Metal pipe punching and flanging assembly and equipment

Abstract

The utility model provides a metal pipe punching and flanging assembly and device.The metal pipe punching and flanging assembly comprises a guide pipe die and a punch, a through hole is formed in the pipe wall of the guide pipe die, and the through hole penetrates through the pipe walls of the two opposite sides of the guide pipe die; the punch is arranged in the through hole and does protruding and retracting movement in the direction perpendicular to the center line of the guide pipe die in the through hole, the punch comprises a main body part and a punching part arranged at one end of the main body part, the main body part comprises a flanging section and a connecting section, the flanging section is close to the punching part relative to the connecting section, and the connecting section is close to the punching part relative to the connecting section. In addition, according to the projection on the plane perpendicular to the axis of the punch, the projection area of the connecting section is smaller than that of the flanging section, so that the service life of the punch can be relatively prolonged, and the flanging hole machining cost is further reduced.

Description

Technical Field

[0001] This application belongs to the field of metal pipe processing, and specifically relates to a metal pipe punching and flanging assembly and equipment. Background Technology

[0002] In air conditioning piping systems, some metal pipe components are typically configured with main pipes and branch pipes. The side wall of the main pipe has flanged holes to increase the welding area between the branch pipe and the main pipe, thereby improving the connection strength. However, in current technology, the punching tool experiences significant resistance during the processing of flanged holes, resulting in a short tool life and increasing the cost of processing flanged holes. Utility Model Content

[0003] Therefore, it is necessary to provide a metal tube punching and flanging assembly that can extend tool life and reduce the processing cost of flanging holes, addressing the aforementioned problems. The specific technical solution is as follows:

[0004] A metal tube punching and flanging assembly includes a guide die, a punch, and a push rod. The guide die has a through hole in its wall, which penetrates the walls of opposite sides of the guide die. The punch is disposed in the through hole, and the push rod is slidably engaged with the punch. The push rod can push the punch to extend and retract within the through hole in a direction perpendicular to the centerline of the guide die. The punch includes a main body and a punching portion disposed at one end of the main body. The main body includes a flanging section and a connecting section. The flanging section is closer to the punching portion than the connecting section. The projection area of ​​the connecting section on a plane perpendicular to the axis of the punch is smaller than the projection area of ​​the flanging section.

[0005] This application provides a metal tube punching and flanging assembly. During the flanging process, the punch first punches the wall of the tube to be processed into a flanging hole using the punching part, and then the main body performs flanging processing on the hole. The main body includes a cylindrical flanging section and a cut-out part as a connecting section for part of the outer wall. During the flanging process, the flanging section plays the main flanging role. Then, as the punch continues to move (extend or retract), the main body of the punch will be subject to frictional resistance from the inner wall of the flanging hole and the inner wall of the through hole. By setting the projected area of ​​the connecting section to be smaller than the projected area of ​​the flanging section, the resistance of the punch to the inner wall of the flanging hole and the through hole wall during movement can be reduced, which can relatively improve the life of the punch and further reduce the cost of flanging processing.

[0006] This application also provides a metal tube punching and flanging device, including a metal tube punching and flanging assembly, a drive assembly, and a clamping assembly. The clamping assembly is used to clamp the tube to be processed. The metal tube punching and flanging assembly includes a guide die, a punch, and a push rod. The guide die has a through hole in its tube wall, which penetrates the tube walls on opposite sides of the guide die. The punch is disposed in the through hole and moves in a direction perpendicular to the centerline of the guide die. The punch includes a main body and a punching portion disposed at one end of the main body. The main body includes a flanging section and a connecting section. The flanging section is cylindrical and is closer to the punching portion than the connecting section. The punch includes a notch, which is part of the outer wall of the connecting section. The distance L1 from the outer wall of the notch to the axis of the flanging section is less than the radius R of the flanging section. The drive assembly is connected to the push rod and is used to push the push rod to reciprocate along the centerline of the guide die.

