Spinning forming device for machining mechanical parts

Abstract

The invention relates to the technical field of mechanical part machining, in particular to a spinning forming device for mechanical part machining, which comprises a clamping table, a rotary driving device, an external abutting part and an internal abutting part, and is characterized in that the clamping table is used for clamping a metal pipe fitting; the rotation driving device is arranged on the clamping table and used for driving the metal pipe fitting to rotate around the axis of the metal pipe fitting. The external abutting part is arranged outside the metal pipe fitting and used for applying first pressure in the radial direction of the metal pipe fitting to the outer wall of the metal pipe fitting; the internal abutting piece is arranged in the metal pipe and used for applying second pressure which is the same as the first pressure acting point and opposite to the first pressure acting point in direction to the inner wall of the metal pipe, and the first pressure is larger than the second pressure. According to the spinning device, the outer wall of the metal pipe fitting is subjected to spinning machining through the outer abutting part, meanwhile, the inner abutting part is used for providing continuous and stable supporting force for the same position of the inner wall of the metal pipe fitting, and the probability that the metal pipe fitting generates microcracks or unexpected deformation is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical parts processing, in particular to a spinning forming device for mechanical parts processing. Background Art

[0002] In the field of metal plastic forming, CNC machine tool spinning technology is suitable for producing hollow rotating metal parts. It is widely used in a variety of industries such as aerospace, automobile manufacturing, and petrochemicals.

[0003] However, there are some problems in the process of using current spinning equipment to implement spinning necking on thin-walled metal pipes. Since the necking formed during the spinning process is in a gradual form, it is difficult to provide a continuous and effective inner wall support force to the metal pipe under existing technical conditions. Therefore, when the spinning force is applied, the metal pipe without proper support on the inner wall is prone to microcracks or unexpected deformation. These defects not only damage the appearance of the product, but may also reduce its mechanical properties, ultimately affecting product quality and reliability. In response to the above problems, the present invention proposes a spinning forming device for machining mechanical parts. Summary of the Invention

[0004] The object of the present invention is to provide a spin forming device for machining mechanical parts, so as to solve the problems raised in the above-mentioned background technology.

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

[0006] A spin forming device for machining mechanical parts comprises a clamping table, a rotary drive device, an external clamping member and an internal clamping member, wherein the clamping table is used to clamp a metal pipe; the rotary drive device is arranged on the clamping table to drive the metal pipe to rotate around its own axis; the external clamping member is arranged on the outside of the metal pipe to apply a first pressure in the radial direction of the metal pipe to the outer wall of the metal pipe; the internal clamping member is arranged on the inside of the metal pipe to apply a second pressure to the inner wall of the metal pipe at the same point of application and in the opposite direction as the first pressure, and the first pressure is greater than the second pressure.

[0007] Optionally, the spin forming device for processing mechanical parts also includes an adjusting seat and a first linear drive device for driving the adjusting seat to move axially along the metal pipe fitting, the adjusting seat includes a base, a connecting frame, a pulling rod, a second linear drive device and a first connecting rod, wherein the connecting frame is fixedly connected to the base, the internal clamping member is a rod-shaped member, one end of the internal clamping member is the clamping end, and the other end of the internal clamping member is the connecting end and is rotatably connected to the connecting frame; the pulling rod is movably inserted into the connecting frame along the axial direction of the metal pipe fitting; the second linear drive device drives the pulling rod to move axially along the metal pipe fitting; the first end of the first connecting rod is rotatably connected to the pulling rod, and the second end of the first connecting rod is rotatably connected to the middle part of the internal clamping member.

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

[0009] Optionally, the external clamping member is a roller structure, and the adjustment seat also includes an L-shaped second connecting rod and a third connecting rod. The external clamping member is rotatably connected to the first end of the second connecting rod, the middle part of the second connecting rod is rotatably connected to the connecting frame, and the internal clamping 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.

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

[0011] Optionally, the internal abutting members and the external abutting members are provided in pairs and apply pressure to opposite side walls of the metal pipe respectively.

