Glue joint device and glue joint method for torsion arm and square arm assembly of helicopter

Abstract

The invention provides a helicopter torque arm square arm assembly gluing device and method.The device comprises a base 1, a supporting plate 2, a positioning bush 3, a pressing bush 4, a pressing nut 5, a pressing bolt 6, a first sealing gasket 7, a second sealing gasket 8, a gluing core rod 9 and a torque arm square arm assembly 10, and the shape of the base 1 is matched with the structure of the torque arm square arm assembly; n threaded holes are machined in the bottom plate and used for installing supporting columns, N unthreaded holes and N threaded holes are machined in wall plates on the two sides of the base 1, the N unthreaded holes are used for installing positioning bushings 3, and the N threaded holes are used for installing positioning bush fixing screws and preventing the positioning bushings 3 from rotating and moving. The supporting plate 2 is placed on the base 1, the shape of the supporting plate 2 is arranged according to the structure of a square arm assembly of the torque arm, and a rubber pad is bonded to the supporting plate 2. The N positioning bushings 3 are installed on the base 1 in an interference fit mode.

Description

Technical Field

[0001] The invention belongs to the technical field of helicopter assembly, and in particular relates to a helicopter torque arm square arm assembly gluing device and a gluing method. Background Art

[0002] The torque arm square arm assembly is a key component in the helicopter automatic tilt device. Its main function is to drive the dynamic ring and the main shaft to rotate synchronously.

[0003] like Figure 1 As shown in the figure, the torque arm square arm assembly consists of a torque arm square arm and a tungsten carbide shoulder bushing, which is a hole-shaft matching pair. Since the service life of the tungsten carbide shoulder bushing is shorter than that of the torque arm square arm, in order to facilitate the replacement of the tungsten carbide shoulder bushing after its service life, the design uses J-200-1A glue to glue the tungsten carbide shoulder bushing to the inner hole of the square arm. After gluing, it is necessary to ensure Figure 1 The relevant linear dimensions and geometric tolerance requirements in the bonding process of tungsten carbide shoulder bushings are currently completed manually. In order to ensure the size requirements, repeated measurements and adjustments are required, and the labor intensity of the operators is high. Due to the unclear description of the process documents, the operation methods are not detailed, and the control requirements are not clear, at the same time, the bonding process design does not take into account the actual situation that the glue will overflow from the bonding surface, and the bonding tooling used does not take effective measures to prevent the flow of the glue. The glue will overflow along the bonding surface during the pre-curing period, and the overflow amount will vary due to various factors such as gel time and operation techniques, resulting in a large dispersion of the actual bonding strength of the adhesive layer. In summary, the performance indicators of different batches of products fluctuate greatly, the stability and consistency of product quality are not high, the bonding performance of individual products is poor, and the actual bonding force cannot meet the use requirements, which eventually leads to the debonding problem of the tungsten carbide shoulder bushing. When the adhesive layer is completely debonded and peeling occurs, the tungsten carbide shoulder bushing is in direct contact with the square arm hole of the torque arm and is repeatedly worn and damaged, which may affect the flight safety of the helicopter. Summary of the invention

[0004] The present application provides a helicopter torque arm square arm assembly gluing device, which can solve the problem of low stability and consistency of product quality.

[0005] First invention, the present application provides a helicopter torque arm square arm assembly bonding device, the device includes a base 1, a support plate 2, a positioning bushing 3, a clamping bushing 4, a clamping nut 5, a clamping bolt 6, a first sealing gasket 7, a second sealing gasket 8, a bonding mandrel 9, and a torque arm square arm assembly 10, wherein:

