Pulling and jacking forming device and assembling method

Abstract

The invention discloses a top pulling forming device and an assembling method. The top pulling forming device comprises a workbench, a mold body, a movable platform, a push-bending assembly and a positioning assembly, and first grooves are formed in the workbench at intervals; the moving platform is slidably arranged in the first groove; the push-bending assembly comprises a top cylinder assembly, a pull cylinder assembly and a filling medium, the filling medium is arranged in the pipe blank, one end of the top cylinder assembly is arranged on the moving platform, the other end of the top cylinder assembly is configured to extend into one end of the pipe blank to extrude the filling medium, and the pull cylinder assembly is connected with the top cylinder assembly; the cylinder score assembly is configured to penetrate through the filling medium, abut against the other end of the pipe blank and drive the pipe blank to move along the forming cavity; the positioning assembly comprises a positioning rod and a positioning hole, the positioning rod is arranged on the top cylinder assembly, and the mold body is provided with the positioning hole. Therefore, the positioning and assembling difficulty between the push-bending assembly and the mold main body is reduced, the experiment early-stage efficiency is greatly improved, and the dependence on the manual proficiency degree is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of pipe bending forming, and particularly to a pulling forming device and assembly method. Background Technology

[0002] The push-bending forming technology for pipes is an integral forming technology for thin-walled pipes with small bending radii (i.e., thickness-to-diameter ratio t / D ≤ 0.05, relative bending radius r / D ≤ 1.5, where t is the pipe wall thickness, r is the bending radius, and D is the pipe outer diameter). Traditional push-bending forming methods require simultaneous positioning and assembly of the push head and push cylinder, as well as the flexible push rod and push cylinder. Because positioning and assembly must consider both simultaneously, assembly is difficult, accuracy is low, and efficiency is low. The positioning and assembly molds occupy a significant amount of experimental time, greatly extending the experimental cycle and requiring a high level of operator proficiency. Furthermore, when producing various specifications of bent pipes, frequent mold changes are necessary. The long time allotted for positioning and assembly molds in traditional push-bending forming methods hinders efficient production of multiple specifications of bent pipes. Therefore, a new, efficient, convenient, and safe pipe bending forming technology is urgently needed. Summary of the Invention

[0003] Therefore, in order to improve experimental efficiency and reduce the difficulty of positioning and assembly during the experiment, it is necessary to provide a pull-out forming device and assembly method to achieve efficient, convenient and safe tube bending forming.

[0004] A pull-out forming apparatus, comprising: The worktable has spaced-out first grooves; A mold body is disposed on the worktable, the mold body is spaced apart from the first groove, the mold body has a forming cavity, and the tube blank is disposed in the forming cavity; A mobile platform is slidably disposed within the first groove, and the mobile platform is capable of reciprocating along the first groove; The bending assembly includes a top cylinder assembly, a pull cylinder assembly, and a filling medium. The filling medium is disposed inside the tube blank. One end of the top cylinder assembly is disposed on the moving platform, and the other end of the top cylinder assembly is configured to extend into one end of the tube blank and squeeze the filling medium to generate internal pressure and act on the inside of the tube blank. The pull cylinder assembly is connected to the top cylinder assembly and is configured to pass through the filling medium and abut against the other end of the tube blank, and drive the tube blank to move along the forming cavity. The positioning component includes a positioning rod and a positioning hole. The positioning rod is disposed in the top cylinder component. The mold body has a positioning hole. The moving platform is used to drive the bending push component to move along the first groove so that the positioning rod is inserted into the positioning hole, thereby realizing the positioning of the bending push component relative to the mold body.

[0005] Optionally, the top cylinder assembly includes a top cylinder, multiple connecting rods, a flange, a tray, and a flexible top rod. The top cylinder is disposed on the moving platform, the positioning rod is disposed on the top cylinder, the flange is coaxially connected to the top cylinder, one end of the connecting rod is connected to the top cylinder, and the other end of the connecting rod is connected to one side of the flange. The tray is disposed on the other side of the flange and supports the flexible top rod. The multiple connecting rods are circumferentially spaced around the flange to form an accommodating space. The cylinder assembly is partially located within the accommodating space. One end of the flexible top rod is coaxially connected to the flange, and the other end of the flexible top rod extends into one end of the tube blank to compress the filling medium.

[0006] Optionally, the cylinder assembly includes a cylinder, a wire rope, and a pusher. The cylinder is coaxially connected to the top cylinder and is located within the receiving space. One end of the wire rope is coaxially connected to the cylinder, and the other end of the wire rope passes through the flange, the flexible push rod, and the filling medium and is connected to the pusher. The pusher is located at the other end of the tube blank and abuts against the tube blank.

