Copper tube layout forming process

Abstract

The application discloses a copper pipe layout forming process and belongs to the technical field of metal punch forming. The process conveys a strip-shaped copper sheet along a conveying direction and sequentially carries out pretreatment, sheet forming, petal forming, round wrapping forming and round forming through a die. The pretreatment forms a positioning structure on one side of the copper sheet through edge cutting, forms a convex bump through stamping, and cuts out a horizontal groove and two vertical grooves to form a sheet-shaped copper pipe and a bending concave part; the sheet forming sequentially stamps a V-shaped groove, a Z-shaped groove, a convex part and a clamping point; the petal forming array stamping forms a plurality of petal sheets and shapes, reserves a connecting point and cuts out an inclined surface; the round wrapping forming divides the sheet-shaped copper pipe into A, B, C and D sections along a plugging direction and forms a copper pipe with an opening through segmented and progressive multiple stamping; the round forming sequentially stamps the sections to make the openings merge, and finally cuts off the excess copper sheet to obtain a complete copper pipe. The application can realize continuous layout forming of the copper pipe, and improves the production efficiency and forming consistency.

Description

Technical Field

[0001] This invention relates to the field of connector manufacturing technology, and in particular to a copper tube layout forming process. Background Technology

[0002] Copper tubing, used for electrical conduction, gas conduction, and structural applications, is widely used in connectors, sensors, medical devices, home appliances, automotive electronics, and precision instruments. Some copper tubing products not only require a perfectly round shape and good surface quality, but also functional structures such as petal-shaped elastic contact structures, locking points, and protrusions at the ends of the tubing to meet the needs of insertion, locking, and elastic contact.

[0003] Current copper tube manufacturing typically involves cutting round tubes before end processing. For example, the finished round tube is first blanked, and then the end petals and locking structures are processed by turning, stamping, or spinning. This method has the following drawbacks: First, the round tubes are clamped and processed one by one, resulting in low production efficiency and making it difficult to adapt to large-scale continuous production. Second, the functional structures such as end petals and locking points are processed after the tube body has been rounded, which poses risks of inconsistent positioning benchmarks, relative structural position deviations, and deformation. Third, the round tube blanking and end processing steps are scattered, resulting in poor material utilization and process consistency.

[0004] Some copper tubes are manufactured using a process of flat plate stamping followed by rolling. However, without a systematic layout and segmented progressive forming, problems such as bending position deviation, unstable petal shape, uneven roundness, poor roundness, and incomplete opening closure can easily occur. For copper tubes that need to simultaneously form bending structures, protrusions, locking points, and petal shapes, how to sequentially complete the forming of each functional structure in continuous layout and finally roll and close them is a technical problem that existing processes need to solve. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a copper tube layout forming process that enables continuous layout forming of copper tubes, thereby improving production efficiency and forming consistency.

[0006] The technical solution adopted in this invention is: a copper tube layout forming process, in which strip copper sheets are conveyed along the conveying direction and pre-treated, sheet-shaped, petal-shaped, rounded, and fully rounded in sequence through a mold;

[0007] The pretreatment includes: cutting one side of the copper sheet to form a positioning structure, and simultaneously punching a bulge on the side of the copper sheet away from the positioning structure while cutting the edge; then cutting a horizontal groove and two vertical grooves perpendicular to the horizontal groove in sequence on the copper sheet to form a sheet-like copper tube on the copper sheet, and forming a bending recess on the opposite side of the vertical groove. The sheet forming process includes: stamping V-grooves sequentially on the cross-section of the sheet copper tube near the bending recess, stamping the V-grooves a second time to form Z-grooves, and then shaping them into vertical Z-grooves so that the front and rear ends of the sheet copper tube are parallel to each other; stamping a protrusion on the rear of the sheet copper tube, with one side of the protrusion connected to the vertical Z-groove and the other side forming an inclined section; and stamping a locking point on the front of the sheet copper tube near the vertical Z-groove, with the locking point protruding towards the surface of the sheet copper tube. The petal forming process includes: stamping multiple U-shaped grooves in the front part of the sheet copper tube to form multiple petal pieces; stamping an outwardly expanding arc at the end of the petal piece and shaping the petal piece by tilting it upwards; cutting and reserving a connection point between the sheet copper tube and the copper sheet, and cutting a bevel at the end of the sheet copper tube. The rounding process includes: forming segments A, B, C, and D sequentially along the insertion direction of the sheet copper tube; passing each segment through different rounding dies for multiple rounding stampings; each stamping causes each segment to form a certain arc until a copper tube with an opening is formed. The rounding process includes: repeatedly rounding each segment of the open copper tube through different rounding molds, and then repeatedly rounding and shaping, with each stamping causing each segment to form a certain arc until the opening is merged. Finally, the excess copper sheet is cut off to obtain a complete copper tube.

