A method for processing flanged holes at the bottom of a rocket propellant tank

Abstract

This invention belongs to the field of launch vehicle technology and relates to a method for flanging the protruding holes on the bottom of rocket propellant tanks. By monitoring the processing position of the propellant tank bottom, the center lines of the pre-made hole, punch, and die are aligned. Real-time tracking of the heating temperature of the propellant tank bottom prevents deformation caused by excessively high or low temperatures. A state monitoring system ensures the stamping process is performed in two steps, controlling the progress and time, thus improving the flanging strength of the protruding holes on the bottom of the propellant tank. By first lowering the guide rod to near the position of the protruding hole on the bottom of the propellant tank before using a short-stroke electric cylinder for stamping, the stroke of the electric cylinder can be reduced, effectively avoiding damage and quality problems caused by uneven force due to excessively long cylinder rods in existing technologies. The method of this invention provides high precision flanging of the protruding holes, saves time and labor, and ensures the quality of the protruding holes.

Description

Technical Field

[0001] This invention belongs to the field of launch vehicle technology and relates to a method for processing the flanged convex hole at the bottom of a rocket propellant tank. Background Technology

[0002] The civilian aerospace field is gradually taking off and reaching a certain scale, and launch vehicles are also experiencing an unprecedented leap in development, which has a broad and in-depth promoting effect on their experimental research. Among them, the propellant tank is an important component of the launch vehicle, and it is also the largest and most critical structural component in the rocket body structure. The forming of the tank bottom is relatively more complex, and its forming process has received special attention. The tank bottom end cap is a major component of the front and rear bottom of the launch vehicle propellant tank.

[0003] However, the flanged convex holes on the end caps are currently characterized by high forming difficulty and numerous influencing parameters. Existing processing methods suffer from low precision and are time-consuming and labor-intensive, failing to meet the requirements for flanged convex holes on the bottom of storage tanks. Therefore, an effective method for controlling the flanged forming process of convex holes is urgently needed, becoming a key technology in the aerospace field. Summary of the Invention

[0004] The technical solution adopted by this invention to solve the technical problem is: a method for processing the flanged convex hole at the bottom of a rocket propellant tank, comprising the following steps:

[0005] Step 1: Position the bottom of the storage tank on the positioning device, aligning the pre-drilled hole on the bottom of the storage tank with the center lines of the punch and die. The positioning device is a support system with three claws facing upwards. Each claw is equipped with a horizontal electric cylinder that slides back and forth horizontally and a vertical electric cylinder that slides back and forth vertically. The top of the telescopic end of the vertical electric cylinder is fixedly connected to a support plate. The support system is fixedly connected to the upper surface of the base. The star-shaped support system evenly distributed around the bottom of the storage tank supports and positions the bottom of the storage tank.

[0006] Step 2: Use a position monitoring device to monitor whether the bottom of the storage tank is accurately positioned, and reconfirm whether the center lines of the pre-drilled hole, punch, and die are aligned.

[0007] Step 3: Clamp the bottom of the storage tank from top to bottom onto the die worktable that is flush with the upper surface of the die using a clamping device, so that the outer convex surface of the storage tank bottom is in close contact with the die worktable, and the outer circumference of the pre-drilled hole of the storage tank bottom is in close contact with the upper surface of the die. The clamping device is a mechanical clamping or an electromagnetic clamping, pressing the bottom of the storage tank onto the lower part of the convex hole from top to bottom.

[0008] Step 4: The head of the stamping device is vertically lowered to directly above the pre-drilled hole at the bottom of the storage tank by the upper frame of the stamping device and the stamping position is maintained; the structural support of the stamping device is erected on the base in the shape of a gantry frame, and a guide rod is fixed on the frame of the structural support. The guide rod reciprocates in the vertical direction, and the head of the telescopic rod is connected to the punch. The punch is driven by the guide rod to fall and stop directly above the pre-drilled hole.

[0009] Step 5: Use a heating device surrounding the outer circumference of the concave mold to heat the area around the pre-drilled hole at the bottom of the storage tank;

[0010] Step Six: Start the stamping device. The electric cylinder drives the punch to punch the pre-drilled hole on the bottom of the tank in a short stroke. The stamping process is divided into two stages. The first stage is from the start to 1 / 3 to 1 / 2 of the stroke. The second stage is from the end of the first stage stroke to the end of the stroke. There is a pause of 15 to 30 seconds between the two stages. The punch moves down to punch, and works with the die to divide the entire stamping process into two stages to ensure that the metal around the pre-drilled hole on the bottom of the tank is subjected to uniform stress and to allow sufficient time for the metal tensile stress to be released.