[0006] The appearance of the base 1 matches the structure of the torque arm square arm assembly. N threaded holes are processed on the bottom plate for installing the support column. N light holes and N threaded holes are processed on the side wall panels of the base 1. The N light holes are used to install the positioning bushing 3, and the N threaded holes are used to install the positioning bushing fixing screws to prevent the positioning bushing 3 from rotating and moving; the support plate 2 is placed on the base 1, and the appearance of the support plate 2 is set according to the structure of the torque arm square arm assembly, and a rubber pad is bonded to the support plate 2; there are N positioning bushings 3, which are installed on the base 1 by interference fit. The outer diameter of the positioning bushing 3 is set according to the size and interference of the N light holes on the side wall panels of the base 1; the clamping bushing 4 is strung on the adhesive mandrel 9, the small end of the clamping bushing 4 is fitted with the non-shoulder of the tungsten carbide shoulder bushing, the large end of the clamping bushing 4 is fitted with the clamping nut 5, and the inner diameter of the clamping bushing 4 is set according to the inner hole size of the positioning bushing 3; the clamping nut 5 is strung on the adhesive mandrel 9, and the outer side of the clamping nut 5 is processed Hexagonal, with a stepped hole processed on the inside, the small end of the clamping nut 5 is a smooth hole, the large end of the clamping nut 5 is a threaded hole, the small end fits with the positioning bushing 3, and the large end is connected with the clamping bolt 6 through a thread. The size of the smooth hole of the clamping nut 5 is set according to the inner hole size of the positioning bushing 3; the clamping bolt 6 is strung on the adhesive mandrel 9, and the outer side of the clamping bolt 6 is processed with a hexagonal shape for easy twisting. One end of the clamping bolt 6 is installed on the clamping nut 5 through a thread, and one end of the clamping bolt 6 is non-threaded with the tungsten carbide shoulder bushing The shoulder fits, and the inner diameter of the tightening bolt 6 is set according to the inner hole size of the positioning bushing 3; the inner hole size of the first sealing gasket 7 is set according to the outer circle size of the non-shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle, and the inner hole size of the second sealing gasket 8 is set according to the outer circle size of the non-shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle; the length of the adhesive mandrel 9 is longer than the distance between the two side wall panels on the base 1, and the diameter of the adhesive mandrel 9 is selected according to the inner diameter of the tungsten carbide shoulder bushing.

[0007] Specifically, after the positioning bushing 3 is assembled, the inner hole and the end surface of the positioning bushing 3 are subjected to secondary processing, and the linear dimensions and form and position tolerances after the secondary processing are three times the requirements of the torque arm square arm assembly.

[0008] Specifically, the pressing bushing 4 is 0.05-0.1 mm larger than the inner hole of the positioning bushing 3 .

[0009] Specifically, the size of the aperture of the clamping nut 5 is 0.05-0.1 mm larger than the inner hole of the positioning bushing 3 .

[0010] Specifically, the inner diameter of the clamping bolt 6 is 0.05-0.1 mm larger than the inner hole size of the positioning bushing 3 .

[0011] Specifically, the difference between the diameter of the adhesive core rod 9 and the inner diameter of the tungsten carbide shoulder bushing is no more than 0.01 mm.

[0012] Specifically, four light holes and four threaded holes are processed on the side wall panels of the base 1 . The four light holes are used to install the positioning bushings 3 . There are four positioning bushings 3 in total.

[0013] The second invention, the present application provides a method for gluing a helicopter torque arm square arm assembly, the method comprising:

[0014] Step 1: Initially install the tungsten carbide shoulder bushing onto the square arm of the torque arm;

[0015] Step 2: Install the first sealing ring 7 and the second sealing ring 8 on both sides of the tungsten carbide shoulder bushing to complete the pre-assembly of the torque arm square arm assembly;

[0016] Step 3: Place the pre-assembled torque arm square arm assembly on the support plate 2, adjust the position of the torque arm square arm assembly by compressing the rubber pad, ensure that the torque arm square arm assembly hole is aligned with the hole on the positioning bushing 3, and then insert the adhesive mandrel 9 into the torque arm square arm assembly hole and the hole on the positioning bushing 3;

[0017] Step 4: Use a wrench to rotate the clamping nut 5 in the tightening direction. The rotation of the clamping nut 5 will drive the clamping bushing 4 to tighten the torque arm square arm assembly 10 until the outer end surface of the tungsten carbide boss bushing of the torque arm square arm assembly 10 fits with the positioning bushing 3;

[0018] Step 5: Place the torque arm square arm assembly 10 and the bonding device in a high temperature box to cure the glue.

