A special-shaped kettle hydro-expansion mold

Abstract

The present invention discloses a special-shaped kettle hydroforming die, which includes an upper die base, a lower die base, an upper die assembly, an upper die barrel, a split block movable assembly, a lower die assembly, and a lower die knockout plate. An elastic support member is provided between the lower die knockout plate and the lower die base, and the elastic support member supports the upward movement of the lower die knockout plate. A hydroforming water sealing area is formed at the joint of the split block movable assembly and the lower die assembly. The split block movable assembly is rotatably connected to the lower die knockout plate and forms a mold closing position or a mold opening position. At the mold closing position, both ends of the split block movable assembly cooperate with the upper die assembly and the lower die assembly respectively to form a hydroforming cavity. At the mold opening position, the bottom surface of the split block movable assembly is disengaged from the end surface of the lower die assembly to form a gap of 4-8 mm. The present invention adopts the method of end face water sealing, which will not cause damage to the inner wall. The water sealing member does not need to be consistent with the shape of the mouth of the special-shaped kettle, which is convenient for replacement and reduces costs, overcoming the defects in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of the manufacture of pots, and particularly to a hydroforming mold for a special-shaped pot. Background Art

[0002] Most of the existing pots are circular or regular products, and their manufacturing processes are relatively mature. However, there is still great room for development in the manufacture of special-shaped pots. Since the manufacturing process of special-shaped pots requires unique processes and molds, especially the hydroforming process, the traditional hydroforming mold suitable for cylindrical pots cannot be directly applied to special-shaped pots.

[0003] In the hydroforming mold of conventional pots, the commonly used water injection mandrel and circular water sealing rubber strip are used. The water injection mandrel is used to extend into the pot blank for water injection, and the circular water sealing rubber strip needs to be attached to the port of the inner pot liner for water sealing treatment. However, this hydroforming process has defects in the preparation of special-shaped pots:

[0004] (1) The production of the water injection mandrel suitable for special-shaped pots is complex, and during the process of the water injection mandrel extending into the pot blank, it is easy to cause abrasions to the inner wall.

[0005] (2) For the hydroforming mold of conventional pots that uses water sealing at the port, that is, the shapes of the sealing member and the pot port need to be the same, so as to fit the port of the pot blank to achieve the water sealing effect. However, for special-shaped pots with irregular ports, it is very difficult to seal. The main reason is that it is very difficult for the conventional water sealing member to fit the shape of the port of the special-shaped pot blank. Therefore, the shape requirements for the water sealing rubber strip are very high, and it is very difficult to ensure the water sealing effect.

[0006] (3) For another hydroforming mold with water sealing at the port, after the water sealing rubber strip reaches the fracture fatigue state after being used for a period of time, it will generate tiny debris and be carried into the hydroforming cavity by the high-pressure water flow, resulting in the formation of concave points on the inner wall of the pot blank.

[0007] Therefore, the existing hydroforming molds for conventional pots are difficult to adapt to the hydroforming molds for special-shaped pots and urgently need to be improved. Summary of the Invention

[0008] Aiming at the problem that the existing hydroforming molds for conventional pots are difficult to adapt to the hydroforming molds for special-shaped pots, and there are defects such as complex production of the water injection mandrel and easy abrasion of the inner wall, and it is very difficult for the water sealing rubber strip to be consistent with the shape of the special-shaped pot product, the present invention provides a new hydroforming mold for special-shaped pots.

[0009] In order to solve the above technical problems, the present invention is realized through the following technical solutions:

[0010] A special-shaped kettle hydroforming mold includes an upper die base and a lower die base, and also includes an upper die assembly, an upper die barrel, a split block movable assembly, a lower die assembly, and a lower die knockout plate. The upper die assembly is connected to the upper die base. The upper die barrel is detachably connected to the upper die base and abuts against the upper die assembly. The lower die assembly passes through the lower die knockout plate and is connected to the lower die base. An elastic support member is provided between the lower die knockout plate and the lower die base. The elastic support member supports the upward movement of the lower die knockout plate and limits the lower die knockout plate through the lower die assembly. A seal is provided at the connection between the lower die assembly and the lower die base. Water injection channels are provided in both the lower die base and the lower die assembly. A hydroforming water sealing area is formed at the joint between the split block movable assembly and the lower die assembly. A water sealing member is filled in the hydroforming water sealing area. The split block movable assembly is rotatably connected to the lower die knockout plate to form a mold closing position or a mold opening position. In the mold closing position, both ends of the split block movable assembly cooperate with the upper die assembly and the lower die assembly respectively to form a hydroforming cavity, which is a special-shaped irregular cavity. The upper die barrel limits the split block movable assembly. In the mold opening position, the bottom surface of the split block movable assembly is separated from the end surface of the lower die assembly to form a gap of 4-8 mm.

