Cold extrusion die for asymmetric copper alloy long three-way pipe fitting

Abstract

The invention belongs to the technical field of copper alloy pipe fitting machining dies, and particularly relates to an asymmetric copper alloy long three-way pipe fitting cold extrusion die which comprises an upper die assembly, a lower die assembly, core rod assemblies and a demolding assembly, the upper die assembly and the lower die assembly are correspondingly arranged up and down, and the core rod assemblies are located on the two sides of the upper die assembly and the lower die assembly; one end of the core rod assembly extends into a forming cavity formed by the upper mold assembly and the lower mold assembly, the demolding assembly is installed at the bottom of the lower mold assembly, and a linkage mechanism is arranged between the core rod assembly and the demolding assembly. And when the core rod assembly is far away from the upper mold assembly and the lower mold assembly, the pipe fitting in the forming cavity is demolded through a linkage mechanism, and a detachable insert assembly is arranged in the lower mold assembly. According to the device, an additional demolding power source is omitted, the action synchronism of core rod withdrawing and pipe demolding is ensured, and the problem that the surface of the pipe is scratched or deformed due to friction generated when the core rod withdraws is effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of copper alloy pipe fitting machining die, and relates to a cold extrusion die for asymmetric copper alloy long tee pipe fitting. BACKGROUND

[0002] The cold extrusion and water expansion forming composite technology is widely applied in the field of copper alloy pipe fitting manufacturing due to high precision, high material utilization rate and excellent product mechanical properties. The water expansion forming can realize accurate forming of complex cavities by the action of high-pressure water provided by a water expansion machine on the inner wall of a pipe fitting blank, and is especially suitable for the machining of asymmetric structure pipe fittings. The asymmetric copper alloy long tee pipe fitting is widely applied in heating, ventilation, water supply and drainage and refrigeration systems due to special fluid distribution function. The structural characteristics of the pipe fitting are that the main pipe is long, the branch pipes are asymmetrically distributed with the main pipe, and the pipe fitting is thin-walled and high in size precision. The existing forming die matched with the water expansion machine has the following technical defects when machining the pipe fitting: firstly, the demolding structure of the die is not perfect, the asymmetric long tee pipe fitting is highly fitted with the die cavity after forming, especially the asymmetric part of the branch pipe, the traditional demolding mode is unevenly stressed, which easily causes scratches or deformation of the pipe fitting surface, and reduces the qualified rate of the product; secondly, a complete set of die needs to be replaced for different specifications of tee pipe fittings, which is poor in universality and increases the production cost. SUMMARY

[0003] The application aims at the above problems, and provides a cold extrusion die for asymmetric copper alloy long tee pipe fitting.

[0004] To achieve the above purpose, the application adopts the following technical scheme: A cold extrusion die for asymmetric copper alloy long tee pipe fitting, comprising an upper die assembly, a lower die assembly, a core rod assembly and a demolding assembly, the upper die assembly and the lower die assembly are arranged in a top-to-bottom correspondence, the core rod assembly is located on both sides of the upper die assembly and the lower die assembly, one end of the core rod assembly extends into a forming cavity formed by the upper die assembly and the lower die assembly, the demolding assembly is installed at the bottom of the lower die assembly, a linkage mechanism is arranged between the core rod assembly and the demolding assembly, the core rod assembly demolds the pipe fitting in the forming cavity through the linkage mechanism when moving away from the upper die assembly and the lower die assembly, and a detachable insert assembly is arranged in the lower die assembly, the detachable insert assembly comprises a main pipe forming insert and a branch pipe forming insert.

[0005] In the cold extrusion die for asymmetric copper alloy long tee pipe fitting, the upper die assembly comprises an upper die seat, an upper die backing plate and a punch, the upper die backing plate is fixedly connected to the bottom of the upper die seat through bolts, the punch is fixedly installed on the bottom of the upper die backing plate through a positioning pin, and an upper forming groove matched with the outer contour of the main pipe of the tee pipe fitting is formed in the bottom of the punch.

[0006] In the asymmetric copper alloy long tee pipe cold extrusion die, the lower die assembly includes a lower die seat, a lower die pad and a concave die, the lower die pad is fixedly connected to the top of the lower die seat, the concave die is installed on the top of the lower die pad, the lower forming groove is formed on the top of the concave die and matched with the convex die, the upper forming groove and the lower forming groove form a forming cavity of the main pipe of the tee pipe, a branch forming hole is transversely formed on one side of the concave die and communicated with the forming cavity to form a forming structure of the branch of the tee pipe.

