Rotating disc type metal pipe body fluid necking equipment

Abstract

The invention relates to the technical field of metal pipe machining, and particularly discloses rotating disc type metal pipe body fluid necking equipment which comprises a machine body, a lower die part is rotatably arranged on the machine body and provided with at least two lower dies, an upper die part is provided with at least two upper dies, and each upper die is provided with a profiled groove. The heating mechanism comprises a heater and at least two lifting pieces; according to the rotating disc type metal pipe body fluid necking equipment, the lower die part rotates to drive metal pipes to pass through the positions under the upper dies and the heaters one by one, the upper die part is controlled to move downwards to conduct necking and heating on the metal pipes, the deformation amount of ports of the metal pipes can be dispersed through multiple times of necking, the tangential pressure stress of the positions of the pipe openings is reduced, and the machining efficiency is improved. The risk that the metal pipe is unstable and wrinkled is reduced, meanwhile, the springback amount of the metal pipe can be reduced, the port size of the metal pipe after necking is easy to control, in addition, the heater heats the metal pipe, and the internal stress of the metal pipe can be eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe processing, and particularly relates to a rotary metal pipe liquid compression necking device. Background Art

[0002] Metal pipe necking is a forming process that reduces the diameter of the end of a pipe blank. Under the action of an axial force, the pipe blank enters the necking hole of the necking die, and finally forms a reduced end diameter. Necking machines are widely used in the processing and forming of connection parts such as pipe fittings insertion, automotive fuel pipes, air ducts, water pipes, and air-conditioning pipes, and are ideal pipe end forming processing equipment.

[0003] In a Chinese patent document with the publication number CN215392111U, a circular pipe necking device is disclosed, which includes a main body. On one side of the top of the main body, a fixed frame is fixedly installed. On one side of the bottom of the fixed frame, a lower fixed seat is fixedly installed, and a first hydraulic cylinder is fixedly installed directly above the lower fixed seat. The bottom end of the first hydraulic cylinder is fixedly connected to an upper fixed seat. A lower fixed die and an upper fixed die are respectively fixedly installed on the top of the lower fixed seat and the bottom of the upper fixed seat. The main body is fixedly installed with a fixed plate on one side close to the lower fixed seat, and a moving seat is installed between the fixed plate and the lower fixed seat of the main body. One side of the fixed plate is fixedly connected to a second hydraulic cylinder, and the output shaft on one side of the second hydraulic cylinder is fixedly connected to the moving seat. An installation groove is formed on one side of the moving seat, and an extrusion die is fixedly installed in the installation groove. This circular pipe necking device is simple to operate, has high processing efficiency, and has high applicability.

[0004] However, the above technical solution still has the following defects: The above technical solution uses a cold extrusion one-time forming method to neck the metal pipe. The amount of necking deformation is large, the tangential compressive stress at the pipe orifice position is large, and the pipe orifice is prone to tangential instability and wrinkling, and even the pipe orifice is torn. In addition, the barrel wall area that plays a force transmission role is also prone to axial instability and wrinkling due to the action of axial compressive stress, which easily leads to the scrapping of the metal pipe. In addition, the amount of necking deformation is large, and the springback amount will also become large, making it difficult to control the port size of the metal pipe after necking. Summary of the Invention

[0005] The present invention provides a rotary metal pipe liquid compression necking device, aiming to solve the problems in the related technology that the necking method causes a large amount of necking deformation of the metal pipe, the metal pipe is prone to wrinkling and scrapping, and it is difficult to control the port size of the metal pipe after necking.

[0006] The rotary metal pipe liquid compression necking device of the present invention includes a machine body, and further includes: A lower die part, rotatably arranged on the machine body, having at least two lower dies on the lower die part, and a metal pipe can be sleeved on each of the lower dies; The upper die part is movably arranged on the machine body up and down. There are at least two upper dies on the upper die part, and each upper die has a mold cavity. The mold cavity includes a second transition part and a converging part connected to the top of the second transition part. The diameter of the second transition part gradually decreases from bottom to top, and the diameters of the converging parts of all the upper dies along the rotation direction of the lower die part decrease one by one; The heating mechanism includes a heater fixed on the upper die part and at least two lifting parts installed on the lower die part. The number of the lifting parts is the same as the number of the lower dies. Each lifting part can move up and down. Each lifting part is sleeved on each lower die respectively, and the metal pipe sleeved on the lower die falls on the lifting part.

[0007] Preferably, the machine body includes a support, a base is fixed on the support, there is a support protrusion on the base, the support protrusion is annular, the lower die part is slidably arranged on the support protrusion, guide columns are fixed at the four corners of the base, the tops of the four guide columns are jointly fixed with a top seat, a first telescopic driving device is fixed on the top seat, the upper die part is fixed on the movable end of the first telescopic driving device, a rotation driving device is fixed on the support, and the lower die part is fixed on the output end of the rotation driving device.

[0008] Preferably, the lower die part includes a lower template fixed on the output end of the rotation driving device. At least two backing plates are fixed on the lower template, and all the backing plates are evenly distributed around the central axis of the lower template. The number of the backing plates is the same as the number of the lower dies. All the lower dies are respectively welded on all the backing plates. The lower die has a vertical part connected to the backing plate, the top of the vertical part is connected with a first transition part, the first transition part is hemispherical, and the top of the first transition part is connected with a head.