[0011] Step 7: Demolding. During demolding, use a punch pad to press the flanged area of ​​the protruding hole on the bottom of the storage tank. Then, the electric cylinder drives the punch to slowly rise and move away. After the punch is completely removed from the flanged area of ​​the protruding hole on the bottom of the storage tank, remove the punch pad to prevent the bottom of the storage tank from deforming inward during demolding. After stamping, the bottom of the storage tank is first pressed and fixed by the punch pad and the upper end face of the die. Then, the punch is withdrawn upward from the reserved hole of the punch pad to prevent the protruding hole on the bottom of the storage tank from being concave upward due to the withdrawal of the punch.

[0012] Step 8: Loosen the clamping device so that the bottom of the storage tank is no longer clamped to the die worktable. Raise the positioning device to lift the bottom of the storage tank up and detach it from the die worktable. At the same time, tap and vibrate the die to detach the bottom of the storage tank from the die, thus completing the flange of the convex hole.

[0013] Preferably, in step six, the stamping is a uniform low-speed stamping.

[0014] Preferably, in step two, when the position monitoring device monitors whether the bottom of the storage tank is accurately positioned, it uses a buzzer to indicate that the tank is in place. When the bottom of the storage tank reaches the accurate processing position, the buzzer alarm indicates that the tank is in place.

[0015] Preferably, in step five, when the heating device heats the area around the pre-drilled holes at the bottom of the storage tank, a temperature monitoring system is used to monitor the heating temperature of the bottom of the storage tank in real time. When the heating temperature reaches the threshold, the temperature monitoring system will sound an alarm via a buzzer.

[0016] Preferably, in step four, the stamping device lowers the head of the stamping device vertically to the height of the punch's stroke range via an electrically controlled slide rail and then locks the vertical position of the stamping device.

[0017] Preferably, in step six, the status monitoring system monitors the stamping process and stamping time to ensure that the stamping process is carried out in two stages and meets the stroke of each stamping process and the dwell time between the two stamping stages.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention achieves alignment of the center lines of the pre-made hole, punch, and die by monitoring the processing position of the bottom of the storage tank.

[0020] 2. This invention avoids deformation of the tank bottom due to excessively high or low temperatures by real-time tracking of the tank bottom heating temperature.

[0021] 3. The status monitoring system of this invention ensures that the stamping process is carried out in two steps and pauses for 15 to 30 seconds between 1 / 3 and 1 / 2 of the process, thereby improving the strength of the flange of the protrusion at the bottom of the storage tank.

[0022] 4. This invention uses a mechanical processing method, which, compared to electromagnetic processing, can achieve the processing of multi-size and large-size box bottom convex hole flanges.

[0023] 5. The present invention reduces the stroke of the upper electric cylinder by first lowering the guide rod to a position close to the bottom protrusion of the storage tank and then using the upper electric cylinder of the protrusion for short-distance punching. This effectively avoids the damage and quality problems caused by uneven force due to the excessive length of the upper electric cylinder rod in the prior art.

[0024] 6. This invention can work around the clock, which not only improves work efficiency but also reduces human error and improves accuracy. It can significantly reduce working time, save manpower, and greatly improve work efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the steps of a method for flanging the bottom protrusions of a rocket propellant tank.

[0026] Figure 2 This is a schematic diagram of the machining tooling for the flanging process;

[0027] Figure 3 It is a diagram of flange pressing;

[0028] Figure 4 This is a schematic diagram of the support system;

[0029] Figure 5 This is a schematic diagram of a convex hole device.

