Forming device and method for slender strip-shaped special-shaped tubular assembly

Abstract

The invention relates to the technical field of special-shaped pipe forming, in particular to a forming device and method for a long and thin strip-shaped special-shaped tubular assembly. The forming device mainly comprises a forming support, the forming support comprises a water tank, the top end of the water tank is open, the water tank is filled with water, and two U-shaped arm plates located at the two ends of the water tank are fixedly installed on the top face of the water tank; a mold closing hydraulic device is fixedly installed between the two U-shaped arm plates, two upper mold plate assemblies are arranged below the mold closing hydraulic device, and two lower mold plate assemblies are arranged below the upper mold plate assemblies. By arranging the double-station lower mold plate assembly and the double-station upper mold plate assembly and cooperating with a transverse offset structure of the mold closing hydraulic device, the two stations can alternately conduct blank pipe forming and feeding and discharging operation, when one station is in the forming procedures of mold closing, liquid filling, pressure maintaining and the like, the other station can synchronously complete formed part taking-out and new blank pipe filling, and the forming efficiency is improved. The standby time of the equipment is obviously shortened, and the problem of low production efficiency caused by single-station serial operation is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of special-shaped tube forming, and in particular to a forming device and method for a slender strip-shaped special-shaped tubular component. Background Art

[0002] The existing forming device of slender strip-shaped special-shaped tubular components is mainly composed of a forming mold, a mold clamping press, a hydraulic system and an end sealing mechanism. During operation, the blank tube is first placed in the mold cavity, and then the mold clamping press drives the mold to close. After that, the plugs of the end sealing mechanism are inserted into both ends of the blank tube. Then, the hydraulic system injects high-pressure liquid into the blank tube through the injection channel of the plug, causing the blank tube to undergo plastic deformation under the action of pressure and finally fit into the mold cavity to complete the forming. The sealing between the plug and the inner wall of the blank tube mainly relies on a rubber sealing ring, which is squeezed by mechanical force to achieve sealing.

[0003] However, the existing forming device for slender strip-shaped special-shaped tubular components has only one workstation, at which processes such as mold closing, liquid filling, pressure holding, pressure relief and mold opening need to be completed, resulting in long waiting time and low production efficiency; moreover, the plug sealing structure is simple, and a single sealing ring is prone to deformation and displacement under the impact of high-pressure liquid, resulting in seal failure and liquid leakage, which affects the forming accuracy of the blank tube; at the same time, the assembly and disassembly of the plug mostly relies on manual labor, and a separate plug insertion and removal process needs to be set during the mold closing and mold opening process, which prolongs the equipment standby time, and the loading and unloading and sealing operations are not smoothly connected, which significantly reduces production efficiency and is difficult to adapt to large-scale continuous production needs.

[0004] Therefore, it is urgent to design a forming device for a slender strip-shaped special-shaped tubular component to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a forming device and method for slender strip-shaped special-shaped tubular components, so as to solve the problems proposed in the above background technology, such as the single-station design resulting in low production efficiency, the simple plug sealing structure prone to sealing failure, and the plug assembly and disassembly relying on manual labor resulting in poor operation connection.

[0006] To achieve the above object, the present invention provides the following technical solutions: A forming device for a slender strip-shaped special-shaped tubular component, comprising: a forming bracket, the forming bracket comprising a water tank, the top of the water tank is open, the water tank is filled with water, two U-shaped arm plates are fixedly installed on the top surface of the water tank, respectively located at both ends thereof, a mold clamping hydraulic press is fixedly installed between the two U-shaped arm plates, two upper template assemblies are provided below the mold clamping hydraulic press, two lower template assemblies are provided below the upper template assembly, a support plate and a fixed platform are fixedly installed below the lower template assembly, the support plate and the fixed platform are fixedly connected to the bottom surface of the water tank inner cavity, the two lower template assemblies are respectively aligned one by one with the two upper template assemblies, a buffer mechanism is fixedly installed on the top of the upper template assembly, a mold opening mechanism and a plug assembly are fixedly installed between the mutually aligned lower template assembly and upper template assembly, a pressure holding mechanism is fixedly installed between the buffer mechanism and the mold opening mechanism, and a control box is fixedly installed on a U-shaped arm plate.

[0007] Preferably, the lower template assembly includes a lower mounting shell, and the upper template assembly includes an upper mounting shell. The two ends of the lower mounting shell and the upper mounting shell that are close to each other are open, and the ends of the lower mounting shell and the upper mounting shell facing the outside of the water tank are open. The lower mounting shell and the upper mounting shell are both slidably plugged into the interior of the template body, and the end face of the template body is provided with a T-shaped slot, and a T-shaped rail is slidably plugged into the interior of the T-shaped slot. The T-shaped rail is fixedly connected to the inner wall of the lower mounting shell and the upper mounting shell, and the two template bodies are provided with blank pipe grooves on both sides close to each other, and the inner wall of the blank pipe groove is provided with a characteristic groove. The interior of the blank pipe groove is filled with blank pipes, and the blank pipes are immersed in water.

[0008] Preferably, electromagnetic telescopic rods are fixedly installed on both sides of the lower mounting shell and the upper mounting shell away from the template body, the electromagnetic telescopic rods are electrically connected to the control box, fixed through-holes are opened on the lower mounting shell and the upper mounting shell, the extension rods in the electromagnetic telescopic rods are movably inserted in the fixed through-holes, and the end faces of the extension rods are flush with the inner wall of the blank tube groove.

[0009] Preferably, the lower mounting shell and the upper mounting shell are fixedly installed with fixing cylinders on both sides away from the template body, and the end faces of the fixing cylinders are threadedly installed with locking bolts, which pass through the fixing cylinders, and one end of the locking bolt is fixedly connected to an operating cap, and the other end of the locking bolt is fixedly connected to a locking frustum, which can enter the fixing cylinder, and the lower mounting shell and the upper mounting shell are both provided with frustum-shaped grooves, and the small diameter end of the frustum-shaped groove extends to the interior of the template body, and the locking frustum is adapted to the frustum-shaped groove.

