A spinning forming device for machining mechanical parts

Abstract

The present invention relates to the technical field of machining of mechanical parts, and particularly to a spinning forming device for machining mechanical parts, which includes a clamping table, a rotary driving device, an external pressing member and an internal pressing member. Among them, the clamping table is used for clamping a metal pipe fitting; the rotary driving device is arranged on the clamping table to drive the metal pipe fitting to rotate around its own axis; the external pressing member is arranged outside the metal pipe fitting to apply a first pressure along the radial direction of the metal pipe fitting to the outer wall of the metal pipe fitting; the internal pressing member is arranged inside the metal pipe fitting to apply a second pressure to the inner wall of the metal pipe fitting, which has the same action point as the first pressure and the opposite direction, and the first pressure is greater than the second pressure. While the present invention performs spinning processing on the outer wall of the metal pipe fitting through the external pressing member, the internal pressing member provides a continuous and stable supporting force at the same position on the inner wall of the metal pipe fitting, effectively reducing the probability that the metal pipe fitting generates microcracks or undergoes unexpected deformation.

Description

Technical Field

[0001] The present invention relates to the technical field of machining of mechanical parts, and particularly to a spinning forming device for machining mechanical parts. Background Art

[0002] In the field of metal plastic forming, the numerical control machine tool spinning forming technology is applicable to the production of hollow rotary metal parts. It is widely used in many industries such as aerospace, automobile manufacturing, petrochemical industry, etc.

[0003] However, in the process of implementing spinning necking on thin-walled metal pipe fittings by using the current spinning equipment, there are some problems. Since the necking formed during the spinning process is in a gradual change form, it is difficult to provide a continuous and effective inner wall supporting force to the metal pipe fittings under the existing technical conditions. Therefore, when applying the spinning force, the metal pipe fittings lacking proper inner wall support are prone to generate microcracks or undergo unexpected deformation. These defects not only damage the appearance beauty of the product, but may also reduce its mechanical properties, ultimately affecting the product quality and reliability. In view of the above problems, the present invention proposes a spinning forming device for machining mechanical parts. Summary of the Invention

[0004] The purpose of the present invention is to provide a spinning forming device for machining mechanical parts to solve the problems raised in the above background art.

[0005] The present invention is achieved through the following technical solutions:

[0006] A spinning forming device for machining mechanical parts includes a clamping table, a rotary drive device, an external pressing member, and an internal pressing member. Among them, the clamping table is used for clamping the metal pipe fitting; the rotary drive device is arranged on the clamping table to drive the metal pipe fitting to rotate around its own axis; the external pressing member is arranged outside the metal pipe fitting to apply a first pressure along the radial direction of the metal pipe fitting to the outer wall of the metal pipe fitting; the internal pressing member is arranged inside the metal pipe fitting to apply a second pressure to the inner wall of the metal pipe fitting, which has the same acting point and opposite direction as the first pressure, and the first pressure is greater than the second pressure.

[0007] Optionally, the spin forming device for machining mechanical parts further includes an adjusting seat and a first linear driving device for driving the adjusting seat to move axially along the metal pipe fitting. The adjusting seat includes a pedestal, a connecting frame, a pulling rod member, a second linear driving device, and a first connecting rod. Among them, the connecting frame is fixedly connected to the pedestal. The internal pressing member is a rod-shaped member. One end of the internal pressing member is a pressing end, and the other end of the internal pressing member is a connecting end and is rotatably connected to the connecting frame. The pulling rod member is axially movably inserted into the connecting frame along the metal pipe fitting. The second linear driving device drives the pulling rod member to move axially along the metal pipe fitting. The first end of the first connecting rod is rotatably connected to the pulling rod member, and the second end of the first connecting rod is rotatably connected to the middle of the internal pressing member.

[0008] Optionally, the internal pressing member includes a rod body and a sphere. The rod body is connected to the connecting frame and the second end of the first connecting rod. The sphere serves as the pressing end and is rotatably connected to the rod body.