[0012] Optionally, the clamping platform includes a base, a support platform, 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 drive device, wherein the support platform is fixedly arranged on the base; the clamping sleeve is rotatably connected to the support platform; a plurality of inner clamping blocks are circumferentially arranged in the clamping sleeve and are movable along the radial direction of the metal pipe; a plurality of outer clamping blocks are located in the clamping sleeve and are arranged around the outside of the plurality of inner clamping blocks, and the plurality of outer clamping blocks correspond to the plurality of inner clamping blocks in one-to-one position. The several outer clamping blocks are each movable along the radial direction of the metal pipe; a reaction gear is arranged between the corresponding inner clamping block and the outer clamping block, and the inner clamping block and the outer clamping block are respectively provided with a first spur rack and a second spur rack that mesh with the reaction gear; a driving rod is arranged on the clamping sleeve and is movable along the axial direction of the metal pipe; 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; a third linear drive device is used to drive the driving rod to move along the axial direction of the metal pipe.

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

[0014] Optionally, the support platform is a hollow structure, and the rotation drive device includes a motor, a driving gear and a gear rod, wherein the motor is fixedly mounted on the support platform; the driving gear is located inside the support platform and fixedly connected to the output shaft of the motor; the gear rod passes through and is rotatably connected to the support platform, the first end of the gear rod has a first driven gear meshing with the driving gear, the second end of the gear rod has a second driven gear, and the inner side of the clamping sleeve is provided with a gear ring meshing with the second driven gear.

[0015] Optionally, a plurality of gear rods are provided, and the plurality of 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. The present invention simultaneously spins the outer wall of the metal pipe using an external abutment while providing a continuous and stable support force to the same location on the inner wall of the metal pipe using an internal abutment. Compared to the prior art, which only applies pressure to the outer wall of the metal pipe without providing effective support to the inner wall, this method can effectively reduce the probability of microcracks or unexpected deformation in the metal pipe, thereby improving product quality and reliability.

[0018] 2. When the second linear drive device of the present invention drives the pulling rod to move and drives the internal holding member to rotate, the external holding member can rotate in the same direction as the internal holding member under the joint action of the second connecting rod and the third connecting rod. The distance between the internal holding member and the external holding member can remain substantially unchanged during the process of screwing the metal pipe to close the opening, thereby maintaining the supporting effect of the internal and external holding members on the inner and outer walls of the metal pipe.

[0019] 3. The present invention can perform bidirectional clamping on the inside and outside of the metal pipe by setting a base, a support platform, a clamping sleeve, a plurality of inner clamping blocks, a plurality of outer clamping blocks, a reaction gear, a drive rod, a fourth connecting rod and a third linear drive device. It can not only clamp the metal pipe more firmly, but also reduce the probability of the metal pipe being deformed by clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of Example 1 of the present invention;

[0021] Figure 2 This is a structural diagram of Example 1 of the present invention;

[0022] Figure 3 This is a structural diagram of Example 1 of the present invention;

[0023] Figure 4 This is a structural diagram of Example 1 of the present invention;

[0024] Figure 5 This is a structural diagram of Example 1 of the present invention;

[0025] Figure 6 This is a structural diagram of Example 1 of the present invention;

[0026] Figure 7 This is a structural diagram of Example 1 of the present invention;

[0027] Figure 8 This is a structural diagram of Example 2 of the present invention.

[0028] In the figure: 1. Metal pipe; 2. First linear drive device; 3. Second linear drive device; 4. Third linear drive device; 400. Electromagnet; 401. Return spring; 5. Fourth linear drive device; 6. Base; 7. Connecting frame; 700. Connecting arm; 8. Pulling rod; 9. First connecting rod; 10. Second connecting rod; 11. Third connecting rod; 12. Fourth connecting rod; 13. Rod body; 14. Ball; 15. Connecting shaft; 16. External fastening member; 17. Base; 18. Support platform; 19. Clamping sleeve; 20. Inner clamping block; 21. Outer clamping block; 22. Reaction gear Wheel; 23. Drive rod; 24. Positioning shaft; 25. First spur rack; 26. Second spur rack; 27. Motor; 28. Driving gear; 29. ​​Gear rod; 30. First driven gear; 31. Second driven gear; 32. Ring gear; 33. Slider; 34. Slide rail; 35. Left support frame; 36. Right support frame; 37. Left sealing plate; 38. Right sealing plate; 39. Gas guide shaft; 40. Thrust ball bearing; 41. Gas boosting device; 42. Gas pipe; 43. Rotary joint; 44. Pressure relief valve; 45. Pressure gauge; 46. Pressure sensor; 47. One-way valve; 48. Controller. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figures 1 to 7 According to an embodiment of the present invention, a spin forming device for machining mechanical parts is provided, which includes a clamping table, a rotary driving device, an external clamping member 16 and an internal clamping member, wherein the clamping table is used to clamp the metal pipe 1; the rotary driving device is arranged on the clamping table to drive the metal pipe 1 to rotate around its own axis; the external clamping member 16 is arranged on the outside of the metal pipe 1 to apply a first radial pressure to the outer wall of the metal pipe 1; the internal clamping member is arranged on the inside of the metal pipe 1 to apply a second pressure to the inner wall of the metal pipe 1 at the same point of application and in the opposite direction as the first pressure, the first pressure is greater than the second pressure, and the pressure difference can be used to achieve the spin compression of the metal pipe 1.

