Aluminum alloy thin-walled pipe cold-drawing forming reducing device

Abstract

The application discloses an aluminum alloy thin-walled pipe cold-drawing forming reducing device, relates to the technical field of pipe cold-drawing, and aims to solve the technical problem of insufficient functionality of a traditional cold-drawing device, comprising a forming machine body; an auxiliary driving rail frame is arranged on the forming machine body; and a tensioning driving assembly is arranged at both ends of the auxiliary driving rail frame. The application forms a stage type drawing treatment through the guiding forming through a die, a decreasing die and a limiting die axial inner wall gap, and the multi-die stage drawing gradually deforms the pipe under the continuous action of multiple dies, and the work hardening process is more uniform. Compared with single-die large deformation drawing, the multi-stage drawing avoids the problem of uneven work hardening caused by excessive deformation in the local area of the pipe; the uniform work hardening can improve the overall strength and hardness of the pipe, and meanwhile, the toughness is maintained, so that the pipe has better comprehensive performance in subsequent use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe cold drawing, more particularly to an aluminum alloy thin-walled pipe cold drawing forming and reducing device. BACKGROUND

[0002] The reducing device belongs to the technical field of metal plastic processing. In the manufacturing process of aluminum alloy thin-walled pipes, cold drawing forming is a common reducing method, which makes the pipe pass through the die through drawing force to realize the reduction of the outer diameter, the control of the wall thickness and the optimization of the internal organization.

[0003] However, the existing cold drawing technology has multiple technical bottlenecks. First, single-die large deformation drawing easily leads to uneven local work hardening of the pipe, affecting the consistency of mechanical properties. Second, the traditional device relies on the front-end hydraulic clamping to provide the drawing force, which causes the waste of the pipe end material. In addition, there is a lack of synchronous correction mechanism for the inner wall of the pipe during the forming process, which easily causes the roughness or size deviation of the inner wall.

[0004] In view of the above problems, the existing technology attempts to use multi-stage die progressive drawing, but the die layout is fixed, which is difficult to dynamically adapt to different pipe specifications, and the uneven distribution of pushing and pulling forces easily causes the pipe to twist or break. The present application integrates the front-pulling and rear-pushing driving, adjustable die set and differential transmission system through innovative structural design, aiming to realize the efficient and high-precision reducing processing of thin-walled pipes. In view of this, we propose an aluminum alloy thin-walled pipe cold drawing forming and reducing device. SUMMARY

[0005] The present application aims to provide an aluminum alloy thin-walled pipe cold drawing forming and reducing device to solve the technical problem of insufficient functionality of the traditional cold drawing device.

[0006] To solve the above technical problems, the present application provides the following technical solutions: an aluminum alloy thin-walled pipe cold-drawing forming reducing device, comprising a forming machine body; an auxiliary driving rail frame is arranged on the forming machine body; a tensioning driving assembly is arranged at both ends of the auxiliary driving rail frame; the tensioning driving assembly is drivingly connected through chain belt A and chain belt B; control suspension frames are arranged at both sides of the top of the forming machine body; a driving guide rail is arranged between the two control suspension frames; a plurality of fixed forming connecting seats, a plurality of sliding connecting seats and a force bearing seat are arranged on the driving guide rail; wherein, a stroke control hydraulic cylinder is further arranged on the auxiliary driving rail frame through a fixing seat; the movable end of the stroke control hydraulic cylinder is connected with any one of the sliding connecting seats; the bottom of the driving guide rail is provided with a scissor linkage mechanism; the folding fixed end of the scissor linkage mechanism is arranged on any one of the fixed forming connecting seats; the sliding connecting seats are sequentially arranged at the other end of the scissor linkage mechanism; the fixed forming connecting seats are connected through a guide forming through die; the bottom of the sliding connecting seat is provided with a decreasing die; the bottom of the force bearing seat is provided with a limiting die; the axial inner wall gap between the guide forming through die, the decreasing die and the limiting die constitutes a decreasing drawing through forming cavity; an inner wall maintaining forming auxiliary shaft core is arranged in the decreasing drawing through forming cavity; the end of the inner wall maintaining forming auxiliary shaft core is fixedly connected with the chain belt A through a connecting seat A; a connecting pulling shaft is arranged in the inner wall maintaining forming auxiliary shaft core; the end of the connecting pulling shaft is fixedly connected with the chain belt B through a connecting seat B; a push shaft rod is threadedly connected at the other end of the connecting pulling shaft; and the end of the push shaft rod is fixedly connected with the chain belt B through a connecting seat C.

