Small-diameter threaded hole inner wall all-position additive repairing system and method

Abstract

The invention relates to the technical field of thread welding repair, and provides a small-diameter threaded hole inner wall all-position additive repair system and method.The system comprises a TIG welding gun, a water cooling water supply device, a shielding gas supply device, a TIG additive power source, a control device and a man-machine interaction device; the TIG welding gun comprises a welding gun head, a radial sliding table, a rotary driving device and an axial driving device. The water cooling water supply device is connected with the welding gun head; the shielding gas supply device is connected with the welding gun head; the TIG additive power supply is electrically connected with the welding gun head, the water cooling water supply device and the protective gas supply device; the control device is in signal connection with the radial sliding table, the rotary driving device, the axial driving device, the water cooling water supply device and the TIG additive power source. And the man-machine interaction device is in signal connection with the control device. According to the device, all-position additive repairing operation on the inner wall of the small-diameter threaded hole can be achieved, and welding parameters can be controlled in real time through the man-machine interaction device.

Description

Technical Field

[0001] The present invention relates to the technical field of threaded welding repair, and in particular to a system and method for all-position additive repair of the inner wall of a small-diameter threaded hole. Background Art

[0002] TIG welding is a welding method that uses an infusible tungsten electrode to generate an arc under the protection of an inert gas to heat and melt the workpiece. It has high welding quality. The inert gas can effectively protect the arc and the molten pool to prevent oxidation and the mixing of impurities. It has high welding efficiency and can achieve high-speed and continuous welding. It has high welding flexibility and can adapt to welding of different thicknesses, different positions, and different forms. Therefore, TIG welding is widely used in aerospace, nuclear energy, automobile manufacturing, shipbuilding, chemical industry, and medical equipment industries.

[0003] At present, the rail transit equipment industry faces the problem of repairing damaged threaded holes, and there are difficulties such as a large number of damaged parts and diverse structures of damaged threaded holes. Threaded hole repair technology is a repair technology that uses welding to build up and re-tap damaged threaded holes. It can not only ensure the repair quality, but also save a lot of manufacturing costs. It is one of the key technologies in the field of threaded hole repair.

[0004] Traditional repair welding technology mostly uses manually operated welding equipment, which is relatively convenient for repairing large-diameter threaded holes. However, when dealing with small-diameter threads, it greatly increases the difficulty of implementing traditional repair welding technology and is limited by welding equipment. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the present invention provides a system and method for additive repair of the inner wall of a small-diameter threaded hole in all positions, which can realize additive repair operations on the inner wall of a small-diameter threaded hole in all positions, has complete cooling and gas protection functions, and can control welding parameters in real time through a human-computer interaction device.

[0006] The present invention provides a full-position additive repair system for the inner wall of a small-diameter threaded hole, comprising: A TIG welding gun, the TIG welding gun comprising a welding gun head, a radial sliding table, a rotary drive device and an axial drive device, the welding gun head is connected to the radial sliding table, the radial sliding table is connected to the rotary drive device, and the rotary drive device is connected to the axial drive device; A water cooling water supply device, the water cooling water supply device is connected to the welding gun head, and the water cooling water supply device is suitable for providing cooling water to the welding gun head; A shielding gas supply device, the shielding gas supply device is connected to the welding gun head, and the shielding gas supply device is suitable for providing shielding gas to the welding gun head; A TIG additive power source, the TIG additive power source is electrically connected to the welding gun head, the water cooling water supply device, and the shielding gas supply device; A control device, wherein the control device is respectively connected to the radial sliding table, the rotary drive device, the axial drive device, the water cooling water supply device, the water cooling water supply device and the TIG additive power supply signal; A human-machine interaction device is connected to the control device by signals.