[0010] Preferably, the mold closing hydraulic device includes a closing plate, which is located between two U-shaped arm plates, and a closing slide rod is slidably inserted on the closing plate, and both ends of the closing slide rod are fixedly connected to the two U-shaped arm plates respectively, and a driving screw is threadedly installed on the closing plate, and both ends of the driving screw are fixedly connected to the two U-shaped arm plates respectively, and a servo motor is fixedly installed at one end of the driving screw, and the servo motor is bolted on a U-shaped arm plate, and the servo motor is electrically connected to the control box. A hydraulic cylinder located in the center is bolted on the closing plate, and the hydraulic cylinder is connected to the hydraulic system of the peripheral device and is controlled by the control box. The telescopic column inside the hydraulic cylinder passes through the closing plate, and a pressure sensor is fixedly installed on the end face of the telescopic column, and the pressure sensor is connected to the control box for transmission.

[0011] Preferably, the buffer mechanism includes a buffer plate, which is located between the two U-shaped arm plates and below the closing plate. The buffer plate is adapted to the hydraulic cylinder. The surface of the buffer plate away from the closing plate is fixedly connected to a buffer column located at its end. The outside of the buffer column is movably sleeved with a buffer spring, one end of the buffer spring is fixedly connected to the surface of the buffer plate, and the other end of the buffer spring is fixedly connected to a small buffer plate. The small buffer plate is slidably sleeved on the outside of the buffer column and is transmission-connected to the upper mounting shell.

[0012] Preferably, the mold opening mechanism includes a mold opening base plate, the mold opening base plate is connected to the end of the lower mounting shell, the top surface of the mold opening base plate is fixedly connected to a mold opening spring, the top of the mold opening spring is fixedly connected to the surface of the buffer plate, the buffer column is movably inserted into the mold opening base plate, and the end of the buffer column is fixedly connected to a stop cap.

[0013] Preferably, the plug assembly includes two extension plates, which are respectively fixedly connected to the two end surfaces of the lower mounting shell, the mold bottom plate is connected to the end of the extension plate, the top surface of the extension plate is provided with a guide slide groove, the inner wall of the guide slide groove is provided with a T-shaped slide groove, the inside of the T-shaped slide groove is slidably plugged with a T-shaped slide rail, the T-shaped slide rail is fixedly connected with a guide slider, the top surface of the guide slider is fixedly connected with a limit slider, the side surface of the limit slider is fixedly connected with a fixed short shaft, the outer movably sleeve of the fixed short shaft is provided with a rotating wheel, the buffer plate is fixedly connected with a force vertical plate, the force The vertical plate is fixedly connected to the end face of the upper mounting shell, and a force-applying inclined surface is provided at the corner of the force-applying vertical plate close to the lower mounting shell. The rotating wheel rolls on the force-applying inclined surface. A traction spring is fixedly connected to the side of the limit slider away from the lower mounting shell, and the other end of the traction spring is fixedly connected to a traction plate, and the traction plate is fixedly connected to the end of the mold bottom plate and the end of the extension plate. A plug body is fixedly connected to the other side of the limit slider, and a sealing ring groove is provided on the plug body. A sealing gasket is embedded in the sealing ring groove, and a chamfered inclined surface is provided on the side of the sealing gasket close to the lower mounting shell.

[0014] Preferably, the plug body is provided with an installation channel, the inner wall of the installation channel is provided with a thread, and a threaded tube is installed in the installation channel in cooperation with the thread inside the installation channel, and the end of the threaded tube is fixedly connected to the limit slider, and a fixed cavity is provided inside the limit slider, the fixed cavity is connected with the threaded tube, the radial depth of the sealing ring groove is deeper than the depth of the conventional setting, and the radial thickness of the sealing gasket is thicker than the thickness of the conventional setting, and a plurality of constant pressure through holes are provided at equal distances on the inner wall of the installation channel, the constant pressure through holes are connected with the sealing ring groove, the end of the plug body is fixedly connected with a guide frustum, and a channel hole connected with the installation channel is provided on the end surface of the guide frustum, a fixed cavity inside a limit slider is fixedly connected with a booster pump through a hose, and a pressure relief valve is fixedly connected to the hose, the booster pump is electrically connected to the control box, the booster pump is fixedly installed on the surface of the water tank and connected with the inner cavity of the water tank, the fixed cavity inside the other limit slider is fixedly connected with an exhaust valve, and the exhaust valve is fixedly installed on the top surface of the limit slider.

[0015] Preferably, the pressure maintaining mechanism includes a pressure maintaining rod and a pressure maintaining shell, one end of the pressure maintaining rod is fixedly connected to the bottom surface of the buffer plate, the other end of the pressure maintaining rod passes through the buffer small plate and the mold bottom plate, a plurality of pressure maintaining ring grooves are equidistantly provided on the surface of the pressure maintaining rod, the cross-section of the pressure maintaining ring groove is a right-angled triangle, the pressure maintaining shell is fixedly connected to the bottom surface of the lower mounting shell, a guide sliding hole is provided inside the pressure maintaining shell, and a pressure maintaining cover plate is bolted on one end of the pressure maintaining shell, and an electromagnet and a support spring are fixedly installed on the surface of the pressure maintaining cover plate in contact with the pressure maintaining shell, the electromagnet is electrically connected to the control box, and the other end of the support spring is fixedly connected to the guide plate, the electromagnet, the support spring, and the guide plate are all movably plugged into the inside of the guide sliding hole, and the side of the guide plate close to the electromagnet is fixedly connected to a strong magnetic plate, the strong magnetic plate is adapted to the electromagnet, and a fixed chamfer is provided on the end face of the other end of the guide plate, and the fixed chamfer is adapted to the inclined surface inside the pressure maintaining ring groove.