[0008] A further improvement to the above solution is that the positioning structure includes a positioning hole and a positioning slot, and the positioning structure is used to position the copper sheet in subsequent processes.

[0009] A further improvement to the above scheme is that the V-groove is formed by stamping the cross-section of the sheet copper tube near the bending recess using a V-folding die, so that the front part of the sheet copper tube is folded upward; the Z-groove is formed by stamping the V-groove twice using a secondary folding die, and then shaped by a primary forming die and a secondary forming die to form a vertical Z-groove.

[0010] A further improvement to the above scheme is that, in the petal forming process, a petal stamping die forms multiple U-shaped grooves in the front of the sheet copper tube; a petal primary forming die forms an outwardly expanding arc at the end of the petal; a petal secondary forming die stamps the end of the petal away from the outwardly expanding arc, causing the petal to tilt upward; and a petal shaping die performs secondary stamping to shape the curvature and shape of the petal.

[0011] A further improvement to the above scheme is that the rounding mold includes an upper rounding mold and a lower rounding mold. The lower rounding mold has a rounding cavity, and the upper rounding mold has a rounding punch. The rounding punch cooperates with the rounding cavity to gradually round the sheet copper tube.

[0012] A further improvement to the above scheme is that the circular mold includes a circular upper mold and a circular lower mold. The circular lower mold has a circular punch, and the circular upper mold has a circular cavity. The circular punch and the circular cavity cooperate to merge the opening of the copper tube.

[0013] A further improvement to the above scheme is that segments A, B, C, and D are distributed sequentially along the insertion direction of the sheet-like copper tube, wherein segment A corresponds to the front part where the petal is located, and segment D corresponds to the rear part where the protrusion is located.

[0014] A further improvement to the above solution is that the chamfering die leaves a connection point when cutting between the sheet copper tube and the copper sheet. The connection point is used to connect the sheet copper tube to the copper sheet for continuous transmission during the subsequent rounding and full-rounding processes.

[0015] A further improvement to the above scheme is that the convex stamping is formed on the side of the copper sheet away from the positioning structure, which is used to assist in guidance or positioning during the copper sheet transmission process.

[0016] A further improvement to the above scheme is that two vertical grooves are provided, both of which are perpendicularly connected to the horizontal groove, and the two vertical grooves are located on the same side of the horizontal groove, so as to define the outline of the sheet copper tube on the copper sheet.

[0017] A further improvement to the above scheme is that the petal pieces are formed by multiple U-shaped grooves arranged in an array, and the multiple petal pieces are arranged in a circumferential array at the front of the sheet-like copper tube.

[0018] A further improvement to the above scheme is that, in the rounding process, segments A, B, C, and D are stamped in a segmented, progressive, and multiple-stage manner, and different rounding dies are used for stamping different segments; in the whole-circle process, segments A, B, C, and D are stamped in a segmented, progressive, and multiple-stage manner, and different whole-circle dies are used for stamping different segments.

[0019] The beneficial effects of this invention are: Compared with existing technologies, this invention uses strip copper sheets as raw materials and completes processes such as edge trimming, grooving, bending, petal forming, rounding, and full rounding sequentially through continuous layout. The copper tube is formed station by station as it is continuously transported along with the copper sheet, eliminating the need for individual clamping and enabling continuous and automated copper tube manufacturing, significantly improving production efficiency. Positioning holes and slots are formed on one side of the copper sheet by cutting edges, allowing subsequent processes such as grooving, bending, petal stamping, rounding, and full rounding to be positioned using the positioning structure, ensuring consistent relative positions between processes and improving forming accuracy. V-grooves and Z-grooves are sequentially stamped on the cross-section of the sheet copper tube near the bending recess, and a vertical Z-groove is formed, making the front and rear ends of the sheet copper tube parallel to each other. Simultaneously, a protrusion is stamped at the rear and a locking point is stamped at the front, providing a stable structural foundation for subsequent rounding and full rounding.