[0007] The metal tube punching and flanging equipment provided in this application includes a metal tube punching and flanging assembly. During the flanging process, the punching part of the punch first punches out the flanging hole from the wall of the tube to be processed, and then the main body performs flanging processing on the hole. The main body includes a cylindrical flanging section and a cut-out section as a connecting section for part of the outer wall. During flanging, the flanging section plays the main flanging role. Then, as the punch continues to move (extending or retracting), the main body of the punch is subjected to the inner wall of the flanging hole and the inner wall of the through hole. The notch reduces frictional resistance, decreasing the resistance encountered by the punch against the inner wall of the flanging hole and the wall of the through hole during movement. This increases the punch's lifespan and further reduces the cost of flanging hole processing. Additionally, during the installation of the metal tube punching and flanging assembly, the punch must be installed before the push rod. The notch allows for pre-positioning of the punch, preventing it from rotating or wobbling within the through hole. Furthermore, it guides the punch's movement during flanging hole processing, ensuring its stability. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a pipe fitting processing equipment;

[0009] Figure 2 for Figure 1 Enlarged image;

[0010] Figure 3 A three-dimensional schematic diagram of a metal tube punching and flanging assembly;

[0011] Figure 4 This is a three-dimensional schematic diagram of the punch.

[0012] Figure 5 This is a frontal projection of the punch.

[0013] Figure 6 This is a left-side projection of the punch.

[0014] Figure 7 This is a top-view projection of the punch.

[0015] Figure 8 A three-dimensional schematic diagram of the guide tube mold;

[0016] Figure 9 A projection diagram of the guide tube mold;

[0017] Figure 10 This is a cross-sectional view of the guide tube mold;

[0018] Figure 11 This is a three-dimensional schematic diagram of the push rod;

[0019] Figure 12 This is a schematic diagram of the pipe fitting after punching and flanging in the current technology;

[0020] Figure 13 This is a schematic diagram of the pipe fitting to be processed after punching and flanging in this application;

[0021] Figure 14 This refers to the punching and flanging process in this application.

[0022] 100. Metal pipe punching and flanging assembly; 1. Guide mold; 2. Punch; 10. Through hole; 11. Through hole; 12. Inner wall; 13. Fitting part; 20. Punching part; 21. Main body; 22. Transition part; 221. Conical part; 222. Rounded corner; 211. Flanging section; 212. Connecting section; 23. Cutting part; 231. First cutting part; 232. Second cutting part; 233. Arc-shaped part; 201. End face; 3. Push rod; 213. Opening groove; 31. Inclined rod section; 4. Bottom surface; 200. Drive assembly; 300. Fixture assembly; 5. Pipe to be processed; 121. First inner wall; 122. Second inner wall; 2130. Bottom wall; 51. Flanging hole; Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Air conditioning piping systems typically feature a main pipe with flanged holes on its sidewalls to increase the welding area between branch pipes and the main pipe, thereby improving connection strength. However, in current technology, the cutting tool of the flanged die experiences significant resistance during operation, resulting in a short tool life and increased processing costs. To address these issues, this application provides a metal pipe punching and flanged assembly 100, which can improve the service life of the flanged cutting tool and reduce the processing costs of the flanged holes.

[0025] See Figures 1-14 A metal tube punching and flanging assembly 100 includes a guide tube mold 1, a punch 2, and a push rod 3. The guide tube mold 1 has a through hole 11 in its tube wall, which penetrates the tube walls on opposite sides of the guide tube mold 1. The punch 2 is disposed in the through hole 11, and the push rod 3 is slidably engaged with the punch 2. The push rod 3 can push the punch 2 to move in the through hole 11 in a direction perpendicular to the center line of the guide tube mold 1, extending and retracting. The punch 2 includes a main body 21 and a punching part 20 disposed at one end of the main body 21. The main function of the punching part 20 is to pre-process the flanging hole by punching the flanging hole in the wall of the tube 5 to be processed. The main body 21 includes a flanged section 211 and a connecting section 212. The flanged section 211 is closer to the punching section 20 than the connecting section 212. The projection area of ​​the connecting section 212 on the plane perpendicular to the axis of the punch 2 is smaller than that of the flanged section 211.

