A system for the die forming of a welded toroid

Abstract

The utility model discloses a kind of welding ring die forming systems, including several groups of forming tooling;The forming tooling includes upper die mechanism and lower die mechanism, wherein upper die mechanism is equipped with pressure block towards the middle position of lower die mechanism, lower die mechanism is equipped with male die towards the middle position of upper die mechanism, the bottom of the male die is connected with driving assembly, the top of lower die mechanism and located the outside of male die is equipped with two groups of sliding type forming guard block;Several groups of forming tooling gradually increase along with the size of pressure block, forming guard block and male die inside it in working direction.This application adopts same process multi-channel hydraulic forming die structure, through the segmented operation of same work step, make welding ring internal residual stress release through multi-channel extrusion plastic deformation, homogenization deformation, reach the requirement of improving welding ring roundness, i.e. Small roundness tolerance requirement;While facing different specifications model welding ring, can be switched freely by replacing pressure block, male die, lower die mechanism etc.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a welding ring molding system. Background Technology

[0002] This application relates to automotive air suspension and air springs, as well as welded clamping rings and support rings required in the automotive repair and maintenance industry. The specifications and types of clamping rings and support rings for air springs and air suspensions are numerous, with varying requirements for ring appearance and dimensions. Traditional processes involve a multi-lobed inner support and outer extrusion simultaneous rounding mold for one-time rounding. While this rounding mold structure is simple, it results in indentations on the inner ring and large roundness deviations, leading to poor stability and failing to meet the requirement of small roundness tolerances.

[0003] For example, patent application CN215614644U discloses a synchronous inner and outer circular forming mold for a ring, including an upper mold and a lower mold. The lower mold includes a mounting platform, a lower mold base fixed to the surface of the mounting platform, an inner circle forming component located at the center of the lower mold base, and outer circle forming components symmetrically installed on the surface of the lower mold base on both sides of the inner circle forming component. The inner circle forming component includes a middle block and multiple inner circle forming blocks, which are arranged around the middle block and slide obliquely. The outer circle forming component includes a semi-circular forming block and an oblique slider. This existing mold has inner and outer circular forming components on its lower mold base, which form the inner and outer circles of the workpiece. The inner circle forming component is set as a multi-lobed structure, and the circular forming process adopts one-time circular forming. This method will result in imprints on the inner ring and large roundness deviation, poor stability, and cannot meet the requirement of small roundness tolerance. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problem that the roundness tolerance of the welding ring forming process cannot be met.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A welding ring molding system includes several component tooling fixtures; the molding tooling fixtures include an upper mold mechanism and a lower mold mechanism, wherein the upper mold mechanism is provided with a pressure block at the middle position facing the lower mold mechanism, and the lower mold mechanism is provided with a punch at the middle position facing the upper mold mechanism. The bottom of the punch is connected to a drive assembly, and the top of the lower mold mechanism and located outside the punch are provided with two sets of sliding molding guard blocks; the dimensions of the pressure block, molding guard blocks and punch inside the several component tooling fixtures gradually increase along the working direction.

[0007] This application adopts a multi-stage hydraulic forming mold structure with the same process. Through segmented operation in the same step, the residual stress inside the welded ring is released through multiple extrusion plastic deformation, and the deformation is uniform, so as to improve the roundness requirement of the welded ring, that is, the roundness tolerance requirement is small. At the same time, for welded rings of different specifications and models, the mold can be freely switched by changing the pressure block, punch, and lower mold mechanism, thereby improving the mold changing efficiency.

[0008] As a further embodiment of this utility model: the upper mold mechanism includes an upper mold base, an upper pad, an upper pad plate and an upper fixing plate. The upper mold base and the upper pad plate are connected by the upper pad. The bottom of the upper pad plate is detachably connected to the upper fixing plate. The pressure block is detachably installed at the bottom center of the upper fixing plate facing the lower mold mechanism.

[0009] As a further embodiment of this utility model: at the four corner positions of the bottom of the upper pad, there are upper limit posts one and two that can pass through the upper fixed plate, and two sets of inserts that can drive the forming protective blocks to move relative to each other are symmetrically arranged on both sides of the bottom of the upper pad.

[0010] As a further embodiment of this utility model: the top of the lower mold mechanism and the outer side of the forming guard block are provided with a pressure strip for limiting its sliding movement, and the top of the lower mold mechanism and the end of the forming guard block are provided with a slider seat, and the slider seat has a cutting groove facing one side of the forming guard block.

