A welding numerically controlled machine tool

Abstract

The present application relates to the technical field of welding, and discloses a welding numerical control machine tool, which comprises a machine tool platform and further comprises: a workpiece clamping assembly, the workpiece clamping assembly comprising two butt-jointable sleeves and three-point inner support actuators arranged on the two sleeves and capable of being adjusted to be opened or closed, the two groups of three-point inner support actuators being arranged in axial misalignment with each other; a welding execution component, the welding execution component being used for welding butt joints of two thin-walled pipes; and a gas pressure differential assembly, the gas pressure differential assembly comprising a jet nozzle arranged at a butt joint area of the two thin-walled pipes and two backflow cavities located at two sides of the jet nozzle. The present application converts the butt joint step of the thin-walled pipes into a quantifiable steady-state pressure differential signal through a closed-loop detection path of "joint-spraying jet flow-bilateral recycling-differential pressure determination", and modulates the signal into a periodic quantity in rotation, so that online identification of the interference amount of the inner support is realized, and the effect of real-time calibration of the roundness without an additional quantity instrument is achieved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding CNC machine tool. Background Technology

[0002] Numerical control welding machine tools are advanced manufacturing equipment that automate and refine the welding process through computer numerical control (CNC) systems. They combine welding technology, numerical control technology, and robotics technology, and are widely used in industrial settings where welding quality and consistency requirements are high.

[0003] Currently, in the butt welding process of thin-walled metal tubes, during the auxiliary fixing process, it is necessary to ensure that the axes of the two metal tubes coincide and their circular end faces are concentric in order to ensure the welding quality.

[0004] To address this, Chinese Patent Publication No. CN118268809B discloses a welding auxiliary device for precision mechanical parts processing. This device uses two sets of externally expanding centering clamping assemblies to center-clamp thin-walled tubes, ensuring the axial position of the tubes. Then, by using the cooperation of a limiting cylinder and a limiting shaft, the axial positions of the two sets of externally expanding centering clamping assemblies are limited, thereby ensuring that the axes of the two externally expanding centering clamping assemblies coincide, and thus ensuring that the axes of the two thin-walled tubes coincide, thereby improving the welding quality.

[0005] This device is designed for auxiliary positioning of workpieces before welding. However, this method of internal support fixation makes it difficult to control the force of the internal support, and it is easy to cause the internal support force to be too large. For high-strength thin tubes, excessive internal support force will only make them more stable. However, for thin tubes with weak strength, excessive internal support force will cause internal support deformation, resulting in them becoming out of round.

[0006] Taking its publicly available case as an example, when the internal support force is too large, the cross-section of the thin tube will change from a circle to a triangular shape. Similarly, if it is a four-point internal support, it will change to a square shape. This means that the thin tubes after welding may be able to complete the connection and welding because the internal support forces of the two tubes are the same. However, the welded cross-section is no longer circular. Therefore, when the internal support force is removed after welding, the deformation of the thin tube itself will apply internal stress to the weld position, which will create hidden dangers for subsequent welds. Summary of the Invention

[0007] The purpose of this invention is to provide a welding CNC machine tool to solve at least one technical problem existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a welding CNC machine tool, comprising a machine tool platform, and further comprising:

[0009] The workpiece clamping assembly includes two sleeves that can be mated, and three-point internal support actuators disposed on the two sleeves and adjustable for opening or closing. The two sets of three-point internal support actuators are arranged offset from each other in the axial direction.

[0010] A welding actuator for welding the butt joint of two thin-walled tubes;

[0011] The differential pressure assembly includes a jet nozzle disposed in the joint area of ​​two thin-walled pipes and two return chambers located on both sides thereon. The jet nozzle is used to eject airflow at the joint position, and the two return chambers respectively take back static pressure from both sides of the joint and obtain pressure components on the left and right sides.

[0012] Optionally, the pneumatic differential assembly further includes a fixed frame fixed to the top surface of the machine tool platform. The outer wall of the fixed frame is fixed with a pressure equalization chamber, and the pressure equalization chamber is connected to an external air supply device. The jet nozzle is connected and fixed to the outer wall of the pressure equalization chamber. A differential pressure device is also installed on the outer wall of the fixed frame. Both of the return chambers are connected to the differential pressure device through a connecting pipe.