[0009] Optionally, the external pressing member is a roller structure. The adjusting seat further includes an L-shaped second connecting rod and a third connecting rod. The external pressing member is rotatably connected to the first end of the second connecting rod. The middle of the second connecting rod is rotatably connected to the connecting frame. The internal pressing member and the second connecting rod rotate around the same axis on the connecting frame. The first end of the third connecting rod is rotatably connected to the second end of the second connecting rod, and the second end of the third connecting rod is rotatably connected to the pulling rod member.

[0010] Optionally, a connecting shaft is provided on the sphere, and a connecting hole is provided at the end of the rod body. The connecting shaft is rotatably connected to the connecting hole through a bearing.

[0011] Optionally, a pair of the internal pressing members and a pair of the external pressing members are provided respectively to apply pressure to the opposite side walls of the metal pipe fitting.

[0012] Optionally, the clamping table includes a base, a support table, a clamping sleeve, a plurality of inner clamping blocks, a plurality of outer clamping blocks, a reaction gear, a driving rod, a fourth connecting rod, and a third linear driving device. Among them, the support table is fixedly arranged on the base; the clamping sleeve is rotatably connected to the support table; the plurality of inner clamping blocks are arranged in a circle in the clamping sleeve and are movable radially along the metal pipe fitting; the plurality of outer clamping blocks are located in the clamping sleeve and are arranged outside the plurality of inner clamping blocks. The plurality of outer clamping blocks correspond to the plurality of inner clamping blocks one by one, and each of the plurality of outer clamping blocks is movable radially along the metal pipe fitting; the reaction gear is arranged between the corresponding inner clamping block and the outer clamping block, and a first straight rack and a second straight rack meshing with the reaction gear are respectively arranged on the inner clamping block and the outer clamping block; the driving rod is arranged on the clamping sleeve and is movable axially along the metal pipe fitting; the first end of the fourth connecting rod is rotatably connected to the inner clamping block, and the second end of the fourth connecting rod is rotatably connected to the driving rod; the third linear driving device is used to drive the driving rod to move axially along the metal pipe fitting.

[0013] Optionally, the third linear driving device includes an electromagnet and a return spring. The return spring is arranged between the driving rod and the clamping sleeve. The electromagnet is fixedly installed on the clamping sleeve, and the driving rod is made of a magnetic material.

[0014] Optionally, the support table has a hollow structure. The rotary driving device includes a motor, a driving gear, and a gear rod. Among them, the motor is fixedly installed on the support table; the driving gear is located inside the support table and is fixedly connected to the output shaft of the motor; the gear rod penetrates and is rotatably connected to the support table. The first end of the gear rod has a first driven gear meshing with the driving gear, and the second end of the gear rod has a second driven gear. A tooth ring meshing with the second driven gear is arranged on the inner side of the clamping sleeve.

[0015] Optionally, a plurality of the gear rods are arranged around the driving gear.

[0016] Compared with the prior art, the present invention provides a spinning forming device for machining mechanical parts, which has the following beneficial effects:

[0017] 1. While the present invention performs spinning processing on the outer wall of the metal pipe fitting through an external pressing member, an internal pressing member is used to provide a continuous and stable supporting force to the same position on the inner wall of the metal pipe fitting. Compared with the prior art where only pressure is applied to the outer wall of the metal pipe fitting and there is no effective support for the inner wall, this can effectively reduce the probability of the metal pipe fitting generating microcracks or undergoing unexpected deformation, thereby improving the product quality and reliability;

[0018] 2. When the second linear driving device of the present invention drives the drawing rod member to move and drives the internal pressing member to rotate, the external pressing member can rotate in the same direction as the internal pressing member under the combined action of the second connecting rod and the third connecting rod, and the distance between the internal pressing member and the external pressing member can be basically kept unchanged during the process of rotary necking of the metal pipe fitting, so as to continue the supporting effect of the internal pressing member and the external pressing member on the inner and outer walls of the metal pipe fitting;