[0007] In the asymmetric copper alloy long tee pipe cold extrusion die, the core rod assembly includes a left core rod and a right core rod, the left core rod and the right core rod are fixedly installed on the hydraulic machine through the core rod fixing seat on both sides, a sliding groove is arranged between the convex die and the concave die and used for installing the left core rod and the right core rod, an extrusion rod is fixedly installed on one end of the left core rod and the right core rod, the outer contour of the extrusion rod is matched with the inner hole of the main pipe of the tee pipe, a water injection hole is arranged in the left core rod and the right core rod and used for injecting high-pressure water into the pipe material, and a push piece is fixedly installed on the left core rod and the right core rod.

[0008] In the asymmetric copper alloy long tee pipe cold extrusion die, the demolding assembly includes a ejector rod, a main injection pipe, a branch injection pipe, an injection cylinder and a piston rod, the piston rod is installed in the inside of the injection cylinder, one side of the injection cylinder is connected with the main injection pipe, the other end of the main injection pipe is connected with a plurality of groups of branch injection pipes, the ejector rod is located in the lower forming groove, and the bottom of the ejector rod is connected with the branch injection pipe.

[0009] In the asymmetric copper alloy long tee pipe cold extrusion die, the linkage mechanism includes a connecting rod, a movable rod, a first transmission gear rack, a second transmission gear rack and a transmission gear, the bottom of the connecting rod is sleeved on the movable rod, an adjusting nut is arranged on the movable rod, the bottom of the connecting rod is fixedly installed on the movable rod through the adjusting nut, the top of the connecting rod is provided with a U-shaped installation groove, the U-shaped installation groove is sleeved on the left core rod and the right core rod respectively, and the connecting rod is in contact with the push piece, the other end of the movable rod extends into the lower die assembly, the first transmission gear rack is fixedly installed on the lower side of the movable rod, the second transmission gear rack is fixedly installed on the top of the piston rod, the transmission gear is located between the first transmission gear rack and the second transmission gear rack, and the transmission gear is in meshing connection with the first transmission gear rack and the second transmission gear rack.

[0010] In the above-mentioned asymmetric copper alloy long tee pipe cold extrusion die, the top of the die is provided with a first fixing groove, the first fixing groove is provided with a second fixing groove, the main pipe forming insert is fixedly installed in the first fixing groove, the two sides of the main pipe forming insert are fixedly provided with connecting parts, the connecting parts are provided with fixing holes, the second fixing groove is a cylindrical structure, and the branch pipe forming insert is embedded in the second fixing groove.

[0011] In the above-mentioned asymmetric copper alloy long tee pipe cold extrusion die, the ejector rod is movably mounted on the main pipe forming insert. The main pipe forming insert is provided with a mating groove for installing the ejector rod. A limit ring is provided on the outside of the ejector rod, and a limit groove that cooperates with the limit ring is provided in the mating groove.

[0012] In the above-mentioned asymmetric copper alloy long tee pipe cold extrusion die, a guide assembly is also provided between the punch and the die. The guide assembly includes guide posts and guide sleeves. The guide posts are fixedly installed at the four corners of the top of the die, and the guide sleeves are fixedly installed at the corresponding positions at the bottom of the punch. The guide posts and guide sleeves are slidably engaged.

[0013] In the aforementioned cold extrusion die for asymmetric copper alloy long tee pipe fittings, the outer walls of the punch and die are provided with fixing grooves.

[0014] Compared with existing technologies, the advantages of this invention are: The linkage mechanism between the mandrel assembly and the demolding assembly of this invention utilizes the lateral movement driving force of the mandrel. When the left and right mandrels complete the extrusion and retraction, the paddles on their surfaces push the connecting rod, causing the movable rod to move. The first transmission rack on the lower side of the movable rod drives the second transmission rack to move upward through the transmission gear, thereby pushing the piston rod to compress the medium in the injection cylinder, increasing the pressure in the main injection tube and the branch injection tube. Finally, the ejector rod pushes the molded tube upward under the pressure. This linkage not only eliminates the need for an additional demolding power source but also ensures the synchronization of the mandrel withdrawal and the tube demolding action, effectively avoiding surface scratches or deformation of the tube caused by friction during mandrel withdrawal.

