Integrated forming punching method for pipe connecting section

Abstract

The invention discloses an integral forming punching method for a connecting pipe section, belongs to the technical field of connecting pipe section forging forming, and aims to solve the problems of complicated forming process flow, long time and low structural strength of the connecting pipe section in the prior art. According to the method, a connecting pipe section blank is arranged outside two horizontal punching cones in a sleeving mode, the two horizontal punching cones are symmetrically arranged relative to the axis of the connecting pipe section blank, a gap is formed between the two horizontal punching cones, and the small ends of the horizontal punching cones are aligned with side pipe protrusions; a vertical reciprocating driving mechanism is arranged above the horizontal punching cones, a vertical extrusion head is arranged at the output end of the vertical reciprocating driving mechanism, and the vertical extrusion head is aligned to a gap between the two horizontal punching cones; and the vertical reciprocating driving mechanism is started, the vertical extrusion head moves downwards to extrude the horizontal punching cones, so that the two horizontal punching cones are far away from each other, and the horizontal punching cones move in the direction close to the side pipe protrusions and are inserted into the positioning holes. The punching die can be used for integrally forming and punching the connecting pipe section.

Description

Technical Field

[0001] The invention belongs to the technical field of forging and forming a connecting pipe section, and in particular relates to an integral forming and punching method for a connecting pipe section. Background Art

[0002] Among the pressurized water reactor RPV forgings, the nozzle section is the cylinder forging with the largest cross-section and the most complex shape. The traditional nozzle section is welded by the nozzle barrel, nozzle flange and nozzle group, and the nozzle group includes the inlet nozzle, outlet nozzle and injection nozzle.

[0003] Taking the pipe section structure of 1 pipe tube, 1 pipe flange, 2 inlet pipes, 4 outlet pipes and 2 injection pipes as an example, split forging is adopted, which requires forging 10 forgings separately, and then welding the 10 forgings through 9 welds to form the pipe section.

[0004] Obviously, the above process flow is complicated and there are many welds, which leads to a long forming time of the pipe section and low structural strength. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide an integral forming punching method for a connecting pipe segment, so as to solve the problems of the connecting pipe segment in the prior art that the forming process flow is complicated, the time is long and the structural strength is low.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions.

[0007] The present invention provides an integral punching method for a pipe section, comprising the following steps:

[0008] Step 1: providing a pipe section blank, the pipe section blank comprising a pipe tube and a side pipe protrusion arranged on the outer wall of the pipe tube;

[0009] Step 2: The pipe section blank is sleeved outside two horizontal punching cones, the two horizontal punching cones are symmetrically arranged relative to the axis of the pipe section blank, and there is a gap between the two horizontal punching cones, and the small ends of the horizontal punching cones are aligned with the side pipe protrusions;

[0010] Step 3: a vertical reciprocating drive mechanism is arranged above the horizontal punching cone, a vertical extrusion head is arranged at the output end of the vertical reciprocating drive mechanism, and the vertical extrusion head is aligned with the gap between the two horizontal punching cones;

[0011] Step 4: Turn on the vertical reciprocating drive mechanism, and the vertical extrusion head moves downward to extrude the horizontal punching cone, so that the two horizontal punching cones move away from each other. The horizontal punching cone moves toward the side tube protrusion and is inserted into the positioning hole to complete the one-piece punching of the pipe section.

[0012] Further, step 4 includes the following steps:

[0013] Place the horizontal extrusion column on the end of the horizontal punching cone close to the vertical extrusion head;

[0014] The vertical reciprocating drive mechanism is turned on, and the vertical extrusion head moves downward to extrude the horizontal extrusion column, so that the two horizontal punching cones move away from each other. The horizontal punching cone moves toward the side pipe protrusion and is inserted into the positioning hole to complete the one-piece punching of the pipe section.

[0015] Furthermore, the horizontal extrusion column includes a first extrusion column, a third extrusion column and a second extrusion column which are sequentially arranged in a direction gradually away from the vertical extrusion head.

