Bottom pit forging device for round shell stretch product

Abstract

The application provides a round shell stretching product bottom sunken platform forging device and relates to the field of lithium battery shell forging processing technology.The device comprises a rack, a feeding box arranged at the left end of the rack, a sliding box arranged at the middle part of the rack, a hydraulic cylinder arranged between the rack and the sliding box and used for pushing the sliding box to move leftward and rightward, and a forging barrel mechanism arranged at the end of the sliding box close to the feeding box and used for forging the round shell in the feeding box.Compared with the forging method of directly pressing the male die by using the hydraulic device, the round shell stretching product bottom sunken platform forging device can achieve better forging effect without high-precision control of the stroke of the hydraulic cylinder, avoids excessive forging force, and can adjust the forging force of the male die rod on the forged piece by rotating the screw rod, so that the forging force can be adjusted according to the round shell with different materials and thicknesses, the forging force can be prevented from being too large or too small, and the forming quality of the round shell bottom sunken platform is ensured.

Description

Technical Field

[0001] This invention relates to the field of lithium battery casing forging technology, specifically to a bottom sinking forging device for round shell stretching products. Background Technology

[0002] Lithium-ion battery casings are mainly available in prismatic and round shapes. Round aluminum lithium-ion battery casings are formed by stretching a blank material into a cylindrical shape with a closed bottom and an open top. To meet the requirements of cell assembly, a recessed platform is machined at the bottom. This platform provides a precise mounting reference for the cell, ensuring it is centered within the casing and avoiding interference with the casing's sidewalls and corners. This also guarantees the relative positional accuracy of the cell with components such as terminals and separators. This application mainly applies to round lithium-ion battery casings, specifically for forging the bottom of the round casing to form a recessed platform.

[0003] In the forging process of the bottom countersunk platen of a cylindrical shell, a punch needs to be inserted into the interior of the cylindrical shell, then the bottom wall of the cylindrical shell is pressed tightly against the die, and a hydraulic device is used to directly press the punch, forming the countersunk platen on the bottom wall of the cylindrical shell. However, due to the limited stroke accuracy of the hydraulic device (hydraulic cylinder) and the influence of hydraulic oil temperature changes, it is difficult to control the stroke of the hydraulic cylinder with high precision. When the hydraulic device presses the punch, it is easy to cause excessive or insufficient force, thus affecting the forming quality of the countersunk platen. In particular, when the pressure is too high, it is easy to cause secondary stretching of the bottom wall of the cylindrical shell, causing the bottom wall of the cylindrical shell to be thinned again, resulting in an abnormal wavy edge of the bottom wall, affecting the yield rate. Therefore, we propose a forging device for the bottom countersunk platen of cylindrical shell stretching products to solve the above problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A bottom forging device for a round shell stretching product includes a frame and a feeding box located at the left end of the frame. A sliding box is slidably arranged in the middle of the frame. A hydraulic cylinder for pushing the sliding box to move left and right is installed between the frame and the sliding box. A forging cylinder mechanism for forging the round shell in the feeding box is installed at the end of the sliding box near the feeding box.

[0005] The forging cylinder mechanism includes a cylinder, with a cylinder cap threaded onto the left end of the cylinder and a cylinder seat fixed to the right end of the cylinder, and the cylinder seat is fixedly connected to the slide box.

[0006] A sliding column is slidably arranged inside the cylinder. A limiting ring is slidably sleeved on the outer surface of the sliding column, and the limiting ring is fixedly sleeved on the inner wall of the cylinder. A return spring is arranged between the sliding column and the limiting ring. A punch rod is fixed to the left end of the sliding column, and the punch rod slides through the cylinder cover to its left side. A support rod is fixed to the right end of the sliding column.

[0007] The inner wall of the cylinder is provided with a keyway, and a key bar is fixed at the edge of the sliding column, and the key bar is slidably disposed inside the keyway.

[0008] A stamping block is slidably disposed inside the cylinder. The stamping block has an axially penetrating circular slot in the middle, and the diameter of the circular slot is larger than the diameter of the support rod. The stamping block also has square slots arranged in a circumferential array about its axis in the middle. A stop block is hinged inside each square slot. A leaf spring is disposed between the left end of the stop block and the stamping block. A limiting block is disposed inside the square slot to block the right end of the stop block.

