Low-voltage micro-arc robot high-efficiency milling machining platform

Abstract

The application relates to the technical field of special processing, and discloses a low-pressure micro-arc robot high-efficiency milling processing platform which comprises a six-axis industrial robot, a six-axis industrial robot mounting base, a platform base plate and a low-pressure micro-arc processing spindle; the platform base plate is embedded with an arc-shaped sliding rail, the robot mounting base is slidably arranged on the sliding rail, and the low-pressure micro-arc processing spindle is carried at the tail end of the robot. The application removes materials by relying on high-temperature arc plasma ablation, and the efficiency can be dozens of times of that of traditional electric sparks, the bottleneck of large-amount cutting of difficult-to-process materials is broken, no macro cutting force is generated during processing, vibration and tool setting errors caused by insufficient rigidity of the milling robot can be eliminated, the processing precision is improved, the requirements of aviation parts are met, the electrode loss is extremely low, the cost can be reduced, workpiece deformation can be avoided, energy consumption is significantly reduced, multi-process in-situ one-stop processing is realized, auxiliary working hours are greatly compressed, and the platform is suitable for large castings and forgings and multi-variety small-batch production.

Description

Technical Field

[0001] This invention relates to the technical field of special processing, and in particular to a low-pressure micro-arc robot high-efficiency milling processing platform. Background Technology

[0002] With the rapid development of high-end manufacturing fields such as aerospace, military, and nuclear power, the application of difficult-to-machine materials such as titanium alloys and high-temperature alloys is becoming increasingly widespread. These materials have high strength and poor thermal conductivity, and the workpieces often have complex features such as riser roots and narrow and deep flow channels, making them difficult to machine. When using traditional mechanical milling, tool wear is severe, the machining efficiency and surface quality are poor, and the rigidity requirements of the machine tool are extremely high. Manual grinding has problems such as low efficiency, high labor intensity, and unstable machining accuracy and consistency.

[0003] Low-voltage micro-arc discharge machining, as a high-efficiency and high-quality discharge machining technology, has significant advantages in the processing of difficult-to-machine materials. Industrial robots, with their high flexibility, large working space and low cost, are gradually replacing some of the processing functions of traditional machine tools. However, robots generally have the problem of low structural rigidity, making it difficult to withstand the reaction force during the processing. This not only limits the range of materials that can be processed, but also seriously affects the processing accuracy and surface quality. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a low-pressure micro-arc robot high-efficiency milling platform.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a low-pressure micro-arc robot high-efficiency milling processing platform, comprising a six-axis industrial robot, a six-axis industrial robot mounting base, and a platform base plate. The platform base plate is the load-bearing foundation of the entire processing area. Its bottom surface is fixed to the ground by anchor bolts or shock-absorbing pads. The base of the six-axis industrial robot is rigidly fixed to the upper surface of the six-axis industrial robot mounting base by bolts and moves together with the base. An arc-shaped slide rail is fixedly embedded on the outside of the platform base plate. The arc-shaped slide rail is fixed to the upper surface of the platform base plate by bolts or T-slots. Its arc-shaped guide rail surface faces the working area. The six-axis industrial robot mounting base is slidably mounted on the outside of the arc-shaped slide rail. The bottom of the six-axis industrial robot mounting base is equipped with a slider or gear drive mechanism, which slides and cooperates with the arc-shaped slide rail. It can move along a predetermined arc on the arc-shaped slide rail and lock, so as to realize its movement with the arc-shaped slide rail. The six-axis industrial robot has a low-pressure micro-arc machining spindle mounted on the external end of its robotic arm via a flange.

[0006] As a preferred technical solution of the present invention, a connecting flange is fixedly installed on the outside of the low-pressure micro-arc machining spindle. The end of the connecting flange away from the six-axis industrial robot is fixedly connected to the outer shell of the low-pressure micro-arc cutter body. The inner cavity of the outer shell of the low-pressure micro-arc cutter body is fixedly installed with a motor and a bearing seat in sequence by bolts. The bearing seat is fixedly sleeved on the outside of the motor. The spindle is set inside the motor and the motor is used to drive the spindle to rotate.