[0016] Further, step 4 includes the following steps:

[0017] Step 41: placing a first extrusion column on one end of the horizontal punching cone close to the vertical extrusion head;

[0018] Step 42: The vertical reciprocating drive mechanism is turned on, and the output end of the vertical reciprocating drive mechanism and the vertical extrusion head are integrally moved downward, driving the first extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the horizontal punching cone is inserted into the positioning hole, completing the first punching;

[0019] Step 43: the output end of the vertical reciprocating drive mechanism and the vertical extrusion head are integrally moved upward, and the second extrusion column is placed between the first extrusion column and the horizontal punching cone;

[0020] Step 44: the output end of the vertical reciprocating drive mechanism and the vertical extrusion head move downward to drive the first extrusion column, the second extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the depth of the horizontal punching cone inserted into the positioning hole increases, and the second punching is completed;

[0021] Step 45: The output end of the vertical reciprocating drive mechanism and the vertical extrusion head move upward to place the third extrusion column between the second extrusion column and the first extrusion column;

[0022] Step 46: The output end of the vertical reciprocating drive mechanism and the vertical extrusion head move downward to drive the first extrusion column, the third extrusion column, the second extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the depth of the horizontal punching cone inserted into the positioning hole increases again, completing the third punching.

[0023] Furthermore, the downward movement speed of the vertical extrusion head is 10 to 20 mm / s.

[0024] Furthermore, the lower end of the vertical extrusion head is tapered.

[0025] Furthermore, the following steps are included between step 2 and step 3:

[0026] Step a: providing a support mold and a limit platform, the side wall of the support mold is provided with a mounting hole, the side wall of the mounting hole is conformal to the final molding shape of the outer wall of the side tube, and the protrusion of the side tube corresponds to the position of the mounting hole;

[0027] Step b: placing the limit table in the support mold;

[0028] Step c: placing the pipe section blank, the horizontal punching cone and the horizontal extrusion column in the support mold, wherein the pipe section blank is located between the limiting platform and the support mold, and the horizontal punching cone and the horizontal extrusion column are placed on the limiting platform.

[0029] Furthermore, a positioning hole penetrating the connecting tube and the side tube protrusion is provided at a position on the inner wall of the connecting tube corresponding to the side tube protrusion.

[0030] Further, in step 2, the small end of the horizontal punching cone is aligned with the positioning hole.

[0031] Furthermore, step 1 also includes the following steps:

[0032] Prepare the pipe section blank.

[0033] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0034] A) The one-piece punching method for the pipe section provided by the present invention adopts a vertical extrusion head in combination with a horizontal punching cone, and the overall structure is simple. The vertical extrusion head is driven downward by a vertical reciprocating drive mechanism to extrude the horizontal punching cone, so that the vertical force of the vertical reciprocating drive mechanism is directly converted into a horizontal force, thereby ensuring that the vertical force of the vertical reciprocating drive mechanism is effectively transmitted, thereby improving the efficiency and quality of the one-piece punching.

[0035] B) The one-piece punching method for the connecting pipe section provided by the present invention can simultaneously process two symmetrically arranged side pipe protrusions into side pipes through the arrangement of two horizontal punching cones. Since the two horizontal punching cones are symmetrically arranged relative to the axis of the vertical extrusion head, the symmetry accuracy and one-piece punching efficiency of the two side pipes obtained can be improved.

[0036] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0038] Figure 1 A flow chart of an integrally formed punching method for a pipe section provided in Embodiment 1 of the present invention;

[0039] Figure 2 This is a flow chart of preparing a connecting pipe section blank in the integral forming and punching method for connecting pipe sections provided in the first embodiment of the present invention, and the dimensions marked in the figure are in mm.