[0020] Multiple U-shaped grooves are formed by array stamping at the front of the sheet copper tube, which in turn forms multiple petal pieces. Through multiple forming and shaping processes, the petal pieces are made to form an outwardly expanding arc, tilt upwards, and maintain a stable arc, ensuring the stability of the petal piece's shape and elasticity.

[0021] The sheet copper tube is divided into sections A, B, C, and D along the insertion direction. Different rounding dies and full-rounding dies are used to perform multiple progressive stamping processes on different sections, so that each section gradually forms an arc and eventually closes together. This avoids cracking, wrinkling, or springback caused by large deformation at one time, and improves the roundness and surface quality of the copper tube.

[0022] This invention utilizes a continuous nesting molding process, in which the petal-shaped parts, protrusions, locking points, and oblique parts of the copper tube are formed sequentially in a single continuous nesting process. The relative positions of each structure are consistent, resulting in good consistency and interchangeability of the finished copper tube. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the changes in the copper tube layout and forming process of the present invention; Figure 2 This is a schematic diagram illustrating the changes in the copper tube layout and forming process of the present invention; Figure 3 This is a schematic diagram of the structure of the copper tube after forming according to the present invention; Figure 4 This is a schematic diagram of the sheet forming process of the present invention; Figure 5 This is a schematic diagram of the petal forming process of the present invention; Figure 6 This is a schematic diagram of the rounding process of the present invention; Figure 7 This is a schematic diagram of the circular forming process of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1. Copper sheet; 2. Positioning structure, 201. Positioning hole, 202. Positioning slot; 3. Convex bulge; 4. Horizontal groove; 5. Vertical groove; 6. Sheet copper tube; 7. Bending recess; 8. V groove; 9. Z groove; 10. Convex part; 11. Inclined part; 12. Locking point; 13. U-shaped groove; 14. Petal piece; 15. Outwardly expanding arc part; 16. Inclined surface; 17. Connection point; 18. Section A; 19. Section B; 20. Section C; 21. Section D; 22. Copper tube; 23. Opening; 24. Rounding mold; 25. Rounding upper mold; 26. Rounding lower mold; 27. Rounding cavity; 28. Rounding punch; 29. ​​Complete circle mold; 30. Complete circle upper mold; 31. Complete circle lower mold; 32. Complete circle punch; 33. Complete circle cavity. Detailed Implementation

[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] like Figures 1-7 As shown, this invention provides a copper tube layout forming process. Using strip copper sheets 1 as raw material, the copper sheets 1 are continuously conveyed along the transport direction and undergo pretreatment, sheet forming, petal forming, rounding, and full-rounding processes sequentially through multiple molds set along the transport path, ultimately yielding a complete copper tube 22. In a continuous layout, connection points 17 are maintained between the sheet copper tubes 6 and the copper sheet 1, allowing the sheet copper tubes 6 to be continuously conveyed with the copper sheet 1. At each station, processes such as edge trimming, grooving, bending, petal stamping, rounding, and full-rounding are sequentially completed. Finally, excess copper sheets 1 are removed to obtain the separated complete copper tube 22. Positioning between processes is achieved using positioning structures 2 on the copper sheets 1, ensuring that the relative positions of the same sheet copper tube 6 are consistent as it passes through each mold, thereby improving the forming accuracy of each structure of the copper tube 22.

[0029] The pre-processing step first trims one side of the copper sheet 1. After trimming, a positioning structure 2 is formed on that side of the copper sheet 1. The positioning structure 2 includes positioning holes 201 and positioning slots 202. The positioning holes 201 and positioning slots 202 are spaced apart along the transport direction of the copper sheet 1 and are used to position the copper sheet 1 in subsequent processes. By using the positioning structure 2 as a unified positioning reference, each mold can accurately position and stamp the copper sheet 1.

