Method and tool for swaging HB-02-A type split pin for aviation

Abstract

The present application relates to a kind of for aviation HB-02-A type split pin hammering method and hammering special tool.This technical scheme is combined by mechanical and electric control two parts, simple structure, low cost, and small, easy to carry;It is easy to operate, power part is electric, time-saving and labor-saving;Design is ingenious, can realize split pin two remaining foot synchronous high-precision bending and buckle position, and can ensure that each bending of split pin tail is formed once, effectively avoid the deformation misplacement in the installation process of split pin, while greatly improve installation efficiency, further guarantee the installation accuracy of split pin, maximum limit the stress intensity of split pin, well satisfy the need of high anti-looseness performance and high reliability of mechanical connection structure in aviation field.The present application improves the installation quality of split pin, reduces the work intensity of on-site operator and inspector, guarantees the personal safety of operator, reduces the risk of nut damage.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for punching an open pin after the completion of bolt connection of an aircraft product and an automatic punching tool special for the method, in particular to a method for punching an HB-02-A type open pin of an aircraft and a punching tool special for the method. BACKGROUND

[0002] In the manufacturing process of an aircraft and other aircraft products, in addition to rivets, bolts are also used in large quantities for connecting parts. The use of bolts has the advantages of simple construction process, easy installation, simple structure and easy disassembly. In the composite material area, the use of bolts is more widespread due to the characteristics of the composite material that is easy to delaminate. With the high-speed movement and high-frequency vibration of the aircraft, the bolts may become loose, so a large number of anti-loosening measures must be used for bolt connection to prevent loosening. If the anti-loosening measures do not meet the design requirements, the bolt connection may become loose, which may cause the connection to fail, the strength to not meet the design requirements, or the nut to fall off and generate excess material, which may damage other parts or components, or in a more serious case, the nut falling off into the air inlet may cause a serious safety hazard to the aircraft engine, resulting in engine failure and affecting the power of the aircraft, causing unpredictable serious consequences. Therefore, bolt connection anti-loosening is particularly important and must be applied.

[0003] At present, the main bolt connection anti-loosening methods include fuse anti-loosening, stop washer anti-loosening, open pin anti-loosening and impact point anti-loosening. This paper studies the open pin anti-loosening method and provides a safe and reliable technical solution. The HB-02-A type open pin of an aircraft is widely used in the connection between nuts and bolts to prevent them from rotating relative to each other, achieving high-quality anti-loosening effect and avoiding the occurrence of aircraft accidents caused by bolt connection failure. Open pin anti-loosening is one of the better anti-loosening methods for bolts, and the quality requirements are that the surface of the open pin must not have burrs, cracks and rust spots, the head must not be twisted and broken, the tail must not be flattened and broken, and the installed open pin must not swing.

[0004] In the prior art, the main way to make split pins is manual, that is, after the split pin is inserted into the bolt, the two remaining legs of the split pin are pried open with a screwdriver, wrench or other tools. The existing installation method of split pins can meet the anti-loosening requirement when the split pin is pried open to 60°. However, for fields such as aviation and aerospace equipment that require high reliability and high strength, the split pin needs to be rolled back into the groove reserved for the nut to improve the performance and reliability of anti-loosening. In this case, the traditional manual installation method assisted by a screwdriver, wrench or other tools has the problems of difficult installation adjustment, easy bending and deformation of the split pin, long installation time, and poor installation process precision. Specifically, the position and bending angle of the split pin need to be adjusted repeatedly during installation, which reduces the installation efficiency, wastes unnecessary time, and cannot guarantee the product cycle on time to adapt to the tight production rhythm. In addition, although the split pin has high toughness, each leg of the split pin can only be bent once, and the bent part is not allowed to break or crack. The operation is difficult, and the quality of manual production is judged by the operator, which varies from person to person and is greatly affected by the operator's skill level. When the screwdriver is used to make the nut reserved groove, the screwdriver needs to be pressed to ensure that the remaining leg of the split pin is bent in place. Under the condition of high human force, the screwdriver blade is easy to slip and damage the nut, the surrounding parts and the operator. After searching related patents, no high-quality method or related patent that can meet the needs of high anti-loosening performance and high reliability performance in the field of aviation product split pin making, and has the advantages of simple operation, fast installation speed, high production quality and safe operation process has been found. Therefore, in order to facilitate the operator to make split pins and better ensure the quality after installation, a new aviation split pin making device is needed to make split pins quickly, efficiently, with quality and quantity. SUMMARY