[0019] In summary, the present application provides a gluing device for a helicopter torque arm square arm assembly. The device has a simple operation process, can reduce the difficulty of assembly, does not require adjustment after assembly, can quickly ensure the linear size and form and position tolerance requirements of the torque arm square arm assembly, and at the same time, seals the gluing surface of the torque arm square arm assembly through a sealing ring to solve the problem of J-200-1A glue overflowing along the gluing surface during the curing process, improves the uniformity of the glue layer thickness, thereby improving the bonding strength and stability, and avoiding the problem of debonding of the tungsten carbide shoulder bushing during flight use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a square arm assembly of a helicopter torque arm;

[0021] Figure 2 A front view of a helicopter torque arm square arm assembly bonding device provided in the present application;

[0022] Figure 3 A top view of a helicopter torque arm square arm assembly bonding device provided in the present application;

[0023] Figure 4A top view of a base 1 of a helicopter torque arm square arm assembly bonding device provided in the present application;

[0024] Figure 5 A schematic diagram of the selection of a square arm assembly for a helicopter torque arm square arm assembly bonding method provided in the present application;

[0025] Figure 6 The installation position of the sealing ring of the square arm assembly of the helicopter torque arm square arm assembly bonding method provided by the present application;

[0026] Figure 7 The first step of installing a square arm assembly of a helicopter torque arm square arm assembly bonding method provided in the present application;

[0027] Figure 8 The second step of installing the square arm assembly of the helicopter torque arm square arm assembly bonding method provided by the present application;

[0028] Fig. 9 The third step of installing the square arm assembly of the helicopter torque arm square arm assembly bonding method provided by the present application;

[0029] Among them, 1-base, 2-support plate, 3-positioning bushing, 4-compression bushing, 5-compression nut, 6-compression bolt, 7-first sealing gasket, 8-second sealing gasket, 9-adhesive core rod, 10-torque arm square arm assembly. DETAILED DESCRIPTION

[0030] Embodiment 1

[0031] like Figure 2-3 As shown, the present application provides a helicopter torque arm square arm assembly gluing quick positioning device, which can avoid the overflow problem of J-200-1A glue during the curing process, including a base 1, a support plate 2, a positioning bushing 3, a clamping bushing 4, a clamping nut 5, a clamping bolt 6, a first sealing gasket 7, a second sealing gasket 8, a gluing mandrel 9, and a torque arm square arm assembly 10, wherein:

[0032] The appearance of the base 1 matches the structure of the square arm assembly of the torque arm. N threaded holes are processed on the bottom plate for installing the support column, so that the support column can be disassembled and replaced, which is convenient for the handling and maintenance of the adhesive joint device. N light holes and N threaded holes are processed on the wall panels on both sides of the base 1. The N light holes are used to install the positioning bushing 3, and the N threaded holes are used to install the positioning bushing fixing screws to prevent the positioning bushing 3 from rotating and moving; the support plate 2 is placed on the base 1, and the appearance of the support plate 2 is set according to the structure of the square arm assembly of the torque arm. The support plate 2 is bonded with a rubber pad to prevent the torque arm square arm assembly from contacting the metal and causing scratches; there are N locating bushings 3, which are installed on the base 1 by interference fit. The outer diameter of the locating bushing 3 is set according to the size and interference of the N light holes on the wall panels on both sides of the base 1; the clamping bushing 4 is strung on the adhesive mandrel 9, the small end of the clamping bushing 4 fits with the non-convex shoulder of the tungsten carbide shoulder bushing, and the large end of the clamping bushing 4 fits with the clamping nut 5. The inner diameter of the clamping bushing 4 is set according to the inner hole size of the locating bushing 3; the clamping nut 5 is strung on the adhesive mandrel 9, the outer side of the clamping nut 5 is processed with a hexagonal shape for easy twisting, and a stepped hole is processed on the inner side. The small end of the clamping nut 5 is a smooth hole, and the large end of the clamping nut 5 is a threaded hole. The small end fits with the positioning bushing 3, and the large end is connected with the clamping bolt 6 through a thread. The size of the smooth hole of the clamping nut 5 is set according to the inner hole size of the positioning bushing 3; the clamping bolt 6 is strung on the adhesive mandrel 9, and the outer side of the clamping bolt 6 is processed with a hexagonal shape for easy twisting. One end of the clamping bolt 6 is installed on the clamping nut 5 through a thread. 6 one end is fitted with the non-convex shoulder of the tungsten carbide shoulder bushing, the inner diameter size of the clamping bolt 6 is set according to the inner hole size of the positioning bushing 3; the inner hole size of the first sealing gasket 7 is set according to the outer circle size of the non-convex shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle, the inner hole size of the second sealing gasket 8 is set according to the outer circle size of the non-convex shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle; the length of the adhesive mandrel 9 is longer than the distance between the two side wall panels on the base 1, and the diameter size of the adhesive mandrel 9 is selected according to the inner diameter of the tungsten carbide shoulder bushing.