[0007] Optionally, a support component is also included. The worktable is further provided with a second groove, which is disposed between the first groove and the mold body. The support component is slidably disposed in the second groove and is used to support the flexible push rod.

[0008] Optionally, the mold body includes a lower mold assembly and an upper mold assembly. The lower mold assembly is disposed on the worktable and is spaced apart from the first groove. The upper mold assembly is disposed on the lower mold assembly, and the molding cavity is formed between the upper mold assembly and the lower mold assembly.

[0009] Optionally, a support device is also included, which is movable on the worktable and can also be raised and lowered relative to itself. The support device is used to support the upper mold assembly so that the upper mold assembly moves horizontally to directly above the lower mold assembly. The support device is also used to drive the upper mold assembly to move vertically so that the upper mold assembly and the lower mold assembly close together.

[0010] Optionally, the support device includes a lifting structure, a support structure, and a moving structure. The moving structure is located at the bottom of the lifting structure, and the support structure is located at the top of the lifting structure. The support structure is used to support the upper mold assembly.

[0011] Optionally, the support structure includes a support tray, a connector, a fixing member, a support member, and a pin. The support tray is fixed to the top of the lifting structure. One end of the connector is sleeved on the support tray, and the bottom end of the connector abuts against the support tray. The fixing member is inserted into one end of the connector and abuts against the support tray. The other end of the connector is inserted into the interior of the support member. The connector has multiple first connecting holes along its length. The support member has multiple second connecting holes along its length. The pin is used to be inserted into the first connecting holes and the second connecting holes.

[0012] Optionally, the number of the support devices is two, and the two support devices are arranged opposite to each other on the worktable. The two support devices are used to support the opposite ends of the upper mold assembly.

[0013] An assembly method for a pull-out forming apparatus, used in the aforementioned pull-out forming apparatus, the assembly method comprising the following steps: Place the lower mold assembly on the worktable, set the top cylinder on the moving platform, move the moving platform so that the positioning rod is inserted into the positioning hole, complete the positioning and assembly of the top cylinder and the lower mold assembly, and then fix the lower mold assembly and the top cylinder respectively. The pull cylinder is fixed to the top cylinder, and the flange is fixed to the top cylinder via a connecting rod. The top cylinder, pull cylinder, and flange are coaxially arranged. Then, the tray is fixed to the flange. The support assembly is slid along the second groove until it mates with the axis of the top cylinder and the support height is initially adjusted. Then, the rigid part of the flexible push rod is placed on the tray and the support assembly, and the support height of the support assembly is adjusted so that the flexible push rod is coaxially arranged with the top cylinder. Then, the support assembly is fixed in the second groove. Place the upper mold assembly on two support devices, move the upper mold assembly horizontally to initially position the upper mold assembly and the lower mold assembly, then operate the support devices to lower the upper mold assembly to complete the mold closing of the upper mold assembly and the lower mold assembly. After the mold is closed, remove the support devices, fix the upper mold assembly to the hydraulic press, and then use the hydraulic press to drive the upper mold assembly to rise, separating the upper mold assembly and the lower mold assembly. The pusher, filling medium, tube blank, and flexible ejector rod are connected in sequence with steel wire rope and placed in the forming cavity of the lower mold assembly. One end of the steel wire rope is connected and fixed to the pull cylinder, and the other end is connected and fixed to the pusher. Then, the upper mold assembly is lowered with a hydraulic press until it is closed with the lower mold assembly.

[0014] Compared to conventional push-bending forming devices that require positioning and assembling of the top cylinder and push cylinder, the pull-out forming device provided in this application, by setting up a push-bending component, connects the top cylinder component and the pull cylinder component together. Only one top cylinder component needs to be positioned. A positioning rod is set in the top cylinder component, and a positioning hole is opened in the mold body. Moving the moving platform drives the push-bending component and the positioning rod to move until the positioning rod can be inserted into the positioning hole, thus achieving rapid positioning and assembly of the push-bending component. This reduces the difficulty of positioning and assembling the push-bending component and the mold body, greatly improves the efficiency in the early stages of experimentation, and reduces the reliance on manual skill. Therefore, this application provides a rapid positioning and assembly pull-out forming device that can solve the problems of cumbersome, inefficient, time-consuming, labor-intensive, inaccurate positioning, and high operator skill requirements in traditional push-bending processes. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the pull-out forming device in one embodiment; Figure 2 This is a schematic diagram of the worktable of the top-forming device in one embodiment; Figure 3 This is a partial structural schematic diagram of the bending device in one embodiment; Figure 4 This is a partial structural schematic diagram of the top cylinder assembly in one embodiment; Figure 5 This is a schematic diagram of the bending device and lower mold assembly in one embodiment; Figure 6 This is a schematic diagram of the upper mold assembly in one embodiment; Figure 7 This is a schematic diagram of the positioning rod in one embodiment; Figure 8 This is a schematic diagram of the moving platform and top cylinder in one embodiment; Figure 9 This is a schematic diagram of the structure of the support component in one embodiment; Figure 10 This is a schematic diagram of the support device in one embodiment; Figure 11 This is a schematic diagram of the structure in one embodiment where the positioning rod and the positioning hole are engaged. Figure 12This is a schematic diagram of the mold closing process of the upper mold assembly and the lower mold assembly in one embodiment; Figure 13 This is a schematic diagram of the top-forming process in one embodiment.