[0016] Preferably, a method for forming a slender strip-shaped special-shaped tubular component comprises the following steps: The first step is to place the first billet tube in the billet tube groove; The second step is to use the forming bracket to control the action of the mold clamping hydraulic press. The mold clamping hydraulic press then moves the upper mold assembly toward the lower mold assembly through the buffer mechanism. The upper and lower mold assemblies are then clamped. At the same time, the upper mold assembly drives the plug assembly to move. The plug assembly then blocks the end of the blank tube. The pressure holding mechanism fixes the clamping state between the upper and lower mold assemblies. Step 3: Use the forming bracket to control the plug assembly, and then fill the first billet tube with high-pressure water. Then use the forming bracket to control the offset of the mold clamping hydraulic press to align the mold clamping hydraulic press with the other upper template assembly. Then, fill the second billet tube into the lower template assembly corresponding to the upper template assembly and proceed with subsequent operations. In the fourth step, the first billet tube is plastically deformed under the action of water pressure and the pressure is maintained for a period of time to complete the molding work. Then, the pressure relief of the plug assembly is controlled by the molding bracket, and then the pressure holding mechanism is controlled to be released using the molding bracket. After that, the upper template assembly is separated from the lower template assembly under the elastic force of the mold opening mechanism, and then the molded billet tube is taken out.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By setting up a double-station lower template assembly and upper template assembly, and coordinating with the lateral offset structure of the mold clamping hydraulic press, the two stations can alternately perform billet tube forming and loading and unloading operations. When one station is in the molding process such as mold clamping, liquid filling, and pressure holding, the other station can simultaneously complete the removal of the molded part and the loading of the new billet tube, significantly shortening the equipment standby time and solving the problem of low production efficiency caused by single-station serial operation.

[0018] Through the plug body with a sealing ring groove and the deformable sealing gasket structure in the plug assembly, combined with the constant pressure through hole and annular cavity design, the high-pressure liquid simultaneously applies radial and axial pressure to the sealing gasket during the filling process. The sealing gasket produces bidirectional deformation under the action of pressure, which not only expands the fitting area with the inner wall of the blank tube, but also enhances the sealing with the plug body, solving the problem that a single sealing ring is prone to displacement and failure under high-pressure impact, and significantly improving the sealing reliability and forming accuracy.

[0019] Through the elastic reset structure of the mold opening mechanism and the clamping and locking structure of the pressure holding mechanism, combined with the linkage design of the force-applying vertical plate and the rotating wheel, the plug is automatically inserted into the end of the blank tube during the mold closing process. When the mold is opened, the clamping is released with the help of electromagnetic repulsion and the plug is automatically pulled out under the action of elastic force, eliminating the separate process of manual insertion and removal of the plug, achieving seamless connection between loading and unloading and sealing operations, solving the problem of extended equipment standby time caused by manual operation, significantly improving production continuity, and increasing production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the middle mold clamping hydraulic press; Figure 3 For the present invention Figure 1 Schematic diagram of the three-dimensional structure with the middle forming bracket and the lower template assembly separated; Figure 4 For the present invention Figure 3 Schematic diagram of the three-dimensional structure of the middle and lower template components and the upper template components; Figure 5 For the present invention Figure 3 Schematic diagram of the split three-dimensional structure of the middle and lower template components and the upper template components; Figure 6 For the present invention Figure 4 Schematic diagram of the three-dimensional structure at the middle force-applying vertical plate; Figure 7 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the boost pump; Figure 8 For the present invention Figure 5 Schematic diagram of the three-dimensional structure of the middle fixed cylinder; Figure 9 For the present invention Figure 1 Schematic diagram of the split three-dimensional structure of the middle plug body; Figure 10 For the present invention Figure 4 Schematic diagram of the disassembled three-dimensional structure of the medium pressure shell.

[0021] In the picture: 1. Molding bracket; 101. Water tank; 102. U-shaped arm plate; 103. Support plate; 104. Fixing platform; 105. Control box; 2. Lower template assembly; 200, blank tube; 3. Upper template assembly; 301. Lower mounting shell; 302. Upper mounting shell; 303. Template body; 304. T-slot; 305. T-rail; 306. Billet tube slot; 307. Feature slot; 308. Electromagnetic telescopic rod; 309. Fixing hole; 310. Fixing cylinder; 311. Locking bolt; 312. Operating cap; 313. Locking cone; 314. Cone-shaped groove; 4. Mold closing hydraulic device; 401. Mold closing plate; 402. Mold closing slide; 403. Drive screw; 404. Servo motor; 405. Hydraulic cylinder; 5. Buffer mechanism; 501. Buffer plate; 502. Buffer column; 503. Buffer spring; 504. Buffer plate; 6. Mold opening mechanism; 601. Mold opening base plate; 602. Mold opening spring; 7. Plug assembly; 701. Extension plate; 702. Guide chute; 703. T-shaped chute; 704. T-shaped slide rail; 705. Guide slider; 706. Limit slider; 707. Fixed short shaft; 708. Rotating wheel; 709. Force-applying vertical plate; 710. Force-applying inclined surface; 711. Pull spring; 712. Pull plate; 713. Plug body; 714. Sealing ring groove; 715. Sealing gasket; 716. Chamfered inclined surface; 717. Mounting channel; 718. Threaded pipe; 719. Constant pressure through hole; 720. Guide frustum; 721. Booster pump; 722. Exhaust valve; 8. Pressure-maintaining mechanism; 801. Pressure-maintaining rod; 802. Pressure-maintaining ring groove; 803. Pressure-maintaining shell; 804. Guide slide hole; 805. Pressure-maintaining cover; 806. Electromagnet; 807. Opening spring; 808. Guide plate; 809. Strong magnetic plate; 810. Fixed chamfer. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0024] like Figures 1-10 As shown, the present application provides a forming device for a slender strip-shaped special-shaped tubular component, comprising: a forming bracket 1, the forming bracket 1 comprising a water tank 101, the top of the water tank 101 is open, the water tank 101 is filled with water, two U-shaped arm plates 102 are fixedly installed on the top surface of the water tank 101, respectively located at both ends thereof, a clamping hydraulic press 4 is fixedly installed between the two U-shaped arm plates 102, two upper template assemblies 3 are provided below the clamping hydraulic press 4, two lower template assemblies 2 are provided below the upper template assemblies 3, and a fixed mold assembly 4 is provided below the lower template assembly 2. A support plate 103 and a fixed platform 104 are fixedly installed, and the support plate 103 and the fixed platform 104 are fixedly connected to the bottom surface of the inner cavity of the water tank 101. The two lower template assemblies 2 are aligned one by one with the two upper template assemblies 3 respectively. A buffer mechanism 5 is fixedly installed on the top of the upper template assembly 3. A mold opening mechanism 6 and a plug assembly 7 are fixedly installed between the aligned lower template assembly 2 and the upper template assembly 3. A pressure holding mechanism 8 is fixedly installed between the buffer mechanism 5 and the mold opening mechanism 6. A control box 105 is fixedly installed on a U-shaped arm plate 102.

