Cyanide-free electroplating processing device and method for aero-engine parts

Abstract

The invention discloses a cyanide-free electroplating machining device and method for aero-engine parts, and belongs to the technical field of aero-engine part machining. The cyanide-free electroplating processing technology for the aero-engine parts mainly comprises the steps of acceptance check, water agent oil removal, liquid sand blowing, 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 technology is adopted to replace cyanide silver plating, the silver plating machining technology of the wandering star gear roller bearing retainer is optimized, the phenomenon that power lines are not evenly distributed due to the special structure of parts can be improved, the problems that a silver plating layer of the roller bearing retainer is not even in thickness and poor in binding force are solved, and the service life of the roller bearing retainer is prolonged. And the quality of a silver coating of the roller bearing retainer is effectively improved, and good application and popularization effects are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft engine parts processing, and in particular, to a cyanide-free electroplating processing device for aircraft engine parts. In addition, the present application also relates to a processing method using the above-mentioned cyanide-free electroplating processing device for aircraft engine parts. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] The silver-plated layer is self-lubricating and can effectively prevent adhesion at high temperatures (below 650°C). It is often used in aircraft engine bearing components. The retainer structure of the planetary gear roller bearing is complex, with many grooves and bosses. Please refer to the attached manual for a simplified structural diagram. Figure 1 And the instruction manual Figure 2 The thickness of the conventional silver plating layer is required to be 5-8μm or 8-12μm, while the thickness of the silver layer of the planetary gear roller bearing cage is required to be 25-45μm, which is much greater than the current conventional silver plating thickness.

[0004] During the electroplating process, due to the tip effect, the electric lines tend to gather at the boss end face of the part, while the electric lines in the groove are shielded, resulting in the coating thickness of the boss end face of the part far exceeding that of the groove. In order to meet the silver layer thickness requirements of the planetary gear roller bearing retainer groove, the conventional cyanide electroplating time is about 210min to 280min. As the longer the electroplating time, the more obvious the tip effect, the rough and granular silver layer is likely to appear on the surface of the boss end face of the part, while the silver layer thickness on the groove surface is thin and the silver layer thickness distribution is uneven. At the same time, due to the ultra-thick silver plating layer, the existing cyanide electroplating processing method is difficult to ensure the bonding strength of the silver plating layer, and the pocket silver layer often falls off during the use of the engine. Please refer to the fault diagram attached to the instruction manual. Figure 2 In addition, if the oil stains on the surface of the parts are not removed before electroplating, the subsequent electroplating effect will be greatly affected. However, due to the complex structure of the planetary gear roller bearing cage, there are many grooves and bosses, and it is difficult to completely clean the oil stains on the surface of the parts.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of at least one of the above technical problems, the present application provides a cyanide-free electroplating processing device for aircraft engine parts, which can achieve sufficient cleaning of the surface of the roller bearing cage by stably clamping the roller bearing cage and spraying it with a spray component to ensure the effect of subsequent processing.

[0007] At the same time, the present application also provides a processing method using the above-mentioned cyanide-free electroplating processing device for aircraft engine parts. The method solves the problems of uneven thickness and poor bonding force of roller bearing cages with many grooves and bosses during the silver plating process, and can be extended to other parts with similar structures, shortening the silver plating processing cycle of parts and effectively improving production efficiency.

[0008] According to one aspect of the present application, a cyanide-free electroplating processing device for aircraft engine parts is provided, which is used to pretreat the surface of a roller bearing cage. The cyanide-free electroplating processing device for aircraft engine parts includes a pretreatment box, a liquid inlet pipe, a spray assembly, a bearing, an expansion sleeve, an oil storage pipe and an oil pipe:

[0009] The top of the pretreatment box is open, and a drain port is provided at the bottom of the pretreatment box. An oil storage pipe is passed through the side wall of the pretreatment box. The oil storage pipe is used to store hydraulic oil. The first end of the oil storage pipe is located in the pretreatment box and is connected to the bearing. The expansion sleeve is arranged on the outer ring of the bearing. The expansion sleeve is used to cooperate with the inner hole of the roller bearing retainer to clamp it. A pressure regulating chamber is provided in the expansion sleeve. The oil pipe is used to connect the oil storage pipe with the pressure regulating chamber. The second end of the oil storage pipe is located outside the pretreatment box and an oil inlet is provided at the second end of the oil storage pipe. A sealing member is provided in the oil inlet. A piston member is movably provided in the oil storage pipe. The sealing member is used to seal the oil inlet and pushes the piston member to compress the hydraulic oil in the oil storage pipe into the pressure regulating chamber through the oil pipe during the process of screwing into the oil inlet, thereby increasing the pressure in the pressure regulating chamber to squeeze the expansion sleeve to tighten the inner hole of the roller bearing retainer.

[0010] The liquid inlet pipe is mounted on the top of the pretreatment box, the spray assembly is mounted above the expansion sleeve, the liquid inlet pipe is connected to the spray assembly, the liquid inlet pipe is used to transport the treatment liquid to the spray assembly, and the spray assembly is used to spray the treatment liquid to rinse the surface of the roller bearing cage.

[0011] In some embodiments of the present application, the spray assembly is mounted beside the center line of the expansion sleeve so that the spray direction of the treatment liquid has an angle with the radial direction of the roller bearing retainer, thereby driving the roller bearing retainer to rotate around the axis of the bearing when spraying and flushing the roller bearing retainer.

[0012] In some embodiments of the present application, the cyanide-free electroplating processing device for aircraft engine parts also includes 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 includes a first spray pipe and a second spray pipe, the first spray pipe is used to connect with the liquid inlet pipe, the second spray pipe is a hose and is symmetrically connected to the side wall of the first spray pipe, the second spray pipes on both sides are used to spray the sides of the roller bearing retainer and the first spray pipe is used to spray the outer ring of the roller bearing retainer.

[0013] In some embodiments of the present application, the support plate assembly includes 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 to 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 be movably arranged on the support plate in a vertical direction, a fixing ring is provided on the first spray pipe, and a connecting member is provided between the fixing ring and the rotating plate, the first spray pipe is also used to lift and lower in the vertical direction to drive the rotating plate to rotate through the connecting member, thereby driving the second spray pipe to rotate synchronously to adjust the spray angle.

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

[0015] In some embodiments of the present application, a sealing plate is provided at the first end of the liquid storage tube, a compression spring is provided in the liquid storage tube, and the compression spring is pressed between the sealing plate and the piston member.

[0016] In some embodiments of the present application, a handwheel is provided at the first end of the blocking member facing the outside of the oil inlet, and a pushing member is provided at the second end of the blocking member. The first end of the pushing member is threadedly connected to the blocking member, and the second end of the pushing member is used to abut the piston member and push the piston member to move axially along the oil storage pipe.

[0017] According to another aspect of the present application, a method for cyanide-free electroplating of aircraft engine parts is also provided, which uses the above-mentioned cyanide-free electroplating device for aircraft engine parts, and comprises the following steps:

[0018] S100, clamping the roller bearing cage to the outer ring of the expansion sleeve, introducing a degreasing solution through the liquid inlet pipe, and removing the oil from the surface of the roller bearing cage through a spray assembly before taking it out;

[0019] S200, use liquid sand blasting to remove the oxide scale on the surface of the roller bearing cage;

[0020] S300, use electrolytic degreasing to clean the surface of the roller bearing cage to ensure that the surface of the parts is in good condition;

[0021] S400, use weak acid to activate the roller bearing cage;

[0022] S500, cyanide-free pre-copper plating for roller bearing cage;

[0023] S600, cyanide-free silver plating of roller bearing cages;

[0024] S700, neutralize the silver-plated roller bearing cage;

[0025] S800, the silver-plated roller bearing cage is then dehydrogenated in a vacuum furnace before final inspection.

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

[0027] In some embodiments of the present application, before step S600, the entire surface of the roller bearing retainer is pre-plated with cyanide-free silver in a charged tank at room temperature with a single current of 0.1A to 0.24A for 1 min to 2 min; in step S600, the entire surface of the roller bearing retainer is pre-plated with cyanide-free silver in a charged tank at room temperature with a single current of 0.6A to 2A for 90 min to 150 min, and the parts are turned over every 15 min to 20 min during the silver plating process to change the conductive contact parts.