[0009] A compression spring is provided between the stamping block and the cylinder seat. A screw is threadedly connected to the middle of the cylinder seat. A sliding hole is provided at the left end of the screw to accommodate the sliding of the support rod. The left end of the screw is slidably sleeved inside the circular slot. A stop ring for limiting the position of the stamping block is fixedly sleeved on the inner wall of the cylinder.

[0010] Specifically, a flat plate is fixed inside the feeding box, and a servo motor is fixedly installed on the bottom surface of the flat plate. The rotating shaft of the servo motor passes through the top of the flat plate and is fixed with connecting seats arranged in an equidistant circular array. A material rod is fixed at the ends of the multiple connecting seats that are far apart from each other.

[0011] The bottom surface of the connecting seat is provided with an air guide groove, and the inside of the material rod is provided with an air guide hole that communicates with the air guide groove. A die head is fixed at the end of the material rod away from the connecting seat, and the outer surface of the die head is provided with multiple air outlet holes that communicate with the air guide hole.

[0012] The plate has a vent hole corresponding to the position of the air guide groove. A solenoid valve is fixed on the bottom surface of the plate. The input end of the solenoid valve is connected to an external high-pressure air tank, and the output end of the solenoid valve is connected to the vent hole.

[0013] Furthermore, the outer surface of the feed rod is provided with multiple strip grooves, and arc-shaped spring pieces are installed inside the strip grooves.

[0014] The feeding box contains a raw material box for placing the round shells to be processed. A pneumatic push rod is installed on the outer surface of the feeding box. The pneumatic push rod is used to push the round shells in the raw material box toward the material rods, so that the round shells are fitted onto the outside of one of the material rods.

[0015] Compared with existing technologies, the bottom sinker forging device for this round shell stretching product has the following advantages: This forging device for the bottom of a cylindrical shell stretching product utilizes a forging cylinder mechanism. During the forging process, a hydraulic cylinder pushes the forging cylinder mechanism to the left, compressing and storing force in the spring until the left end of the screw moves between multiple stop blocks. The left ends of these stop blocks are then opened, preventing them from abutting against the right end of the support rod. At this point, the stamping block is released, no longer obstructed by the support rod, and moves rapidly to the left, striking the right end of the sliding column. This, in turn, forges the forging through the punch rod. Compared to forging methods that directly apply pressure to the punch using a hydraulic device, this device achieves better forging results without requiring high-precision control of the hydraulic cylinder's stroke, thus avoiding excessive forging force.

[0016] Furthermore, in the forging cylinder mechanism, rotating the screw adjusts the position of its left end within the cylinder, thereby adjusting the release position of the stamping block. This adjusts the compression force of the spring when the stamping block is released, which in turn adjusts the impact force of the stamping block on the sliding column, and consequently, the forging force of the punch rod on the forging workpiece. This allows for adjusting the forging force according to different materials and thicknesses of the cylindrical shell, preventing excessive or insufficient forging force, ensuring the forming quality of the bottom countersink of the cylindrical shell, and improving the yield rate.