[0005] In order to solve the above problems, a simple method is explored, which has low labor intensity, high efficiency of split pin punching, is not affected by the skill level of the operator, uniform quality standard, and is not easy to cause damage to the operator and the nut. The technical scheme aims to provide an operator with a special electronic punching tool specially used for HB-02-A split pin punching. The technical scheme is composed of mechanical and electrical control parts, which has simple structure, low cost, small size and is convenient to carry; the operation is simple, the power part is electric, which saves time and effort; the design is ingenious, which can realize synchronous high-precision bending and locking of the two remaining feet of the split pin, and can ensure that each bending of the tail part of the split pin is formed once, effectively avoids deformation and misplacement of the split pin during installation, greatly improves the installation efficiency, further ensures the installation accuracy of the split pin, maximizes the stress strength of the split pin, and well meets the needs of high anti-looseness performance and high reliability performance of the mechanical connection structure in the aviation field. The present application provides a split pin punching method and special tool for preventing aviation HB-02-A split pin from loosening, so as to solve the problems in the above technical background.

[0006] The technical problems solved by the present application are realized by the following technical solutions:

[0007] In order to adapt to the production rhythm, improve the production efficiency, ensure the construction quality, reduce the working intensity of the on-site inspection personnel and the uncertainty of human operation, and according to the needs of high anti-looseness performance and high reliability performance of the mechanical connection structure in the aviation and space fields, a split pin punching special auxiliary device and a method for quickly installing split pin for aviation screw connection anti-loosening are invented, specifically a split pin punching special device for aviation screw connection anti-loosening. The purpose of the present application is to bend and lock the two feet of the split pin synchronously, and to ensure that each bending of the split pin is formed once, which is simple and convenient to install, has high installation accuracy, high installation quality standard, can greatly improve the installation efficiency, and can maximize the stress strength of the split pin. In the technical scheme, the installation of split pin on the nut workpiece is mainly involved, and the nut workpiece specifically refers to the combined structure of hexagonal nut and bolt. In the present application, a hexagonal nut is specifically involved, and the hexagonal nut has six sides. In the prior art, a pin hole is provided on the bolt, and each side of the nut has a nut groove, and a pair of nut grooves are formed by two same direction nut grooves. The split pin corresponds to the pin hole of the bolt and a pair of nut grooves of the nut. Specifically, the two feet of the split pin are inserted into the nut groove corresponding to the side A of the nut, pass through the pin hole of the bolt, and then pass out of the nut groove corresponding to the opposite side B of the nut, and the two sides of the pass-in and pass-out are parallel to each other, so that the part of the split pin passing out of the side B is the remaining foot of the split pin, as shown in Figure 1 .

[0008] A split pin punching special device structure diagram for aviation screw connection anti-loosening of HB-02-A type is shown in the accompanyingFigure 1 As shown in the figure, the patent is composed of mechanical structure and electric control system, mainly including left working arm, right working arm, main support, bolt, hexagonal nut, gasket, lead screw, lead screw sleeve, display screen, upper cover plate, main shell, charging port, forward button, back button, record button, reset button, power-on button, servo motor, single-chip microcomputer, power module, controller, charging module, revolution sensor and strain gauge, etc. The mechanical structure is composed of left working arm, right working arm, main support, bolt, hexagonal nut, gasket, lead screw and lead screw sleeve, etc. The mechanical structure is mainly used to complete the punching of the tail of HB-02-A split pin. The working arm and right working arm are the main working parts of the invention. The material is tungsten steel, which has a series of excellent properties such as high hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance, etc. Especially its high hardness and toughness can keep the shape unchanged even after several operations, thereby prolonging the service life of the tool and ensuring the operation quality. The working part is designed in the shape of a knife blade, which directly acts on the tail of the split pin and presses it into the nut groove during work, so as to realize the punching of the tail of HB-02-A split pin and ensure that the tail is punched in place, meeting the quality inspection requirements. The bolt, hexagonal nut and gasket are the main connecting components of the invention. The bolt through hole on the working arm and main support is used to connect the working arm and main support, which is convenient for disassembly and maintenance. The main support is the main supporting component of the invention, which has a bolt through hole and a lead screw sleeve embedded inside, so as to support the left and right working arms and drive them to move synchronously. The lead screw and lead screw sleeve are the main screw transmission components of the invention. The rotation of the lead screw drives the lead screw sleeve to move forward and backward, thereby driving the main support to move correspondingly. The main support drives the left and right working arms to complete the punching work of the tail of HB-02-A split pin.

