A hydraulic forming die and method for pipe flanging

Abstract

This application discloses a hydraulic forming mold and method for pipe flanging, relating to the technical field of pipe stamping. The hydraulic forming mold for pipe flanging includes a worktable, a lower mold, an upper mold, a hydraulic cylinder, and a positioning device. The hydraulic forming method for pipe flanging includes the following steps: S1, selecting appropriate lower and upper molds according to the pipe dimensions; S2, hoisting and positioning the lower mold onto the support base; S3, placing the pipe on the lower mold; S4, after hoisting the upper mold above the support base, manually installing the upper mold onto the end of the piston rod of the hydraulic cylinder; S5, controlling the positioning assembly to position the pipe; S6, controlling the hydraulic cylinder to drive the upper mold downwards, completing the flaring and flanging at the opening of the pipe. This application can effectively improve the production efficiency and quality of UHV circuit breaker housings.

Description

Technical Field

[0001] This application relates to the technical field of pipe stamping, and in particular to a hydraulic forming die and method for pipe flanging. Background Technology

[0002] Pipes, or tubular materials, are widely used in construction projects, power plants, chemical plants, and other applications.

[0003] For example, the casing of an ultra-high voltage circuit breaker is generally cylindrical in shape and is usually formed from metal tubing. Because metal has high ductility, holes of suitable size (approximately elliptical) are pre-cut into the tubing at the desired flange extension location. Then, a hydraulic stretching forming mold is used to enlarge the holes. During this process, a circular hole of the required size is formed through the mold, while simultaneously forming an outwardly extending annular flange, ultimately resulting in the casing body of the ultra-high voltage circuit breaker of the required dimensions.

[0004] Because ultra-high voltage circuit breakers are the most complex and important electrical equipment in high-voltage equipment, with dual functions of control and protection, and are mainly used in important places such as ultra-high voltage substations, power plants, switching stations, transmission lines and power consumption lines, the quality requirements for ultra-high voltage circuit breakers are extremely high. As the protective shell of the ultra-high voltage circuit breaker serves as the outer shell for the internal key components, the requirements for its production efficiency and production quality are also gradually increasing. Summary of the Invention

[0005] This application provides a hydraulic forming mold and method for pipe flanging, which can effectively improve the production efficiency and quality of UHV circuit breaker housings.

[0006] On the one hand, this application provides a hydraulic forming die for pipe flanging, adopting the following technical solution: A hydraulic forming die for pipe flanging includes a worktable, a lower die, an upper die, a hydraulic cylinder, and a positioning device; The top of the workbench has a support base, the lower mold is detachably mounted on the top of the support base, and the support base has a clearance opening for the upper mold to pass through. The top of the lower mold has an arc-shaped surface for horizontal placement of the pipe, and has a forming opening for the upper mold to pass through and guide the pipe to be turned over, and the top of the forming opening forms an opening on the arc-shaped surface. The hydraulic cylinder is located at the bottom of the worktable and below the support base. The upper mold is detachably connected to the end of the piston rod of the hydraulic cylinder, and the hydraulic cylinder drives the upper mold to move through the clearance opening and the forming opening. The positioning device includes a positioning plate and several positioning components; The positioning plate is located near the end of the piston rod, and the positioning plate is adapted to the opening on the tube, and the upper mold is located above the positioning plate; when the positioning plate is engaged with the opening of the tube and the tube is in contact with the arc-shaped surface, the tube is positioned on the lower mold. The positioning assembly is disposed on the top of the lower mold, and includes two positioning members and a connecting structure disposed between the two positioning members; the positioning members are rotatably connected to the lower mold, and their rotation axis is parallel to the axis of the arc-shaped surface; when the tube is positioned on the lower mold, the positioning members rotate toward the tube and then contact and abut against the top of the tube; after both positioning members have contacted and abutted against the top of the tube, the connecting structure forms a connection between the two positioning members; It also includes a snap-fit ​​device; The snap-fit ​​device includes a snap-fit ​​block, the end of the piston rod has a snap-fit ​​portion, the snap-fit ​​block has a snap-fit ​​groove adapted to the snap-fit ​​portion, and the snap-fit ​​block engages with the snap-fit ​​portion in a direction perpendicular to the movement direction of the upper mold; when the snap-fit ​​block engages with the snap-fit ​​portion, the position of the upper mold between the snap-fit ​​block and the positioning plate is restricted.

[0007] By adopting the above technical solutions, the positional accuracy of the pipe after it is placed on the lower mold can be effectively improved. At the same time, the positional stability of the pipe during the hydraulic forming and flanging process can be effectively improved. Furthermore, it is convenient for workers to install the upper mold on the end of the piston rod, reducing the difficulty of operation and effectively improving work efficiency. Thus, the production efficiency and quality of the UHV circuit breaker casing can be effectively improved.

[0008] Optionally, the top of the upper mold has a groove for weight reduction, and when the snap-fit ​​block engages with the snap-fit ​​part, both the snap-fit ​​block and the snap-fit ​​part are located in the groove.

[0009] By adopting the above technical solution, the weight of the upper mold can be effectively reduced, thereby making it easier for staff to move the upper mold and complete its assembly and disassembly.

[0010] Optionally, when the upper mold contacts the snap-fit ​​block, there is a gap between the upper mold and the positioning plate.