[0019] 3. By using the base, the support table, the clamping sleeve, a plurality of inner clamping blocks, a plurality of outer clamping blocks, the reaction gear, the driving rod, the fourth connecting rod and the third linear driving device in cooperation, the present invention can clamp the inner and outer sides of the metal pipe fitting bidirectionally, which can not only clamp the metal pipe fitting more firmly, but also reduce the probability of the metal pipe fitting being clamped and deformed. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0021] Figure 2 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0022] Figure 3 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0023] Figure 4 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0024] Figure 5 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0025] Figure 6 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0026] Figure 7 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0027] Figure 8 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0028] In the figure: 1, metal pipe fitting; 2, first linear driving device; 3, second linear driving device; 4, third linear driving device; 400, electromagnet; 401, return spring; 5, fourth linear driving device; 6, pedestal; 7, connecting frame; 700, connecting arm; 8, pull rod member; 9, first connecting rod; 10, second connecting rod; 11, third connecting rod; 12, fourth connecting rod; 13, rod body; 14, sphere; 15, connecting shaft; 16, external pressing member; 17, base; 18, supporting platform; 19, clamping sleeve; 20, inner clamping block; 21, outer clamping block; 22, reaction gear; 23, driving rod; 24, positioning shaft; 25, first straight rack; 26, second straight rack; 27, motor; 28, driving gear; 29, gear rod; 30, first driven gear; 31, second driven gear; 32, gear ring; 33, slider; 34, slide rail; 35, left support frame; 36, right support frame; 37, left sealing plate; 38, right sealing plate; 39, air guiding shaft; 40, thrust ball bearing; 41, gas boosting device; 42, gas transmission pipe; 43, rotary joint; 44, pressure relief valve; 45, pressure gauge; 46, pressure sensor; 47, one-way valve; 48, controller. Detailed implementation manner

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1: Please refer to Figures 1 to 7 , a spinning forming device for machining mechanical parts according to an embodiment of the present invention includes a clamping table, a rotary driving device, an external pressing member 16 and an internal pressing member. Among them, the clamping table is used to clamp the metal pipe fitting 1; the rotary driving device is arranged on the clamping table to drive the metal pipe fitting 1 to rotate around its own axis; the external pressing member 16 is arranged outside the metal pipe fitting 1 to apply a first pressure along the radial direction of the metal pipe fitting 1 to the outer wall of the metal pipe fitting 1; the internal pressing member is arranged inside the metal pipe fitting 1 to apply a second pressure to the inner wall of the metal pipe fitting 1 that is the same as the action point of the first pressure and in the opposite direction. The first pressure is greater than the second pressure, and the spinning necking of the metal pipe fitting 1 can be realized by using the pressure difference.

[0031] The spin forming device for machining mechanical parts with the above structure, while spin forming the outer wall of the metal pipe fitting 1 through the external pressing member 16, uses the internal pressing member to provide a continuous and stable supporting force to the same position on the inner wall of the metal pipe fitting 1. Compared with the prior art where only pressure is applied to the outer wall of the metal pipe fitting 1 and there is a lack of effective support for the inner wall, this can effectively reduce the probability of the metal pipe fitting 1 generating microcracks or undergoing unexpected deformation, thereby improving the product quality and reliability.