[0030] While the positioning structure 2 is formed by cutting the edge, a bulge 3 is stamped on the side of the copper sheet 1 away from the positioning structure 2. The bulge 3 protrudes towards the surface of the copper sheet 1 and is used to cooperate with the guide structure or as an auxiliary positioning reference during the transmission of the copper sheet 1.

[0031] Subsequently, the copper sheet 1 enters the cutting die. The cutting die cuts horizontal grooves 4 and vertical grooves 5 on the copper sheet 1. There are two vertical grooves 5, both of which are perpendicular to the horizontal grooves 4 and are located on the same side of the horizontal grooves 4. The outline of the sheet-like copper tube 6 is defined on the copper sheet 1 by the horizontal grooves 4 and the two vertical grooves 5. On the opposite side of the vertical grooves 5, that is, in the opposite direction of the horizontal grooves 4, a bending recess 7 is formed.

[0032] See Figure 4 As shown, the sheet copper tube 6 is still connected to the copper sheet 1 through its rear end so that it can continue to be transported forward with the copper sheet 1.

[0033] The sheet forming process is used to form bending structures, protrusions 10 and locking points 12 on the sheet copper tube 6, providing a structural basis for subsequent petal forming, rounding and full rounding.

[0034] First, the V-folding die punches a V-groove 8 on the cross-section of the sheet copper tube 6 near the bending recess 7. The formation of the V-groove 8 causes the front part of the sheet copper tube 6 to fold upward, that is, the front end of the sheet copper tube 6 forms a certain folding angle relative to the rear end.

[0035] Subsequently, the secondary bending die performs a secondary stamping at the V-groove 8. The secondary stamping further deforms the V-groove 8, forming the Z-groove 9. The Z-groove 9 has a more pronounced bending step compared to the V-groove 8, further altering the relative positions of the front and rear ends of the sheet copper tube 6.

[0036] The forming die performs stamping and forming at the Z-groove 9. After the first forming, the Z-groove 9 becomes a vertical Z-groove 9. The vertical Z-groove 9 makes the front and rear ends of the sheet copper tube 6 parallel to each other, that is, the front and rear parts of the sheet copper tube 6 form a parallel misaligned structure under the connection of the vertical Z-groove 9.

[0037] The secondary forming die stamps a protrusion 10 at the rear of the sheet copper tube 6. One side of the protrusion 10 is connected to the vertical Z-groove 9, and the other side forms an inclined section 11. The inclined section 11 makes the protrusion 10 form a transition from high to low, which facilitates the smooth curling of the rear of the sheet copper tube 6 during subsequent rounding forming.

[0038] The squeegee punches out a locking point 12 on the front part of the sheet copper tube 6 near the vertical Z-groove 9. The locking point 12 protrudes towards the surface of the sheet copper tube 6. The locking point 12 is used to form an inward or outward locking protrusion on the tube body after the copper tube 22 is formed, so as to cooperate with the connector or other components to achieve positioning or locking.

[0039] See Figure 5 As shown, the petal forming process is used to form multiple petal pieces 14 at the front of the sheet copper tube 6, and to perform multiple forming and shaping of the petal pieces 14.

[0040] First, a petal stamping die is used to stamp multiple U-shaped grooves 13 in an array at the front of the sheet copper tube 6. The multiple U-shaped grooves 13 are arranged in an array along the circumferential direction of the front of the sheet copper tube 6, and petal pieces 14 are formed between two adjacent U-shaped grooves 13. Thus, multiple spaced petal pieces 14 are formed at the front of the sheet copper tube 6.

[0041] Subsequently, a petal-forming die stamps outwardly expanding arc portion 15 at the end of the petal piece 14. The outwardly expanding arc portion 15 causes the end of the petal piece 14 to expand outward, forming an arc-shaped outward expansion structure, which improves the elasticity and contact performance of the petal piece 14.

[0042] Next, the petal secondary forming mold stamps at the end of the petal piece 14 away from the outwardly expanding arc portion 15, causing the petal piece 14 to tilt upwards. The upwardly tilted petal piece 14 forms a certain angle with the front surface of the sheet-like copper tube 6, preparing for the subsequent rounding forming to create an elastic petal structure that either converges inwards or opens outwards.