[0033] Specifically, after the positioning bushing 3 is assembled, the inner hole and the end surface of the positioning bushing 3 are subjected to secondary processing. The linear dimensions and geometric tolerances after the secondary processing are three times the requirements of the torque arm square arm assembly, such as Figure 4 shown.

[0034] Specifically, the pressing bushing 4 is 0.05-0.1 mm larger than the inner hole of the positioning bushing 3 .

[0035] Specifically, the size of the aperture of the clamping nut 5 is 0.05-0.1 mm larger than the inner hole of the positioning bushing 3 .

[0036] Specifically, the inner diameter of the clamping bolt 6 is 0.05-0.1 mm larger than the inner hole size of the positioning bushing 3 .

[0037] Specifically, the difference between the diameter of the adhesive core rod 9 and the inner diameter of the tungsten carbide shoulder bushing is no more than 0.01 mm.

[0038] Specifically, four light holes and four threaded holes are processed on the side wall panels of the base 1 , and the four light holes are used to install the positioning bushings 3 .

[0039] Specifically, there are four positioning bushings 3 in total.

[0040] In summary, the present application provides a gluing device for a helicopter torque arm square arm assembly. The device has a simple operation process, can reduce the difficulty of assembly, does not require adjustment after assembly, can quickly ensure the linear size and form and position tolerance requirements of the torque arm square arm assembly, and at the same time, seals the gluing surface of the torque arm square arm assembly through a sealing ring to solve the problem of J-200-1A glue overflowing along the gluing surface during the curing process, improves the uniformity of the glue layer thickness, thereby improving the bonding strength and stability, and avoiding the problem of debonding of the tungsten carbide shoulder bushing during flight use.

[0041] Embodiment 2

[0042] The present application provides a method for gluing a helicopter torque arm square arm assembly gluing device, comprising:

[0043] Step 1: Initially install the tungsten carbide shoulder bushing onto the square arm of the torque arm;

[0044] Step 2: Install the first sealing ring 7 and the second sealing ring 8 on both sides of the tungsten carbide shoulder bushing to complete the pre-assembly of the torque arm square arm assembly;

[0045] Step 3: Place the pre-assembled torque arm square arm assembly on the support plate 2, adjust the position of the torque arm square arm assembly by compressing the rubber pad, ensure that the torque arm square arm assembly hole is aligned with the hole on the positioning bushing 3, and then insert the adhesive mandrel 9 into the torque arm square arm assembly hole and the hole on the positioning bushing 3 to ensure Figure 1 The requirements of 230±0.2, parallelism φ0.1 and coaxiality φ0.015;

[0046] Step 4: Use a wrench to rotate the compression nut 5 in the tightening direction. The rotation of the compression nut 5 will drive the compression bushing 4 to compress the torque arm square arm assembly 10 until the outer end surface of the tungsten carbide boss bushing of the torque arm square arm assembly 10 fits with the positioning bushing 3 to ensure Figure 1 137.50 -0.1 size requirement;

[0047] Step 5: Place the torque arm square arm assembly 10 and the bonding device in a high temperature box to cure the glue.