[0031] The spinning forming device for machining mechanical parts using the above-mentioned structure, while spinning the outer wall of the metal pipe 1 through the external fastening member 16, uses the internal fastening member to provide a continuous and stable supporting force to the same position of the inner wall of the metal pipe 1. Compared with the prior art that only applies pressure to the outer wall of the metal pipe 1 but lacks effective support for the inner wall, this can effectively reduce the probability of microcracks or unexpected deformation of the metal pipe 1, thereby improving product quality and reliability.

[0032] In this exemplary embodiment, the spin forming device for processing mechanical parts also includes an adjusting seat and a first linear drive device 2 for driving the adjusting seat to move axially along the metal pipe 1. The first linear drive device 2 can specifically be a cylinder, a hydraulic cylinder or an electric push rod. The adjusting seat includes a base 6, a connecting frame 7, a pulling rod 8, a second linear drive device 3 and a first connecting rod 9, wherein the connecting frame 7 is fixedly connected to the base 6, the internal clamping member is a rod-shaped member, one end of the internal clamping member is the clamping end, and the other end of the internal clamping member is the connecting end and is rotatably connected to the connecting frame 7 through a first rotating shaft; the pulling rod 8 is movably inserted into the connecting frame 7 along the axial direction of the metal pipe 1; the second linear drive device 3 drives the pulling rod 8 to move axially along the metal pipe 1. The second linear drive 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 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 clamping member through a third rotating shaft. With this arrangement, the first linear drive device 2 can change the axial position of the internal abutment within the metal tube 1, thereby achieving the purpose of applying the second pressure to different positions on the inner wall of the metal tube 1. In addition, the second linear drive device 3 can drive the pull-out rod 8 to move, thereby driving the internal abutment to rotate, thereby changing the radial position of the internal abutment within the metal tube 1. This allows the internal abutment to consistently apply a continuous and stable second pressure to the inner wall of the internal abutment during the spinning and diameter-changing process of the metal tube 1.

[0033] In this exemplary embodiment, the internal clamping 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 a clamping 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. This arrangement ensures that the sphere 14 can roll along the inner wall of the metal pipe 1 during the spinning process. Since the sphere 14 can rotate freely, it not only reduces the friction between it and the inner wall of the metal pipe 1, reduces the risk of wear, but also extends the service life of the internal clamping member. In addition, it also helps to protect the inner surface of the metal pipe 1 from damage, thereby improving the quality of the product.