[0011] In the above-mentioned special-shaped kettle hydroforming mold, the upper die base and the lower die base play a supporting role. The special-shaped irregular hydroforming cavity is used to form the special-shaped kettle. The upper die assembly, the split block movable assembly, and the lower die assembly are important components for forming the special-shaped irregular hydroforming cavity. The lower die knockout plate and the elastic support member play an important role in the demolding process of the special-shaped kettle. A hydroforming water sealing area is formed at the joint between the split block movable assembly and the lower die assembly, and a water sealing member is used to fill the hydroforming water sealing area to close the special-shaped irregular hydroforming cavity.

[0012] During the mold closing process, high-pressure water enters the hydroforming cavity through the water injection channel, and a large water pressure is formed in the hydroforming cavity. The upper die barrel can prevent the split block movable assembly from being incompletely closed due to the water pressure, thus ensuring the accuracy and stability of mold closing. In addition, the hydroforming water sealing area can press the end surface of the special-shaped kettle, and then the water sealing member is used to solve the water sealing problem at the joint between the split block movable assembly and the lower die assembly, so as to ensure that there is no water leakage at the joint under the action of the hydroforming pressure and ensure the stability of the hydroforming pressure.

[0013] During the mold opening process, the elastic support member can lift the lower die knockout plate, so that the bottom surface of the split block movable assembly is separated from the end surface of the lower die assembly to form a gap of 4-8 mm, which is not only convenient for the operator to place the kettle blank, but also more conducive to taking out the special-shaped kettle.

[0014] Different from the existing port water sealing technology, the present invention adopts the method of end face water sealing. Firstly, there is no need for a mandrel to extend into the special-shaped pot, so the inner wall will not be damaged. Secondly, the water sealing member is arranged in the hydroforming water sealing area and does not need to be consistent with the shape of the mouth of the special-shaped pot. Therefore, the shape of the water sealing member can be selected as a conventional shape, which is convenient for replacement and reduces costs, completely overcoming the defects existing in the prior art.

[0015] Preferably, for the above-mentioned special-shaped pot hydroforming mold, the upper mold assembly includes an upper mold core block and an upper mold spacer block. The upper mold spacer block limits the upper mold core block, and the edge of the upper mold spacer block abuts against the upper mold barrel.

[0016] The upper mold core block is used to close the hydroforming cavity, and the upper mold spacer block plays a role in fixing the upper mold core block. The edge of the upper mold spacer block abuts against the upper mold barrel, which can better position and limit the upper mold barrel.

[0017] Preferably, for the above-mentioned special-shaped pot hydroforming mold, the split block moving assembly includes split blocks and a mold-opening movable plate. The split blocks are detachably connected to the mold-opening movable plate. The mold-opening movable plate is provided with a handle end and a connecting end. The connecting end is rotatably connected to the lower mold knockout plate, and the handle end and the connecting end are opposite in position. The split blocks are provided with exhaust channels.

[0018] The split blocks are connected to the mold-opening movable plate, so that the mold-opening movable plate can drive the split blocks to move synchronously. The mold-opening movable plate is rotatably connected to the lower mold knockout plate through the connecting end, and the operator can rotate the mold-opening movable plate through the handle end to further rotate the split blocks.

[0019] The exhaust channels can discharge the air in the closed mold hydroforming cavity, so that the pot blank can better adhere to the inner wall of the split blocks under the hydroforming pressure, enhancing the dimensional and shape stability of the manufactured special-shaped pot.

[0020] Preferably, for the above-mentioned special-shaped pot hydroforming mold, the lower mold assembly includes a lower mold core block and a lower mold core seat. One end of the lower mold core block is embedded in the lower mold core seat, and the other end of the lower mold core block is matched with the bottom end of the inner wall of the split blocks. The end face of the lower mold core block is 10-20 mm higher than the end face of the lower mold core seat and forms a flanging step. The lower mold core block and the upper mold core block are coaxially arranged, and there is an eccentric distance between the center of gravity line of the lower mold core seat and the center of gravity line of the split blocks.

[0021] The pot blank needs to be pre-positioned before hydroforming. The arc surfaces on both sides of the lower mold core block play a role in pre-positioning the pot blank. The lower mold core seat is used to fix the lower mold core block and ensure that the lower mold core block will not move during hydroforming. Before mold closing, the end face of the pot blank is placed on the end face of the lower mold core seat. The lower mold core block and the lower mold core seat form a flanging step, which can better cooperate with the split block moving assembly to jointly form the port of the special-shaped pot.