[0009] The electric control system is composed of a display screen, an upper cover plate, a main shell, a charging port, an advancing button, a back-off button, a recording button, a reset button, a start button, a servo motor, a single-chip microcomputer, a power module, a controller, a charging module, a rotation number sensor and a strain gauge, and is mainly used for issuing a command for opening pin forging, realizing synchronous working of left and right working arms, and displaying the feedback value of the strain gauge and the forward and reverse rotation of the servo motor on the 2.5-inch OLED high-contrast display screen. The upper cover plate and the main shell are support components of the electric control system, and the advancing button, the back-off button, the recording button, the reset button, the start button, the servo motor, the single-chip microcomputer, the power module, the controller, the charging module and the rotation number sensor are all installed in the electric control system in a screwing manner. The advancing button, the back-off button, the recording button, the reset button and the start button are main control buttons of the electric control system, the advancing button and the back-off button are used for controlling the forward and reverse rotation of the servo motor, the recording button is used for recording the feedback value of the strain gauge, the reset button is used for restoring the initial display state of the display screen, and the start button is used for realizing the power-on of the electric control system and ensuring the stable operation of the electric control system. The servo motor is a power component of the electric control system, and the output end of the servo motor is connected with the rotation number sensor. The rotation number sensor can feed back the rotation speed of the servo motor to the single-chip microcomputer. The advancing button and the back-off button can be used for realizing the forward and reverse rotation. When the advancing button works, the advancing button sends a command to the single-chip microcomputer, the single-chip microcomputer processes the command, and then sends a forward rotation instruction to the servo motor through the controller, the servo motor rotates forward, the servo motor output end is in interference fit with the lead screw, the lead screw rotates forward, the lead screw and the lead screw sleeve realize screw transmission, the main support moves forward, the opening pin forging is completed, and vice versa. When the back-off button works, the servo motor rotates reversely, the servo motor output end is in interference fit with the lead screw, the lead screw rotates reversely, the lead screw and the lead screw sleeve realize screw transmission, the main support moves back, and the servo motor moves back to the rotation number of the rotation number sensor, and the main support returns to the initial position.

[0010] The beneficial effects of the present application are as follows:

[0011] Through the analysis of the existing HB-02-A type split pin forging method, there are large forging workload, high forging work intensity, and the forging process is prone to not reach the position, etc. The split pin is prone to certain mechanical wear, which reduces the stress intensity of the split pin, further reduces the installation quality, reduces the stress intensity of the split pin, and the forging standard is affected by the skill level of the operator, the quality is uneven, and when the split pin tail is forged into the nut groove, the screwdriver is easy to scratch the nut and the operator.

[0012] In the product production process, by implementing the above-mentioned special electronic tool for forging HB-02-A split pin and using the above-mentioned forging method, the installation quality of the split pin is improved, the work intensity of the on-site operator and the inspector is reduced, the personal safety of the operator is ensured, and the risk of nut damage is reduced. Thus, the production efficiency is improved, the product cycle is shortened, the time waste is curbed, the production rhythm is well adapted, the first-time inspection pass rate is greatly improved, the quality and quantity are achieved, and the goal of good and fast product implementation is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a split pin installation structure schematic diagram;

[0014] Figure 2 is an axial view of a split pin forging device for bolt connection anti-loose;

[0015] Figure 3 is a top view of a split pin forging device for bolt connection anti-loose;

[0016] Figure 4 is a rear view of a split pin forging device for bolt connection anti-loose.