[0007] The guide forming through die, the decreasing die and the limiting die axially form a decreasing drawing through forming cavity, which is provided with a stage type drawing process; the multi-die stage drawing gradually deforms the pipe under the continuous action of multiple dies, and the work hardening process is more uniform. Compared with single-die large deformation drawing, the multi-stage drawing avoids the problem of uneven work hardening caused by excessive deformation in the local area of the pipe; uniform work hardening can improve the overall strength and hardness of the pipe, while maintaining certain toughness, so that the pipe has better comprehensive performance in subsequent use.

[0008] Preferably, the tensioning drive assembly comprises drive shafts arranged on both sides of the auxiliary drive rail frame through bearings; drive sprockets for driving connection with the chain belts A and B are arranged on the drive shafts; wherein a differential drive mechanism is arranged between the two drive sprockets on at least one side; the differential drive mechanism comprises a drive seat fixed to the forming machine body; a drive gear disc is rotatably arranged on the drive seat; a connecting hinge seat is arranged at the end of the drive gear disc; a central meshing drive gear is arranged on the connecting hinge seat; a synchronous meshing drive gear is arranged on the drive gear disc axially opposite to the two drive sprockes; the synchronous meshing drive gear is fixedly connected with the drive sprocket, and the central meshing drive gear is meshingly connected with the synchronous meshing drive gear; wherein the drive gear disc is driven by a hydraulic motor driving device arranged on the lower side of the forming machine body.

[0009] Preferably, the guide forming through die is a hollow structure, and the inner wall diameter of the guide forming through die is greater than or equal to the outer wall diameter of the aluminum alloy pipe raw material, and the guide forming through die is a long axis structure, and the aluminum alloy pipe raw material passes through while maintaining the levelness.

[0010] Preferably, the number of the decreasing dies is at least two; the inner wall opening end of the decreasing die close to the guide forming through die has the same diameter as the inner wall of the guide forming through die; and the diameters of the two connected forming channels of the decreasing die are decreasing.

[0011] Preferably, the inner wall diameter of the limiting die is smaller than the outer wall diameter of the aluminum alloy thin-walled pipe, so that the formed end of the aluminum alloy thin-walled pipe is limited from advancing after contacting the limiting die.

[0012] Preferably, the tensioning drive assembly drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall maintaining forming auxiliary shaft core, the connecting pulling shaft and the pushing shaft rod are synchronously pushed to pass through the decreasing drawing forming cavity, forming a front-pulling and rear-pushing maintaining type forming structure for the aluminum alloy thin-walled pipe.

[0013] Preferably, the stroke control hydraulic cylinder stroke movement drives the decreasing die, and under the folding drive of the shear type connecting rod mechanism, the sliding connecting seat forms a relative passing structure close to the guide forming through die.

[0014] Preferably, the tensioning drive assembly drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall keeps the auxiliary shaft core of the forming, the connecting pulling shaft and the pushing shaft rod are synchronously pushed to drive the aluminum alloy pipe raw material to pass through the decreasing drawing through the forming cavity, and the aluminum alloy thin-walled pipe forming end is limited to move forward after contacting the limiting die, and the chain belt A continuously drives the inner wall keeps the auxiliary shaft core to pass through the inner wall of the aluminum alloy thin-walled pipe to form the inner wall correction structure under the differential transmission driving of the tensioning drive assembly.