[0009] Preferably, an upper template is also fixed on the upper die part on the movable end of the first telescopic driving device. The upper die includes a mounting head fixed on the upper template. A connecting rod is threadedly connected to the mounting head, and a pressing block is fixed at the bottom of the connecting rod. The mold cavity is opened on the pressing block.

[0010] Preferably, the heating mechanism further includes a second telescopic driving device fixed on the machine body. The movable end of the second telescopic driving device is located directly below the heater. The lifting part includes a sleeve part sleeved on the lower die. The bottom of the sleeve part is connected with a transmission part. Channels for avoiding the transmission part are opened on both the lower template and the backing plate. When the transmission part moves directly above the second telescopic driving device, the second telescopic driving device can extend to push the transmission part upward, and a buffer pad is arranged at the top of the sleeve part.

[0011] Preferably, the turntable type metal pipe liquid compression mouth equipment of the present invention further includes a locking mechanism; The locking mechanism includes a third telescopic driving device fixed on the machine body and at least two lock blocks fixed on the lower template. The number of the lock blocks is the same as the number of the lower dies, and all the lock blocks are evenly distributed around the central axis of the lower template. Each lock block is provided with a slot, and a lock head is fixed on the movable end of the third telescopic driving device. When the third telescopic driving device extends, it can drive the lock head to insert into the slot. When the lock head is inserted into the slot, the upper die is located directly above the lower die.

[0012] Preferably, the turntable type metal pipe liquid compression mouth equipment of the present invention further includes a blanking mechanism; The blanking mechanism includes a fixing plate fixed on the guide post and through holes opened on each connecting rod. The fixing plate is fixed with a limiting member having the same number as the connecting rod, and the position of the limiting member is aligned with the connecting rod one by one. The through hole is communicated with the converging part, the diameter of the through hole is larger than the diameter of the converging part, a ejector rod is slidably arranged in the through hole, the bottom of the ejector rod has a pushing part, the pushing part is slidably arranged in the converging part, the top of the ejector rod has a limiting platform, and the limiting platform is lapped on the top of the connecting rod. The limiting platform is located directly below the limiting member.

[0013] Preferably, the turntable type metal pipe liquid compression mouth equipment of the present invention further includes a plurality of lower matching mechanisms and a plurality of upper matching mechanisms. The number of the lower matching mechanisms is the same as the number of the lower dies, and all the lower matching mechanisms are correspondingly arranged outside all the lower dies. Each lower matching mechanism includes two pushing mechanisms, and the two pushing mechanisms are symmetrical about the central axis of the lower die. The number of the upper matching mechanisms is the same as the number of the upper dies, and all the upper matching mechanisms are correspondingly arranged outside all the upper dies. Each upper matching mechanism includes two lower inserts, and the two lower inserts are symmetrical about the central axis of the upper die; Each lower matching mechanism can move one by one under the upper matching mechanism as the upper die moves. When the lower matching mechanism is placed directly below the upper matching mechanism, the two pushing mechanisms are respectively placed directly below the two lower inserts, and the lower insert moves downward to trigger the pushing mechanism below it to push the metal pipe.

[0014] Preferably, each pushing mechanism includes a bracket fixed on the backing plate. The bracket is fixed with a mounting seat. The mounting seat has a receiving groove and a sliding groove communicated with the receiving groove. A driving bar is slidably arranged in the receiving groove with a single degree of freedom. The top of the driving bar has a driving inclined surface. The lower insert moves downward to press the driving inclined surface to force the driving bar to move. A first elastic member is fixed between the driving bar and the inner wall of the receiving groove. A pressing member is slidably arranged in the sliding groove with a single degree of freedom, and the pressing member is fixed on the driving bar.

[0015] Preferably, the pressing member includes a moving block slidably connected in the chute with a single degree of freedom. A second elastic member is fixedly provided between the moving block and the driving bar. A connecting seat is fixedly provided on one side of the moving block away from the second elastic member, and a roller is rotatably connected to the connecting seat.

[0016] The beneficial effects of the present invention are as follows: During use, the metal tube to be processed is sleeved on the lower die, and the bottom of the metal tube rests on the lifting member. Control the rotation of the lower die part so that the metal tube passes successively directly below each upper die and the heater. Each time it passes through a place, control the upper die part to move down and then up once. The downward movement of the upper die part drives the upper die to move towards the lower die. The groove on the upper die extrudes the metal tube, and the metal tube is guided by the second transition part and converges inward. Finally, the diameter of the top opening of the metal tube shrinks to be the same as the diameter of the converging part. As the lower die part drives the feeding of the metal tube, the metal tube can be successively extruded through the grooves of each upper die, and the metal tube is gradually necked by adopting the method of multiple necking. During this period, driving the lifting member to move upward can lift the metal tube under the heater upward to separate it from the lower die, so that the top opening of the metal tube enters the heating end of the heater for heating. Multiple necking can disperse the deformation amount of the metal tube port, make the deformation on the surface of the metal tube more uniform, reduce the tangential compressive stress at the tube mouth position, and reduce the risk of the metal tube buckling and wrinkling, thereby preventing the scrapping of the metal tube. In addition, by dispersing the deformation amount of the metal tube port, the springback amount of the metal tube can be reduced, and it is easy to control the port size of the metal tube after necking. Heating the top opening of the metal tube by the heater can make the metal tube more likely to undergo plastic deformation during the necking process, be able to withstand a greater degree of deformation without cracking, and at the same time, the internal stress of the metal tube will also be eliminated. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the first embodiment in the present invention.