[0028] This application has the following beneficial effects:

[0029] The present application discloses a cyanide-free electroplating processing device for aircraft engine parts, which inserts an expansion sleeve into the inner hole of a roller bearing cage to clamp and support the roller bearing cage. The expansion sleeve is arranged on the bearing to enable the roller bearing cage to rotate with the expansion sleeve. A pressure regulating chamber is arranged in the expansion sleeve, the bearing is connected to an oil storage pipe, a plugging member is arranged in the oil inlet of the oil storage pipe, and a piston member is movably arranged in the oil storage pipe. The oil inlet is blocked by the plugging member, and the plugging member pushes the piston member to compress the hydraulic oil in the oil storage pipe to enter the pressure regulating chamber through the oil pipe during the process of being screwed into the oil inlet, thereby increasing the pressure in the pressure regulating chamber, and finally the expansion sleeve is squeezed to tighten the inner hole of the roller bearing cage, so as to achieve the self-centering effect of the expansion sleeve and improve the stability of the clamping of the roller bearing cage. Finally, the treatment liquid is sprayed onto the surface of the roller bearing cage through the spray assembly to wash the surface. The roller bearing cage rotates around the bearing under the action of the spray impact and gravity, so as to achieve a comprehensive washing effect of the roller bearing cage, effectively improve the cleanliness of its surface, and ensure the processing effect of the subsequent treatment process.

[0030] The cyanide-free electroplating processing method for aircraft engine parts of the present application also has the above-mentioned beneficial effects. It also includes that after the roller bearing cage is effectively cleaned and oil is removed, the oxide skin on its surface is removed by liquid sand blowing, and then the surface of the roller bearing cage is cleaned by electrolytic degreasing to ensure that its surface state is good, and after it is activated by weak acid, cyanide-free pre-copper plating and cyanide-free silver plating are carried out in sequence, and finally neutralization treatment and dehydrogenation treatment are carried out, thereby effectively solving the problems of uneven thickness and poor bonding force of the roller bearing cage with more grooves and bosses during the silver plating process. The present application optimizes the silver plating processing technology of the roller bearing cage, improves the uneven distribution of electric lines caused by the special structure of the parts, solves the problems of uneven thickness and poor bonding force of the silver plating layer of the roller bearing cage, effectively improves the quality of the silver plating layer of the roller bearing cage, shortens the silver plating processing cycle of the parts, and significantly improves the production efficiency. At the same time, it can also be promoted and applied to parts with other similar structures.

[0031] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a simplified side view of the planetary gear roller bearing cage;

[0034] Figure 2 This is a schematic front view of the planetary gear roller bearing cage;

[0035] Figure 3 This is a picture of the silver layer peeling off from the pocket of the planetary gear roller bearing cage;

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

[0037] Figure 5 is a schematic diagram of the structure of a spray assembly in a preferred embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the structure of the expansion sleeve of the preferred embodiment of the present application;

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

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

[0041] Legend: 100, roller bearing cage; 1, pretreatment box; 11, drain outlet; 12, telescopic rod; 2, liquid inlet pipe; 3, spray assembly; 31, first spray pipe; 32, second spray pipe; 33, fixed ring; 34, connector; 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 chamber; 7, oil storage pipe; 71, sealing member; 72, pushing member; 73, piston member; 74, compression spring; 75, hand wheel; 8, oil pipe. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0043] Figure 1 It is a simplified side view of the planetary gear roller bearing cage; Figure 2 This is a schematic front view of the planetary gear roller bearing cage; Figure 3 This is a picture of the silver layer peeling off from the pocket of the planetary gear roller bearing cage; Figure 4 It is a structural schematic diagram of a pretreatment box of a preferred embodiment of the present application; Figure 5 is a schematic diagram of the structure of a spray assembly in a preferred embodiment of the present application; Figure 6 This is a schematic diagram of the structure of the expansion sleeve of the preferred embodiment of the present application; Figure 7 This is a schematic diagram of the structure of the oil storage pipe of the preferred embodiment of the present application; Figure 8 It is a schematic diagram of the installation of the expansion sleeve of the preferred embodiment of the present application.