[0011] As a further embodiment of this utility model: the lower mold mechanism includes a lower template, a lower pad, a lower fixing plate, and a lower mold base. The bottom of the lower template is detachably connected to the lower pad. The four corners of the bottom of the lower template are provided with lower limiting posts that can pass through the lower pad. The bottom of the lower limiting posts is connected to the lower fixing plate. The bottom of the lower fixing plate is detachably connected to the lower mold base.

[0012] As a further embodiment of this utility model: a punch base is provided between the lower pad plate and the lower fixed plate, and a punch movable connecting column is slidably connected inside the punch base. The top of the punch movable connecting column is detachably connected to the punch, and a driving component is connected to the bottom of the punch movable connecting column.

[0013] As a further embodiment of this utility model: the driving assembly includes a connecting rod and an external driving component. The connecting rod passes through the lower mold base and the lower fixed plate from the bottom of the lower mold base and then connects to the movable connecting column of the punch.

[0014] As a further embodiment of this utility model: the outer side of the movable connecting column of the punch is provided with a protrusion, and the inner sliding groove of the punch base is provided with a protrusion sliding groove corresponding to the protrusion, so that the protrusion can slide in the protrusion sliding groove.

[0015] As a further embodiment of this utility model, the bottom of the lower mold base is detachably equipped with mold feet.

[0016] As a further embodiment of this utility model: the several sets of molding fixtures respectively include molding fixture one, molding fixture two and molding fixture three;

[0017] The forming tooling completes 40% to 70% of the plastic deformation of the welded ring;

[0018] The second forming tool completes 70% to 90% of the plastic deformation of the welded ring;

[0019] The forming fixture completes 90% to 100% of the plastic deformation of the welded ring.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This application adopts a multi-stage hydraulic forming mold structure with the same process. Through segmented operations in the same step (pre-rounding one, pre-rounding two, forming), the residual stress inside the welded ring is released through multiple extrusion plastic deformations, and the deformation is uniform, thereby improving the roundness requirements of the welded ring. At the same time, for welded rings of different specifications and models, free switching can be achieved by changing the pressure block, punch, and lower mold mechanism, thereby improving the mold changing efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the welding ring hydraulic forming system according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a single-component molding tool according to an embodiment of the present utility model;

[0024] Figure 3 This is a structural schematic diagram of the welding ring hydraulic forming system according to another embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the lower mold mechanism in an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of the forming process of the welding ring molding system according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the forming process of the welding ring according to an embodiment of the present invention;

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Molding fixture one; 200. Molding fixture two; 300. Molding fixture three;

[0030] 2. Upper mold base; 3. Upper pad; 4. Upper backing plate; 5. Upper fixing plate; 6. Upper limit post one; 7. Upper limit post two; 8. Pressure strip; 9. Forming guard block; 10. Slider backing; 11. Lower template; 12. Lower backing plate; 13. Lower limit post; 14. Lower fixing plate; 15. Mold foot; 16. Connecting rod; 17. Punch base; 18. Lower mold base; 19. Pressure block; 20. Punch; 21. Punch movable connecting post; 22. Cutting tool; 23. Cutting tool hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Reference Figure 1 A welding ring molding system includes molding fixture 100, molding fixture 200, and molding fixture 300. The welding ring is placed into molding fixture 100, molding fixture 200, and molding fixture 300 at a time for hydraulic molding. First, the welding ring undergoes 40% to 70% plastic deformation in molding fixture 100, then 70% to 90% plastic deformation in molding fixture 200, and finally 90% to 100% plastic deformation in molding fixture 300. The transfer between each process is completed by a robotic arm.

[0033] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The forming fixture 100 includes an upper mold mechanism and a lower mold mechanism. The upper mold mechanism specifically includes an upper mold base 2, an upper pad 3, an upper pad plate 4, an upper fixed plate 5, an upper limit post 1 6, an upper limit post 2 7, a pressure block 19, and a cutting tool 22. The lower mold mechanism specifically includes a pressure strip 8, a forming guard block 9, a slider backing 10, a lower template 11, a lower pad plate 12, a lower limit post 13, a lower fixed plate 14, a mold foot 15, a connecting rod 16, a punch base 17, a lower mold base 18, a punch 20, and a punch movable connecting post 21.