[0026] During the processing of the flanging hole, the punch 2 of the metal tube punching and flanging assembly 100 first punches the wall of the tube 5 to be processed with the punching part 20 to create the flanging hole, and then the main body 21 performs stretching and flanging processing on the flanging hole. The main body 21 includes a cylindrical flanging section 211 and a connecting section 212 with a cut part 23 as part of the wall. The flanging section 211 is mainly used to stretch and flanging the flanging hole. The axial length of the flanging section 211 is greater than or equal to the flanging height of the flanging hole of the tube 5 to be processed. After the flanging is formed, as the punch 2 continues to extend, the connecting section 212 will enter the flanging hole, and then the next flanging hole will be processed. At this time, the punch 2 will retract within the through hole 11. During the extension and retraction movement, the main body 21 will be subject to resistance from the inner wall of the through hole 11 and the inner wall of the flanging hole. By setting the projected area of ​​the connecting section 212 to be smaller than the projected area of ​​the flanging section 211, the resistance from the inner wall of the through hole 11 and the inner wall of the flanging hole during the movement of the punch 2 can be reduced. This can relatively improve the life of the punch 2, thereby further reducing the cost of flanging hole processing. In addition, this metal tube punching and flanging assembly can complete punching and flanging simultaneously, which is more efficient and produces better product consistency compared to the separate processing in the current technology.

[0027] Furthermore, the guide tube mold 1 includes a through hole portion 10, which includes a through hole 11, an inner wall portion 12, and a mating portion 13. The mating portion 13 forms part of the inner wall portion 12, and the mating portion 13 and the cut portion 23 are in sliding engagement. Specifically, the inner wall portion 12 includes a first inner wall portion 121 and a second inner wall portion 122. The first inner wall portion 121 is adapted to the shape of the flanged section 211 and is in sliding engagement; the second inner wall portion 122 is adapted to the shape of the connecting section 212 and is in sliding engagement; the mating portion 13 forms part of the second inner wall portion 122. The punch 2 includes a cut portion 23, and the mating portion 13 and the cut portion 23 are in sliding engagement. Furthermore, the cut portion 23 forms part of the outer wall portion of the connecting section 212, and the distance L1 from the outer wall surface of the cut portion 23 to the axis of the punch 2 is less than that of the flanged section 212. The distance L2 from the outer wall of section 211 to the axis of punch 2 (not shown in the figure) is generally cylindrical. The outer diameter of the flange section 211 is R. Therefore, the axis of punch 2 and the axis of flange section 211 are consistent. So, it can also be considered that the distance L1 from the outer wall of the cut part 23 to the axis of punch 2 is less than the radius R of flange section 211. When flange section 211 is cylindrical, L2 = R. The main function of flange section 211 is to stretch and flange the hole to be flanged, and finally form the flanged hole. By setting the mating part 13, the mating part 13 and the cutting part 23 are slidably engaged. On the one hand, during the installation of the metal pipe punching and flanging assembly, the punch 2 needs to be installed first, and then the push rod 3 needs to be installed. The setting of the cutting part 23 and the mating part 13 can pre-position the punch 2 to prevent the punch 2 from rotating or shaking in the through hole 11. On the other hand, during the processing of the flanging hole, the punch 2 can also be guided to ensure the stability of the punch 2's operation, thereby ensuring the accuracy of the pipe punching process.

[0028] Further reading Figures 4-7 The punch 2 includes a punching section 20, which is an elliptical cylinder with an elliptical cross-section. The major axis of the ellipse is parallel to the center line of the guide tube mold 1. The end face 201 of the punching section 20 is a concave arc surface. The center line of the punching section 20 coincides with the axis of the flange section 211 and is perpendicular to the center line of the guide tube mold 1. This allows the contour of the punching portion 20 end face 201 of the punch 2 to form a cutting edge, which is used to shear and punch the pipe wall of the pipe to be processed 5. After punching the pipe wall of the pipe to be processed 5, an elliptical hole to be flanged is formed on the pipe wall of the pipe to be processed 5, and the major axis of the elliptical hole is parallel to the center line of the pipe to be processed 5. This makes the circumferential dimension of the flanged hole on the pipe wall of the pipe to be processed 5 smaller than the axial dimension, thereby ensuring that the edge height of the flanged hole is basically consistent after flanged, improving the flatness of the flanged hole opening of the pipe to be processed 5, and ensuring the welding quality and welding strength.