[0011] By adopting the above technical solution, the upper mold can be initially installed at the end of the piston rod under the support of the positioning plate, and a space is formed in the groove to facilitate the worker to engage the snap-fit ​​block with the snap-fit ​​part, thereby further reducing the difficulty of disassembling and assembling the upper mold and further improving the efficiency of disassembling and assembling the upper mold.

[0012] Optionally, the upper mold has a clearance groove on the periphery of the groove near its opening. When the upper mold contacts the positioning plate, the locking block aligns with the clearance groove along its locking direction with the locking part, and the locking block moves into the clearance groove and then disengages from the locking part.

[0013] By adopting the above technical solution, the weight of the upper mold can be further reduced, while providing more space for the snap-fit ​​block and snap-fit ​​part to engage, thereby further reducing the difficulty of disassembling and assembling the upper mold and further improving the efficiency of disassembling and assembling the upper mold.

[0014] Optionally, the latching device further includes a plurality of locking components, and all of the plurality of locking components are disposed on the latching block; The locking component includes a locking element, an elastic element, and a trigger element; The locking member is movably connected to the latching block, and its end moves in and out of the latching groove. The latching part has a locking groove adapted to the locking member. The two ends of the elastic member are respectively connected to the locking member and the latching block. It has the tendency to drive the locking member to move into the interior of the latching block. After the end of the locking member is inserted into the locking groove, the latching block is locked relative to the latching part. The trigger is movably connected to the latching block by its own weight, and its bottom moves in and out of the bottom of the latching block, and contacts the locking member during its movement; when the locking member is inside the latching block, the trigger moves downward to its limit position; when the trigger moves upward to its limit position, the locking member is inserted into the locking slot.

[0015] By adopting the above technical solutions, the operation of disassembling and assembling the upper mold can be further standardized, and the positional stability of the upper mold during the hydraulic forming and flanging process of the pipe can be effectively improved. This ensures that the upper mold and the clamping block are subjected to uniform force during the process, extends the service life of the upper mold and the clamping block, and improves the safety of the hydraulic forming process.

[0016] Optionally, the upper mold has a positioning groove on the bottom wall of the groove. When the snap-fit ​​block and the snap-fit ​​part snap-fit ​​together to be centered in relative position and the trigger moves downward to the limit position, the bottom of the trigger is snapped into the positioning groove.

[0017] By adopting the above technical solution, it is possible to assist the staff in completing the operation of engaging the locking block and the locking part, further improving the positional accuracy of the locking block and the locking part after engagement, and at the same time, effectively reducing the probability of the positional accuracy being reduced due to external force factors such as accidental contact after the locking block and the locking part have been engaged accurately.

[0018] Optionally, the two positioning elements in the same positioning assembly are staggered along the axial direction of the arcuate surface.

[0019] By adopting the above technical solution, the probability of positional interference during the rotation of the two positioning components can be reduced, thereby facilitating the positioning assembly to position pipes of different sizes.

[0020] Optionally, the positioning component further includes two movable parts, which are movably disposed on the positioning component and whose direction of movement is parallel to the rotation axis of the positioning component; each movable part has a resistance-increasing surface on the side near the other movable part, and the two resistance-increasing surfaces come into contact and abut after the two movable parts move toward each other. The connection structure includes a connector and a tightening member; the tightening member is elastic, with its two ends connected to the ends of the connector and the positioning member respectively, and it has a tendency to drive the ends of the connector and the positioning member to maintain contact and abutment; the movable member has a connecting portion at the end away from the corresponding tightening member, the connector and the connecting portion are detachably connected, and the tightening member drives the movable member to move towards the other movable member and drives the other positioning member to rotate to strengthen the positioning of the pipe through the connector.

[0021] By adopting the above technical solution, it is possible for workers to easily connect the two positioning components through the connecting structure. At the same time, it can effectively improve the positioning effect of the positioning component on the pipe and effectively improve the positional stability of the pipe after positioning to ensure the effect of subsequent hydraulic forming and flanging.

[0022] On the other hand, this application also provides a hydroforming method for pipe flanging, which adopts the following technical solution: A hydroforming method for pipe flanging, based on the aforementioned hydroforming mold for pipe flanging, includes the following steps: S1. Select appropriate lower and upper molds according to the dimensions of the pipe; S2. Hoist the lower mold onto the support base for installation and positioning; S3. Place the pipe on the lower mold, so that the bottom of the pipe contacts the arc-shaped surface and its opening matches the positioning plate; S4. After hoisting the upper mold above the support base, manually place the upper mold into the inside of the pipe, and then install the upper mold on the end of the piston rod of the hydraulic cylinder; S5. Control the positioning component to position the tube placed above the lower mold; S6. Control the hydraulic cylinder to drive the upper mold downward to complete the flaring and flanging at the opening of the tube.