[0007] According to a full-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the control device includes a processor module, a rotation drive module, a radial drive module, an axial drive module and a high-frequency arc ignition module, the processor module is respectively connected to the rotation drive module, the radial drive module, the axial drive module and the high-frequency arc ignition module by signal, and the processor module sends a control signal to the rotation drive device through the rotation drive module according to a received control instruction or a preset program; Alternatively, a control signal is sent to the radial sliding stage through the radial driving module; Alternatively, a control signal is sent to the axial drive device through the axial drive module; Alternatively, a control signal is sent to the TIG additive power source through the high-frequency arc starting module.

[0008] According to a full-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the full-position additive repair system for the inner wall of a small-diameter threaded hole also includes a wire feeding device, the wire feeding device and the welding gun head are arranged at two opposite ends of the rotating drive device, and the control device includes a wire feeding drive module, and the wire feeding drive module is suitable for controlling the wire feeding device to feed wire to the welding gun head.

[0009] According to a full-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the control device also includes a digital communication module, and the processor module is connected to the human-computer interaction device signal through the digital communication module to set and display in real time the repair parameters of the TIG welding gun during the repair process.

[0010] According to a full-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the control device also includes a repair current sampling module and an additive voltage sampling module. The repair current sampling module and the additive voltage sampling module are connected to the TIG additive power supply to monitor the arc starting parameters and repair parameters of the TIG welding gun in real time during the repair process.

[0011] According to a full-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the radial sliding table and the axial drive device respectively include one or more limit switches, and the limit switches are respectively installed at both ends of the maximum travel range of the radial sliding table and the axial drive device. The control device includes an emergency stop protection module, and the limit switch is connected to the processor module through the emergency stop protection module.

[0012] According to the all-position additive repair system for the inner wall of a small-diameter threaded hole provided by the present invention, the processor module is respectively connected to the water cooling water supply device and the protective gas supply device through relays.

[0013] The present invention also provides a method for all-position additive repair of the inner wall of a small-diameter threaded hole, comprising the following steps: S1: Connect the positive terminal of the additive power supply to the TIG welding gun, and the negative terminal to the workpiece of the threaded hole to be repaired. Use the positioning tool to extend the TIG welding gun to the designated repair position of the threaded hole to be repaired. Adjust the position of the TIG welding gun so that the tungsten electrode of the TIG welding gun coincides with the designated repair position, and fix the TIG welding gun with a clamp; S2: Select appropriate additive process parameters through the human-machine interaction device, send a start signal, control the water cooling water supply device to supply water and the air protection air supply device to supply air; S3: The control device starts the high-frequency arc striking module and the TIG additive power supply to achieve high-frequency and high-voltage arc striking. After the arc striking is successful, the high-frequency arc striking module is turned off to enter the repair current rising stage; S4: After the repair current rises to a stable stage, the repair operation begins. The control device starts the wire feeding drive module and the wire feeding device to drive the welding wire to be transported to the repair area at a set speed. At the same time, the control device also starts the rotation drive module and the rotation drive device, the axial drive module and the axial drive device, respectively, to drive the welding gun head to rotate and move axially at the set speed at the same time. S5: judging whether the tungsten electrode has traveled the preset axial distance according to the speed of axial movement; after judging that the tungsten electrode has traveled the preset axial distance, the rotary drive device, the axial drive device and the wire feeding device are turned off; the repair current enters the descending stage until the arc is extinguished; S6: Then determine whether the inner diameter of the small threaded hole is increased to the required hole diameter; if it is not increased to the required hole diameter, execute S7 to S9; if it is increased to the required hole diameter, execute S10; S7: The control device starts the radial drive module and the radial sliding table, drives the welding gun head to move radially for a certain distance at a set speed, and closes the radial sliding table after reaching the new repair position; S8: The control device starts the axial drive module and the axial drive device to drive the TIG welding gun to move axially in the reverse direction, so that the tungsten electrode returns to the starting axial position; S9: Repeat S3 to S6 until the inner diameter of the small threaded hole is increased to the required hole diameter; S10: Turn off the additive power supply, and after a preset time, turn off the water cooling water supply device and the air protection air supply device, and the additive repair process ends; S11: After the workpiece cools down, the workpiece is removed and the repair quality is evaluated; and the threaded hole repair operation of the next workpiece to be repaired is prepared.