[0032] In this exemplary embodiment, the spin forming device for machining mechanical parts further includes an adjusting seat and a first linear driving device 2 for driving the adjusting seat to move axially along the metal pipe fitting 1. The first linear driving device 2 can specifically be a cylinder, a hydraulic cylinder, or an electric push rod. The adjusting seat includes a pedestal 6, a connecting frame 7, a pulling rod member 8, a second linear driving device 3, and a first connecting rod 9. Among them, the connecting frame 7 is fixedly connected to the pedestal 6. The internal pressing member is a rod-shaped member. One end of the internal pressing member is a pressing end, and the other end of the internal pressing member is a connecting end and is rotatably connected to the connecting frame 7 through a first rotating shaft; the pulling rod member 8 is axially movably inserted into the connecting frame 7 along the metal pipe fitting 1; the second linear driving device 3 drives the pulling rod member 8 to move axially along the metal pipe fitting 1. The second linear driving device 3 can specifically be a cylinder, a hydraulic cylinder, or an electric push rod; the first end of the first connecting rod 9 is rotatably connected to the pulling rod member 8 through a second rotating shaft, and the second end of the first connecting rod 9 is rotatably connected to the middle part of the internal pressing member through a third rotating shaft. With such a setting, the first linear driving device 2 can change the axial position of the internal pressing member inside the metal pipe fitting 1, thereby achieving the purpose of applying a second pressure to different positions on the inner wall of the metal pipe fitting 1. In addition, the second linear driving device 3 can drive the pulling rod member 8 to move, thereby driving the internal pressing member to rotate, and further changing the position of the internal pressing member in the radial direction of the metal pipe fitting 1, so that the internal pressing member can always apply a continuous and stable second pressure to the inner wall of the metal pipe fitting 1 during the process of the metal pipe fitting 1 being spin formed and reduced in diameter.

[0033] In this exemplary embodiment, the internal pressing member includes a rod body 13 and a sphere 14. The rod body 13 is connected to the connecting frame 7 and the second end of the first connecting rod 9. The sphere 14 serves as the pressing end and is rotatably connected to the rod body 13. Specifically, a connecting shaft 15 is provided on the sphere 14, and a connecting hole is provided at the end of the rod body 13. The connecting shaft 15 is rotatably connected to the connecting hole through a bearing. With such a setting, it is ensured that the sphere 14 can roll along the inner wall of the metal pipe fitting 1 during the spin forming process. Since the sphere 14 can rotate freely, it not only reduces the friction between it and the inner wall of the metal pipe fitting 1, reduces the risk of wear, but also extends the service life of the internal pressing member. In addition, it helps to protect the inner surface of the metal pipe fitting 1 from damage, thereby improving the product quality.

[0034] In the present exemplary embodiment, the external pressing member 16 is of a roller structure. The adjusting seat further includes an L-shaped second connecting rod 10 and a third connecting rod 11. The external pressing member 16 is rotatably connected to the first end of the second connecting rod 10. The middle part of the second connecting rod 10 is rotatably connected to the connecting frame 7 through a fourth rotating shaft. Specifically, the connecting frame 7 has a connecting arm 700, and the middle part of the second connecting rod 10 is rotatably connected to the connecting arm 700. The internal pressing member and the second connecting rod 10 rotate around the same axis on the connecting frame 7. The first end of the third connecting rod 11 is rotatably connected to the second end of the second connecting rod 10 through a fifth rotating shaft, and the second end of the third connecting rod 11 is rotatably connected to the draw rod member 8 through a sixth rotating shaft. With such a setting, when the second linear driving device 3 drives the draw rod member 8 to move and drives the internal pressing member to rotate, the external pressing member 16 can rotate in the same direction as the internal pressing member under the combined action of the second connecting rod 10 and the third connecting rod 11. In this way, the distance between the internal pressing member and the external pressing member 16 can be basically kept unchanged during the process of spinning and compressing the mouth of the metal pipe fitting 1, so as to continue the supporting effect of the internal pressing member and the external pressing member 16 on the inner and outer walls of the metal pipe fitting 1. Of course, during the actual process of necking the metal pipe fitting 1, the pipe wall near the necking position will gradually become thinner. In order to ensure the stability of the pressure of the internal pressing member and the external pressing member 16 on the inner and outer walls of the metal pipe fitting 1, it is necessary to change the distance between the two pressing members. At this time, the change in the distance between the two can be achieved by changing the angular velocity ratio when the internal pressing member and the external pressing member 16 rotate in the same direction. The methods for changing the angular velocity ratio when the internal pressing member and the external pressing member 16 rotate in the same direction include but are not limited to: setting the first connecting rod 9 and / or the second connecting rod 10 and / or the third connecting rod 11 as a telescopic rod-like structure, and the change in the angular velocity ratio when the internal pressing member and the external pressing member 16 rotate in the same direction can be realized by changing the length of one or more of the connecting rods.