[0022] Due to the different shapes of the special-shaped pot in all directions, both sides of the pot blank are pressed concave towards the inside of the pot during the water swelling process, and the degrees of concave pressing on both sides are completely different, resulting in the offset of the center of the pot body of the special-shaped pot compared to the center of the original blank. Therefore, an eccentric distance is provided between the center of gravity line of the lower die core seat and the center of gravity line of the haff block to facilitate the molding of the special-shaped pot with the above eccentric structure. Preferably, the eccentric distance is set to 2 ± 0.5 mm.

[0023] Preferably, for the above-mentioned water swelling mold for special-shaped pots, one end of the upper die core block that cooperates with the haff block moving component is conical.

[0024] One end of the upper die core block being conical can play a better guiding role during the mold closing process.

[0025] Preferably, for the above-mentioned water swelling mold for special-shaped pots, 2 limit posts are symmetrically arranged on the lower die knockout plate, and the opening movable plate abuts against the limit posts in the open mold position.

[0026] The limit posts are used to limit the rotation angle of the opening movable plate to avoid the situation of detachment caused by too large a rotation angle of the opening movable plate.

[0027] Preferably, for the above-mentioned water swelling mold for special-shaped pots, both the inner wall of the upper die barrel and the outer side surface of the haff block are provided with a taper of 6° - 15°.

[0028] The outer side surface of the haff block and the inner wall of the upper die barrel both adopt the above taper design, which can play a guiding role during mold closing. If the taper is too small, the friction increases and demolding is difficult; if the taper is too large, the larger the outer diameter of the outer shell water swelling mold and the inner liner water swelling mold, the larger the floor area, the greater the mold weight, and it is not convenient for disassembly and assembly, and the practicability is poor. The present invention adopts the above taper range to ensure the stability and accuracy of the mold opening and closing process.

[0029] Preferably, for the above-mentioned water swelling mold for special-shaped pots, the lower die core seat is provided with a groove and a material storage area. The groove is adapted to the water sealing member, and a fillet with a radius of 10 ± 0.5 mm is provided at the position corresponding to the material storage area on the haff block.

[0030] The groove is used to place the water sealing member and position the water sealing member. Since the height of the product before water swelling is higher than the height of the product after water swelling, the material storage area is used to make up for the height difference of the product before and after water swelling.

[0031] By providing a fillet at the position corresponding to the material storage area on the haff block, the material at the bottom of the pot blank can be used as a supplementary material for side drawing, solving the problem of insufficient drawing material for the pot blank.

[0032] Preferably, in the above-mentioned special-shaped kettle hydroforming die, the water seal member is an O-shaped silicone ring.

[0033] The O-shaped silicone ring is a commonly used silicone ring in the art, which is convenient to purchase and reduces costs.

[0034] Preferably, the above-mentioned special-shaped kettle hydroforming die further includes an upper die shoe plate and die shoe columns, and both ends of the die shoe columns are respectively connected to the upper die shoe plate and the upper die base.

[0035] The upper die base is fixed on the upper die shoe plate through the die shoe columns, which makes it more convenient to operate when opening and closing the die and has stronger practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a cross-sectional view of the present invention in the mold opening position;

[0037] Figure 2 It is a schematic structural view of the upper die assembly, the split block, and the lower die assembly of the present invention;

[0038] Figure 3 It is a top view of the present invention;

[0039] Figure 4 It is a perspective view of the present invention in the mold opening position;

[0040] Figure 5 It is a schematic structural view of the lower die core block of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The following further describes the present invention in detail in conjunction with the appended Figures 1-5 drawings and specific embodiments, but they do not limit the present invention:

[0042] Embodiment 1

[0043] A special-shaped kettle hydroforming mold includes an upper die base 1, a lower die base 6, an upper die assembly 11, an upper die barrel 2, a split block movable assembly 3, a lower die assembly 9, and a lower die knockout plate 4. The upper die assembly 11 is connected to the upper die base 1. The upper die barrel 2 is detachably connected to the upper die base 1 and abuts against the upper die assembly 11. The lower die assembly 9 passes through the lower die knockout plate 4 and is connected to the lower die base 6. An elastic support member 5 is provided between the lower die knockout plate 4 and the lower die base 6. The elastic support member 5 supports the lower die knockout plate 4 to move upward and limits the lower die knockout plate 4 through the lower die assembly 9. A seal 7 is provided at the connection between the lower die assembly 9 and the lower die base 6. Water injection channels are provided in both the lower die base 6 and the lower die assembly 9. A hydroforming water sealing area 93 is formed at the joint between the split block movable assembly 3 and the lower die assembly 9. A water sealing member 8 is filled in the hydroforming water sealing area 93. The split block movable assembly 3 is rotatably connected to the lower die knockout plate 4 to form a mold closing position or a mold opening position. In the mold closing position, both ends of the split block movable assembly 3 cooperate with the upper die assembly 11 and the lower die assembly 9 respectively to form a hydroforming cavity. The hydroforming cavity is a special-shaped irregular cavity. The upper die barrel 2 limits the split block movable assembly 3. In the mold opening position, the bottom surface of the split block movable assembly 3 is separated from the end surface of the lower die assembly 9 to form a gap of 4 - 8 mm.