[0048] Embodiment 3

[0049] The present application embodiment provides a helicopter torque arm square arm assembly gluing method, which is implemented by using a helicopter torque arm square arm assembly gluing device provided in the above embodiment, and the method includes:

[0050] Step 1: Check the adhesive surface of the bushing mounting hole surface of the torque arm square arm and the surface of the tungsten carbide boss bushing;

[0051] Specifically, check that the anodized layer on the surface of the mounting hole of the torque arm square arm bushing should be continuous, smooth and uniform, and should not have scratches, deep scratches, burns or leaking anodized areas; check that the surface of the tungsten carbide shoulder bushing should be free of knocks, scratches and rust.

[0052] Step 2: Group the tungsten carbide shoulder bushings and select the corresponding adhesive mandrel according to the inner diameter of the tungsten carbide shoulder bushings;

[0053] Specifically, step 2 includes:

[0054] Step 21: Figure 5 As shown, bushing A and bushing B are a group, and the actual aperture difference between the two bushings is no more than 0.005mm;

[0055] Step 22: Figure 5 As shown, bushing C and bushing D are a group, and the actual aperture difference between the two bushings is no more than 0.005mm;

[0056] Step 23: After determining the actual A, B, C, and D bushings, record the measured values ​​of the bushing inner diameters, the difference values ​​of the bushing inner diameters, and the maximum inner diameter values ​​in Table 1, and mark the grouped bushings using the bagging method.

[0057] Table 1 Tungsten carbide shoulder bushing and adhesive mandrel selection record

[0058]

[0059] Step 24: Select the gluing mandrel according to the maximum inner diameter of bushing A and bushing B. The difference between the diameter of the gluing mandrel and the maximum inner diameter of bushings A and B is no more than 0.01 mm. Select the mandrel that matches bushings C and D in the same way. After selection, record the measured value of the mandrel outer diameter and the maximum clearance value between the mandrel and the inner hole of the shoulder bushing in Table 1.

[0060] Step 25: Select a good core rod and mark AB and CD respectively with a marker pen according to the matching tungsten carbide shoulder bushing.

[0061] Step 26: Compare the selected adhesive mandrel with the hole on the adhesive device to ensure that the adhesive mandrel can pass freely without getting stuck. Mark the grouped tungsten carbide shoulder bushings and corresponding adhesive mandrels as a group and place them properly for subsequent assembly of the same fork double hole.

[0062] Step 3: Clean the inner surface of the torque arm square arm bushing installation hole and the outer surface of the tungsten carbide shoulder bushing;

[0063] Specifically, step 3 includes:

[0064] Step 31: Clean the surface of the bonding device. Use 180# gasoline to clean the entire surface of the bonding device. After cleaning, use white non-woven cloth to wipe the joint between the device and the workpiece until the white non-woven cloth has no color change.

[0065] Step 32: Clean the entire surface of the parts. Use 180# gasoline to clean the entire surface of the torque arm square arm and tungsten carbide shoulder bushing. After cleaning, wipe it clean with a white non-woven cloth and let it dry for 5 minutes.

[0066] Step 33: Clean the bonding surface. Use cotton wool dipped in acetone to wipe the inner surface of the torque arm square arm mating hole until there is no dirt on the cotton wool, and let it dry at room temperature for more than 15 minutes. Use a clean white rag dipped in acetone to wipe the outer surface of the tungsten carbide shoulder bushing until there is no color change on the rag, and let it dry for 5 minutes.

[0067] It should be noted that the work platform should be covered with wax-free and oil-free kraft paper before cleaning, and the operator should wear latex gloves during the cleaning process.

[0068] Step 4: Adjust the -200-1A glue

[0069] Specifically, step 4 includes:

[0070] Step 41: Assess the demand for glue in actual production tasks, and use J-200-1A glue according to the ratio requirements in Table 2. Check that the surface colors of component A and component B are uniform, there is no agglomeration, and there is no foreign matter.