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

[0018] The present embodiment case discloses a method for quickly installing aviation HB-02-A type split pin, which is a basic embodiment of the present application, including preliminary bending, forging preparation, debugging tool and forging preparation, forging operation and disengagement operation. EMBODIMENT

[0019] A structure diagram of a special device for making HB-02-A split pin for aviation threaded anti-loosening is shown in the accompanying Figure 1 As shown in the figure, the patent is composed of mechanical structure and electric control system, mainly including left working arm 1, right working arm 2, main support 3, bolt 4, hexagonal nut 5, gasket 6, lead screw 7, lead screw sleeve 8, display screen 9, upper cover plate 10, main shell, charging port 12, forward button 13, back button 14, record button 15, reset button 16, power-on button 17, servo motor 18, single-chip microcomputer 19, power module 20, controller 21, charging module 22, revolution sensor 23 and strain gauge 24, etc. The mechanical structure is composed of left working arm 1, right working arm 2, main support 3, bolt 4, hexagonal nut 5, gasket 6, lead screw 7 and lead screw sleeve 8, etc. The mechanical structure is mainly used to complete the making of the tail of HB-02-A split pin. The working arm 1 and right working arm 2 are the main working parts of the invention, which are made of tungsten steel hard alloy, having 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 can keep the shape unchanged even after several operations, thereby prolonging the service life of the tool and ensuring the operation quality. The working part is designed in the shape of a blade, which directly acts on the tail of the split pin and presses it into the nut groove during operation, so as to realize the making of the tail of HB-02-A split pin and ensure that the tail is made in place, meeting the quality inspection requirements. The bolt 4, hexagonal nut 5 and gasket 6 are the main connecting components of the invention, which are connected with the working arm and main support 3 through the bolt through hole on the working arm and main support 3, facilitating disassembly and maintenance. The main support 3 is the main supporting component of the invention, which is provided with a bolt through hole and embedded with a lead screw sleeve 8 inside, so as to support the left working arm 1 and right working arm 2 and drive them to move synchronously. The lead screw 7 and lead screw sleeve 8 are the main screw transmission components of the invention, which drive the lead screw sleeve 8 to move forward and backward through the rotation of the lead screw 7, and then drive the main support 3 to move correspondingly. The main support 3 drives the left working arm 1 and right working arm 2 to complete the making work of the tail of HB-02-A split pin.

[0020] The electric control system is composed of display screen 9, upper cover plate 10, main machine shell, charging port 12, forward button 13, back button 14, recording button 15, reset button 16, start button 17, servo motor 18, single-chip microcomputer 19, power module 20, controller 21, charging module 22, revolution sensor 23 and strain gauge 24, etc. The electric control system is mainly used to issue the command of implementing the split pin forging, to realize the front and back synchronous work of the left working arm 1 and the right working arm 2, and the display screen 9 is 2.5 inch OLED high contrast display, high contrast ensures that in strong light environment can also be clearly displayed, and has the advantages of long life, self-luminous and low power consumption, which can display the feedback value of strain gauge 24 and the forward and reverse rotation of servo motor 18; the upper cover plate 10 and the main shell are the support components of the electric control system, which have a charging port 12, an advance button 13, a back button 14, a record button 15, a reset button 16, a power-on button 17, a servo motor 18, a single-chip microcomputer 19, a power module 20, a controller 21, a charging module 22 and a revolution sensor 23 installed inside by screwing; the advance button 13, the back button 14, the record button 15, the reset button 16 and the power-on button 17 are the main control buttons of the application, the advance button 13 and the back button 14 control the forward and reverse rotation of the servo motor 18 respectively, which drives the lead screw 7 to advance and retreat the main support 3, the record button 15 records the feedback value of the strain gauge 24, the reset button 16 restores the initial display state of the display 9, and the power-on button 17 realizes 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 application, and the output end thereof is connected with the revolution sensor 23, which can feed back the rotation speed of the servo motor 18 to the single-chip microcomputer 19, wherein the forward and reverse rotation can be realized by the advance button 13 and the back button 14, when the advance button 13 works, the advance button 13 sends a command to the single-chip microcomputer 19, the single-chip microcomputer 19 processes and then sends a forward rotation instruction to the servo motor 18 through the controller 21, the servo motor 18 rotates forward, the output end of the servo motor 18 is in interference fit with the lead screw 7, which drives the lead screw 7 to rotate forward, the lead screw 7 and the lead screw sleeve 8 realize screw transmission, and then the main support 3 advances, the opening pin is punched, conversely, if the back button 14 works, the servo motor 18 rotates reversely, the output end of the servo motor 18 is in interference fit with the lead screw 7, which drives the lead screw 7 to rotate reversely, the lead screw 7 and the lead screw sleeve 8 realize screw transmission, and then the main support 3 retreats until the servo motor 18 retreats 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 application, the strain gauge 24 is attached to the side surface of the left working arm 1 and the right working arm 2, when the strain gauge 24 reaches the set value, it indicates that the left working arm 1 and the right working arm 2 complete the punching of the opening pin, the signal is transmitted to the single-chip microcomputer 19, which processes and then drives the controller 21 to issue a retreat command, the forward selected number of revolutions of the revolution sensor 23 is collected, and the punching of the opening pin is completed once; the power module 20 and the charging module 22 are the power supply components of the application, which can realize the charging and discharging of the power module 20 and the storage of electric energy. Embodiment