[0017] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram from the front view of the present invention; Figure 2 This is a three-dimensional structural diagram of the invention from a rear-view perspective; Figure 3 This is a schematic diagram of the internal structure of the frame and the feeding box in this invention. Figure 1 ; Figure 4 This is a schematic diagram of the internal structure of the frame and the feeding box in this invention. Figure 2 ; Figure 5 This is a top cross-sectional view of the feeding box in this invention; Figure 6 This is a three-dimensional structural diagram of the forging cylinder mechanism in this invention; Figure 7 This is a cross-sectional view of the forging cylinder mechanism and the slide box in this invention. Figure 1 ; Figure 8 This is a schematic diagram of the internal structure of the forging cylinder mechanism in this invention. Figure 1 ; Figure 9 This is a schematic diagram of the internal structure of the forging cylinder mechanism in this invention. Figure 2 ; Figure 10 For the present invention Figure 9 Enlarged view of a local structure in the image; Figure 11 This is a partial cross-sectional view of the forging cylinder mechanism in this invention; Figure 12 This is a front sectional view of the forging cylinder mechanism in this invention; Figure 13 This is a schematic diagram showing the state of the internal components of the forging cylinder mechanism during the forging process of the present invention, when the left end of the punch rod is not in contact with the forging. Figure 14 This is a schematic diagram illustrating the state of the internal components of the forging cylinder mechanism during the forging process of this invention, when the left end of the punch rod contacts the forging. Figure 1 ; Figure 15 This is a schematic diagram illustrating the state of the internal components of the forging cylinder mechanism during the forging process of this invention, when the left end of the punch rod contacts the forging. Figure 2 ; Figure 16 This is a schematic diagram illustrating the state of the internal components of the forging cylinder mechanism during the forging process of this invention, when the left end of the punch rod contacts the forging. Figure 3 ; Figure 17 This is a schematic diagram of the internal structure of the feeding box in this invention. Figure 1 ; Figure 18 This is a schematic diagram of the internal structure of the feeding box in this invention. Figure 2 ; Figure 19 This is a schematic diagram of the internal structure of the feeding box in this invention. Figure 3 ; Figure 20 This is a cross-sectional view of the internal structure of the feeding box in this invention. Figure 1 ; Figure 21 For the present invention Figure 20 Enlarged view of the structure at point A in the image; Figure 22 This is a cross-sectional view of the connecting seat and the material rod in this invention; Figure 23 For the present invention Figure 22 Enlarged view of the structure at point B in the image.

[0019] In the picture: 1. Frame; 2. Carriage box; 3. Hydraulic cylinder; 4. Forging cylinder mechanism; 41. Cylinder; 411. Cylinder cover; 412. Cylinder base; 413. Stop ring; 414. Keyway; 42. Sliding column; 43. Limiting ring; 44. Return spring; 45. Punch rod; 46. Support rod; 47. Stamping block; 471. Round slot hole; 472. Square slot hole; 473. Stop block; 474. Leaf spring; 475. Limiting block; 48. Compression spring; 49. Screw; 5. Feeding box; 51. Flat plate; 511. Vent hole; 52. Servo motor; 53. Connector; 531. Air guide groove; 54. Material rod; 541. Air guide hole; 542. Die head; 5421. Air outlet hole; 543. Strip groove; 544. Arc-shaped spring sheet; 55. Solenoid valve; 56. Raw material bin; 57. Pneumatic actuator; 58. Storage box; 59. Punching hole 6. Round shell. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0021] Please see Figures 1 to 23 The present invention provides the following implementation scheme: a bottom sinking forging device for a round shell stretching product, including a frame 1 and a feeding box 5 disposed at the left end of the frame 1.

[0022] A sliding box 2 is slidably arranged in the middle of the frame 1. A hydraulic cylinder 3 for pushing the sliding box 2 to move left and right is installed between the frame 1 and the sliding box 2. A forging cylinder mechanism 4 for forging the round shell 6 inside the loading box 5 is installed at the end of the sliding box 2 near the loading box 5.

[0023] Please refer to this carefully. Figure 6 and Figure 7 The forging cylinder mechanism 4 includes a cylinder 41, with a cylinder cover 411 threaded onto the left end of the cylinder 41 and a cylinder seat 412 fixed to the right end of the cylinder 41, and the cylinder seat 412 is fixedly connected to the slide box 2. When the hydraulic cylinder 3 is working, it can push the slide box 2 and the forging cylinder mechanism 4 to move left and right together.

[0024] Please refer to this carefully. Figures 7-12A sliding column 42 is slidably disposed inside the cylinder 41. A limiting ring 43 is slidably sleeved on the outer surface of the sliding column 42, and the limiting ring 43 is fixedly sleeved on the inner wall of the cylinder 41. A return spring 44 is disposed between the sliding column 42 and the limiting ring 43 to provide elastic potential energy for the sliding column 42 to return to the left. A punch rod 45 is fixed to the left end of the sliding column 42, and the punch rod 45 slides through the cylinder cover 411 to its left side. A punch is disposed at the left end of the punch rod 45, and a support rod 46 is fixed to the right end of the sliding column 42.

