Modular friction welding head assembly with adaptive pipe diameter structure

Abstract

The present invention discloses a modular friction welding head assembly with an adaptive pipe diameter structure, which relates to the technical field of friction welding. For the friction welding process of the pipe structure, the internal support method is mainly used to avoid the problem of out-of-roundness during the pipe welding process. The essence is to use a hydraulic drive method to drive multiple inner supporting plates to expand outward at the same time, and the inner wall positions of the two contacting pipes play an internal supporting role. The key lies in coordinating the internal stress of the pipe welding on the inner supporting plates to be converted into liquid pressure, and secondly, a passive oil sleeve and a pressure sensor are combined to form an indirect sensing structure. The essence is to form a ring-shaped simulated contour diagram of the pipe welding with the displayed values ​​of multiple pressure sensors. On the one hand, it is used to cooperate with the inner diameter of the pipe, and on the other hand, it detects and maintains the inner circle of the pipe through an indirect sensing method, and cooperates with the vibration frequency detection method to sense the outer circle of the pipe as an enhanced part in the inner circle detection process.

Description

Technical Field

[0001] The invention relates to the technical field of friction welding, and in particular to a modular friction welding head assembly with an adaptive pipe diameter structure. Background Art

[0002] The essence of friction welding is to use friction heat to achieve thermal fusion welding. In particular, attention should be paid to the two key parameters of rotation speed / amplitude and pressure. Please refer to the relevant content in the publication number CN101417368A. It should be noted that: during the friction welding operation, first, it is necessary to ensure that the two workpieces remain one rotating and the other fixed. Secondly, it is also necessary to ensure that the contact surfaces of the two workpieces are flat, smooth and free of scratches.

[0003] Friction welding is primarily used for round workpieces (tubes or bars). Compared to bar workpieces, friction welding of tubes presents the following challenges: Because the key technology of friction welding relies on thermoplastic deformation of the material, the thickness of the tube wall directly affects the heat dissipation effect, resulting in insufficient plastic flow at the root due to insufficient heat accumulation. Furthermore, the forging pressure forces the molten metal into the tube, causing flash on the inner wall.

[0004] The key is that the pipe workpiece is not designed to be solid. Considering the clamping structure and the upsetting pressure process, the pipe wall undergoes an uncontrollable plastic deformation process under axial pressure, resulting in a loss of roundness. This part particularly affects the welding and assembly accuracy of the pipe, and may even cause welding misalignment. The present invention proposes a solution to this problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a modular friction welding head assembly with an adaptive pipe diameter structure. During the friction welding process of pipe workpieces, the structural characteristics of the pipe workpiece indirectly affect the heat dissipation effect, but the key content is that there is a risk of loss of control during the thermoplastic deformation process, resulting in a loss of roundness problem.

[0006] The object of the present invention can be achieved through the following technical solutions: a modular friction welding head assembly with an adaptive pipe diameter structure, comprising a fixed clamping table, a movable clamping table, and a drive assembly, wherein a Y-axis action group is provided in the middle position of the fixed clamping table and the movable clamping table, and an inner support column is rotatably installed in the movable clamping table through the drive assembly, an active oil sleeve is provided on the outer wall position of the inner support column corresponding to the middle position of the fixed clamping table and the movable clamping table, and a passive oil sleeve is provided on the outer wall position of one end of the inner support column close to the movable clamping table;

[0007] The active oil sleeve and the passive oil sleeve are respectively provided with a push rod 2 and a push rod 1, and an inner supporting plate is provided at one end of the push rod 1. A pressure sensor is installed at one end of the dynamic clamping table corresponding to the passive oil sleeve, and a pressure plate is installed at the end position of the pressure sensor transmission shaft.

[0008] It is further configured as follows: the fixed clamping platform and the movable clamping platform are used to clamp the pipe, the setting direction of the Y-axis action group is perpendicular to the length direction of the pipe, the setting direction of the inner support column is parallel to the length direction of the pipe, and the center point of the inner support column and the center point of the pipe are on the same horizontal axis.

