Punching method and special punching tool for aviation HB-02-A type cotter pin

Abstract

The invention relates to a forging method and a special forging tool for an aviation HB-02-A type cotter pin. According to the technical scheme, the device is formed by combining a mechanical part and an electric control part, and is simple in structure, low in cost, small in size and convenient to carry; the power part is electric, so that time and labor are saved; the cotter pin bending and buckling device is simple in structure and ingenious in design, synchronous high-precision bending and buckling of two remaining pins of a cotter pin can be achieved, it can be guaranteed that each bend at the tail of the cotter pin is formed at a time, deformation and dislocation of the cotter pin in the mounting process are effectively avoided, mounting efficiency is greatly improved, and the mounting precision of the cotter pin is further guaranteed. The stress intensity of the cotter pin is reserved to the maximum extent, and the requirements for high anti-loosening performance and high reliability of a mechanical connection structure in the aviation field are well met. According to the invention, the mounting quality of the cotter pin is improved, the working intensity of field operators and inspectors is reduced, the personal safety of the operators is ensured, and the risk of nut damage is reduced.

Description

Technical Field

[0001] The invention relates to a method for forging a cotter pin after bolt connection of an aviation aircraft product is completed and a special tool for automatic forging, in particular to a method for forging a cotter pin of HB-02-A type used for aviation and a special tool for forging. Background Art

[0002] In the manufacturing process of aircraft and other aviation products, in addition to rivets, bolts are also widely used to connect parts. The advantages of bolt connection are simple construction process, easy installation, simple structure, and easy disassembly. In the composite material area, it is more widely used due to the easy delamination of composite materials. With the high-speed movement and high-frequency vibration of aircraft, there is a risk of loosening of bolted connections. Therefore, a large number of anti-loosening measures must be used to prevent the bolted connection from loosening. If the anti-loosening measures do not meet the design requirements, the bolted connection will become loose, which will cause the connection to fail and the strength to fail to meet the design requirements. In severe cases, the nut will fall off and produce excess. The falling of the nut may damage other parts or components. In more serious cases, the falling of the nut in the air intake will cause serious safety hazards to the aircraft engine, causing engine failure and affecting flight power, resulting in unpredictable serious consequences. Therefore, anti-loosening of bolted connections is particularly important and must be applied.

[0003] At present, the main methods of bolt connection loosening prevention are fuse loosening prevention, stop washer loosening prevention, cotter pin loosening prevention and punch point loosening prevention. This paper studies the cotter pin loosening prevention method and provides a safe and reliable technical solution. Aviation HB-02-A cotter pins are widely used in nuts and bolts to prevent them from relative rotation, achieve high-quality loosening prevention effect, and avoid aircraft accidents caused by bolt connection failure. Cotter pin loosening prevention is one of the better loosening prevention methods for bolts. Its quality requirements are that the surface of the cotter pin is not allowed to have burrs, cracks and rust spots, the head is not allowed to be twisted and broken, the tail is not allowed to be flattened and broken, and the cotter pin is not allowed to swing after installation.

[0004] In the existing technology, the main method of making cotter pins is manual making, that is, after the cotter pin is inserted into the bolt, the two remaining legs of the cotter pin are pried apart using tools such as screwdrivers and wrenches. In principle, the existing installation method of cotter pins is to open the cotter pin to 60° to meet the anti-loosening requirements. However, for fields with high reliability and high strength requirements such as aviation and aerospace equipment, it is necessary to roll the cotter pin back into the reserved groove of the nut to improve the anti-loosening performance and reliability. In this case, the traditional manual installation method assisted by tools such as screwdrivers and wrenches has the problems of difficult installation and adjustment, easy bending and deformation of the cotter pin, long installation process and poor installation process accuracy. Specifically, the position and bending angle of the cotter pin will be repeatedly adjusted during the installation process, thereby reducing the installation efficiency, wasting unnecessary time, and failing to ensure the product cycle on time to adapt to the tight production rhythm. In addition, although the cotter pin has high toughness, each leg is only allowed to be bent once, and the bent part is not allowed to break or crack, which makes the operation difficult. At the same time, the quality of manual forging is manually judged, and the quality standard varies from person to person, which is greatly affected by the operator's skill level. When using a screwdriver to forge the reserved groove of the nut, it is necessary to press the screwdriver hard to ensure that the remaining leg of the cotter pin is bent in place. When a high force is applied manually, the screwdriver blade is easy to slip out of the hand and cause damage to the nut, the surrounding parts of the nut and the operator. When searching for relevant patents, no high-quality methods and related patents that not only meet the needs of high anti-loosening performance and high reliability performance in the field of cotter pin forging of aviation products have been retrieved, and have the advantages of simple operation, fast installation speed, high forging quality, and safe operation process. Therefore, in order to facilitate the operator to forge the cotter pin and better ensure the quality after installation, a new aviation cotter pin forging device is urgently needed to quickly and efficiently perform cotter pin forging operations with quality and quantity. Summary of the invention