[0015] This invention achieves integrated molding of asymmetric copper alloy long tee pipe fittings through precise matching of the upper and lower mold components, combined with a composite process of cold extrusion and hydroforming of the mandrel assembly. By using detachable insert components, the main pipe forming insert and the branch pipe forming insert correspond to the forming requirements of the main pipe and branch pipe, respectively. When it is necessary to process asymmetric tee pipe fittings of different specifications, only the appropriate insert needs to be replaced, without the need to redesign or manufacture the entire die, which greatly reduces the cost of mold modification and changeover time.

[0016] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall internal structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall unfolded structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the overall external structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the internal structure of the concave mold of the present invention.

[0021] Figure 5 This is a top view of the concave mold structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the first and second fixing grooves inside the concave mold of the present invention.

[0023] Figure 7 This is the present invention. Figure 4 Enlarged structural diagram at point A in the middle.

[0024] In the diagram: 1. Upper mold assembly; 2. Lower mold assembly; 3. Demolding assembly; 4. Mandrel assembly; 5. Linkage mechanism; 6. Main pipe forming insert; 7. Sub-pipe forming insert; 8. Upper mold base; 9. Upper mold backing plate; 10. Punch; 11. Upper forming groove; 12. Lower mold base; 13. Lower mold backing plate; 14. Die; 15. Lower forming groove; 16. Branch forming hole; 17. Left mandrel; 18. Right mandrel; 19. Extrusion rod; 20. Paddle; 21. Top 21. Rod; 22. Main injection tube; 23. Branch injection tube; 24. Injection cylinder; 25. Piston rod; 26. Connecting rod; 27. Movable rod; 28. First transmission rack; 29. ​​Second transmission rack; 30. Transmission gear; 31. Adjusting nut; 32. First fixing groove; 33. Second fixing groove; 34. Connecting part; 35. Fixing hole; 36. Limiting ring; 37. Mating groove; 38. Limiting groove; 39. Guide post; 40. Guide sleeve; 41. Fixing groove. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figures 1-7As shown, an asymmetric copper alloy long tee pipe cold extrusion die includes an upper die assembly 1, a lower die assembly 2, a mandrel assembly 4, and a demolding assembly 3. The upper die assembly 1 and the lower die assembly 2 are arranged vertically and vertically. The mandrel assembly 4 is located on both sides of the upper die assembly 1 and the lower die assembly 2. One end of the mandrel assembly 4 extends into the forming cavity formed by the upper die assembly 1 and the lower die assembly 2. The demolding assembly 3 is installed at the bottom of the lower die assembly 2. A linkage mechanism 5 is provided between the mandrel assembly 4 and the demolding assembly 3. When the mandrel assembly 4 moves away from the upper die assembly 1 and the lower die assembly 2, the mandrel assembly demolds the pipe in the forming cavity through the linkage mechanism 5. A detachable insert assembly is provided inside the lower die assembly 2. The detachable insert assembly includes a main pipe forming insert 6 and a branch pipe forming insert 7.

[0027] Furthermore, the upper mold assembly 1 includes an upper mold base 8, an upper mold pad 9, and a punch 10. The upper mold base 8 is fixedly connected to the bottom of the upper mold pad 9 by bolts. The punch 10 is fixedly installed on the bottom of the upper mold pad 9 by a positioning pin. The bottom of the punch 10 is provided with an upper forming groove 11 that matches the outer contour of the main pipe of the tee fitting.

[0028] In this embodiment, the upper mold base 8 serves as the supporting foundation of the upper mold assembly 1 and is connected to the upper mold pad 9 by bolts. The upper mold pad 9 can effectively disperse the pressure applied by the hydraulic press and prevent the punch 10 from deforming due to excessive local stress.

[0029] Furthermore, the lower mold assembly 2 includes a lower mold base 12, a lower mold pad 13, and a die 14. The lower mold base 12 is fixedly connected to the top of the lower mold pad 13, and the die 14 is installed on the top of the lower mold pad 13. The top of the die 14 is provided with a lower forming groove 15 that cooperates with the punch 10. The upper forming groove 11 and the lower forming groove 15 surround each other to form the forming cavity of the main pipe of the tee fitting. A branch forming hole 16 is provided laterally on one side of the die 14. The branch forming hole 16 communicates with the forming cavity to form the forming structure of the branch of the tee fitting.