[0014] According to the method for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the threaded hole to be repaired is enlarged before performing step S1.

[0015] The method for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention further includes the following steps: S12: Boring and tapping are performed on the repaired area of ​​the threaded hole.

[0016] The present invention provides a full-position additive repair system for the inner wall of a small-diameter threaded hole. The TIG welding gun of the present application has complete rotation, radial and axial drive devices, which can effectively meet the comprehensive repair operation requirements of the welding gun head in the threaded hole, and the arrangement of a water cooling water supply device and a shielding gas supply device provides the TIG welding gun with complete cooling and gas protection functions; at the same time, the input of additive parameters, the setting of the speed of each motor and the start and stop of each operation action during the repair process can be intuitively and effectively displayed and controlled through the human-computer interaction device and the control device. The entire repair operation process is effectively controlled in real time through the human-computer interaction system, and repair operations can be performed on threaded hole damage conditions of different diameters and different depth ranges. It has a wide range of applicability to working conditions. Compared with traditional threaded hole repair welding technology, it can effectively reduce the instability of manual repair welding and repair, and realize efficient and high-quality repair operations of the inner wall of the threaded hole at all positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a system block diagram of the all-position additive repair system for the inner wall of a small-diameter threaded hole of the present invention; Figure 2 It is a flowchart of the additive repair operation in the all-position additive repair system for the inner wall of a small-diameter threaded hole of the present invention; Figure 3 It is a timing diagram of the additive repair operation of the all-position additive repair system for the inner wall of a small-diameter threaded hole of the present invention; Figure 4 It is a schematic diagram of the structure of a TIG welding gun in the all-position additive repair system for the inner wall of a small-diameter threaded hole of the present invention; Figure 5 It is a schematic diagram of the internal structure of a TIG welding gun in the full-position additive repair system for the inner wall of a small-diameter threaded hole of the present invention.

[0019] Reference numerals: 100. TIG welding gun; 110. welding gun head; 120. radial sliding table; 130. rotary drive device; 140. axial drive device; 150. wire feeding device. DETAILED DESCRIPTION

[0020] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0023] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0025] Combine the following Figures 1 to 5 The system and method for all-position additive repair of the inner wall of a small-diameter threaded hole provided by an embodiment of the present invention are described in detail through specific embodiments and their application scenarios.

[0026] In the first aspect, in the embodiments of the invention, referring to Figures 1 to 5 The full-position additive repair system for the inner wall of a small-diameter threaded hole includes a TIG welding gun 100, a water cooling water supply device, a protective gas supply device, a TIG additive power supply, a control device and a human-machine interaction device. The TIG welding gun 100 includes a welding gun head 110, a radial sliding table 120, a rotary drive device 130 and an axial drive device 140. The welding gun head 110 is connected to the radial sliding table 120, the radial sliding table 120 is connected to the rotary drive device 130, and the rotary drive device 130 is connected to the axial drive device 140; the water cooling water supply device is connected to the welding gun head 1 10 is connected, the water cooling water supply device is suitable for providing cooling water to the welding gun head 110; the shielding gas supply device is connected to the welding gun head 110, and the shielding gas supply device is suitable for providing shielding gas to the welding gun head 110; the TIG additive power supply is electrically connected to the welding gun head 110, the water cooling water supply device, and the shielding gas supply device; the control device is respectively connected to the radial sliding table 120, the rotation drive device 130, the axial drive device 140, the water cooling water supply device, the water cooling water supply device and the TIG additive power supply signal; the human-machine interaction device is signal-connected to the control device.

[0027] The welding gun head 110 is responsible for generating an arc and directing the arc to the workpiece surface. A gas channel and a wire feeding pipeline are provided inside the welding gun head 110 to ensure gas protection and wire feeding. In addition, the welding gun head 110 is also provided with a tungsten electrode and an interface for connecting an external device.