[0030] In the diagram, 1. Base; 2. Structural support; 3. Support system; 4. Protrusion hole device; 5. Control cabinet; 6. Clamping device; 7. Storage tank bottom; 21. Guide rod; 31. Horizontal electric cylinder; 32. Vertical electric cylinder; 33. Support frame; 34. Support plate; 35. Rubber pad; 41. Upper part of protrusion hole; 42. Lower part of protrusion hole; 411. Punch; 412. Upper electric cylinder of protrusion hole; 413. Punch pad; 421. Die; 422. Lower electric cylinder of protrusion hole; 423. Heating device; 424. Guide pin; 425. Lower electric cylinder bracket; 426. Pin hole. Detailed Implementation

[0031] The related technologies of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] refer to Figures 1-5 A method for processing the flanged hole of the bottom of a rocket propellant tank, step one: the bottom of the propellant tank is positioned on the positioning device so that the pre-made hole of the bottom of the propellant tank is aligned with the center line of the punch and the die; the positioning device is a support system 3, the support system 3 has three claws with the opening facing upward, each claw is equipped with a horizontal electric cylinder 31 that slides back and forth in the horizontal direction and a vertical electric cylinder 32 that slides back and forth in the vertical direction, the top of the telescopic end of the vertical electric cylinder 32 is fixedly connected to a support plate 34, the support system 3 is fixedly connected to the upper surface of the base 1, and the support system 3, which is evenly distributed in a star shape, supports and positions the bottom of the propellant tank 7;

[0033] Step 2: Use a position monitoring device to monitor whether the bottom of the storage tank is accurately positioned, and reconfirm whether the center lines of the pre-drilled hole, punch, and die are aligned.

[0034] Step 3: The bottom of the storage tank is clamped from top to bottom onto the die worktable that is flush with the upper surface of the die using the clamping device, so that the outer convex surface of the storage tank bottom is in close contact with the die worktable, and the outer circumference of the pre-drilled hole of the storage tank bottom is in close contact with the upper surface of the die. The clamping device 6 is a mechanical clamping or electromagnetic clamping, pressing the bottom of the storage tank 7 onto the lower part 42 of the convex hole from top to bottom.

[0035] Step 4: The head of the stamping device is vertically lowered to directly above the pre-drilled hole at the bottom of the storage tank by the upper frame of the stamping device and the stamping position is maintained; the structural support 2 of the stamping device is erected on the base 1 in the shape of a gantry frame. A guide rod 21 is fixed on the frame of the structural support 2. The guide rod 21 reciprocates in the vertical direction. The head of the telescopic rod of the guide rod 21 is connected to the punch 411. The punch 411 is driven by the guide rod 21 to fall and stop directly above the pre-drilled hole.

[0036] Step 5: Use a heating device surrounding the outer circumference of the concave mold to heat the area around the pre-drilled hole at the bottom of the storage tank;

[0037] Step Six: Start the stamping device. The electric cylinder drives the punch to punch the pre-made holes on the bottom of the storage tank in a short stroke. The stamping process is divided into two stages. The first stage is from the start to 1 / 3 to 1 / 2 of the stroke. The second stage is from the end of the first stage stroke to the end of the stroke. There is a pause of 15 to 30 seconds between the two stages. The punch 411 moves down to punch, and cooperates with the die 421 to divide the entire stamping process into two stages to ensure that the metal around the pre-made holes on the bottom of the storage tank is subjected to uniform force and to allow sufficient time for the release of metal tensile stress.

[0038] Step 7: Demolding. During demolding, a punch pad is used to press the flanged area of ​​the protruding hole on the bottom of the storage tank. Then, the electric cylinder drives the punch to slowly rise and leave. After the punch is completely removed from the flanged area of ​​the protruding hole on the bottom of the storage tank, the punch pad is removed to prevent the bottom of the storage tank from deforming inward during demolding. After stamping, the bottom of the storage tank 7 is first pressed and fixed by the upper end face of the punch pad 413 and the die 421. Then, the punch 411 is withdrawn upward from the reserved hole of the punch pad 413 to prevent the protruding hole of the bottom of the storage tank 7 from being concave upward due to the withdrawal of the punch 411.

[0039] Step 8: Loosen the clamping device so that the bottom of the storage tank is no longer clamped to the die worktable. Raise the positioning device to lift the bottom of the storage tank up and detach it from the die worktable. At the same time, tap and vibrate the die to detach the bottom of the storage tank from the die, thus completing the flange of the convex hole.

[0040] Furthermore, in step six, the stamping is a uniform low-speed stamping.

[0041] Furthermore, in step two, when the position monitoring device monitors whether the bottom of the storage tank is accurately positioned, it uses a buzzer to indicate that the tank is in place when the bottom of the storage tank reaches the accurate processing position.