[0030] In this embodiment, the lower die holder 12 provides stable support for the lower die assembly 2, and the lower die pad 13 can buffer the impact force generated during cold extrusion and improve the uniformity of force on the die 14.

[0031] Furthermore, the mandrel assembly 4 includes a left mandrel 17 and a right mandrel 18. The two sides of the left mandrel 17 and the right mandrel 18 are respectively fixedly mounted on the hydraulic press via mandrel fixing seats. A sliding groove for mounting the left mandrel 17 and the right mandrel 18 is provided between the punch 10 and the die 14. An extrusion rod 19 is fixedly mounted at one end of the left mandrel 17 and the right mandrel 18. The outer contour of the extrusion rod 19 is adapted to the inner hole of the main pipe of the tee fitting. A water injection hole for injecting high-pressure water into the pipe is provided inside the left mandrel 17 and the right mandrel 18. A paddle 20 is fixedly mounted on the left mandrel 17 and the right mandrel 18.

[0032] In this embodiment, the left mandrel 17 and the right mandrel 18 are connected to the slider or worktable of the hydraulic press via a mandrel fixing seat, and can move precisely horizontally along the groove between the punch 10 and the die 14. The extrusion rod 19 can provide stable support to the inner wall of the tube during cold extrusion, preventing the inner hole from collapsing or deviating in size during the high-pressure water expansion process; the water injection hole is connected to an external high-pressure water source, injecting high-pressure water at a preset pressure into the tube during molding. Combined with the limiting effect of the extrusion rod 19, the outer wall of the tube is made to fit tightly against the inner walls of the upper forming groove 11, the lower forming groove 15 and the branch forming hole 16, ensuring precise molding of the asymmetrical branch cavity.

[0033] Furthermore, the demolding assembly 3 includes an ejector rod 21, a main injection tube 22, branch injection tubes 23, an injection cylinder 24, and a piston rod 25. The piston rod 25 is installed inside the injection cylinder 24. One end of the injection cylinder 24 is connected to the main injection tube 22, and the other end of the main injection tube 22 is connected to several sets of branch injection tubes 23. The ejector rod 21 is located in the lower molding groove 15, and the bottom of the ejector rod 21 is connected to the branch injection tubes 23.

[0034] In this embodiment, the injection cylinder 24 is pre-filled with hydraulic oil of stable viscosity. When the piston rod 25 slides downward along the inner wall of the injection cylinder 24 under the action of external driving force, the hydraulic oil in the injection cylinder 24 is squeezed into the main injection tube 22, and then distributed to multiple sets of branch injection tubes 23 through the main injection tube 22. The branch injection tubes 23 are connected to the piston chamber at the bottom of the ejector rod 21. The pressure of the hydraulic oil can push the ejector rod 21 to slide upward along the mating groove 37 in the main pipe forming insert 6. The top of the ejector rod 21 contacts the outer wall of the main pipe of the formed tee fitting. The upward pushing force allows the fitting to break free from the restraint of the lower forming groove 15 and the branch pipe forming insert 7, which can ensure that the fitting is subjected to uniform force during demolding and avoid deformation or surface scratches of the fitting due to excessive local force.

[0035] Further, the linkage mechanism 5 includes a connecting rod 26, a movable rod 27, a first transmission rack 28, a second transmission rack 29, and a transmission gear 30. The bottom of the connecting rod 26 is sleeved on the movable rod 27, and an adjusting nut 31 is provided on the movable rod 27. The bottom of the connecting rod 26 is fixedly installed on the movable rod 27 by the adjusting nut 31. The top of the connecting rod 26 is provided with a U-shaped mounting groove, which is respectively sleeved on the left core rod 17 and the right core rod 18, and the connecting rod 26 contacts the paddle 20. The other end of the movable rod 27 extends into the lower mold assembly 2. The first transmission rack 28 is fixedly installed on the lower side of the movable rod 27, and the second transmission rack 29 is fixedly installed on the top of the piston rod 25. The transmission gear 30 is located between the first transmission rack 28 and the second transmission rack 29, and the transmission gear 30 meshes with the first transmission rack 28 and the second transmission rack 29.