[0025] The inner wall of the cylinder 41 is provided with a keyway 414, and a key bar is fixed at the edge of the slide column 42, and the key bar is slidably disposed inside the keyway 414. When the slide column 42 moves linearly inside the cylinder 41, the key bar slides inside the keyway 414, which can prevent the slide column 42 from rotating, and thus prevent the punch rod 45 and the punch at its left end from rotating.

[0026] A stamping block 47 is slidably disposed inside the cylinder 41. An axially penetrating circular slot 471 is provided in the middle of the stamping block 47, and the diameter of the circular slot 471 is slightly larger than the diameter of the support rod 46.

[0027] The stamping block 47 has square slots 472 arranged in a circular array around its axis in the middle. Each square slot 472 has a stop block 473 hinged inside. A leaf spring 474 is provided between the left end of the stop block 473 and the stamping block 47. The spring force of the leaf spring 474 causes the left ends of the multiple stop blocks 473 to move closer together. A limiting block 475 is provided inside the square slots 472 to block the right end of the stop blocks 473. In its natural state, the left ends of the multiple stop blocks 473 move closer together. When the support rod 46 enters the circular slot 471, it can block the right end of the support rod 46.

[0028] A compression spring 48 is provided between the stamping block 47 and the cylinder seat 412. A screw 49 is threadedly connected to the middle of the cylinder seat 412. A sliding hole is provided at the left end of the screw 49 to accommodate the sliding of the support rod 46. The left end of the screw 49 is slidably sleeved inside the circular slot 471. A stop ring 413 for limiting the stamping block 47 is fixedly sleeved on the inner wall of the cylinder 41.

[0029] During the forging process where hydraulic cylinder 3 pushes forging cylinder mechanism 4 to move to the left, and forging of the round shell 6 (forging) in loading box 5: When the left end of the punch rod 45 is not in contact with the forging, the slide rod 42 is subjected to the elastic force of the return spring 44, and its left end abuts against the cylinder cover 411. The stamping block 47 is subjected to the elastic force of the compression spring 48, and its left end abuts against the stop ring 413 (as shown). Figure 13 (as shown) When the left end of the punch rod 45 contacts the forging, i.e., the punch rod 45 is blocked by the forging, the cylinder 41 continues to move to the left, causing the right end of the support rod 46 to insert into the circular slot 471 until the right end of the support rod 46 abuts against the left end of the stop block 473, thus blocking the stamping block 47 and preventing it from moving further to the left. This causes the compression spring 48 to be compressed and stored until the left end of the screw 49 moves between the multiple stop blocks 473, and then opens the left ends of the multiple stop blocks 473 (see reference). Figure 10 (Understanding), so that the left end of the stop block 473 no longer abuts against the right end of the support rod 46 (see reference). Figure 14 and Figure 15 (Understanding), at this point, the stamping block 47 is released without being blocked by the support rod 46. Under the elastic force of the compression spring 48, the stamping block 47 moves rapidly to the left and strikes the right end of the sliding column 42, and forges the forging through the punch rod 45 (see reference). Figure 15 and Figure 16 understand).

[0030] After forging is completed, hydraulic cylinder 3 pulls forging cylinder mechanism 4 to move to the right until the left end of punch rod 45 is no longer in contact with the forging, and the components inside forging cylinder mechanism 4 return to their original positions. Figure 13 The state shown.

[0031] Compared to the forging method that uses a hydraulic device to directly pressurize the punch, the above forging scheme does not require high-precision control of the stroke of the hydraulic cylinder 3, and can still achieve a better forging effect, avoiding excessive forging force.

[0032] Based on the above technical solution and principle, rotating the screw 49 adjusts the position of the left end of the screw 49 inside the cylinder 41, which can adjust the position where the stamping block 47 is released, that is, adjust the compression force of the spring 48 when the stamping block 47 is released. This allows for adjustment of the impact force of the stamping block 47 on the sliding column 42 after it is released, and further adjusts the forging force of the punch rod 45 on the forging. This facilitates the adjustment of the forging force according to the different materials and thicknesses of the round shell, thus avoiding excessive or insufficient forging force, ensuring the forming quality of the bottom sinker of the round shell, and improving the yield rate.

[0033] In addition, when the stamping block 47 is released, the stamping block 47 moves quickly to the left, and the left ends of the multiple stop blocks 473 will slide against the outer surface of the support rod 46. To reduce mechanical wear, lubricating oil can be injected into the cylinder 41.