[0009] It is further configured as follows: a slide is slidably installed in the Y-axis action group along its length direction, the slide is symmetrically arranged along the diameter direction of the pipe, and a vibration frequency detector is installed on the slide, and a probe component is provided at the conducting end position of the vibration frequency detector.

[0010] It is further configured as follows: the probe component consists of a double-headed probe and a limiting rod, the two ends of the double-headed probe are spherical and contact the outer wall of the pipe through the Y-axis action group, and the middle section of the double-headed probe is rotationally connected to the limiting rod.

[0011] It is further configured as follows: the active oil sleeve and the passive oil sleeve are arranged in a circular array along the center point of the inner support column, and the lower end of the active oil sleeve is connected to the inside of the inner support column.

[0012] It is further configured as follows: a separation plug is installed in the inner support column, and the inner support column forms a plurality of independent oil channels matching the interior of the active oil sleeve through the separation plug.

[0013] It is further configured as follows: a pressure changing chamber and a pressure changing chamber are respectively provided in the upper and lower directions inside the active oil sleeve through the second push rod, and a pressure bearing chamber is provided in the internal position of the passive oil sleeve corresponding to the lower end of the push rod.

[0014] It is further configured as follows: a spring member is provided at the upper end position of the push rod corresponding to the pressure-bearing chamber, an oil port is provided on the outer wall position of the passive oil sleeve corresponding to the pressure-bearing chamber, the pressure-bearing chamber is not connected to the interior of the inner support column, and an oil return pipe is connected between the pressure-bearing chamber and the pressure-changing chamber.

[0015] It is further configured as follows: the pressure plate is in a curved arch shape along the direction close to the inner support column, an oil pump assembly is provided on the outside of the dynamic clamping table, and an oil port sleeve corresponding to the oil pump assembly is provided at one end of the inner support column.

[0016] The present invention has the following beneficial effects:

[0017] Improvements have been made to the process of maintaining the inner diameter during friction welding of pipes. First, the inner support column is used as the key structure, and multiple freely expandable inner support plates are added to it. The inner support plates expand freely mainly under the power of hydraulic pressure, but the hydraulic flow of hydraulic oil into the active oil sleeve is further restricted. This allows multiple inner support plates to move synchronously, thus uniformly matching the inner diameter of the pipe. Crucially, it can accommodate a variety of pipe specifications.

[0018] Based on the above content, the inner support plate only contacts the inner wall of the pipe. In order to further feedback the out-of-round problem that may occur in the pipe during friction welding, multiple pressure sensors and passive oil sleeves are set at a position away from the contact point of the pipe. The passive oil sleeve has an independent correspondence with the active oil sleeve. The key purpose is to cooperate with the further movement of the inner support plate to change the flow process of the hydraulic oil between the passive oil sleeve and the active oil sleeve. Through the conversion of hydraulic pressure to mechanical force, the specific value is obtained in real time by the pressure sensor. The display values ​​of multiple pressure sensors are used to form a ring-shaped simulation contour map of the pipe welding, which feedbacks the out-of-round problem that may exist in friction welding.

[0019] Based on the above content, a vibration sensing structure is added to the outer wall of the pipe. The vibration frequency generated during the pipe welding process is obtained as the "enhanced part" of the out-of-round detection. Specifically, a double-head probe is mainly used. The vibration frequency generated during the friction contact between the two pipes can also feedback the quality of friction welding. The key is to further sense the outer circle of the pipe by combining the force with the annular simulation contour map. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of the modular friction welding head assembly with an adaptive pipe diameter structure proposed by the present invention;

[0022] Figure 2 It is a cross-sectional view of the movable clamping table in the present invention;

[0023] Figure 3 is a cross-sectional view of the inner support column of the present invention;

[0024] Figure 4 It is a side view of the pressure sensor corresponding to the inner support column;

[0025] Figure 5 It is a side view of the inner support column corresponding to the active oil sleeve;

[0026] Figure 6 It is a cross-sectional view of the inner support column corresponding to the active oil sleeve;

[0027] Figure 7 Schematic diagram of the structure of the foreign probe in the present invention.