[0036] In this embodiment, the connecting rod 26 is linked with the paddles 20 on the left and right mandrels 17 and 18 via the U-shaped mounting groove at the top. When the mandrel assembly 4 moves back to its original position after molding, the paddles 20 push the connecting rod 26 to move synchronously along the axial direction of the movable rod 27. The adjusting nut 31 on the movable rod 27 can adjust the installation position of the connecting rod 26 according to the mandrel's movement stroke to ensure that the contact timing between the paddles 20 and the connecting rod 26 is matched. The portion of the movable rod 27 extending into the lower mold assembly 2 meshes with the transmission gear 30 via the first transmission rack 28. When the movable rod 27 slides horizontally as the mandrel moves back to its original position, the first transmission rack 28 drives the transmission gear 30 to rotate. The transmission gear 30 then meshes with the second transmission rack 29 fixed to the top of the piston rod 25, thereby pushing the piston rod 25 to slide along the inner wall of the injection cylinder 24. This linkage design requires no additional power source; the ejection operation of the demolding assembly 3 can be triggered solely by the mandrel's resetting action, effectively simplifying the mold's operation process and shortening the molding cycle.

[0037] Furthermore, the top of the die 14 is provided with a first fixing groove 32, and the first fixing groove 32 is provided with a second fixing groove 33. The main pipe forming insert 6 is fixedly installed in the first fixing groove 32. Connecting parts 34 are fixedly provided on both sides of the main pipe forming insert 6. The connecting parts 34 are provided with fixing holes 35. The second fixing groove 33 is a cylindrical structure, and the sub-pipe forming insert 7 is embedded in the second fixing groove 33.

[0038] In this embodiment, if the forming surface of the main pipe forming insert 6 is worn or scratched after the mold has been used for a period of time, the insert can be quickly replaced simply by unscrewing the bolts on the connecting part 34, without the need to completely disassemble the die 14, which greatly reduces the maintenance cost and downtime of the mold. Similarly, the branch pipe forming insert 7 can be directly removed from the second fixing groove 33 for replacement, which is especially suitable for mass production scenarios of asymmetrical branch structures and can flexibly adapt to the branch size requirements of different specifications of tee fittings.

[0039] Furthermore, the push rod 21 is movably mounted on the main pipe forming insert 6. The main pipe forming insert 6 is provided with a mating groove 37 for installing the push rod 21. A limiting ring 36 is provided on the outside of the push rod 21. A limiting groove 38 that cooperates with the limiting ring 36 is provided in the mating groove 37.

[0040] In this embodiment, the limiting ring 36 can be embedded in the limiting groove 38 when the push rod 21 pushes the pipe fitting upward, forming an axial limit on the push rod 21, preventing the push rod 21 from detaching from the main pipe forming insert 6 due to excessive pushing, and ensuring that the push rod 21 always remains within the preset range of motion.

[0041] Furthermore, a guide assembly is provided between the punch 10 and the die 14. The guide assembly includes a guide post 39 and a guide sleeve 40. The guide post 39 is fixedly installed at the four corners of the top of the die 14, and the guide sleeve 40 is fixedly installed at the corresponding position at the bottom of the punch 10. The guide post 39 and the guide sleeve 40 are slidably engaged.

[0042] In this embodiment, when the punch 10 closes the mold downward with the hydraulic press slide block, the guide post 39 can be precisely embedded in the guide sleeve 40 and slide smoothly along the inner wall of the guide sleeve 40, effectively avoiding local collisions or misalignments between the punch 10 and the die 14 due to mold closing deviation, ensuring that the upper forming groove 11 and the lower forming groove 15 can be completely aligned, thereby ensuring the forming accuracy of the outer wall of the main pipe of the tee fitting.

[0043] Furthermore, the outer walls on both sides of the punch 10 and the die 14 are provided with fixing grooves 41.

[0044] The working principle of this invention is: When using this invention, the copper alloy tube to be formed is first placed in the lower forming groove 15 of the die 14. Then, the hydraulic press is controlled to drive the upper mold assembly 1 to move downward. The guide sleeve 40 at the bottom of the punch 10 slides along the guide post 39 at the top of the die 14 to achieve precise mold closing, so that the upper forming groove 11 and the lower forming groove 15 surround to form the main tube forming cavity, and the tube is initially positioned in the forming cavity.