[0017] 1. Workbench; 11. First groove; 12. Second groove; 2. Mold body; 21. Lower mold assembly; 211. Lower mold; 212. Lower pad; 22. Upper mold assembly; 221. Upper mold; 222. Upper pad; 3. Moving platform; 31. Rocker arm; 32. Lead screw; 33. Lead screw fixing base; 34. Placement platform; 4. Bending assembly; 41. Top cylinder assembly; 411. Top cylinder; 412. Connecting rod; 413. Flange; 414. Tray; 415. Flexible push rod; 416. Rigid part; 417. Flexible part; 42. 421. Cylinder scoring assembly; 422. Steel wire rope; 423. Push head; 43. Filling medium; 5. Positioning assembly; 51. Positioning rod; 52. Positioning hole; 6. Support assembly; 61. Pad block; 62. Housing; 63. Support plate; 64. Rotary wheel; 65. Turbine; 66. Worm gear; 67. Screw; 68. Ball; 7. Support device; 71. Lifting structure; 72. Support structure; 721. Support tray; 722. Connector; 723. Fixing component; 724. Support component; 725. Pin; 73. Moving structure; 8. Tube blank.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not 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 effort are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] refer to Figures 1 to 5 This application provides a pull-out forming device, which includes a worktable 1, a mold body 2, a moving platform 3, a bending assembly 4, and a positioning assembly 5. The worktable 1 has a first groove 11 spaced apart. The mold body 2 is disposed on the worktable 1, and the mold body 2 is spaced apart from the first groove 11. The mold body 2 has a forming cavity, and the tube blank 8 is disposed in the forming cavity. The moving platform 3 is slidably disposed in the first groove 11, and the moving platform 3 can reciprocate along the first groove 11. The bending assembly 4 includes a top cylinder assembly 41, a pull cylinder assembly 42, and a filling medium 43. The filling medium 43 is disposed inside the tube blank 8. One end of the top cylinder assembly 41 is disposed on the moving platform 3. The other end of component 41 is configured to extend into one end of tube blank 8 to compress filling medium 43, thereby generating internal pressure and acting on the interior of tube blank 8. Pull cylinder assembly 42 is connected to top cylinder assembly 41. Pull cylinder assembly 42 is configured to pass through filling medium 43 and abut against the other end of tube blank 8, and drive tube blank 8 to move along forming cavity. Positioning assembly 5 includes positioning rod 51 and positioning hole 52. Positioning rod 51 and positioning hole 52 are flush in the height direction. Positioning rod 51 is provided on push bending assembly 4. Mold body 2 has positioning hole 52. Moving platform 3 is used to drive push bending assembly 4 to move along first groove 11 so that positioning rod 51 is inserted into positioning hole 52, thereby realizing positioning of push bending assembly 4 relative to mold body 2.

[0023] Compared to conventional push-bending forming devices that require positioning and assembling of the top cylinder and the push cylinder, the pull-out forming device provided in this application, by setting a push-bending component 4 to connect the top cylinder component 41 and the pull cylinder component 42 together, only needs to be positioned for the top cylinder component 41. A positioning rod 51 is provided on the top cylinder component 41, and a positioning hole 52 is provided on the mold body 2. Moving the moving platform 3 drives the push-bending component 4 and the positioning rod 51 to move until the positioning rod 51 can be inserted into the positioning hole 52, thus achieving rapid positioning and assembly of the push-bending component 4. This reduces the difficulty of positioning and assembling the push-bending component 4 and the mold body 2, greatly improves the efficiency in the early stages of experimentation, and reduces the reliance on operator skill. Therefore, this application provides a rapid positioning and assembly pull-out forming device that can solve the problems of cumbersome, inefficient, time-consuming, labor-intensive, inaccurate positioning, and high operator skill requirements in traditional push-bending processes.