[0005] In order to solve the above problems, a simple method is explored, which has low labor intensity, high efficiency in split pin making, is not affected by the skill level of the operator, has a unified quality standard, and is not easy to cause damage to the operator and the nut. This technical solution is intended to provide an operator with a special electronic making tool dedicated to the making of HB-02-A type split pins. This technical solution is composed of two parts, mechanical and electronic control, with a simple structure, low cost, small size, and easy to carry; easy to operate, the power part is electric, saving time and effort; the design is ingenious, and the two remaining legs of the split pin can be synchronously bent and buckled with high precision, and each bend of the tail of the split pin can be formed once, effectively avoiding deformation and dislocation during the installation of the split pin, while greatly improving the installation efficiency, further ensuring the installation accuracy of the split pin, and retaining the stress strength of the split pin to the maximum extent, which well meets the needs of high anti-loosening performance and high reliability of mechanical connection structures in the aviation field. The present invention is to provide a method and a special tool for preventing the loosening of the HB-02-A type split pins for aviation for on-site operators to solve the problems in the above technical background.

[0006] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0007] In order to adapt to the production rhythm, improve production efficiency, ensure construction quality, reduce the workload of on-site inspectors and the uncertainty of manual operation, and at the same time, according to the current needs of aviation, aerospace and other fields for high anti-loosening performance and high reliability of mechanical connection structures, a special auxiliary device for making cotter pins for aviation screw connection anti-loosening and a method for quickly installing cotter pins are invented, specifically a HB-02-A type cotter pin making special device for aviation screw connection anti-loosening. The purpose of the present invention is to bend and buckle the two legs of the cotter pin synchronously, and to ensure that each bend of the cotter pin is formed once, the installation process is simple, the installation accuracy is high, the installation quality is standard, the installation efficiency can be greatly improved, and the stress strength of the cotter pin can be retained to the maximum extent. The present technical solution mainly involves installing a cotter pin on a nut workpiece. The nut workpiece specifically refers to a combination structure of a hexagonal nut and a bolt. The present technical solution specifically involves a hexagonal nut. The hexagonal nut has six corresponding sides. In the prior art, a pin hole is provided on the bolt. Each side of the nut corresponds to a nut groove, and two nut grooves in the same direction form a pair. The cotter pin passes through the pin hole of the bolt and a pair of nut grooves of the nut. Specifically, the two legs of the cotter pin are inserted from the nut groove corresponding to the side A of the nut, pass through the pin hole of the bolt, and then pass through the nut groove corresponding to the symmetrical opposite side B of the nut. The two sides are parallel to each other, so that the part of the cotter pin passing through the side B is the remaining leg of the cotter pin, such as Figure 1 shown.

[0008] A structural diagram of a special device for making HB-02-A type cotter pins for anti-loosening of aviation screw connections is shown in the attached figure. Figure 1 As can be seen from the figure, this patent consists of a mechanical structure and an electronic control system, which mainly includes a left working arm, a right working arm, a main support, bolts, hexagonal nuts, gaskets, a lead screw, a lead screw sleeve, a display screen, an upper cover, a main housing, a charging port, a forward button, a rewind button, a record button, a reset button, a power button, a servo motor, a single-chip microcomputer, a power module, a controller, a charging module, a speed sensor and a strain gauge and other components, wherein the mechanical structure consists of a left working arm, a right working arm, a main support, bolts, hexagonal nuts, gaskets, a lead screw and a lead screw sleeve and other components, and the mechanical structure is mainly used to complete the forging of the tail of the HB-02-A type cotter pin. The working arm and the right working arm are the main working parts of the present invention, and the material is tungsten steel, which has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance, especially its high hardness and toughness, and the shape can remain unchanged even after several operations, thereby extending the tool. The service life is ensured while the operation quality is also guaranteed. The working part is designed in the shape of a blade. When working, it directly acts on the tail of the cotter pin to press it into the groove of the nut, so as to realize the forging of the tail of the HB-02-A type cotter pin, ensure that the tail is forged in place, and meet the quality inspection requirements; bolts, hexagonal nuts and washers are the main connecting components of the present invention, and the bolt through holes on the working arm and the main support are used to connect the working arm and the main support, which is convenient for disassembly and maintenance; the main support is the main supporting component of the present invention, which has bolt through holes and a lead screw sleeve embedded inside, so as to support the left working arm and the right working arm and drive them to move synchronously; the lead screw and the lead screw sleeve are the main spiral transmission components of the present invention, which drive the lead screw sleeve to move back and forth through the rotation of the lead screw, and then drive the main support to make corresponding movements, and the main support drives the left working arm and the right working arm to complete the forging of the tail of the HB-02-A type cotter pin.