[0028] The radial sliding platform 120 allows the welding gun head 110 to move radially to adapt to threaded holes of different diameters. This allows the welding gun to be close to or away from the center of the threaded hole to achieve welding at different positions.

[0029] The rotary drive device 130 is used to drive the welding gun head 110 to rotate around the axis of the threaded hole to achieve annular welding and ensure the uniformity and integrity of the weld.

[0030] The axial drive device 140 is used to drive the welding gun head 110 to move along the axial direction of the threaded hole to cover the entire repair area, so that the welding gun can move in the length direction of the threaded hole, thereby achieving full-position repair.

[0031] The water cooling water supply device is connected to the welding gun head 110 and is used to provide cooling water to the welding gun head 110 to prevent the welding gun from overheating at high temperatures, extend the service life of the welding gun and ensure the safety of the welding process.

[0032] The shielding gas supply device is connected to the welding gun head 110, and is used to provide shielding gas (usually an inert gas such as argon) to the welding gun head 110, protecting the arc and the molten pool from the influence of active gases such as oxygen in the outside air, preventing oxidation and mixing of impurities, and improving welding quality.

[0033] The TIG additive power source welding gun head 110, the water cooling water supply device and the shielding gas supply device are electrically connected. By adjusting parameters such as current and voltage, the TIG additive power source can achieve refined control of the welding process.

[0034] The control device is respectively connected with the radial sliding table 120, the rotary drive device 130, the axial drive device 140, the water cooling water supply device, the protective gas supply device and the TIG additive power supply signal. The control device receives instructions from the human-machine interaction device and controls the actions of each actuator according to the instructions to ensure the smooth progress of the welding process.

[0035] The human-machine interaction device is connected to the control device by signal. Through the touch screen or other input devices, the user can set welding parameters, monitor various signals and data during the welding process, and control various actions during the welding process in real time. This makes the operation more intuitive and convenient, and reduces the possibility of human error.

[0036] The TIG welding gun 100 of the present application is equipped with a complete rotary drive device 130, a radial sliding table 120 and an axial drive device 140, which can effectively meet the comprehensive repair work requirements of the welding gun head 110 in the threaded hole, and the setting of the water cooling water supply device and the protective gas supply device provides the TIG welding gun 100 with complete cooling and gas protection functions; at the same time, through the human-computer interaction device and the control device, the input of additive parameters, the setting of the speed of each motor and the start and stop of each operation action during the repair process can be intuitively and effectively displayed and controlled. The entire repair operation process is effectively controlled in real time through the human-computer interaction system, and repair operations can be performed on threaded hole damage conditions of different diameters and different depth ranges. It has a wide range of applicability to working conditions. Compared with traditional threaded hole repair welding technology, it can effectively reduce the instability of manual repair welding and repair, and realize efficient and high-quality repair operations at all positions of the inner wall of the threaded hole.

[0037] In one embodiment, the control device includes a processor module, a rotation drive module, a radial drive module, an axial drive module and a high-frequency arc ignition module. The processor module is respectively connected to the rotation drive module, the radial drive module, the axial drive module and the high-frequency arc ignition module by signal. The processor module sends a control signal to the rotation drive device 130 through the rotation drive module according to the received control instruction or preset program; or sends a control signal to the radial sliding table 120 through the radial drive module; or sends a control signal to the axial drive device 140 through the axial drive module; or sends a control signal to the TIG additive power supply through the high-frequency arc ignition module.

[0038] Specifically, the processor module adopts the STM32 MCU based on the ARM Cortex-M4 core, which has excellent computing power and rich peripheral resources. It can meet the requirements of the additive repair control system for response speed and control accuracy, control the repair process in an orderly manner, and receive and process various signals and data in the repair process.

[0039] The processor module is respectively connected to the rotary drive module, the radial drive module, the axial drive module and the high-frequency arc ignition module to output control signals to the rotary drive device 130, the radial sliding table 120, the axial drive device 140 and the TIG additive power supply.