[0025] See also Figure 5 The lower template assembly 2 includes a lower mounting shell 301, and the upper template assembly 3 includes an upper mounting shell 302. The two ends of the lower mounting shell 301 and the upper mounting shell 302 that are close to each other are open, and the ends of the lower mounting shell 301 and the upper mounting shell 302 facing the outside of the water tank 101 are open. The lower mounting shell 301 and the upper mounting shell 302 are both slidably plugged with template bodies 303. The end faces of the template bodies 303 are provided with T-slots 304, and T-rails 305 are slidably plugged inside the T-slots 304. The T-rails 305 are fixedly connected to the inner walls of the lower mounting shell 301 and the upper mounting shell 302. The two template bodies 303 are both provided with blank pipe grooves 306 on both sides that are close to each other, and the inner walls of the blank pipe grooves 306 are provided with characteristic grooves 307. The blank pipe grooves 306 are filled with blank pipes 200, and the blank pipes 200 are immersed in water.

[0026] The cooperation between the T-slot 304 and the T-rail 305 facilitates the replacement of the template body 303 , and the replacement speed is faster, which helps to increase production efficiency.

[0027] By immersing the blank tube 200 in water, the water filling time can be reduced, which helps to increase production efficiency.

[0028] See also Figure 5 Electromagnetic telescopic rods 308 are fixedly installed on both sides of the lower mounting shell 301 and the upper mounting shell 302 away from the template body 303. The electromagnetic telescopic rods 308 are electrically connected to the control box 105. Fixed through-holes 309 are opened on the lower mounting shell 301 and the upper mounting shell 302. The extending rods in the electromagnetic telescopic rods 308 are movably inserted into the fixed through-holes 309, and the end faces of the extending rods are flush with the inner wall of the blank tube groove 306.

[0029] The formed blank tube 200 can be ejected by the electromagnetic telescopic rod 308, which facilitates unloading and helps to increase production efficiency.

[0030] See also Figure 5 and Figure 8 The lower mounting shell 301 and the upper mounting shell 302 are both fixedly installed with fixing cylinders 310 on both sides away from the template body 303, and the end surface of the fixing cylinder 310 is threadedly installed with a locking bolt 311, which passes through the fixing cylinder 310, and one end of the locking bolt 311 is fixedly connected to an operating cap 312, and the other end of the locking bolt 311 is fixedly connected to a locking frustum 313, which can enter the fixing cylinder 310, and a frustum-shaped groove 314 is provided on the lower mounting shell 301 and the upper mounting shell 302, and the small diameter end of the frustum-shaped groove 314 extends to the interior of the template body 303, and the locking frustum 313 is adapted to the frustum-shaped groove 314.

[0031] The locking cone 313 and the cone-shaped groove 314 are plugged into each other to fix the template body 303 so that it cannot fall off. At the same time, pressure can be provided to the template body 303 so that the inner wall of the T-slot 304 and the surface of the T-rail 305 fit together, thereby pressing and preventing the template body 303 from shaking.

[0032] See also Figure 2The mold clamping hydraulic device 4 includes a clamping plate 401, which is located between the two U-shaped arm plates 102. A clamping slide 402 is slidably inserted on the clamping plate 401, and both ends of the clamping slide 402 are fixedly connected to the two U-shaped arm plates 102. A driving screw 403 is threadedly installed on the clamping plate 401, and both ends of the driving screw 403 are fixedly connected to the two U-shaped arm plates 102. A servo motor 404 is fixedly installed on one end of the driving screw 403. The servo motor 404 is bolted on one U-shaped arm plate 102. The servo motor 404 is electrically connected to the control box 105. A hydraulic cylinder 405 located in the middle is bolted on the clamping plate 401. The hydraulic cylinder 405 is connected to the hydraulic system of the peripheral device and is controlled by the control box 105. The telescopic column inside the hydraulic cylinder 405 passes through the clamping plate 401, and a pressure sensor is fixedly installed on the end face of the telescopic column. The pressure sensor is transmitted to the control box 105.

[0033] Used to switch workstations, allowing two workstations to work alternately, helping to increase production efficiency.

[0034] The pressure sensor is used to detect the mold clamping pressure, and the mold clamping pressure value is preset in the control box 105 .

[0035] See also Figure 4 The buffer mechanism 5 includes a buffer plate 501, which is located between the two U-shaped arm plates 102 and below the closing plate 401. The buffer plate 501 is adapted to the hydraulic cylinder 405. The surface of the buffer plate 501 away from the closing plate 401 is fixedly connected to a buffer column 502 located at its end. The outside of the buffer column 502 is movably sleeved with a buffer spring 503. One end of the buffer spring 503 is fixedly connected to the surface of the buffer plate 501, and the other end of the buffer spring 503 is fixedly connected to a buffer plate 504. The buffer plate 504 is slidably sleeved on the outside of the buffer column 502 and is transmission-connected to the upper mounting shell 302.

[0036] Apply pressure to the upper template assembly 3 to stabilize the mold closing between the lower template assembly 2 and the upper template assembly 3.

[0037] See also Figure 4 The mold opening mechanism 6 includes a mold opening base plate 601, which is connected to the end of the lower mounting shell 301. The top surface of the mold opening base plate 601 is fixedly connected to a mold opening spring 602. The top of the mold opening spring 602 is fixedly connected to the surface of the buffer plate 504. The buffer column 502 is movably plugged into the mold opening base plate 601, and the end of the buffer column 502 is fixedly connected to a blocking cap.

[0038] It is used to realize automatic mold opening, making the blanking process faster and helping to increase production efficiency.