[0035] In order to avoid the situation that the metal pipe fitting 1 is damaged due to unilateral force, in the present exemplary embodiment, a pair of internal pressing members and a pair of external pressing members 16 are provided respectively to apply pressure to the opposite side walls of the metal pipe fitting 1. The two-way clamping of the metal pipe fitting 1 can be realized by the two pairs of pressing members, so as to reduce the phenomenon of excessive deformation of the metal pipe fitting 1 during the spinning process.

[0036] In the present exemplary embodiment, the clamping table includes a base 17, a support table 18, a clamping sleeve 19, a plurality of inner clamping blocks 20, a plurality of outer clamping blocks 21, a reaction gear 22, a drive rod 23, a fourth connecting rod 12, and a third linear drive device 4. Among them, the support table 18 is fixedly arranged on the base 17; the clamping sleeve 19 is rotatably connected to the support table 18 through a bearing; the plurality of inner clamping blocks 20 are arranged in a circle inside the clamping sleeve 19 and are movable along the radial direction of the metal pipe fitting 1; the plurality of outer clamping blocks 21 are located inside the clamping sleeve 19 and are arranged around the outside of the plurality of inner clamping blocks 20. The plurality of outer clamping blocks 21 and the plurality of inner clamping blocks 20 are in one-to-one correspondence in position. That is to say, an annular gap is formed between the plurality of inner clamping blocks 20 and the plurality of outer clamping blocks 21. The plurality of outer clamping blocks 21 are each movable along the radial direction of the metal pipe fitting 1. A positioning shaft 24 is fixedly arranged on the outside of each outer clamping block 21, and the positioning shaft 24 is movably inserted and matched with the clamping sleeve 19; the reaction gear 22 is arranged between the corresponding inner clamping block 20 and outer clamping block 21. The reaction gear 22 is rotatably connected to the clamping sleeve 19. A first straight rack 25 and a second straight rack 26 meshing with the reaction gear 22 are respectively arranged on the corresponding inner clamping block 20 and outer clamping block 21; the drive rod 23 is arranged on the clamping sleeve 19 and is movable along the axial direction of the metal pipe fitting 1; the first end of the fourth connecting rod 12 is rotatably connected to the inner clamping block 20 through a seventh rotating shaft, and the second end of the fourth connecting rod 12 is rotatably connected to the drive rod 23 through an eighth rotating shaft; the third linear drive device 4 is used to drive the drive rod 23 to move along the axial direction of the metal pipe fitting 1. With such a setting, when it is necessary to clamp the metal pipe fitting 1, the drive rod 23 is driven to move by the third linear drive device 4. The drive rod 23 drives the plurality of inner clamping blocks 20 to approach each other through the fourth connecting rod 12. During the process that the plurality of inner clamping blocks 20 approach each other, the plurality of outer clamping blocks 21 move away from each other under the transmission cooperation of the reaction gear 22 and the straight racks, and the gap between the inner clamping blocks 20 and the outer clamping blocks 21 increases. In this way, the end of the metal pipe fitting 1 to be processed can be easily inserted into the gap. After the metal pipe fitting 1 is inserted into the gap, the drive rod 23 is driven to move in the reverse direction by the third linear drive device 4. The drive rod 23 drives the plurality of inner clamping blocks 20 to move away from each other through the fourth connecting rod 12. During the process that the plurality of inner clamping blocks 20 approach each other, the plurality of outer clamping blocks 21 move closer to each other under the transmission cooperation of the reaction gear 22 and the straight racks, and the gap between the inner clamping blocks 20 and the outer clamping blocks 21 gradually shrinks until the metal pipe fitting 1 is clamped. Since the acting points of the clamping forces applied by the inner clamping blocks 20 and the outer clamping blocks 21 on the metal pipe fitting 1 are the same and the directions are opposite, not only can the metal pipe fitting 1 be clamped more firmly, but also the probability of the metal pipe fitting 1 being clamped and deformed can be reduced.

