A positioning and material-removing device for a water swelling forming die

Abstract

The present invention discloses a positioning and material-removing device for a water-expansion forming mold, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are respectively mounted on an upper mold base and a lower mold base, wherein an upper guide rod is slidably arranged in an upper slideway of the upper mold base, a top insert is fixed at the top of the upper slideway, a slide rod is arranged at the bottom of the top insert, the top of the upper guide rod is slidably sleeved on the slide rod, and the upper guide rod is pressed against a limiting boss at the bottom of the slide rod by an upper spring; a lower guide rod is slidably arranged in a lower slideway of the lower mold base, a bottom insert is fixed at the bottom of the lower slideway, and the bottom of the lower guide rod is elastically supported above the bottom insert by a lower spring; a section of positioning cone surface is also arranged on the outer wall of the lower guide rod, and a limiting movable component is arranged in the mounting groove of the lower mold base, and the limiting movable component is pushed to move radially by a positioning drive mechanism to realize pressing or disengaging the positioning cone surface of the lower guide rod. The advantages of the present invention are: ensuring that the workpieces after expansion are uniformly placed on the lower mold, so that the manipulator can accurately grab and discharge materials at a fixed position.

Description

Technical Field

[0001] The invention relates to a forming die, in particular to a positioning and material-removing device for a water swelling forming die. Background Art

[0002] The existing water expansion forming mold required for making containers from steel pipes has the upper and lower ends of the workpiece clamped on the upper die seat and the lower die seat respectively during expansion. After the expansion is completed, when the upper die moves upward during mold opening, the workpiece is easily carried upward by the upper die, resulting in the robot arm being unable to correctly grab the blank. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a water expansion forming mold positioning and material removal device to ensure that the expanded workpieces are uniformly placed on the lower mold so that a robot can accurately grab and remove the material at a fixed position.

[0004] The present invention is achieved through the following technical solutions:

[0005] A positioning and material-removing device for a water swelling forming die comprises an upper die and a lower die, wherein the top of the upper die is mounted on an upper die seat, and the bottom of the lower die is mounted on a lower die seat.

[0006] The center of the upper mold base is provided with an upper slideway extending vertically, an upper guide rod is slidably arranged in the upper slideway, the top end of the upper guide rod is suspended on a vertical slide rod and can slide up and down along the slide rod, and in a natural state, the upper guide rod is pressed downward by the upper elastic component so that the upper guide rod is located at the lower limit position; the bottom of the upper guide rod is connected to an upper guide column, and the upper guide column extends vertically downward to the upper cavity in the center of the upper mold;

[0007] A vertically extending lower slide is provided at the center of the lower die seat, a lower guide rod is slidably arranged in the lower slide, the bottom of the lower guide rod is elastically supported on the lower elastic component, the top of the lower guide rod is connected to a lower guide column, and the lower guide column vertically extends upward into the lower cavity at the center of the lower die;

[0008] A positioning portion is also provided on the outer wall of the lower guide rod, and an installation groove that penetrates inside and outside is opened on one side of the lower mold base. A limiting movable component is provided in the installation groove, and the inner end surface of the limiting movable component is consistent with the positioning portion of the lower guide rod. The limiting movable component is pushed to move radially by the positioning drive mechanism to achieve the tightening or disengagement of the positioning portion of the lower guide rod. When the limiting movable component is pressed against the positioning portion of the lower guide rod, the vertical movement of the lower guide rod is limited.

[0009] Furthermore, the upper elastic component includes an upper spring, a top insert is fixed on the top of the upper slideway, a slide rod is connected to the bottom of the top insert, the top of the upper guide rod is slidably sleeved on the slide rod, and the upper guide rod is pressed against the limiting boss at the bottom of the slide rod through the upper spring;

[0010] The lower elastic component comprises a lower spring, a bottom insert is fixed to the bottom of the lower slide, and the bottom of the lower guide rod is elastically supported above the bottom insert by the lower spring.

[0011] Furthermore, the limiting movable component is divided into two sections, an inner section and an outer section. The cross-sectional area of ​​the inner section of the limiting movable component is larger than the cross-sectional area of ​​the outer section. A limiting step is formed at the junction of the inner section and the outer section of the limiting movable component. The mounting groove of the lower mold base is provided with a limiting step surface that matches the limiting step of the limiting movable component.

