematic diagram of an oil storage pipe of a preferred embodiment of the present application; Figure 8 is an installation schematic diagram of a swelling sleeve of a preferred embodiment of the present application.

[0044] The application relates to an aero-engine part cyanide-free electroplating processing device, which is used for pretreating the surface of a roller bearing retainer 100 and comprises a pretreatment box 1, a liquid inlet pipe 2, a spraying assembly 3, a bearing 5, a sleeve 6, an oil storage pipe 7 and an oil passing pipe 8.

[0045] 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 and 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 sleeve 6 is sleeved on the outer ring of the bearing 5 and is used for clamping the inner hole of the roller bearing retainer 100, the 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 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, so that the pressure in the pressure regulating cavity 64 is increased to press the sleeve 6 and tightly press the inner hole of the roller bearing retainer 100;

[0046] The liquid inlet pipe 2 is arranged on the top of the pretreatment box 1, the spraying assembly 3 is arranged above the 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 flushing the surface of the roller bearing retainer 100.

[0047] The sleeve 6 is inserted into the inner hole of the roller bearing retainer 100 to clamp and support the roller bearing retainer 100, the sleeve 6 is sleeved on the bearing 5 and can rotate with the sleeve 6. The sleeve 6 is provided with the 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 the blocking piece 71, the oil storage pipe 7 is movably provided with the piston piece 73, the blocking piece 71 blocks the oil inlet and 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, so that the pressure in the pressure regulating cavity 64 is increased to press the sleeve 6 and tightly press the inner hole of the roller bearing retainer 100, the self-centering effect of the sleeve 6 is realized, the stability of clamping the roller bearing retainer 100 is improved, the treatment liquid is sprayed to the surface of the roller bearing retainer 100 by the spraying assembly 3 to flush the surface of the roller bearing retainer 100, the roller bearing retainer 100 rotates around the bearing 5 under the action of spraying impact and gravity, the overall flushing effect of the roller bearing retainer 100 can be realized, the cleaning degree of the surface of the roller bearing retainer 100 is effectively improved, and the processing effect of the subsequent treatment process is ensured.

[0048] Preferably, please refer to Figure 5As shown, 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 the roller bearing retainer 100 to rotate around the axis of the bearing 5.

[0049] 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.

[0050] Preferably, referring to Figure 1 As shown, the aero-engine part cyanide-free electroplating 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.

[0051] 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.

[0052] 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. Then the rotating plate 42 drives the second spraying pipe 32 of the flexible pipe structure to rotate to adjust the spraying angle. The spraying range can be expanded to adapt to the surface cleaning requirements of larger roller bearing retainers 100. Conversely, if smaller parts to be washed are targeted, the first spraying pipe 31 can be lowered to drive the two second spraying pipes 32 to fold 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.

[0053] 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.

[0054] 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 cage 100.

[0055] Preferably, the pretreatment box 1 is provided with a telescopic rod 12 at the top, which is used to support and drive the liquid inlet pipe 2 and the first spraying pipe 31 to ascend and descend.

[0056] It can be understood that the height of the liquid inlet pipe 2 and the first spraying pipe 31 can be adjusted through the telescopic rod 12, the overall spraying coverage area of the spraying assembly 3 is changed, and the spraying and flushing requirements of the roller bearing cage 100 of different sizes can be met.

[0057] Preferably, as shown in Figure 7 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, which is elastically pressed between the sealing plate and the piston 73.

[0058] 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 adjusting chamber 64.

[0059] Preferably, as shown in Figure 7 The first end of the sealing member 71 towards the outside of the oil inlet is provided with a hand wheel 75, and the second end of the sealing member 71 is provided with a pushing member 72. The first end of the pushing member 72 is threadedly connected with the sealing member 71, and the second end of the pushing member 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.

[0060] It can be understood that the sealing member 71 can be conveniently operated through the hand wheel 75, and the pushing member 72 can achieve the effect of extending the sealing member 71, so that the sealing member 71 can smoothly push the piston 73 to displace, realize the pressure adjustment of the pressure adjusting chamber 64, and complete the reinforced support and limiting of the inner hole of the roller bearing cage 100.

[0061] Optionally, the sealing member 71 is threadedly connected with the oil inlet, and the pushing member 72 is in the form of a stud.