[0040] The rotation driving module receives the control signal from the processor module and converts the control signal into a driving signal suitable for the rotation driving device 130 to control the action of the rotation driving device 130 .

[0041] The radial driving module receives the control signal from the processor module and converts the control signal into a driving signal suitable for the radial sliding stage 120 to control the movement of the radial sliding stage 120 .

[0042] The axial driving module receives the control signal from the processor module and converts it into a driving signal suitable for the axial driving device 140 to control the action of the axial driving device 140 .

[0043] The TIG additive power supply adopts a fully digital pulse TIG additive power supply with a rated input voltage of up to 3×380VAC, a rated output current of 5A~350A continuously adjustable, a rated output power of approximately 10kW, and an adjustable pulse frequency of 0-1kHz. It adopts a digital control system and uses a fully digital waveform modulation method to perform fine-grained control of additive repair parameters to ensure the process quality of arc additive repair in all positions.

[0044] Reference Figure 4 and Figure 5 In one embodiment, the full-position additive repair system for the inner wall of a small-diameter threaded hole also includes a wire feeding device 150, and the wire feeding device 150 and the welding gun head 110 are arranged at opposite ends of the rotation drive device 130, and the control device includes a wire feeding drive module, which is suitable for controlling the wire feeding device 150 to feed wire to the welding gun head 110.

[0045] Reference Figure 4 and Figure 5 Further, the welding gun head 110 is connected to the radial sliding table 120 to realize radial movement of the welding gun head 110. The radial sliding table 120 is connected to the rotary drive device 130 to realize synchronous rotary movement of the radial sliding table 120 and the welding gun head 110. The rotary drive device 130 is connected to the axial drive device 140 to realize axial movement of the rotary drive device 130, thereby driving the radial sliding table 120 and the welding gun head 110 to perform axial movement. The rotary drive device 130 is connected to the wire feeding device 150 to realize that the welding wire is delivered to the tungsten electrode discharge area.

[0046] Furthermore, the welding gun head 110 adopts a metal electrode rod; a tungsten electrode is provided at one end of the welding gun head 110; a gas-water distribution chamber for connecting an external gas supply device and an external water cooling device and a conductive ear for connecting an external power supply are provided at the end of the welding gun head 110 away from the tungsten electrode; a gas channel and a wire feeding pipeline are opened inside the welding gun head 110.

[0047] It is understandable that the wire feeding device 150 is used to feed welding wire to the welding gun head 110. The welding wire is a material used to fill the damaged area of ​​the threaded hole during the additive repair process. The wire feeding device 150 can accurately control the feeding speed and amount of the welding wire to ensure the welding quality. The wire feeding device 150 and the welding gun head 110 are arranged at opposite ends of the rotary drive device 130. To ensure that the distance between the welding gun head 110 and the wire feeding device 150 is moderate, it is convenient for the smooth delivery of the welding wire. The wire feeding drive module is a part of the control device, which is specifically used to control the action of the wire feeding device 150. It receives the control signal from the processor module and converts it into a drive signal suitable for the wire feeding device 150.

[0048] In one embodiment, the control device further includes a digital communication module, and the processor module is connected to the human-machine interaction device through the digital communication module to set and display the repair parameters of the TIG welding gun 100 in real time during the repair process.

[0049] Specifically, the processor module is connected to the human-computer interaction device through a digital communication module, and the digital communication module adopts RS485 to realize the setting and real-time display of repair parameters during the repair process.

[0050] In one embodiment, the control device also includes a repair current sampling module and an additive voltage sampling module, which are connected to the TIG additive power supply to monitor the arc starting parameters and repair parameters of the TIG welding gun 100 in real time during the repair process.

[0051] Specifically, the repair current sampling module is responsible for real-time monitoring of the current value flowing through the TIG welding gun 100 during the repair process. By real-time monitoring of the current value, abnormal conditions in the welding process, such as unstable current, short circuit or open circuit, can be discovered in time, so that corresponding measures can be taken to adjust and ensure welding quality and stability.