[0013] Optionally, the workpiece clamping assembly further includes two sliding shaft seats mounted on the top of the machine tool platform and adjustable to be close to or far from each other. The two sleeves are respectively rotatably mounted on the axes of the two sliding shaft seats and are both driven by an external structure.

[0014] The three-point internal support actuator includes a fixed ring fixed to the end of the sleeve, and an adjusting ring installed on the outer wall of the sleeve and adjustable by sliding. Three sets of two connecting rods are rotatably connected between the fixed ring and the adjusting ring, and an internal support is installed at the hinge point between the two connecting rods.

[0015] Optionally, an inner shaft is rotatably mounted on the inner wall of both sleeves, and the opposite ends of the two inner shafts can be slidably inserted. A servo motor for driving the inner shaft to rotate is also mounted on one of the sliding shaft seats. A thread is opened on part of the outer wall of the inner shaft. A threaded wedge that meshes with the thread is fixed on the inner wall of the adjusting ring. A long groove is opened on the outer wall of the sleeve for the threaded wedge to pass through and slide and limit.

[0016] Optionally, sleeves are fixed to the outer walls of the opposite sides of the two sliding shaft seats, piston rings are slidably installed on the inner walls of the two sleeves, and the two ends of the inner shaft pass through the sleeves and piston rings respectively. A cam groove with the ends connected is opened on the outer wall of the inner shaft. A sliding pin is fixed to the inner ring wall of the sleeve and slidably installed in the cam groove. The sealing space in the sleeve is unidirectionally connected to the pressure equalization chamber through a one-way air pipe, and a one-way air inlet is also opened on the outer wall of the sleeve.

[0017] Optionally, one end of each of the two sleeves is provided with a slidable spline structure, and the outer wall of one of the sleeves is also fixed with a transmission gear, which meshes with an external gear drive component for transmission.

[0018] Optionally, the top surface of the machine tool platform is provided with a transverse groove, and both of the sliding shaft seats are slidably installed in the transverse groove. A guide rod is fixed in the transverse groove, passing through the two sliding shaft seats and slidably connected to them at the point of penetration. A bidirectional screw driven by a servo motor is also rotatably installed in the transverse groove. The bidirectional screw passes through the two sliding shaft seats and is threadedly connected to the point of penetration of the two sliding shaft seats.

[0019] Optionally, a reserved length is provided at the contact point between the inner support and the sliding shaft seat and at the port position of the sliding shaft seat.

[0020] Optionally, the welding execution component is at least one of laser welding, argon arc welding, or electric arc welding.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] I. This invention uses a closed-loop detection path of "joint jetting - double-sided recovery - differential pressure judgment" to convert the butt joint step of thin-walled tubes into a quantifiable steady-state differential pressure signal, which is modulated into a periodic quantity during rotation. This enables online identification of the internal support interference, achieving real-time calibration of roundness without additional measuring instruments, eliminating out-of-roundness caused by "over-support" and stress concentration after welding, thereby significantly improving the one-time welding quality of ultra-thin-walled precision tubes.

[0023] Second, this invention arranges multiple sets of synchronously expandable "connecting rod-wedge" type three-point internal support actuators on the same sleeve, and with the help of the internal shaft thread-wedge pair and spline plug-in structure, the servo motor can accurately adjust the support force at each point in the static state, and drive the workpiece to rotate at a uniform speed in the welding stage, thus achieving the effect of uniform support and tension along the entire length of the thin-walled tube, no local indentation, and arbitrary adjustment of the weld position.

[0024] Third, this invention utilizes the rotational motion of the inner shaft itself to directly convert mechanical energy into a continuous pulsating supply of protective gas through the cam groove-piston ring mechanism. Gas is alternately injected into the pressure equalization chamber from both sides, so that the jet nozzle maintains laminar flow protection throughout the welding process. This eliminates the need for an independent air compressor and flow valve group, achieving the effects of simplifying the air path, reducing energy consumption, and simultaneously realizing self-sufficiency of the gas source for weld back forming protection and differential pressure detection. Attached Figure Description

[0025] Figure 1 This is the front view of the present invention;