[0021] Taking the punching of Φ5 bolt opening pin as an example, the use method is as follows:

[0022] Step one: preliminary bending. Select the corresponding size of the split pin, according to the nut workpiece nut model pruning split pin length, then the split pin inserted into the nut workpiece cylinder pin, and the two split pin outside the nut workpiece foot broken, the angle between the two feet is about 120 °;

[0023] Step two: debugging tools. Press the special tool start button 17, after the screen of the display screen 9 is lit, Φ5 bolt is displayed synchronously, enter the preparation stage, debugging is completed;

[0024] Step three: preparation. The left and right working arms 1 and 2 are respectively pasted on the two feet of the split pin which has been 120 °, and the split tool screw 7 is coincided with the split angle angle bisector line of the split pin, to ensure that the two feet are synchronous bending and positioning, and the preparation is completed.

[0025] Step four: operation. After all the preparations are correct, press the forward button 13 button, the servo motor 18 is positive, the servo motor 18 output end and the screw sleeve 8 are used to drive the screw sleeve 8, the screw sleeve 8 and the screw sleeve 8 realize the screw transmission, complete the forward movement of the left and right working arms 1 and 2 driven by the main support 3, when the strain gauge 24 pasted on the side of the left and right working arms 1 and 2 reaches the specified value, the split pin is completed;

[0026] Step five: disengagement operation. Press the back button 14 button, the screw 7 begins to rotate counterclockwise, the left and right working arms 1 and 2 begin to displace under the action of screw transmission, and then complete the back work. From the working point to the disengagement of the split tool, the operation is completed.