[0044] A cyanide-free electroplating processing device for aircraft engine parts is used for pre-treating the surface of a roller bearing cage 100. The cyanide-free electroplating processing device for aircraft engine parts includes a pre-treatment box 1, a liquid inlet pipe 2, a spray assembly 3, a bearing 5, an expansion sleeve 6, an oil storage pipe 7 and an oil pipe 8:

[0045] The top of the pretreatment box 1 is open, and a drain port 11 is provided at the bottom of the pretreatment box 1. The oil storage pipe 7 is passed through the side wall of the pretreatment box 1. The oil storage pipe 7 is used to store hydraulic oil. The first end of the oil storage pipe 7 is located in the pretreatment box 1 and is connected to the bearing 5. The expansion sleeve 6 is sleeved on the outer ring of the bearing 5. The expansion sleeve 6 is used to cooperate with the inner hole of the roller bearing retainer 100 to clamp it. A pressure regulating chamber 64 is opened in the expansion sleeve 6. The oil pipe 8 is used to connect the oil storage pipe 7 with the pressure regulating chamber 64. The second end of the oil storage pipe 7 is located outside the pretreatment box 1 and an oil inlet is opened at the second end of the oil storage pipe 7. A plugging member 71 is arranged in the oil inlet. A piston member 73 is movably arranged in the oil storage pipe 7. The plugging member 71 is used to plug the oil inlet and push the piston member 73 to compress the hydraulic oil in the oil storage pipe 7 and enter the pressure regulating chamber 64 through the oil pipe 8 during the process of screwing into the oil inlet, thereby increasing the pressure in the pressure regulating chamber 64 to squeeze the expansion sleeve 6 to tighten the inner hole of the roller bearing retainer 100;

[0046] The liquid inlet pipe 2 is installed on the top of the pretreatment box 1, and the spray assembly 3 is installed above the expansion sleeve 6. The liquid inlet pipe 2 is connected to the spray assembly 3. The liquid inlet pipe 2 is used to transport the treatment liquid to the spray assembly 3, and the spray assembly 3 is used to spray the treatment liquid to rinse the surface of the roller bearing retainer 100.

[0047] In the present application, the expansion sleeve 6 is inserted into the inner hole of the roller bearing retainer 100 to clamp and support it. The expansion sleeve 6 is sleeved on the bearing 5 so that the roller bearing retainer 100 can rotate along with the expansion sleeve 6. A pressure regulating chamber 64 is provided in the expansion sleeve 6, the bearing 5 is connected to the oil storage pipe 7, a sealing member 71 is provided in the oil inlet of the oil storage pipe 7, and a piston member 73 is movably provided in the oil storage pipe 7. The oil inlet is blocked by the sealing member 71, and the sealing member 71 pushes the piston member 73 to compress the hydraulic oil in the oil storage pipe 7 and enter the pressure regulating chamber 64 through the oil pipe 8 during the process of being screwed into the oil inlet, thereby increasing the pressure in the pressure regulating chamber 64, and finally the expansion sleeve 6 is squeezed to tighten the inner hole of the roller bearing retainer 100, so as to achieve the self-centering effect of the expansion sleeve 6 and improve the stability of the clamping of the roller bearing retainer 100. Finally, the treatment liquid is sprayed onto the surface of the roller bearing retainer 100 through the spray assembly 3 to rinse its surface. The roller bearing retainer 100 rotates around the bearing 5 under the action of the spray impact and gravity, so as to achieve a comprehensive flushing effect of the roller bearing retainer 100, effectively improve the cleanliness of its surface, and ensure the processing effect of the subsequent treatment process.

[0048] Preferably, please refer to Figure 5As shown, the spray assembly 3 is mounted beside the center line of the expansion sleeve 6 so that the spray direction of the treatment liquid has an angle with the radial direction of the roller bearing retainer 100, so that the roller bearing retainer 100 can be driven to rotate around the axis of the bearing 5 when spraying and flushing.