[0009] The electronic control system consists of a display screen, an upper cover, a main housing, a charging port, a forward button, a reverse button, a record button, a reset button, a power button, a servo motor, a single-chip computer, a power module, a controller, a charging module, a speed sensor, a strain gauge and other components. The electronic control system is mainly used to issue commands for implementing the split pin forging and realize the front and rear synchronous operation of the left working arm and the right working arm. The display screen is a 2.5-inch OLED high-contrast display screen. The high contrast ensures clear display even in strong light environments, and has the advantages of long life, self-luminescence and low power consumption. It can display the strain gauge feedback value and the forward and reverse rotation of the servo motor; the upper cover and the main housing are the supporting components of the electronic control system. A charging port is provided on the top, and a forward button, a reverse button, a record button, a reset button, a power button, a servo motor, a single-chip microcomputer, a power module, a controller, a charging module and a speed sensor are all screwed and installed inside the top; the forward button, the reverse button, the record button, the reset button and the power button are the main control buttons of the present invention, the forward button and the reverse button respectively control the forward and reverse rotation of the servo motor, and play the role of driving the lead screw to drive the main support forward and backward, the record button is used to complete the record and retention of the feedback value of the strain gauge, the reset button is used to restore the initial display state of the display screen, and the power button is used to realize the power-on of the entire electronic control system to ensure the smooth operation of the electronic control system; the servo motor It is the power component of the present invention, and its output end is connected to the speed sensor. The speed sensor can feed back the speed of the servo motor to the single-chip microcomputer, wherein the forward button and the reverse button can be used to realize forward and reverse rotation. When the forward button works, the forward button sends the command to the single-chip microcomputer, and the single-chip microcomputer issues a forward rotation instruction to the servo motor through the controller after processing. The servo motor is in forward rotation, and the output end of the servo motor is used to interfere with the lead screw to drive the lead screw to rotate forward, and the lead screw and the lead screw sleeve realize spiral transmission, thereby realizing the forward movement of the main support and completing the forging action of the cotter pin. On the contrary, if the reverse button works, the servo motor is reversed, and the output end of the servo motor is used to interfere with the lead screw to drive the lead screw to rotate backward. The lead screw and the lead screw sleeve realize spiral transmission, and then realize the retraction movement of the main support, until the servo motor retracts to the number of revolutions of the speed sensor, and the main support returns to its initial position; the single-chip microcomputer, controller, speed sensor and strain gauge are the control command components of the present invention, and the strain gauge is attached to the side ends of the left working arm and the right working arm. When the strain gauge reaches the set value, it means that the left working arm and the right working arm have completed the split pin forging, and its signal will be transmitted to the single-chip microcomputer. After processing, the drive controller will issue a retraction command, and the retraction speed sensor will collect the number of positive selection revolutions to complete the forging of a split pin; the power module and the charging module are the power supply components of the present invention, which can realize the charging and discharging of the power module and the storage of electric energy.

[0010] Beneficial effects of the present invention:

[0011] Through the analysis of the existing HB-02-A type cotter pin forging method, it is found that the forging workload is large, the forging work intensity is high, and the forging process is prone to incomplete forging. The cotter pin is prone to certain mechanical strain, which causes the stress strength of the cotter pin to decrease, further reducing the installation quality and the stress strength of the cotter pin. In addition, the forging standard is affected by the skill level of the operator, and the quality is uneven. When the tail of the cotter pin is beaten into the nut groove, the screwdriver is likely to scratch the nut and the operator.