[0042] Furthermore, in step five, when the heating device heats the area around the pre-drilled holes at the bottom of the storage tank, a temperature monitoring system is used to monitor the heating temperature of the bottom of the storage tank in real time. When the heating temperature reaches the threshold, the temperature monitoring system will sound an alarm via a buzzer.

[0043] Furthermore, in step four, the stamping device lowers its head vertically to the height of the punch's stroke range via an electrically controlled slide rail and then locks the vertical position of the stamping device.

[0044] Furthermore, in step six, the status monitoring system monitors the stamping process and stamping time to ensure that the stamping process is carried out in two stages and meets the requirements of the stroke of each stamping process and the dwell time between the two stamping stages.

[0045] Example

[0046] This embodiment uses a tooling for flanged flanges with protruding holes on the bottom of a rocket propellant tank. This tooling includes: a base 1, a structural support 2, a support system 3, a protruding hole device 4, and a control cabinet 5. The base 1 is a rectangular platform. The structural support 2 is vertically and fixedly connected to the upper surface of the base 1 in a gantry-like shape. A guide rod 21 is fixedly connected to the frame of the structural support 2. The guide rod 21 is a telescopic rod that can reciprocate vertically. The fixed part of the guide rod 21 is fixedly connected to the structural support 2. The support system 3 is a three-claw-shaped sliding support device with an upward opening. The support system 3 is fixedly connected to the upper surface of the base 1. The protruding hole device 4 is divided into an upper protruding hole 41 and a lower protruding hole 42. The lower protruding hole 42 is fixedly connected to the upper surface of the base 1, and the upper protruding hole 41 is connected to the telescopic rod head of the guide rod 21. The tooling also includes a clamping device 6, which is used to press the bottom of the propellant tank 7 onto the lower protruding hole 42 from top to bottom. The clamping device 6 includes mechanical clamping and electromagnetic clamping.

[0047] The three claws of the support system 3 include a horizontal electric cylinder 31, a vertical electric cylinder 32, and a support frame 33. The telescopic end of the horizontal electric cylinder 31 slides back and forth in the horizontal direction, and the telescopic end of the vertical electric cylinder 32 slides back and forth in the vertical direction. The fixed part of the horizontal electric cylinder 31 is fixedly connected to the base 1, and the telescopic end of the horizontal electric cylinder 31 is fixedly connected to the bottom of the support frame 33. The fixed end of the vertical electric cylinder 32 is fixedly connected to the support frame 33, and a support plate 34 is fixedly connected to the top of the telescopic end of the vertical electric cylinder 32. The three claws of the support system 3 are evenly distributed in a star shape around the lower part 42 of the convex hole. The extension lines of the telescopic ends of the horizontal electric cylinder 31 intersect at the lower part 42 of the convex hole. The support surface of the support plate 34 is arc-shaped, and the arc-shaped concave surface of the support plate 34 faces the lower part 42 of the convex hole. A rubber pad 35 is provided in the arc-shaped concave surface of the support plate 34. The rubber pad 35 is used to elastically support the bottom 7 of the storage tank, providing better support stability.

[0048] The upper part 41 of the convex hole is provided with a punch 411, the convex surface of the punch 411 is vertically downward, the punch 411 is detachably connected to the movable end of the upper electric cylinder 412 of the convex hole, the fixed end of the upper electric cylinder 412 of the convex hole is fixedly connected to the telescopic rod head of the guide rod 21, the lower part 42 of the convex hole is provided with a die 421, the concave surface of the die 421 is vertically upward, the die 421 is fixedly connected to the movable end of the lower electric cylinder 422 of the convex hole, the fixed end of the lower electric cylinder 422 of the convex hole is fixedly connected to the base 1, the telescopic directions of the upper electric cylinder 412 and the lower electric cylinder 422 of the convex hole are vertical and collinear, and the pressing surfaces of the punch 411 and the die 421 match each other.

[0049] A heating device 423 is horizontally surrounded on the outer ring of the die 421. The heating device 423 is electrically connected to the control cabinet 5. The heating device 423 preheats the stamping position of the tank bottom 7 locally, so that the tank bottom 7 is stamped after heating, and a better stamping effect is achieved.