[0024] In this embodiment, the filling medium 43 includes multiple polyurethane filler blocks, the shape of which is adapted to the shape of the tube blank 8, and all are cylindrical. There are two first grooves 11, which are spaced apart.

[0025] refer to Figure 5 and Figure 6 The mold body 2 includes a lower mold assembly 21 and an upper mold assembly 22. The lower mold assembly 21 is disposed on the worktable 1 and is spaced apart from the first groove 11. The upper mold assembly 22 is disposed on the lower mold assembly 21, and a molding cavity is formed between the upper mold assembly 22 and the lower mold assembly 21.

[0026] Specifically, the lower mold assembly 21 includes a lower mold 211 and a lower pad 212. The lower mold 211 is fixed on the lower pad 212. The lower mold 211 has a positioning hole 52 on its side wall near the first groove 11. The upper mold assembly 22 includes an upper mold 221 and an upper pad 222. The upper mold 221 is fixed below the lower pad 212. The upper mold 221 and the lower mold 211 are joined to form a molding cavity.

[0027] Specifically, the forming cavity includes an input section, a bending section, and an output section. The input section and the bending section are respectively connected and set at both ends of the bending section. The tube blank 8 can enter the bending section through the input section and then move to the output section under the pulling force of the cylinder assembly 42.

[0028] Furthermore, the axis of the input segment is perpendicular to the axis of the output segment.

[0029] refer to Figure 3-5The top cylinder assembly 41 includes a top cylinder 411, multiple connecting rods 412, a flange 413, a tray 414, and a flexible push rod 415. The top cylinder 411 is mounted on the moving platform 3. The positioning rod 51 is located on the side of the top cylinder 411 near the lower mold 211. The flange 413 is coaxially connected to the top cylinder 411. One end of the connecting rod 412 is connected to the top cylinder 411, and the other end of the connecting rod 412 is connected to one side of the flange 413. The tray 414 has a semi-circular cross-section. The flexible push rod 415 includes a rigid part 416 and a flexible part 417. The flexible part 417 is bendable. The tray 414 is located on the other side of the flange 413 and supports the rigid part 416 of the flexible push rod 415. The rigid part 416 is coaxially arranged with the output section. Multiple connecting rods 412 are arranged circumferentially around the flange 413 to form an accommodating space. The cylinder assembly 42 is partially located in the accommodating space. The rigid part 416 of the flexible push rod 415 is coaxially connected with the flange 413. The flexible part 417 of the flexible push rod 415 can move along the bending section and extend into one end of the tube blank 8 to squeeze and fill the medium 43.

[0030] Specifically, flange 413 and multiple connecting rods 412 are all located on the output shaft of top cylinder 411.

[0031] refer to Figure 7 The positioning rod 51 is telescopic and consists of three sections that can be freely extended or shortened. When positioning is required, the positioning rod 51 is extended to engage with the positioning hole 52 of the lower mold 211 to achieve rapid positioning of the lower mold 211 and the top cylinder 411.

[0032] In this embodiment, there are two positioning rods 51 and two positioning holes 52. The two positioning rods 51 are respectively located at both ends of the same side of the top cylinder 411 and are symmetrical about the center line of the top cylinder 411. The two positioning holes 52 are respectively located at both ends of the same side of the lower mold 211 and are symmetrical about the center line of the output section of the lower mold 211.

[0033] Specifically, the rigid part 416 and the flexible part 417 are connected by threads.

[0034] Specifically, the top cylinder 411 is fixed to the moving platform 3 by bolts. After the positioning rod 51 and the positioning hole 52 are positioned and engaged, the moving platform 3 is fixed in the first groove 11 by bolts.

[0035] In this embodiment, reference Figure 1 and Figure 8The mobile platform 3 includes a rocker arm 31, a lead screw 32, a base for fixing the lead screw 32, and a placement platform 34. One end of the rocker arm 31 is connected to the lead screw 32, and the other end of the lead screw 32 is connected to the placement platform 34. The base for fixing the lead screw 32 is fixed on the worktable 1, and the base for fixing the lead screw 32 is threadedly connected to the middle part of the lead screw 32. By rotating the rocker arm 31, the mobile platform 3 can move along the first groove 11, thereby moving the top cylinder 411 for positioning.