[0018] Figure 2 is a schematic structural diagram of the body of the first embodiment in the present invention.

[0019] Figure 3 is a schematic structural diagram of the rotation driving device of the first embodiment in the present invention.

[0020] Figure 4 is a schematic structural diagram of the base and the lower die part of the first embodiment in the present invention.

[0021] Figure 5 is a schematic structural diagram of the backing plate and the lower die of the first embodiment in the present invention.

[0022] Figure 6 is a schematic structural diagram of the upper die part and the heater of the first embodiment in the present invention.

[0023] Figure 7 It is a schematic structural diagram of the upper die of the first embodiment in the present invention.

[0024] Figure 8 It is a cross-sectional view of the pressure block and the mold cavity of the first embodiment in the present invention.

[0025] Figure 9 It is a cross-sectional view of the lower template, the backing plate and the lifting member of the first embodiment in the present invention.

[0026] Figure 10 It is an exploded view of the base, the lower template, the backing plate, the lower die, the second telescopic driving device and the lifting member of the first embodiment in the present invention.

[0027] Figure 11 It is a schematic structural diagram of the locking mechanism of the first embodiment in the present invention.

[0028] Figure 12 It is a schematic structural diagram of the upper template, the upper die, the fixing plate and the limiting member of the first embodiment in the present invention.

[0029] Figure 13 It is a schematic structural diagram of the fixing plate, the lead screw and the nut of the first embodiment in the present invention.

[0030] Figure 14 It is a cross-sectional view of the mounting head, the connecting rod, the pressure block and the ejector rod of the first embodiment in the present invention.

[0031] Figure 15 It is a split cross-sectional view of the connecting rod, the pressure block and the ejector rod of the first embodiment in the present invention.

[0032] Figure 16 It is a schematic structural diagram of the second embodiment in the present invention.

[0033] Figure 17 It is a schematic structural diagram of the backing plate and the lower mating mechanism of the second embodiment in the present invention.

[0034] Figure 18 It is a three-dimensional cross-sectional view of the mounting seat of the second embodiment in the present invention.

[0035] Figure 19 It is a schematic structural diagram of the pushing mechanism of the second embodiment in the present invention.

[0036] Figure 20 It is a schematic structural diagram of the upper mating mechanism of the second embodiment in the present invention.

[0037] Reference numerals: 10. Body; 11. Support; 12. Base; 121. Support protrusion; 13. Guide post; 14. Top seat; 15. First telescopic drive device; 16. Rotation drive device; 161. Servo motor; 162. Reducer; 163. First gear; 164. Second gear; 165. Transmission rod; 20. Lower die part; 21. Lower template; 22. Backing plate; 23. Lower die; 231. Vertical part; 232. First transition part; 233. Head; 30. Upper die part; 31. Upper template; 311. Mounting hole; 32. Upper die; 321. Mounting head; 322. Connecting rod; 323. Pressing block; 324. Mold cavity; 3241. Second transition part; 3242. Converging part; 40. Heating mechanism; 41. Heater; 411. Heating coil; 42. Second telescopic drive device; 43. Lifting part; 431. Sleeve part; 432. Transmission part; 433. Buffer pad; 50. Locking mechanism; 51. Third telescopic drive device; 52. Lock block; 521. Slot; 53. Lock head; 60. Stripping mechanism; 61. Fixed plate; 62. Through hole; 63. Limiting part; 631. Lead screw; 632. Nut; 64. Ejector rod; 641. Pushing top; 642. Limiting platform; 70. Lower mating mechanism; 71. Bracket; 72. Mounting seat; 721. Receiving groove; 722. Slide groove; 723. Guide boss; 73. Driving strip; 731. Guide notch; 732. Driving slope; 74. First elastic part; 75. Pressing part; 751. Moving block; 752. Second elastic part; 753. Connecting seat; 754. Roller; 80. Upper mating mechanism; 81. Lower plug-in part; 811. Connecting plate; 812. Plug rod. Detailed implementation mode

[0038] 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 of 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.

[0039] Such as Figures 1 to 15As shown, this is the first embodiment of the rotary metal tube liquid compression mouth equipment of the present invention, including a body 10 to support the entire rotary metal tube liquid compression mouth equipment. A rotatable lower die part 20 is installed on the body 10. There are at least two lower dies 23 on the lower die part 20, and metal tubes can be sleeved on each lower die 23. An upper die part 30 that can move up and down is installed on the body 10. There are at least two upper dies 32 on the upper die part 30. A heating mechanism 40 is installed on the upper die part 30 and the body 10. There is a heater 41 installed on the upper die part 30 on the heating mechanism 40. The rotation of the lower die part 20 can drive the metal tubes on each lower die 23 to be aligned with the heater 41 and each upper die 32 one by one. The downward movement of the upper die part 30 can drive the heater 41 and each upper die 32 to move downward, so that the heater 41 moves downward to heat the metal tube, and the upper die 32 moves downward to extrude the metal tube, thereby shrinking the top opening of the metal tube.