Claims

1. A tool for forging cotter pins of aircraft type HB-02-A, characterized in that, It includes a left working arm (1), a right working arm (2), a main support (3), bolts (4), hexagonal nuts (5), washers (6), a lead screw (7), a lead screw sleeve (8), a display screen (9), a top cover plate (10), a main housing, 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 microcontroller (19), a power module (20), a controller (21), a charging module (22), a speed sensor (23), and strain gauges (24). The mechanical structure consists of a left working arm (1), a right working arm (2), a main support (3), bolts (4), hexagonal nuts (5), washers (6), a lead screw (7), and a lead screw sleeve (8). Bolts (4), hexagonal nuts (5), and washers (6) connect the working arm and the main support (3) using bolt through holes on the working arm and the main support (3). The main support (3) has bolt through holes and a lead screw sleeve (8) embedded inside, which supports the left working arm (1) and the right working arm (2) and drives them to move synchronously. The lead screw sleeve (8) moves back and forth through the rotation of the lead screw (7), which in turn drives the main support (3) to move accordingly. The main support (3) drives the left working arm (1) and the right working arm (2) to complete the work of hammering the tail of the HB-02-A type cotter pin. The electronic control system consists of a display screen (9), a top cover (10), a main housing, a charging port (12), a forward button (13), a back button (14), a record button (15), a reset button (16), a power button (17), a servo motor (18), a microcontroller (19), a power module (20), a controller (21), a charging module (22), a speed sensor (23), and strain gauges (24). The top cover (10) and the main housing are the supporting components of the electronic control system. The main housing has a charging port (12), a forward button (13), a back button (14), a record button (15), a reset button (16), and a power button (17). 17), Servo motor (18), microcontroller (19), power module (20), controller (21), charging module (22), and speed sensor (23) are all screwed into the main housing; the forward button (13) and the reverse button (14) control the forward and reverse rotation of the servo motor (18) respectively, which drives the lead screw (7) to drive the main support (3) forward and backward; the record button (15) is used to record and store 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 power on the entire electrical control system and ensure the smooth operation of the electrical control system. Stable operation; the output end of the servo motor (18) is connected to the speed sensor (23), which can feed back the speed of the servo motor (18) to the microcontroller (19). The forward and reverse directions can be achieved by using the forward button (13) and the back button (14). When the forward button (13) is working, the forward button (13) sends a command to the microcontroller (19). After processing, the microcontroller (19) sends a forward rotation command to the servo motor (18) through the controller (21). The servo motor (18) rotates forward. The output end of the servo motor (18) is interference-fitted with the lead screw (7), which drives the lead screw (7) to rotate forward. The lead screw (7) and the lead screw... The lever sleeve (8) achieves helical rotation, thereby enabling the main support (3) to move forward and complete the cotter pin striking action. Conversely, when the retraction button (14) is working, the servo motor (18) reverses, and the output end of the servo motor (18) is interference-fitted with the lead screw (7), driving the lead screw (7) to reverse. The lead screw (7) and the lead screw sleeve (8) achieve helical rotation, thereby enabling the main support (3) to move backward until the servo motor (18) retracts to the number of rotations of the rotation sensor (23), and the main support (3) returns to its initial position. The microcontroller (19), controller (21), rotation sensor (23), and strain gauge (24) are control command components.

2. The forging tool as described in claim 1, characterized in that, The left working arm (1) and right working arm (2) are made of tungsten steel. The working part is blade-shaped and directly acts on the tail of the cotter pin to press it into the nut groove during operation.

3. The forging tool as described 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 values ​​of the strain gauge (24) and the forward and reverse rotation of the servo motor (18).

4. The forging tool as described in claim 1 or 2, characterized in that, The strain gauge (24) is attached to the side end of the left working arm (1) and the right working arm (2). When the strain gauge (24) reaches the set value, it indicates that the left working arm (1) and the right working arm (2) have completed the cotter pin making. The signal will be transmitted to the microcontroller (19). After processing, the drive controller (21) will issue a retraction command. The retraction rotation sensor (23) will collect the number of forward selection rotations to complete one cotter pin making.

5. The forging tool as described in claim 1 or 2, characterized in that, The power module (20) and the charging module (22) enable the charging and discharging of the power module (20) and the storage of electrical energy.

6. A method of using the forging tool according to any one of claims 1-5, characterized in that, The steps are as follows: Step 1: Initial bending; Select a cotter pin of the appropriate specification, trim the length of the cotter pin according to the nut model of the nut workpiece, then insert the trimmed cotter pin into the cylindrical pin of the nut workpiece, and pry open the two cotter pin protrusions outside the nut workpiece so that the included angle between the two protrusions is 120°. Step 2: Debugging tools; Press the tool power button (17). After the screen of the display (9) lights up and displays the fixing bolts, the tool will enter the preparation stage and the debugging will be completed. 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 cotter pin that are at a 120° angle, and make the lead screw (7) of the forging tool coincide with the bisector of the angle between the opening of the cotter pin, so as to ensure that the two remaining legs are bent and snapped in sync. The preparation for forging is complete. Step 4: Making operation; After all preparations are correct, press the forward button (13), the servo motor (18) rotates forward, and the output end of the servo motor (18) is interference-fitted with the lead screw (7) to drive the lead screw (7) to rotate forward. The lead screw (7) and the lead screw sleeve (8) achieve helical rotation, and the forward movement of the left working arm (1) and the right working arm (2) driven by the main support (3) is completed. 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 cotter pin making operation is completed. Step 5: Disengage from work; Press the retraction button (14), the lead screw (7) begins to rotate counterclockwise, the left working arm (1) and the right working arm (2) begin to move under the action of the spiral rotation, and then complete the retraction work; disengage from the work point from the punching tool, and the work is completed.

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