[0050] A cylindrical punch pad 413 is provided around the outer ring of the punch 411. The punch pad 413 is fixedly connected to the telescopic rod head of the guide rod 21. When the punch 411 is stamped, it extends out from the reserved hole of the punch pad 413 and retracts. The punch 411 and the punch pad 413 rotate on the same axis. The lower end face of the punch pad 413 and the upper end face of the die 421 mesh and match during stamping. After stamping, the bottom of the storage tank 7 is first pressed and fixed by the cooperation of the punch pad 413 and the upper end face of the die 421. Then, the punch 411 is withdrawn upward from the reserved hole of the punch pad 413 to prevent the protrusion of the bottom of the storage tank 7 from being concave upward due to the withdrawal of the punch 411.

[0051] The bottom of the die 421 is provided with a guide pin 424 with a vertical guiding direction, and the lower part 42 of the protrusion is provided with a lower electric cylinder bracket 425. The lower electric cylinder bracket 425 is fixedly connected to the base 1. The guide pin 424 is inserted into the pin hole 426 on the upper surface of the lower electric cylinder bracket 425. The lower electric cylinder 422 of the protrusion passes vertically through the upper surface of the lower electric cylinder bracket 425. The guide pin 424 and the pin hole 426 can ensure that the pressing surface of the die 421 is kept horizontal and provide better stability.

[0052] Guide rod 21, horizontal electric cylinder 31, vertical electric cylinder 32, upper electric cylinder 412 with protruding hole, and lower electric cylinder 422 with protruding hole are all electrically connected to the control cabinet 5.

[0053] The support system 3 can be adjusted to the corresponding position according to the different sizes and specifications of the tank bottom 7, so as to quickly support and clamp the tank bottom 7. At the same time, the punch 411 of the upper part 41 of the punch hole and the die 421 of the lower part 42 of the punch hole can be replaced according to the different specifications of the punch hole forming requirements of different tank bottom 7. When processing the punch hole, the die 421 is pressed tightly against the lower part of the hole of the tank bottom 7, and the upper electric cylinder 412 of the punch hole is activated to slowly press down the punch 411. At the same time, the lower electric cylinder 422 of the punch hole can be activated to press down on both sides at the same time to ensure the horizontal position of the tank bottom 7 and prevent the tank bottom 7 from being deformed and damaged due to only the upper electric cylinder 412. During processing, the pre-punching is performed at a low punching speed, and the punching is completed in multiple times. After holding for a period of time, the punch 411 and die 421 are withdrawn.

[0054] When processing the flanged hole at the bottom of the rocket propellant tank, firstly, the propellant tank bottom 7 is positioned and placed on the positioning device support system 3, aligning the pre-drilled hole of the propellant tank bottom 7 with the center lines of the punch 411 and the die 421; secondly, a position monitoring device is used to monitor the accuracy of the positioning of the propellant tank bottom 7, and to reconfirm whether the pre-drilled hole is aligned with the center lines of the punch 411 and the die 421; thirdly, the propellant tank bottom 7 is clamped from top to bottom onto the upper surface of the die 421 using the clamping device 6. The fourth step involves lowering the guide rod 21 to a position close to the protruding hole on the bottom of the storage tank 7, ensuring that the punch 411 at the front end of the electric cylinder 412 on the protruding hole is aligned with the pre-drilled hole and maintains the stamping position. At this time, the distance between the punch 411 and the pre-drilled hole is sufficient for the stroke of the electric cylinder 412 on the protruding hole to complete the stamping of the punch 411 and the die 421. The fifth step involves activating the heating device 423 to locally preheat the stamping part of the bottom of the storage tank 7 that requires the protruding hole, and monitoring the temperature in real time through the temperature monitoring system. The heating temperature of the bottom 7 of the storage tank is measured. When the heating temperature reaches the threshold, the temperature monitoring system will sound an alarm via a buzzer. The sixth step is stamping. The upper electric cylinder 412 of the punch is activated, causing the punch 411 to slowly press down. The stamping process is carried out in two stages: the first stage stroke is from the start to 1 / 3 to 1 / 2 of the stroke, and the second stage is from the end of the first stage stroke to the complete end of the stroke. The two stages are paused for 15 to 30 seconds. The seventh step is demolding. The punch pad 413 and the die 4... The upper end face of 21 is first pressed and fixed to the bottom of the storage tank 7. Then, the punch 411 is withdrawn upward from the reserved hole of the punch pad 413 to prevent the bottom of the storage tank 7 from being concave upward due to the withdrawal of the punch 411. In the eighth step, the clamping device 6 is released so that the bottom of the storage tank 7 is no longer clamped on the die worktable. The support system 3 is raised to lift the bottom of the storage tank 7 and remove it from the die worktable. At the same time, the die 421 is struck and vibrated to remove the bottom of the storage tank 7 from the die 421, thus completing the convex hole flanging.