[0023] In summary, this application includes at least one of the following beneficial effects: 1. It can effectively improve the positional accuracy of the pipe after it is placed on the lower mold, and at the same time, it can effectively improve the positional stability of the pipe during the hydraulic forming and flanging process, thereby effectively improving the production efficiency and quality of the UHV circuit breaker housing; 2. It can effectively reduce the difficulty of disassembling and assembling the upper mold and improve the efficiency of disassembling and assembling the upper mold, thereby further improving the production efficiency of the UHV circuit breaker shell; 3. It can effectively extend the service life of the upper mold and the snap-fit ​​block, and at the same time, it can effectively improve the safety during the hydroforming process; 4. It can effectively improve the positional stability of the pipe after it is positioned on the lower mold, thereby effectively ensuring the effect of subsequent hydraulic forming and flanging of the pipe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a hydraulic forming mold for pipe flanging, as shown in Example 1. Figure 2 This is a cross-sectional view along the width direction of a hydraulic forming die for pipe flanging, as described in Example 1. Figure 3 This is a cross-sectional view along the length of a hydraulic forming die for pipe flanging, as described in Example 1. Figure 4 This is a schematic diagram of the structure of a hydraulic forming mold for pipe flanging, as shown in Example 2. Figure 5 This is a partial top view of the positioning component after positioning the pipe in Embodiment 2; Figure 6 This is a cross-sectional view along the width direction of a hydraulic forming die for pipe flanging, as described in Embodiment 2. Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0025] Explanation of reference numerals in the attached drawings: 1. Workbench; 11. Support base; 111. Relief opening; 2. Lower mold; 21. Arc-shaped surface; 22. Forming opening; 3. Upper mold; 31. Groove; 32. Relief groove; 33. Positioning groove; 4. Hydraulic cylinder; 41. Piston rod; 411. Snap-fit ​​part; 4111. Locking groove; 5. Positioning device; 51. Positioning plate; 52. Positioning assembly; 521. Positioning component; 522. Connecting structure; 5221. Tightening component; 5222. Connecting component; 523. Moving part; 5231. Resistance-increasing surface; 5232. Connecting part; 6. Snap-fit ​​device; 61. Snap-fit ​​block; 611. Snap-fit ​​groove; 62. Locking assembly; 621. Locking component; 622. Elastic component; 623. Triggering component; 7. Pipe. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail. Example 1

[0027] Reference Figure 1 and Figure 2 This application discloses a hydraulic forming mold for flanged pipe, used to flare and flange the perforated pipe 7 to obtain the main body of the housing of an ultra-high voltage circuit breaker. In this embodiment, preferably, there are two perforations on the pipe 7, which are located on both sides of the same radial direction and aligned along that radial direction.

[0028] Reference Figure 2 and Figure 3 The hydraulic forming mold includes a workbench 1 for raising the processing area, a lower mold 2 for placing the pipe 7, an upper mold 3 for flaring and flangering the opening of the pipe 7, a hydraulic cylinder 4 for driving the upper mold 3 to move, and a positioning device 5 for facilitating the positioning of the pipe 7 on the lower mold 2 and improving its positional stability during the hydraulic forming process.

[0029] The top of the workbench 1 is provided with a support base 11 for mounting the lower mold 2. The top surface of the support base 11 is horizontal, and the lower mold 2 is detachably mounted on the top of the support base 11. In this embodiment, it is preferable that both the support base 11 and the lower mold 2 are rectangular in shape. The top of the lower mold 2 has an arc-shaped surface 21 for placing the pipe 7 in a horizontal position. The length direction of the support base 11 is parallel to the length direction of the arc-shaped surface 21, and the width direction of the support base 11 is parallel to the width direction of the arc-shaped surface 21. Preferably, the lower mold 2 is detachably connected to the support base 11 by multiple bolts.

[0030] A clearance opening 111 is vertically oriented through the center of the support base 11, and the clearance opening 111 is used for the upper mold 3 to pass through during movement. In this embodiment, the clearance opening 111 is preferably circular, the upper mold 3 is generally truncated cone structure, and the radial dimension of the clearance opening 111 is larger than the radial dimension of the upper mold 3.

[0031] After the pipe 7 is placed on the lower mold 2, the axis of the pipe 7 will be parallel to the axis of the arc surface 21, and the bottom of the pipe 7 will contact and abut against the arc surface 21. A forming opening 22 is also vertically penetrating the center of the lower mold 2. The forming opening 22 is for the upper mold 3 to pass through, and its inner wall guides the upper mold 3 to flare and enlarge the opening of the pipe 7. Its top forms an opening on the arc surface 21, and its bottom communicates with the space below the support base 11 of the workbench 1. The forming opening 22 is circular, with a radial dimension greater than that of the upper mold 3 and less than that of the relief opening 111. After the lower mold 2 is installed on the support base 11, the axes of the forming opening 22 and the relief opening 111 coincide, and the forming opening 22 and the relief opening 111 are aligned along the movement direction of the upper mold 3. In this embodiment, preferably, the axial direction of the arc surface 21 is parallel to the length direction of the lower mold 2, and the radial dimension of the arc surface 21 is not less than the radial dimension of the pipe 7.

[0032] Hydraulic cylinder 4 is fixedly installed at the bottom of workbench 1, located below support base 11, and aligned with the axis of relief opening 111. The top of hydraulic cylinder 4 has a piston rod 41 that can move vertically, and the top of piston rod 41 can pass through relief opening 111 and forming opening 22 during movement. Upper mold 3 is detachably installed on the top of piston rod 41; after installation, its axis coincides with the axis of relief opening 111, and its conical surface contracts downwards. In this embodiment, since hydraulic cylinder 4 with the above functions is common prior art, it will not be described in detail here, and only a brief representation is given in the accompanying drawings.

[0033] The positioning device 5 includes a positioning plate 51 for assisting the upper mold 3 in being disassembled and assembled on the piston rod 41 and for assisting the tube 7 in being accurately placed on the lower mold 2. The upper mold 3 and the piston rod 41 are quickly disassembled and assembled through a snap-fit ​​device 6.