[0028] In the figure: 1. Fixed clamping table; 2. Vibration frequency detector; 3. Y-axis action group; 4. Dynamic clamping table; 5. Drive component; 6. Oil pump assembly; 7. Inner support plate; 8. Oil return pipe; 9. Pressure plate; 10. Pressure sensor; 11. Inner support column; 12. Oil port sleeve; 13. Active oil sleeve; 14. Passive oil sleeve; 15. Push rod 1; 16. Push rod 2; 17. Separator plug; 18. Double-head probe; 19. Limit rod. DETAILED DESCRIPTION

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: During the friction welding process of pipe workpieces, the heat dissipation effect is indirectly affected by the structural characteristics of the pipe workpiece. However, the key issue is that there is a risk of loss of control during the thermoplastic deformation process, resulting in out-of-round problems. The following technical solutions are proposed:

[0031] Reference Figures 1 to 7 The modular friction welding head assembly with an adaptive pipe diameter structure in this embodiment includes a fixed clamping table 1, a dynamic clamping table 4, and a drive assembly 5. A Y-axis action group 3 is provided in the middle position of the fixed clamping table 1 and the dynamic clamping table 4, and an inner support column 11 is rotatably installed in the dynamic clamping table 4 through the drive assembly 5. An active oil sleeve 13 is provided on the outer wall position of the inner support column 11 corresponding to the middle position between the fixed clamping table 1 and the dynamic clamping table 4, and a passive oil sleeve 14 is provided on the outer wall position of one end of the inner support column 11 close to the dynamic clamping table 4;

[0032] The active oil sleeve 13 and the passive oil sleeve 14 are respectively provided with a push rod 2 16 and a push rod 1 15. An inner support plate 7 is provided at one end of the push rod 15. A pressure sensor 10 is installed at one end of the dynamic clamping table 4 corresponding to the passive oil sleeve 14. A pressure plate 9 is installed at the end of the transmission shaft of the pressure sensor 10.

[0033] The fixed clamping table 1 and the movable clamping table 4 are used to clamp the pipe. The setting direction of the Y-axis action group 3 is perpendicular to the length direction of the pipe. The setting direction of the inner support column 11 is parallel to the length direction of the pipe, and the center point of the inner support column 11 and the center point of the pipe are on the same horizontal axis.

[0034] Basic principle: Combination Figure 1A brief explanation of friction welding: the fixed clamping table 1 and the movable clamping table 4 both clamp the pipe with concentric clamps. The fixed clamping table 1 remains relatively unchanged but can drive the pipe to rotate at high speed. The pipe in the movable clamping table 4 does not rotate but can slide horizontally as a whole. As a result, the pipe in the fixed clamping table 1 rotates at high speed and contacts the pipe in the movable clamping table 4, thus completing friction welding. This part is the basic principle of friction welding;

[0035] The material targeted by the present invention is a pipe. For this purpose, an inner support column 11 is added to the dynamic clamping table 4. The inner support column 11 maintains a rotational connection with the dynamic clamping table 4 under the action of the drive assembly 5. The key is that the inner support plate 7 is provided at the position of the inner support column 11 corresponding to the contact between the two pipes. The drive assembly 5 is essentially a chain or gear transmission method.

[0036] It should also be noted that: Figure 3 As shown, an oil port sleeve 12 is provided at one end of the inner support column 11, and hydraulic oil is mainly injected into the inner support column 11 through the oil pump assembly 6. The hydraulic oil will enter the active oil sleeve 13, driving the push rod 2 16 to move outward, thereby driving the inner support piece 7 to move close to the inner wall of the pipe, ensuring that each inner support piece 7 moves synchronously and contacts the inner wall of the pipe at the same time to complete the internal support action of the pipe. The movement process of the inner support piece 7 is specifically coordinated with the inner diameter of the pipe, and the key is to rely on hydraulic power.