[0034] Reference Figure 1 and Figure 3The bottom of the upper mold base 2 is connected to the upper pad 4 via the upper pad foot 3. The bottom of the upper pad 4 is detachably connected to the upper fixing plate 5 via bolts or pins. A pressure block 19 is detachably connected to the middle of the bottom of the upper fixing plate 5 via bolts or pins. Upper limit post 1 6 and upper limit post 2 7 are fixed at the four corners of the bottom of the upper pad 4. The bottoms of upper limit post 1 6 and upper limit post 2 7 both protrude from the upper fixing plate 5. Inserting knives 22 are fixed on both symmetrical sides of the bottom of the upper pad 4.

[0035] Reference Figure 1 , Figure 2 and Figure 4 The bottom of the lower template 11 is detachably connected to a lower pad 12 via bolts or pins. Lower limit posts 13 are provided at the four corners of the bottom of the lower template 11, with the bottom of each lower limit post 13 extending through the lower pad 12 and connecting to the lower fixed plate 14. A punch base 17 is provided between the lower pad 12 and the lower fixed plate 14. A punch movable connecting post 21 is installed inside the punch base 17. The bottom of the punch movable connecting post 21 is connected to a connecting rod 16, which passes through the lower fixed plate 14 and the lower mold base 18, connecting to the punch movable connecting post 21 from the bottom. A punch 20 is installed at the top of the punch movable connecting post 21 (see reference). Figure 2 The connecting rod 16 can drive the movable connecting column 21 of the punch to slide vertically inside the punch base 17, thereby adjusting the position of the punch 20.

[0036] It should be noted that the bottom of the punch base 17 has an outwardly expanding groove, and the bottom of the punch movable connecting column 21 has a corresponding protrusion. Therefore, the protrusion can slide vertically in the groove, and the vertical travel distance of the punch 20 is consistent with the height of the groove.

[0037] A mold cavity is opened at the top center of the lower template 11, and the punch 20 is located inside the mold cavity. Left and right forming blocks 9 are slidably connected to the left and right sides of the mold cavity. A slider seat 10 is provided at the top of the lower template 11 and on the outside of the two forming blocks 9. The slider seat 10 has a cutting groove on the side facing the forming block 9. Correspondingly, a cutting hole 23 is opened on the lower template 11 and the lower pad 12 at the position corresponding to the cutting groove. During subsequent work, the cutting knife 22 can pass through the cutting hole 23 to squeeze the forming block 9 towards the mold cavity in the middle of the lower template 11. It should be noted that an arc-shaped slot is opened on the side of the forming block 9 facing the mold cavity. The arc-shaped slots of the two sets of forming blocks 9 can be spliced ​​to form a circular slot.

[0038] Pressure strips 8 are installed on the top of the lower template 11 and on both the front and rear sides of the two forming blocks 9. The pressure strips 8 and the slider seat 10 are detachably connected by bolts or pins. The pressure strips 8 and the slider seat 10 are used to limit the movement direction of the forming blocks 9 to ensure that the forming blocks 9 can only slide towards the mold cavity. Limiting holes that cooperate with upper limit post 1 6 and upper limit post 2 7 are also provided on the pressure strips 8. When the upper mold mechanism presses down, upper limit post 1 6 and upper limit post 2 7 can extend into the limiting holes.

[0039] Reference Figure 4 The bottom of the lower fixing plate 14 is detachably fixed to the lower mold base 18 by bolts or pins, and the bottom of the lower mold base 18 is fitted with mold feet 15 by bolts or pins.

[0040] This application employs a multi-stage hydraulic forming mold structure with the same process. Through segmented operations in the same step (forming tooling 100, forming tooling 200, and forming tooling 300 for three-stage forming), the residual stress inside the welded ring is released through multiple extrusion plastic deformations, resulting in uniform deformation and improving the roundness requirement of the welded ring. Furthermore, for welded rings of different specifications and models, free switching can be achieved by replacing the pressure block 19, punch 20, and lower mold components (pressure strip 8, forming guard block 9, slider support 10, lower template 11, and lower pad 12, etc.), thereby improving mold changing efficiency.

[0041] It should be noted that the internal structures of molding tooling 100, molding tooling 200 and molding tooling 300 are the same. The difference is that the dimensions of the internal pressure block 19, molding guard block 9 and punch 20 increase sequentially. This application takes molding tooling 100 as an example to introduce its specific structure. The specific structures of molding tooling 200 and molding tooling 300 are deduced by analogy.