[0043] Finally, the petal shaping mold performs a second stamping on the petal pieces 14 to shape the curvature and shape of the petal pieces 14, so that the curvature, tilt angle and shape of each petal piece 14 are consistent.

[0044] After the petal forming is completed, the chamfering die cuts between the sheet copper tube 6 and the copper sheet 1, while leaving a connection point 17 so that the sheet copper tube 6 is still connected to the copper sheet 1 through the connection point 17. The chamfering die also cuts a bevel 16 at the end of the sheet copper tube 6. The bevel 16 forms a chamfer on the front end face of the sheet copper tube 6, which facilitates the smooth curling and closing of the front end face during subsequent rounding forming.

[0045] See Figure 6 As shown, the rounding process gradually rolls the sheet copper tube 6 into a copper tube 22 with an opening 23.

[0046] Along the insertion direction of the sheet copper tube 6, the sheet copper tube 6 is divided into segments A 18, B 19, C 20, and D 21. Among them, segment A 18 corresponds to the front part where the petal 14 is located, segment D 21 corresponds to the rear part where the protrusion 10 is located, and segments B 19 and C 20 are located between segments A 18 and D 21.

[0047] During the rounding process, each segment is sequentially passed through different rounding dies 24 for multiple rounding stampings. In each stamping, the rounding die 24 forms a certain arc on segment A 18, segment B 19, segment C 20, and segment D 21. After multiple progressive rounding stampings, each segment of the sheet copper tube 6 gradually curls up, eventually forming a copper tube 22 with an opening 23.

[0048] The rounding die 24 includes an upper rounding die 25 and a lower rounding die 26. The lower rounding die 26 has a rounding cavity 27, and the upper rounding die 25 has a rounding punch 28. During stamping, the upper rounding die 25 presses down, and the rounding punch 28 cooperates with the rounding cavity 27 to stamp the sheet copper tube 6, causing the sheet copper tube 6 to gradually curl and form a rounding effect.

[0049] Because segments A (18), B (19), C (20), and D (21) have different bending states and structural characteristics before rounding, different rounding dies (24) are used for stamping to meet the forming requirements of each segment. By using segmented, progressive, and multiple stamping processes, problems such as cracking, wrinkling, and springback caused by large deformation in a single operation are avoided.

[0050] After rounding, the copper tube 22 still has an opening 23. The rounding process is used to merge the opening 23 and improve the roundness of the copper tube 22.

[0051] See Figure 7 As shown, during the rounding process, different rounding dies 29 are set sequentially for sections A 18, B 19, C 20, and D 21 of the copper tube 22 with openings 23 to perform multiple rounding processes. In each stamping, the rounding die 29 forms a certain arc for each section, gradually reducing the opening 23.

[0052] After the rounding is completed, multiple rounding and shaping processes are performed to make the curvature of each segment of the copper tube 22 more consistent, and finally the opening 23 is completely merged.

[0053] The circular die 29 includes a circular upper die 30 and a circular lower die 31. The circular lower die 31 has a circular punch 32, and the circular upper die 30 has a circular cavity 33. During stamping, the circular punch 32 of the circular lower die 31 cooperates with the circular cavity 33 of the circular upper die 30 to gradually close the opening 23 of the copper tube 22.

[0054] The round forming process also adopts segmented progressive multiple stamping, with different round forming dies 29 used for different segments to ensure the roundness of each segment of the copper tube 22 and the consistency of the closing of the opening 23.

[0055] After the rounding process is completed, the sheet copper tube 6 has been formed into a complete copper tube 22, but the copper tube 22 is still connected to the copper sheet 1 through the connection point 17. Finally, the excess copper sheet 1 is cut off by the cutting process, so that the copper tube 22 is separated from the copper sheet 1, and the complete copper tube 22 is obtained.

[0056] Through the above continuous nesting and forming process, the copper sheet 1 completes pretreatment, sheet forming, petal forming, rounding forming and full round forming in sequence on a production line. The petal 14, protrusion 10, locking point 12, inclined part 11, inclined surface 16 and other structures of the copper tube 22 are formed in sequence in the continuous nesting process. The relative positions of each structure are consistent, and finally a copper tube 22 with complete structure, good consistency and suitable for mass production is obtained.