[0007] As a preferred technical solution of the present invention, the spindle passes through the precision bearing assembly in the bearing housing to achieve radial and axial support, and can rotate at high speed and smoothly. The outer ring of the bearing housing is fixed inside the housing of the low-pressure micro-arc tool by press fitting or bolting. The end of the spindle away from the motor output shaft is fixedly installed with a chuck by the cooperation of a locking nut and a tapered surface. The chuck is used to hold the tool electrode.

[0008] As a preferred embodiment of the present invention, a power-on interface is fixedly embedded in the outer shell of the low-pressure micro-arc cutter. The power-on interface is embedded in the outside of the outer shell of the low-pressure micro-arc cutter by setting screws. A carbon brush is fixedly embedded inside the outer shell of the low-pressure micro-arc cutter. The internal wires of the power-on interface pass through the outside of the outer shell of the low-pressure micro-arc cutter and extend to connect with the carbon brush. The conductive contact surface of the carbon brush is elastically pressed against the conductive slip ring provided at the rear of the spindle. The current of the external pulse power supply is conducted to the tool electrode through the carbon brush → slip ring → spindle → chuck, realizing reliable power supply during rotation.

[0009] As a preferred technical solution of the present invention, the outer shell of the low-pressure micro-arc cutter is provided with a gas-liquid conversion connector. The gas-liquid conversion connector is installed on the corresponding hole on the outer shell of the low-pressure micro-arc cutter by thread, and the gas-liquid conversion connector is located inside the connecting flange. It can be connected to an external compressed air or atomized medium pipeline. The medium is sprayed to the discharge processing area through the internal flow channel of the shell or the external nozzle, which plays a role in chip removal and cooling.

[0010] As a preferred embodiment of the present invention, a workbench base is fixedly embedded inside the platform substrate by bolts, and a workbench is fixedly installed on the top of the workbench base. The workbench is a cast iron platform with a T-slot for clamping workpieces. A cutting water outlet is opened on the side surface of the platform substrate near the workbench, which is connected to a filtration and recovery system through a pipeline for discharging waste liquid and etching products generated during processing.

[0011] As a preferred embodiment of the present invention, platform side plates are vertically mounted on the four edges of the platform substrate by bolts. The platform side plates form a U-shape, constituting a protective enclosure around the platform substrate.

[0012] As a preferred embodiment of the present invention, a platform support frame is installed on the outside of the platform base plate and the platform side plate. The platform support frame is a welded or cast frame structure, and its bottom is connected to the platform base plate and the platform side plate by bolts, which is used to further enhance the overall rigidity or suspend auxiliary equipment.

[0013] Compared with the prior art, the beneficial effects that this invention can achieve are: This invention utilizes the instantaneous high temperature of electric arc plasma to melt and remove metallic materials, achieving a removal speed several to tens of times faster than traditional electrical discharge machining (EDM). Its efficiency in machining high-strength steel risers rivals rough milling, effectively overcoming the industry bottleneck of large-mass removal of difficult-to-machine materials such as titanium alloys and high-temperature alloys. The machining process is free of macroscopic cutting forces, completely resolving the pain point of industrial robots being unable to withstand milling reaction forces due to low structural rigidity. It eliminates vibration and tool deflection errors, and, combined with adaptive arc voltage detection closed-loop stability, maintains the optimal discharge gap, significantly improving machining dimensional accuracy. Its tool electrode wear is extremely low, greatly reducing the cost of expensive electrodes. Simultaneously, the absence of macroscopic cutting forces avoids workpiece deformation and scrapping. Energy consumption per unit volume is significantly lower than traditional machining, offering the dual advantages of energy saving and raw material conservation. Furthermore, this technology enables one-stop in-situ machining of riser removal, cavity milling, and surface grinding, eliminating the need for multiple clamping, transfer transportation, and specialized tooling, significantly reducing auxiliary time. It is highly suitable for the production needs of large castings and forgings, as well as multi-variety, small-batch production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the low-pressure micro-arc robot high-efficiency milling platform of the present invention; Figure 2 This is a top view of the high-efficiency milling platform for low-pressure micro-arc robots of the present invention. Figure 3 This is a front view schematic diagram of the high-efficiency milling platform for low-pressure micro-arc robots of the present invention; Figure 4 This is a schematic diagram of the structure of the low-pressure micro-arc machining spindle of the present invention; Figure 5 This is a schematic diagram of the power-on device of the present invention; Figure 6 This is a schematic diagram of the low-pressure micro-arc machining spindle connection of the present invention.