[0034] For details, please refer to the following: Figure 3 , Figure 4 , Figure 17 and Figure 18Inside the feeding box 5, a flat plate 51 is fixed. A servo motor 52 is fixedly installed on the bottom surface of the flat plate 51. The shaft of the servo motor 52 passes through the top of the flat plate 51 and is fixed with connecting seats 53 arranged in an equidistant circular array. Material rods 54 are fixed at the ends of the multiple connecting seats 53 that are far apart from each other.

[0035] Please refer to this carefully. Figures 20-23 The bottom surface of the connecting seat 53 is provided with an air guide groove 531, and the inside of the material rod 54 is provided with an air guide hole 541 that communicates with the air guide groove 531. The end of the material rod 54 away from the connecting seat 53 is fixed with a die head 542, and the outer surface of the die head 542 is provided with a plurality of air outlet holes 5421 that communicate with the air guide hole 541.

[0036] The die head 542 is adapted to the punch at the left end of the punch rod 45.

[0037] A vent 511 is provided on the plate 51, corresponding to the position of the air guide groove 531. A solenoid valve 55 is fixed on the bottom surface of the plate 51. The input end of the solenoid valve 55 is connected to the external high-pressure air tank, and the output end of the solenoid valve 55 is connected to the vent 511.

[0038] The feeding box 5 contains a raw material box 56 for holding the round shells 6 to be processed. A pneumatic push rod 57 is installed on the outer surface of the feeding box 5. The pneumatic push rod 57 is used to push the round shells 6 in the raw material box 56 toward the material rods 54, so that the round shells 6 are fitted onto the outside of one of the material rods 54. The servo motor 52, the solenoid valve 55 and the pneumatic push rod 57 are all electrically connected to the controller.

[0039] The outer surface of the feeding box 5 is provided with a storage box 58, and the plate 51 is provided with a stamping hole 59 corresponding to the position of the punch rod 45. During operation, the punch rod 45 passes through the stamping hole 59 to forge the round shell 6 sleeved on the material rod 54.

[0040] The working principle of the feeding box 5 is as follows: The pneumatic pusher 57 pushes the round shell 6 in the material box 56 towards the material rod 54, so that the round shell 6 is fitted onto one of the material rods 54. Then, the servo motor 52 drives the material rod 54 to rotate 90 degrees, so that the bottom of the round shell 6 to be processed corresponds to the position of the punch hole 59. After the round shell 6 is forged by the punch rod 45, the servo motor 52 drives the material rod 54 to rotate 90 degrees again, so that the forged round shell 6 faces the position of the storage box 58. Then, the controller controls the solenoid valve 55 to open, so that high-pressure gas enters the air guide hole 541 through the vent hole 511 and the air guide groove 531, and is then ejected through the air outlet 5421. The airflow blows the round shell 6 on the material rod 54 into the storage box 58. The loading and unloading operation of the round shell 6 is thus completed.

[0041] In addition, during the above process, when high-pressure gas enters the air guide groove 531 through the vent 511, some high-pressure gas will leak due to the gap between the bottom of the connecting seat 53 and the surface of the plate 51, resulting in a lower air pressure in the air guide hole 541. To solve this problem, during implementation, the gap between the bottom of the connecting seat 53 and the surface of the plate 51 can be minimized as much as possible, or an annular groove can be opened on the bottom surface of the connecting seat 53 and a sealing ring can be installed, and appropriate lubrication measures can be taken.

[0042] Please refer to this carefully. Figure 22 and Figure 23 As a further solution, the outer surface of the feed rod 54 is provided with multiple strip grooves 543, and arc-shaped spring pieces 544 are installed inside the strip grooves 543. When the round shell 6 is fitted onto the feed rod 54, the elasticity of the arc-shaped spring pieces 544 prevents the round shell 6 from sliding freely on the feed rod 54, and prevents the round shell 6 fitted onto the feed rod 54 from being thrown off when the servo motor 52 drives the feed rod 54 to rotate.