[0057] In this process, the positioning between each step is based on the positioning structure 2. The positioning structure 2 includes a positioning hole 201 and a positioning slot 202. Each mold is equipped with a positioning pin or positioning block that mates with the positioning hole 201 and the positioning slot 202. As the copper sheet 1 advances one station, the positioning structure 2 mates with the positioning component of the corresponding mold to ensure the accurate relative position of the same sheet copper tube 6 as it passes through each mold in sequence.

[0058] The convex hull 3 is formed by stamping on the side of the copper sheet 1 away from the positioning structure 2. The convex hull 3 serves two purposes: firstly, it cooperates with the guide structure during transmission, and secondly, it acts as an auxiliary positioning reference, further improving the stability of the copper sheet 1 during transmission and stamping.

[0059] The petal-shaped pieces 14 are formed at intervals by multiple U-shaped grooves 13 arranged in an array. The multiple petal-shaped pieces 14 are arranged in a circumferential array at the front of the sheet-like copper tube 6. After being rounded and formed, the petal-shaped pieces 14 are distributed circumferentially at the front end of the copper tube 22 as the front part curls up, forming an elastic petal-shaped contact structure.

[0060] The locking point 12 is formed by stamping on the front part of the sheet copper tube 6 near the vertical Z-groove 9, and protrudes towards the surface of the sheet copper tube 6. After the rounding is completed, the locking point 12 is located on the tube body of the copper tube 22, forming an outward locking protrusion or an inward locking structure.

[0061] One side of the protrusion 10 is connected to the vertical Z-groove 9, and the other side forms an inclined portion 11. The inclined portion 11 provides a transition for the rear curling of the sheet copper tube 6 during the rounding process, preventing cracking during the rear curling.

[0062] This invention achieves continuous and efficient forming of copper tubes 22 by continuously arranging strip copper sheets 1, sequentially completing pretreatment, sheet forming, petal forming, rounding forming, and full-circle forming. The process uses a positioning structure 2 to ensure positioning accuracy at each stage and segmented progressive stamping to guarantee the quality of rounding and full-circle forming. It can continuously form complete copper tubes 22 with functional structures such as petal pieces 14, protrusions 10, and locking points 12 in one operation, offering advantages such as high production efficiency, good forming consistency, and stable product quality.

[0063] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A copper tube layout forming process, characterized in that, The strip copper sheet (1) is conveyed along the conveying direction and is pre-treated, sheet-shaped, petal-shaped, rounded and rounded in sequence through the mold; The pretreatment includes: cutting one side of the copper sheet (1) to form a positioning structure (2), and simultaneously punching a bulge (3) on the side of the copper sheet (1) away from the positioning structure (2); then cutting a horizontal groove (4) and two vertical grooves (5) perpendicularly connected to the horizontal groove (4) in sequence on the copper sheet (1) to form a sheet-like copper tube (6) on the copper sheet (1), and forming a bending recess (7) on the opposite side of the vertical groove (5); The sheet forming process includes: stamping a V-groove (8) sequentially on the cross-section of the sheet copper tube (6) near the bending recess (7), stamping the V-groove (8) a second time to form a Z-groove (9), and then shaping it to form a vertical Z-groove (9), so that the front end and the rear end of the sheet copper tube (6) are parallel to each other; stamping a protrusion (10) on the rear part of the sheet copper tube (6), with one side of the protrusion (10) connected to the vertical Z-groove (9) and the other side forming an oblique part (11); stamping a locking point (12) on the front part of the sheet copper tube (6) near the vertical Z-groove (9), with the locking point (12) protruding towards the surface of the sheet copper tube (6); The petal forming process includes: stamping multiple U-shaped grooves (13) in an array at the front of the sheet copper tube (6) to form multiple petal pieces (14); stamping an outwardly expanding arc portion (15) at the end of the petal piece (14) and shaping the petal piece (14) by tilting it upwards; cutting and reserving a connection point (17) between the sheet copper tube (6) and the copper sheet (1), and cutting a bevel (16) at the end of the sheet copper tube (6); The rounding process includes: forming sections A (18), B (19), C (20), and D (21) sequentially along the insertion direction of the sheet copper tube (6), and performing multiple rounding stampings on each section through different rounding molds (24). Each stamping causes each section to form a certain arc until a copper tube (22) with an opening (23) is formed. The rounding process includes: repeatedly rounding each segment of the copper tube (22) with the opening (23) through different rounding molds (29), and then repeatedly rounding and shaping, with each stamping causing each segment to form a certain arc until the opening (23) is merged. Finally, the excess copper sheet (1) is cut off to obtain a complete copper tube (22).