[0026] Figure 2 This is a partial perspective view of the machine tool platform and its structure according to the present invention;

[0027] Figure 3 This is a front sectional view of the workpiece clamping assembly of the present invention;

[0028] Figure 4 For the present invention Figure 3 A sectional perspective view and a magnified partial view;

[0029] Figure 5 This is a three-dimensional structural schematic diagram of the workpiece clamping assembly of the present invention;

[0030] Figure 6 This is a partially enlarged perspective view of the workpiece clamping assembly of the present invention;

[0031] Figure 7 This is a top sectional view of the workpiece clamping assembly of the present invention;

[0032] Figure 8 This is an exploded perspective view of the inner shaft, sleeve, and piston ring of the present invention;

[0033] Figure 9 This is a cross-sectional schematic diagram of the pneumatic differential assembly of the present invention;

[0034] Figure 10 This is a schematic diagram of the thin-walled tube of the present invention when the internal support force is too large;

[0035] Figure 11 This is an axial view of the two thin-walled tubes of the present invention when the internal support force is too large.

[0036] In the diagram: 1. Machine tool platform; 2. Welding actuator; 3. Thin-walled tube; 4. Sliding shaft seat; 5. Inner shaft; 6. Sleeve; 7. Fixed ring; 8. Adjusting ring; 9. Connecting rod; 10. Inner support; 11. Sleeve; 12. Piston ring; 13. Threaded wedge; 14. Fixing frame; 15. Pressure equalizing chamber; 16. Jet nozzle; 17. Return chamber; 18. Differential pressure device; 19. One-way air pipe; 20. Cam groove; 21. Sliding pin. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 11 The present invention provides a technical solution: a welding CNC machine tool, including a machine tool platform 1, and further comprising:

[0039] The workpiece clamping assembly includes two sleeves 6 that can be mated, and three-point internal support actuators that are set on the two sleeves 6 and can be opened or closed for adjustment. The two sets of three-point internal support actuators are arranged to be staggered relative to each other in the axial direction.

[0040] Welding execution component 2 is used for butt welding of two thin-walled tubes 3, and welding execution component 2 is at least one of laser welding, argon arc welding or electric arc welding;

[0041] The air pressure differential assembly includes a jet nozzle 16 disposed in the docking area of ​​the two thin-walled tubes 3 and two return chambers 17 located on both sides thereon. The jet nozzle 16 is used to jet out airflow at the docking seam position, and the two return chambers 17 respectively take the return static pressure from both sides of the docking seam and obtain the pressure components on the left and right sides.

[0042] When using this welding CNC machine tool, the thin-walled tube 3 to be welded is first fixed by the workpiece clamping assembly. This involves inserting the thin-walled tube 3 into the sleeve 6 and using a three-point internal support actuator to radially tighten the inner wall of the thin-walled tube 3 from the inside, achieving precise centering and clamping. Then, the two sections of the thin-walled tube 3 are axially aligned to ensure a tight fit. Secondly, for thin tubes with lower strength, to avoid excessive internal support force from the three-point internal support actuator (which could also be four-point or five-point, but three-point is used in this case) causing the thin-walled tube 3 to become out of round, it is still necessary to inspect and calibrate it after internal support fixation to ensure the subsequent welding quality. The specific method is as follows:

[0043] Activating the differential pressure assembly, the jet nozzle 16 sprays protective gas towards the joint, directing the airflow to the joint. The airflow is geometrically divided into three paths—through the joint (middle path) + along the two side pipe walls (left / right paths), as shown below. Figure 9 As shown, when there are steps (staggered) on both side walls, the flow resistance of the flow along the walls on both sides is different. Therefore, a static pressure difference ΔP is generated between the left and right return cavities 17. When the inner support actuator (or workpiece) is rotated, ΔP will change periodically, and its amplitude reflects the "over-support strength". Figure 10 and Figure 11 This indicates the degree of deformation of the thin-walled tube 3 when subjected to excessive internal support force. Figure 11 This is the viewing angle of the two thin-walled tubes 3 along the axial direction. At this point, it is necessary to adjust the internal support force of the three-point internal support actuator until the steps on both sides of the wall disappear, thus completing the adjustment process of the internal support force.