[0037] Example 2: The following supplementary explanation is provided for the action process of the inner support column:

[0038] The active oil sleeve 13 and the passive oil sleeve 14 are arranged in a circular array along the center point of the inner support column 11, and the lower end of the active oil sleeve 13 is connected to the interior of the inner support column 11. A separator plug 17 is installed in the inner support column 11, and the inner support column 11 forms multiple independent oil channels matching the interior of the active oil sleeve 13 through the separator plug 17;

[0039] The interior of the active oil sleeve 13 is provided with a pressure changing chamber and a pressure changing chamber respectively along the upper and lower directions through the push rod 2 16. The internal position of the passive oil sleeve 14 corresponding to the lower end of the push rod 15 is set as a pressure bearing chamber, and the upper end position of the push rod 15 corresponding to the pressure bearing chamber is provided with a spring member. An oil port is provided on the outer wall position of the passive oil sleeve 14 corresponding to the pressure bearing chamber. The pressure bearing chamber is not connected to the interior of the inner support column 11, and an oil return pipe 8 is connected between the pressure bearing chamber and the pressure changing chamber. The pressure-bearing sheet 9 is curved in the direction close to the inner support column 11. An oil pump assembly 6 is provided on the outside of the dynamic clamping table 4, and an oil port sleeve 12 corresponding to the oil pump assembly 6 is provided at one end of the inner support column 11;

[0040] When hydraulic oil is pumped into the inner support column 11, the hydraulic oil will definitely enter the active oil sleeve 13, and in essence, it will continue to enter the transformer chamber, thereby generating an outward thrust on the second push rod 16, thereby driving the inner support piece 7 on the second push rod 16 to move further outward;

[0041] The pressure-changing chamber is in a compressed state, and the pressure-changing chamber is connected to the pressure-bearing chamber through the return oil pipe 8. The hydraulic oil inside the pressure-changing chamber is reversely replenished into the pressure-bearing chamber, thereby also generating an outward thrust on the push rod 15 and prompting the push rod 15 to move outward. Both of them are essentially conventional oil cylinder transmission structures.

[0042] Solution description: This is explained in conjunction with Example 1. The specific operation process includes the following:

[0043] S1: Before working, first ensure that the two pipes are in full contact, and ensure that the position of the pipe contact surface just corresponds to the setting position of the inner support piece 7, which also needs to be referred to Figure 5 In the initial state, first, the plurality of inner supporting sheets 7 are maintained as Figure 5 The position shown in the figure is essentially that each inner support piece 7 is combined to form a perfect circle so that it will not move in the direction close to the inner support column 11. Therefore, during the calibration process, first, when the multiple inner support pieces 7 maintain the perfect circle, it is also necessary to reversely inject hydraulic oil through the oil port in the passive oil sleeve 14 to ensure that the stroke of the push rod 15 in each passive oil sleeve 14 is also maintained consistent. Secondly, it is also necessary to completely inject hydraulic oil into the inner support column 11.

[0044] S2: If Figure 3 As shown, multiple independent oil channels are also formed in the inner support column 11 through the separation plug 17. The purpose is to maintain the flow of hydraulic oil into the active oil sleeve 13. Based on S1, hydraulic oil is further injected into the inner support column 11 to expand each inner support plate 7 outward until it contacts the inner wall of the pipe. It should be noted that in this process, due to the continuous outward movement of the second push rod 16, the hydraulic oil in the pressure exchange chamber enters the pressure chamber, causing the first push rod 15 to move further outward, thereby pushing the pressure plate 9 at a certain position to move outward;

[0045] S3: Based on S2, it is necessary to limit the structural formation of the pressure plate 9 to avoid interference between the push rod 15 and the pressure plate 9 when the push rod 15 moves outward. To this end, it is also necessary to ensure that the top of the push rod 15 is spherical, so that when each inner support plate 7 is completely in contact with the inner wall of the pipe and the pipe itself has no obvious out-of-round problem, the displayed values ​​of each pressure sensor 10 should be consistent;

[0046] Furthermore, during the friction welding process, considering the structural characteristics of the pipe, the pipe will be out of round in the direction of the inner support column 11. In this regard, the inner support plate 7 mainly plays an internal supporting role with the inner diameter of the pipe. It should be noted that: on the one hand, the inner support plate 7 plays a stabilizing role to avoid the problem of out of round, and on the other hand, the inner support plate 7 can also move slightly in accordance with the change of the inner diameter of the pipe.