[0034] The cross-sectional shape of the positioning plate 51 is adapted to the cross-sectional shape of the opening on the pipe 7. It is detachably installed on the piston rod 41 near its top, and it has space in the direction near the top of the piston rod 41 for detachable connection between the upper mold 3 and the piston rod 41. Before the pipe 7 is placed on the lower mold 2, the hydraulic cylinder 4 drives the piston rod 41 to move so that the positioning plate 51 is above and close to the forming opening 22. Then the pipe 7 can be placed on the lower mold 2 by aligning the positioning plate 51 with the opening, which effectively improves the positional accuracy of the pipe 7 after it is placed on the lower mold 2. In this embodiment, the edge of the preferred positioning plate 51 has a chamfer to facilitate its passage through the opening of the pipe 7, and the preferred positioning plate 51 is detachably connected to the piston rod 41 by bolts; since the main body of the UHV circuit breaker housing has different size requirements, the upper mold 3, the lower mold 2 and the positioning plate 51 are preferably used in a matching set, and the hydraulic forming mold has a variety of sizes and specifications of upper mold 3, lower mold 2 and positioning plate 51 for workers to select and use according to their needs.

[0035] The snap-fit ​​device 6 includes a snap-fit ​​block 61, which is cylindrical in shape and has a snap-fit ​​groove 611 extending through it in its radial direction. The top of the piston rod 41 has a snap-fit ​​part 411 that matches the snap-fit ​​groove 611. After the snap-fit ​​block 61 aligns with the snap-fit ​​part 411 in its radial direction, it can move in its radial direction to snap-fit ​​the snap-fit ​​block 61 with the snap-fit ​​part 411. When the snap-fit ​​block 61 snaps-fits with the snap-fit ​​part 411, the position of the upper mold 3 is restricted between the snap-fit ​​block 61 and the positioning plate 51, thereby realizing the quick connection between the upper mold 3 and the piston rod 41.

[0036] Since the upper mold 3 needs to be manually moved in and out of the internal space of the pipe 7 during the disassembly and assembly process, in order to reduce the weight of the upper mold 3 and facilitate manual handling and disassembly operations, it is preferable that the top of the upper mold 3 has a groove 31, and the groove 31 also provides sufficient operating space for the snap-fit ​​block 61 and the snap-fit ​​part 411 to snap into place.

[0037] Before the snap-fit ​​block 61 engages with the snap-fit ​​part 411, the upper mold 3 is initially installed on the top of the piston rod 41 with the help of the positioning plate 51. While it is fitted with the piston rod 41, its bottom contacts and abuts against the positioning plate 51. At this time, the snap-fit ​​part 411 is located in the groove 31 near its opening, which makes it easy for the operator to put the snap-fit ​​block 61 into the groove 31 and complete the snap-fit ​​engagement with the snap-fit ​​part 411. After the upper mold 3 is installed on the piston rod 41, when it is not used to flare and bevele the pipe 7, the upper mold 3 will maintain contact and abut against the positioning plate 51 under its own gravity. When it is used to flare and bevele the pipe 7, the upper mold 3 will be subjected to the reaction force of the pipe 7 and move towards the snap-fit ​​block 61 relative to the piston rod 41 until it contacts and abuts against the snap-fit ​​block 61, and maintain the current position to complete the hydraulic forming of the pipe 7.

[0038] To further reduce the weight of the upper mold 3 and further reduce the operational difficulty of engaging the snap-fit ​​block 61 and the snap-fit ​​part 411, it is preferable that the upper mold 3 also has a relief groove 32 on the periphery of the groove 31 near its opening.

[0039] When the bottom of the upper mold 3 comes into contact with the positioning plate 51, the snap-fit ​​part 411 can align with the relief groove 32 in the horizontal direction. When the snap-fit ​​block 61 is placed in the relief groove 32 and its bottom wall is flush with the bottom wall of the relief groove 32, it can complete the snap-fit ​​engagement with the snap-fit ​​part 411 in the horizontal direction. The snap-fit ​​block 61 that engages with the snap-fit ​​part 411 can also separate from the snap-fit ​​part 411 in the horizontal direction and enter the relief groove 32.

[0040] During the process of the upper mold 3 flaring and flanging the opening of the tube 7, the positional stability of the tube 7 on the lower mold 2 will affect the final quality of the hydroforming of the tube 7. Therefore, the positioning device 5 also includes several positioning components 52 for improving the positional stability of the tube 7 on the lower mold 2. In this embodiment, the positioning device 5 preferably includes two positioning components 52.

[0041] Positioning components 52 are installed on the top of the lower mold 2, and the two positioning components 52 are located at both ends of the length direction of the lower mold 2. The positioning components 52 include two positioning parts 521 and a connecting structure 522. The positioning parts 521 are generally arc-shaped strip structures, one end of which is rotatably connected to the top of the lower mold 2. The axis of rotation is parallel to the length direction of the lower mold 2, and the rotatable connection positions of the two positioning parts 521 and the lower mold 2 are close to the two ends of the arc trajectory of the arc surface 21. When the pipe 7 is accurately placed on the lower mold 2 and both positioning parts 521 are rotated to contact and abut against the top of the pipe 7, there is a gap between the two positioning parts 521. The connecting structure 522 will form a connection between the ends of the two positioning parts 521, so that the two positioning parts 521 can maintain their current position state, thereby improving the positional stability of the pipe 7 on the lower mold 2. In this embodiment, it is preferred that the two positioning members 521 in the same positioning component 52 are aligned along the width direction of the lower mold 2, and there is no positional interference during the rotation of the two positioning members 521; and it is preferred that the connection structure 522 is a quick-lock, which makes it easy for the staff to quickly form or disengage the connection between the two positioning members 521 as needed; since the quick-lock with the above function is a common prior art, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.