[0012] Furthermore, the positioning portion of the lower guide rod is a concave cone surface.

[0013] Furthermore, an upper water expansion cone is provided on the outer wall of the upper guide rod, and an upper water expansion block and an upper tightening sleeve are sequentially mounted on the outer periphery of the upper guide rod corresponding to the upper water expansion cone from the inside to the outside. When expanded, the inner wall of the upper water expansion block coincides with the upper water expansion cone, and an upper clamping gap for clamping the upper end of the workpiece is formed between the upper tightening sleeve and the upper water expansion block; a lower water expansion cone is provided on the outer wall of the lower guide rod, and a lower water expansion block and a lower tightening sleeve are sequentially mounted on the outer periphery of the lower guide rod corresponding to the lower water expansion cone from the inside to the outside. When expanded, the inner wall of the lower water expansion block coincides with the lower water expansion cone, and a lower clamping gap for clamping the lower end of the workpiece is formed between the lower tightening sleeve and the lower water expansion block.

[0014] Furthermore, an upper clamping ring protruding inward is provided on the inner wall of the upper tightening sleeve, and the upper tightening sleeve is clamped into the upper clamping groove on the outer wall of the upper water expansion block through the upper clamping ring; a lower clamping ring protruding inward is provided on the inner wall of the lower tightening sleeve, and the lower tightening sleeve is clamped into the lower clamping groove on the outer wall of the lower water expansion block through the lower clamping ring.

[0015] Furthermore, the top of the upper guide rod is pressed against the bottom of the upper spring through an upper water sealing block, and the bottom of the lower guide rod is pressed against the top of the lower spring through a lower water sealing block.

[0016] Furthermore, an upper fixed sleeve is sleeved on the periphery of the upper section of the upper guide rod, and the lower limit position of the movement of the upper water sealing block is limited by the top of the upper fixed sleeve; a lower fixed sleeve is sleeved on the periphery of the lower section of the lower guide rod, and the upper limit position of the movement of the lower water sealing block is limited by the bottom of the lower fixed sleeve.

[0017] Furthermore, a first water sealing block is provided on the top of the upper water expansion block, and the first water sealing block is movably mounted outside the upper guide rod. A second water sealing block is provided on the bottom of the lower water expansion block, and the second water sealing block is movably mounted outside the lower guide rod.

[0018] Furthermore, the positioning drive mechanism is a cylinder, and the piston rod of the cylinder pushes the limiting movable component to move radially.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention provides a positioning and material-removing device for a water-expansion forming mold, which is provided with a positioning portion on the outer wall of the lower guide rod, and a limit movable component is provided in the installation of the lower die seat, and the inner end face of the limit movable component is matched with the positioning portion of the lower guide rod, and the limit movable component is pushed to move radially by the positioning drive mechanism, so that the inner end face of the limit movable component and the positioning portion can be pressed or disengaged, thereby realizing the locking or loosening of the lower guide rod. During the entire process of mold closing and mold opening, the lower guide rod is locked by the limit movable component, so that the lower guide rod will not move upward, so that the lower water expansion block is always in an expanded state, and the lower clamping gap between the lower expansion sleeve and the lower water expansion block always clamps the lower end of the workpiece, so as to avoid the workpiece from moving upward with the upper die during the mold opening process, and ensure that the workpiece is always placed on the lower die during the mold opening process, so that the manipulator can accurately grab the material at a fixed position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective view of the present invention.

[0022] Figure 2 It is a three-dimensional cross-sectional view of the present invention.

[0023] Figure 3 It is a front cross-sectional view of the upper die base and the upper die part of the present invention.

[0024] Figure 4 It is a three-dimensional cross-sectional view of the upper die base and the upper die part of the present invention.

[0025] Figure 5 It is a front cross-sectional view of the lower die base and the lower die part of the present invention.

[0026] Figure 6 It is a three-dimensional cross-sectional view of the lower die base and the lower die part of the present invention.

[0027] Figure 7 It is a three-dimensional diagram of the cylinder and the lower die base of the present invention.

[0028] Figure 8 yes Figure 7 Cross-sectional view of .

[0029] Fig. 9 It is an exploded view of the position limiting movable component, the lower guide rod and the lower fixed sleeve of the present invention.

[0030] Fig.10 It is a three-dimensional image of a single petal.