[0037] In this exemplary embodiment, the third linear driving device 4 includes an electromagnet 400 and a return spring 401. The return spring 401 is disposed between the driving rod 23 and the clamping sleeve 19. The electromagnet 400 is fixedly mounted on the clamping sleeve 19, and the driving rod 23 is made of a magnetic material. With such an arrangement, when the electromagnet 400 is powered off, the gap between the plurality of inner clamping blocks 20 and the plurality of outer clamping blocks 21 can be maintained in a relatively wide state under the elastic force of the return spring 401, facilitating the insertion of the metal pipe fitting 1. When it is necessary to clamp the metal pipe fitting 1 placed in the gap, the electromagnet 400 can be powered on. The electromagnet 400 attracts the driving rod 23, causing it to move leftward, thereby narrowing the gap between the plurality of inner clamping blocks 20 and the plurality of outer clamping blocks 21, so that the metal pipe fitting 1 can be quickly clamped. Of course, in other embodiments, the third linear driving device 4 may also be replaced by a cylinder, a hydraulic cylinder, or an electric push rod.

[0038] To realize the rotation of the metal pipe fitting 1, in this exemplary embodiment, the support platform 18 has a hollow structure. The rotation driving device includes a motor 27, a driving gear 28, and a gear rod 29. Among them, the motor 27 is fixedly mounted on the support platform 18; the driving gear 28 is located inside the support platform 18 and is fixedly connected to the output shaft of the motor 27; the gear rod 29 penetrates and is rotatably connected to the support platform 18. The first end of the gear rod 29 has a first driven gear 30 meshing with the driving gear 28, and the second end of the gear rod 29 has a second driven gear 31. A toothed ring 32 meshing with the second driven gear 31 is provided on the inner side of the clamping sleeve 19. Specifically, a plurality of gear rods 29 are provided, and the plurality of gear rods 29 are arranged around the driving gear 28. With such an arrangement, when it is necessary to perform spinning processing on the metal pipe fitting 1, the motor 27 is started. The motor 27 drives the driving gear 28 to rotate, and the driving gear 28 drives the plurality of gear rods 29 to rotate synchronously. The plurality of gear rods 29 drive the clamping sleeve 19 and the metal pipe fitting 1 clamped and fixed on the clamping sleeve 19 to rotate.

[0039] In this exemplary embodiment, the bottom of the pedestal 6 is slidably connected to the base 17 through the sliding fit of a slider 33 and a slide rail 34.