[0042] The implementation principle of a hydraulic forming die for pipe flanging in this application embodiment is as follows: After selecting the appropriate upper mold 3, lower mold 2, and positioning plate 51 according to the required size of the pipe 7 to be hydraulically formed, first install the positioning plate 51 on the piston rod 41, and then install the lower mold 2 on the support base 11; next, place the pipe 7 on the lower mold 2, ensuring that the opening of the pipe 7 matches the positioning plate 51 during placement, so that the pipe 7 can be accurately positioned on the lower mold 2; then, manually move the upper mold 3 into the internal space of the pipe 7, and quickly install the upper mold 3 on the top of the piston rod 41 through the snap-fit ​​device 6; then, operate the positioning component 52 so that the two corresponding positioning parts 521 rotate to contact and abut against the top of the pipe 7, and then maintain the current position of the two positioning parts 521 through the connecting structure 522 to ensure the positional stability of the pipe 7 during the subsequent hydraulic forming process; finally, control the hydraulic cylinder 4 to drive the upper mold 3 downward to pass through the forming opening 22 and the clearance opening 111 in sequence, thus completing the flaring and flange of the pipe 7 at the opening. Example 2

[0043] Reference Figure 4 The difference between this embodiment and embodiment 1 lies in the positioning component 52 and the snap-fit ​​device 6, which can further facilitate the disassembly and assembly of the upper mold 3 by the staff and can effectively ensure the positional accuracy of the upper mold 3 after installation, thereby extending the service life of the upper mold 3 and the snap-fit ​​device 6. At the same time, it can further improve the positional stability of the pipe 7 on the lower mold 2 to ensure the quality of subsequent hydraulic forming of the pipe 7.

[0044] Reference Figure 4 and Figure 5 In the same set of positioning components 52, the two positioning elements 521 are staggered along their own rotation axis. After both positioning elements 521 rotate to contact and abut the top of the tube 7, there is an overlap between the two positioning elements 521 along their own rotation axis (positions of the positioning elements 521 away from the lower mold 2). At this time, the two positioning elements 521 can effectively avoid mutual interference during rotation and can accommodate more tubes 7 of different sizes.

[0045] Furthermore, the preferred positioning component 52 also includes two movable parts 523, which correspond one-to-one with the two positioning parts 521, and the movable parts 523 are movably mounted on the corresponding positioning parts 521. The movable parts 523 are generally arc-shaped plate structures, and their direction of movement is parallel to the rotation axis of the positioning parts 521. During their movement, they can move in and out of the corresponding positioning parts 521 to the side near the other positioning part 521. In this embodiment, the arc trajectory of the preferred movable part 523 is the same as the arc trajectory of the positioning parts 521; when the movable part 523 moves inward relative to the corresponding positioning part 521 to its limit position, the movable part 523 is exactly completely inside the positioning part 521; when the movable part 523 moves outward relative to the corresponding positioning part 521 to its limit position, the movable part 523 moves closer to the other positioning part 521.

[0046] One side of the movable member 523 has a resistance-increasing surface 5231 for contacting another movable member 523. During the outward movement of both movable members 523 relative to their corresponding positioning members 521, the two movable members 523 will contact and abut against each other through the resistance-increasing surfaces 5231. At this time, the resistance between the two resistance-increasing surfaces 5231 will effectively inhibit the rotation of the two positioning members 521, thereby allowing the two positioning members 521 to maintain their current position. In this embodiment, the resistance-increasing surface 5231 is preferably a frosted, rough surface, so that the above-mentioned effect can be achieved after the two resistance-increasing surfaces 5231 come into contact.

[0047] Each positioning element 521 has a connecting structure 522 installed at the end away from the lower mold 2, so as to form a connection between it and the corresponding other positioning element 521, and the connecting structure 522 includes a connecting element 5222 and a tightening element 5221.

[0048] The tightening member 5221 is elastic, and its two ends are fixedly connected to the connecting member 5222 and the end of the positioning member 521 away from the lower mold 2, respectively. It always has a tendency to drive the connecting member 5222 towards the end of the positioning member 521 away from the lower mold 2 and maintain contact with that end. In this embodiment, the tightening member 5221 is preferably an elastic rope. When the connecting member 5222 is not subjected to external force, it will contact the end of the corresponding positioning member 521 away from the lower mold 2 under the force of the tightening member 5221. After being subjected to external force, the connecting member 5222 will overcome the force of the tightening member 5221 and move towards the end away from the corresponding positioning member 521 and away from the lower mold 2.

[0049] The movable part 523 has a connecting portion 5232 on one side of the resistance-increasing surface 5231 near the lower mold 2, which is used to connect the connecting part 5222 to it, and the connecting part 5222 and the connecting portion 5232 are detachably connected. In this embodiment, the connecting part 5222 preferably has a hook structure, and the connecting portion 5232 is preferably a hanging ring for the hook structure.

[0050] After the connection is formed between the connector 5222 and the connecting part 5232, the tightening force of the tightening member 5221 will drive the two moving members 523 to move towards each other until the two resistance increasing surfaces 5231 come into contact and abut. At the same time, it can also drive the two positioning members 521 to rotate further to improve their positioning effect on the tube 7 placed on the lower mold 2.