2. The copper tube layout and forming process according to claim 1, characterized in that, The positioning structure (2) includes a positioning hole (201) and a positioning slot (202), and the positioning structure (2) is used to position the copper sheet (1) in subsequent processes.

3. The copper tube layout and forming process according to claim 1, characterized in that, The V-groove (8) is formed by stamping the cross section of the sheet copper tube (6) near the bending recess (7) with a V-folding die, so that the front part of the sheet copper tube (6) is folded upward; the Z-groove (9) is formed by stamping the V-groove (8) twice with a secondary folding die, and then shaped by a primary shaping die and a secondary shaping die to form a vertical Z-groove (9).

4. The copper tube layout and forming process according to claim 1, characterized in that, In the petal forming process, multiple U-shaped grooves (13) are formed by stamping the front part of the sheet copper tube (6) using a petal stamping die; an outwardly expanded arc portion (15) is formed by stamping the end of the petal piece (14) using a petal one-time forming die; a petal two-time forming die is used to stamp the end of the petal piece (14) away from the outwardly expanded arc portion (15), causing the petal piece (14) to tilt upwards; and a petal shaping die is used to perform a second stamping to shape the curvature and shape of the petal piece (14).

5. The copper tube layout and forming process according to claim 1, characterized in that, The rounding mold (24) includes a rounding upper mold (25) and a rounding lower mold (26). The rounding lower mold (26) has a rounding cavity (27), and the rounding upper mold (25) has a rounding punch (28). The rounding punch (28) cooperates with the rounding cavity (27) to gradually round the sheet copper tube (6). The circular mold (29) includes a circular upper mold (30) and a circular lower mold (31). The circular lower mold (31) has a circular punch (32), and the circular upper mold (30) has a circular cavity (33). The circular punch (32) and the circular cavity (33) cooperate to merge the opening (23) of the copper tube (22).

6. The copper tube layout and forming process according to claim 1, characterized in that, The segments A (18), B (19), C (20), and D (21) are distributed sequentially along the insertion direction of the sheet copper tube (6), wherein segment A (18) corresponds to the front part where the petal (14) is located, and segment D (21) corresponds to the rear part where the protrusion (10) is located.

7. The copper tube layout and forming process according to claim 1, characterized in that, When the chamfering die cuts between the sheet copper tube (6) and the copper sheet (1), a connection point (17) is reserved. The connection point (17) is used to connect the sheet copper tube (6) to the copper sheet (1) for continuous transmission during the subsequent rounding and full-rounding processes.

8. The copper tube layout and forming process according to claim 1, characterized in that, The convex hull (3) is stamped on the side of the copper sheet (1) away from the positioning structure (2) and is used to guide or assist in positioning during the transmission of the copper sheet (1).

9. The copper tube layout and forming process according to claim 1, characterized in that, There are two vertical grooves (5), both of which are perpendicularly connected to the horizontal groove (4), and the two vertical grooves (5) are located on the same side of the horizontal groove (4) to define the outline of the sheet copper tube (6) on the copper sheet (1). The petal pieces (14) are formed by multiple U-shaped grooves (13) arranged in an array, and the multiple petal pieces (14) are arranged in a circumferential array at the front of the sheet-like copper tube (6).

10. The copper tube layout and forming process according to claim 1, characterized in that, In the rounding process, segments A (18), B (19), C (20), and D (21) are stamped in a segmented, progressive, and multiple manner, and different rounding dies (24) are used for stamping different segments; in the whole-rounding process, segments A (18), B (19), C (20), and D (21) are stamped in a segmented, progressive, and multiple manner, and different whole-rounding dies (29) are used for stamping different segments.

Images