[0044] The mold closing process of the present invention is as follows: First, place the special-shaped kettle blank into the hydroforming cavity according to the guidance of the lower die assembly 9, and then manually close the split block movable assembly 3 so that the special-shaped kettle blank is located at the center position of the hydroforming cavity. Since the split block movable assembly 3 cannot be completely closed manually, the operator presses the upper die base 1 and the upper die barrel 2 onto the split block movable assembly 3, thus completing the mold closing. Then start the hydroforming machine, and high-pressure water flows into the hydroforming cavity from the water injection channel.

[0045] The mold opening process of the present invention is as follows: The operator pulls up the upper die base 1 and the upper die barrel 2. The lower die knockout plate 4 moves upward under the elastic force of the elastic support member 5. The bottom surface of the split block movable assembly 3 is separated from the end surface of the lower die assembly 9 to form a gap of 4 - 8 mm. Then the operator manually opens the split block movable assembly 3 to expose the special-shaped kettle, and the operator takes out the hydroformed special-shaped kettle from the gap.

[0046] Preferably, the upper die assembly 11 includes an upper die core block 112 and an upper die spacer 111. The upper die spacer 111 limits the upper die core block 112, and the edge of the upper die spacer 111 abuts against the upper die barrel 2.

[0047] Preferably, the split block movable assembly 3 includes a split block 32 and a mold-opening movable plate 31. The split block 32 is detachably connected to the mold-opening movable plate 31. The mold-opening movable plate 31 is provided with a handle end 311 and a connection end 312. The connection end 312 is rotatably connected to the lower die knockout plate 4. The handle end 311 and the connection end 312 are opposite in position. The split block 32 is provided with an exhaust passage 33.

[0048] Preferably, the lower die assembly 9 includes a lower die core block 92 and a lower die core seat 91. One end of the lower die core block 92 is embedded in the lower die core seat 91. The other end of the lower die core block 92 is engaged with the bottom end inner wall of the split block 32. The end face of the lower die core block 92 is 10-20 mm higher than the end face of the lower die core seat 91 to form a flanging step. The lower die core block 92 and the upper die core block 112 are coaxially arranged. There is an eccentric distance between the center of gravity line of the lower die core seat 91 and the center of gravity line of the split block 32.

[0049] Preferably, one end of the upper die core block 112 that cooperates with the split block movable assembly 3 is conical.

[0050] Preferably, the lower die knockout plate 4 is symmetrically provided with two limit posts 41. In the mold-opening position, the mold-opening movable plate 31 abuts against the limit posts 41.

[0051] Preferably, both the inner wall of the upper die barrel 2 and the outer side surface of the split block 32 are provided with a taper of 6°-15°.

[0052] Preferably, the lower die core seat 91 is provided with a groove 911 and a material storage area 912. The groove 911 is adapted to the water sealing member 8. The split block 32 is provided with a fillet 34 with a radius of 10±0.5 mm at a position corresponding to the material storage area 912.

[0053] Preferably, the water sealing member 8 is an O-shaped silica gel ring.

[0054] Preferably, it further includes an upper mold base plate 12 and mold base columns 13. The two ends of the mold base columns 13 are respectively connected to the upper mold base plate 12 and the upper mold seat 1.

[0055] The mold-closing process of the present invention is as follows: First, the special-shaped kettle blank is placed into the hydroforming cavity according to the guidance of the lower die core block 92. Then, manually rotate the handle end 311 of the mold-opening movable plate 31 and close the split block 32 so that the special-shaped kettle blank is located at the center position of the hydroforming cavity. Since the operator cannot completely close the split block 32 manually, the operator presses the upper die core block 12 and the upper die barrel 2 onto the split block 32, that is, the mold-closing is completed. Then, start the hydroforming machine, and high-pressure water flows into the hydroforming cavity from the water injection passage.