[0031] Numbers in the figure: 1 upper die, 2 lower die, 3 upper die seat, 4 lower die seat, 5 upper guide rod, 6 top insert, 7 slide rod, 8 upper spring, 9 upper water sealing block, 10 upper fixed sleeve, 11 upper guide column, 12 upper water swelling block, 13 upper tightening jacket, 14 upper retaining ring, 15 first water sealing block, 16 lower guide rod, 17 bottom insert, 18 lower spring, 19 lower water sealing block, 20 lower fixed sleeve, 21 lower guide column, 22 lower water swelling block, 23 lower tightening jacket, 24 lower retaining ring, 25 second water sealing block, 26 swelling petals, 27 swelling petals wrapped with tendons, 28 positioning part, 29 mounting groove, 30 limiting movable part, 31 cylinder, 32 limiting step, 33 limiting step surface, 34 upper pressure plate, 35 lower pressure plate, 36 lower water swelling cone surface. DETAILED DESCRIPTION

[0032] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0033] See also Figures 1 to 10 This embodiment discloses a water swelling forming mold positioning and material removal device, including an upper mold 1 and a lower mold 2. The top of the upper mold 1 is fixedly mounted on the upper mold base 3 through an upper pressure plate 34, and the bottom of the lower mold 2 is fixedly mounted on the lower mold base 4 through a lower pressure plate 35.

[0034] A vertically extending upper slide is opened in the center of the upper mold base 3, and an upper guide rod 5 is slidably arranged in the upper slide. A top insert 6 is fixed on the top of the upper slide, and a slide rod 7 extending vertically downward is arranged at the bottom of the top insert 6. The top of the upper guide rod 5 is slidably sleeved on the slide rod 7, and the upper guide rod 5 is pressed against the limiting boss at the bottom of the slide rod 7 through the upper spring 8. The top of the upper guide rod 5 is pressed against the bottom of the upper spring 8 through the upper water sealing block 9. An upper fixed sleeve 10 is sleeved on the outer periphery of the upper section of the upper guide rod 5, and the lower limit position of the movement of the upper water sealing block 9 is limited by the top of the upper fixed sleeve 10.

[0035] The upper guide post 11 is connected to the bottom of the upper guide rod 5, and the upper guide post 11 extends vertically downward to the upper cavity in the center of the upper mold 1. A section of upper water expansion cone is provided on the outer wall of the upper guide rod 5, and an upper water expansion block 12 and an upper tightening sleeve 13 are sequentially mounted on the outer periphery of the upper water expansion cone from the inside to the outside of the upper guide rod 5 corresponding to the upper water expansion cone. When expanding, the inner wall of the upper water expansion block 12 coincides with the upper water expansion cone, and an upper clamping gap for clamping the upper end of the workpiece is formed between the upper tightening sleeve 13 and the upper water expansion block 12. Since the inner wall of the upper water expansion block 12 coincides with the upper water expansion cone, the vertical movement of the upper guide rod 5 will be converted into the horizontal movement of the upper water expansion block 12, so that the upper water expansion block 12 expands radially outward. The inner wall of the upper tightening sleeve 13 is provided with an upper clamping ring 14 protruding inward, and the upper tightening sleeve 13 is clamped into the upper clamping groove of the outer wall of the upper water expansion block 12 through the upper clamping ring 14. Through the cooperation between the upper clamping ring 14 and the upper clamping groove, the upper water expansion block 12 can only expand or contract radially, and cannot move axially. A first water sealing block 15 is provided on the top of the upper water expansion block 12, and the first water sealing block 15 is movably sleeved outside the upper guide rod 5.

[0036] A vertically extending lower slide is provided in the center of the lower die base 4, a lower guide rod 16 is slidably arranged in the lower slide, a bottom insert 17 is fixed at the bottom of the lower slide, the bottom of the lower guide rod 16 is elastically supported above the bottom insert 17 by a lower spring 18, and the bottom of the lower guide rod 16 is pressed against the top of the lower spring 18 by a lower water-sealing block 19. A lower fixed sleeve 20 is sleeved on the periphery of the lower section of the lower guide rod 16, and the upper limit position of the movement of the lower water-sealing block 19 is limited by the bottom of the lower fixed sleeve 20.