[0051] Reference Figure 6 and Figure 7 During the flaring and flange-making process of pipe 7, the upper mold 3, the snap-fit ​​block 61, and the snap-fit ​​part 411 mainly bear the reaction force. If the snap-fit ​​block 61 and the snap-fit ​​part 411 are misaligned after snap-fitting, it is easy to cause uneven force on the upper mold 3, the snap-fit ​​block 61, and the snap-fit ​​part 411, which can easily lead to serious damage to the upper mold 3, the snap-fit ​​block 61, and the snap-fit ​​part 411, affecting the safety of the processing.

[0052] Therefore, it is necessary to improve the positional stability of the latching block 61 and the latching part 411 after they are engaged. Thus, the latching device 6 further includes multiple locking components 62 for improving the relative positional stability of the latching block 61 and the latching part 411 after they are engaged, and the locking components 62 are mounted on the latching block 61. In this embodiment, preferably, two locking components 62 are mounted on the latching block 61, and the two locking components 62 are symmetrically distributed on the latching block 61.

[0053] The locking component 62 includes a locking element 621, an elastic element 622, and a trigger element 623.

[0054] The locking member 621 is movably connected to the latching block 61, and its direction of movement is perpendicular to the axis of the latching block 61. One end of the locking member 621 can move in and out of the latching groove 611, and the latching part 411 is provided with a corresponding locking groove 4111 that matches the end of the locking member 621. The two ends of the elastic member 622 are fixedly connected to the locking member 621 and the latching block 61, respectively, and it has the tendency to drive the locking member 621 to move to its limit position in a direction away from the latching groove 611. When the locking member 621 moves to its limit position in a direction away from the latching groove 611, the locking member 621 will be completely located inside the latching block 61; when the locking member 621 moves to its limit position in a direction close to the latching groove 611, the part of the locking member 621 located in the latching groove 611 can be precisely inserted into the locking groove 4111 to achieve locking. When the latching block 61 engages with the latching part 411 and is accurately centered, if the end of the locking member 621 is inserted into the locking groove 4111, the position of the latching block 61 relative to the latching part 411 is locked and cannot be easily separated. In this embodiment, the elastic member 622 is preferably a compression spring.

[0055] The trigger 623 is movably connected to the latching block 61. Its direction of movement is parallel to its own length and the axis of the latching block 61, and it moves relative to the latching block 61 under its own weight. During the movement of the trigger 623 relative to the latching block 61, its bottom can move in and out of the space below the latching block 61, and at the same time, it can contact the end of the corresponding locking member 621 away from the latching groove 611, driving the locking member 621 to move. When the locking member 621 moves to its limit position away from the latching groove 611 and the trigger 623 moves downward to its limit position under its own weight, a distance is maintained between them; when the trigger 623 moves upward to its limit position, it will contact the end of the locking member 621 away from the latching groove 611 and drive the locking member 621 to overcome the force of the elastic member 622 and move towards the latching groove 611 to its limit position. In this embodiment, preferably, the trigger 623 drives the locking member 621 to move after its own wedge structure comes into contact with the wedge structure on the locking member 621.

[0056] The upper mold 3 has a positioning groove 33 on the bottom wall of the groove 31 that is adapted to the bottom of the trigger 623. The positioning groove 33 is annular and its axis coincides with the axis of the upper mold 3.

[0057] When the locking block 61 and the locking part 411 are about to engage, the trigger 623 will move downwards under its own weight until its bottom contacts and abuts against the bottom wall of the groove 31. At this time, the locking block 61 can smoothly engage with the locking part 411. When the locking block 61 and the locking part 411 are engaged to the point that the bottom of the trigger 623 is aligned with the positioning groove 33 along its own movement direction, the trigger 623 will continue to move downwards under its own weight until its bottom engages with the positioning groove 33. At this time, the trigger 623 will restrict the movement of the locking block 61 relative to the locking part 411, and the locking member 621 is aligned with the corresponding locking groove 4111 along its own movement direction. At this time, the upper mold 3 is in the position to be used to flare and flange the opening of the pipe 7. At this time, the bottom of the upper mold 3 is in contact with the positioning plate 51, and the upper mold 3 is located above the positioning plate 51. There is space between the locking blocks 61 for them to move relative to the piston rod 41 towards the locking blocks 61; then, during the process of the upper mold 3 flaring and flanging the opening of the pipe 7, the piston rod 41 will move downward. In the early stage, because the piston rod 41 fails to contact the upper mold 3 through the locking blocks 61 to apply a downward force to the upper mold 3, the upper mold 3 will move relative to the piston rod 41 towards the locking blocks 61 until it contacts and abuts against the locking blocks 61. During this process, the trigger 623 will move upward to the limit position under the force of the upper mold 3. When the trigger 623 is about to move upward to the limit position, it will contact the locking member 621, so that the locking member 621 will subsequently move to complete the locking; after that, the piston rod 41 can be released from the upper mold 3 through the locking blocks 61, and then the upper mold 3 can be driven to move downward to flare and flang the opening of the pipe 7.