[0015] A method for using an aluminum alloy thin-walled pipe cold-drawing forming reducing device, comprising the following steps:

[0016] S100, pretreatment: first, the levelness of the driving guide rail is adjusted by controlling the suspension frame to ensure that the forming body is in a stable working state; the aluminum alloy wall pipe raw material is sent into the entrance end of the guide forming through die, the inner diameter of the die is slightly larger than the outer diameter of the pipe, and the guide forming through die plays a preliminary guiding role;

[0017] S200, basic drawing treatment: the differential mechanism is driven by the hydraulic motor to make the chain belts A and B move synchronously, the chain belt B drives the connecting pulling shaft to pull the pipe from the front end and the pushing shaft rod to push the pipe from the rear end; at the same time, the chain belt A pulls the inner wall keeps the auxiliary shaft core to draw the pipe from the front end, forming a resultant force of pulling from the front end and pushing from the rear end;

[0018] S300, two-stage extrusion passing treatment: the movable end of the stroke control hydraulic cylinder pushes any one of the sliding connecting seats to move along the driving guide rail; under the folding action of the shear link mechanism, all the decreasing dies on the sliding connecting seats are close to each other on the side of the guide forming through die, forming a radial compression force;

[0019] S400, correction treatment: when the front end of the pipe reaches the limiting die at the bottom of the force receiving seat, the pipe is forced to stop because the inner diameter of the limiting die is smaller than the outer diameter of the pipe; at this time, the differential drive mechanism is switched: the chain belt B is paused, and the chain belt A moves to drive the inner wall keeps the auxiliary shaft core to continue to move forward inside the stationary pipe.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1. The guide forming through die, the decreasing die and the limiting die form an axial inner wall gap decreasing drawing through forming cavity setting to form a stage type drawing treatment, and the multi-die stage drawing makes the pipe gradually deform under the continuous action of multiple dies, and the work hardening process is more uniform. Compared with single-die large deformation drawing, the multi-stage drawing avoids the problem of uneven work hardening caused by excessive deformation in the local area of the pipe; uniform work hardening can improve the overall strength and hardness of the pipe, while maintaining certain toughness, so that the pipe has better comprehensive performance in subsequent use.

[0022] 2、The present application is provided by differential drive mechanism, chain A and chain B are set with the inner wall holding forming auxiliary shaft core, connecting pull shaft and push shaft rod, forming two different motion states, one is chain A and chain B synchronous holding traction push motion state, one is only driving the inner wall holding forming auxiliary shaft core through the motion state.

[0023] 3、The present application is provided by layer by layer decreasing way to the aluminum alloy pipe material raw material step by step drawing reducing diameter to form the required final size, through the process of step by step drawing is beneficial to the homogenization of metal internal organization. In multi-stage drawing, under the action of each die, metal atoms have more time to rearrange and diffuse, so that the metal organization is more fine and uniform. This uniform metal organization can improve the mechanical properties, corrosion resistance and fatigue properties of the pipe, prolong the service life of the pipe.

[0024] 4、The present application is provided by limiting die, so that the aluminum alloy thin-walled pipe cannot pass through the limit work, and the aluminum alloy thin-walled pipe cannot move axially during the inner wall correction process, so as to reduce the adverse conditions caused by synchronous following movement.

[0025] 5、The present application is provided by connecting pull shaft, push shaft rod, so that the aluminum alloy thin-walled pipe cold drawing forming reducing diameter device has forward pulling driving effect and rear end pushing force at the same time, through this way, the aluminum alloy thin-walled pipe cold drawing forming reducing diameter device is relatively complete, and there is no waste of hydraulic clamping.

