Double-machine-body hydraulic machine for forming end part of long pipe

Abstract

The invention provides a long pipe end forming double-machine-body hydraulic machine which comprises a pier forging female die which comprises a columnar die cavity and is divided into a fixed female die body and a movable female die body along a virtual plane passing through the axis of the die cavity, and the movable female die body can move in the direction perpendicular to the axis of the pier forging female die body; the upsetting male die and the upsetting female die are coaxially arranged in a matched mode, and the upsetting male die is arranged at the first end of the upsetting male die in the axial direction in a guiding mode; the push rod and the upsetting male die are coaxially arranged; when a pipe is formed through the device, the inner supporting die can stretch into the pipe and provide supporting force, the problem that a thin-wall or low-rigidity pipe is prone to compression instability and deformation due to the fact that an existing device only relies on external pressure is effectively solved, and through the internal and external dual effects, the pipe is not prone to deformation. And meanwhile, dependence on large-tonnage equipment is not needed, the energy consumption and the manufacturing cost of the equipment are reduced, and the production profit of an enterprise is increased.

Description

Technical Field

[0001] This invention relates to the field of forging equipment technology, and in particular to a double-body hydraulic press for forming the end of a long tube. Background Technology

[0002] In the fields of petroleum, chemical, and marine hydraulic systems, a large number of pipelines are required. These pipelines are generally constructed by connecting pipes of different lengths or diameters. Pipe installation and connection typically involves forming the pipe ends before connection. Existing straight pipe forming machines usually use a punch, driven by a hydraulic cylinder, to form one end of the pipe, deforming it into the required shape and size for connection with other pipes or flanges. However, in operation, existing pipe forming machines rely on a push rod to limit the pipe at one end while the punch applies pressure at the other. This results in uneven wall thinning and variations in pipe diameter. When the pipe wall is thin or lacks rigidity, the pipe is prone to compression instability and deformation under pressure, failing to form properly and affecting the quality of the pipe ends. Furthermore, existing forming machines rely solely on external pressure, resulting in large tonnage equipment, high energy consumption, high cost, and low production profits for companies, making them undesirable. Large-scale automated flaring machines are generally more expensive due to their complex design, which integrates knowledge from disciplines such as mechanics, electrical engineering, and microelectronics. Compared with traditional pipe flaring equipment, their periodic operating costs and maintenance costs are also higher, making it more desirable for companies to reduce these costs.

[0003] Most existing pipe end forming dies use partial rolling forming, which is inefficient and prone to wrinkling when compressing thin-walled pipes. The pipe diameter and center position can also change, increasing the difficulty of subsequent installation. Existing integral end flaring dies use flaring blocks on the die for flaring, but the diameter of these blocks is fixed. When different pipe diameters are needed, different flaring dies must be used, which is inconvenient, time-consuming, and labor-intensive. Furthermore, after flaring, the pipe needs to be removed from the die and cooled using a cooling device to solidify, a cumbersome process that wastes production time. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems by providing a double-body hydraulic press for forming the end of a long tube.

[0005] To achieve the above objectives, the technical solution of the present invention is: a double-body hydraulic press for forming the end of a long tube, comprising: The forging die includes a cylindrical cavity. Along a virtual plane passing through the axis of the cavity, the forging die is divided into a fixed die and a movable die. The movable die can move in a direction perpendicular to the axis of the forging die. The forging punch is coaxially adapted to the forging die and is axially guided at the first end of the forging punch; The push rod is coaxially arranged with the forging punch. The internal support mold is coaxially located at the end of the push rod near the forging die.

[0006] Furthermore, it also includes horizontal rear longitudinal beams and horizontal front longitudinal beams arranged at intervals, with the forging die horizontally arranged on the horizontal front longitudinal beam; a horizontal drive cylinder is horizontally arranged on the horizontal rear longitudinal beam, and the forging punch is arranged at the end of the horizontal drive cylinder.