[0036] refer to Figure 1 , Figure 3 and Figure 5 The cylinder assembly 42 includes a cylinder 421, a wire rope 422, and a pusher 423. The cylinder 421 is coaxially connected to the top cylinder 411 and is located within the accommodating space. One end of the wire rope 422 is coaxially connected to the cylinder 421, and the other end of the wire rope 422 passes through the flange 413, the flexible push rod 415, and the filling medium 43 and is connected to the pusher 423. The pusher 423 is located at the other end of the tube blank 8 and abuts against the tube blank 8.

[0037] Specifically, the pull cylinder 421 is located on the end face of the output shaft of the top cylinder 411, with the output shaft of the top cylinder 411 facing the lower mold 211. The wire rope 422 is located on the output shaft of the pull cylinder 421. The top cylinder 411 provides the counter-thrust force required for the tube blank 8 to be pulled and formed, and also serves as a platform for fixing the pull cylinder 421. One end of the wire rope 422 is connected to the pull cylinder 421, and the other end of the wire rope 422 is fixedly connected to the push head 423 by fastening screws. The pull cylinder 421 provides the tension required for the wire rope 422, thereby driving the push head 423 to move.

[0038] When the top forming is performed, the output shaft of the pulling cylinder 421 moves backward along its own axial direction to provide tension to the wire rope 422, pulling the wire rope 422 to move. At this time, the output shaft of the top cylinder 411 drives the flexible top rod 415 to move backward, and the pulling cylinder 421 also moves backward together with the output shaft of the top cylinder 411 to provide a counter-thrust force for the tube blank 8.

[0039] refer to Figure 1 , Figure 2 and Figure 9 The pull-out forming device also includes a support component 6. The worktable 1 is also provided with a second groove 12. The second groove 12 is disposed between the first groove 11 and the mold body 2. The support component 6 is slidably disposed in the second groove 12. The support component 6 is disposed below the flexible push rod 415. The support component 6 is used to support the rigid part 416 and the flexible part 417 of the flexible push rod 415 so that the rigid part 416 and the flexible part 417 can remain horizontal and not shift vertically. The support component 6 can rise and fall along its own axis to adapt to molds of different specifications.

[0040] Specifically, the first groove 11 and the second groove 12 extend in the same direction and are parallel to the axial direction of the input section. By setting the first groove 11 and the second groove 12, the moving platform 3 and the support assembly 6 move in a straight line along the first groove 11 and the second groove 12 respectively, which can realize the dynamic positioning of the mold body 2 and the top cylinder 411 of different specifications.

[0041] Specifically, the support assembly 6 includes a pad 61, a housing 62, a lifting assembly, and a support plate 63. The pad 61 is fixed to the bottom surface of the housing 62 by bolts, and the pad 61 is slidably connected to the second groove 12. The housing 62 is cylindrical. The lifting assembly is partially located inside the housing 62 and protrudes from the top surface of the housing 62 and is connected to the support plate 63. The support plate 63 has a V-shaped structure, and the lifting assembly is used to drive the support plate 63 to move up and down.

[0042] Furthermore, the lifting assembly includes a rotating wheel 64, a turbine 65, a worm gear 66, and a screw 67. The rotating wheel 64 is disposed outside the housing 62 and is connected to the worm gear 66. The worm gear 66 meshes with the turbine gear 65. The turbine gear 65 is sleeved outside the screw 67 and threadedly connected to the screw 67. A support plate 63 is disposed on the top of the screw 67. The rotation of the rotating wheel 64 drives the worm gear 66 to rotate. The rotation of the worm gear 66 drives the worm wheel to rotate. The worm wheel drives the screw 67 to rotate through the thread. The movement of the screw 67 causes the support plate 63 to move up and down.

[0043] The lifting assembly also includes multiple balls 68, which are spaced apart and embedded in the support plate 63. The balls 68 can rotate freely so that there is rolling friction between the balls 68 and the rigid part 416, which facilitates the back-and-forth movement of the rigid part 416 on the support plate 63.

[0044] refer to Figure 1 and Figure 10 The pull-out forming device also includes a support device 7, which can move on the worktable 1 and can also be raised and lowered relative to itself. The support device 7 is used to support the upper mold assembly 22 so that the upper mold assembly 22 moves horizontally to directly above the lower mold assembly 21. The support device 7 is also used to drive the upper mold assembly 22 to move vertically so that the upper mold assembly 22 and the lower mold assembly 21 can be closed.

[0045] refer to Figure 10 The support device 7 includes two lifting structures 71, a support structure 72, and two moving structures 73. The moving structure 73 is located at the bottom of the lifting structure 71, the support structure 72 is located at the top of the lifting structure 71, and the support structure 72 is located between the two lifting structures 71. The support structure 72 is used to support the upper mold assembly 22.