[0071] Table 2J-200-1A glue color and ratio information

[0072] Serial number Components color Ratio (mass ratio) 1 Component A Light yellow 10 2 Component B Brownish red 3

[0073] Step 42: Weigh the received component A and component B, calculate the ratio of component A to component B, and record the result.

[0074] Step 43: Use a glue stick with a clean surface to stir the adhesive in the plastic cup at a constant speed from the outside to the inside in the same direction until the adhesive is evenly mixed and the surface color is consistent. There should be no obvious bubbles on the surface of the mixed glue, and record the end time of the glue mixing.

[0075] It should be noted that the mixing time for glue mixing needs to be more than 5 minutes. Since the J-200-1A glue gels quickly at high temperatures, in order to ensure sufficient construction time, the bonding environment temperature is controlled at 15℃-25℃, and the subsequent glue coating and tungsten carbide shoulder bushing installation work must be completed within 30 minutes.

[0076] Step 5: Apply glue to the inner surface of the torque arm square arm bushing installation hole and the outer surface of the tungsten carbide shoulder bushing

[0077] Dip a paintbrush into the prepared glue and evenly apply it on the inner surface of the square arm of the torque arm and the outer surface of the tungsten carbide shoulder bushing. There should be no bubbles in the glue layer after coating.

[0078] Step 6: Install the Tungsten Carbide Shoulder Bushing onto the Torque Arm Square Arm

[0079] Specifically, step 6 includes:

[0080] Step 61: Place the tungsten carbide shoulder bushing facing the square arm mounting hole of the torque arm, and initially insert it into the square arm hole of the torque arm, and then rotate it in the same direction to evenly distribute the glue in the gap area between the square arm and the shoulder bushing and remove the air until the end face of the shoulder bushing fits the surface of the square arm. After the shoulder bushing is installed, check that the glue should evenly overflow on the shoulder end of the bushing and the area where the bushing is exposed to the bottom hole of the square arm, and there should be no obvious bubbles on the surface of the overflowed glue.

[0081] Step 62: Figure 6 As shown, the first sealing gasket 7 is installed at the outer circle of the bushing boss and the square arm at 12, 13, 16 and 17 respectively. The sealing gasket should be flat after installation and there should be no gap between it and the contact surface of the square arm. After the adhesive gasket is installed, the excess adhesive layer outside the rubber ring is removed.

[0082] Step 63: Figure 6 As shown, the second sealing gasket 8 is installed at the outer circle of the bushing boss and the square arm at 11, 14, 15 and 18 respectively. The sealing gasket should be flat after installation and there should be no gap between it and the contact surface of the square arm. After the adhesive gasket is installed, the excess adhesive layer outside the rubber ring is removed.

[0083] Step 7: Install the torque arm square arm assembly onto the bonding device and place it in a high temperature box for heating and curing;

[0084] Specifically, step 7 includes:

[0085] Step 71: First place the support plate 2 on the base 1, then place the torque arm square arm assembly 10 on the support plate 2, and adjust the position of the torque arm square arm assembly 10 on the support plate 2 to ensure that Figure 5 The inner hole of the tungsten carbide boss bushing at A is aligned with the inner hole of the positioning bushing 3.

[0086] Step 72: Figure 7-9 As shown, the adhesive mandrel 9 is inserted into Figure 5 The inner hole of the tungsten carbide shoulder bushing at A in the middle reaches Figure 7 State; sequentially insert the clamping bolt 6, the clamping nut 5, and the clamping bushing 4 into the adhesive mandrel 9 to achieve Figure 8 State; align the inner hole of the tungsten carbide shoulder bushing at B with the inner hole of the positioning bushing 3, and insert the adhesive mandrel into the inner hole of the shoulder bushing at B to achieve Fig. 9 State, complete the installation of one side of the torque arm square arm assembly 10. According to the above steps, complete the installation of the other side of the torque arm square arm assembly 10.