[0062] The expansion sleeve 6 comprises an inner sleeve ring 61, an outer sleeve ring 62 and a sleeve side wall 63, the inner sleeve ring 61 is arranged on the outer ring of the bearing 5, the sleeve side wall 63 and the inner sleeve ring 61 and the outer sleeve ring 62 form a pressure regulating cavity 64, and the outer sleeve ring 62 is arranged to abut against the inner hole of the roller bearing retainer 100

[0063] According to another aspect of the present application, a cyanide-free electroplating processing method for an aero-engine part is also provided, which uses the cyanide-free electroplating processing device for the aero-engine part, and comprises the following steps:

[0064] 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, and then the roller bearing retainer 100 is taken out;

[0065] S200, the oxide skin on the surface of the roller bearing retainer 100 is removed by liquid sandblasting;

[0066] S300, the surface of the roller bearing retainer 100 is cleaned by electrolytic oil removal to ensure that the surface state of the part is good;

[0067] S400, the roller bearing retainer 100 is activated by weak acid;

[0068] S500, the roller bearing retainer 100 is pre-plated with copper without cyanide;

[0069] S600, the roller bearing retainer 100 is plated with silver without cyanide;

[0070] S700, the roller bearing retainer 100 plated with silver is neutralized;

[0071] S800, the roller bearing retainer 100 plated with silver is then treated to remove hydrogen in a vacuum furnace, and then subjected to final inspection.

[0072] The cyanide-free electroplating processing method of the aero-engine parts also has the beneficial effects described above. After effectively cleaning and removing oil stains from the roller bearing retainer 100, the surface of the roller bearing retainer 100 is further removed of the oxide skin through liquid sandblasting, and the surface of the roller bearing retainer 100 is cleaned by electrolytic oil removal to ensure that the surface state is good. After the roller bearing retainer 100 is activated by weak acid, the roller bearing retainer 100 is sequentially subjected to cyanide-free pre-copper plating and cyanide-free silver plating, and finally subjected to neutralization treatment and hydrogen removal treatment, thereby effectively solving the problems of uneven thickness and poor adhesion of the roller bearing retainer 100 with many grooves and bosses during silver plating. By optimizing the silver plating processing technology of the roller bearing retainer 100, the uneven distribution of electric lines caused by the special structure of the part is improved, the problems of uneven thickness and poor adhesion of the silver plating layer of the roller bearing retainer 100 are solved, the quality of the silver plating layer of the roller bearing retainer 100 is effectively improved, the silver plating processing cycle of the part is shortened, the production efficiency is significantly improved, and the technology can also be applied to other parts with similar structures.

[0073] Preferably, in step S200, the entire surface of the roller bearing retainer 100 is uniformly wet-blasted with corundum sand, the sand particle size is 200-240 mesh, the pressure is 0.4-0.6 MPa, and the surface color of the part after sandblasting should be uniform and consistent. In step S500, the entire surface of the roller bearing retainer 100 is pre-plated with copper without cyanide, the solution temperature is 50±10°C, the single-piece current is 1-3 A, and the time is 3-5 min.

[0074] It can be understood that the process of liquid sandblasting can effectively remove the oxide skin on the surface of the roller bearing retainer 100, ensuring the effectiveness of subsequent cyanide-free silver plating, and avoiding problems such as uneven thickness and poor adhesion during silver plating. The pre-treatment of pre-plating copper without cyanide on the surface of the roller bearing retainer 100 can facilitate the subsequent silver plating to adhere and form a silver plating layer on the surface of the roller bearing retainer 100, improve the adhesion of the silver plating layer, and prevent the silver plating layer from falling off during use.

[0075] Preferably, before step S600, the entire surface of the roller bearing retainer 100 is pre-plated with silver without cyanide, and the roller bearing retainer 100 is charged into the tank at room temperature, with a single-piece current of 0.1-0.24 A and a time of 1-2 min. In step S600, the entire surface of the roller bearing retainer 100 is plated with silver without cyanide, and the roller bearing retainer 100 is charged into the tank at room temperature, with a single-piece current of 0.6-2 A, a silver plating time of 90-150 min, and the part is turned over once every 15-20 min during silver plating to change the conductive contact position.

[0076] It can be understood that the application effectively reduces the plating time, reduces the tip effect, avoids the phenomenon that the silver layer on the surface of the convex end of the part is rough and granular, the silver layer on the surface of the groove is thin, and the silver layer thickness is uneven.

[0077] In summary, the application adopts a cyanide-free silver plating process to replace cyanide silver plating, optimizes the silver plating process of the roller bearing retainer 100, and the main process is: acceptance→ water-based oil removal→ liquid sandblasting→ electrolytic oil removal→ weak corrosion→ cyanide-free pre-plating copper→ cyanide-free pre-plating silver→ cyanide-free silver plating→ neutralization→ hydrogen removal→ inspection. The uneven distribution of electric lines caused by the special structure of the part is improved, the problems of uneven thickness of the silver plating layer and poor adhesion of the roller bearing retainer 100 are solved, the quality of the silver plating layer of the roller bearing retainer 100 is effectively improved, and the application effect is good.

[0078] It should be noted that in this paper, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment.