[0026] 6、The present application is provided by movable die, so that the aluminum alloy thin-walled pipe cold drawing forming reducing diameter device can form the third force for processing aluminum alloy pipe during the above-mentioned forward pulling and rear pushing movement, so as to optimize the large pulling and pushing force caused by step-by-step cold drawing forming reducing diameter, improve the processing efficiency and stability.

[0027] 7、The present application is provided by tensioning drive assembly driving in single motion state, by reasonable control of motion distance, so that the aluminum alloy thin-walled pipe cold drawing forming reducing diameter device can form the sequence movement of external shaping and inner wall auxiliary correction under the condition of keeping the whole pipe intact, effectively improve the functionality of the cold drawing forming reducing diameter device. DETAILED DESCRIPTION

[0028] Figure 1 It is the overall three-dimensional structure schematic diagram of the present application;

[0029] Figure 2 It is the internal structure schematic diagram of the auxiliary drive rail frame of the present application;

[0030] Figure 3 For the drive guide rail structure of the application schematic diagram;

[0031] Figure 4 For the drive guide rail structure of the application schematic diagram; Figure 2 For the drive guide rail structure of the application schematic diagram;

[0032] Figure 5 For the drive guide rail structure of the application schematic diagram;

[0033] Figure 6 For the drive guide rail structure of the application schematic diagram;

[0034] Figure 7 For the drive guide rail structure of the application schematic diagram.

[0035] Figure label explanation:

[0036] 1, forming body; 2, auxiliary drive rail frame; 3, tensioning drive assembly; 301, drive shaft; 302, drive sprocket; 303, drive seat; 304, drive tooth disc; 3041, connecting articulated seat; 305, central meshing drive gear; 306, synchronous meshing drive gear; 5, control suspension frame; 6, drive guide rail; 601, fixed forming connecting seat; 602, sliding connecting seat; 603, force receiving seat; 609, stroke control hydraulic cylinder; 7, shear link mechanism; 8, guide forming through die; 9, decreasing die; 10, limit die; 11, inner wall retaining forming auxiliary shaft core; 12, connecting pulling shaft; 13, push shaft rod. DETAILED DESCRIPTION

[0037] Example 1, as Figures 1 to 7The application relates to a cold-drawing forming reducing device for an aluminum alloy thin-wall pipe, which comprises a forming machine body 1, an auxiliary driving rail frame 2 arranged on the forming machine body 1, a tensioning driving assembly 3 arranged at the two ends of the auxiliary driving rail frame 2, chain belts A and B in transmission connection with the tensioning driving assembly 3, control suspension frames 5 arranged at the top of the two sides of the forming machine body 1, a driving guide rail 6 arranged between the two control suspension frames 5, a plurality of fixed forming connecting seats 601, a plurality of sliding connecting seats 602 and a stress receiving seat 603 arranged on the driving guide rail 6, wherein a stroke control hydraulic cylinder 609 is further arranged on the auxiliary driving rail frame 2 through a fixing seat, the movable end of the stroke control hydraulic cylinder 609 is connected with any one of the sliding connecting seats 602, a shear type connecting rod mechanism 7 is arranged at the bottom of the driving guide rail 6, the folding fixing end of the shear type connecting rod mechanism 7 is arranged on any one of the fixed forming connecting seats 601, the sliding connecting seats 602 are sequentially arranged at the other end of the shear type connecting rod mechanism 7, the fixed forming connecting seats 601 are connected through a guide forming through die 8, the bottom of each of the sliding connecting seats 602 is provided with a decreasing die 9, the bottom of the stress receiving seat 603 is provided with a limiting die 10, the axial inner wall gaps among the guide forming through die 8, the decreasing die 9 and the limiting die 10 constitute a decreasing type drawing through forming cavity, an inner wall maintaining forming auxiliary shaft core 11 is arranged in the decreasing type drawing through forming cavity, the end of the inner wall maintaining forming auxiliary shaft core 11 is fixedly connected with the chain belt A through a connecting seat A, a connecting pulling shaft 12 is arranged in the inner wall maintaining forming auxiliary shaft core 11, the end of the connecting pulling shaft 12 is fixedly connected with the chain belt B through a connecting seat B, a push shaft rod 13 is threadedly connected with the other end of the connecting pulling shaft 12, and the end of the push shaft rod 13 is fixedly connected with the chain belt B through a connecting seat C. The guide forming through die 8, the decreasing die 9 and the limiting die 10 are arranged in the axial inner wall gaps to form the decreasing type drawing through forming cavity, so that a stage type drawing treatment is formed, the multi-die stage drawing makes the pipe gradually deform under the continuous action of the multiple dies, and the work hardening process is more uniform. Compared with the single-die large deformation drawing, the multi-stage drawing avoids the problem that the work hardening is uneven due to excessive deformation of the local area of the pipe; the uniform work hardening can improve the overall strength and hardness of the pipe, and meanwhile keeps certain toughness, so that the pipe has better comprehensive performance in subsequent use.