[0087] Step 73: Use a wrench to slowly rotate the tightening nut 5 in the direction of tightening the tungsten carbide shoulder bushing, so that the outer end face of the tungsten carbide shoulder bushing of the torque arm square arm assembly 10 fits with the positioning bushing 3. After the force is applied, check whether the first sealing gasket 7 and the second sealing gasket 8 fit with the contact surface of the torque arm square arm. If there is a gap, fine-tune the first sealing gasket 7 and the second sealing gasket 8 to ensure that there is no gap with the contact surface of the torque arm square arm.

[0088] Step 74: Place the installed torque arm square arm assembly 10 and the bonding device into a high temperature box, heat it to 65°C at a heating rate of no more than 4°C / Min, and keep it warm for more than 1 hour to solidify the glue. The curing process is recorded in Table 4.

[0089] Table 4 Curing process record

[0090]

[0091] Step 75: After curing is completed, take out the torque arm square arm assembly 10 and the bonding device from the high temperature box, loosen the clamping nut 5, remove the adhesive core rod 9, take out the clamping bushing 4, the clamping bolt 6, and the clamping nut 5 in turn, and take out the torque arm square arm assembly 10 from the bonding device.

[0092] Step 76: Use a spatula to disassemble the first sealing gasket 7 and the second sealing gasket 8 from the torque arm square arm assembly 10, and visually inspect the glue layer at the bonding location. There should be no discoloration, uneven color, cracks, debris or bubbles.

[0093] It should be noted that, during the process of disassembling the first sealing gasket 7 and the second sealing gasket 8, the scraper is prohibited from touching the tungsten carbide shoulder bushing and the surface of the square arm of the torque arm.

[0094] Step 77: Clean the surface of the torque arm square arm assembly 10 and the bonding device with a clean white non-woven cloth until there is no color change on the white non-woven cloth. The bonding device accessories are installed on the base 1 for subsequent use.

[0095] Step 8: Check the linear dimensions and geometric tolerances of the torque arm square arm assembly, and check the bonding strength of the tungsten carbide shoulder bushing;

[0096] Specifically, step 8 includes:

[0097] Step 81: Use relevant inspection tools to inspect Figure 1 Whether the linear dimensions and geometric tolerances meet the requirements.

[0098] Step 82: Place the torque square arm assembly on a press and apply a downward load at a speed of 2 mm / min to detect whether the bonding force of the tungsten carbide boss bushing meets the design index requirements.

[0099] The present application proposes a bonding device which is simple to operate and can quickly ensure the linear dimension and form and position tolerance requirements after assembly, and can effectively solve the problem of J-200-1A glue overflowing along the bonding surface during pre-curing. The assembly quality is stable and reliable, and it is suitable for the bonding device of the hole-axis matching pair of the helicopter torque arm square arm assembly; formulates the operating specifications for the bonding of the tungsten carbide shoulder bushing of the torque arm square arm assembly, stipulates the relevant requirements such as raw material control, process control and quality control in the bonding process of the tungsten carbide shoulder bushing of the torque arm square arm assembly, and forms a bonding process method for the tungsten carbide shoulder bushing of the helicopter torque arm square arm assembly.