[0055] In summary, this invention provides a method for flanging the protruding holes on the bottom of rocket propellant tanks. By monitoring the processing position of the tank bottom, the center lines of the pre-formed hole, punch, and die are aligned. Real-time tracking of the tank bottom heating temperature prevents deformation caused by excessively high or low temperatures. A state monitoring system ensures the stamping process is performed in two steps, with a pause of 15 to 30 seconds between 1 / 3 and 1 / 2 of the process, improving the flanging strength of the protruding holes. By first lowering the guide rod to near the protruding hole position before using the small-stroke electric cylinder for stamping, the stroke of the electric cylinder is reduced, effectively avoiding damage and quality problems caused by uneven force distribution due to excessively long cylinder rods in existing technologies. Therefore, this invention offers high precision, saves time and labor, and guarantees the quality of the protruding holes, thus possessing broad application prospects.

[0056] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method of flanging a rocket tank bottom hole, characterized by: It comprises the following steps: Step one: position the tank bottom on the positioning device, so that the preformed hole of the tank bottom is aligned with the center line of the punch, the die and the convex die cushion; the outer circle of the punch is surrounded by a cylindrical convex die cushion, the punch extends from the reserved hole of the convex die cushion during stamping, the punch and the convex die cushion have the same rotation axis, and the lower end surface of the convex die cushion is engaged with the upper end surface of the die during stamping; Step two: use the position monitoring device to monitor whether the tank bottom is positioned accurately, and confirm again whether the preformed hole is aligned with the center line of the punch, the die and the convex die cushion; Step three: clamp the tank bottom from top to bottom on the die working table which is flush with the upper surface of the die, so that the outer convex surface of the tank bottom is in close contact with the die working table, and the outer circumference of the preformed hole of the tank bottom is in close contact with the upper surface of the die; Step four: vertically lower the head of the stamping device to the top of the preformed hole of the tank bottom by the upper frame of the stamping device and keep the stamping position; Step five: heat the surrounding of the preformed hole of the tank bottom by the heating device surrounding the outer circumference of the die; Step six: start the stamping device, the electric cylinder drives the punch to stamp the preformed hole of the tank bottom at close range and short stroke, the stamping process is divided into two stages, the first stage is from the beginning to 1 / 3 to 1 / 2 of the process, the second stage is from the stop of the first stage to the end of the process, and the stay time between the two stages is 15 to 30 seconds; Step seven: demolding, when demolding, the convex die cushion is used to press the convex hole flanging of the tank bottom, then the electric cylinder drives the punch to slowly rise and leave, after the punch completely leaves the convex hole flanging of the tank bottom, the convex die cushion is removed to prevent the tank bottom from deforming inward during demolding; Step eight: loosen the clamping device, so that the tank bottom is no longer clamped on the die working table, the positioning device is raised to lift the tank bottom away from the die working table, and the die is knocked and vibrated to make the tank bottom separate from the die, and the convex hole flanging is completed.

2. The method of claim 1, wherein, In step six, the stamping is uniform and low speed.

3. The method of claim 1, wherein, In step two, when the position monitoring device monitors whether the tank bottom is positioned accurately, a buzzer is used for prompting, and the tank bottom is placed in position when the buzzer prompts that the tank bottom reaches the accurate processing position.

4. The method of claim 1, wherein, In step five, when the heating device heats the surrounding of the preformed hole of the tank bottom, a temperature monitoring system is used to monitor the heating temperature of the tank bottom in real time, and the temperature monitoring system alarms by a buzzer when the heating temperature reaches a threshold value.

5. The method of claim 1, wherein, In step four, the stamping device vertically lowers the head of the stamping device to the stroke range height of the punch by electric control sliding rail, and locks the position of the vertical direction of the stamping device.

6. The method of claim 1, wherein, In step six, the state monitoring system monitors the stamping process and stamping time to ensure that the stamping process is carried out twice and meets the stroke of each stamping process and the stay time between the two stamping processes.

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