[0056] The mold opening process of the present invention is as follows: The operator pulls up the upper mold base 1 and the upper mold barrel 2. The lower mold knockout plate 4 moves upward under the elastic force of the elastic support member 5, and the mold opening movable plate 31 also moves upward. The bottom surface of the split block 32 disengages from the end surface of the lower mold core seat 91, and a gap of 4 - 8 mm is formed. Then the operator manually opens the split block 32 to expose the special-shaped kettle, and the operator takes out the water-expanded special-shaped kettle from the gap.

[0057] In summary, the above are only the preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. An irregular-shaped kettle hydroforming mold, comprising an upper die base (1) and a lower die base (6), characterized in that: It further includes an upper die assembly (11), an upper die barrel (2), a split block movable assembly (3), a lower die assembly (9), and a lower die knockout plate (4). The upper die assembly (11) is connected to the upper die base (1). The upper die barrel (2) is detachably connected to the upper die base (1) and abuts against the upper die assembly (11). The lower die assembly (9) passes through the lower die knockout plate (4) and is connected to the lower die base (6). An elastic support member (5) is provided between the lower die knockout plate (4) and the lower die base (6). The elastic support member (5) supports the lower die knockout plate (4) to move upward and limits the lower die knockout plate (4) through the lower die assembly (9). A seal member (7) is provided at the connection between the lower die assembly (9) and the lower die base (6). Water injection channels are provided in both the lower die base (6) and the lower die assembly (9). A hydroforming sealing area (93) is formed at the joint between the split block movable assembly (3) and the lower die assembly (9). A water sealing member (8) is filled in the hydroforming sealing area (93). The split block movable assembly (3) is rotatably connected to the lower die knockout plate (4) to form a mold closing position or a mold opening position. At the mold closing position, both ends of the split block movable assembly (3) cooperate with the upper die assembly (11) and the lower die assembly (9) respectively to form a hydroforming cavity. The hydroforming cavity is a special-shaped irregular cavity. The upper die barrel (2) limits the split block movable assembly (3). At the mold opening position, the bottom surface of the split block movable assembly (3) is separated from the end surface of the lower die assembly (9) to form a gap of 4 - 8 mm. The water sealing member (8) is an O-shaped silica gel ring. It further includes a mold base upper plate (12) and mold base columns (13). Both ends of the mold base columns (13) are connected to the mold base upper plate (12) and the upper die base (1) respectively.

2. The irregular-shaped kettle hydroforming mold according to claim 1, characterized in that: The upper die assembly (11) includes an upper die core block (112) and upper die spacer blocks (111). The upper die spacer blocks (111) limit the upper die core block (112). The edges of the upper die spacer blocks (111) abut against the upper die barrel (2).

3. The irregular-shaped kettle hydroforming mold according to claim 2, characterized in that: The split block movable assembly (3) includes split blocks (32) and a mold opening movable plate (31). The split blocks (32) are detachably connected to the mold opening movable plate (31). A handle end (311) and a connection end (312) are provided on the mold opening movable plate (31). The connection end (312) is rotatably connected to the lower die knockout plate (4). The handle end (311) and the connection end (312) are opposite in position. An exhaust channel (33) is provided on the split blocks (32).

4. The irregular-shaped kettle hydroforming mold according to claim 3, characterized in that: The lower die assembly (9) includes a lower die core block (92) and a lower die core seat (91). One end of the lower die core block (92) is embedded in the lower die core seat (91), and the other end of the lower die core block (92) is engaged with the inner wall bottom end of the split block (32). The end face of the lower die core block (92) is 10-20 mm higher than the end face of the lower die core seat (91) to form a flanging step. The lower die core block (92) is coaxially arranged with the upper die core block (112). There is an eccentric distance between the center of gravity line of the lower die core seat (91) and the center of gravity line of the split block (32).

5. The irregular-shaped kettle hydroforming mold according to claim 3, characterized in that: One end of the upper die core block (112) that cooperates with the split block movable assembly (3) is conical.

6. The irregular-shaped kettle hydroforming mold according to claim 4, characterized in that: Two limit posts (41) are symmetrically arranged on the lower die knockout plate (4). In the open die position, the open die movable plate (31) abuts against the limit posts (41).

7. The irregular-shaped kettle hydroforming mold according to claim 4, characterized in that: The inner wall of the upper die barrel (2) and the outer side surface of the split block (32) are both provided with a taper of 6°-15°.

8. The irregular-shaped kettle hydroforming mold according to claim 4, characterized in that: The lower die core seat (91) is provided with a groove (911) and a material storage area (912). The groove (911) is adapted to the water sealing member (8). A fillet (34) with a radius of 10±0.5 mm is provided at a position corresponding to the material storage area (912) on the split block (32).

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