[0007] Furthermore, an inner support drive cylinder is horizontally arranged on the horizontal rear longitudinal beam, the push rod is the piston rod of the inner support drive cylinder, and the forging die is guided and matched with the push rod.

[0008] Furthermore, the inner support mold includes an inner core of the inner support mold that is slidably sleeved on the end of the push rod, and a plurality of outer cores of the inner support mold that are evenly spaced around the outer circumferential surface of the inner core of the inner support mold. A core rod is coaxially arranged inside the push rod, and a second plate is connected to the end of the core rod that extends out of the push rod. The second plate abuts against the end of the inner core of the inner support mold. The plurality of outer cores of the inner support mold are limited to the push rod. The outer circumferential surface of the inner core of the inner support mold is a conical surface.

[0009] Furthermore, on the side of the inner support mold near the horizontal rear longitudinal beam, a first plate is fitted on the push rod, and the side of the first plate opposite to the inner support mold is matched with the push rod for limiting.

[0010] Furthermore, the outer peripheral surface of the inner core of the inner support mold is provided with dovetail plates that correspond one-to-one with the outer cores of the multiple inner support molds, and the outer core of the inner support mold is provided with dovetail grooves that cooperate with the dovetail plates.

[0011] Furthermore, a core rod drive cylinder is coaxially mounted on one end of the inner support drive cylinder away from the horizontal front longitudinal beam, and the other end of the core rod passes through the inner support drive cylinder and is connected to the core rod drive cylinder.

[0012] Furthermore, the horizontal front longitudinal beam is equipped with a vertical lower crossbeam, the fixed die is disposed on the horizontal front longitudinal beam, a vertical moving beam is vertically movable above the horizontal front longitudinal beam, and the movable die is disposed on the lower surface of the vertical moving beam.

[0013] Furthermore, vertical guide posts are provided at the four corners of the lower vertical beam, and vertical clamping cylinders are provided at the top of the vertical guide posts. The vertical moving beam is located at the end of the vertical clamping cylinders.

[0014] Furthermore, the horizontal rear longitudinal beam and the horizontal front longitudinal beam are connected by horizontal guide posts.

[0015] This invention discloses a dual-body hydraulic press for long pipe end forming, which has the following advantages compared with existing technologies: The forging punch and forging die are coaxially adapted and axially guided at their first end. This coaxial guiding structure ensures that the punch always moves along a predetermined axis during pressure application, avoiding uneven stress on the pipe due to punch misalignment, thereby reducing uneven pipe wall thinning and pipe diameter changes. The push rod is coaxially arranged with the forging punch, providing an installation foundation and motion guide for the inner support mold, ensuring that the inner support mold can accurately extend into the pipe. The inner support mold is coaxially arranged at the end of the push rod near the forging die. During pipe forming, the inner support mold can extend into the pipe and provide support force, effectively solving the problem that existing equipment relies solely on external pressure, leading to easy compression instability and deformation of thin-walled or low-rigidity pipes. Through the dual action of internal and external pressure, the forming quality of the pipe end is guaranteed, while eliminating the need for large-tonnage equipment, reducing equipment energy consumption and cost, and increasing enterprise production profits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0017] Figure 2 This is a side view of a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0018] Figure 3 This is a top view schematic diagram of a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0019] Figure 4 for Figure 2 The diagram shows a cross-sectional view of a double-body hydraulic press for forming the end of a long tube according to the present invention at point AA.

[0020] Figure 5 for Figure 3 The diagram shows a cross-sectional view of the dual-body hydraulic press for forming the end of a long tube at point BB.

[0021] Figure 6 for Figure 5 The diagram shows a partially enlarged structural schematic of point C in a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0022] Figure 7 This is a schematic diagram of the cross-sectional structure of the inner support mold in a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0023] Figure 8 This is a schematic diagram of the internal support mold in a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0024] Figure 9This is a schematic diagram of the end face structure of the inner support mold in a double-body hydraulic press for forming the end of a long tube according to the present invention.