[0046] In this embodiment, the lifting structure 71 is a scissor structure, and the lifting function is achieved by the unfolding and retracting of the scissor structure. The moving structure 73 includes four spherical wheels, which are arranged in an array on the bottom surface of the lifting structure 71.

[0047] refer to Figure 1 The support structure 72 includes a support tray 721, a connector 722, a fixing member 723, a support member 724, and a pin 725. The support tray 721 is fixed to the top of the lifting structure 71. One end of the connector 722 is sleeved on the support tray 721, and the bottom end of the connector 722 abuts against the support tray 721 to restrict the vertical sliding of the connector 722. The fixing member 723 is inserted into one end of the connector 722 and abuts against the support tray 721, cooperating with the support tray 721 to restrict the horizontal sliding of the connector 722. The other end of the connector 722 is inserted into the interior of the support member 724. The connector 722 has multiple first connecting holes along its length, and the support member 724 has multiple second connecting holes along its length. The pin 725 is used to be inserted into the first connecting holes and the second connecting holes. By connecting different first connecting holes and second connecting holes, the pin 725 can change the bearing length of the support device 7 to adapt to different specifications of the mold body 2.

[0048] Specifically, the connector 722 also has a T-shaped hole, and the fastener 723 is a T-shaped part that is inserted into the T-shaped hole of the connector 722.

[0049] In this embodiment, there are two support devices 7, which are arranged opposite to each other on the working surface. The two support devices 7 are used to support the opposite ends of the upper pad 222.

[0050] Furthermore, the upper surfaces of the support tray 721 and the support member 724 are knurled to increase the friction between them and the upper pad 222 and prevent slippage.

[0051] This application also provides an assembly method for a pull-out forming apparatus, used in the aforementioned pull-out forming apparatus, the method comprising the following steps: S1, Reference Figure 11 Place the lower mold assembly 21 at an appropriate position on the workbench 1, and set the top cylinder 411 on the moving platform 3. Move the top cylinder 411 to the same straight line as the lower mold assembly 21 by rotating the rocker arm 31 for initial positioning. Extend the positioning rod 51 fixed on the top cylinder 411 to cooperate with the positioning hole 52 on the lower mold 211, so that the positioning rod 51 is inserted into the positioning hole 52, and the positioning assembly of the top cylinder 411 and the lower mold assembly 21 is completed. Then fix the lower mold assembly 21 and the top cylinder 411 respectively, and shorten the positioning rod 51 to the shortest length to save space. S2. Fix the pull cylinder 421 to the output shaft of the top cylinder 411, and fix the flange 413 to the output shaft of the top cylinder 411 through the connecting rod 412. The top cylinder 411, pull cylinder 421 and flange 413 are coaxially arranged. Then fix the tray 414 to the flange 413. Slide the support assembly 6 along the second groove 12 to match the axis of the top cylinder 411 and initially adjust the support height. Then place the rigid part 416 of the flexible push rod 415 on the tray 414 and the support assembly 6, and adjust the support height of the support assembly 6 so that the flexible push rod 415 is coaxially arranged with the top cylinder 411. Then fix the support assembly 6 in the second groove 12. S3, Reference Figure 12 The upper mold assembly 22 is placed on two support devices 7. The upper mold assembly 22 can move in any direction on the worktable 1 through the support devices 7, and the upper mold assembly 22 can be raised and lowered by operating the support devices 7. The upper mold assembly 22 is moved horizontally to make the upper mold assembly 22 and the lower mold assembly 21 initially positioned. Then, the support devices 7 are operated to make the upper mold assembly 22 descend to complete the mold closing of the upper mold assembly 22 and the lower mold assembly 21. During the descent of the upper mold assembly 22, the support devices 7 need to be moved to make fine adjustments to the mold closing of the upper mold assembly 22 and the lower mold assembly 21 until the upper mold assembly 22 and the lower mold assembly 21 are aligned and closed. After the mold is closed, the support devices 7 are removed. Then, the upper mold assembly 22 is fixedly connected to the hydraulic press. The hydraulic press is then used to drive the upper mold assembly 22 to rise. The upper mold assembly 22 and the lower mold assembly 21 are separated once for further assembly and experimentation. S4. Connect the pusher 423, filling medium 43, tube blank 8 and flexible push rod 415 in sequence using steel wire rope 422, and place them in the forming cavity of the lower mold assembly 21. One end of the steel wire rope 422 is connected and fixed to the output shaft of the pull cylinder 421, and the other end is connected and fixed to the pusher 423 to complete the preparation before the pull forming experiment. Then, use a hydraulic press to lower the upper mold assembly 22 until it is closed with the lower mold assembly 21.