[0040] Reference Figures 1 to 3 As shown, the body 10 includes a support 11 that can be placed on the ground to support the entire body 10. A base 12 is fixedly connected to the support 11. In this embodiment, the base 12 is in the shape of a square plate. There is a support protrusion 121 on the upper surface of the base 12. The support protrusion 121 is annular. Guide columns 13 are fixedly connected to the four corners of the upper surface of the base 12. The four guide columns 13 are parallel to each other, and the central axes of each guide column 13 are perpendicular to the upper surface of the base 12. The tops of the four guide columns 13 are fixedly connected to a top seat 14. A first telescopic driving device 15 is fixedly installed on the top seat 14. In this embodiment, the first telescopic driving device 15 is a hydraulic cylinder. The upper die part 30 is fixedly connected to the movable end of the first telescopic driving device 15. A rotation driving device 16 is fixedly installed on the support 11. The lower die part 20 is fixedly connected to the output end of the rotation driving device 16. The rotation driving device 16 can drive the lower die part 20 to rotate, thereby driving the metal tubes on the lower die part 20 to move. The first telescopic driving device 15 can drive the upper die part 30 to move up and down, and further control the downward movement of the upper die part 30 to approach the lower die part 20. The downward movement of the upper die part 30 and the cooperation with the lower die part 20 can apply pressure to the metal tube, thereby extruding the metal tube on the lower die part 20 to achieve the purpose of shrinking the top pipe orifice of the metal tube.

[0041] Exemplarily, the rotation driving device 16 includes a servo motor 161 fixedly installed on the support 11 and a speed reducer 162. The output end of the servo motor 161 is fixedly connected to the input end of the speed reducer 162. A first gear 163 is fixedly connected to the output end of the speed reducer 162. The teeth of the first gear 163 mesh with a second gear 164. A transmission rod 165 is fixedly connected to the second gear 164. The lower die part 20 is fixedly connected to the transmission rod 165. By starting the servo motor 161, the servo motor 161 can drive the first gear 163 to rotate through the speed reducer 162. The rotation of the first gear 163 can drive the second gear 164 to rotate through the meshing transmission between the first gear 163 and the second gear 164. The rotation of the second gear 164 can drive the lower die part 20 to rotate through the transmission rod 165.

[0042] Reference Figure 1 、 Figures 3 to 5 As shown in the reference

[0043] Reference Figure 1 、 Figures 6 to 8 , the lower die part 20 includes a lower template 21. In this embodiment, the lower template 21 is in a disc shape. The lower surface of the lower template 21 is slidably connected to the upper surface of the support protrusion 121. At the same time, the support protrusion 121 can support the lower template 21. The lower template 21 is fixedly connected to the transmission rod 165. At least two backing plates 22 are fixedly connected to the lower template 21. All the backing plates 22 are evenly distributed around the central axis of the lower template 21. Lower dies 23 are welded to each of the backing plates 22. It should be noted that all the lower dies 23 are also evenly distributed around the central axis of the lower template 21. The lower dies 23 have vertical parts 231 welded to the backing plates 22. The top of the vertical part 231 is connected to a first transition part 232. The first transition part 232 is hemispherical. The top of the first transition part 232 is connected to a head 233. The metal pipe to be processed can be sleeved on the lower die 23. The rotation of the second gear 164 can drive the lower template 21 to rotate through the transmission rod 165. The rotation of the lower template 21 can drive the backing plates 22 and the lower dies 23 to rotate synchronously, and further drive the metal pipe sleeved on the lower die 23 to rotate synchronously to realize the feeding movement of the metal pipe.As shown in the figure, the upper die part 30 includes an upper die plate 31. The upper surface of the upper die plate 31 is fixedly connected to the movable end of the first telescopic driving device 15. In this embodiment, the upper die plate 31 is square, and guide holes are provided at the four corners of the upper die plate 31. The four guide holes of the upper die plate 31 are respectively slidably connected to four guide posts 13, so that the upper die plate 31 can move up and down along the guidance of the guide posts 13. At least two mounting holes 311 are provided on the upper die plate 31, and at least two upper dies 32 are mounted in the at least two mounting holes 311. The upper die 32 includes a mounting head 321 fixedly mounted in the mounting hole 311. A screw hole is provided at the central position of the mounting head 321. A connecting rod 322 is threadedly connected to the screw hole of the mounting head 321. A pressing block 323 is welded to the bottom of the connecting rod 322. A die groove 324 is provided at the central position of the pressing block 323. It should be specifically noted that the die groove 324 includes a second transition part 3241 and a converging part 3242 connected to the top of the second transition part 3241. The diameter of the second transition part 3241 gradually decreases from bottom to top, and finally the top of the second transition part 3241 is connected to the bottom of the converging part 3242. It should be noted that the diameters of the converging parts 3242 in all the pressing blocks 323 are different. Looking along the rotation direction of the lower die part 20, the diameters of the converging parts 3242 in all the pressing blocks 323 gradually decrease one by one.