[0052] The additive voltage sampling module is responsible for real-time monitoring of the voltage value at both ends of the TIG welding gun 100 during the repair process. This voltage value is another important parameter in the welding process. By real-time monitoring of the voltage value, the stability of the welding arc and the performance of the welding power supply can be evaluated, and then the welding parameters can be adjusted to obtain better welding results.

[0053] In one embodiment, the radial sliding table 120 and the axial driving device 140 respectively include one or more limit switches, which are respectively installed at both ends of the maximum travel range of the radial sliding table 120 and the axial driving device 140, and the control device includes an emergency stop protection module, through which the limit switch is connected to the processor module to ensure the normal operation of the equipment.

[0054] It is understandable that the limit switches are installed at both ends of the maximum travel range of the radial sliding table 120 and the axial drive device 140, respectively. When the radial sliding table 120 or the axial drive device 140 moves to its maximum allowable position, the corresponding limit switch will be triggered. The limit switch provides a physical boundary to prevent the device from exceeding its designed working range. Once triggered, the limit switch will send a signal to the emergency stop protection module, thereby triggering a series of protection measures.

[0055] The emergency stop protection module receives signals from the limit switches and executes corresponding protection measures based on these signals. The corresponding protection measures may include immediately stopping the movement of the equipment, issuing an alarm signal, or shutting off the power supply.

[0056] The emergency stop protection module is connected to the processor module through a signal connection. When the emergency stop protection module receives a signal from the limit switch, it can immediately notify the processor module, and the processor module can take corresponding measures according to the preset program or logic.

[0057] In this way, by limiting the range of motion of the equipment, the limit switch and emergency stop protection module can prevent the equipment from being damaged due to exceeding the design range, thereby improving the safety of the entire system.

[0058] In one embodiment, the processor module is connected to the water cooling water supply device and the protective gas supply device respectively through relays.

[0059] It can be understood that, in this embodiment, the relay provides electrical isolation between the processor module and the water cooling water supply device and the protective gas supply device, thereby ensuring the safety and stability of the system.

[0060] Specifically, the processor module is connected to the water cooling water supply device and the shielding gas supply device through relays. The water cooling water supply device uses a TIG welding cooling water tank with a capacity of up to 10L and a water pump transmission speed of up to 3.5L / min, which can quickly absorb the heat generated by the welding gun operation; the shielding gas supply device uses an argon gas bottle with a pressure flow regulating valve.

[0061] In a second aspect, the present invention further provides a method for all-position additive repair of the inner wall of a small-diameter threaded hole, comprising the following steps: S1: Connect the positive terminal of the additive power supply to the TIG welding gun 100, and the negative terminal to the workpiece of the threaded hole to be repaired. Use the positioning tool to extend the TIG welding gun 100 to the designated repair position of the threaded hole to be repaired, adjust the position of the TIG welding gun 100 so that the tungsten electrode of the TIG welding gun 100 coincides with the designated repair position, and fix the TIG welding gun 100 with a clamp.

[0062] S2: Select appropriate additive process parameters through the human-machine interaction device, such as a pulse current base value of 40~60A, a peak value of 80~120A, a frequency of 10~1kHz, and a duty cycle of 50%, and send a start signal to control the water cooling water supply device to supply water and the gas protection gas supply device to supply gas.

[0063] S3: The control device starts the high-frequency arc striking module and the TIG additive power supply to achieve high-frequency and high-voltage arc striking. After the arc striking is successful, the high-frequency arc striking module is turned off and the repair current rise stage is entered.

[0064] S4: After the repair current rises to a stable stage, the repair operation begins. The control device starts the wire feeding drive module and the wire feeding device 150, driving the welding wire to be transported to the area to be repaired at a set speed. At the same time, the control device also starts the rotation drive module and the rotation drive device 130, the axial drive module and the axial drive device 140, respectively, driving the welding gun head 110 to rotate and move axially at the speeds of 0r / min~5r / min and 10mm / min~12mm / min respectively.