[0052] The specific steps of the pull-top forming method are as follows: Pull-top forming adopts an active pulling force and passive counter-pull force loading form. The pulling cylinder 421 actively provides the pulling force to pull the tube blank 8 towards the bending section for forming, while the top cylinder 411 passively provides the counter-pull force to squeeze the polyurethane filler to generate internal pressure. The front and rear limits of the pulling cylinder 421 are set in advance to control the feed amount of the tube blank 8, and the maximum pressure of the top cylinder 411 is set in advance to control the maximum counter-pull force; during the bending forming process, only the pulling cylinder 421 needs to be operated until the tube blank 8 is bent and formed. After the bending forming is completed, the mold is opened and the push head 423 at the rear end of the tube blank 8 is released and removed, so that the wire rope 422 no longer provides the pulling force to the tube blank 8. It is worth noting that during the removal of the push head 423, the position of the tube blank 8 in the mold cavity should be avoided; the mold is closed again and the pulling cylinder 421 is used to pull the wire rope 422 out of the tube blank 8. After removing the wire rope 422, the mold is opened and the tube blank 8 is removed. Since the wire rope 422 has been removed, the polyurethane filler block inside the tube blank 8 is easier to remove, which further improves work efficiency.

[0053] The presence of the 422 steel wire rope tension makes the polyurethane filler blocks more tightly bonded in the curved section, and the direction of tension is less likely to deviate. This prevents the problem of wrinkling on the inner side of the pipe wall caused by gaps due to the tilting of the polyurethane filler blocks.

[0054] Compared to the traditional push-bending forming method, which requires the pusher 423 to cooperate with both the pusher cylinder and the mold simultaneously, making it more difficult and prone to positioning misalignment, the pusher 423 may scrape against the mold during the forming process, damaging both the mold and the pusher 423. The increased resistance of the pusher 423 due to positioning misalignment can lead to a sharp increase in thrust, potentially causing more serious experimental safety accidents and damaging the equipment. In contrast, the pusher 423 of the present invention does not require positioning cooperation, thus avoiding the problems that occur in the traditional push-bending forming method. The experiment is safer and simpler, reducing the wear and tear on equipment and molds.

[0055] This application incorporates a mobile platform 3, a support component 6, and a support device 7. The mobile platform 3 enables the top cylinder 411 to quickly achieve positioning and assembly of molds of different specifications, offering high flexibility. The support device 7 prevents the flexible ejector rod 415 from shifting vertically during the forming process, thus avoiding the need for repositioning and assembly after each experiment, reducing the burden on personnel. Furthermore, its lifting function can adapt to molds of different specifications, making it widely applicable, convenient, and practical, significantly reducing costs compared to guide sleeve structures or extended molds. The support device 7 can move in any direction via the spherical wheels at the bottom, offering high flexibility and making mold closing simpler and more efficient, greatly reducing the difficulty and danger of mold closing, alleviating the burden on personnel, and improving mold closing efficiency.

[0056] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A pull-out forming device, characterized in that, include: The worktable has spaced-out first grooves; A mold body is disposed on the worktable, the mold body is spaced apart from the first groove, the mold body has a forming cavity, and the tube blank is disposed in the forming cavity; A mobile platform is slidably disposed within the first groove, and the mobile platform is capable of reciprocating along the first groove; The bending assembly includes a top cylinder assembly, a pull cylinder assembly, and a filling medium. The filling medium is disposed inside the tube blank. One end of the top cylinder assembly is disposed on the moving platform, and the other end of the top cylinder assembly is configured to extend into one end of the tube blank and squeeze the filling medium to generate internal pressure and act on the inside of the tube blank. The pull cylinder assembly is connected to the top cylinder assembly and is configured to pass through the filling medium and abut against the other end of the tube blank, and drive the tube blank to move along the forming cavity. The positioning component includes a positioning rod and a positioning hole. The positioning rod is disposed in the top cylinder component. The mold body has a positioning hole. The moving platform is used to drive the bending push component to move along the first groove so that the positioning rod is inserted into the positioning hole, thereby realizing the positioning of the bending push component relative to the mold body.