[0025] In the diagram: 1. Horizontal rear longitudinal beam; 2. Horizontal guide post; 3. Upsetting punch; 4. Moving die; 5. Vertical clamping cylinder; 6. Vertical guide post; 7. Vertical moving beam; 8. Fixed die; 80. Groove; 81. Clamping section; 9. Long tube blank; 10. Horizontal front longitudinal beam; 11. Vertical lower crossbeam; 12. Horizontal moving beam; 13. Vertical upper crossbeam; 15. Core rod drive cylinder; 150. Core rod; 151. Nut; 16. Inner support drive cylinder; 160. Push rod; 17. Horizontal drive cylinder; 18. Inner support mold; 180. Inner core of inner support mold; 181. First plate; 182. Second plate; 183. Outer core of inner support mold; 1830. Second dovetail groove; 184. Dovetail plate. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0027] Please refer to Figure 1-9 This invention provides a double-body hydraulic press for forming the end of a long tube. As a specific embodiment, it includes: The forging die includes a columnar cavity. Along a virtual plane passing through the axis of the cavity, the forging die is divided into a fixed die 8 and a movable die 4. The movable die 4 can move in a direction perpendicular to the axis of the forging die. The forging punch is coaxially adapted to the forging die and is axially guided at the first end of the forging punch; The push rod is 160mm and is coaxially arranged with the forging punch. The inner support mold 18 is coaxially mounted on the end of the push rod 160 near the forging die.

[0028] For details, please refer to Figure 1 - Figure 9 As a specific embodiment, a double-body hydraulic press for forming the end of a long pipe includes: an upsetting die and an upsetting punch arranged at intervals along the horizontal direction. The upsetting die includes a fixed die 8 and a movable die 4, which are evenly divided. The fixed die 8 is located below the movable die 4. The upsetting punch is movable in the horizontal direction and is provided with an inner support mold 18. The inner support mold 18 is located at the end of a push rod 160, which is movable in directions approaching and away from the upsetting die. In the initial state, it can pull the inner support mold 18 out of the upsetting die. With the above arrangement, refer to... Figure 6The forging die includes a columnar clamping section 81 and a groove 80 coaxially disposed at the end of the clamping section 81. During operation, the long tube blank 9 to be forged can be placed in the forging die. The moving die 4 moves down and merges with the fixed die 8, and the outer circumferential surface of the tube blank is clamped by the clamping section 81. Then, the push rod 160 moves to drive the inner support die 18 to extend into the long tube blank 9 and expand inward to support the inner circumferential surface of the long tube blank 9. Thus, the long tube blank 9 is clamped by the clamping section 81 and the inner support die 18. Then, the forging punch is driven to move towards the forging die to forge the end of the long tube blank 9 that extends into the groove 80, thereby achieving the forming purpose. After forming, the inner support die 18 retracts and is pulled out, and the moving die 4 moves up to remove the long tube blank 9. This design breaks the structural limitations of the traditional integral die. When the tube is installed and removed, the opening and closing of the die cavity can be achieved by moving the moving die 4, which facilitates the quick positioning and unloading of the tube and avoids the problem of low production efficiency caused by the inconvenience of opening and closing of traditional dies. The forging punch and die are coaxially fitted and axially guided at their first end. This coaxial guiding structure ensures that the punch always moves along a predetermined axis during pressure application, avoiding uneven stress on the pipe due to punch misalignment, thereby reducing uneven pipe wall thinning and pipe diameter changes. The push rod 160 is coaxially arranged with the forging punch, providing an installation foundation and motion guide for the inner support mold 18, ensuring that the inner support mold 18 can accurately extend into the pipe. The inner support mold 18 is coaxially located at the end of the push rod 160 near the forging die. During pipe forming, the inner support mold 18 can extend into the pipe and provide support force, effectively solving the problem of thin-walled or low-rigidity pipes easily compressing and deforming due to external pressure alone in existing equipment. Through this dual internal and external action, the forming quality of the pipe ends is guaranteed, while eliminating the need for large-tonnage equipment, reducing equipment energy consumption and cost, and increasing enterprise production profits.