[0038] In the embodiment of the present application, the tensioning drive assembly 3 comprises a drive shaft 301 arranged on both sides of the auxiliary drive rail frame 2 through bearings; the drive shaft 301 is provided with a drive sprocket 302 for driving connection of the chain belts A and B; wherein a differential drive mechanism is arranged between the two drive sprockets 302 on at least one side; the differential drive mechanism comprises a drive seat 303 fixed on the forming machine body 1; the drive seat 303 is rotatably provided with a drive tooth disc 304; the end of the drive tooth disc 304 is provided with a connecting hinge seat 3041; the connecting hinge seat 3041 is provided with a central meshing drive gear 305; the drive tooth disc 304 is axially provided with a synchronous meshing drive gear 306 on the opposite surface of the two drive sprockets 302; the synchronous meshing drive gear 306 is fixedly connected with the drive sprocket 302, and the central meshing drive gear 305 is meshingly connected with the synchronous meshing drive gear 306; wherein the drive tooth disc 304 is driven by the hydraulic motor driving device arranged on the lower side of the forming machine body 1. The differential drive mechanism is arranged in the present application, and the chain belts A and B are arranged with the inner wall retaining forming auxiliary shaft core 11, the connecting pulling shaft 12 and the push shaft rod 13 respectively, forming two different motion states, one is the synchronous traction and pushing motion state of the chain belts A and B, and the other is the motion state of driving only the inner wall retaining forming auxiliary shaft core 11 to pass out.

[0039] In the embodiment of the present application, the guide forming through die 8 is a hollow structure, and the inner wall diameter of the guide forming through die 8 is greater than or equal to the outer wall diameter of the aluminum alloy pipe raw material, and the guide forming through die 8 is a long shaft structure, which keeps the aluminum alloy pipe raw material horizontal.

[0040] In the embodiment of the present application, the number of the tapering dies 9 is at least two; the inner wall opening end of the tapering die 9 close to the guide forming through die 8 is the same as the inner wall diameter of the guide forming through die 8; and the inner wall forming channel diameters of the two connected tapering dies 9 are tapering. The present application gradually reduces the diameter of the aluminum alloy pipe raw material through the layer-by-layer tapering method to form the required final size, and the gradual drawing process is beneficial to the homogenization of the metal internal organization. In multi-stage drawing, the metal atoms have more time to rearrange and diffuse under the action of each die, so that the metal organization is more fine and uniform. Such uniform metal organization can improve the mechanical properties, corrosion resistance and fatigue performance of the pipe, and prolong the service life of the pipe.

[0041] In the embodiment of the present application, the inner wall of the limiting die 10 is smaller in diameter than the outer wall of the aluminum alloy thin-walled pipe, so that the formed end of the aluminum alloy thin-walled pipe is limited from advancing after contacting the limiting die 10. The present application is provided with the limiting die 10, so that the aluminum alloy thin-walled pipe cannot pass through the forming limitation, and effectively prevents the aluminum alloy thin-walled pipe from moving axially during the inner wall correction process, thereby reducing the adverse conditions caused by synchronous movement.