[0040] Reference numerals:

[0041] 1-pipe section blank; 2-supporting die; 3-limiting platform; 4-horizontal punching cone; 5-vertical reciprocating drive mechanism; 6-vertical extrusion head; 7-first extrusion column; 8-second extrusion column; 9-third extrusion column; 10-horizontal punching cone. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0043] Embodiment 1

[0044] This embodiment provides a one-piece punching method for a pipe section, see Figure 1 , including the following steps:

[0045] Step 1: providing a pipe section blank 1, the pipe section blank 1 comprising a pipe tube and a side pipe protrusion arranged on the outer wall of the pipe tube, and a positioning hole penetrating the pipe tube and the side pipe protrusion is provided at a position corresponding to the side pipe protrusion on the inner wall of the pipe tube;

[0046] Step 2: The pipe section blank 1 is sleeved outside the two horizontal punching cones 4. The two horizontal punching cones 4 are symmetrically arranged relative to the axis of the pipe section blank 1, and there is a gap between the two horizontal punching cones 4. The small ends of the horizontal punching cones 4 are aligned with the positioning holes;

[0047] Step 3: a vertical reciprocating drive mechanism 5 is arranged above the horizontal punching cone 4, a vertical extrusion head 6 is arranged at the output end of the vertical reciprocating drive mechanism 5, the vertical extrusion head 6 is aligned with the gap between the two horizontal punching cones 4, the axis of the vertical reciprocating drive mechanism 5, the axis of the vertical extrusion head 6 and the axis of the pipe section blank 1 are coincident, and the axis of the horizontal punching cone 4 is perpendicular to the axis of the vertical extrusion head 6;

[0048] Step 4: Turn on the vertical reciprocating drive mechanism 5, and the vertical extrusion head 6 moves downward to extrude the horizontal punching cone 4, so that the two horizontal punching cones 4 are separated, and each horizontal punching cone 4 moves toward the side tube protrusion and is inserted into the positioning hole, completing the integral punching of the pipe section.

[0049] Compared with the prior art, the one-piece punching method for the connecting pipe section provided in this embodiment, on the one hand, adopts the form of a vertical extrusion head 6 cooperated with a horizontal punching cone 4, and the overall structure is simple. The vertical extrusion head 6 is driven downward by the vertical reciprocating drive mechanism 5 to extrude the horizontal punching cone 4, so that the vertical force of the vertical reciprocating drive mechanism 5 is directly converted into a horizontal force, thereby ensuring that the vertical force of the vertical reciprocating drive mechanism 5 is effectively transmitted, thereby improving the one-piece punching efficiency and quality; on the other hand, through the arrangement of two horizontal punching cones 4, two symmetrically arranged side tube protrusions can be processed into side tubes at the same time. Since the two horizontal punching cones 4 are symmetrically arranged relative to the axis of the vertical extrusion head 6, the symmetry accuracy of the two side tubes obtained and the one-piece punching efficiency can be improved.

[0050] Considering that the sizes of the vertical extrusion head 6 and the horizontal punching cone 4 are limited, resulting in a small displacement of the horizontal punching cone 4, which affects the integral punching. Therefore, the above step 4 includes the following steps:

[0051] Place the horizontal extrusion column on one end of the horizontal punching cone 4 close to the vertical extrusion head 6;

[0052] The vertical reciprocating drive mechanism 5 is turned on, and the vertical extrusion head 6 moves downward to extrude the horizontal extrusion column, so that the two horizontal punching cones 4 are separated, and each horizontal punching cone 4 moves toward the direction close to the side tube protrusion and is inserted into the positioning hole, completing the integral punching of the pipe section.