[0029] Furthermore, as a specific implementation method, refer to Figure 1 - Figure 3The present invention provides a double-body hydraulic press for forming the end of a long tube, which further includes a horizontally spaced rear longitudinal beam 1 and a horizontally spaced front longitudinal beam 10. The forging die is horizontally mounted on the horizontally front longitudinal beam 10. A horizontally driven cylinder 17 is horizontally mounted on the horizontally rear longitudinal beam 1, and the forging punch is mounted at the end of the horizontally driven cylinder 17. Specifically, there are two horizontally driven cylinders 17, which are horizontally positioned on both sides of the forging punch. The double-body structure is formed by the spaced-out horizontally spaced rear longitudinal beam 1 and horizontally spaced front longitudinal beam 10. The horizontally positioned forging die and forging punch facilitate the loading and unloading of the long tube blank 9 and makes inspection and processing easier. Compared with the traditional single-body structure, the double-body frame can more stably bear the movement and stress of each component, reduce vibration during operation, and improve overall operational stability. The forging die is set horizontally, and the fixed die 8 is installed on the horizontal front longitudinal beam 10 to fix the position of the die and provide a stable forming reference for the pipe. The horizontal drive cylinder 17 is set horizontally on the horizontal rear longitudinal beam 1, and the forging punch is installed at its end. The horizontal drive cylinder 17 can provide a stable and controllable axial driving force for the forging punch. Compared with the traditional hydraulic cylinder drive, the driving force adjustment is more precise.

[0030] Furthermore, as a preferred embodiment, the horizontal rear longitudinal beam 1 and the horizontal front longitudinal beam 10 are connected by horizontal guide posts 2, wherein four horizontal guide posts 2 are provided, and the four horizontal guide posts 2 are respectively located at the four corners of the horizontal rear longitudinal beam 1. The push rod 160 is located at the center of the horizontal rear longitudinal beam 1. A horizontal moving beam 12 is guided and fitted on the four horizontal guide posts, and the forging punch is located on the horizontal moving beam 12.

[0031] Furthermore, as a specific implementation method, refer to Figure 1 - Figure 5An internal support drive cylinder 16 is horizontally mounted on the horizontal rear longitudinal beam 1, and a push rod 160 serves as the piston rod of the internal support drive cylinder 16. The forging die is guided and engaged with the push rod 160. Specifically, an internal support drive cylinder 16 is added to the horizontal rear longitudinal beam 1, and the push rod 160 is designed as the piston rod of the internal support drive cylinder 16, while the forging die is guided and engaged with the push rod 160. The configuration of the internal support drive cylinder 16 provides an independent and controllable driving force for the movement of the push rod 160, realizing independent movement control of the push rod 160 and the forging punch. That is, the pressing action of the forging punch and the extension and retraction action of the internal support mold 18 driven by the push rod 160 can be adjusted separately. The movement sequence of each component can be flexibly adjusted according to different stages of pipe forming (such as the extension of the internal support mold 18, the pressing and forming of the punch, the retraction of the internal support mold 18, and the resetting of the punch), thereby improving the coordination and accuracy of the forming process. The guiding fit between the forging die and the push rod 160 further ensures that the push rod 160 always moves along the axial direction when it drives the inner support die 18, avoiding the inner support die 18 from shifting and causing uneven support inside the pipe, thereby ensuring the forming quality of the pipe. At the same time, this structural design simplifies the installation and positioning of the push rod 160, reduces the fit error between components, and reduces the difficulty and cost of equipment manufacturing.

[0032] Furthermore, as a specific implementation method, refer to Figure 4 , Figure 5 The inner support mold 18 includes an inner core of the inner support mold 18 that is slidably sleeved on the end of the push rod 160, and a plurality of outer cores of the inner support mold 18 that are evenly spaced around the outer circumferential surface of the inner core of the inner support mold 18. A core rod 150 is coaxially arranged inside the push rod 160. The end of the core rod 150 that extends out of the push rod 160 is connected to a second plate 182, which is limited by a nut 151. The second plate 182 abuts against the end of the inner core of the inner support mold 18. The plurality of outer cores of the inner support mold 18 are limited to the push rod 160. The outer circumferential surface of the inner core of the inner support mold 18 is a conical surface.