[0044] Finally, the welding execution component 2 performs precision welding on the butt joint along a preset trajectory to complete the connection of the thin-walled tube 3.

[0045] In this way, the "staggered steps" can be converted into a robust differential pressure signal through "joint jetting - double-sided recovery - differential pressure judgment", and then "modulated" into a periodic quantity that is easy to lock into phase by rotating the inner support component, thereby accurately adjusting the inner support degree of the three-point inner support actuator.

[0046] In one preferred embodiment, an implementation of a pneumatic differential assembly is provided;

[0047] The pneumatic differential assembly also includes a fixed frame 14 fixed on the top surface of the machine tool platform 1. A pressure equalization chamber 15 is fixed on the outer wall of the fixed frame 14 and the pressure equalization chamber 15 is connected to an external air supply device. A jet nozzle 16 is fixed on the outer wall of the pressure equalization chamber 15. A differential pressure device 18 is also installed on the outer wall of the fixed frame 14. Both return chambers 17 are connected to the differential pressure device 18 through connecting pipes.

[0048] For details, please refer to [link / reference]. Figure 7 and Figure 9 The external air supply device first injects air into the pressure equalization chamber 15, and after equalization in the pressure equalization chamber 15, it sprays out from the jet nozzle 16. The wall-adhering flow on both sides flows back to the two return chambers 17 respectively. The pressure difference in the two return chambers 17 is monitored by the differential pressure device 18, and then the pressure difference is determined.

[0049] It is worth mentioning that the interior of the return cavity 17 can be set as a small expansion cavity. The purpose is to reduce the velocity of the wall jet, leaving only static pressure, and then P can be measured.

[0050] In one preferred embodiment, an implementation of a workpiece clamping assembly is provided;

[0051] The workpiece clamping assembly also includes two sliding bearings 4 mounted on the top of the machine tool platform 1 and adjustable to be close to or far from each other. Two sleeves 6 are rotatably mounted on the axes of the two sliding bearings 4 and are driven by an external structure.

[0052] The three-point internal support actuator includes a fixed ring 7 fixed to the end of the sleeve 6, and an adjusting ring 8 installed on the outer wall of the sleeve 6 and adjustable by sliding. Three sets of two connecting rods 9 are rotatably connected between the fixed ring 7 and the adjusting ring 8, and an internal support member 10 is installed at the hinge point between the two connecting rods 9.

[0053] For details, please refer to [link / reference]. Figure 3 - Figure 6 After the thin-walled tube 3 is fitted onto the sleeve 6, the external structure moves and adjusts the adjusting ring 8 to move it closer to the fixed ring 7. The connecting rod 9 between them causes the inner support 10 to move centrifugally, thereby completing the inner support fixation of the thin-walled tube 3.

[0054] Then, the two sliding bearings 4 are driven to approach each other by the external structure so that the two thin-walled tubes 3 are connected to each other. A certain gap is reserved before they are fully in contact to facilitate the subsequent inspection process. Then, the position of the adjusting ring 8 is adjusted according to the pressure difference detection of the air pressure differential component until the internal support force of the inner support member 10 on the thin-walled tube 3 makes the cross section of the thin-walled tube 3 in a circular state and then stops.

[0055] Finally, the final welding is completed after the two thin-walled tubes 3 are fully butted together.

[0056] It is worth mentioning that the three-point internal support actuators can also be designed side by side on the sleeve 6, with two or three sets, depending on the length of the thin-walled tube 3. Moreover, the three-point internal support actuators on the same sleeve 6 are designed synchronously, which ensures that the three-point internal support actuators between the two sleeves 6 are distributed in a cross pattern.

[0057] In one preferred embodiment, an implementation method for adjusting the position of the regulating ring 8 is provided;

[0058] The inner walls of both sleeves 6 are rotatably mounted with inner shafts 5, and the opposite ends of the two inner shafts 5 can be slidably inserted. A servo motor for driving the rotation of the inner shaft 5 is also mounted on one of the sliding shaft seats 4. A thread is opened on part of the outer wall of the inner shaft 5. A threaded wedge 13 that meshes with the thread is fixed on the inner wall of the adjusting ring 8. A long groove is opened on the outer wall of the sleeve 6 for the threaded wedge 13 to pass through and slide and limit.