[0044] When extruding the metal pipe, as the pressing block 323 moves downward, the die groove 324 extrudes the metal pipe, and the metal pipe is guided by the second transition part 3241 on the pressing block 323 and converges inward. Finally, the diameter of the top opening of the metal pipe shrinks to be the same as the diameter of the converging part 3242. As the lower die part 20 drives the feeding of the metal pipe, the metal pipe can be sequentially extruded by each pressing block 323 to gradually reduce the diameter of the metal pipe.

[0045] Reference Figure 1 、 Figure 9 and Figure 10As shown, the heating mechanism 40 includes a heater 41 fixedly installed on the upper template 31, a second telescopic driving device 42 fixedly installed on the base 12, and at least two lifting members 43 installed on the lower template 21. The heater 41 is an electromagnetic induction heater, which has a heating coil 411 thereon. The heater 41 can heat the necking position of the metal tube. In this embodiment, the second telescopic driving device 42 is a cylinder and is located directly below the heating coil 411. The number of the lifting members 43 is the same as that of the lower dies 23, and all the lifting members 43 are sleeved on all the lower dies 23. The metal tube can be placed on the lifting members 43. When the lifting members 43 rotate with the lower template 21 to be directly below the heating coil 411, the second telescopic driving device 42 extends to drive the lifting members 43 to move upward. The upward movement of the lifting members 43 can lift the metal tube upward, so that the top opening of the metal tube is separated from the lower die 23 and enters the heating coil 411 for heating, which can avoid the heating effect of the heating coil 411 on the lower die 23.

[0046] Continue to refer to Figure 9 and Figure 10 As shown, the lifting member 43 includes a sleeve portion 431, which is sleeved on the lower die 23. A transmission portion 432 is connected to the bottom of the sleeve portion 431. Channels for avoiding the transmission portion 432 are provided on both the lower template 21 and the backing plate 22. When the second telescopic driving device 42 extends, the movable end of the second telescopic driving device 42 can contact and push the transmission portion 432 to move upward, thereby driving the entire lifting member 43 to move upward. A buffer pad 433 is fixedly connected to the top of the sleeve portion 431. In this embodiment, the buffer pad 433 is made of rubber material. When the metal tube is sleeved on the lower die 23, it can fall on the buffer pad 433. The buffer pad 433 can buffer the impact of the falling metal tube to weaken the damage and noise caused by the direct impact of the metal tube on the sleeve portion 431, and the buffer pad 433 can support the metal tube.

[0047] Refer to Figure 1 and Figure 11 As shown, the rotary metal tube liquid compression necking device of the present invention further includes a locking mechanism 50. The locking mechanism 50 includes a third telescopic driving device 51 installed on the base 12 and at least two lock blocks 52 fixedly connected to the lower template 21. The number of the lock blocks 52 is the same as that of the lower dies 23, and all the lock blocks 52 are evenly distributed around the central axis of the lower template 21. A slot 521 is provided on each lock block 52. The movable end of the third telescopic driving device 51 is fixedly connected with a lock head 53. The third telescopic driving device 51 can drive the lock head 53 to insert into the slot 521 of the lock block 52. It should be noted that when the lock head 53 is inserted into the slot 521 of the lock block 52, the upper die 32 is located directly above the lower die 23 to ensure that the downward movement of the upper die 32 can cooperate with the lower die 23.

[0048] Exemplarily, the third telescopic driving device 51 includes a cylinder and a slide rail. The output end of the cylinder is fixedly connected with a slider, and the slider is slidably connected to the slide rail. The lock head 53 is fixedly connected to the slider. The slide rail can guide the movement of the slider. When the third telescopic driving device 51 extends, it can drive the slider to slide on the slide rail, so that the lock head 53 is inserted into the slot 521 of the lock block 52. When the third telescopic driving device 51 contracts, it can drive the slider to slide reversely on the slide rail, so that the lock head 53 is disengaged from the slot 521 of the lock block 52.

[0049] Reference Figure 1 、 Figures 12 to 15 As shown in the figure, the rotary metal pipe body liquid compression port device of the present invention further includes a top feeding mechanism 60. The top feeding mechanism 60 includes a fixing plate 61 fixedly installed on four guide posts 13 and through holes 62 opened on each connecting rod 322. A limiting member 63 having the same number as the connecting rods 322 is fixedly connected to the fixing plate 61, and the positions of the limiting members 63 are aligned with the connecting rods 322 one by one. It should be noted that each limiting member 63 includes a lead screw 631, and two nuts 632 are threadedly connected to each lead screw 631, and the two nuts 632 are respectively pressed against the upper and lower sides of the fixing plate 61. The through hole 62 communicates with the converging portion 3242, the diameter of the through hole 62 is larger than the diameter of the converging portion 3242, a top rod 64 is slidably connected in the through hole 62, the bottom of the top rod 64 has a pushing portion 641, the pushing portion 641 is slidably connected in the converging portion 3242, the top of the top rod 64 has a limiting platform 642, and the limiting platform 642 is lapped on the top of the connecting rod 322, and the limiting platform 642 is located directly below the lead screw 631.