[0034] In this exemplary embodiment, the external clamping member 16 is a roller structure, and the adjustment seat also includes an L-shaped second connecting rod 10 and a third connecting rod 11. The external clamping member 16 is rotatably connected to the first end of the second connecting rod 10, and 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 clamping 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 the fifth rotating shaft, and the second end of the third connecting rod 11 is rotatably connected to the pulling rod 8 through the sixth rotating shaft. With such an arrangement, when the second linear drive device 3 drives the pulling rod 8 to move and drives the internal holding member to rotate, the external holding member 16 can generate a rotation in the same direction as the internal holding member under the joint action of the second connecting rod 10 and the third connecting rod 11. In this way, the distance between the internal holding member and the external holding member 16 can remain basically unchanged during the process of the metal pipe 1 being screwed into the neck, so as to continue the supporting effect of the internal holding member and the external holding member 16 on the inner and outer walls of the metal pipe 1. Of course, during the actual necking process of the metal pipe 1, the wall of the pipe near the necking position will gradually become thinner. In order to ensure the stability of the pressure exerted by the internal holding member and the external holding member 16 on the inner and outer walls of the metal pipe 1, the distance between the two holding members needs to be changed. At this time, the change in the distance between the internal and external clamping members 16 can be achieved by changing the angular velocity ratio when the internal and external clamping members 16 rotate in the same direction. The way to change the angular velocity ratio when the internal and external clamping members 16 rotate in the same direction includes but is not limited to: setting the first connecting rod 9 and / or the second connecting rod 10 and / or the third connecting rod 11 into a retractable rod-like structure, and changing the angular velocity ratio when the internal and external clamping members 16 rotate in the same direction can be achieved by changing the length of one or more connecting rods.

[0035] To prevent damage to the metal tube 1 due to unilateral force, in this exemplary embodiment, a pair of internal and external abutments 16 are provided, each applying pressure to opposite sidewalls of the metal tube 1. The two pairs of abutments allow for bidirectional clamping of the metal tube 1, thereby reducing excessive deformation of the metal tube 1 during the spinning process.

[0036] In this exemplary embodiment, the clamping platform includes a base 17, a support platform 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, wherein the support platform 18 is fixedly arranged on the base 17; the clamping sleeve 19 is rotatably connected to the support platform 18 through a bearing; the plurality of inner clamping blocks 20 are circumferentially arranged in the clamping sleeve 19 and are movable along the radial direction of the metal pipe 1; the plurality of outer clamping blocks 21 are located in the clamping sleeve 19 and are arranged around the outside of the plurality of inner clamping blocks 20, and the plurality of outer clamping blocks 21 correspond to the plurality of inner clamping blocks 20 in one-to-one position, that is, an annular gap is formed between the plurality of inner clamping blocks 20 and the plurality of outer clamping blocks 21, and the plurality of outer clamping blocks 21 are each It is movable along the radial direction of the metal pipe fitting 1, and a positioning shaft 24 is fixedly provided on the outside of each outer clamping block 21, and the positioning shaft 24 is movably plugged into the clamping sleeve 19; the reaction gear 22 is arranged between the corresponding inner clamping block 20 and the outer clamping block 21, and the reaction gear 22 is rotatably connected to the clamping sleeve 19. The corresponding inner clamping block 20 and the outer clamping block 21 are respectively provided with a first straight rack 25 and a second straight rack 26 that meshes with the reaction gear 22; the driving rod 23 is provided 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 the seventh rotating shaft, and the second end of the fourth connecting rod 12 is rotatably connected to the driving rod 23 through the eighth rotating shaft; the third linear drive device 4 is used to drive the driving rod 23 to move along the axial direction of the metal pipe fitting 1. With such a configuration, when it is necessary to clamp the metal pipe 1, the driving rod 23 is driven to move by the third linear drive device 4, and the driving rod 23 drives the plurality of inner clamping blocks 20 to approach each other through the fourth connecting rod 12. During the process of the plurality of inner clamping blocks 20 approaching each other, the plurality of outer clamping blocks 21 are moved away from each other under the transmission cooperation of the reaction gear 22 and the spur rack, and the gap between the inner clamping blocks 20 and the outer clamping blocks 21 is increased. In this way, the end of the metal pipe 1 to be processed can be easily inserted into the gap. After the metal pipe 1 is inserted into the gap, the driving rod 23 is driven by the third linear drive device 4. The rod 23 moves in the opposite direction, and the driving rod 23 drives the several inner clamping blocks 20 to move away from each other through the fourth connecting rod 12. In the process of the several inner clamping blocks 20 approaching each other, the several outer clamping blocks 21 approach each other under the transmission cooperation of the reaction gear 22 and the spur rack. The gap between the inner clamping blocks 20 and the outer clamping blocks 21 gradually narrows until the metal pipe 1 is clamped. Since the clamping forces applied to the metal pipe 1 by the inner clamping blocks 20 and the outer clamping blocks 21 act at the same point and in opposite directions, not only can the metal pipe 1 be clamped more firmly, but also the probability of the metal pipe 1 being deformed by clamping can be reduced.