2. The pull-out forming apparatus according to claim 1, characterized in that, The top cylinder assembly includes a top cylinder, multiple connecting rods, a flange, a tray, and a flexible top rod. The top cylinder is disposed on the moving platform, the positioning rod is disposed on the top cylinder, the flange is coaxially connected to the top cylinder, one end of the connecting rod is connected to the top cylinder, and the other end of the connecting rod is connected to one side of the flange. The tray is disposed on the other side of the flange and supports the flexible top rod. The multiple connecting rods are circumferentially spaced around the flange to form an accommodating space. The cylinder assembly is partially located within the accommodating space. One end of the flexible top rod is coaxially connected to the flange, and the other end of the flexible top rod extends into one end of the tube blank to compress the filling medium.

3. The pull-out forming apparatus according to claim 2, characterized in that, The cylinder assembly includes a cylinder, a wire rope, and a pusher. The cylinder is coaxially connected to the top cylinder and is located within the receiving space. One end of the wire rope is coaxially connected to the cylinder, and the other end of the wire rope passes through the flange, the flexible push rod, and the filling medium and is connected to the pusher. The pusher is located at the other end of the tube blank and abuts against the tube blank.

4. The pull-out forming apparatus according to claim 2, characterized in that, It also includes a support component, and the worktable is further provided with a second groove, which is disposed between the first groove and the mold body. The support component is slidably disposed in the second groove, and the support component is used to support the flexible push rod.

5. The pull-out forming apparatus according to claim 1, characterized in that, The mold body includes a lower mold assembly and an upper mold assembly. The lower mold assembly is disposed on the worktable and is spaced apart from the first groove. The upper mold assembly is disposed on the lower mold assembly, and the molding cavity is formed between the upper mold assembly and the lower mold assembly.

6. The pull-out forming apparatus according to claim 5, characterized in that, It also includes a support device that is movable on the worktable and can also be raised and lowered relative to itself. The support device is used to support the upper mold assembly so that the upper mold assembly moves horizontally to directly above the lower mold assembly. The support device is also used to drive the upper mold assembly to move vertically so that the upper mold assembly and the lower mold assembly can be closed.

7. The pull-out forming apparatus according to claim 6, characterized in that, The support device includes a lifting structure, a support structure, and a moving structure. The moving structure is located at the bottom of the lifting structure, and the support structure is located at the top of the lifting structure. The support structure is used to support the upper mold assembly.

8. The pull-out forming apparatus according to claim 7, characterized in that, The support structure includes a support tray, a connector, a fixing member, a support member, and a pin. The support tray is fixed to the top of the lifting structure. One end of the connector is sleeved on the support tray, and the bottom end of the connector abuts against the support tray. The fixing member is inserted into one end of the connector and abuts against the support tray. The other end of the connector is inserted into the interior of the support member. The connector has multiple first connecting holes along its length. The support member has multiple second connecting holes along its length. The pin is used to be inserted into the first connecting holes and the second connecting holes.

9. The pull-out forming apparatus according to claim 7, characterized in that, The number of the support devices is two, and the two support devices are arranged opposite to each other on the worktable. The two support devices are used to support the opposite ends of the upper mold assembly.

10. A method for assembling a pull-out forming device, used in the pull-out forming device according to any one of claims 1-9, characterized in that, The assembly method includes: Place the lower mold assembly on the worktable, set the top cylinder on the moving platform, move the moving platform so that the positioning rod is inserted into the positioning hole, complete the positioning and assembly of the top cylinder and the lower mold assembly, and then fix the lower mold assembly and the top cylinder respectively. The pull cylinder is fixed to the top cylinder, and the flange is fixed to the top cylinder via a connecting rod. The top cylinder, pull cylinder, and flange are coaxially arranged. Then, the tray is fixed to the flange. The support assembly is slid along the second groove until it mates with the axis of the top cylinder and the support height is initially adjusted. Then, the rigid part of the flexible push rod is placed on the tray and the support assembly, and the support height of the support assembly is adjusted so that the flexible push rod is coaxially arranged with the top cylinder. Then, the support assembly is fixed in the second groove. Place the upper mold assembly on two support devices, move the upper mold assembly horizontally to initially position the upper mold assembly and the lower mold assembly, then operate the support devices to lower the upper mold assembly to complete the mold closing of the upper mold assembly and the lower mold assembly. After the mold is closed, remove the support devices, fix the upper mold assembly to the hydraulic press, and then use the hydraulic press to drive the upper mold assembly to rise, separating the upper mold assembly and the lower mold assembly. The pusher, filling medium, tube blank, and flexible ejector rod are connected in sequence with steel wire rope and placed in the forming cavity of the lower mold assembly. One end of the steel wire rope is connected and fixed to the pull cylinder, and the other end is connected and fixed to the pusher. Then, the upper mold assembly is lowered with a hydraulic press until it is closed with the lower mold assembly.

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