[0037] The top of the lower guide rod 16 is connected to a lower guide column 21, which extends vertically upward into the lower cavity at the center of the lower mold 2. A lower water expansion cone 36 is provided on the outer wall of the lower guide rod 16, and the lower guide rod 16 is sequentially provided with a lower water expansion block 22 and a lower tightening sleeve 23 from the inside to the outside on the outer periphery of the corresponding lower water expansion cone 36. When the lower water expansion block 22 is expanded, the inner wall of the lower water expansion block 22 coincides with the lower water expansion cone 36, and a lower clamping gap for clamping the lower end of the workpiece is formed between the lower tightening sleeve 23 and the lower water expansion block 22. The inner wall of the lower tightening sleeve 23 is provided with a lower clamping ring 24 protruding inwardly, and the lower tightening sleeve 23 is clamped into the lower clamping groove of the outer wall of the lower water expansion block 22 through the lower clamping ring 24. Through the cooperation of the lower clamping ring 24 and the lower clamping groove, the lower water expansion block 22 can only expand radially or contract radially, and cannot move axially. A second water sealing block 25 is provided at the bottom of the lower water expansion block 22 , and the second water sealing block 25 is movably sleeved outside the lower guide rod 16 .

[0038] The upper water expansion block 12 and the lower water expansion block 22 are both surrounded by a plurality of expansion petals 26 uniformly distributed along the circumferential direction, and the plurality of expansion petals 26 are sheathed together by wrapping beef tendons 27 around the expansion petals.

[0039] A positioning portion 28 is also provided on the outer wall of the lower guide rod 16. A mounting groove 29 that penetrates inside and outside is opened on one side of the lower die base 4. A position-limiting movable component 30 is provided in the mounting groove 29. The inner end surface of the position-limiting movable component 30 passes through the lower fixed sleeve 20 and matches with the positioning portion 28 of the lower guide rod 16. The position-limiting movable component 30 is pushed to move radially by the positioning drive mechanism to achieve the tightening or disengagement of the positioning portion 28 of the lower guide rod 16. When the position-limiting movable component 30 is tightened against the positioning portion 28 of the lower guide rod 16, the vertical movement of the lower guide rod 16 is limited. In this embodiment, the positioning drive mechanism uses a cylinder 31, and the piston rod of the cylinder 31 pushes the position-limiting movable component 30 to move radially.

[0040] Among them, the positioning portion 28 can adopt one of the conical surface structure, the inclined surface structure, and the positioning groove structure. In this embodiment, the positioning portion 28 adopts an inwardly conical surface structure, and the limiting movable component 30 is divided into an inner and outer section. The cross-sectional area of ​​the inner section of the limiting movable component 30 is larger than the cross-sectional area of ​​the outer section. A limiting step 32 is formed at the junction of the inner section and the outer section of the limiting movable component 30, and a limiting step surface 33 matching the limiting step 32 of the limiting movable component 30 is provided on the installation groove 29 of the lower mold base 4.

[0041] When in use, the water expansion forming mold is installed on the water expansion machine, the upper die seat 3 is installed on the bottom of the upper platen of the water expansion machine, and the lower die seat 4 is installed on the lower platen of the water expansion machine. The blank before water expansion forming is called a tube blank, and the tube blank after water expansion forming is called a workpiece.

[0042] The working process of this embodiment is as follows:

[0043] A. Loading:

[0044] The tube blank is placed downward along the annular space between the lower guide rod 16 and the lower die 2, so that the lower end of the tube blank is inserted into the gap between the lower tightening sleeve 23 and the lower water expansion block 22, and is guided by the lower guide rod 16 to complete the loading.

[0045] B. Mould closing:

[0046] Then the upper platen of the water expansion machine moves downward, driving the upper die seat 3 and part of the upper die 1 to move downward together, realizing the mold closing between the upper die 1 and the lower die 2. In this process, the upper guide pillar 11 and the lower guide pillar 21 first contact each other. As the upper platen continues to move downward, the upper guide pillar 11 and the lower guide pillar 21 are subjected to force, so that the upper guide pillar 11 and the upper guide rod 5 move upward synchronously for a certain distance, and the lower guide pillar 21 and the lower guide rod 16 move downward synchronously for a certain distance. At this time, the upper spring 8 and the lower spring 18 are compressed respectively. The upper water expansion cone surface of the upper guide rod 5 moves upward, which will expand the upper water expansion block 12 radially outward, thereby clamping the upper end of the tube blank in the upper clamping gap between the upper tightening sleeve 13 and the upper water expansion block 12; in the same principle, the lower end of the tube blank is clamped in the lower clamping gap between the lower tightening sleeve 23 and the lower water expansion block 22. At this time, the upper cavity of the upper die 1 and the lower cavity of the lower die 2 are closed, and the mold closing is completed.