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

[0038] To achieve rotation of the metal tube 1, in this exemplary embodiment, the support platform 18 is hollow. The rotation drive device includes a motor 27, a driving gear 28, and a gear rod 29. The motor 27 is fixedly mounted on the support platform 18; the driving gear 28 is located within the support platform 18 and fixedly connected to the output shaft of the motor 27; the gear rod 29 extends through the support platform 18 and is rotatably connected to the support platform 18. The first end of the gear rod 29 has a first driven gear 30 that meshes with the driving gear 28, and the second end of the gear rod 29 has a second driven gear 31. The inner side of the clamping sleeve 19 is provided with a ring gear 32 that meshes with the second driven gear 31. Specifically, multiple gear rods 29 are provided, and the multiple gear rods 29 are arranged around the driving gear 28. With this arrangement, when the metal tube 1 is to be spun, the motor 27 is started, which drives the driving gear 28 to rotate. The driving gear 28 drives the multiple gear rods 29 to rotate synchronously. The multiple gear rods 29 drive the clamping sleeve 19 and the metal tube 1 clamped and fixed thereto 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 the slider 33 and the slide rail 34 .

[0040] Example 2: Figure 8As shown, the clamping platform 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 drive device 5. The base 17 in Example 2 adopts the same structure as the base 17 in Example 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 drive device for driving the left support frame 35 to move left and right is installed on the base 17. The fourth linear drive device 5 can specifically be a cylinder or a hydraulic cylinder or an electric push rod. The left support frame 35 and the right support frame 36 have the left sealing plate 37 and the right sealing plate 38 rotatingly connected on the opposite sides respectively. The right sealing plate 38 is rotatably connected to the right support frame 36 through an air guide shaft 39. There is a fourth drive device between the right sealing plate 38 and the right support frame 36. There is a thrust ball bearing 40; the rotation drive device includes a motor 27, which is installed on the left support frame 35, and the output shaft of the motor 27 is fixedly connected to the left sealing plate 37. The motor 27 in Example 2 has the same structure as the motor 27 in Example 1; the external clamping member 16 is movable along the axial and radial directions of the metal pipe 1 under the drive of the cylinder; the left sealing plate 37 and the right sealing plate 38 close the two ends of the metal pipe 1, and the internal clamping member is a medium with a predetermined pressure (for example, air with a predetermined pressure) formed by the medium transported to the inside of the metal pipe 1 through the air 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 1 being processed, and the pressure exerted by the medium on the inner wall of the metal pipe 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 1 will gradually become thinner when the opening is spun, the pressure of the medium should be appropriately reduced at this time; while the outer wall of the metal pipe 1 is spun by the external fastening member 16, a medium with a predetermined pressure is used to provide a continuous and stable supporting force to the inner wall of the metal pipe 1, which can also effectively reduce the probability of microcracks or unexpected deformation of the metal pipe 1, thereby improving product quality and reliability. Furthermore, 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 an air pipe 42. The air pipe 42 is connected to the gas guide shaft 39 through a rotary joint 43. The gas guide shaft 39 is provided with a pressure relief valve 44 for releasing excess pressure inside the metal pipe 1. The air pipe 42 is 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 operator to judge the pressure inside the metal pipe 1. When the pressure drops significantly, it indicates that the metal pipe 1 may have a gas leak. The pressure sensor 46 and the gas boosting device 41 are connected 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] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the 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.

2. The spin forming device for machining mechanical parts according to claim 1, characterized in that: It also includes 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), and the adjustment seat includes: 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 part of the internal abutting member.

3. The spin forming device for machining mechanical parts according to claim 2, characterized in that: 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).

4. The spinning forming device for machining mechanical parts according to claim 2 or 3, characterized in that: 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).

5. The spin forming device for machining mechanical parts according to claim 3, characterized in that: 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.

6. The spinning forming device for machining mechanical parts according to claim 4, characterized in that: 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).

7. 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).

8. The spin forming device for machining mechanical parts according to claim 7, 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.

9. The spinning forming device for machining mechanical parts according to claim 8, 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).

10. The spin forming device for machining mechanical parts according to claim 9, 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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