[0029] The punching section 20 of the punch 2 is used to punch holes in the pipe fitting 5 to be processed, while the main body section 21 of the punch 2 is used for stretching and flanging the pipe fitting 5 to be processed. The punching section 20 and the main body section 21 are connected by a transition section 22. In other words, the punching section 20 and the flanging section 211 are connected by the transition section 22, which ensures a smooth transition between the punching section 20 and the flanging section 21. After pre-punching the pipe fitting 5 to be processed, the transition section 22 can pre-flang the pipe wall of the pipe fitting 5, and then the flanging section 211 flangs the hole to be flanged in the pipe fitting 5, thereby protecting the pipe wall of the pipe fitting 5 from damage during flanging and improving the flanging quality. Specifically, Figure 6 As shown, the transition portion 22 includes a conical portion 221 and a rounded portion 222. The rounded portion 222 is a machined transition fillet. The conical portion 221 is closer to the punching portion 20 than the rounded portion 222. The quality of the flanging is greatly related to the size of the cone angle α of the conical portion 221. If the cone angle α of the conical portion 221 is too large, there is no buffer during flanging, which easily leads to "necking". The wall strength of the flanged hole with "necking" is insufficient and it is easy to break. If the cone angle α is too small, the impact force generated by the punch during flanging is too large, which will also affect the flanging quality of the flanged hole. Preferably, the cone angle α = 116°.

[0030] During the flanging process, the guide mold 1 of the metal tube punching and flanging assembly 100 needs to be placed inside the tube 5 to be processed. After processing one flanging hole, the tube 5 to be processed needs to be moved to a suitable position to process other flanging holes. Therefore, it is necessary to ensure that the tube 5 to be processed can move smoothly outside the guide mold 1. That is to say, after the flanging process is completed, the punch 2 of the metal tube punching and flanging assembly 100 retracts into the through hole 11. When the tube 5 to be processed moves, the punch 2 should not interfere with the inner wall of the tube 5 to be processed. Therefore, it is necessary to set the height H of the punch 2 to be less than the outer diameter D of the guide mold 1 along the axial direction of the punch 2, where D=2R.

[0031] In the flanging process, the hole to be flanged is first formed by the punching section 20, and then the flanging is performed by the main body section 21. The punching section 20 is an elliptical cylinder, and at least a portion of its outer circumferential surface is an elliptical cylindrical surface. The flanging section 211 of the main body section 21 is a cylinder, and at least a portion of its outer circumferential surface is a cylindrical surface. The outer diameter 2R of the cylindrical surface of the flanging section 211 is greater than the length L of the major axis of the elliptical surface of the punching section 20. This arrangement allows sufficient pipe material to be reserved in the lower part of the pipe wall after the elliptical hole is formed by punching in the punching section 20, and then the flanging is performed by the flanging section 211. This ensures that the flanging height is consistent throughout the flanging hole, thus improving the welding quality.

[0032] Furthermore, the punch 2 includes a notch 23, which forms part of the outer wall of the connecting section 212. The punch 2 can extend or retract along the through hole 11 of the guide die 1. The axis of the flange section 211 coincides with the axis of the through hole 11, and the axis of the through hole 11 intersects perpendicularly with the center line of the guide die 1. Therefore, the axis of the flange section 211 and the center line of the guide die 1 intersect perpendicularly. A plane passing through the axis of the flange section 211 and the center line of the guide die 1 is defined as a first plane, and the surface of the notch 23 is a plane. The notch 23 is parallel to the first plane; or, the notch 23 is perpendicular to the first plane. This facilitates the processing of the punch and the assembly of the metal tube punching and flanging assembly 100. That is to say, the notch 23 can form any part of the outer wall of the connecting section 212, but for the convenience of punch processing, the convenience of metal tube punching and flanging assembly, and the overall strength of the punch 2, it is preferable that the notch 23 is parallel to the first plane.