[0012] In the process of product manufacturing, by implementing the above-mentioned special electronic tools for forging HB-02-A split pins and using the above-mentioned forging method, the installation quality of split pins is improved, the work intensity of on-site operators and inspectors is reduced, the personal safety of operators is guaranteed, and the risk of nut damage is reduced. This improves production efficiency, shortens product cycles, curbs time waste, adapts well to production rhythms, greatly improves the first-time inspection pass rate, achieves the effect of quality and quantity assurance, and responds to the purpose of achieving good and fast products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 1. It is a schematic diagram of the cotter pin installation structure;

[0014] Figure 2 Axonometric view of a split pin forging device used to prevent bolt connections from loosening;

[0015] Figure 3 It is a top view of a split pin making device used for preventing bolt connection from loosening;

[0016] Figure 4 It is a rear view of a cotter pin forging device used to prevent bolt connections from loosening.

[0017] Among them, 1-left working arm, 2-right working arm, 3-main support, 4-bolt, 5-hexagonal nut, 6-gasket, 7-screw, 8-screw sleeve, 9-display screen, 10-upper cover, 11-main housing, 12-charging port, 13-forward button, 14-back button, 15-record button, 16-reset button, 17-power button, 18-servo motor, 19-single-chip microcomputer, 20-power module, 21-controller, 22-charging module, 23-speed sensor, 24-strain gauge. DETAILED DESCRIPTION

[0018] This implementation case discloses a method for quickly installing aviation HB-02-A type cotter pins, which is a basic implementation scheme of the present invention, including preliminary bending, forging preparation, debugging tools and forging preparation, forging operation and disengagement operation.

[0019] Embodiment 1:

[0020] A structural diagram of a special device for making HB-02-A type cotter pins for anti-loosening of aviation screw connections is shown in the attached figure. Figure 1 As can be seen from the figure, this patent consists of a mechanical structure and an electronic control system, which mainly includes a left working arm 1, a right working arm 2, a main support 3, a bolt 4, a hexagonal nut 5, a gasket 6, a lead screw 7, a lead screw sleeve 8, a display screen 9, an upper cover 10, a main housing 11, a charging port 12, a forward button 13, a rewind button 14, a record button 15, a reset button 16, a power button 17, a servo motor 18, a single-chip microcomputer 19, a power module 20, a controller 21, a charging module 22, a speed sensor 23 and a strain The mechanical structure is composed of a left working arm 1, a right working arm 2, a main support 3, a bolt 4, a hexagonal nut 5, a gasket 6, a lead screw 7 and a lead screw sleeve 8. The mechanical structure is mainly used to complete the forging of the tail of the HB-02-A type cotter pin. The working arm 1 and the right working arm 2 are the main working parts of the present invention. The material is tungsten steel hard alloy, which has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc., especially its high hardness and toughness, even if it is used as The shape can be kept unchanged even after repeated operations, thereby extending the service life of the tool and ensuring the operation quality. The working part is designed in the shape of a blade. When working, it directly acts on the tail of the cotter pin and presses it into the groove of the nut, which is used to realize the forging of the tail of the HB-02-A type cotter pin, ensuring that the tail is forged in place and meets the quality inspection requirements; the bolt 4, the hexagonal nut 5 and the gasket 6 are the main connecting components of the present invention, and the bolt through holes on the working arm and the main support 3 are used to connect the working arm and the main support 3, which is convenient for disassembly and maintenance; the main support 3 is the main supporting component of the present invention, which has bolt through holes and a lead screw sleeve 8 embedded inside, to support the left working arm 1 and the right working arm 2, and drive them to move synchronously; the lead screw 7 and the lead screw sleeve 8 are the main spiral transmission components of the present invention, and the lead screw sleeve 8 is driven to move forward and backward through the rotation of the lead screw 7, thereby driving the main support 3 to make corresponding movements, and the main support 3 drives the left working arm 1 and the right working arm 2 to complete the forging of the tail of the HB-02-A type cotter pin.