[0047] C. Lock the lower guide rod 16:

[0048] The piston rod of the control cylinder 31 extends to push the limit movable component 30 to move radially inward, so that the inner end surface of the limit movable component 30 fits with the positioning portion 28 of the lower guide rod 16, and the tapered surface locks the lower guide rod 16 so that the lower guide rod 16 will not move upward.

[0049] D. Water swelling molding:

[0050] When the high-pressure water supply system of the water expansion machine works, high-pressure water enters the cavity of the lower guide column 21 through the center hole of the bottom insert 17, the lower water sealing block 19, and the lower guide rod 16 in sequence, and enters the tube blank through the opening on the side of the lower guide column 21. Since the upper and lower ends of the tube blank are clamped and the high-pressure water is sealed, the tube blank is forced to deform in the water expansion cavity composed of the upper cavity and the lower cavity, and the water expansion molding is completed after the expansion requirements of the water expansion process are met.

[0051] E. Mold opening

[0052] After the high-pressure water supply system of the water expansion machine has finished working and the high-pressure water is depressurized, the upper table of the water expansion machine moves upward, driving the upper mold base 3 and part of the upper mold 1 to move upward synchronously, and the upper and lower molds 2 are separated. At this time, the upper guide rod 5 moves downward and resets under the action of the upper spring 8, and the upper water expansion block 12 is tightened inwardly under the action of the expansion petal tightening tendon 27, so that the upper water expansion block 12 is disengaged from the clamped upper end of the workpiece; and for the lower mold 2, due to the locking of the limit movable component 30, the lower guide rod 16 will not move upward. At this time, the lower water expansion block 22 is still in an expanded state, and the lower end of the workpiece is still clamped between the lower tightening sleeve 23 and the lower water expansion block 22. Therefore, the workpiece will not be moved up together with the upper mold 1, ensuring that the workpiece is always in the lower mold 2 during the mold opening process.

[0053] E. Cutting

[0054] After the mold is opened, the piston rod of the control cylinder 31 is retracted to release the lock on the lower guide rod 16. At this time, the lower guide rod 16 moves up and resets under the action of the lower spring 18, and the lower water expansion block 22 is tightened inward under the action of the expansion petal tightening tendon 27, so that the lower water expansion block 22 is disengaged from the clamped lower end of the workpiece. Then the manipulator grabs the workpiece on the lower mold 2 for unloading.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for positioning and withdrawing a water swelling forming die, comprising an upper die (1) and a lower die (2), wherein the top of the upper die (1) is mounted on an upper die base (3), and the bottom of the lower die (2) is mounted on a lower die base (4), characterized in that: The center of the upper mold base (3) is provided with an upper slideway extending vertically, and an upper guide rod (5) is slidably arranged in the upper slideway. The top end of the upper guide rod (5) is suspended on a vertical slide rod (7) and can slide up and down along the slide rod (7). In a natural state, the upper guide rod (5) is pressed downward by an upper elastic component so that the upper guide rod (5) is located at the lower limit position; the bottom of the upper guide rod (5) is connected to an upper guide column (11), and the upper guide column (11) extends vertically downward to the upper cavity in the center of the upper mold (1); A vertically extending lower slide is provided at the center of the lower mold base (4), a lower guide rod (16) is slidably arranged in the lower slide, the bottom of the lower guide rod (16) is elastically supported on a lower elastic component, the top of the lower guide rod (16) is connected to a lower guide column (21), and the lower guide column (21) extends vertically upward into the lower mold cavity at the center of the lower mold (2); The outer wall of the lower guide rod (16) is also provided with a positioning portion (28); one side of the lower die base (4) is provided with an installation groove (29) which is through-and-through; a limit movable component (30) is provided in the installation groove (29); the inner end surface of the limit movable component (30) is matched with the positioning portion (28) of the lower guide rod (16); the limit movable component (30) is pushed to move radially by the positioning drive mechanism to achieve the pressing or disengagement of the positioning portion (28) of the lower guide rod (16); when the limit movable component (30) is pressed against the positioning portion (28) of the lower guide rod (16), the vertical movement of the lower guide rod (16) is limited; The upper guide rod (5) is provided with an upper water expansion cone on its outer wall, and an upper water expansion block (12) and an upper tightening sleeve (13) are sequentially mounted on the outer periphery of the upper water expansion cone from the inside to the outside of the upper guide rod (5), and the inner wall of the upper water expansion block (12) matches the upper water expansion cone when expanded, and an upper clamping gap for clamping the upper end of the workpiece is formed between the upper tightening sleeve (13) and the upper water expansion block (12); the lower guide rod (16) is provided with a lower water expansion cone on its outer wall, and a lower water expansion block (22) and a lower tightening sleeve (23) are sequentially mounted on the outer periphery of the lower water expansion cone (36) from the inside to the outside of the lower guide rod (16), and the inner wall of the lower water expansion block (22) matches the lower water expansion cone when expanded, and a lower clamping gap for clamping the lower end of the workpiece is formed between the lower tightening sleeve (23) and the lower water expansion block (22); The inner wall of the upper tightening sleeve (13) is provided with an upper clamping ring (14) protruding inwards, and the upper tightening sleeve (13) is clamped into the upper clamping groove of the outer wall of the upper water expansion block (12) through the upper clamping ring (14); the inner wall of the lower tightening sleeve (23) is provided with a lower clamping ring (24) protruding inwards, and the lower tightening sleeve (23) is clamped into the lower clamping groove of the outer wall of the lower water expansion block (22) through the lower clamping ring (24).