[0045] Next, the hydraulic press is started to drive the left mandrel 17 and the right mandrel 18 to move along the slide groove toward the forming cavity. The extrusion rod 19 at one end of the left mandrel 17 and the right mandrel 18 is gradually inserted into the inner hole of the tube until the outer wall of the extrusion rod 19 is tightly attached to the inner wall of the tube. At this time, high-pressure water with a preset pressure is injected into the tube through the water injection hole inside the left mandrel 17 and the right mandrel 18. The high-pressure water forms a uniform expansion force inside the tube. With the support of the extrusion rod 19, the outer wall of the tube gradually attaches to the inner wall of the upper forming groove 11, the lower forming groove 15 and the branch forming hole 16, thus completing the asymmetrical branch cavity forming.

[0046] After molding, the hydraulic press drives the left mandrel 17 and the right mandrel 18 to move back to their original positions on both sides. The paddle 20 on the mandrel pushes the connecting rod 26 to move synchronously. The connecting rod 26 drives the movable rod 27 to slide horizontally. The first transmission rack 28 on the lower side of the movable rod 27 drives the transmission gear 30 to rotate. The transmission gear 30 then pushes the piston rod 25 to slide along the inner wall of the injection cylinder 24 through the second transmission rack 29. The hydraulic oil in the injection cylinder 24 enters the piston chamber at the bottom of the ejector rod 21 through the main injection pipe 22 and the branch injection pipe 23, pushing the ejector rod 21 to slide along the mating groove 37 in the main pipe molding insert 6. The top of the ejector rod 21 contacts the molded tee fitting and pushes it out of the lower molding groove 15, completing the demolding. Finally, the demolded fitting is removed manually or by a robotic arm, and the mold is reset to await the next molding operation.

[0047] The specific embodiments described herein are merely illustrative examples of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention.

[0048] Although this article frequently uses the following terms: 1. Upper mold assembly; 2. Lower mold assembly; 3. Demolding assembly; 4. Mandrel assembly; 5. Linkage mechanism; 6. Main pipe forming insert; 7. Sub-pipe forming insert; 8. Upper mold base; 9. Upper mold backing plate; 10. Punch; 11. Upper forming groove; 12. Lower mold base; 13. Lower mold backing plate; 14. Die; 15. Lower forming groove; 16. Branch forming hole; 17. Left mandrel; 18. Right mandrel; 19. Extrusion rod; 20. Paddle; 21. Ejector rod; 22. Main The terms used include: 23, injection tube; 24, injection cylinder; 25, piston rod; 26, connecting rod; 27, movable rod; 28, first transmission rack; 29, second transmission rack; 30, transmission gear; 31, adjusting nut; 32, first fixing groove; 33, second fixing groove; 34, connecting part; 35, fixing hole; 36, limiting ring; 37, mating groove; 38, limiting groove; 39, guide post; 40, guide sleeve; 41, fixing groove, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A cold extrusion die for an asymmetric copper alloy long tee pipe fitting, characterized in that, The assembly includes an upper mold assembly (1), a lower mold assembly (2), a mandrel assembly (4), and a demolding assembly (3). The upper mold assembly (1) and the lower mold assembly (2) are arranged vertically and vertically. The mandrel assembly (4) is located on both sides of the upper mold assembly (1) and the lower mold assembly (2). One end of the mandrel assembly (4) extends into the molding cavity formed by the upper mold assembly (1) and the lower mold assembly (2). The demolding assembly (3) is installed at the bottom of the lower mold assembly (2). A linkage mechanism (5) is provided between the mandrel assembly (4) and the demolding assembly (3). When the mandrel assembly (4) moves away from the upper mold assembly (1) and the lower mold assembly (2), it demolds the pipe in the molding cavity through the linkage mechanism (5). A detachable insert assembly is provided in the lower mold assembly (2). The detachable insert assembly includes a main pipe forming insert (6) and a branch pipe forming insert (7).

2. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 1, characterized in that, The upper mold assembly (1) includes an upper mold base (8), an upper mold pad (9) and a punch (10). The upper mold base (8) is fixedly connected to the bottom of the upper mold pad (9) by bolts. The punch (10) is fixedly installed on the bottom of the upper mold pad (9) by positioning pins. The bottom of the punch (10) is provided with an upper forming groove (11) that matches the outer contour of the main pipe of the tee fitting.

3. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 2, characterized in that, The lower mold assembly (2) includes a lower mold base (12), a lower mold pad (13), and a die (14). The lower mold base (12) is fixedly connected to the top of the lower mold pad (13). The die (14) is installed on the top of the lower mold pad (13). The die (14) has a lower forming groove (15) that cooperates with the punch (10) on the top. The upper forming groove (11) and the lower forming groove (15) enclose each other to form the forming cavity of the main pipe of the tee fitting. A branch forming hole (16) is opened laterally on one side of the die (14). The branch forming hole (16) communicates with the forming cavity to form the forming structure of the branch of the tee fitting.

4. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 3, characterized in that, The mandrel assembly (4) includes a left mandrel (17) and a right mandrel (18). The two sides of the left mandrel (17) and the right mandrel (18) are respectively fixedly mounted on the hydraulic press by mandrel fixing seats. A sliding groove for mounting the left mandrel (17) and the right mandrel (18) is provided between the punch (10) and the die (14). An extrusion rod (19) is fixedly installed at one end of the left mandrel (17) and the right mandrel (18). The outer contour of the extrusion rod (19) is adapted to the inner hole of the main pipe of the tee fitting. A water injection hole for injecting high-pressure water into the pipe is provided inside the left mandrel (17) and the right mandrel (18). A paddle (20) is fixedly installed on the left mandrel (17) and the right mandrel (18).

5. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 4, characterized in that, The demolding assembly (3) includes an ejector rod (21), a main injection tube (22), a branch injection tube (23), an injection cylinder (24), and a piston rod (25). The piston rod (25) is installed inside the injection cylinder (24). One end of the injection cylinder (24) is connected to the main injection tube (22), and the other end of the main injection tube (22) is connected to several sets of branch injection tubes (23). The ejector rod (21) is located in the lower molding groove (15), and the bottom of the ejector rod (21) is connected to the branch injection tubes (23).

6. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 5, characterized in that, The linkage mechanism (5) includes a connecting rod (26), a movable rod (27), a first transmission rack (28), a second transmission rack (29), and a transmission gear (30). The bottom of the connecting rod (26) is sleeved on the movable rod (27), and an adjusting nut (31) is provided on the movable rod (27). The bottom of the connecting rod (26) is fixedly installed on the movable rod (27) by the adjusting nut (31). The top of the connecting rod (26) is provided with a U-shaped mounting groove, which is respectively sleeved on the left core rod (17) and... On the right mandrel (18), and the connecting rod (26) contacts the paddle (20), the other end of the movable rod (27) extends into the lower mold assembly (2), the first transmission rack (28) is fixedly installed on the lower side of the movable rod (27), the second transmission rack (29) is fixedly installed on the top of the piston rod (25), the transmission gear (30) is located between the first transmission rack (28) and the second transmission rack (29), and the transmission gear (30) meshes with the first transmission rack (28) and the second transmission rack (29).

7. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 6, characterized in that, The top of the die (14) is provided with a first fixing groove (32), and a second fixing groove (33) is provided on the first fixing groove (32). The main pipe forming insert (6) is fixedly installed in the first fixing groove (32). Connecting parts (34) are fixedly provided on both sides of the main pipe forming insert (6). Fixing holes (35) are provided on the connecting parts (34). The second fixing groove (33) is a cylindrical structure. The sub-pipe forming insert (7) is embedded in the second fixing groove (33).

8. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 7, characterized in that, The top rod (21) is movably installed on the main pipe forming insert (6). The main pipe forming insert (6) is provided with a mating groove (37) for installing the top rod (21). A limiting ring (36) is provided on the outside of the top rod (21). A limiting groove (38) that cooperates with the limiting ring (36) is provided in the mating groove (37).

9. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 8, characterized in that, A guide assembly is also provided between the punch (10) and the die (14). The guide assembly includes a guide post (39) and a guide sleeve (40). The guide post (39) is fixedly installed at the four corners of the top of the die (14), and the guide sleeve (40) is fixedly installed at the corresponding position at the bottom of the punch (10). The guide post (39) and the guide sleeve (40) are slidably engaged.

10. The cold extrusion die for the asymmetric copper alloy long tee pipe fitting according to claim 9, characterized in that, The outer walls of the punch (10) and die (14) are provided with fixing grooves (41).

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