[0049] It can be understood that in order to more smoothly rotate the roller bearing retainer 100 while spraying and flushing, by tilting the spray angle of the spray assembly 3, the roller bearing retainer 100 can be quickly driven to rotate during spraying and flushing, so as to achieve all-round flushing of the surface of the roller bearing retainer 100, which is beneficial to improve the cleaning effect and speed up the efficiency of the cleaning process.

[0050] Preferably, please refer to Figure 1 As shown, the cyanide-free electroplating processing device for aircraft engine parts also includes a support plate assembly 4 connected to the side wall of the pretreatment box 1, the support plate assembly 4 is used to support the limiting spray assembly 3, the spray assembly 3 includes a first spray pipe 31 and a second spray pipe 32, the first spray pipe 31 is used to communicate with the liquid inlet pipe 2, the second spray pipe 32 is a hose and is symmetrically connected to the side wall of the first spray pipe 31, the second spray pipes 32 on both sides are used to spray the side of the roller bearing retainer 100 and the first spray pipe 31 is used to spray the outer ring of the roller bearing retainer 100.

[0051] Specifically, the support plate assembly 4 includes a support plate 41 and a rotating plate 42. The support plate 41 is connected to 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 to the second spray pipe 32. 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 be movably arranged on the support plate 41 in the vertical direction. 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. The first spray pipe 31 is also used to lift and lower in the vertical direction to drive the rotating plate 42 to rotate through the connecting piece 34, thereby driving the second spray pipe 32 to rotate synchronously to adjust the spray angle.

[0052] It is understandable that the first spray pipe 31 can be raised and lowered in the vertical direction. When the first spray pipe 31 is raised, the fixing ring 33 drives the connecting piece 34 to pull the rotating plate 42 to rotate, and then the rotating plate 42 drives the second spray pipe 32 of the hose structure to rotate to adjust the spray angle, which can expand the spray range to meet the needs of surface cleaning of a larger roller bearing cage 100. On the contrary, if a smaller part to be washed is to be targeted, the first spray pipe 31 can be lowered and the second spray pipes 32 on both sides can be driven to close inward to narrow the spray range for centralized washing, which effectively improves the washing effect and adapts to the spray washing conditions of parts to be washed of different sizes.

[0053] Optionally, the connecting member 34 adopts a drawstring or an elastic band. Of course, the connecting member 34 can also adopt a rod-shaped structure, and then both ends of the connecting member 34 are hingedly connected.

[0054] Optionally, the rotating plate 42 is an L-shaped structure, the second spray pipe 32 is bound to the rotating plate 42 and the second spray pipe 32 can be bent at a certain angle through the bending portion of the rotating plate 42 for spraying and flushing, so as to accurately flush the side of the roller bearing retainer 100.

[0055] Preferably, a telescopic rod 12 is provided on the top of the pretreatment box 1, and the telescopic rod 12 is used to support the limiting liquid inlet pipe 2 and drive the liquid inlet pipe 2 and the first spray pipe 31 to rise and fall.

[0056] It is understandable that the height of the liquid inlet pipe 2 and the first spray pipe 31 can be adjusted by the telescopic rod 12, and Genori changes the overall spray coverage area of ​​the spray assembly 3 to meet the spray flushing requirements of roller bearing retainers 100 of different sizes.

[0057] Preferably, please refer to Figure 7 As shown, a sealing plate is provided at the first end of the liquid storage tube 7 , and a compression spring 74 is provided in the liquid storage tube 7 , and the compression spring 74 is compressed between the sealing plate and the piston member 73 .

[0058] It is understandable that the compression spring 74 can provide an elastic force to push the piston member 73 away from the sealing plate, thereby enabling the piston member 73 to be reset, which is beneficial for controlling the displacement of the piston member 73 and achieving precise control of the pressure in the pressure regulating chamber 64 .