[0053] Exemplarily, the number of horizontal extrusion columns is three, namely, a first extrusion column 7, a second extrusion column 8 and a third extrusion column 9. Accordingly, the above step 4 includes the following steps:

[0054] Step 41: placing the first extrusion column 7 at one end of the horizontal punching cone 4 close to the vertical extrusion head 6;

[0055] Step 42: the vertical reciprocating drive mechanism 5 is turned on, the output end of the vertical reciprocating drive mechanism 5 and the vertical extrusion head 6 are integrally moved downward, and the first extrusion column 7 and the horizontal punching cone 4 are driven to move toward the pipe section blank 1, so that the horizontal punching cone 4 is inserted into the positioning hole, and the first punching is completed;

[0056] Step 43: the output end of the vertical reciprocating drive mechanism 5 and the vertical extrusion head 6 are integrally moved upward, and the second extrusion column 8 is placed between the first extrusion column 7 and the horizontal punching cone 4;

[0057] Step 44: the output end of the vertical reciprocating drive mechanism 5 and the vertical extrusion head 6 move downward to drive the first extrusion column 7, the second extrusion column 8 and the horizontal punching cone 4 to move toward the pipe section blank 1, so that the depth of the horizontal punching cone 4 inserted into the positioning hole increases, and the second punching is completed;

[0058] Step 45: the output end of the vertical reciprocating drive mechanism 5 and the vertical extrusion head 6 move upward to place the third extrusion column 9 between the second extrusion column 8 and the first extrusion column 7;

[0059] Step 46: The output end of the vertical reciprocating drive mechanism 5 and the vertical extrusion head 6 move downward to drive the first extrusion column 7, the third extrusion column 9, the second extrusion column 8 and the horizontal punching cone 4 to move toward the pipe section blank 1, so that the depth of the horizontal punching cone 4 inserted into the positioning hole increases again, completing the third punching.

[0060] In this way, by using the horizontal punching cone 4, vertical extrusion head 6, first extrusion column 7, third extrusion column 9 and second extrusion column 8 that cooperate with each other, it is possible to achieve effective transmission of the force applied by the vertical extrusion head 6. In addition, due to the setting of the first extrusion column 7, the third extrusion column 9 and the second extrusion column 8, the horizontal displacement of the horizontal punching cone 4 can be increased.

[0061] In order to ensure the punching quality, illustratively, the downward movement speed of the vertical extrusion head 6 is 10 to 20 mm / s.

[0062] In order to be able to directly convert the vertical force of the vertical reciprocating drive mechanism 5 into a horizontal force, the diameter of the lower end of the vertical extrusion head 6 gradually decreases from top to bottom, that is, the lower end of the vertical extrusion head 6 is conical, so that the gap size between the two horizontal punching cones 4 is changed by changing the cross-section.

[0063] Correspondingly, the end face of the first extrusion column 7 facing the vertical extrusion head 6 is a slope, and the slope gradually approaches the axis of the vertical extrusion head 6 from top to bottom. The shape of the first extrusion column 7 is cylindrical, and the end face of the first extrusion column 7 away from the vertical extrusion head 6 is parallel to the axis of the vertical extrusion head 6. The shape of the third extrusion column 9 and the second extrusion column 8 is cylindrical, and the two end faces of the third extrusion column 9 and the second extrusion column 8 are parallel to the axis of the vertical extrusion head 6.

[0064] From the perspective of matching, the inclination angle of the end face of the first extrusion column 7 toward the vertical extrusion head 6 is equal to the inclination angle of the lower end of the vertical extrusion head 6, so that there is line contact between the lower end of the vertical extrusion head 6 and the first extrusion column 7 during the downward movement of the vertical extrusion head 6.

[0065] More preferably, the end surface of the first extrusion column 7 facing the vertical extrusion head 6 is conformal with the lower end of the vertical extrusion head 6, so that there is surface contact between the lower end of the vertical extrusion head 6 and the first extrusion column 7, thereby ensuring effective transmission of force.

[0066] In order to limit the outer wall of the side tube protrusion and ensure the molding quality of the outer wall of the side tube, the following steps are also included between step 2 and step 3:

[0067] Step a: providing a support mold 2 and a limit platform 3, the side wall of the support mold 2 is provided with a mounting hole, the side wall of the mounting hole is conformal to the final molding shape of the outer wall of the side tube, and the protrusion of the side tube corresponds to the position of the mounting hole;

[0068] Step b: placing the limiting platform 3 in the supporting mold 2;

[0069] Step c: Place the pipe section blank 1, the horizontal punching cone 4 and the horizontal extrusion column in the support mold 2, the pipe section blank 1 is located between the limiting platform 3 and the support mold 2, and the horizontal punching cone 4 and the horizontal extrusion column are placed on the limiting platform 3.