[0059] For details, please refer to [link / reference]. Figure 4 and Figure 6 When the two sliding bearing seats 4 approach each other, the opposite ends of the two sleeves 6 and the two inner shafts 5 will slide and insert into each other, specifically by using spline insertion, so that the sleeves 6 and inner shafts 5 after docking can form a whole shaft.

[0060] Secondly, see Figure 8 The outer wall of the inner shaft 5 is provided with an annular groove, while the inner wall of the sleeve 6 is fixed with an inner ring embedded in the annular groove. This design allows the inner shaft 5 and the sleeve 6 to move synchronously in the axial direction, while also being able to rotate relative to each other.

[0061] Therefore, when the servo motor drives the inner shaft 5 to rotate, the sleeve 6 remains stationary due to the stop of the external drive structure. At this time, through the meshing action between the thread on the outer wall of the inner shaft 5 and the threaded wedge 13, the adjusting ring 8 can be driven to make axial adjustment along the sleeve 6, thereby achieving the purpose of adjusting the degree of inner support of the inner support 10.

[0062] When the inner shaft 5 and the sleeve 6 rotate simultaneously under the drive of the servo motor and the external drive assembly, the inner support 10 and the thin-walled tube 3 can rotate, while maintaining the inner support function, so as to cooperate with the pneumatic differential assembly to complete the detection.

[0063] In one preferred embodiment, a method for continuously injecting gas into the pressure equalization chamber 15 is provided;

[0064] Both sliding shaft seats 4 have sleeves 11 fixed on their opposite outer walls. Piston rings 12 are slidably installed on the inner walls of both sleeves 11. Both ends of the inner shaft 5 pass through the sleeves 11 and the piston rings 12 respectively. The outer wall of the inner shaft 5 has a cam groove 20 that connects the two ends. The inner ring wall of the sleeve 11 has a sliding pin 21 that is slidably installed in the cam groove 20. The sealing space inside the sleeve 11 is unidirectionally connected to the pressure equalization chamber 15 through a one-way air pipe 19. The outer wall of the sleeve 11 also has a one-way air inlet.

[0065] For details, please refer to [link / reference]. Figure 7 and Figure 8 During the process of the inner shaft 5 and the sleeve 6 being driven to rotate simultaneously, causing the thin-walled tube 3 to rotate, the rotation of the inner shaft 5 will also cause the piston ring 12 to slide back and forth in the sleeve 11 through the sliding fit between the cam groove 20 on it and the sliding pin 21 on the inner wall of the piston ring 12, thereby drawing gas into the internal sealed space through the one-way air inlet, and then injecting it into the pressure equalization chamber 15 through the one-way air pipe 19.

[0066] Among them, the piston rings 12 inside the two sleeves 11 on both sides are designed to face each other, so that the sealed space inside the two sleeves 11 alternately injects air into the pressure equalization chamber 15, thereby ensuring continuous air injection in the pressure equalization chamber 15, and thus enabling the jet nozzle 16 to continuously spray air.

[0067] In one preferred embodiment, the two sleeves 6 are provided with a slidable spline structure at their opposite ends, and a transmission gear is fixed to the outer wall of one of the sleeves 6, which meshes with an external gear drive component for transmission.

[0068] For details, please refer to [link / reference]. Figure 3 and Figure 4 The two sleeves 6 are also connected by splines. When the transmission gear is driven by an external gear drive (the motor shaft fixed gear and meshes with the transmission gear), the two sleeves 6 can be driven to rotate together.

[0069] In one preferred embodiment, an implementation method is provided for controlling the two sliding bearings 4 to be adjusted relative to or away from each other;

[0070] The top surface of the machine tool platform 1 is provided with a transverse groove, and two sliding shaft seats 4 are slidably installed in the transverse groove. A guide rod is fixed in the transverse groove, passing through the two sliding shaft seats 4 and slidably connected to them at the point of penetration. A bidirectional screw driven by a servo motor is also rotatably installed in the transverse groove. The bidirectional screw passes through the two sliding shaft seats 4 and is threadedly connected to the point of penetration of the two sliding shaft seats 4.

[0071] In one preferred embodiment, the contact point between the inner support 10 and the sliding shaft seat 4 is reserved with a length relative to the port position of the sliding shaft seat 4.