[0079] The principles and implementation modes of the application are described by applying specific examples in this paper, and the above examples are only used to help understand the method and its core idea. The above description is only the preferred embodiment of the application, and it should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the application, and the above technical features can be combined in an appropriate way. The improvement, decoration, change or combination, or the application of the inventive concept and technical scheme to other fields without improvement, shall be regarded as the protection of the application.

Claims

1. An aero-engine component cyanide-free electroplating processing device for pretreating the surface of a roller bearing cage (100), characterized in that, The cyanide-free electroplating processing device for aircraft engine parts 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) and an oil passing pipe (8). 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 connected 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).

2. The apparatus for processing aero-engine parts without cyanide electroplating 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) so that the spraying direction of the treatment liquid has 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 cyanide-free electroplating of an aeroengine component according to claim 1 or 2, characterized in that, The cyanide-free electroplating processing device for aircraft engine parts further comprises a support plate assembly (4) connected with the side wall of the pretreatment box (1), which is used for supporting 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 for being connected with the liquid inlet pipe (2), the second spraying pipe (32) is a flexible pipe and is symmetrically connected 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 device for processing the parts of aero-engine without cyanide electroplating according to claim 3, characterized in that, The support plate assembly (4) comprises a support plate (41) connected to 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 hinge point of the rotating plate (42), the first spray pipe (31) is used to move vertically through the support plate (41), a fixing ring (33) is sleeved on the first spray pipe (31), a connecting piece (34) is arranged between the fixing ring (33) and the rotating plate (42), and the first spray pipe (31) is also used to drive the rotating plate (42) to rotate through the connecting piece (34) in the vertical direction, so as to drive the second spray pipe (32) to rotate synchronously to adjust the spraying angle.

5. The apparatus for processing aero-engine parts without cyanide electroplating according to claim 4, characterized in that, The pretreatment box (1) is provided with a telescopic rod (12) at the top, and the telescopic rod (12) is used to support and drive the liquid inlet pipe (2) and the first spray pipe (31) to ascend and descend.

6. The apparatus for processing aero-engine parts without cyanide electroplating 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 the piston element (73).

7. The apparatus for processing aero-engine parts without cyanide electroplating according to claim 1, characterized in that, The first end of the sealing element (71) towards the outside of the oil inlet is provided with a hand wheel (75), and the second end of the sealing element (71) is provided with a pushing element (72), the first end of the pushing element (72) is connected with the sealing element (71) through threads, and the second end of the pushing element (72) is used to abut against the piston element (73) and drive the piston element (73) to move along the axial direction of the oil storage pipe (7).

8. A method for cyanide-free electroplating of an aeroengine component, characterized in that, The aero-engine part cyanide-free electroplating processing device and method of any one of claims 1-7, the aero-engine part cyanide-free electroplating 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 skin 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 oil removal to ensure that the surface state of the part is good; S400, the roller bearing retainer (100) is activated by weak acid; S500, the roller bearing retainer (100) is pre-plated with copper without cyanide; S600, the roller bearing retainer (100) is plated with silver without cyanide; S700, the silver-plated roller bearing retainer (100) is neutralized; S800, the silver-plated roller bearing retainer (100) is then subjected to hydrogen removal treatment in a vacuum furnace, and finally inspected. 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 skin 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 oil removal to ensure that the surface state of the part is good; S400, the roller bearing retainer (100) is activated by weak acid; S500, the roller bearing retainer (100) is pre-plated with copper without cyanide; S600, the roller bearing retainer (100) is plated with silver without cyanide; S700, the silver-plated roller bearing retainer (100) is neutralized; S800, the silver-plated roller bearing retainer (100) is then subjected to hydrogen removal treatment in a vacuum furnace, and finally inspected. ​ ​ ​ ​ ​ 9. The method of claim 8, wherein the method further comprises the step of: In step S200, the roller bearing cage (100) is evenly wet-blasted with corundum sand on all surfaces, the sand particle size is 200-240 mesh, the pressure is 0.4-0.6 MPa, and the surface color of the part after sand blasting should be uniform; in step S500, the roller bearing cage (100) is pre-plated with copper without cyanide on all surfaces, the solution temperature is 50±10°C, the single-piece current is 1-3 A, and the time is 3-5 min. ​ 10. The method of claim 8, wherein the method further comprises the step of: Before step S600, the roller bearing cage (100) is pre-plated with silver without cyanide on all surfaces, and the part is charged and placed in a tank at room temperature, the single-piece current is 0.1-0.24 A, and the time is 1-2 min; in step S600, the roller bearing cage (100) is plated with silver without cyanide on all surfaces, the part is charged and placed in a tank at room temperature, the single-piece current is 0.6-2 A, the silver plating time is 90-150 min, and the part is turned over once during the silver plating process to change the conductive contact position. ​

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