[0070] It should be noted that, driven by the horizontal punching cone 4 , the side tube protrusion is squeezed into the mounting hole, and the outer wall of the side tube protrusion is in close contact with the hole wall of the mounting hole to form the final shape of the side tube.

[0071] Taking into account that the horizontal punching cone 4 and the horizontal extrusion column will be squeezed by the side tube protrusion and the vertical extrusion head 6, the shapes of the horizontal punching cone 4 and the horizontal extrusion column are both cylindrical, which makes them easy to roll and affects the transmission of force. Therefore, the upper end face of the above-mentioned limit platform 3 is provided with a limit groove, and the horizontal punching cone 4 and the horizontal extrusion column are placed in the limit groove. The circumferential rolling of the horizontal punching cone 4 and the horizontal extrusion column is limited by the groove wall of the limit groove to ensure the effective transmission of force.

[0072] In order to increase the vertical displacement of the vertical extrusion head 6, and thus increase the horizontal displacement of the horizontal punching cone 4 and the horizontal extrusion column, an insertion groove is provided on the above-mentioned limit platform 3, and the inclination angle of the insertion groove wall is equal to the inclination angle of the lower end of the vertical extrusion head 6. The vertical extrusion head 6 moves downward and is inserted into the insertion groove, thereby being able to drive the horizontal punching cone 4 and the horizontal extrusion column to a greater extent to be inserted into the side tube protrusion.

[0073] Exemplarily, the inclination angle of the wall of the insertion groove, the inclination angle of the lower end of the vertical extrusion head 6 and the inclination angle of the end surface of the first extrusion column 7 toward the vertical extrusion head 6 are all 15 to 30 degrees.

[0074] In order to facilitate the insertion of the vertical extrusion head 6 into the insertion groove, the bottom width of the insertion groove is greater than the bottom diameter of the vertical extrusion head 6. Exemplarily, the ratio of the bottom width of the insertion groove to the bottom diameter of the vertical extrusion head 6 is 1.1:1 to 1.2:1.

[0075] It is worth noting that the alignment accuracy between the horizontal punching cone 4 and the positioning hole is one of the key factors affecting the side tube forming accuracy. In order to improve the alignment accuracy between the horizontal punching cone 4 and the positioning hole, a positioning column is provided at one end of the horizontal punching cone 4 facing the positioning hole. The diameter of the positioning column is smaller than the diameter of the horizontal punching cone 4, and the positioning column is inserted into the positioning hole. In this way, by setting the positioning column, the positioning column is inserted into the positioning hole before punching, which can guide the overall horizontal displacement of the horizontal punching cone 4 and effectively improve the alignment accuracy between the horizontal punching cone 4 and the positioning hole.

[0076] It is understandable that in order to obtain the pipe section blank 1, see Figure 2 , the above step 1 also includes the following steps:

[0077] Step A: providing a cylindrical blank, wherein an annular belt is provided on the outer wall of the cylindrical blank;

[0078] Step B: placing the cylindrical blank between the upper special-shaped cover plate and the lower special-shaped cover plate, pressing and then expanding the hole (for example, horse bar expansion), so that the upper end surface of the cylindrical blank forms upper protrusions and upper grooves arranged alternately, and the lower end surface of the cylindrical blank forms lower protrusions and lower grooves arranged alternately, and in the axial direction of the cylindrical blank, the upper protrusions correspond to the positions of the lower grooves, and the upper grooves correspond to the positions of the lower protrusions;