[0043] The working principle has been described above. Based on the implementation spirit of the above implementation scheme, the controller, control program and other related supporting technologies involved in this application can all be implemented through existing electrical and automation technologies, and will not be described in detail in this application.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A bottom forging device for a round shell stretching product, comprising a frame (1) and a loading box (5) disposed at the left end of the frame (1), a sliding box (2) slidably disposed in the middle of the frame (1), a hydraulic cylinder (3) for pushing the sliding box (2) to move left and right is installed between the frame (1) and the sliding box (2), and a forging cylinder mechanism (4) for forging the round shell in the loading box (5) is installed at one end of the sliding box (2) near the loading box (5), characterized in that: The forging cylinder mechanism (4) includes a cylinder (41), a cylinder cover (411) is threaded onto the left end of the cylinder (41), and a cylinder seat (412) is fixed to the right end of the cylinder (41), and the cylinder seat (412) is fixedly connected to the slide box (2). The cylinder (41) is slidably provided with a sliding column (42), and a limiting ring (43) is slidably sleeved on the outer surface of the sliding column (42). The limiting ring (43) is fixedly sleeved on the inner wall of the cylinder (41). A return spring (44) is provided between the sliding column (42) and the limiting ring (43). A punch rod (45) is fixed at the left end of the sliding column (42), and the punch rod (45) slides through the cylinder cover (411) to its left side. A support rod (46) is fixed at the right end of the sliding column (42). The cylinder (41) has a slidably arranged stamping block (47) inside. The stamping block (47) has an axially penetrating circular slot (471) in the middle and a square slot (472) arranged in a circumferential array about its axis in the middle. Each square slot (472) has a stop block (473) hinged inside. A leaf spring (474) is arranged between the left end of the stop block (473) and the stamping block (47). A limiting block (475) is arranged inside the square slot (472) to block the right end of the stop block (473). A compression spring (48) is provided between the stamping block (47) and the cylinder seat (412). A screw (49) is threadedly connected to the middle of the cylinder seat (412). A sliding hole is provided at the left end of the screw (49) to accommodate the sliding of the support rod (46). The left end of the screw (49) is slidably sleeved inside the circular slot (471). A stop ring (413) for limiting the stamping block (47) is fixedly sleeved on the inner wall of the cylinder (41).

2. The bottom sinking platform forging device for a round shell stretching product according to claim 1, characterized in that: The inner wall of the cylinder (41) is provided with a keyway (414), and a key bar is fixed at the edge of the sliding column (42), and the key bar is slidably disposed inside the keyway (414).

3. The bottom sinking forging device for a round shell stretching product according to claim 1, characterized in that: The feeding box (5) has a plate (51) fixed inside. A servo motor (52) is fixedly installed on the bottom surface of the plate (51). The shaft of the servo motor (52) passes through the top of the plate (51) and is fixed with connecting seats (53) arranged in an equidistant circular array. A material rod (54) is fixed at one end of each of the multiple connecting seats (53) that is far apart from each other.

4. The bottom sinking forging device for a round shell stretching product according to claim 3, characterized in that: The bottom surface of the connecting seat (53) is provided with an air guide groove (531), and the inside of the material rod (54) is provided with an air guide hole (541) that communicates with the air guide groove (531). The end of the material rod (54) away from the connecting seat (53) is fixed with a die head (542), and the outer surface of the die head (542) is provided with multiple air outlet holes (5421) that communicate with the air guide hole (541).

5. The bottom sinking forging device for a round shell stretching product according to claim 4, characterized in that: The plate (51) has a vent hole (511) corresponding to the position of the air guide groove (531). A solenoid valve (55) is fixed on the bottom surface of the plate (51). The input end of the solenoid valve (55) is connected to the external high-pressure air tank, and the output end of the solenoid valve (55) is connected to the vent hole (511).

6. The bottom sinking forging device for a round shell stretching product according to claim 4, characterized in that: The outer surface of the feed rod (54) is provided with multiple strip grooves (543), and an arc-shaped spring piece (544) is installed inside the strip groove (543).

7. The bottom sinking forging device for a round shell stretching product according to claim 4, characterized in that: The feeding box (5) is provided with a raw material box (56) for placing the round shell (6) to be processed. A pneumatic push rod (57) is installed on the outer surface of the feeding box (5). The pneumatic push rod (57) is used to push the round shell in the raw material box (56) toward the material rod (54).

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