[0033] Specifically, the working principle of the inner support mold 18 is as follows: the position of the inner support mold 18 is adjusted by moving the push rod 160. After moving to the predetermined position, the second plate 182 is moved by the axial movement of the core rod 150, causing the inner core of the inner support mold 18 to move closer to the push rod 160. At this time, the outer core of the inner support mold 18 is axially limited and will not move. Therefore, the outer core and the inner core move relative to each other. The conical surface of the inner core of the inner support mold 18 pushes the outer core outward, thereby achieving an expansion effect, so that the outer core of the inner support mold 18 abuts against the inner circumferential surface of the tube blank, achieving the inner support effect. This adjustable outer diameter inner support mold 18 structure solves the problem of the fixed diameter of the flaring block of the existing flaring mold, which requires frequent mold replacement to adapt to different diameter pipes. The outer diameter of the inner support mold 18 can be changed simply by adjusting the movement of the core rod 150, adapting to the forming needs of different pipe diameters, saving mold replacement time and costs, and improving production efficiency. Meanwhile, the evenly spaced outer cores provide uniform support for the inside of the pipe, avoiding wrinkling and diameter changes caused by uneven local stress, ensuring the stability of the pipe's center position, and reducing the difficulty of subsequent installation.

[0034] Specifically, in practical applications, the inner support mold 18 consists of twelve outer cores and one solid inner core. The twelve outer cores are evenly distributed around the outer side of the inner core in the circumferential direction at a subtended central angle of 30 degrees. The twelve outer cores are connected to the inner core in the axial direction using oblique dovetail grooves. The inner support mechanism provides frictional force to both the inner and outer walls of the pipe fitting simultaneously, reducing the clamping force required on the vertical machine body and effectively reducing the weight and energy consumption of the equipment. For large-diameter thin-walled pipe fittings, the inner support mechanism prevents the difficulty of end forming due to outer wall clamping instability. Furthermore, without changing the mold, by varying the contact area of ​​the outer and inner core wedges, a series of pipe end formings with different inner diameters can be achieved, saving production time and improving production efficiency.

[0035] Preferred, Reference Figure 9 The outer core of the inner support mold 18 is provided with an inclined surface that matches the conical surface of the inner core of the inner support mold 18.

[0036] Furthermore, as a preferred embodiment, refer to Figure 4 - Figure 6 , Figure 8Located on the side of the inner support mold 18 near the horizontal rear longitudinal beam 1, a first plate 181 is fitted onto the push rod 160. The side of the first plate 181 opposite to the inner support mold 18 is matched with the push rod 160 for limiting. Specifically, the end of the push rod 160 is provided with a stepped portion. The first rod is an annular plate fitted onto the end of the push rod 160, which abuts against the stepped portion for limiting. Then, the inner core of the inner support mold 18 is fitted onto it. The first plate 181 can enhance the structural strength of the connection between the push rod 160 and the inner support mold 18, reduce wear or damage caused by stress concentration in this part, extend the service life of the equipment, and reduce maintenance costs.

[0037] Furthermore, as a preferred embodiment, refer to Figure 7 - Figure 9 The outer circumferential surface of the inner core of the inner support mold 18 is provided with dovetail plates 184 corresponding one-to-one with the outer cores of the multiple inner support molds 18. The outer cores of the inner support mold 18 are provided with dovetail grooves that mate with the dovetail grooves. Specifically, compared with the traditional planar fit or the convex-groove fit 80, the dovetail structure has better guidance and stability, ensuring that the contact between the conical surface of the inner core and the outer core remains precise during the sliding process, avoiding the outer core from shifting or tilting during radial movement, thereby ensuring the uniformity and accuracy of the outer diameter adjustment of the inner support mold 18. At the same time, the dovetail fit ensures that the connection between the outer core and the inner core of the inner support mold 18 will not separate, ensuring the integrity of the inner support mold 18. When changing the long tube blank 9, it ensures that the outer core of the inner support mold 18 will not separate from the inner core.