[0033] further, Figure 5 As shown, the cut portion 23 includes a first cut portion 231 and a second cut portion 232. The first cut portion 231 is parallel to the first plane, and the second cut portion 232 is parallel to the first plane. The first cut portion 231 and the second cut portion 232 are disposed opposite each other on both sides of the first plane, and are connected by an arc-shaped portion 233. The distance from the outer surface of the arc-shaped portion 233 to the axis of the flanged section 211 is equal to the radius R of the flanged section 211. That is to say, the arc-shaped portion 233 also constitutes part of the outer wall of the connecting section 212. In other words, the cut portion 23 is formed by machining the surface of the cylinder, and the cross-section of the connecting section 212 is a straight-edged ellipse, similar to a racetrack shape, and the radius of the arc portion of the straight-edged ellipse is the same as the radius of the flanged section 211.

[0034] Figure 3As shown, the metal tube punching and flanging assembly 100 also includes a push rod 3. The push rod 3 is disposed inside the guide tube mold 1 and moves back and forth along the center line of the guide tube mold 1. The push rod 3 is connected to the punch 2 and drives the punch 2 to move in extension and retraction. The punch 2 body 21 is provided with an opening groove 213 with a T-shaped cross section. Specifically, the connecting section 212 is provided with an opening groove 213 with a T-shaped cross section that penetrates the walls on both sides of the connecting section 212. The bottom wall of the opening groove 213 is an inclined surface. The push rod 3 includes an inclined rod segment 31. The inclined rod segment 31 is inserted into the cavity of the opening groove 213 and the two form a sliding fit. The inclination angle A of the opening groove 213 can be understood as: the angle between the extension direction of the opening groove 213 and the bottom surface of the punch 2, which must satisfy: 10°≤inclination angle A≤30° and the inclination angle B of the inclined rod segment 31 is the same as the inclination angle A of the opening groove 213. The size of the tilt angle A determines the magnitude of the thrust on the punch 2. If the tilt angle A is too small, the push rod 3 needs to provide a large thrust to push the punch 2 to make the extension and retraction movements; if the tilt angle A is too large, it will generate a large impact force on the punch 2. Therefore, in order to ensure that the force can be applied to the punch 2 more smoothly, it is preferable that the tilt angle A = 15°. This setting can push the punch 2 to move and generate punching force, and can also punch more smoothly, reducing damage to the punch 2.

[0035] This application also provides a metal tube punching and flanging device. Figure 1 As shown, the metal tube punching and flanging equipment includes a metal tube punching and flanging assembly 100, a drive assembly 200, and a clamping assembly 300. The clamping assembly 300 is used to clamp the tube to be processed 5. The metal tube punching and flanging assembly includes a guide tube mold 1, a punch 2, and a push rod 3. The guide tube mold 1 has a through hole 11 in its tube wall, which penetrates the tube wall of the guide tube mold 1. The punch 2 is disposed in the through hole 11 and moves in the through hole 11 in a direction perpendicular to the center line of the guide tube mold 1, extending and retracting. The punch 2 includes a punching part 20 and a main body part 21. The main body 21 and the punching part 20 are connected by a transition part 22. The main body 21 includes a flanged section 211 and a connecting section 212. The flanged section 211 is cylindrical and is closer to the punching part 20 than the connecting section 212. The punch 2 includes a cut section 23, which is at least part of the outer wall of the connecting section 212. The distance L1 from the cut section 23 to the center line of the flanged section 211 is less than the radius R of the flanged section 211. The driving assembly 200 is connected to the push rod 3 and is used to push the push rod 3 to reciprocate along the center line of the guide tube mold 1.