[0015] The components include: 1. Six-axis industrial robot; 2. Six-axis industrial robot mounting base; 3. Arc-shaped slide rail; 4. Platform base plate; 5. Platform side plate; 6. Cutting fluid outlet; 7. Worktable; 8. Low-pressure micro-arc machining spindle; 81. Connecting flange; 82. Low-pressure micro-arc tool body shell; 83. Chuck; 84. Power interface; 85. Gas / liquid conversion connector; 86. Carbon brush; 87. Bearing housing; 88. Motor; 89. Spindle; 9. Platform support frame; 10. Worktable base. Detailed Implementation

[0016] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0017] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a low-pressure micro-arc robot high-efficiency milling platform includes a six-axis industrial robot 1, a six-axis industrial robot mounting base 2, and a platform base 4. The platform base 4 is the load-bearing foundation of the entire processing area. Its bottom surface is fixed to the ground by anchor bolts or shock-absorbing pads, which can evenly distribute the static load and processing dynamic load of the entire equipment, isolate the ground vibration from being transmitted to the processing area, and provide a unified, stable, and high-precision horizontal mounting reference for all functional components of the platform. The base of the six-axis industrial robot 1 is rigidly fixed to the six-axis industrial robot mounting base by bolts. The upper plane of platform base 2 moves together with the six-axis industrial robot mounting base 2. With its high degree of spatial flexibility and wide working radius thanks to the six-axis linkage, it can flexibly adjust the position and feed angle of the machining end effector, easily covering machining areas that are difficult for traditional machine tools to reach, such as narrow and deep flow channels and riser roots of complex workpieces. It adapts to the all-round machining needs of various types of irregularly shaped workpieces. An arc-shaped slide rail 3 is fixedly embedded on the outside of platform base 4. The arc-shaped slide rail 3 is fixed to the upper surface of platform base 4 by bolts or T-slots, with its arc-shaped guide surface facing the working area, allowing for the arc-shaped movement of the robot base. The system provides high-precision guiding support, ensuring the smoothness and positional accuracy of the robot's movement along the arc trajectory, effectively expanding the robot's processing coverage. The six-axis industrial robot mounting base 2 is slidably mounted on the outside of the arc-shaped slide rail 3. The bottom of the six-axis industrial robot mounting base 2 is equipped with a slider or gear drive mechanism, which slides and engages with the arc-shaped slide rail 3. It can move and lock along a predetermined arc on the arc-shaped slide rail 3, so as to realize its movement with the arc-shaped slide rail 3. It can drive the six-axis industrial robot 1 to adjust the work position along the arc trajectory, expanding the workpiece clamping state without changing the workpiece clamping state. With a large processing radius, it can adapt to the processing needs of large workpieces in different positions. After locking in place, it can ensure the positional rigidity of the robot base during processing. The platform base plate 4 is fixedly embedded with a worktable base 10 by bolts. The top of the worktable base 10 is fixedly installed with a worktable 7. The worktable 7 is a cast iron platform with T-slots for clamping workpieces. The high rigidity of the cast iron material can effectively absorb the vibration energy during processing. The densely distributed T-slots can flexibly adapt to the clamping needs of various tooling fixtures and workpieces of different sizes, providing a stable and reliable clamping and positioning reference for the workpiece.

[0018] The platform substrate 4 has a cutting water outlet 6 on the side surface near the worktable 7, which is connected to the filtration and recovery system through a pipeline to discharge the waste liquid and etching products generated during processing.

[0019] Platform side plates 5 are vertically mounted on the four edges of the platform substrate 4 by bolts. The platform side plates 5 form a U-shape, which constitutes a protective enclosure around the platform substrate 4. This can prevent molten chips and atomized media generated during processing from splashing outwards, isolate the strong light of the processing arc from leaking outwards, protect the safety of surrounding operators and equipment, and maintain the stability of the flow field environment in the processing area.

[0020] A platform support frame 9 is installed on the outside of the platform base plate 4 and the platform side plate 5. The platform support frame 9 is a welded or cast frame structure. The bottom is connected to the platform base plate 4 and the platform side plate 5 by bolts. It is used to further enhance the overall rigidity or suspend auxiliary equipment. It can effectively improve the overall structural strength and deformation resistance of the platform. At the same time, it can provide installation and suspension points for auxiliary equipment such as processing power supply and media supply unit, and optimize the overall spatial layout of the platform.