[0042] The specific operating principle of this application is as follows:

[0043] This application provides a hydraulic forming process for welded rings with small roundness tolerance (high roundness), which adopts a multi-stage hydraulic forming mold structure in the same process to form welded rings.

[0044] 1. Molding action of molding fixture 100: All steps described below are completed within molding fixture 100.

[0045] 1-1. Close the fixture, then complete the hoisting of the upper mold mechanism and the lower mold mechanism, and open the upper mold mechanism.

[0046] 1-2. Place the welding ring into the mold cavity (between the left and right forming blocks 9), and press down the upper mold through the upper limit post 1 6 and the upper limit post 2 7 for positioning and guidance.

[0047] 1-3. During the pressing process, the inserter 22 presses down on the inserter hole 23 and extrudes the forming block 9, driving the left and right forming blocks 9 to move towards the center for positioning; continue pressing down until the upper and lower mold mechanisms are closed by the upper stop post, and the mold is fully closed (refer to...). Figure 5 The pressure block 19 also presses down on the welding ring, thus smoothing the plane.

[0048] 1-4. The hydraulic lower ejector cylinder (not shown in the figure) pushes upward, driving the connecting rod 16 and the movable connecting column 21 of the punch to eject the punch 20; the forming fixture 100 completes 40% to 70% of the plastic deformation of the welding ring.

[0049] 1-5. The punch 20 extrudes and welds the ring, completing the molding process.

[0050] 1-6. After molding is completed, the upper mold mechanism returns to its original position along with the hydraulic equipment (not shown in the figure); at the same time, the hydraulic lower ejector cylinder (not shown in the figure) drives the connecting rod 16, the movable connecting column of the punch 21, and the punch 20 to return to their original positions.

[0051] 2. Molding action of molding fixture 200: All steps described below are completed within molding fixture 200.

[0052] 2-1. Place the pre-formed welding ring of forming fixture 100 into the mold cavity of forming fixture 200 (i.e., between the left and right forming blocks 9 inside forming fixture 200). The upper mold mechanism of the mold is positioned and guided downward by the limiting column.

[0053] 2-2. During the pressing process, the insert 22 of the forming fixture 200 presses down on the insert hole 23 of the forming fixture 200 and squeezes the forming guard block 9. The left and right forming guard blocks 9 move towards the middle for positioning. The pressing continues until the upper mold mechanism and the lower mold mechanism are closed by the upper limit post, and the mold is fully closed. The pressure block 19 of the forming fixture 200 also presses down on the welding ring, which plays a role in smoothing the plane.

[0054] 2-3. The hydraulic lower ejector cylinder (not shown in the figure) pushes upward, driving the connecting rod 16 of the forming tool 200 and the movable connecting column 21 of the punch to eject the punch 20; the forming tool 200 completes 70% to 90% of the plastic deformation of the welding ring.

[0055] 2-4. The punch 20 extrudes and welds the ring to complete the molding process.

[0056] 2-5. After molding is completed, the upper mold mechanism returns to its original position along with the hydraulic equipment (not shown in the figure); at the same time, the hydraulic lower ejector cylinder (not shown in the figure) drives the connecting rod 16, the movable connecting column of the punch 21, and the punch 20 to return to their original positions.

[0057] 3. The forming action of forming fixture 300: All steps in the following text are completed within forming fixture 300.

[0058] 3-1. Place the pre-formed welding ring from forming fixture 200 into the mold cavity of forming fixture 300 (i.e., between the left and right forming blocks 9 inside forming fixture 300). The upper mold mechanism of the mold is positioned and guided downward by the limiting column.

[0059] 3-2. During the pressing process, the insert 22 of the forming fixture 300 presses down on the insert hole 23 of the forming fixture 300 and squeezes the forming guard block 9. The left and right forming guard blocks 9 move towards the middle for positioning. The pressing continues until the upper limit column closes the upper mold mechanism and the lower mold mechanism, and the mold is fully closed. The pressure block 19 of the forming fixture 300 also presses down on the welding ring, which plays a role in smoothing the plane.