[0021] The electric control system is composed of a display screen 9, an upper cover plate 10, a main housing 11, a charging port 12, a forward button 13, a reverse button 14, a record button 15, a reset button 16, a power button 17, a servo motor 18, a single-chip microcomputer 19, a power module 20, a controller 21, a charging module 22, a rotation sensor 23 and a strain gauge 24. The electric control system is mainly used to issue commands for implementing the split pin forging and realize the front and rear synchronous work of the left working arm 1 and the right working arm 2. The display screen 9 is 2.5-inch OLED high-contrast display screen, the high contrast ensures clear display even in strong light environment, and has the advantages of long life, self-luminescence and low power consumption, etc., on which the feedback value of the strain gauge 24 and the forward and reverse rotation of the servo motor 18 can be displayed; the upper cover 10 and the main housing 11 are the supporting components of the electric control system, with a charging port 12, a forward button 13, a rewind button 14, a record button 15, a reset button 16, a power button 17, a servo motor 18, a single-chip computer 19, a power module 20, a controller 21, a charging module 22 and a speed sensor 23 are all installed inside by screw connection; the forward button 13, the rewind button 14, the record button 15, the reset button 16, the power button 17, the servo motor 18, the single-chip computer 19, the power module 20, the controller 21, the charging module 22 and the speed sensor 23 are all installed inside by screw connection; the forward button 13, the rewind button 14, the record button 15, the reset button 16, the power button 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17, the power module 17 and the speed sensor 17 are all installed inside by screw connection; the forward button 13, the rewind button 14, the record button 15, the reset button 16, the power ... 6 and the power button 17 are the main control buttons of the present invention, the forward button 13 and the retract button 14 respectively control the forward and reverse rotation of the servo motor 18, play the role of driving the lead screw 7 to drive the main support 3 forward and backward, the record button 15 is used to complete the record retention of the feedback value of the strain gauge 24, the reset button 16 is used to restore the initial display state of the display screen 9, and the power button 17 is used to realize the power-on of the entire electric control system to ensure the smooth operation of the electric control system; the servo motor 18 is the power component of the present invention, and its output end is connected to the speed sensor 23, and the speed sensor 23 can feed back the speed of the servo motor 18 to the single-chip microcomputer 19, wherein the forward button 13 and the retract button 14 can be used to realize Forward and reverse rotation, when the forward button 13 works, the forward button 13 sends a command to the single-chip microcomputer 19, and the single-chip microcomputer 19 issues a forward rotation command to the servo motor 18 through the controller 21 after processing. The servo motor 18 is forward-rotating, and the output end of the servo motor 18 is used to interfere with the screw 7, so as to drive the screw 7 to rotate forward, and the screw 7 and the screw sleeve 8 realize spiral transmission, thereby realizing the forward movement of the main support 3 and completing the forging action of the cotter pin. On the contrary, if the retract button 14 works, the servo motor 18 is reverse-rotating, and the output end of the servo motor 18 is used to interfere with the screw 7, so as to drive the screw 7 to rotate backward, and the screw 7 and the screw sleeve 8 realize spiral transmission, thereby realizing the retracting movement of the main support 3, until the servo The motor 18 retracts to the number of revolutions of the revolution sensor 23, and the main support 3 returns to its initial position; the single chip microcomputer 19, the controller 21, the revolution sensor 23 and the strain gauge 24 are the control command components of the present invention. The strain gauge 24 is attached to the side ends of the left working arm 1 and the right working arm 2. When the strain gauge 24 reaches the set value, it means that the left working arm 1 and the right working arm 2 have completed the split pin forging. Its signal will be transmitted to the single chip microcomputer 19. After processing, the controller 21 will be driven to issue a retraction command. The retraction revolution sensor 23 collects the number of positive selection revolutions to complete the split pin forging; the power module 20 and the charging module 22 are the power supply components of the present invention, which can realize the charging and discharging of the power module 20 and the storage of electric energy.

[0022] Embodiment 2:

[0023] Taking the manufacture of Φ5 bolt cotter pin as an example, the usage is as follows:

[0024] Step 1: Preliminary bending. Select a cotter pin of corresponding specifications, trim the cotter pin length according to the nut model of the nut workpiece, then insert the trimmed cotter pin into the cylindrical pin of the nut workpiece, and bend the two cotter pin legs outside the nut workpiece apart so that the angle between the two legs is about 120°;

[0025] Step 2: Debugging the tool. Press the special tool power button 17, and after the display screen 9 lights up and displays the Φ5 bolt synchronously, it enters the forging preparation stage and the debugging is completed;