[0021] The six-axis industrial robot 1 has a low-pressure micro-arc machining spindle 8 mounted on its external end via a flange. A connecting flange 81 is fixedly mounted on the outside of the low-pressure micro-arc machining spindle 8. A low-pressure micro-arc cutter housing 82 is fixedly connected to the end of the connecting flange 81 furthest from the six-axis industrial robot 1. The connecting flange 81 ensures high-precision coaxial docking and rigid connection between the spindle and the robot's end effector. The low-pressure micro-arc cutter housing 82 provides sealing protection and mounting support for all internal electrical, transmission, and functional components, preventing external machining media and molten debris from intruding into the internal cavity. A motor 88 and a bearing housing 87 are sequentially fixedly mounted inside the low-pressure micro-arc cutter housing 82 via steps and bolts. The bearing housing 87 is fixedly sleeved on the outside of the motor 88. The motor 88 is the main... The rotating shaft provides stable and controllable power output, while the bearing housing 87 provides precise radial and axial support and positioning for the rotating components, ensuring coaxiality and smooth operation of the spindle at high speed. The motor 88 houses the spindle 89, which drives its rotation. The spindle 89 passes through a precision bearing assembly within the bearing housing 87, achieving radial and axial support and enabling high-speed, smooth rotation. The precision bearing assembly significantly reduces radial runout and axial movement of the spindle, ensuring the rotational accuracy of the tool electrode and improving the surface quality and dimensional consistency of the electrical discharge machining. The outer ring of the bearing housing 87 is fixed inside the low-pressure micro-arc tool housing 82 by press-fitting or bolting, ensuring a rigid connection between the bearing housing 87 and the housing and preventing relative displacement and vibration during operation. To provide a stable support base for the spindle's rotation, a chuck 83 is fixedly mounted on the end of the spindle 89 furthest from the output shaft of the motor 88 via a locking nut and a tapered surface. The chuck 83 is used to hold the tool electrode. The tapered surface structure ensures high-precision coaxial clamping between the electrode and the spindle. The locking structure provides reliable clamping force, preventing the electrode from loosening or shifting during high-speed rotation and machining. It also allows for quick replacement of tool electrodes of different specifications, flexibly adapting to different machining scenarios. A power interface 84 is fixedly embedded in the outer shell 82 of the low-pressure micro-arc cutter. The power interface 84 is screwed into the outside of the outer shell 82, allowing for quick connection to an external pulse power supply line to achieve stable input of machining power. The screw fixing method ensures the interface is secure. Securely mounted to prevent loosening and power loss due to vibration during processing, the low-pressure micro-arc cutter housing 82 contains a carbon brush 86. The internal wires of the power interface 84 pass through the exterior of the housing 82 and extend to connect to the carbon brush 86. The conductive contact surface of the carbon brush 86 is elastically pressed against a conductive slip ring located at the rear of the spindle 89. This allows the current from the external pulse power supply to be conducted through the carbon brush → slip ring → spindle → chuck to the tool electrode, ensuring reliable power supply during rotation. The elastic pressing structure ensures that the carbon brush 86 and slip ring maintain close contact at all times, effectively reducing contact resistance fluctuations under high-speed rotation, ensuring voltage stability during electrical discharge machining, and improving the uniformity of arc erosion. The exterior of the low-pressure micro-arc cutter housing 82 is equipped with a gas-liquid conversion connector 85.The gas-liquid conversion connector 85 is threaded onto the corresponding opening on the outer shell 82 of the low-pressure micro-arc tool. The gas-liquid conversion connector 85 is located inside the connecting flange 81 and can be connected to external compressed air, atomizing medium pipelines, and a central high-pressure water outlet pipeline. The central flushing circuit is powered by a high-pressure booster pump in an external central water outlet machine. After pressurizing the working medium to the set process pressure, it is transported through a high-pressure resistant sealed pipeline to the gas-liquid conversion connector 85. The medium enters the sealed chamber at the tail end of the spindle 89 and is then transported forward along the axially penetrating central flow channel inside the spindle 89, sequentially passing through the central through-hole of the chuck 83 and the internal flow channel of the tool electrode. Ultimately, the fluid is precisely sprayed from the central nozzle on the electrode end face to the core area of ​​the electrical discharge machining (EDM) process. The threaded connection provides a reliable seal and is easy to install and disassemble. The high-pressure central jet acts directly on the micron-sized discharge gap, powerfully flushing away molten debris and vaporized products generated by arc erosion. This prevents secondary discharges or short circuits caused by the accumulation of machining residue in narrow, deep cavities and at the bottom of the flow channels. Simultaneously, it provides precise and efficient targeted cooling to both the electrode end face and the workpiece surface, effectively suppressing electrode wear and workpiece thermal deformation, and stabilizing the dielectric insulation strength and flow field state of the discharge gap. This significantly improves the machining efficiency, dimensional control accuracy, and surface finish of low-pressure micro-arc milling.