[0042] In the embodiment of the present application, the tensioning drive assembly 3 drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall maintaining forming auxiliary shaft core 11, the connecting pulling shaft 12 and the pushing shaft rod 13 synchronously push the aluminum alloy pipe raw material through the gradually decreasing drawing through the forming cavity, thereby forming a front-pulling and rear-pushing maintaining type forming structure for the aluminum alloy thin-walled pipe. The present application is provided with the connecting pulling shaft 12 and the pushing shaft rod 13, so that the aluminum alloy thin-walled pipe cold-drawing forming reducing device has both forward pulling force driving effect and rear-end pushing force, thereby effectively improving the overall pipe integrity of the cold-drawing processing device and preventing the waste caused by hydraulic clamping.

[0043] In the embodiment of the present application, the stroke control hydraulic cylinder 609 drives the gradually decreasing die 9 to move in stroke, and under the folding drive of the shear type connecting rod mechanism 7, the sliding connecting seat 602 is relatively close to the guiding forming through die 8 to form a relative type through structure. The present application adopts a movable die instead of a conventional fixed die, so that the aluminum alloy thin-walled pipe cold-drawing forming reducing device synchronously forms a third type of force for processing the aluminum alloy pipe during the above-mentioned front-pulling and rear-pushing movement, thereby optimizing the greatly increased pushing and pulling force caused by the step-by-step cold-drawing forming, and improving the processing efficiency and stability.

[0044] In the embodiment of the present application, the tensioning drive assembly 3 drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall maintaining forming auxiliary shaft core 11, the connecting pulling shaft 12 and the pushing shaft rod 13 synchronously push the aluminum alloy pipe raw material through the gradually decreasing drawing through the forming cavity, and the formed end of the aluminum alloy thin-walled pipe is limited from advancing after contacting the limiting die 10. The chain belt A continuously drives the inner wall maintaining forming auxiliary shaft core 11 to form an inner wall correction structure through the inner wall of the aluminum alloy thin-walled pipe under the differential transmission drive of the tensioning drive assembly 3. The present application drives the tensioning drive assembly 3 in a single movement state, and controls the movement distance reasonably, so that the aluminum alloy thin-walled pipe cold-drawing forming reducing device forms a sequential movement of external shaping and inner wall auxiliary correction while maintaining the overall integrity of the pipe, thereby effectively improving the functionality of the cold-drawing forming reducing device.

[0045] Embodiment 2 provides an aluminum alloy thin-walled pipe cold-drawing forming reducing device, comprising the following steps:

[0046] S100, pretreatment: first, adjust the levelness of the driving guide rail 6 by controlling the suspension frame 5, ensure the forming machine body 1 in stable working condition; the aluminum alloy wall pipe raw material is sent into the entrance end of the guide forming through the mold 8, the inner diameter of the mold is slightly larger than the outer diameter of the pipe, which plays a preliminary guiding role;

[0047] S200, basic drawing treatment: the differential mechanism driven by the hydraulic motor makes the chain belt A and the chain belt B move synchronously, the chain belt B drives the connecting drawing shaft 12 from the front end and the pushing shaft 13 from the rear end to pull and push the pipe; at the same time, the chain belt A pulls the inner wall maintaining forming auxiliary shaft core 11 from the front end to draw the pipe, forming the resultant force of front pulling and rear pushing;

[0048] S300, two-stage extrusion processing: the movable end of the stroke control hydraulic cylinder 609 pushes any one of the sliding connecting seats 602 to move along the driving guide rail 6; through the folding action of the shear link mechanism 7, all the decreasing molds 9 on the sliding connecting seats 602 are close to the guide forming through the mold 8 side, forming a radial compression force;

[0049] S400, correction processing: when the front end of the pipe reaches the limiting mold 10 at the bottom of the force receiving seat 603, the pipe is forced to stop because the inner diameter of the limiting mold is smaller than the outer diameter of the pipe; at this time, the differential drive mechanism switches mode: the chain belt B is paused, the chain belt A is moved to push, and the inner wall maintaining forming auxiliary shaft core 11 continues to move forward inside the static pipe.