[0040] Embodiment 2: As Figure 8As shown, the clamping table includes a base 17, a left support frame 35, a right support frame 36, a left sealing plate 37, a right sealing plate 38, and a fourth linear driving device 5. The base 17 in Embodiment 2 has the same structure as the base 17 in Embodiment 1. The right support frame 36 is fixedly arranged on the right side of the top of the base 17, and the left support frame 35 is movably arranged on the left side of the top of the base 17. A fourth driving device for driving the left support frame 35 to move left and right is installed on the base 17. The fourth linear driving device 5 can specifically be a cylinder, a hydraulic cylinder, or an electric push rod. The opposite sides of the left support frame 35 and the right support frame 36 are respectively rotatably connected with a left sealing plate 37 and a right sealing plate 38. The right sealing plate 38 is rotatably connected with the right support frame 36 through a gas guide shaft 39, and a thrust ball bearing 40 is arranged between the right sealing plate 38 and the right support frame 36; the rotation driving device includes a motor 27. The motor 27 is installed on the left support frame 35, and the output shaft of the motor 27 is fixedly connected with the left sealing plate 37. The motor 27 in Embodiment 2 has the same structure as the motor 27 in Embodiment 1; the external pressing member 16 can move axially and radially along the metal pipe fitting 1 under the drive of the cylinder; the left sealing plate 37 and the right sealing plate 38 seal both ends of the metal pipe fitting 1, and the internal pressing member is a medium (such as air with a predetermined pressure) formed by the medium conveyed into the metal pipe fitting 1 through the gas guide shaft 39; it should be noted that: the pressure of the medium can be set according to the wall thickness of the metal pipe fitting 1 to be processed. The pressure exerted by the medium on the inner wall of the metal pipe fitting 1 is the second pressure, and the second pressure is less than the first pressure. In addition, since the wall thickness of the metal pipe fitting 1 will gradually become thinner when it is spin-compressed and flanged, the pressure of the medium should be appropriately reduced at this time; while the outer wall of the metal pipe fitting 1 is being spin-processed by the external pressing member 16, a continuous and stable supporting force is provided to the inner wall of the metal pipe fitting 1 by the medium with a predetermined pressure, which can also effectively reduce the probability of the metal pipe fitting 1 generating micro-cracks or undergoing unexpected deformation, thereby improving the product quality and reliability. Further, a gas boosting device 41 is installed on the base 17. The gas boosting device 41 can be a compressor or a blower. The exhaust end of the gas boosting device 41 is connected to the gas guide shaft 39 through a gas transmission pipe 42. The gas transmission pipe 42 is connected to the gas guide shaft 39 through a rotary joint 43. A pressure relief valve 44 for discharging the excess pressure inside the metal pipe fitting 1 is arranged on the gas guide shaft 39. The gas transmission pipe 42 is successively provided with a pressure gauge 45, a pressure sensor 46, and a one-way valve 47 from left to right. The pressure gauge 45 is convenient for the operating personnel to judge the pressure inside the metal pipe fitting 1. When the pressure drops significantly, it indicates that there may be a gas leakage phenomenon in the metal pipe fitting 1. The pressure sensor 46 is connected to the gas boosting device 41 through a controller 48.The air pressure sensor 46 monitors the air pressure inside the metal pipe 1 in real time. When the air pressure inside the metal pipe 1 is too low, the controller 48 controls the gas booster 41 to start and input air into the metal pipe 1, thereby increasing the air pressure inside the metal pipe 1 to ensure that sufficient supporting force can be formed on the inner wall of the metal pipe 1.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spinning forming device for machining mechanical parts, characterized in that: include: A clamping table for clamping a metal pipe (1); A rotation driving device, arranged on the clamping table and used for driving the metal pipe (1) to rotate around its own axis; An external abutment member (16) arranged outside the metal pipe (1) and used for applying a first pressure in the radial direction of the metal pipe (1) to the outer wall of the metal pipe (1); and an internal tightening member, arranged inside the metal pipe (1) and used to apply a second pressure to the inner wall of the metal pipe (1) at the same point of application as the first pressure and in the opposite direction, wherein the first pressure is greater than the second pressure; The spin forming device for machining mechanical parts further comprises an adjustment seat and a first linear drive device (2) for driving the adjustment seat to move along the axial direction of the metal pipe (1), wherein the adjustment seat comprises: Pedestal(6); A connecting frame (7) is fixedly connected to the pedestal (6); the internal abutting member is a rod-shaped member, one end of the internal abutting member is a abutting end, and the other end is a connecting end and is rotatably connected to the connecting frame (7); A pull rod (8) is movably inserted into the connecting frame (7) along the axial direction of the metal pipe (1); A second linear drive device (3) drives the pulling rod (8) to move along the axial direction of the metal pipe (1); and a first connecting rod (9), a first end of which is rotatably connected to the pulling rod (8), and a second end of which is rotatably connected to the middle portion of the internal abutting member; The internal abutment member comprises a rod body (13) and a sphere (14); the rod body (13) is connected to the connecting frame (7) and the second end of the first connecting rod (9); the sphere (14) serves as the abutment end and is rotatably connected to the rod body (13); The external abutment member (16) is a roller structure, and the adjustment seat further comprises: An L-shaped second connecting rod (10), the external abutting member (16) being rotatably connected to a first end of the second connecting rod (10), a middle portion of the second connecting rod (10) being rotatably connected to the connecting frame (7), and the internal abutting member and the second connecting rod (10) rotating around the same axis on the connecting frame (7); and a third connecting rod (11), a first end of which is rotatably connected to the second end of the second connecting rod (10), and a second end of which is rotatably connected to the pulling rod (8); The spherical body (14) is provided with a connecting shaft (15), and the end of the rod body (13) is provided with a connecting hole, and the connecting shaft (15) is rotatably connected to the connecting hole via a bearing; The internal fastening member and the external fastening member (16) are each provided in a pair and respectively apply pressure to the opposite side walls of the metal pipe (1).