[0060] 3-3. The hydraulic lower ejector cylinder (not shown in the figure) pushes upward, driving the connecting rod 16 of the forming tool 300 and the movable connecting column 21 of the punch to eject the punch 20; the forming tool 300 completes 90% to 100% of the plastic deformation of the welding ring.

[0061] 3-4. The punch 20 extrudes and welds the ring, completing the molding process.

[0062] 3-5. After molding is completed, the upper mold mechanism returns to its original position along with the hydraulic equipment (not shown in the figure); at the same time, the hydraulic lower ejector cylinder (not shown in the figure) drives the connecting rod 16, the movable connecting column of the punch 21, and the punch 20 to return to their original positions.

[0063] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A welding ring molding system, characterized in that, It includes several component tooling; the forming tooling includes an upper mold mechanism and a lower mold mechanism, wherein the upper mold mechanism is provided with a pressure block (19) at the middle position facing the lower mold mechanism, and the lower mold mechanism is provided with a punch (20) at the middle position facing the upper mold mechanism. The bottom of the punch (20) is connected to a drive assembly, and the top of the lower mold mechanism and located outside the punch (20) are provided with two sets of sliding forming guard blocks (9); Along the working direction, the dimensions of the pressure block (19), forming guard block (9) and punch (20) inside the several component tooling gradually increase.

2. The welding ring molding system according to claim 1, characterized in that: The upper mold mechanism includes an upper mold base (2), an upper pad (3), an upper pad plate (4), and an upper fixing plate (5). The upper mold base (2) and the upper pad plate (4) are connected by the upper pad (3). The bottom of the upper pad plate (4) is detachably connected to the upper fixing plate (5). The pressure block (19) is detachably installed at the middle position of the bottom of the upper fixing plate (5) facing the lower mold mechanism.

3. The welding ring molding system according to claim 2, characterized in that: The upper pad (4) has four corners at the bottom, where upper limit posts 1 (6) and upper limit posts 2 (7) that can pass through the upper fixed plate (5). The upper pad (4) has two sets of inserts (22) symmetrically arranged on both sides of the bottom, which can drive the molded protective block (9) to move relative to each other.

4. The welding ring molding system according to claim 1, characterized in that: The lower mold mechanism is provided with a pressure strip (8) on the top and outside of the forming guard block (9) for sliding and limiting its movement. The lower mold mechanism is provided with a slider seat (10) on the top and at the end of the forming guard block (9), and the slider seat (10) has a cutting groove on the side facing the forming guard block (9).

5. The welding ring molding system according to claim 1, characterized in that: The lower mold mechanism includes a lower template (11), a lower pad (12), a lower fixing plate (14), and a lower mold base (18). The lower template (11) is detachably connected to the lower pad (12). The four corners of the bottom of the lower template (11) are provided with lower limiting posts (13) that can pass through the lower pad (12). The bottom of the lower limiting posts (13) is connected to the lower fixing plate (14). The bottom of the lower fixing plate (14) is detachably connected to the lower mold base (18).

6. The welding ring molding system according to claim 5, characterized in that: A punch base (17) is provided between the lower pad (12) and the lower fixed plate (14). A punch movable connecting column (21) is slidably connected inside the punch base (17). The top of the punch movable connecting column (21) is detachably connected to the punch (20), and the bottom of the punch movable connecting column (21) is connected to a drive assembly.

7. The welding ring molding system according to claim 5, characterized in that: The drive assembly includes a connecting rod (16) and an external drive component. The connecting rod (16) passes through the bottom of the lower mold base (18) and the lower fixing plate (14) and is connected to the movable connecting post (21) of the punch.

8. The welding ring molding system according to claim 7, characterized in that: The outer side of the movable connecting column (21) of the punch is provided with a protrusion, and the inner slide groove of the punch base (17) is provided with a protrusion slide groove corresponding to the protrusion, and the protrusion can slide in the protrusion slide groove.

9. The welding ring molding system according to claim 5, characterized in that: The bottom of the lower mold base (18) is detachably fitted with mold feet (15).

10. A welding ring molding system according to claim 1, characterized in that: The molding fixtures in several groups include molding fixture one (100), molding fixture two (200) and molding fixture three (300); The forming tooling 1 (100) completes 40% to 70% of the plastic deformation of the welded ring; The forming tooling two (200) completes 70% to 90% of the plastic deformation of the welded ring; The forming fixture three (300) completes 90% to 100% of the plastic deformation of the welded ring.

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