[0050] The embodiments of the present application are disclosed, but not limited to, the ordinary skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

Claims

1. An apparatus for cold-drawing and reducing the diameter of thin-walled aluminum alloy pipe, characterized by comprising: Including the forming machine body (1), the auxiliary drive rail frame (2) is arranged on the forming machine body (1), the tensioning drive assembly (3) is arranged at both ends of the auxiliary drive rail frame (2), the tensioning drive assembly (3) is drivenly connected by chain belt A and chain belt B; The control suspension frame (5) is arranged at both sides of the top of the forming machine body (1), the drive guide rail (6) is arranged between the two control suspension frames (5), and a plurality of fixed forming connecting seats (601), a plurality of sliding connecting seats (602) and a stress receiving seat (603) are arranged on the drive guide rail (6); Wherein, the auxiliary drive rail frame (2) is further provided with a stroke control hydraulic cylinder (609) through a fixing seat; the movable end of the stroke control hydraulic cylinder (609) is connected with any one of the sliding connecting seats (602); And, the drive guide rail (6) is provided with a scissor linkage mechanism (7) at the bottom, the folding fixed end of the scissor linkage mechanism (7) is arranged on any one of the fixed forming connecting seats (601), and the sliding connecting seats (602) are sequentially arranged at the other end of the scissor linkage mechanism (7); A plurality of the fixed forming connecting seats (601) are connected through the guide forming through die (8), a plurality of the sliding connecting seats (602) are provided with a decreasing die (9) at the bottom, and the stress receiving seat (603) is provided with a limiting die (10) at the bottom; The guide forming through die (8), the decreasing die (9) and the limiting die (10) form a decreasing drawing through forming cavity in the axial inner wall gap; An inner wall maintaining forming auxiliary shaft core (11) is arranged in the decreasing drawing through forming cavity, and the end of the inner wall maintaining forming auxiliary shaft core (11) is fixedly connected with the chain belt A through a connecting seat A; A connecting pulling shaft (12) is arranged in the inner wall maintaining forming auxiliary shaft core (11), and the end of the connecting pulling shaft (12) is fixedly connected with the chain belt B through a connecting seat B; And, a push driving shaft rod (13) is threadedly connected to the other end of the connecting pulling shaft (12), and the end of the push driving shaft rod (13) is fixedly connected with the chain belt B through a connecting seat C.

2. The apparatus for reducing the diameter of an aluminum alloy thin-walled pipe by cold-drawing forming according to claim 1, wherein The tensioning drive assembly (3) comprises a drive shaft (301) arranged on both sides of the auxiliary drive rail frame (2) through a bearing, and a drive sprocket (302) for drivingly connecting the chain belt A and the chain belt B is arranged on the drive shaft (301); Wherein, a differential drive mechanism is arranged between the two drive sprockets (302) on at least one side. The differential drive mechanism comprises a driving seat (303) fixed on the forming machine body (1); the driving seat (303) is provided with a driving gear disc (304) rotatingly; the end of the driving gear disc (304) is provided with a connecting hinge seat (3041); the connecting hinge seat (3041) is provided with a central meshing driving gear (305); the driving gear disc (304) is provided with a synchronous meshing driving gear (306) axially on the opposite surface of the two driving chain wheels (302); the synchronous meshing driving gear (306) is fixedly connected with the driving chain wheel (302), and the central meshing driving gear (305) is meshingly connected with the synchronous meshing driving gear (306); Wherein, the driving gear disc (304) is driven by the hydraulic motor driving device arranged on the lower side of the forming machine body (1).