[0038] As a preferred embodiment, refer to Figure 8 The inner core of the inner support mold 18 can be connected to the second plate by screws or the like. With this arrangement, when the inner support mold 18 is reduced in diameter, the second plate 182 is pushed by the core rod 150. At this time, the second plate 182 drives the inner core of the inner support mold 18 to move. At this time, the outer core 183 of the inner support mold moves relative to the inner core 180 of the inner support mold under the action of friction with the long tube blank 9, thereby realizing the reduction in diameter. The above method is more conducive to the reduction of the diameter of the inner support mold 18.

[0039] Furthermore, a core rod drive cylinder 15 is coaxially mounted on one end of the inner support drive cylinder 16 away from the horizontal front longitudinal beam 10, and the other end of the core rod 150 passes through the inner support drive cylinder 16 and connects to the core rod drive cylinder 15. Specifically, refer to... Figure 1 - Figure 8In a preferred embodiment, the mandrel drive cylinder 15 is located at the end of the inner support drive cylinder 16. The independent configuration of the mandrel drive cylinder 15 enables independent control of the movement of the mandrel 150. It controls the movement of the push rod 160 and the mandrel 150 separately from the inner support drive cylinder 16, allowing the "insertion / exit" and "outer diameter expansion / contraction" actions of the inner support mold 18 to be adjusted completely independently. For example, before pipe forming, the inner support drive cylinder 16 can push the push rod 160 to insert the inner support mold 18 into the pipe, and then the mandrel drive cylinder 15 can drive the mandrel 150 to expand the outer diameter of the inner support mold 18 until it fits against the inner wall of the pipe. After forming, the mandrel drive cylinder 15 drives the mandrel 150 to contract the outer diameter of the inner support mold 18, and then the inner support drive cylinder 16 pulls the push rod 160 to withdraw the inner support mold 18 from the pipe. This independent control method further enhances the flexibility and precision of the molding process, adapting to the support requirements of pipes with different wall thicknesses and materials. It avoids problems of insufficient or excessive support caused by linkage of actions, while simplifying the control logic, reducing the difficulty of equipment operation, and the overall structure of the above-mentioned coordination is compact and reasonable.

[0040] Furthermore, as a specific implementation, the horizontal front longitudinal beam 10 is equipped with a vertical lower crossbeam 11, the fixed die 8 is disposed on the horizontal front longitudinal beam 10, a vertical moving beam 7 is vertically movable above the horizontal front longitudinal beam 10, and the movable die 4 is disposed on the lower surface of the vertical moving beam 7. Specifically, the horizontal front longitudinal beam 10 is equipped with a vertical lower crossbeam 11, the fixed die 8 is disposed on the horizontal front longitudinal beam 10, the vertical moving beam 7 is vertically movable above the horizontal front longitudinal beam 10, and the movable die 4 is disposed on the lower surface of the vertical moving beam 7. The vertical lower crossbeam 11 provides a stable support foundation for the horizontal front longitudinal beam 10, enhances the structural stability of the die mounting area, and prevents deformation of the horizontal front longitudinal beam 10 due to force on the die during the molding process. The vertical movement design of the vertical moving beam 7 allows the opening and closing action of the movable die 4 to be achieved through vertical movement. Compared with horizontal opening and closing, vertical opening and closing is more convenient for loading and unloading pipes, and can be used with automated loading equipment to achieve rapid positioning of pipes, further improving production efficiency. Meanwhile, the vertical opening and closing method ensures that the moving die 4 and the fixed die 8 fit tightly when closed, avoiding gaps that could cause flash or dimensional deviations during pipe forming, thus ensuring forming quality. In addition, this structure also makes it easy to adjust the fitting gap between the moving die 4 and the fixed die 8 to adapt to the forming requirements of pipes with different wall thicknesses.