[0059] Preferably, please refer to Figure 7 As shown, a hand wheel 75 is provided at the first end of the sealing member 71 facing the outside of the oil inlet, and a pushing member 72 is provided at the second end of the sealing member 71. The first end of the pushing member 72 is connected to the sealing member 71 by a thread, and the second end of the pushing member 72 is used to abut the piston member 73 and push the piston member 73 to move axially along the oil storage pipe 7.

[0060] It can be understood that the blocking member 71 can be conveniently operated by the hand wheel 75, and the pushing member 72 can achieve the effect of extending the blocking member 71, so that the blocking member 71 can smoothly push the piston member 73 to move, thereby realizing the pressure regulation of the pressure regulating chamber 64 and completing the reinforced support and limiting of the inner hole of the roller bearing retainer 100.

[0061] Optionally, the blocking member 71 is connected to the oil inlet via threads, and the pushing member 72 is a stud.

[0062] 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, the expansion sleeve inner ring 61 and the expansion sleeve outer ring 62 are enclosed to form a pressure regulating cavity 64. The expansion sleeve outer ring 62 is used to abut against the inner hole of the roller bearing cage 100.

[0063] According to another aspect of the present application, a method for cyanide-free electroplating of aircraft engine parts is also provided, which uses the above-mentioned cyanide-free electroplating device for aircraft engine parts, and comprises the following steps:

[0064] S100, clamp the roller bearing cage 100 to the outer ring of the expansion sleeve 6, introduce a degreasing solution through the liquid inlet pipe 2, remove the oil stains on the surface of the roller bearing cage 100 through the spray assembly 3, and then take it out;

[0065] S200, using liquid sand blasting to remove the oxide scale on the surface of the roller bearing cage 100;

[0066] S300, cleaning the surface of the roller bearing cage 100 by electrolytic degreasing to ensure that the surface of the parts is in good condition;

[0067] S400, using a weak acid to activate the roller bearing cage 100;

[0068] S500, performing cyanide-free pre-copper plating on the roller bearing cage 100;

[0069] S600, performing cyanide-free silver plating on the roller bearing cage 100;

[0070] S700, neutralizing the silver-plated roller bearing cage 100;

[0071] S800, the silver-plated roller bearing cage 100 is then subjected to a dehydrogenation treatment in a vacuum furnace, followed by a final inspection.

[0072] The cyanide-free electroplating processing method for aircraft engine parts of the present application also has the above-mentioned beneficial effects. It also includes that after the roller bearing cage 100 is effectively cleaned and oil-removed, the oxide skin on its surface is removed by liquid sandblasting, and then the surface of the roller bearing cage 100 is cleaned by electrolytic degreasing to ensure that its surface state is good, and after it is activated by weak acid, cyanide-free pre-copper plating and cyanide-free silver plating are performed in sequence, and finally neutralization and dehydrogenation treatment are performed, thereby effectively solving the problems of uneven thickness and poor bonding force of the roller bearing cage 100 with more grooves and bosses during the silver plating process. The present application optimizes the silver plating processing technology of the roller bearing cage 100, improves the uneven distribution of electric lines caused by the special structure of the parts, solves the problems of uneven thickness and poor bonding force of the silver plating layer of the roller bearing cage 100, effectively improves the quality of the silver plating layer of the roller bearing cage 100, shortens the silver plating processing cycle of the parts, and significantly improves the production efficiency. At the same time, it can also be promoted and applied to parts with similar structures.

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

[0074] It is understandable that the liquid sandblasting process can effectively remove the oxide skin on the surface of the roller bearing cage 100, ensure the effect of the subsequent cyanide-free silver plating, and avoid problems such as uneven thickness and poor bonding during the silver plating process. The pretreatment of the surface of the roller bearing cage 100 with cyanide-free pre-copper plating can facilitate the subsequent cyanide-free silver plating to smoothly adhere to the surface of the roller bearing cage 100 to form a silver plating layer, improve the bonding force of the silver plating layer, and avoid the parts from easily falling off when in use.