[0079] Step C: pressing the ring band on the cylindrical blank obtained in step B in a plum blossom pressing manner, so that the ring band is divided into a plurality of side tube protrusions arranged along the circumference of the cylindrical blank, and the side tube protrusions are divided into alternately arranged upward side tube protrusions and downward side tube protrusions, and in the axial direction of the cylindrical blank, the positions of the upper protrusion, the downward side tube protrusion and the lower groove correspond to each other, and the positions of the upper groove, the upward side tube protrusion and the lower protrusion correspond to each other;

[0080] Step D: placing the cylindrical blank obtained in step C between the upper flat cover plate and the lower flat cover plate for pressing and then expanding the hole, so that the protrusion of the downward-moving side tube moves downward, and the protrusion of the upward-moving side tube moves upward;

[0081] Step E: Positioning holes are opened on the inner wall of the cylindrical blank at positions corresponding to the upward-moving side tube protrusion and the downward-moving side tube protrusion to obtain a pipe connecting section blank 1.

[0082] It should be noted that, on the one hand, by combining a cylindrical blank with a special structure, an upper special-shaped cover plate and a lower special-shaped cover plate, an upper flat cover plate and a lower flat cover plate, pressing a plum blossom, punching and other methods, the integrated forming and overall forging of the connecting pipe section blank 1 can be achieved, and the connecting pipe section blank 1 has no welds as a whole, thereby improving the integrity of the connecting pipe section obtained by the procedure, reducing the manufacturing cost of the connecting pipe section, and shortening the manufacturing cycle of the connecting pipe section; on the other hand, through multiple hole expansions, the inner hole of the cylindrical blank can be forged to the final size in multiple times, reducing the deformation amount of each pass, ensuring the uniformity of the structure of the connecting pipe section blank 1, and reducing the occurrence of defects; on the other hand, no welding is used in the entire forging process, ensuring that the connecting pipe section blank 1 will basically not be deformed.

[0083] In order to obtain the cylindrical blank 1 with a special structure in the above step A, the above step A also includes the following steps:

[0084] Step I: providing a double vacuum steel ingot, and sequentially performing compacting, rounding, blanking, upsetting and punching on the double vacuum steel ingot;

[0085] Step II: stretching the two ends of the steel ingot obtained in step I respectively so that the outer wall of the steel ingot forms a ring band;

[0086] Step III: placing the blank obtained in step II in a mold with a groove on the inner wall, placing the ring belt in the groove, expanding the hole of the blank, and adjusting the ring belt with the groove wall of the groove.

[0087] Specifically, the upper special-shaped plate includes an upper plate body and a plurality of upper ring fan-shaped protrusions arranged on the side of the upper plate body facing the connecting pipe section blank 1. The plurality of upper ring fan-shaped protrusions are arranged at intervals and are evenly arranged at the edge of the upper plate body along the circumference of the upper plate body. When pressed, the upper ring fan-shaped protrusions form upper grooves correspondingly, and the gap between two adjacent upper ring fan-shaped protrusions forms an upper protrusion correspondingly.

[0088] The lower special-shaped plate includes a lower plate body and a plurality of lower annular fan-shaped protrusions arranged on one side of the lower plate body facing the connecting pipe section blank 1. The plurality of lower annular fan-shaped protrusions are arranged at intervals and are evenly arranged at the edge of the lower plate body along the circumference of the lower plate body. When pressed, the lower annular fan-shaped protrusions form lower grooves correspondingly, and the gap between two adjacent lower annular fan-shaped protrusions forms a lower protrusion correspondingly.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A one-piece punching method for a pipe section, characterized in that: The steps include: Step 1: providing a pipe section blank, wherein the pipe section blank comprises a pipe tube and a side pipe protrusion arranged on the outer wall of the pipe tube; Step 2: The pipe section blank is sleeved outside two horizontal punching cones, the two horizontal punching cones are symmetrically arranged relative to the axis of the pipe section blank, and there is a gap between the two horizontal punching cones, and the small ends of the horizontal punching cones are aligned with the side pipe protrusions; Step 3: a vertical reciprocating drive mechanism is arranged above the horizontal punching cone, a vertical extrusion head is arranged at the output end of the vertical reciprocating drive mechanism, and the vertical extrusion head is aligned with the gap between the two horizontal punching cones; Step 4: Turn on the vertical reciprocating drive mechanism, the vertical extrusion head moves downward to extrude the horizontal punching cone, so that the two horizontal punching cones move away from each other, and the horizontal punching cone moves toward the side tube protrusion and is inserted into the positioning hole to complete the integral punching of the pipe section.