[0041] In a specific implementation, the upper surface of the movable die 4 can be connected to the vertical moving beam 7 through a dovetail groove with horizontal insertion, and the lower surface of the fixed die 8 can also be connected to the vertical lower crossbeam 11 through a dovetail groove with horizontal insertion. This connection method can transfer the load of the vertical clamping cylinder 5 to the upsetting upper and lower dies, causing the billet to be clamped, thus avoiding the transfer of the horizontal load to the vertical frame and affecting its service performance.

[0042] Furthermore, as a specific implementation, vertical guide posts 6 are provided at the four corners of the lower vertical beam 11, a vertical upper beam 13 is provided at the top of the vertical guide posts 6, a vertical clamping cylinder 5 is provided on the upper vertical beam 13, and a vertical moving beam 7 is provided at the end of the vertical clamping cylinder 5.

[0043] The working principle of the double-body hydraulic press for forming the end of a long tube according to the present invention is as follows: Step 1: During operation, firstly, based on the diameter and wall thickness of the pipe to be formed, adjust the initial outer diameter of the inner support mold 18 using the core rod drive cylinder 15, ensuring that the outer diameter of the inner support mold 18 is slightly smaller than the inner diameter of the pipe, so that it can smoothly extend into the pipe. Then, control the vertical clamping cylinder 5 to drive the vertical moving beam 7 upward, separating the moving die 4 from the fixed die 8, and placing the pipe to be formed horizontally within the cavity of the fixed die 8, ensuring that the pipe axis coincides with the forging die axis. Next, the vertical clamping cylinder 5 drives the vertical moving beam 7 downward, closing the moving die 4 and the fixed die 8, thus positioning and clamping the outside of the pipe. Step 2: The inner support drive cylinder 16 is activated, pushing the push rod 160, which serves as its piston rod, to move axially, causing the inner support mold 18 to extend into the end of the pipe near the forging die. During this process, the core rod 150 drive rod extends synchronously. When the inner support mold 18 reaches the preset support position, the inner support drive cylinder 16 stops moving. At this time, the core rod drive cylinder 15 is activated, driving the core rod 150 to move axially away from the forging die. The second plate 182 at the end of the core rod 150 pushes the inner core 180 of the inner support mold to slide along the push rod 160. Since the outer circumferential surface of the inner core is conical, during the sliding process, the conical surface pushes multiple outer cores 183 of the inner support mold to expand radially outward until the outer circumferential surface of the outer core is tightly fitted with the inner wall of the pipe, providing stable support for the inside of the pipe. The core rod drive cylinder 15 maintains pressure, keeping the inner support mold 18 in a supported state. Step 3: The horizontal drive cylinder 17 is activated, pushing the forging punch axially towards the forging die. The forging punch gradually extends into the die cavity, applying axial pressure to the pipe end. Under the combined action of external pressure from the forging punch and internal support from the inner support mold 18, the pipe end gradually deforms, conforming to the shape of the forging die cavity, thus achieving end forming. During the forming process, the pressure of the horizontal drive cylinder 17 can be adjusted in real time according to the pipe forming requirements to ensure forming quality. Step 4: After the pipe end is formed, the horizontal drive cylinder 17 first drives the forging punch to move axially away from the forging die until it resets. Next, the mandrel drive cylinder 15 drives the mandrel 150 to move axially towards the forging die, and the inner core 180 of the inner support mold resets under the action of the mandrel 150, eliminating the radial thrust of the inner core on the multiple outer cores. Subsequently, the inner support drive cylinder 16 drives the push rod 160 and the inner support mold 18 to move axially away from the forging die, pulling the inner support mold 18 out of the pipe and resetting it.