[0075] Preferably, before step S600, the entire surface of the roller bearing retainer 100 is pre-plated with cyanide-free silver in an electrified tank at room temperature with a single-piece current of 0.1A to 0.24A for 1 min to 2 min; in step S600, the entire surface of the roller bearing retainer 100 is pre-plated with cyanide-free silver in an electrified tank at room temperature with a single-piece current of 0.6A to 2A for 90 min to 150 min, and the parts are turned over every 15 min to 20 min during the silver plating process to change the conductive contact position.

[0076] It can be understood that the present application effectively reduces the electroplating time, reduces the tip effect, and avoids the phenomenon that the silver layer on the end face of the part boss is rough and granular, while the silver layer on the groove surface is thin and the silver layer thickness is unevenly distributed.

[0077] In summary, the present application adopts a cyanide-free silver plating process to replace cyanide silver plating, and optimizes the silver plating process of the roller bearing cage 100. The main processes are: acceptance → water-based degreasing → liquid sand blowing → electrolytic degreasing → weak corrosion → cyanide-free pre-copper plating → cyanide-free pre-silver plating → cyanide-free silver plating → neutralization → dehydrogenation → inspection. It improves the uneven distribution of electric lines caused by the special structure of the parts, solves the problems of uneven thickness and poor bonding of the silver plating layer of the roller bearing cage 100, effectively improves the quality of the silver plating layer of the roller bearing cage 100, and has a good promotion and application effect.

[0078] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0079] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A cyanide-free electroplating processing device for aircraft engine parts, used for pre-treating 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 spray assembly (3), a bearing (5), an expansion sleeve (6), an oil storage pipe (7) and an oil passage pipe (8): The top of the pretreatment box (1) is open, and the bottom of the pretreatment box (1) is provided with a sewage outlet (11). An oil storage pipe (7) is arranged on the side wall of the pretreatment box (1), and the oil storage pipe (7) is used to store hydraulic oil. The first end of the oil storage pipe (7) is located in the pretreatment box (1) and is connected to the bearing (5). The expansion sleeve (6) is sleeved on the outer ring of the bearing (5), and the expansion sleeve (6) is used to cooperate with the inner hole of the roller bearing retainer (100) to clamp it. A pressure regulating chamber (64) is opened in the expansion sleeve (6), and the oil pipe (8) is used to connect the oil storage pipe (7) with the pressure regulating chamber (64). 4) connected, 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, a plugging member (71) is arranged in the oil inlet, a piston member (73) is movably arranged in the oil storage pipe (7), the plugging member (71) is used to plug the oil inlet and in the process of being screwed into the oil inlet, the piston member (73) is pushed to compress the hydraulic oil in the oil storage pipe (7) through the oil pipe (8) into the pressure regulating chamber (64), thereby increasing the pressure in the pressure regulating chamber (64) to squeeze the expansion sleeve (6) to tighten the inner hole of the roller bearing retainer (100); The liquid inlet pipe (2) is mounted on the top of the pretreatment box (1), the spray assembly (3) is mounted above the expansion sleeve (6), the liquid inlet pipe (2) is connected to the spray assembly (3), the liquid inlet pipe (2) is used to transport the treatment liquid to the spray assembly (3), and the spray assembly (3) is used to spray the treatment liquid to flush the surface of the roller bearing retainer (100).

2. The cyanide-free electroplating processing device for aircraft engine parts according to claim 1, characterized in that: The spray assembly (3) is mounted beside the center line of the expansion sleeve (6) so that the spray direction of the treatment liquid forms an angle with the radial direction of the roller bearing retainer (100), thereby driving the roller bearing retainer (100) to rotate around the axis of the bearing (5) when spraying and flushing the roller bearing retainer (100).

3. The cyanide-free electroplating processing device for aircraft engine parts according to claim 1 or 2, characterized in that: The cyanide-free electroplating processing device for aircraft engine parts also includes a support plate assembly (4) connected to the side wall of the pretreatment box (1), the support plate assembly (4) is used to support the limit spray assembly (3), the spray assembly (3) includes a first spray pipe (31) and a second spray pipe (32), the first spray pipe (31) is used to communicate with the liquid inlet pipe (2), the second spray pipe (32) is a hose and is symmetrically connected to the side wall of the first spray pipe (31), the second spray pipes (32) on both sides are used to spray the side of the roller bearing retainer (100) and the first spray pipe (31) is used to spray the outer ring of the roller bearing retainer (100).