3. The apparatus according to claim 2, wherein The guide forming through die (8) is a hollow structure, and the inner wall diameter of the guide forming through die (8) is greater than or equal to the outer wall diameter of the aluminum alloy pipe raw material, and the guide forming through die (8) is a long shaft structure, and the aluminum alloy pipe raw material passes through while maintaining the levelness.

4. The apparatus according to claim 3, wherein The number of the tapering dies (9) is at least two; the inner wall opening end of the tapering die (9) close to the guide forming through die (8) has the same inner wall diameter as the guide forming through die (8); and the inner wall forming channels of the two connected tapering dies (9) are tapering.

5. The apparatus for reducing the diameter of an aluminum alloy thin-walled pipe by cold-drawing forming according to claim 4, wherein The inner wall diameter of the limiting die (10) is smaller than the outer wall diameter of the aluminum alloy thin-walled pipe, so that the forming end of the aluminum alloy thin-walled pipe is limited from advancing after contacting the limiting die (10).

6. An apparatus for reducing the diameter of an aluminum alloy thin-walled tube by cold-drawing forming according to claim 5, wherein The tensioning drive assembly (3) drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall maintaining forming auxiliary shaft core (11), the connecting pulling shaft (12) and the push driving shaft rod (13) synchronously push the aluminum alloy pipe raw material through the tapering drawing through the forming cavity, forming a front-pulling and rear-pushing maintaining type forming structure for the aluminum alloy thin-walled pipe.

7. The apparatus according to claim 6, wherein The stroke control hydraulic cylinder (609) stroke movement drives the tapering die (9), and under the folding drive of the scissor linkage mechanism (7), the sliding connecting seat (602) relatively close to the guide forming through die (8) forms a relative passing structure.

8. The apparatus according to claim 7, wherein The tensioning drive assembly (3) drives the chain belts A and B to drive the connecting seats A, B and C, so that the inner wall maintaining forming auxiliary shaft core (11), the connecting pulling shaft (12) and the push driving shaft rod (13) synchronously push the aluminum alloy pipe raw material through the tapering drawing through the forming cavity, and the forming end of the aluminum alloy thin-walled pipe is limited from advancing after contacting the limiting die (10), and the chain belt A continuously drives the inner wall maintaining forming auxiliary shaft core (11) to form an inner wall correction structure through the inner wall of the aluminum alloy thin-walled pipe under the differential transmission drive of the tensioning drive assembly (3).

9. A method of using an apparatus for cold-drawing and reducing the diameter of thin-walled aluminum alloy tubing, said apparatus being as defined in claim 8, wherein, The method comprises the following steps: S100, pretreatment: first by controlling the suspension frame (5) adjustment drive rail (6) level, to ensure that the forming machine body (1) in stable working condition; aluminum alloy wall pipe material from the guide forming through the mold (8) from the inlet end into; S200, basic drawing process: hydraulic motor driven differential mechanism, chain A and chain B synchronous motion, chain B through the connecting seat B and connecting seat C driven connection pull shaft (12) from the front end of the push shaft (13) from the rear end of the pipe; at the same time, chain A traction inner wall keep forming auxiliary shaft core (11) from the front end of the pipe drawing, forming the resultant force of the front pull back push; S300, two extrusion through the process: stroke control hydraulic cylinder (609) moving end push any one of the sliding connection seat (602) along the drive rail (6) movement; through the folding action of the shear link mechanism (7), all the sliding connection seat (602) on the decreasing mold (9) to the guide forming through the mold (8) side together, forming a radial compression force; S400, correction process: when the pipe front end reaches the force bearing seat (603) bottom limit mold (10), because the limit mold inner diameter is less than the outer diameter of the pipe, the pipe is forced to stop; at this time the differential drive mechanism switching mode: chain B pause, chain A movement push, drive inner wall keep forming auxiliary shaft core (11) in the static pipe inside continue to move forward.

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