[0036] The main working principle of this metal pipe punching and flanging equipment for processing the flanging hole of the pipe fitting 5 to be processed is as follows: (See reference) Figure 14As shown, firstly, the guide tube mold 1, punch 2, and push rod 3 are placed at their respective positions in the clamping assembly 300; the pipe to be processed 5 is fitted onto the outside of the guide tube mold 1, and the pipe to be processed 5 is pushed to its corresponding position in the clamping assembly 300. The clamping assembly 300 holds the pipe to be processed 5, and the drive assembly 200 pushes the push rod 3 to move along the centerline of the guide tube mold 1. During punching, the inclined rod section 31 of the push rod 3 moves forward rapidly along the opening groove 213. Since the bottom of the opening groove 213 is inclined, the punch 2 is pushed up in the through hole 11 and performs a protruding movement during the forward movement of the push rod 3. At this time, the punching part 20 of the punch 2 punches through the pipe wall of the pipe to be processed 5, forming the hole to be punched. The flanging hole is now pre-formed. As the push rod 3 continues to move, the flanging section 211 stretches and flangs the hole to be flanged, forming the flanging hole. Since the punching part 20 of the punch 2 is an elliptical cylinder with an elliptical cross-section and an inwardly concave arc surface at the end face 201, and the minor axis of the ellipse is perpendicular to the axis of the pipe 5 to be processed, the end face of the flanging hole formed on the pipe wall after punching is very flat, and the periphery of the punched hole is very flat. At this point, the flanging hole is formed in one step, which improves the flatness of the flanging hole opening of the pipe 5 to be processed, ensures the welding strength and welding quality of subsequent welding, and further improves the product qualification rate. When a flanged hole needs to be punched on the wall of the pipe fitting 5, the push rod 3 is moved backward, and the punch 2 retracts into the through hole 11 of the guide tube mold 1. Then, the pipe fitting 5 is moved forward. When it reaches the next required punching position, the push rod 3 is pushed forward again, and the punch 2 is lifted. The punching part 20 of the punch 2 protrudes from the through hole 11 and punches through the pipe wall to form the flanged hole. The push rod 3 continues to move, and the flanged section 211 stretches and flanges the flanged hole to form the flanged hole, thus completing the flanged hole processing again. If flanged holes need to be processed again, the above operation can be repeated, which will not be described in detail here. The metal pipe punching and flanged assembly 100 of this application can complete the one-time forming of the flanged hole, which can ensure the quality stability of the product, improve the product quality, and increase the product qualification rate. Compared with the production steps of traditional production processes, it improves production efficiency and reduces processing costs.

[0037] The above examples illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely illustrative and are intended to help understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A metal tube punching and flanging assembly (100), comprising a guide tube mold (1), a punch (2), and a push rod (3), characterized in that, The guide tube mold (1) has a through hole (11) in its tube wall, which penetrates the tube walls on opposite sides of the guide tube mold (1). The punch (2) is disposed in the through hole (11), and the push rod (3) slides with the punch (2). The push rod (3) can push the punch (2) to move in the through hole (11) in a direction perpendicular to the center line of the guide tube mold (1) to extend and retract. The punch (2) includes a main body (21) and a punching part (20) disposed at one end of the main body (21). The main body (21) includes a flanged section (211) and a connecting section (212). The flanged section (211) is closer to the punching part (20) than the connecting section (212). The projection area of ​​the connecting section (212) on the plane perpendicular to the axis of the punch (2) is smaller than the projection area of ​​the flanged section (211).

2. The metal tube punching and flanging assembly according to claim 1, characterized in that, The guide tube mold (1) includes a through hole (10), the through hole (10) includes a through hole (11), the through hole (10) includes an inner wall (12), the inner wall (12) is adapted to the shape of the main body (21) and slides in fit; the inner wall (12) includes a second inner wall (122), the second inner wall (122) is adapted to the shape of the connecting section (212) and slides in fit; the through hole (10) includes a mating part (1 3) The mating part (13) forms part of the second inner wall part (122); the punch (2) includes a cut part (23), the cut part (23) forms part of the outer wall part of the connecting section (212), the distance L1 from the outer wall surface of the cut part (23) to the axis of the punch (2) is less than the distance L2 from the outer wall surface of the flange section (211) to the axis of the punch (2); the mating part (13) and the cut part (23) are in sliding fit.

3. The metal tube punching and flanging assembly according to claim 2, characterized in that, The axis of the flanged section (211) intersects perpendicularly with the center line of the guide tube mold (1). The plane passing through the axis of the flanged section (211) and the center line of the guide tube mold (1) is defined as the first plane. The surface of the cut portion (23) is a plane. The cut portion (23) is parallel to the first plane; or, the cut portion (23) is perpendicular to the first plane.