[0050] When the pressing block 323 follows the lower template 31 to move downwards and presses the metal pipe, the top port of the metal pipe enters the converging portion 3242 for contraction, and pushes the pushing portion 641 of the top rod 64 to move the entire top rod 64 upwards. At this time, the top port of the metal pipe will abut against the inside of the converging portion 3242. When the pressing block 323 follows the upper template 31 to move upwards, the metal pipe abutting against the inside of the converging portion 3242 will move upwards together with the pressing block 323. The limiting platform 642 on the top rod 64 moves upwards and can contact the lead screw 631 above it. The lead screw 631 prevents the limiting platform 642 from moving upwards and causes the top rod 64 to move downwards relative to the pressing block 323. The pushing portion 641 on the top rod 64 then pushes the metal pipe inside the converging portion 3242, pushing out the metal pipe inside the converging portion 3242 and falling onto the lower die 23 again to prevent the metal pipe from remaining on the pressing block 323.

[0051] During use, the metal pipe to be processed is sleeved on the lower die 23, and the bottom of the metal pipe lands on the lifting member 43. The rotation drive device 16 is controlled to drive the lower die part 20 to rotate, so that the metal pipe passes successively under the respective upper dies 32 and the heating coil 411. Each time it passes through a position, the first telescopic drive device 15 is controlled to drive the upper die part 30 to move downwards and then upwards once. When the upper die part 30 moves downwards, it drives the upper die 32 to move towards the lower die 23. The pressing block 323 on the upper die 32 moves downwards to squeeze the metal pipe. The metal pipe is guided by the second transition part 3241 on the pressing block 323 and converges inwards. At the same time, the first transition part 232 restricts the contraction part of the metal pipe to prevent the contraction part of the metal pipe from shrinking excessively. Finally, the diameter of the top opening of the metal pipe shrinks to be the same as the diameter of the converging part 3242. In addition, when the upper die part 30 moves upwards, the metal pipe against the inside of the converging part 3242 will move upwards together with the pressing block 323. When the upper die part 30 moves upwards, the limiting platform 642 on the ejector rod 64 moves upwards and can contact the lead screw 631 above it. The lead screw 631 prevents the limiting platform 642 from moving upwards, causing the ejector rod 64 to move downwards relative to the pressing block 323. The pushing part 641 on the ejector rod 64 then pushes the metal pipe inside the converging part 3242, pushing out the metal pipe inside the converging part 3242, and the metal pipe lands on the lower die 23 again, preventing the metal pipe from remaining on the pressing block 323. As the lower die part 20 drives the feeding of the metal pipe, the metal pipe can be successively squeezed by each pressing block 323 to gradually reduce the diameter of the metal pipe. Multiple necking operations can disperse the deformation amount at the port of the metal pipe, make the deformation on the surface of the metal pipe more uniform, reduce the tangential compressive stress at the pipe orifice position, reduce the risk of the metal pipe buckling and wrinkling due to instability, and further prevent the metal pipe from being scrapped. In addition, by dispersing the deformation amount at the port of the metal pipe, the springback amount of the metal pipe is reduced, making it easy to control the port size of the metal pipe after necking.

[0052] On the other hand, when the upper die part 30 moves downwards to squeeze the metal pipe, the second telescopic drive device 42 is controlled to extend. When the second telescopic drive device 42 extends, it can drive the lifting member 43 to move upwards. When the lifting member 43 moves upwards, it can lift the metal pipe below the heating coil 411 upwards, so that the top opening of the metal pipe enters the heating coil 411 for heating. Heating can intensify the thermal motion of metal atoms and weaken the binding force between atoms, so that the metal pipe is more likely to undergo plastic deformation during the necking process, can withstand a greater degree of deformation without defects such as cracking, and at the same time, heating can also eliminate the internal stress generated during the previous processing or placement of the metal pipe, preventing quality problems such as cracks in the material due to the superposition of internal stress and necking stress during the necking process. Moreover, a uniform microstructure and stress state are beneficial to ensuring the deformation uniformity of the metal pipe during the necking process and improving the necking quality of the metal pipe.

[0053] In the above embodiment, after the metal tube is pushed out by the ejector mechanism 60, it will fall outside the lower mold 23. The falling metal tube is prone to tilt, and the tilted metal tube may be misaligned with the next upper mold 32, easily causing the metal tube to be squeezed and scrapped. Therefore, a second embodiment is proposed to overcome the above problems.

[0054] As Figures 16 to 20 shown, this is the second embodiment of the rotary metal tube body liquid compression port device of the present invention. The difference from the above embodiment is that in the second embodiment, it further includes a plurality of lower matching mechanisms 70 and a plurality of upper matching mechanisms 80. The number of the lower matching mechanisms 70 is the same as the number of the lower molds 23, and all the lower matching mechanisms 70 are correspondingly arranged outside all the lower molds 23 one by one. The number of the upper matching mechanisms 80 is the same as the number of the upper molds 32, and all the upper matching mechanisms 80 are correspondingly arranged outside all the upper molds 32 one by one. When the upper matching mechanism 80 moves downward, it can drive the lower matching mechanism 70 to straighten the metal tube.