[0039] See also Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 9 The plug assembly 7 includes two extension plates 701, which are respectively fixedly connected to the two end surfaces of the lower mounting shell 301, and the mold bottom plate 601 is connected to the end of the extension plate 701. The top surface of the extension plate 701 is provided with a guide slot 702, and the inner wall of the guide slot 702 is provided with a T-shaped slot 703. A T-shaped slide rail 704 is slidably inserted into the T-shaped slot 703. A guide slider 705 is fixedly connected to the T-shaped slide rail 704. The top surface of the guide slider 705 is fixedly connected to the limiting slider 706. The side of the limiting slider 706 is fixedly connected to a fixed short shaft 707. The outer movably sleeve of the fixed short shaft 707 is provided with a rotating wheel 708. The buffer plate 504 is fixedly connected to a force vertical plate 709. It is fixedly connected to the end face of the upper mounting shell 302, and a force-applying inclined surface 710 is provided on the force-applying vertical plate 709 near the corner of the lower mounting shell 301. The rotating wheel 708 rolls on the force-applying inclined surface 710. A traction spring 711 is fixedly connected to the side of the limiting slider 706 away from the lower mounting shell 301, and the other end of the traction spring 711 is fixedly connected to a traction plate 712. The traction plate 712 is fixedly connected to the end of the mold base 601 and the end of the extension plate 701. A plug body 713 is fixedly connected to the other side of the limiting slider 706, and a sealing ring groove 714 is provided on the plug body 713. A sealing gasket 715 is embedded in the sealing ring groove 714, and a chamfered inclined surface 716 is provided on the side of the sealing gasket 715 close to the lower mounting shell 301.

[0040] It is used to insert the plug body 713 into the blank tube 200 to achieve the purpose of automatic sealing.

[0041] The plug body 713 is provided with a mounting hole 717 inside, and a thread is provided on the inner wall of the mounting hole 717. A threaded tube 718 is installed in the mounting hole 717 in cooperation with the thread. The end of the threaded tube 718 is fixedly connected to the limiting slider 706. A fixed cavity is provided inside the limiting slider 706, and the fixed cavity is communicated with the threaded tube 718. The radial depth of the sealing ring groove 714 is deeper than the depth of the conventional setting, and the radial thickness of the sealing gasket 715 is thicker than the thickness of the conventional setting. A plurality of constant pressure through holes 719 are provided on the inner wall of the mounting hole 717 at equal distances. The constant pressure through holes 719 are connected to the sealing ring groove 714. The end of the plug body 713 is fixedly connected to a guide frustum 720, and a channel hole connected to the mounting channel 717 is opened on the end surface of the guide frustum 720. A fixed cavity inside a limit slider 706 is fixedly connected to a booster pump 721 through a hose, and a pressure relief valve is fixedly connected to the hose. The booster pump 721 is electrically connected to the control box 105, and the booster pump 721 is fixedly installed on the surface of the water tank 101 and connected to the inner cavity of the water tank 101. The fixed cavity inside the other limit slider 706 is fixedly connected to an exhaust valve 722, and the exhaust valve 722 is fixedly installed on the top surface of the limit slider 706.

[0042] The sealing performance of the sealing gasket 715 is correlated with the water pressure; the greater the water pressure, the better the sealing performance.

[0043] See also Figure 4 and Figure 10 The pressure-maintaining mechanism 8 includes a pressure-maintaining rod 801 and a pressure-maintaining shell 803. One end of the pressure-maintaining rod 801 is fixedly connected to the bottom surface of the buffer plate 501, and the other end of the pressure-maintaining rod 801 passes through the buffer plate 504 and the mold bottom plate 601. A plurality of pressure-maintaining ring grooves 802 are equidistantly provided on the surface of the pressure-maintaining rod 801. The cross section of the pressure-maintaining ring groove 802 is a right-angled triangle. The pressure-maintaining shell 803 is fixedly connected to the bottom surface of the lower mounting shell 301. A guide sliding hole 804 is provided inside the pressure-maintaining shell 803. A pressure-maintaining cover plate 805 is bolted to one end of the pressure-maintaining shell 803. The pressure-maintaining cover plate 805 is connected to the pressure-maintaining shell 80 An electromagnet 806 and a spreading spring 807 are fixedly mounted on the contact surface. The electromagnet 806 is electrically connected to the control box 105. The other end of the spreading spring 807 is fixedly connected to a guide plate 808. The electromagnet 806, the spreading spring 807, and the guide plate 808 are all movably inserted into the guide slide hole 804. A strong magnetic plate 809 is fixedly connected to the side of the guide plate 808 near the electromagnet 806. The strong magnetic plate 809 is adapted to the electromagnet 806. A fixed chamfer 810 is provided on the end surface of the other end of the guide plate 808. The fixed chamfer 810 is adapted to the inclined surface inside the pressure retaining ring groove 802.

[0044] Limitations are imposed on the lower template assembly 2 and the upper template assembly 3 to ensure that the mold closing of the lower template assembly 2 and the upper template assembly 3 is stable.

[0045] A method for forming a slender strip-shaped special-shaped tubular component comprises the following steps: The first step is to place the first blank tube 200 in the blank tube groove 306; In the second step, the forming bracket 1 is used to control the action of the mold clamping hydraulic press 4. Then, the mold clamping hydraulic press 4 moves the upper template assembly 3 toward the lower template assembly 2 through the buffer mechanism 5. Then, the upper template assembly 3 and the lower template assembly 2 are clamped. At the same time, the upper template assembly 3 drives the plug assembly 7 to move. Then, the plug assembly 7 blocks the end of the blank tube 200. The pressure holding mechanism 8 fixes the clamping state between the upper template assembly 3 and the lower template assembly 2. Step 3: Use the forming bracket 1 to control the plug assembly 7, and then the plug assembly 7 fills the first billet tube 200 with high-pressure water. Then, use the forming bracket 1 to control the offset of the mold clamping hydraulic press 4 so that the mold clamping hydraulic press 4 is aligned with another upper template assembly 3. Then, the second billet tube 200 is loaded into the lower template assembly 2 corresponding to the upper template assembly 3 and subsequent operations are carried out. In the fourth step, the first blank tube 200 is plastically deformed under the action of water pressure and maintained under pressure for a period of time to complete the molding work. Then, the plug assembly 7 is controlled to release pressure through the molding bracket 1, and then the molding bracket 1 is used to control the pressure holding mechanism 8 to release. After that, the upper template assembly 3 is separated from the lower template assembly 2 under the elastic force of the mold opening mechanism 6, and then the molded blank tube 200 is taken out.