2. The spin forming device for machining mechanical parts according to claim 1, characterized in that: The clamping table comprises: Base (17); A support platform (18) is fixedly disposed on the base (17); A clamping sleeve (19) rotatably connected to the support platform (18); A plurality of inner clamping blocks (20) are arranged in a circumferential manner inside the clamping sleeve (19) and are movable along the radial direction of the metal pipe (1); A plurality of outer clamping blocks (21) are located in the clamping sleeve (19) and are arranged around the outer sides of the plurality of inner clamping blocks (20), the plurality of outer clamping blocks (21) correspond to the plurality of inner clamping blocks (20) in position, and the plurality of outer clamping blocks (21) are each movable along the radial direction of the metal pipe (1); A reaction gear (22) is arranged between the corresponding inner clamp block (20) and the outer clamp block (21), and the inner clamp block (20) and the outer clamp block (21) are respectively provided with a first spur rack (25) and a second spur rack (26) meshing with the reaction gear (22); A driving rod (23) is disposed on the clamping sleeve (19) and is movable along the axial direction of the metal pipe (1); a fourth connecting rod (12), a first end of which is rotatably connected to the inner clamping block (20), and a second end of which is rotatably connected to the driving rod (23); And a third linear drive device (4) for driving the drive rod (23) to move along the axial direction of the metal pipe (1).

3. The spin forming device for machining mechanical parts according to claim 2, characterized in that: The third linear drive device (4) comprises an electromagnet (400) and a return spring (401), wherein the return spring (401) is arranged between the drive rod (23) and the clamping sleeve (19), the electromagnet (400) is fixedly mounted on the clamping sleeve (19), and the drive rod (23) is made of magnetic material.

4. The spin forming device for machining mechanical parts according to claim 3, characterized in that: The support platform (18) is a hollow structure, and the rotation drive device comprises: A motor (27) is fixedly mounted on the support platform (18); A driving gear (28) is located inside the support platform (18) and is fixedly connected to the output shaft of the motor (27); and a gear rod (29) passing through and rotatably connected to the support platform (18); the first end of the gear rod (29) has a first driven gear (30) meshing with the driving gear (28); the second end of the gear rod (29) has a second driven gear (31); and the inner side of the clamping sleeve (19) is provided with a gear ring (32) meshing with the second driven gear (31).

5. The spin forming device for machining mechanical parts according to claim 4, characterized in that: A plurality of gear rods (29) are provided, and the plurality of gear rods (29) are arranged around the driving gear (28).

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