[0058] The implementation principle of a hydraulic forming die for pipe flanging in this application embodiment is as follows: During the installation of the upper mold 3 on the piston rod 41, the snap-fit ​​block 61 and the snap-fit ​​part 411 snap-fit ​​together until the bottom of the trigger 623 is engaged in the positioning groove 33, thus enabling the snap-fit ​​block 61 and the snap-fit ​​part 411 to complete the snap-fit ​​engagement and be centered relative to each other. Furthermore, during the subsequent process of the upper mold 3 flaring and flangering the opening of the pipe 7, the trigger 623 will be moved upward by the force of the upper mold 3 to the limit position, triggering the locking part 621 to move, thereby locking the position between the snap-fit ​​block 61 and the snap-fit ​​part 411. This improves the relative positional stability of the upper mold 3, the snap-fit ​​block 61, and the snap-fit ​​part 411 during this process, extends the service life of the upper mold 3, the snap-fit ​​block 61, and the snap-fit ​​part 411, and improves the safety of the hydroforming process. After the pipe 7 is accurately placed on the lower mold 2, the positioning component 52 positions the pipe 7. First, the two positioning components 521 are rotated until they contact and abut the top of the pipe 7. Then, the connecting component 5222 is connected to the connecting part 5232 on the corresponding movable component 523. At this time, the two movable components 523 will move towards each other so that the two resistance surfaces 5231 contact and abut. At the same time, the two positioning components 521 will also rotate further to improve their positioning effect on the pipe 7, thereby effectively ensuring the positional stability of the pipe 7 during the hydraulic forming process and improving the final quality of the hydraulic forming of the pipe 7. Example 3

[0059] Reference Figure 1 and Figure 3 This application discloses a hydraulic forming method for pipe flanging, based on a hydraulic forming mold for pipe flanging as disclosed in Embodiment 1, enabling the pipe 7 to be flared and flanged at the opening to obtain the required extended structure, ultimately obtaining the main body of the UHV circuit breaker housing of the required size, including the following steps: S1. Select appropriate lower mold 2 and upper mold 3 according to the size of pipe 7.

[0060] Based on the size of the pipe 7 to be processed and the processing requirements, select appropriate lower mold 2, upper mold 3 and positioning plate 51, and pre-install the positioning plate 51 on the piston rod 41 of the hydraulic cylinder 4.

[0061] S2. Hoist the lower mold 2 onto the support base 11 for installation and positioning.

[0062] The lower mold 2 is hoisted onto the support base 11 using hoisting equipment, and then fixedly connected to the support base 11 after positioning.

[0063] S3. Place the pipe 7 on the lower mold 2 so that the bottom of the pipe 7 contacts the arc surface 21 and its opening matches the positioning plate 51.

[0064] The pipe 7 to be processed is hoisted onto the lower mold 2 using hoisting equipment, so that it is accurately placed on the lower mold 2 by the positioning plate 51. At this time, the bottom of the pipe 7 will contact and abut against the arc surface 21, and its opening will be in cooperation with the positioning plate 51.

[0065] S4. After hoisting the upper mold 3 above the support base 11, manually place the upper mold 3 into the inside of the pipe 7, and then install the upper mold 3 on the end of the piston rod 41 of the hydraulic cylinder 4.

[0066] After the upper mold 3 is hoisted to the top of the support base 11 by the hoisting equipment, the workers carry the upper mold 3 into the internal space of the pipe 7, and install the upper mold 3 on the top of the piston rod 41 by the snap-fit ​​device 6.

[0067] S5, the control positioning component 52 positions the pipe 7 placed above the lower mold 2.

[0068] Multiple positioning components 52 are operated so that the positioning element 521 contacts and abuts against the top of the tube 7 and remains in place, thereby improving the positional stability of the tube 7 placed on the lower mold 2.

[0069] S6. Control the hydraulic cylinder 4 to drive the upper mold 3 downward to complete the flaring and flange at the opening of the tube 7.