[0065] S5: According to the speed of axial movement, determine whether the tungsten electrode has completed the preset axial distance, such as 150 mm; after determining that it has completed, turn off the rotary drive device 130, the axial drive device 140 and the wire feeding device 150; the repair current enters a descending stage until the arc is extinguished.

[0066] S6: Then determine whether the inner diameter of the small threaded hole is increased to the required hole diameter, for example, Φ20mm; if it is not increased to the required hole diameter, execute steps S7 to S9; if it is increased to the required hole diameter, execute step S10.

[0067] S7: The control device starts the radial drive module and the radial sliding table 120 to drive the welding gun head 110 to move radially for a certain distance at a set speed. After reaching the new repair position, the radial sliding table 120 is closed.

[0068] S8: The control device starts the axial drive module and the axial drive device 140 to drive the TIG welding gun 100 to move axially in the reverse direction, so that the tungsten electrode returns to the initial axial position.

[0069] S9: Repeat steps S3 to S6 until the inner diameter of the small threaded hole is increased to the required hole diameter.

[0070] S10: Turn off the additive power supply, and after a preset time, turn off the water cooling water supply device and the air protection air supply device, and the additive repair process ends.

[0071] S11: After the workpiece cools down, the workpiece is removed and the repair quality is evaluated; and the threaded hole repair operation of the next workpiece to be repaired is prepared.

[0072] S12: The threaded hole repair area is bored to Φ21.5mm and tapped to finally realize the repair process of the damaged threaded hole.

[0073] The threaded hole to be repaired also includes expanding the damaged threaded hole to Φ26 mm before steps S1 to S11.

[0074] The present invention can adapt to the repair operation requirements of the inner wall of a threaded hole with a minimum diameter of 24 mm and a maximum depth of 190 mm. It has the advantages of reliable structure, flexible operation, and strong operational adaptability, and solves the repair problem in the narrow space of a small-diameter threaded hole.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-position additive repair system for the inner wall of a small-diameter threaded hole, characterized in that: include: A TIG welding gun, the TIG welding gun comprising a welding gun head, a radial sliding table, a rotary drive device and an axial drive device, the welding gun head is connected to the radial sliding table, the radial sliding table is connected to the rotary drive device, and the rotary drive device is connected to the axial drive device; A water cooling water supply device, the water cooling water supply device is connected to the welding gun head, and the water cooling water supply device is suitable for providing cooling water to the welding gun head; A shielding gas supply device, the shielding gas supply device is connected to the welding gun head, and the shielding gas supply device is suitable for providing shielding gas to the welding gun head; A TIG additive power source, the TIG additive power source is electrically connected to the welding gun head, the water cooling water supply device, and the shielding gas supply device; A control device, wherein the control device is respectively connected to the radial sliding table, the rotary drive device, the axial drive device, the water cooling water supply device, the water cooling water supply device and the TIG additive power supply signal; A human-machine interaction device is connected to the control device by signals.

2. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to claim 1 is characterized in that: The control device includes a processor module, a rotation drive module, a radial drive module, an axial drive module and a high-frequency arc ignition module, the processor module is respectively connected to the rotation drive module, the radial drive module, the axial drive module and the high-frequency arc ignition module by signal, and the processor module sends a control signal to the rotation drive device through the rotation drive module according to the received control instruction or preset program; Alternatively, a control signal is sent to the radial sliding stage through the radial driving module; Alternatively, a control signal is sent to the axial drive device through the axial drive module; Alternatively, a control signal is sent to the TIG additive power source through the high-frequency arc starting module.

3. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to claim 2, characterized in that: The full-position additive repair system for the inner wall of a small-diameter threaded hole also includes a wire feeding device, and the wire feeding device and the welding gun head are arranged at two opposite ends of the rotary drive device. The control device includes a wire feeding drive module, and the wire feeding drive module is suitable for controlling the wire feeding device to feed wire to the welding gun head.

4. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to claim 2, characterized in that: The control device also includes a digital communication module, and the processor module is connected to the human-machine interaction device through the digital communication module to set and display the repair parameters of the TIG welding gun in real time during the repair process.

5. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to claim 2, characterized in that: The control device also includes a repair current sampling module and an additive voltage sampling module, and the repair current sampling module and the additive voltage sampling module are connected to the TIG additive power supply to monitor the arc starting parameters and repair parameters of the TIG welding gun in real time during the repair process.

6. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to claim 2, characterized in that: The radial sliding table and the axial driving device respectively include one or more limit switches, and the limit switches are respectively installed at both ends of the maximum travel range of the radial sliding table and the axial driving device. The control device includes an emergency stop protection module, and the limit switch is connected to the processor module through the emergency stop protection module.

7. The all-position additive repair system for the inner wall of a small-diameter threaded hole according to any one of claims 2 to 6, characterized in that: The processor module is connected to the water cooling water supply device and the protective gas supply device respectively through relays.

8. A method for all-position additive repair of the inner wall of a small-diameter threaded hole, using the all-position additive repair system for the inner wall of a small-diameter threaded hole according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Connect the positive terminal of the additive power supply to the TIG welding gun, and the negative terminal to the workpiece of the threaded hole to be repaired. Use the positioning tool to extend the TIG welding gun to the designated repair position of the threaded hole to be repaired. Adjust the position of the TIG welding gun so that the tungsten electrode of the TIG welding gun coincides with the designated repair position, and fix the TIG welding gun with a clamp; S2: Select appropriate additive process parameters through the human-machine interaction device, send a start signal, control the water cooling water supply device to supply water and the air protection air supply device to supply air; S3: The control device starts the high-frequency arc striking module and the TIG additive power supply to achieve high-frequency and high-voltage arc striking. After the arc striking is successful, the high-frequency arc striking module is turned off to enter the repair current rising stage; S4: After the repair current rises to a stable stage, the repair operation begins. The control device starts the wire feeding drive module and the wire feeding device to drive the welding wire to be transported to the repair area at a set speed. At the same time, the control device also starts the rotation drive module and the rotation drive device, the axial drive module and the axial drive device, respectively, to drive the welding gun head to rotate and move axially at the set speed at the same time. S5: judging whether the tungsten electrode has traveled the preset axial distance according to the speed of axial movement; after judging that the tungsten electrode has traveled the preset axial distance, the rotary drive device, the axial drive device and the wire feeding device are turned off; the repair current enters the descending stage until the arc is extinguished; S6: Then determine whether the inner diameter of the small threaded hole is increased to the required hole diameter; if it is not increased to the required hole diameter, execute steps S7 to S9; if it is increased to the required hole diameter, execute step S10; S7: The control device starts the radial drive module and the radial sliding table, drives the welding gun head to move radially for a certain distance at a set speed, and closes the radial sliding table after reaching the new repair position; S8: The control device starts the axial drive module and the axial drive device to drive the TIG welding gun to move axially in the reverse direction, so that the tungsten electrode returns to the starting axial position; S9: Repeat steps S3 to S6 until the inner diameter of the small threaded hole is increased to the required hole diameter; S10: Turn off the additive power supply, and after a preset time, turn off the water cooling water supply device and the air protection air supply device, and the additive repair process ends; S11: After the workpiece cools down, the workpiece is removed and the repair quality is evaluated; and the threaded hole repair operation of the next workpiece to be repaired is prepared.

9. The method for all-position additive repair of the inner wall of a small-diameter threaded hole according to claim 8, characterized in that: The threaded hole to be repaired is enlarged before step S1.

10. The all-position additive repair method for the inner wall of a small-diameter threaded hole according to claim 8, characterized in that: The following steps are also included: S12: Boring and tapping are performed on the repaired area of ​​the threaded hole.

Images