[0055] Referring to Figures 16 to 19 shown, each lower matching mechanism 70 includes two pushing mechanisms. The two pushing mechanisms are symmetric about the center axis of the lower mold 23. Each pushing mechanism includes a bracket 71 fixedly connected to the backing plate 22. The top of the bracket 71 is welded with a mounting seat 72. The mounting seat 72 has a receiving groove 721 and a sliding groove 722 communicating with the receiving groove 721. A driving bar 73 is slidably connected with a single degree of freedom in the receiving groove 721. Specifically, the inner wall of the receiving groove 721 has a guiding boss 723. The driving bar 73 is provided with a guiding notch 731 that fits with the guiding boss 723. The guiding notch 731 is restricted to slide on the outer wall of the guiding boss 723, so that the driving bar 73 can be restricted to slide with a single degree of freedom in the receiving groove 721. The top of the driving bar 73 has a driving inclined surface 732 for cooperating with the upper matching mechanism 80. A first elastic member 74 is fixedly connected between the driving bar 73 and the inner wall of the receiving groove 721. In this embodiment, the first elastic member 74 is a spring. A pressing member 75 is slidably connected with a single degree of freedom in the sliding groove 722. The pressing member 75 is fixedly connected to the driving bar 73. When controlling the driving bar 73 to move against the elastic force of the first elastic member 74, the driving bar 73 can drive the pressing member 75 to move towards the metal tube. Under the combined action of the two pushing mechanisms in the same lower matching mechanism 70, the two pressing members 75 approach each other and push the metal tube, thereby being able to straighten the metal tube.

[0056] Continuing to refer to Figure 19As shown in the figure, the pressing member 75 includes a moving block 751 that is slidably connected with a single degree of freedom in the chute 722. A second elastic member 752 is fixedly connected between the moving block 751 and the driving bar 73. In this embodiment, the second elastic member 752 is a spring. A connecting seat 753 is welded to the side of the moving block 751 away from the second elastic member 752. A roller 754 is rotatably connected to the connecting seat 753 through a bearing. The outer contour of the roller 754 is concave. When the driving bar 73 drives the pressing member 75 to move and push against the metal tube, the second elastic member 752 will be compressed to prevent the pressing member 75 from damaging the metal tube. Using the elastic force of the second elastic member 752, the metal tube is pushed through the moving block 751, the connecting seat 753 and the roller 754 to straighten the metal tube. At the same time, the concave outer side of the roller 754 can limit the outer side of the metal tube, which is beneficial to straightening the metal tube.

[0057] Reference Figure 16 and Figure 20 As shown in the figure, each upper matching mechanism 80 includes two lower inserts 81. The two lower inserts 81 are symmetrical about the center axis of the upper die 32. When the lower die 23 is aligned with the upper die 32, the two pushing mechanisms beside the lower die 23 are respectively aligned with the two lower inserts 81 beside the upper die 32. Each lower insert 81 includes a connecting plate 811 fixedly connected to the upper template 31. A plug rod 812 is welded to the bottom of the connecting plate 811. When the lower insert 81 moves downward, the plug rod 812 can contact and press against the driving inclined surface 732 on the driving bar 73, so that the lower insert 81 moves downward along the driving inclined surface 732, thereby forcing the entire driving bar 73 to achieve the moving function.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary metal tube body liquid compression port device, comprising a machine body (10), characterized in that, Further included are: A lower die part (20) rotatably arranged on the machine body (10), with at least two lower dies (23) provided on the lower die part (20), and a metal tube can be sleeved on each of the lower dies (23); An upper die part (30) vertically movably arranged on the machine body (10), with at least two upper dies (32) provided on the upper die part (30), and each of the upper dies (32) has a mold cavity (324). The mold cavity (324) includes a second transition part (3241) and a converging part (3242) connected to the top of the second transition part (3241). The diameter of the second transition part (3241) gradually decreases from bottom to top, and the diameters of the converging parts (3242) of all the upper dies (32) along the rotation direction of the lower die part (20) decrease one by one; A heating mechanism (40), including a heater (41) fixed on the upper die part (30) and at least two lifting members (43) installed on the lower die part (20). The number of the lifting members (43) is the same as that of the lower dies (23). Each of the lifting members (43) can move up and down, and each of the lifting members (43) is respectively sleeved on each of the lower dies (23), and the metal tube sleeved on the lower die (23) falls on the lifting member (43).

2. The turntable type metal tube body liquid compression port device according to claim 1, wherein The machine body (10) includes a support (11), a base (12) is fixed on the support (11), a support protrusion (121) is provided on the base (12), the support protrusion (121) is annular, the lower die part (20) is slidably arranged on the support protrusion (121), guide columns (13) are fixed at the four corners of the base (12), a top seat (14) is jointly fixed at the tops of the four guide columns (13), a first telescopic driving device (15) is fixed on the top seat (14), the upper die part (30) is fixed at the movable end of the first telescopic driving device (15), a rotation driving device (16) is fixed on the support (11), and the lower die part (20) is fixed at the output end of the rotation driving device (16).

3. The rotary metal tube liquid compression port device according to claim 2, characterized in that, The lower die part (20) includes a lower template (21) fixed at the output end of the rotation driving device (16), at least two backing plates (22) are fixed on the lower template (21), all the backing plates (22) are evenly distributed around the central axis of the lower template (21), the number of the backing plates (22) is the same as that of the lower dies (23), all the lower dies (23) are respectively welded to all the backing plates (22), the lower die (23) has a vertical part (231) connected to the backing plate (22), the top of the vertical part (231) is connected with a first transition part (232), the first transition part (232) is hemispherical, and the top of the first transition part (232) is connected with a head (233).