[0044] Step 5: The vertical clamping cylinder 5 drives the vertical moving beam 7 to move upward, causing the moving die 4 to separate from the fixed die 8. The operator or automated equipment then removes the formed pipe from the fixed die 8, completing one pipe end forming operation.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A double-body hydraulic press for forming the ends of long tubes, characterized in that, include: The forging die includes a columnar cavity. Along a virtual plane passing through the axis of the cavity, the forging die is divided into a fixed die (8) and a movable die (4). The movable die (4) can move in a direction perpendicular to the axis of the forging die. The forging punch is coaxially fitted with the forging die and is axially guided on one side of the forging die. The push rod (160) is coaxially arranged with the forging punch; The inner support mold is coaxially located at one end of the push rod (160) near the forging die.

2. The double-body hydraulic press for forming the end of a long tube according to claim 1, characterized in that, It also includes a horizontal rear longitudinal beam (1) and a horizontal front longitudinal beam (10) arranged at intervals, and the forging die is horizontally arranged on the horizontal front longitudinal beam (10); a horizontal drive cylinder (17) is horizontally arranged on the horizontal rear longitudinal beam (1), and the forging punch is arranged at the end of the horizontal drive cylinder (17).

3. A double-body hydraulic press for forming the end of a long tube according to claim 2, characterized in that, An internal support drive cylinder (16) is horizontally arranged on the horizontal rear longitudinal beam (1), and the push rod (160) is the piston rod of the internal support drive cylinder (16). The forging die is guided and matched with the push rod (160).

4. A double-body hydraulic press for forming the end of a long tube according to claim 3, characterized in that, The inner support mold (18) includes an inner support mold core (180) slidably sleeved on the end of the push rod (160) and a plurality of inner support mold outer cores (183) evenly spaced around the outer circumferential surface of the inner support mold core (180). A core rod (150) is coaxially arranged inside the push rod (160). The end of the core rod (150) extending out of the push rod (160) is connected to a second plate (182). The second plate (182) abuts against the end of the inner support mold core (18). The plurality of inner support mold outer cores (183) are limited to the push rod (160). The outer circumferential surface of the inner support mold core (180) is a conical surface.

5. A double-body hydraulic press for forming the end of a long tube according to claim 4, characterized in that, Located on the side of the inner support mold (18) near the horizontal rear longitudinal beam (1), the push rod (160) is fitted with a first plate (181), and the side of the first plate (181) opposite to the inner support mold (18) is matched with the push rod (160) for limiting.

6. A double-body hydraulic press for forming the end of a long tube according to claim 5, characterized in that, The outer periphery of the inner core (180) of the inner support mold is provided with dovetail plates (184) that correspond one-to-one with the outer cores (183) of the multiple inner support molds, and the outer core of the inner support mold (18) is provided with dovetail grooves that cooperate with the dovetail plates (184).

7. A double-body hydraulic press for forming the end of a long tube according to any one of claims 4-6, characterized in that, The inner support drive cylinder (16) is coaxially provided with a core rod (150) drive cylinder (15) at one end away from the horizontal front longitudinal beam (10), and the other end of the core rod (150) passes through the inner support drive cylinder (16) and is connected to the core rod (150) drive cylinder (15).

8. A double-body hydraulic press for forming the end of a long tube according to claim 2, characterized in that, The horizontal front longitudinal beam (10) is equipped with a vertical lower crossbeam (11), the fixed die (8) is set on the horizontal front longitudinal beam (10), and a vertical moving beam (7) is vertically moved above the horizontal front longitudinal beam (10). The movable die (4) is set on the lower surface of the vertical moving beam (7).

9. A double-body hydraulic press for forming the end of a long tube according to claim 7, characterized in that, Vertical guide posts (6) are provided at the four corners of the vertical lower beam (11), and vertical clamping cylinders (5) are provided at the top of the vertical guide posts (6). The vertical moving beam (7) is located at the end of the vertical clamping cylinder (5).

10. A double-body hydraulic press for forming the end of a long tube according to claim 2, characterized in that, The horizontal rear longitudinal beam (1) and the horizontal front longitudinal beam (10) are connected by a horizontal guide post (2).

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