[0046] Working principle: First, the first billet tube 200 is placed in the billet tube groove 306 on a lower template assembly 2, and then the billet tube 200 is gradually immersed in water under the action of gravity, and then the inner cavity of the billet tube 200 is filled with water, which can reduce the time for subsequent water filling and help increase production efficiency. Then, the control box 105 is used to control the extension of the hydraulic cylinder 405, and then the hydraulic cylinder 405 pushes the corresponding buffer plate 501 to move downward, and then the buffer plate 501 moves downward with the buffer column 502 and the pressure holding rod 801, and then the inner wall of the pressure holding ring groove 802 applies a thrust to the fixed chamfer 810, and then the guide plate 808 is retracted into the guide slide hole 804 under the action of the thrust to ensure that the guide plate 808 does not prevent the movement of the pressure holding rod 801, and then the buffer plate 501 squeezes the buffer spring 503, the buffer spring 503 squeezes the buffer plate 504, and the buffer plate 504 squeezes the mold opening spring 602, and then the buffer spring 503 and the mold opening spring 602 are elastically shortened, After the cam 711 is pushed against the top of the mold 708, the cam 712 is released and the mold 708 is in a closed position. Then, the guide plate 808 is inserted into the pressure-retaining ring groove 802 under the action of the elastic force of the expansion spring 807. The pressure-retaining rod 801 is locked by the plugging action between the guide plate 808 and the pressure-retaining ring groove 802. Then, the buffer plate 501 fixes the mold closing state between the upper mold assembly 3 and the lower mold assembly 2 through the elastic force of the buffer spring 503, ensuring that the mold between the lower mold assembly 2 and the upper mold assembly 3 will not open after the hydraulic cylinder 405 is moved away. Then, the control box 105 is used to control the operation of the corresponding booster pump 721. After that, the booster pump 721 draws water from the water tank 101 and injects it into a fixed cavity inside a limit slider 706 through a hose. Then, the water inside this fixed cavity enters the blank tube 200 through the threaded tube 718, the installation channel 717, and the channel hole. Then, the water in the blank tube 200 enters the fixed cavity inside another limit slider 706 through another channel hole, the installation channel 717, and the threaded tube 718. When there is air, the air is discharged through the exhaust valve 722 under the pressure of the water. After that, the water pressure inside the blank tube 200 gradually increases, and then the water inside the installation channel 717 enters the annular cavity surrounded by the sealing gasket 715 and the inner wall of the sealing ring groove 714 through the constant pressure through hole 719. The water then exerts radial outward pressure on the sealing gasket 715 under the action of water pressure. The greater the water pressure, the greater the radial pressure and the better the sealing effect. The sealing gasket 715 then deforms radially and axially. The radial deformation increases the sealing force between the outer side of the sealing gasket 715 and the blank tube 200, resulting in a better sealing effect. The radial deformation also causes the chamfered inclined surface 716 to press against the inner wall of the blank tube 200, increasing the sealing surface and helping to further enhance the sealing effect. At the same time, the axial deformation increases the sealing force between the sealing gasket 715 and the inner wall of the sealing ring groove 714, helping to further enhance the sealing effect. The blank tube 200 then gradually deforms plastically under the action of water pressure until the blank tube 200 fits against the inner wall of the characteristic groove 307. The pressure is then maintained for a period of time to complete the molding process. After the booster pump 721 works, the control box 105 is used to control the hydraulic cylinder 405 to shorten, and then the hydraulic cylinder 405 is separated from the previous buffer plate 501, and then the hydraulic cylinder 405 is shortened to the shortest, and then the control box 105 is used to control the servo motor 404 to operate, and then the servo motor 404 drives the driving screw 403 to rotate, and then the closing mold plate 401 drives the hydraulic cylinder 405 to deviate to the top of another buffer plate 501 under the action of the threaded fit between the closing mold plate 401 and the driving screw 403, and then the control box 105 controls the servo motor 404 to stop, and then the second blank tube 200 is loaded into the blank tube groove 306 on the other lower mold plate assembly 2, and then the mold closing operation is carried out according to the above principle, and then the control box 105 is used to control the operation of the other booster pump 721, and then the operation is carried out according to the above principle; Then the first billet tube 200 is formed, and then the control box 105 controls the pressure relief valve to open. Then, under the action of water pressure, the water inside the billet tube 200 flows into the water tank 101 through the channel hole, the installation hole 717, the threaded tube 718, the fixed cavity, the hose, and the pressure relief valve. Then, the pressure inside the billet tube 200 decreases until the pressure is completely released. Then, the force on the sealing gasket 715 disappears, and then the sealing gasket 715 elastically recovers and contracts in the radial and axial directions. Then, the pressure between the sealing gasket 715 and the inner wall of the billet tube 200 decreases sharply, and the friction force decreases sharply. Then, the control box 105 is used to control the electromagnet 806 to be energized, and then the electromagnet 806 applies magnetic attraction to the strong magnetic plate 809. Then the strong magnetic plate 809 moves with the guide plate 808 into the guide slide hole 804. Then, the guide plate 808 It is pulled out from the pressure-maintaining ring groove 802, and then the pressure-maintaining rod 801 is released, and then the buffer plate 501 moves upward under the elastic force of the buffer spring 503, and the buffer plate 504 moves upward under the elastic force of the mold opening spring 602, and then the buffer plate 504 moves upward with the upper template assembly 3 through the force-applying vertical plate 709, and then the force-applying inclined surface 710 moves upward, and then the limiting slider 706 is pulled out of the blank tube 200 with the plug body 713 under the elastic tension of the traction spring 711 and gradually moves away from the blank tube 200 until the stop cap contacts the mold opening bottom plate 601. At this time, the buffer plate 501 and the plug body 713 are reset, and then the blank tube 200 that has been formed is taken out, and then the third blank tube 200 is taken out and loaded into the empty blank tube groove 306, and then the above principle is repeated.