[0047] Specifically, it is necessary to ensure that the inner support column 11 and the pipe in the fixed clamping platform 1 rotate in the same direction and at the same speed, and to combine with Figure 4 To illustrate: If the entire pipe does not have a significant out-of-round problem, the displayed values ​​of each pressure sensor 10 are completely consistent, so that a ring-shaped simulated contour diagram is established using the displayed values ​​of multiple pressure sensors 10. When the inner support column 11 rotates synchronously, the oil pump assembly 6 still maintains the process of pumping hydraulic oil into the inner support column 11.

[0048] Therefore, when the pipe is out of round at a local position, the inner support piece 7 at the corresponding position will move further outward, thereby further squeezing the hydraulic chamber in the pressure chamber, squeezing part of the hydraulic oil into the passive oil sleeve 14, and causing the displayed value of the pressure sensor 10 at the corresponding position to change, and there is an obvious difference in the annular simulation contour diagram.

[0049] Example 3: This example proposes a process for detecting the outer circle vibration frequency based on Example 2:

[0050] A slide is installed in the Y-axis action group 3 along its length, and the slide is symmetrically arranged along the diameter direction of the pipe. A frequency detector 2 is installed on the slide. A probe part is arranged at the conduction end of the frequency detector 2. The probe part consists of a double-headed probe 18 and a limiting rod 19. The two ends of the double-headed probe 18 are spherical and contact the outer wall of the pipe through the Y-axis action group 3, and the middle section of the double-headed probe 18 is rotatably connected to the limiting rod 19.

[0051] Solution description: Supplementary explanation based on Example 2: The inner support piece 7 is mainly used to support the inner wall of the pipe. The problem of inner roundness of the pipe during friction welding is mainly reflected in the present invention. In order to detect the quality of friction welding in real time, reference is made to this. Figure 1 The Y-axis action axis 3 ensures that the two vibration frequency detectors 2 move along the diameter direction of the pipe;

[0052] by Figure 7For example, it is ensured that the spherical structures at both ends of the two double-headed probes 18 are in contact with the outer wall of the pipe. During the friction welding process, one of the pipes keeps rotating while the position of the other pipe remains unchanged. Then, during the friction welding rotation process, the outer wall of the pipe keeps in contact with one end of the double-headed probe 18. A certain vibration frequency is generated due to the contact between the two. The vibration frequency can be obtained in real time by the vibration frequency detector 2. If the two pipes are fully melted during the friction contact process, the friction resistance between the two is relatively small, so that the vibration frequency generated is relatively stable and small; on the contrary, when the two pipes are not completely melted, the friction resistance between the two is relatively large.

[0053] The key is that there may be an internal / external misalignment problem in the fit. Because one of the tubes only maintains rotation but its position remains unchanged, one end of the double-headed probe 18 at that position remains in contact. However, the sphere at the other end of the double-headed probe 18 may be misaligned due to the internal / external misalignment problem. Specifically, the middle section of the double-headed probe 18 maintains a rotational connection with the limiting rod 19, and the rotation speed of the double-headed probe 18 on the limiting rod 19 is only in the horizontal direction of the corresponding tube center point. This is explained with a top view of the double-headed probe 18:

[0054] If there is an internal out-of-round problem, the double-headed probe 18 may rotate counterclockwise, so that the degree of contact between the double-headed probe 18 and the outer wall of the pipe is reduced, and the vibration frequency generated by it tends to decrease significantly, or even decrease to 0. On the contrary, if there is an external out-of-round problem, although the double-headed probe 18 has a tendency to rotate clockwise, it does not have the ability to rotate clockwise. However, the degree of contact between the double-headed probe 18 and the outer wall of the pipe will also be reduced, so that the vibration frequency detected by the vibration frequency detector 2 tends to decrease. Based on the second embodiment, the out-of-round problem is further fed back through the vibration frequency detection process in combination with the annular simulation contour diagram, and the specific parameters are not further limited in the present invention.