4. The turntable type metal tube liquid compression port device according to claim 1, characterized in that, On the upper die part (30), there is also an upper template (31) fixed to the movable end of the first telescopic driving device (15). The upper die (32) includes a mounting head (321) fixed to the upper template (31). A connecting rod (322) is threadedly connected to the mounting head (321). A pressing block (323) is fixed to the bottom of the connecting rod (322). The mold cavity (324) is formed on the pressing block (323).

5. The turntable type metal pipe liquid compression port device according to claim 3, characterized in that, The heating mechanism (40) further includes a second telescopic driving device (42) fixed to the machine body (10). The movable end of the second telescopic driving device (42) is located directly below the heater (41). The lifting member (43) includes a sleeve portion (431). The sleeve portion (431) is sleeved on the lower die (23). A transmission portion (432) is connected to the bottom of the sleeve portion (431). Channels for avoiding the transmission portion (432) are formed on both the lower template (21) and the backing plate (22). When the transmission portion (432) moves to directly above the second telescopic driving device (42), the second telescopic driving device (42) can extend to push the transmission portion (432) upward. A buffer pad (433) is provided at the top of the sleeve portion (431).

6. The turntable type metal tube liquid compression port device according to claim 1, characterized in that, It further includes a locking mechanism (50); The locking mechanism (50) includes a third telescopic driving device (51) fixed to the machine body (10) and at least two locking blocks (52) fixed to the lower template (21). The number of the locking blocks (52) is the same as the number of the lower dies (23). All the locking blocks (52) are evenly distributed around the central axis of the lower template (21). A slot (521) is formed on each of the locking blocks (52). A lock head (53) is fixed to the movable end of the third telescopic driving device (51). When the third telescopic driving device (51) extends, it can drive the lock head (53) to insert into the slot (521). When the lock head (53) is inserted into the slot (521), the upper die (32) is located directly above the lower die (23).

7. The turntable type metal pipe body liquid compression port device according to claim 1, characterized in that, It further includes a blanking mechanism (60); The blanking mechanism (60) includes a fixing plate (61) fixed to the guide post (13) and through holes (62) formed on each connecting rod (322). A limiting member (63) having the same number as the connecting rods (322) is fixed to the fixing plate (61). And the positions of the limiting members (63) are aligned with the connecting rods (322) one by one. The through holes (62) communicate with the converging portion (3242). The diameter of the through holes (62) is larger than the diameter of the converging portion (3242). A ejector rod (64) is slidably arranged in the through holes (62). The bottom of the ejector rod (64) has a pushing portion (641). The pushing portion (641) is slidably arranged in the converging portion (3242). The top of the ejector rod (64) has a limiting platform (642). And the limiting platform (642) is lapped on the top of the connecting rod (322). The limiting platform (642) is located directly below the limiting member (63).

8. The rotary metal tube body liquid compression port device according to any one of claims 1-7, characterized in that, It further includes a plurality of lower mating mechanisms (70) and a plurality of upper mating mechanisms (80). The number of the lower mating mechanisms (70) is the same as the number of the lower molds (23), and all the lower mating mechanisms (70) are respectively arranged outside all the lower molds (23) in one-to-one correspondence. Each of the lower mating mechanisms (70) includes two pushing mechanisms, and the two pushing mechanisms are axisymmetric about the center axis of the lower mold (23). The number of the upper mating mechanisms (80) is the same as the number of the upper molds (32), and all the upper mating mechanisms (80) are respectively arranged outside all the upper molds (32) in one-to-one correspondence. Each of the upper mating mechanisms (80) includes two lower plug-ins (81), and the two lower plug-ins (81) are axisymmetric about the center axis of the upper mold (32). Each of the lower mating mechanisms (70) can move one by one under the upper mold (32) and pass directly below each of the upper mating mechanisms (80). When the lower mating mechanism (70) is directly below the upper mating mechanism (80), the two pushing mechanisms are respectively directly below the two lower plug-ins (81). The downward movement of the lower plug-in (81) can trigger the pushing mechanism below it to push the metal tube.

9. The turntable type metal pipe body liquid compression port device according to claim 8, characterized in that, Each of the pushing mechanisms includes a bracket (71) fixed on the backing plate (22). An installation seat (72) is fixed on the bracket (71). The installation seat (72) has a receiving groove (721) and a sliding groove (722) communicating with the receiving groove (721). A driving bar (73) is slidably arranged with a single degree of freedom in the receiving groove (721). The top of the driving bar (73) has a driving inclined surface (732). The downward movement of the lower plug-in (81) can press the driving inclined surface (732) to force the driving bar (73) to move. A first elastic member (74) is fixed between the driving bar (73) and the inner wall of the receiving groove (721). A pressing member (75) is slidably arranged with a single degree of freedom in the sliding groove (722), and the pressing member (75) is fixed on the driving bar (73).

10. The turntable type metal pipe body liquid compression port device according to claim 9, characterized in that, The pressing member (75) includes a moving block (751) slidably connected with a single degree of freedom in the sliding groove (722). A second elastic member (752) is fixed between the moving block (751) and the driving bar (73). A connecting seat (753) is fixed on one side of the moving block (751) away from the second elastic member (752). A roller (754) is rotatably connected to the connecting seat (753).

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