[0047] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative; within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0048] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A forming device for a slender, strip-shaped, special-shaped tubular component, comprising: The forming bracket (1) is characterized in that the forming bracket (1) comprises a water tank (101), the top of the water tank (101) is open, the inside of the water tank (101) is filled with water, two U-shaped arm plates (102) are fixedly installed on the top surface of the water tank (101) and are respectively located at both ends thereof, a mold clamping hydraulic press (4) is fixedly installed between the two U-shaped arm plates (102), two upper template assemblies (3) are provided below the mold clamping hydraulic press (4), two lower template assemblies (2) are provided below the upper template assemblies (3), and a support plate (103) and a fixed platform are fixedly installed below the lower template assembly (2). (104), the support plate (103) and the fixed platform (104) are fixedly connected to the bottom surface of the inner cavity of the water tank (101), the two lower template assemblies (2) are aligned one by one with the two upper template assemblies (3), the top of the upper template assembly (3) is fixedly installed with a buffer mechanism (5), the mold opening mechanism (6) and the plug assembly (7) are fixedly installed between the mutually aligned lower template assembly (2) and the upper template assembly (3), the pressure holding mechanism (8) is fixedly installed between the buffer mechanism (5) and the mold opening mechanism (6), and a control box (105) is fixedly installed on a U-shaped arm plate (102).

2. The forming device of a slender strip-shaped special-shaped tubular component according to claim 1, characterized in that: The lower template assembly (2) includes a lower mounting shell (301), and the upper template assembly (3) includes an upper mounting shell (302). The two ends of the lower mounting shell (301) and the upper mounting shell (302) close to each other are open. The ends of the lower mounting shell (301) and the upper mounting shell (302) facing the outside of the water tank (101) are open. The lower mounting shell (301) and the upper mounting shell (302) are both slidably connected with a template body (303). The ends of the template body (303) are A T-shaped groove (304) is provided on the surface, a T-shaped rail (305) is slidably inserted into the interior of the T-shaped groove (304), the T-shaped rail (305) is fixedly connected to the inner walls of the lower mounting shell (301) and the upper mounting shell (302), a blank tube groove (306) is provided on both sides of the two template bodies (303) close to each other, a characteristic groove (307) is provided on the inner wall of the blank tube groove (306), a blank tube (200) is filled in the blank tube groove (306), and the blank tube (200) is immersed in water; Electromagnetic telescopic rods (308) are fixedly mounted on both sides of the lower mounting shell (301) and the upper mounting shell (302) away from the template body (303). The electromagnetic telescopic rods (308) are electrically connected to the control box (105). Fixed through-holes (309) are provided on the lower mounting shell (301) and the upper mounting shell (302). The extension rods in the electromagnetic telescopic rods (308) are movably inserted into the fixed through-holes (309). The end faces of the extension rods are flush with the inner wall of the blank tube groove (306).

3. The forming device of a slender strip-shaped special-shaped tubular component according to claim 2, characterized in that: The lower mounting shell (301) and the upper mounting shell (302) are both fixedly mounted with a fixing cylinder (310) on both sides away from the template body (303), and a locking bolt (311) is threadedly mounted on the end surface of the fixing cylinder (310), and the locking bolt (311) passes through the fixing cylinder (310), and one end of the locking bolt (311) is fixedly connected to an operating cap (312), and the other end of the locking bolt (311) is fixedly connected to a locking frustum (313), and the locking frustum (313) can enter the fixing cylinder (310), and a frustum-shaped groove (314) is provided on the lower mounting shell (301) and the upper mounting shell (302), and the small diameter end of the frustum-shaped groove (314) extends to the interior of the template body (303), and the locking frustum (313) is adapted to the frustum-shaped groove (314).

4. The forming device for a slender strip-shaped special-shaped tubular component according to claim 3, characterized in that: The mold clamping hydraulic device (4) includes a mold clamping plate (401), the mold clamping plate (401) is located between two U-shaped arm plates (102), a mold clamping slide rod (402) is slidably inserted on the mold clamping plate (401), and the two ends of the mold clamping slide rod (402) are respectively fixedly connected to the two U-shaped arm plates (102), and a driving screw rod (403) is installed on the mold clamping plate (401) in a threaded manner, and the two ends of the driving screw rod (403) are respectively fixedly connected to the two U-shaped arm plates (102), and a servo motor ( 404), the servo motor (404) is bolted on a U-shaped arm plate (102), the servo motor (404) is electrically connected to the control box (105), and the hydraulic cylinder (405) located in the middle thereof is bolted on the closing template (401), the hydraulic cylinder (405) is connected to the hydraulic system of the peripheral device and is controlled by the control box (105), the telescopic column inside the hydraulic cylinder (405) passes through the closing template (401), and a pressure sensor is fixedly installed on the end surface of the telescopic column, and the pressure sensor is connected to the control box (105) for transmission.

5. The forming device for a slender strip-shaped special-shaped tubular component according to claim 4, characterized in that: The buffer mechanism (5) includes a buffer plate (501), the buffer plate (501) is located between the two U-shaped arm plates (102) and below the closing plate (401), the buffer plate (501) is adapted to the hydraulic cylinder (405), the surface of the buffer plate (501) away from the closing plate (401) is fixedly connected to a buffer column (502) located at its end, the outside of the buffer column (502) is movably sleeved with a buffer spring (503), one end of the buffer spring (503) is fixedly connected to the surface of the buffer plate (501), the other end of the buffer spring (503) is fixedly connected to a buffer small plate (504), the buffer small plate (504) is slidably sleeved on the outside of the buffer column (502) and is transmission-connected to the upper mounting shell (302).

6. The forming device for a slender strip-shaped special-shaped tubular component according to claim 5, characterized in that: The mold opening mechanism (6) comprises a mold opening base plate (601), the mold opening base plate (601) is connected to the end of the lower mounting shell (301), a mold opening spring (602) is fixedly connected to the top surface of the mold opening base plate (601), the top end of the mold opening spring (602) is fixedly connected to the surface of the buffer plate (504), the buffer column (502) is movably plugged into the mold opening base plate (601), and a blocking cap is fixedly connected to the end of the buffer column (502).