Claims

1. A helicopter torque arm square arm assembly bonding device, characterized in that: The device comprises a base (1), a support plate (2), a positioning bushing (3), a clamping bushing (4), a clamping nut (5), a clamping bolt (6), a first sealing gasket (7), a second sealing gasket (8), an adhesive mandrel (9), and a torque arm square arm assembly (10), wherein: The appearance of the base (1) matches the structure of the square arm assembly of the torque arm. N threaded holes are processed on the bottom plate for installing the support column. N light holes and N threaded holes are processed on the side wall plates of the base (1). The N light holes are used to install the positioning bushing (3). The N threaded holes are used to install the positioning bushing fixing screws to prevent the positioning bushing (3) from rotating and moving. The support plate (2) is placed on the base (1). The appearance of the support plate (2) is set according to the structure of the square arm assembly of the torque arm. A rubber pad is bonded to the support plate (2). The positioning bushing (3) There are N of them, which are installed on the base (1) by interference fit. The outer diameter of the positioning bushing (3) is set according to the size and interference of the N light holes on the side wall panels of the base (1); the clamping bushing (4) is strung on the adhesive mandrel (9), the small end of the clamping bushing (4) fits with the non-convex shoulder of the tungsten carbide shoulder bushing, the large end of the clamping bushing (4) fits with the clamping nut (5), and the inner diameter of the clamping bushing (4) is set according to the inner hole size of the positioning bushing (3); the clamping nut (5) is strung on the adhesive mandrel (9), and the outer side of the clamping nut (5) is A hexagonal hole is machined, and a stepped hole is machined on the inner side. The small end of the clamping nut (5) is a smooth hole, and the large end of the clamping nut (5) is a threaded hole. The small end fits the positioning bushing (3), and the large end is connected to the clamping bolt (6) through a thread. The size of the smooth hole of the clamping nut (5) is set according to the size of the inner hole of the positioning bushing (3); the clamping bolt (6) is strung on the adhesive mandrel (9), and the outer side of the clamping bolt (6) is machined into a hexagonal hole for easy twisting. One end of the clamping bolt (6) is installed on the clamping nut (5) through a thread, and one end of the clamping bolt (6) is connected to the carbonized The tungsten shoulder bushing is non-shoulder-fitted, and the inner diameter size of the clamping bolt (6) is set according to the inner hole size of the positioning bushing (3); the inner hole size of the first sealing gasket (7) is set according to the outer circle size of the non-shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle, and the inner hole size of the second sealing gasket (8) is set according to the outer circle size of the non-shoulder part of the tungsten carbide shoulder bushing to ensure a close fit with the outer circle; the length of the adhesive mandrel (9) is longer than the distance between the two side wall panels on the base (1), and the diameter size of the adhesive mandrel (9) is selected according to the inner diameter of the tungsten carbide shoulder bushing.

2. The device according to claim 1, characterized in that After the positioning bushing (3) is assembled, the inner hole and the end face of the positioning bushing (3) are subjected to secondary processing, and the linear dimension and shape and position tolerance after the secondary processing are three times the requirements of the torque arm square arm assembly.

3. The device according to claim 1, characterized in that The pressing bushing (4) is 0.05-0.1 mm larger than the inner hole of the positioning bushing (3).

4. The device according to claim 1, characterized in that The size of the light hole of the clamping nut (5) is 0.05-0.1 mm larger than the inner hole of the positioning bushing (3).

5. The device according to claim 1, characterized in that The inner diameter of the clamping bolt (6) is 0.05-0.1 mm larger than the inner hole of the positioning bushing (3).

6. The device according to claim 1, characterized in that The difference between the diameter of the adhesive core rod (9) and the inner diameter of the tungsten carbide shoulder bushing is no more than 0.01 mm.

7. The device according to claim 1, characterized in that Four light holes and four threaded holes are processed on the side wall panels of the base (1), and the four light holes are used to install the positioning bushings (3), and there are four positioning bushings (3) in total.

8. A method for gluing a helicopter torque arm square arm assembly, characterized in that: include: Step 1: Initially install the tungsten carbide shoulder bushing onto the square arm of the torque arm; Step 2: Install the first sealing ring (7) and the second sealing ring (8) on both sides of the tungsten carbide shoulder bushing to complete the pre-assembly of the torque arm square arm assembly; Step 3: Place the pre-assembled torque arm square arm assembly on the support plate (2), adjust the position of the torque arm square arm assembly by compressing the rubber pad, ensure that the hole of the torque arm square arm assembly is aligned with the hole on the positioning bushing (3), and then insert the adhesive mandrel (9) into the hole of the torque arm square arm assembly and the hole on the positioning bushing (3); Step 4: Use a wrench to rotate the clamping nut (5) in the tightening direction. The rotation of the clamping nut (5) will drive the clamping bushing (4) to tighten the torque arm square arm assembly (10) until the outer end surface of the tungsten carbide boss bushing of the torque arm square arm assembly (10) fits with the positioning bushing (3); Step 5: Place the torque arm square arm assembly (10) and the bonding device in a high temperature box to cure the glue.

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