4. The metal tube punching and flanging assembly according to claim 3, characterized in that, The cut portion (23) includes at least a first cut portion (231) and a second cut portion (232). The first cut portion (231) is parallel to the first plane, and the second cut portion (232) is parallel to the first plane. The first cut portion (231) and the second cut portion (232) are disposed opposite to each other on both sides of the first plane. The first cut portion (231) and the second cut portion (232) are connected by an arc-shaped portion (233). The distance from the outer surface of the arc-shaped portion (233) to the axis of the flanged section (211) is equal to the radius R of the flanged section (211).

5. The metal tube punching and flanging assembly according to any one of claims 1-4, characterized in that, Along the axial direction of the punch (2), the height H of the punch (2) is less than the outer diameter D of the guide tube mold (1).

6. The metal tube punching and flanging assembly according to claim 5, characterized in that, The punched portion (20) is elliptical cylindrical, and the length L of the major axis of the punched portion (20) is less than the outer diameter 2R of the flanged section (211).

7. The metal tube punching and flanging assembly according to claim 6, characterized in that, The cross-section of the punched part (20) is elliptical. The major axis of the punched part (20) is parallel to the center line of the guide tube mold (1). The end face (201) of the punched part (20) is a concave arc surface. The center line of the punched part (20) coincides with the axis of the flanged section (211) and is perpendicular to the center line of the guide tube mold (1).

8. The metal tube punching and flanging assembly according to claim 5, characterized in that, The punched section (20) and the flanged section (211) are connected by a transition section (22), which includes a conical section (221) and a rounded section (222). The conical section (221) is closer to the punched section (20) than the rounded section (222), and the cone angle α of the conical section (221) is 116°.

9. The metal tube punching and flanging assembly according to claim 6 or 7, characterized in that, The punched section (20) and the flanged section (211) are connected by a transition section (22), which includes a conical section (221) and a rounded section (222). The conical section (221) is closer to the punched section (20) than the rounded section (222), and the cone angle α of the conical section (221) is 116°.

10. The metal tube punching and flanging assembly according to claim 8, characterized in that, The metal tube punching and flanging assembly (100) includes a push rod (3), which is disposed in the guide tube mold (1) and moves back and forth along the center line of the guide tube mold (1). The push rod (3) is connected to the punch (2) and drives the punch (2) to move in a protruding and retracting manner. The connecting section (212) is provided with an opening groove (213) that penetrates the wall of the connecting section (212). The bottom wall (2130) of the opening groove (213) is an inclined surface. The push rod (3) includes an inclined rod segment (31), which slides with the opening groove (213). The inclination angle B of the inclined rod segment (31) is the same as the inclination angle A of the opening groove (213). The inclination angle A of the opening groove (213) satisfies: 10°≤A≤30°.

11. The metal tube punching and flanging assembly according to claim 9, characterized in that, The metal tube punching and flanging assembly (100) includes a push rod (3), which is disposed in the guide tube mold (1) and moves back and forth along the center line of the guide tube mold (1). The push rod (3) is connected to the punch (2) and drives the punch (2) to move in a protruding and retracting manner. The connecting section (212) is provided with an opening groove (213) that penetrates the wall of the connecting section (212). The bottom wall (2130) of the opening groove (213) is an inclined surface. The push rod (3) includes an inclined rod segment (31), which slides with the opening groove (213). The inclination angle B of the inclined rod segment (31) is the same as the inclination angle A of the opening groove (213). The inclination angle A of the opening groove (213) satisfies: 10°≤A≤30°.

12. A metal tube punching and flanging device, comprising a metal tube punching and flanging assembly (100) according to any one of claims 1-11, a driving assembly (200), and a clamping assembly (300), wherein the clamping assembly (300) is used to clamp the tube to be processed (5), characterized in that, The flanged section (211) is cylindrical, and the punch (2) includes a cut (23). The cut (23) forms part of the outer wall of the connecting section (212). The distance L1 from the outer wall of the cut (23) to the axis of the flanged section (211) is less than the radius R of the flanged section (211). The drive assembly (200) is connected to the push rod (3) and is used to push the push rod (3) to reciprocate along the center line of the guide tube mold (1).

Images