7. The forming device for a slender strip-shaped special-shaped tubular component according to claim 6, characterized in that: The plug assembly (7) comprises two extension plates (701), the two extension plates (701) are respectively fixedly connected to the two end surfaces of the lower mounting shell (301), the mold base (601) is connected to the end of the extension plate (701), the top surface of the extension plate (701) is provided with a guide slot (702), the inner wall of the guide slot (702) is provided with a T-shaped slot (703), the interior of the T-shaped slot (703) is slidably plugged with a T-shaped slide rail (704), the T-shaped slide rail (704) is fixedly connected with a guide slider (705), the top surface of the guide slider (705) is fixedly connected with a limit slider (706), the side surface of the limit slider (706) is fixedly connected with a fixed short shaft (707), the outer movably sleeve of the fixed short shaft (707) is provided with a rotating wheel (708), the buffer plate (504) is fixedly connected with a force vertical plate (709), the force vertical plate (709) is connected to the buffer plate (504), and the force vertical plate (709) is connected to the buffer plate (504). The end face of the upper mounting shell (302) is fixedly connected, a force-applying inclined surface (710) is provided on the force-applying vertical plate (709) at a corner close to the lower mounting shell (301), the rotating wheel (708) rolls on the force-applying inclined surface (710), a traction spring (711) is fixedly connected to the side of the limiting slider (706) away from the lower mounting shell (301), the other end of the traction spring (711) is fixedly connected to a traction plate (712), the traction plate (712) is fixedly connected to the end of the mold base (601) and the end of the extension plate (701), a plug body (713) is fixedly connected to the other side of the limiting slider (706), a sealing ring groove (714) is provided on the plug body (713), a sealing gasket (715) is embedded in the sealing ring groove (714), and a chamfered inclined surface (716) is provided on the side of the sealing gasket (715) close to the lower mounting shell (301).

8. The forming device for a slender strip-shaped special-shaped tubular component according to claim 7, characterized in that: The plug body (713) is provided with a mounting hole (717) inside, and a thread is provided on the inner wall of the mounting hole (717). A threaded tube (718) is installed in the mounting hole (717) in conjunction with the thread. The end of the threaded tube (718) is fixedly connected to the limit slider (706). The limit slider (706) is provided with a fixed cavity inside, and the fixed cavity is communicated with the threaded tube (718). A plurality of constant pressure through holes (719) are provided on the inner wall of the mounting hole (717) at equal distances. The constant pressure through holes (719) are communicated with the sealing ring groove (714). The end of the plug body (713) is fixedly connected to a guide cone ( 720), a channel hole communicating with the mounting hole (717) is opened on the end surface of the guide frustum (720), a fixed cavity inside one limit slider (706) is fixedly connected to a booster pump (721) through a hose, a pressure relief valve is fixedly connected to the hose, the booster pump (721) is electrically connected to the control box (105), the booster pump (721) is fixedly mounted on the surface of the water tank (101) and communicated with the inner cavity of the water tank (101), and the fixed cavity inside the other limit slider (706) is fixedly connected to an exhaust valve (722), and the exhaust valve (722) is fixedly mounted on the top surface of the limit slider (706).

9. The forming device for a slender strip-shaped special-shaped tubular component according to claim 6, characterized in that: The pressure-maintaining mechanism (8) comprises a pressure-maintaining rod (801) and a pressure-maintaining shell (803), one end of the pressure-maintaining rod (801) is fixedly connected to the bottom surface of the buffer plate (501), the other end of the pressure-maintaining rod (801) passes through the buffer plate (504) and the mold base (601), a plurality of pressure-maintaining ring grooves (802) are equidistantly provided on the surface of the pressure-maintaining rod (801), the cross section of the pressure-maintaining ring grooves (802) is a right-angled triangle, the pressure-maintaining shell (803) is fixedly connected to the bottom surface of the lower mounting shell (301), a guide sliding hole (804) is provided inside the pressure-maintaining shell (803), a pressure-maintaining cover plate (805) is bolted to one end of the pressure-maintaining shell (803), and the pressure-maintaining cover plate (805) and the pressure-maintaining shell (803) are connected to each other. ) is fixedly mounted on the contact surface with an electromagnet (806) and a stretching spring (807), the electromagnet (806) is electrically connected to the control box (105), the other end of the stretching spring (807) is fixedly connected to a guide plate (808), the electromagnet (806), the stretching spring (807), and the guide plate (808) are all movably plugged into the inside of the guide slide hole (804), the side of the guide plate (808) close to the electromagnet (806) is fixedly connected to a strong magnetic plate (809), the strong magnetic plate (809) is adapted to the electromagnet (806), and a fixed chamfer (810) is provided on the end face of the other end of the guide plate (808), and the fixed chamfer (810) is adapted to the inclined surface on the inner side of the pressure retaining ring groove (802).

10. A method for forming a slender strip-shaped special-shaped tubular component, using the slender strip-shaped special-shaped tubular component forming device according to claim 9, characterized in that: The following steps are included: The first step is to place the first blank tube (200) in the blank tube groove (306); The second step is to use the forming bracket (1) to control the action of the mold clamping hydraulic press (4), and then the mold clamping hydraulic press (4) moves the upper template assembly (3) toward the lower template assembly (2) through the buffer mechanism (5), and then the upper template assembly (3) and the lower template assembly (2) are clamped, and at the same time, the upper template assembly (3) drives the plug assembly (7) to move, and then the plug assembly (7) blocks the end of the blank tube (200), and the pressure holding mechanism (8) fixes the clamping state between the upper template assembly (3) and the lower template assembly (2); Step 3: Use the forming bracket (1) to control the plug assembly (7), and then use the plug assembly (7) to fill the first blank tube (200) with high-pressure water. Then use the forming bracket (1) to control the offset of the mold clamping hydraulic press (4) so ​​that the mold clamping hydraulic press (4) is aligned with another upper template assembly (3). Then, fill the second blank tube (200) into the lower template assembly (2) corresponding to the upper template assembly (3) and perform subsequent operations. In the fourth step, the first blank tube (200) is plastically deformed under the action of water pressure, and the pressure is maintained for a period of time to complete the molding work. Then, the plug assembly (7) is controlled to release the pressure through the molding bracket (1), and then the molding bracket (1) is used to control the pressure holding mechanism (8) to release. After that, the upper template assembly (3) is separated from the lower template assembly (2) under the elastic force of the mold opening mechanism (6), and then the molded blank tube (200) is taken out.

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