2. The one-piece punching method for a pipe section according to claim 1, characterized in that: The step 4 comprises the following steps: Place the horizontal extrusion column on the end of the horizontal punching cone close to the vertical extrusion head; The vertical reciprocating drive mechanism is turned on, and the vertical extrusion head moves downward to extrude the horizontal extrusion column, so that the two horizontal punching cones move away from each other. The horizontal punching cone moves toward the side tube protrusion and is inserted into the positioning hole to complete the integral punching of the pipe section.

3. The one-piece punching method for a pipe section according to claim 2, characterized in that: The horizontal extrusion column comprises a first extrusion column, a third extrusion column and a second extrusion column which are sequentially arranged in a direction gradually away from the vertical extrusion head.

4. The one-piece punching method for a pipe section according to claim 3, characterized in that: The step 4 specifically includes the following steps: Step 41: placing a first extrusion column on one end of the horizontal punching cone close to the vertical extrusion head; Step 42: Turn on the vertical reciprocating drive mechanism, and the output end of the vertical reciprocating drive mechanism and the vertical extrusion head move downward as a whole, driving the first extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the horizontal punching cone is inserted into the positioning hole, completing the first punching; Step 43: the output end of the vertical reciprocating drive mechanism and the vertical extrusion head are integrally moved upward, and the second extrusion column is placed between the first extrusion column and the horizontal punching cone; Step 44: the output end of the vertical reciprocating drive mechanism and the vertical extrusion head move downward to drive the first extrusion column, the second extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the depth of the horizontal punching cone inserted into the positioning hole increases, and the second punching is completed; Step 45: the output end of the vertical reciprocating drive mechanism and the vertical extrusion head move upward to place the third extrusion column between the second extrusion column and the first extrusion column; Step 46: The output end of the vertical reciprocating drive mechanism and the vertical extrusion head move downward to drive the first extrusion column, the third extrusion column, the second extrusion column and the horizontal punching cone to move toward the pipe section blank, so that the depth of the horizontal punching cone inserted into the positioning hole increases again, completing the third punching.

5. The one-piece punching method for a pipe section according to claim 1, characterized in that: The downward movement speed of the vertical extrusion head is 10-20 mm / s.

6. The one-piece punching method for a pipe section according to claim 1, characterized in that: The lower end of the vertical extrusion head is tapered.

7. The one-piece punching method for a pipe section according to claim 1, characterized in that: The following steps are also included between step 2 and step 3: Step a: providing a support mold and a limit platform, wherein a mounting hole is provided on the side wall of the support mold, the side wall of the mounting hole is conformal to the final molding shape of the outer wall of the side tube, and the protrusion of the side tube corresponds to the position of the mounting hole; Step b: placing the limit table in the support mold; Step c: placing the connecting pipe section blank, the horizontal punching cone and the horizontal extrusion column in the supporting mold, wherein the connecting pipe section blank is located between the limiting platform and the supporting mold, and the horizontal punching cone and the horizontal extrusion column are placed on the limiting platform.

8. The one-piece punching method for a pipe section according to claim 1, characterized in that: A positioning hole penetrating the connecting tube and the side tube protrusion is arranged at a position on the inner wall of the connecting tube corresponding to the side tube protrusion.

9. The one-piece punching method for a pipe section according to claim 8, characterized in that: In step 2, the small end of the horizontal punching cone is aligned with the positioning hole.

10. The integral forming punching method for a pipe section according to any one of claims 1 to 9, characterized in that: The step 1 also includes the following steps: Prepare the pipe section blank.

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