[0055] In summary: For the friction welding process of pipe structures, the internal support method is mainly used to avoid the problem of out-of-roundness during pipe welding. The essence is to use hydraulic drive to drive multiple inner support plates to expand outward at the same time. The inner walls of the two contacting pipes play an internal support role. The key is to convert the internal stress of the pipe welding on the inner support plates into liquid pressure. Secondly, the passive oil sleeve and pressure sensor are combined to form an indirect sensing structure. The essence is to form a ring-shaped simulation contour map of the pipe welding with the displayed values ​​​​in multiple pressure sensors. On the one hand, it is used to match the inner diameter of the pipe. On the other hand, the inner circle of the pipe is detected and maintained through indirect sensing, and the outer circle of the pipe is sensed in conjunction with the vibration frequency detection method, which serves as an enhanced part of the inner circle detection process.

[0056] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A modular friction welding head assembly with an adaptive pipe diameter structure, comprising a fixed clamping table (1), a movable clamping table (4), and a drive component (5), characterized in that: A Y-axis action group (3) is provided at the middle position of the fixed clamping platform (1) and the movable clamping platform (4), and an inner support column (11) is rotatably installed in the movable clamping platform (4) through a driving component (5), and an active oil sleeve (13) is provided on the outer wall position of the inner support column (11) corresponding to the middle position of the fixed clamping platform (1) and the movable clamping platform (4), and a passive oil sleeve (14) is provided on the outer wall position of one end of the inner support column (11) close to the movable clamping platform (4); The active oil sleeve (13) and the passive oil sleeve (14) are respectively provided with a second push rod (16) and a first push rod (15), an inner support plate (7) is provided at one end of the push rod (15), a pressure sensor (10) is installed at one end of the dynamic clamping table (4) corresponding to the passive oil sleeve (14), and a pressure plate (9) is installed at the end of the transmission shaft of the pressure sensor (10); The fixed clamping platform (1) and the movable clamping platform (4) are used to clamp the pipe, the setting direction of the Y-axis action group (3) is perpendicular to the length direction of the pipe, the setting direction of the inner support column (11) is parallel to the length direction of the pipe, and the center point of the inner support column (11) and the center point of the pipe are on the same horizontal axis; A slide is slidably mounted in the Y-axis action group (3) along its length direction. The slide is symmetrically arranged along the diameter direction of the pipe. A vibration frequency detector (2) is mounted on the slide. A probe is arranged at the conducting end of the vibration frequency detector (2).

2. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 1, characterized in that: The probe component is composed of a double-headed probe (18) and a limiting rod (19). The two ends of the double-headed probe (18) are spherical and contact the outer wall of the pipe through the Y-axis action group (3), and the middle section of the double-headed probe (18) is rotatably connected to the limiting rod (19).

3. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 1, characterized in that: The active oil sleeve (13) and the passive oil sleeve (14) are arranged in a circular array along the center point of the inner support column (11), and the lower end of the active oil sleeve (13) is connected to the interior of the inner support column (11).

4. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 3, characterized in that: A separation plug (17) is installed in the inner support column (11), and the inner support column (11) forms a plurality of independent oil passages matching the interior of the active oil sleeve (13) through the separation plug (17).

5. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 4, characterized in that: The active oil sleeve (13) is provided with a pressure changing chamber and a pressure changing chamber in the upper and lower directions respectively through the second push rod (16), and the passive oil sleeve (14) is provided with a pressure bearing chamber at an internal position corresponding to the lower end of the first push rod (15).

6. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 5, characterized in that: The push rod (15) is provided with a spring member at the upper end position corresponding to the pressure chamber, and the passive oil sleeve (14) is provided with an oil port at the outer wall position corresponding to the pressure chamber. The pressure chamber is not connected to the interior of the inner support column (11), and an oil return pipe (8) is connected between the pressure chamber and the pressure changing chamber.

7. The modular friction welding head assembly with an adaptive pipe diameter structure according to claim 1, characterized in that: The pressure plate (9) is in a curved arch shape in a direction close to the inner support column (11); an oil pump assembly (6) is provided on the outside of the dynamic clamping table (4); and an oil port sleeve (12) corresponding to the oil pump assembly (6) is provided at one end of the inner support column (11).

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