4. The cyanide-free electroplating processing device for aircraft engine parts according to claim 3 is characterized in that: The support plate assembly (4) comprises a support plate (41) and a rotating plate (42). The support plate (41) is connected to 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 to the second spray pipe (32). 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 be movably arranged on the support plate (41) in a vertical direction. 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). The first spray pipe (31) is also used to be lifted and lowered in a vertical direction to drive the rotating plate (42) to rotate through the connecting piece (34), thereby driving the second spray pipe (32) to rotate synchronously to adjust the spray angle.

5. The cyanide-free electroplating processing device for aircraft engine parts according to claim 4, characterized in that: A telescopic rod (12) is arranged on the top of the pretreatment box (1), and the telescopic rod (12) is used to support the limited liquid inlet pipe (2) and drive the liquid inlet pipe (2) and the first spray pipe (31) to rise and fall.

6. The cyanide-free electroplating processing device for aircraft engine parts according to claim 1, characterized in that: A sealing plate is provided at the first end of the liquid storage tube (7), and a compression spring (74) is provided in the liquid storage tube (7), wherein the compression spring (74) is pressed between the sealing plate and the piston member (73).

7. The cyanide-free electroplating processing device for aircraft engine parts according to claim 1, characterized in that: A hand wheel (75) is provided at the first end of the sealing member (71) facing the outside of the oil inlet, and a pushing member (72) is provided at the second end of the sealing member (71). The first end of the pushing member (72) is connected to the sealing member (71) by a thread, and the second end of the pushing member (72) is used to abut against the piston member (73) and push the piston member (73) to move axially along the oil storage pipe (7).

8. A cyanide-free electroplating method for aircraft engine parts, characterized in that: Using the cyanide-free electroplating processing device for aircraft engine parts according to any one of claims 1 to 7, the cyanide-free electroplating processing method for aircraft engine parts comprises the following steps: S100, clamping the roller bearing cage (100) to the outer ring of the expansion sleeve (6), introducing a degreasing solution through the liquid inlet pipe (2), and removing the oil from the surface of the roller bearing cage (100) through the spray assembly (3) before taking it out; S200, using liquid sandblasting to remove the oxide scale on the surface of the roller bearing cage (100); S300, using electrolytic degreasing to clean the surface of the roller bearing cage (100) to ensure that the surface of the parts is in good condition; S400, using a weak acid to activate the roller bearing cage (100); S500, performing cyanide-free pre-copper plating on the roller bearing cage (100); S600, performing cyanide-free silver plating on the roller bearing cage (100); S700, neutralizing the silver-plated roller bearing cage (100); S800, the silver-plated roller bearing cage (100) is then subjected to a dehydrogenation treatment in a vacuum furnace, followed by a final inspection.

9. The method for cyanide-free electroplating of aircraft engine parts according to claim 8, characterized in that: In step S200, the entire surface of the roller bearing retainer (100) is uniformly wet-blown with corundum sand, the sand particle size is 200 mesh to 240 mesh, the pressure is 0.4MPa to 0.6MPa, and the surface color of the parts after sand blowing should be uniform; in step S500, the entire surface of the roller bearing retainer (100) is pre-plated with copper without cyanide, the solution temperature is 50°C ± 10°C, the single-piece current is 1A to 3A, and the time is 3min to 5min.

10. The cyanide-free electroplating method for aircraft engine parts according to claim 8, characterized in that: Before step S600, the entire surface of the roller bearing retainer (100) is pre-plated with cyanide-free silver, and the tank is charged at room temperature. The current of each piece is 0.1A to 0.24A, and the time is 1 minute to 2 minutes. In step S600, the entire surface of the roller bearing retainer (100) is pre-plated with cyanide-free silver, and the tank is charged at room temperature. The current of each piece is 0.6A to 2A, and the silver plating time is 90 minutes to 150 minutes. During the silver plating process, the parts are turned over once every 15 minutes to 20 minutes to change the conductive contact position.

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