[0070] The hydraulic cylinder 4 drives the piston rod 41 to move downward, which in turn moves the upper mold 3 downward. During the movement, the upper mold 3 passes through the forming opening 22 and the relief opening 111 in sequence. During this process, the upper mold 3 will complete the flaring and flange of the opening of the tube 7.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydraulic forming die for tube flanging, characterized by, It includes a worktable (1), a lower mold (2), an upper mold (3), a hydraulic cylinder (4), and a positioning device (5); the top of the worktable (1) has a support base (11), the lower mold (2) is detachably mounted on the top of the support base (11), and the support base (11) has a clearance opening (111) for the upper mold (3) to pass through; the top of the lower mold (2) has an arc-shaped surface (21) for the pipe (7) to be placed horizontally, and it has a forming opening (22) for the upper mold (3) to pass through and guide the pipe (7) to be turned over, and the top of the forming opening (22) forms an opening on the arc-shaped surface (21); The hydraulic cylinder (4) is located at the bottom of the workbench (1) and below the support base (11). The upper mold (3) is detachably connected to the end of the piston rod (41) of the hydraulic cylinder (4). The hydraulic cylinder (4) drives the upper mold (3) to move through the relief opening (111) and the forming opening (22). The positioning device (5) includes a positioning plate (51) and several positioning components (52). The positioning plate (51) is located near the end of the piston rod (41). The positioning plate (51) is adapted to the opening on the tube (7). The upper mold (3) is located above the positioning plate (51). When the positioning plate (51) is inserted into the opening of the tube (7) and the tube (7) contacts the arc surface (21), the tube (7) is positioned on the lower mold (2). The positioning component (52) is disposed on the top of the lower mold (2), and includes two positioning parts (521) and a connecting structure (522) disposed between the two positioning parts (521); the positioning parts (521) are rotatably connected to the lower mold (2), and their rotation axis is parallel to the axis of the arc surface (21); when the tube (7) is positioned on the lower mold (2), the positioning parts (521) rotate toward the tube (7) and then contact and abut against the top of the tube (7); after both positioning parts (521) contact and abut against the top of the tube (7), the connecting structure (522) forms a connection between the two positioning parts (521); it also includes a snap-fit ​​device (6); The snap-fit ​​device (6) includes a snap-fit ​​block (61), and the end of the piston rod (41) has a snap-fit ​​part (411). The snap-fit ​​block (61) has a snap-fit ​​groove (611) adapted to the snap-fit ​​part (411), and the snap-fit ​​block (61) engages with the snap-fit ​​part (411) in a direction perpendicular to the movement direction of the upper mold (3). When the snap-fit ​​block (61) engages with the snap-fit ​​part (411), the position of the upper mold (3) between the snap-fit ​​block (61) and the positioning plate (51) is restricted. The two positioning elements (521) in the same positioning assembly (52) are staggered along the axial direction of the arc surface (21); The positioning component (52) further includes two movable parts (523), which are movably disposed on the positioning component (521) and whose direction of movement is parallel to the rotation axis of the positioning component (521); the movable part (523) has a resistance-increasing surface (5231) on the side of the other movable part (523), and the two resistance-increasing surfaces (5231) come into contact and abut after the two movable parts (523) move toward each other; The connection structure (522) includes a connector (5222) and a tightening member (5221); the tightening member (5221) is elastic, and its two ends are respectively connected to the ends of the connector (5222) and the positioning member (521), and it has a tendency to drive the ends of the connector (5222) and the positioning member (521) to keep in contact and abut against each other; the movable member (523) has a connecting part (5232) at one end away from the corresponding tightening member (5221), the connector (5222) and the connecting part (5232) are detachably connected, and the tightening member (5221) drives the movable member (523) to move toward the other movable member (523) through the connector (5222) and drives the other positioning member (521) to rotate to strengthen the positioning of the pipe (7).

2. A hydraulic forming die for flanging a tube as defined in claim 1, wherein The top of the upper mold (3) has a groove (31) for weight reduction. When the snap-fit ​​block (61) and the snap-fit ​​part (411) are snapped together, both the snap-fit ​​block (61) and the snap-fit ​​part (411) are located in the groove (31).

3. A hydraulic forming die for flanging a tube as defined in claim 2, wherein, When the upper mold (3) contacts the snap-fit ​​block (61), there is a gap between the upper mold (3) and the positioning plate (51).

4. A hydraulic forming die for pipe flanging according to claim 3, characterized in that, The upper mold (3) has a relief groove (32) on the periphery of the groove (31) near its opening. When the upper mold (3) contacts the positioning plate (51), the snap-fit ​​block (61) is aligned with the relief groove (32) along its snap-fit ​​direction with the snap-fit ​​part (411), and the snap-fit ​​block (61) is released from the snap-fit ​​engagement with the snap-fit ​​part (411) after it moves into the relief groove (32).

5. A hydraulic forming die for pipe flanging according to claim 4, characterized in that, The latching device (6) further includes multiple locking components (62), and the multiple locking components (62) are all disposed on the latching block (61); the locking component (62) includes a locking member (621), an elastic member (622), and a trigger member (623); the locking member (621) is movably connected to the latching block (61), and its end moves in and out of the latching groove (611), and the latching part (411) is provided with a locking groove (4111) adapted to the locking member (621); the two ends of the elastic member (622) are respectively connected to the locking member (621) and the latching block (61), and it has the tendency to drive the locking member (621) to move into the interior of the latching block (61), and after the end of the locking member (621) is inserted into the locking groove (4111), the position of the latching block (61) relative to the latching part (411) is locked; The trigger (623) is movably connected to the latching block (61) by its own weight, and its bottom moves in and out of the bottom of the latching block (61), and it contacts the locking member (621) during its movement; when the locking member (621) is inside the latching block (61), the trigger (623) moves downward to the limit position; when the trigger (623) moves upward to the limit position, the locking member (621) is inserted into the locking groove (4111).

6. A hydraulic forming die for pipe flanging according to claim 5, characterized in that, The upper mold (3) has a positioning groove (33) on the bottom wall of the groove (31). When the snap-fit ​​block (61) and the snap-fit ​​part (411) are snap-fitted together to be centered in relative position and the trigger (623) moves downward to the limit position, the bottom of the trigger (623) is snapped into the positioning groove (33).

7. A hydroforming method for pipe flanging, based on a hydroforming mold for pipe flanging as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Select the appropriate lower mold (2) and upper mold (3) according to the size of the pipe (7); S2. Hoist the lower mold (2) onto the support base (11) for installation and positioning; S3. Place the pipe (7) on the lower mold (2) so that the bottom of the pipe (7) contacts the arc surface (21) and its opening matches the positioning plate (51); S4. After hoisting the upper mold (3) above the support base (11), manually place the upper mold (3) into the inside of the pipe (7) and install the upper mold (3) on the end of the piston rod (41) of the hydraulic cylinder (4); S5. Control the positioning component (52) to position the pipe (7) placed above the lower mold (2); S6. Control the hydraulic cylinder (4) to drive the upper mold (3) downward to complete the flaring and flanging at the opening of the pipe (7).

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