2. A positioning and material-removing device for a water swelling forming die as claimed in claim 1, characterized in that: The upper elastic component comprises an upper spring (8), a top insert (6) is fixed on the top of the upper slideway, a slide bar (7) is connected to the bottom of the top insert (6), the top of the upper guide bar (5) is slidably sleeved on the slide bar (7), and the upper guide bar (5) is pressed against the limiting boss at the bottom of the slide bar (7) through the upper spring (8); The lower elastic component comprises a lower spring (18), a bottom insert (17) is fixed at the bottom of the lower slide, and the bottom of the lower guide rod (16) is elastically supported above the bottom insert (17) by the lower spring (18).

3. A positioning and material-removing device for a water swelling forming die as claimed in claim 1, characterized in that: The limiting movable component (30) is divided into two sections, an inner section and an outer section. The cross-sectional area of ​​the inner section of the limiting movable component (30) is larger than the cross-sectional area of ​​the outer section. A limiting step (32) is formed at the junction of the inner section and the outer section of the limiting movable component (30). The mounting groove (29) of the lower die seat (4) is provided with a limiting step surface (33) that matches the limiting step (32) of the limiting movable component (30).

4. A positioning and material-removing device for a water swelling forming die as claimed in claim 1, characterized in that: The positioning portion (28) of the lower guide rod (16) is a concave cone surface.

5. A positioning and material-removing device for a water swelling forming die as claimed in claim 1, characterized in that: The top of the upper guide rod (5) is pressed against the bottom of the upper spring (8) through an upper water sealing block (9), and the bottom of the lower guide rod (16) is pressed against the top of the lower spring (18) through a lower water sealing block (19).

6. A device for positioning and withdrawing a water swelling forming die as claimed in claim 5, characterized in that: An upper fixing sleeve (10) is sleeved on the periphery of the upper section of the upper guide rod (5), and the lower limit position of the movement of the upper water sealing block (9) is limited by the top of the upper fixing sleeve (10); and a lower fixing sleeve (20) is sleeved on the periphery of the lower section of the lower guide rod (16), and the upper limit position of the movement of the lower water sealing block (19) is limited by the bottom of the lower fixing sleeve (20).

7. A device for positioning and withdrawing a water swelling forming die as claimed in claim 5, characterized in that: A first water sealing block (15) is provided on the top of the upper water expansion block (12), and the first water sealing block (15) is movably mounted outside the upper guide rod (5). A second water sealing block (25) is provided on the bottom of the lower water expansion block (22), and the second water sealing block (25) is movably mounted outside the lower guide rod (16).

8. A device for positioning and withdrawing a water swelling forming die as claimed in claim 1, characterized in that: The positioning drive mechanism is a cylinder (31), and the piston rod of the cylinder (31) pushes the limiting movable component (30) to move radially.

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