[0026] Step 3: Preparation for forging. Place the two working ends of the left working arm 1 and the right working arm 2 on the two remaining legs of the split pin that have formed an angle of 120°, and make the forging tool lead screw 7 coincide with the bisector of the split pin opening angle, ensuring that the two remaining legs are bent and buckled synchronously, and the preparation for forging is completed;

[0027] Step 4: Forging operation. After everything is ready, press the forward button 13, the servo motor 18 is forward, and the output end of the servo motor 18 is in interference fit with the lead screw 7, driving the lead screw 7 to forward, and the lead screw 7 and the lead screw sleeve 8 realize spiral transmission, completing the forward movement of the left working arm 1 and the right working arm 2 driven by the main support 3. When the strain gauges 24 attached to the side ends of the left working arm 1 and the right working arm 2 reach the specified value, the forging operation of the cotter pin is completed;

[0028] Step 5: Disengagement from the operation. Press the retraction button 14, the lead screw 7 starts to rotate counterclockwise, and the left working arm 1 and the right working arm 2 start to move under the action of the screw transmission, thereby completing the retraction work. Disengage the forging tool from the working point, and the operation is completed.

Claims

1. A method for forging a cotter pin of type HB-02-A for aviation and a special tool for forging a cotter pin, characterized in that: The invention comprises a left working arm (1), a right working arm (2), a main support (3), a bolt (4), a hexagonal nut (5), a gasket (6), a lead screw (7), a lead screw sleeve (8), a display screen (9), an upper cover plate (10), a main housing (11), a charging port (12), a forward button (13), a reverse button (14), a recording button (15), a reset button (16), a power button (17), a servo motor (18), a single chip microcomputer (19), a power module (20), a controller (21), a charging module (22), a rotation sensor (23) and a strain gauge (24). The mechanical structure is composed of a left working arm (1), a right working arm (2), a main support (3), a bolt (4), a hexagonal nut (5), a gasket (6), a lead screw (7) and a lead screw sleeve (8). The bolt (4), the hexagonal nut (5) and the gasket (6) use the bolt through holes on the working arm and the main support (3) to connect the working arm and the main support (3); the main support (3) is provided with bolt through holes and a lead screw sleeve (8) is embedded inside, so as to support the left working arm (1) and the right working arm (2) and drive them to move synchronously; the lead screw sleeve (8) drives the lead screw sleeve (8) to move forward and backward through the rotation of the lead screw (7), thereby driving the main support (3) to make corresponding movements, and the main support (3) drives the left working arm (1) and the right working arm (2) to complete the forging of the tail of the HB-02-A type cotter pin; The electric control system is composed of a display screen (9), an upper cover plate (10), a main housing (11), a charging port (12), a forward button (13), a reverse button (14), a record button (15), a reset button (16), a power button (17), a servo motor (18), a single-chip microcomputer (19), a power module (20), a controller (21), a charging module (22), a rotation sensor (23) and a strain gauge (24). The upper cover plate (10) and the main housing (11) are supporting components of the electric control system, and are provided with a charging port (12), a forward button (13), a reverse button (14), a record button (15), a reset button (16), a power button (17), a servo motor (18), a single-chip microcomputer (19), a power module (20), a controller (21), a charging module (22), a rotation sensor (23) and a strain gauge (24). The machine button (17), servo motor (18), single chip microcomputer (19), power module (20), controller (21), charging module (22) and speed sensor (23) are all installed in the interior thereof by screw connection; the forward button (13) and the reverse button (14) respectively control the forward and reverse rotation of the servo motor (18), play the role of driving the lead screw (7) to drive the main support (3) forward and backward, the recording button (15) is used to complete the recording and retention of the feedback value of the strain gauge (24), the reset button (16) is used to restore the initial display state of the display screen (9), and the power button (17) is used to realize the power-on of the entire electric control system to ensure the smooth operation of the electric control system. The servo motor (18) is connected to a rotation sensor (23) at its output end, and the rotation sensor (23) can feed back the rotation speed of the servo motor (18) to the single-chip microcomputer (19), wherein the forward button (13) and the reverse button (14) can be used to realize forward and reverse rotation. When the forward button (13) works, the forward button (13) sends a command to the single-chip microcomputer (19), and the single-chip microcomputer (19) issues a forward rotation instruction to the servo motor (18) through the controller (21) after processing, and the servo motor (18) is forward-rotated, and the output end of the servo motor (18) is used to have an interference fit with the lead screw (7), so as to drive the lead screw (7) to rotate forward, and the lead screw (7) and the lead screw sleeve are connected. The cylinder (8) realizes spiral transmission, thereby realizing the forward movement of the main support (3) and completing the forging action of the cotter pin. On the contrary, if the retraction button (14) is working, the servo motor (18) is reversely transmitted, and the output end of the servo motor (18) is used to interfere with the lead screw (7), so as to drive the lead screw (7) to reversely transmit, and the lead screw (7) and the lead screw sleeve (8) realize spiral transmission, thereby realizing the retraction movement of the main support (3), until the servo motor (18) retracts to the number of revolutions of the revolution sensor (23), and the main support (3) returns to the initial position; the single chip microcomputer (19), the controller (21), the revolution sensor (23) and the strain gauge (24) are the control command components of the present invention.

2. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 1, characterized in that: The working arm (1) and the right working arm (2) are made of tungsten steel, and the working parts are designed in the shape of blades. When working, they directly act on the tail of the split pin to press it into the groove of the nut.

3. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 1 or 2, characterized in that: The display screen (9) is a 2.5-inch OLED high-contrast display screen, which can display the feedback value of the strain gauge (24) and the forward and reverse rotation of the servo motor (18).

4. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 1 or 2, characterized in that: The strain gauge (24) is attached to the side ends of the left working arm (1) and the right working arm (2). When the strain gauge (24) reaches a set value, it indicates that the left working arm (1) and the right working arm (2) have completed the split pin forging. The signal is transmitted to the single chip microcomputer (19). After processing, the drive controller (21) issues a retraction command. The retraction rotation number sensor (23) collects the number of positive selection turns to complete the split pin forging.

5. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 3, characterized in that: The strain gauge (24) is attached to the side ends of the left working arm (1) and the right working arm (2). When the strain gauge (24) reaches a set value, it indicates that the left working arm (1) and the right working arm (2) have completed the split pin forging. The signal is transmitted to the single chip microcomputer (19). After processing, the drive controller (21) issues a retraction command. The retraction rotation number sensor (23) collects the number of positive selection turns to complete the split pin forging.

6. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 1, 2 or 5, characterized in that: The power module (20) and the charging module (22) realize the charging and discharging of the power module (20) and the storage of electric energy.

7. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 3, characterized in that: The power module (20) and the charging module (22) realize the charging and discharging of the power module (20) and the storage of electric energy.

8. The method for forging a HB-02-A type cotter pin for aviation and the special tool for forging a cotter pin as claimed in claim 4, characterized in that: The power module (20) and the charging module (22) realize the charging and discharging of the power module (20) and the storage of electric energy.

9. A method for forging a cotter pin of type HB-02-A for aviation and a method for using a special tool for forging the cotter pin, characterized in that: Here are the steps: Step 1: Preliminary bending; select a cotter pin of corresponding specifications, trim the cotter pin length according to the nut model of the nut workpiece, then insert the trimmed cotter pin into the cylindrical pin of the nut workpiece, and break the two cotter pin legs outside the nut workpiece apart so that the angle between the two legs is 120°; Step 2: Debugging the tool; press the special tool power button (17), wait for the display screen (9) to light up and display the fixed bolts synchronously, then enter the preparation stage for forging, and debugging is completed; Step 3: Preparation for forging; the two working ends of the left working arm (1) and the right working arm (2) are respectively placed on the two remaining legs of the split pin that have formed an angle of 120°, and the forging tool lead screw (7) is aligned with the bisector of the split pin opening angle, ensuring that the two remaining legs are synchronously bent and buckled, and the preparation for forging is completed; Step 4: Forging operation; after all preparations are completed, the forward button (13) is pressed, the servo motor (18) is forward-transmitted, and the output end of the servo motor (18) is interference-fitted with the lead screw (7), driving the lead screw (7) forward, and the lead screw (7) and the lead screw sleeve (8) realize spiral transmission, completing the forward movement of the left working arm (1) and the right working arm (2) driven by the main support (3). When the strain gauges (24) attached to the side ends of the left working arm (1) and the right working arm (2) reach the specified value, the forging operation of the cotter pin is completed; Step 5: Disengage from the operation; press the retract button (14), the lead screw (7) starts to rotate counterclockwise, and the left working arm (1) and the right working arm (2) start to move under the action of the screw drive, thereby completing the retracting operation; disengage from the forging tool at the working point, and the operation is completed.

Images