[0072] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding CNC machine tool, comprising a machine tool platform (1), characterized in that, Also includes: The workpiece clamping assembly includes two sleeves (6) that can be mated, and a three-point internal support actuator disposed on the two sleeves (6) and adjustable for opening or closing. The two sets of the three-point internal support actuators are arranged offset from each other in the axial direction. Welding execution component (2), which is used for welding the butt joint of two thin-walled tubes (3); The differential pressure assembly includes a jet nozzle (16) disposed in the docking area of ​​two thin-walled tubes (3) and two return chambers (17) located on both sides thereon. The jet nozzle (16) is used to jet out airflow at the docking seam. The two return chambers (17) respectively take the return static pressure from both sides of the docking seam and obtain the pressure components on the left and right sides. The pneumatic differential assembly also includes a fixed frame (14) fixed on the top surface of the machine tool platform (1). The outer wall of the fixed frame (14) is fixed with a pressure equalization chamber (15), and the pressure equalization chamber (15) is connected to an external air supply device. The jet nozzle (16) is connected and fixed on the outer wall of the pressure equalization chamber (15). The outer wall of the fixed frame (14) is also equipped with a differential pressure device (18). Both return chambers (17) are connected to the differential pressure device (18) through a connecting pipe. The workpiece clamping assembly also includes two sliding bearings (4) mounted on the top of the machine tool platform (1) and adjustable to be close to or far from each other. The two sleeves (6) are respectively rotatably mounted on the axis of the two sliding bearings (4) and are both driven by an external structure. The three-point internal support actuator includes a fixed ring (7) fixed to the end of the sleeve (6) and an adjusting ring (8) installed on the outer wall of the sleeve (6) and adjustable. Three sets of two connecting rods (9) are rotatably connected between the fixed ring (7) and the adjusting ring (8), and an internal support member (10) is installed at the hinge point between the two connecting rods (9). The inner walls of both sleeves (6) are rotatably mounted with inner shafts (5), and the opposite ends of the two inner shafts (5) can be slidably inserted. A servo motor for driving the inner shaft (5) to rotate is also mounted on one of the sliding shaft seats (4). A thread is opened on part of the outer wall of the inner shaft (5). A threaded wedge (13) that meshes with the thread is fixed on the inner wall of the adjusting ring (8). A long groove is opened on the outer wall of the sleeve (6) for the threaded wedge (13) to pass through and slide and limit. Both of the sliding shaft seats (4) have sleeves (11) fixed on their opposite outer walls. Both of the sleeves (11) have piston rings (12) slidably installed on their inner walls. The two ends of the inner shaft (5) pass through the sleeves (11) and the piston rings (12) respectively. The outer wall of the inner shaft (5) has a cam groove (20) connected end to end. The inner ring wall of the sleeve (11) has a sliding pin (21) slidably installed in the cam groove (20). The sealing space in the sleeve (11) is unidirectionally connected to the pressure equalization chamber (15) through a one-way air pipe (19). The outer wall of the sleeve (11) also has a one-way air inlet.

2. The welding CNC machine tool according to claim 1, characterized in that: The two sleeves (6) are provided with a spline structure that can be slidably inserted at one end, and a transmission gear is fixed on the outer wall of one of the sleeves (6), which meshes with an external gear drive.

3. The welding CNC machine tool according to claim 1, characterized in that: The top surface of the machine tool platform (1) is provided with a transverse groove, and the two sliding shaft seats (4) are slidably installed in the transverse groove. A guide rod is fixed in the transverse groove, passing through the two sliding shaft seats (4) and slidably connected to them at the point of penetration. A bidirectional screw driven by a servo motor is also rotatably installed in the transverse groove. The bidirectional screw passes through the two sliding shaft seats (4) and is threadedly connected to the point of penetration of the two sliding shaft seats (4).

4. The welding CNC machine tool according to claim 1, characterized in that: The contact point between the inner support (10) and the sliding shaft (4) has a reserved length relative to the port position of the sliding shaft (4).

5. The welding CNC machine tool according to any one of claims 1-4, characterized in that: The welding execution component (2) is at least one of laser welding, argon arc welding or electric arc welding.

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