[0022] The tool electrode can be made of graphite, copper-tungsten, or copper, and is in the shape of a rod, tube, or irregular cross section. Its lower end extends out of the central hole of the nozzle array. The multi-sensor integrated module is mounted between the fixed end and the moving end of the flexible hinge. It includes at least a differential voltage sensor, a Hall current sensor, and a micro strain force sensor to detect the inter-electrode voltage, discharge current, and micro-force generated by whether the electrode accidentally contacts the workpiece in real time.

[0023] Working principle: Before machining begins, the large workpiece is hoisted onto the worktable 7. After leveling and positioning, it is clamped and fixed using the T-slot fittings on the worktable to ensure that the workpiece position does not shift during machining, providing a stable force reference for subsequent electrical discharge machining. The six-axis industrial robot 1, relying on the six-axis industrial robot mounting base 2 on the arc-shaped slide rail 3, expands the arc-shaped workstation and, together with the workpiece clamping system, forms a seven-axis linkage machining system, which can cover the all-round machining area of ​​large workpieces, breaking through the limitation of the working radius of a single robot. Subsequently, the three-dimensional scanning point cloud data of the workpiece is imported into the offline programming software, the area to be removed is accurately delineated, and a multi-layer spiral milling machining path is planned and generated, setting the single machining depth parameters layer by layer. According to the machining allowance and cavity characteristics, a graphite electrode of the corresponding diameter is selected and clamped and fixed in the chuck 83 at the front end of the low-pressure micro-arc machining spindle 8. The coaxiality and clamping rigidity of the electrode clamping are ensured by the conical surface fit and the locking nut. The gas-liquid conversion connector 85 on the side of the low-pressure micro-arc machining spindle 8 is connected to the flushing pipeline with a rated pressure of 3.0MPa. The fluid is transferred through the gas-liquid conversion connector 85 to the center hole of the spindle 89 and then through the center hole of the electrode to be flushed out, which serves the purpose of chip removal and cooling. At the same time, the pulse power circuit is connected through the power interface 84, and the entire set of machining power parameters, including working voltage, peak current, pulse width and duty cycle, are set in the control cabinet, completing all the pre-machining preparations.

[0024] After parameter verification, the six-axis industrial robot 1, carrying the low-pressure micro-arc machining spindle 8, rapidly feeds to a safe standby position 50mm above the workpiece. It then starts the pulse power supply and controls the spindle to smoothly approach the machining surface. The pulse power supply current is continuously conducted through the power-on interface 84, carbon brush 86, and conductive slip ring at the tail of the spindle 89, and finally through the chuck 83 to the rotating tool electrode. The motor 88 drives the spindle 89 to rotate the graphite electrode at high speed and smoothly under the support of the precision bearing assembly in the bearing seat 87. After the gap between the electrode and the workpiece is broken down, a stable low-pressure micro-arc is formed. Relying on the instantaneous high temperature of the arc plasma, the surface metal of the workpiece is instantly vaporized and melted, achieving efficient material removal. During the machining process, the high-pressure gas-liquid medium is introduced into the internal flow channel of the spindle through the gas-liquid conversion connector 85 and continuously sprayed from the periphery of the electrode or the central hole of the spindle to the discharge machining area, promptly blowing the molten slag away from the machining gap and maintaining the cleanliness and stability of the discharge channel. No macroscopic cutting force is generated throughout the process, which will not cause machining vibration or tool deflection error. The graphite electrode wear is less than 1%, which can support long-term continuous and stable machining.

[0025] The entire platform is equipped with a high-pressure medium supply unit consisting of an air compressor, a gas filter dryer, a high-pressure water pump, an atomizer, and solenoid valves and pressure regulating valves. For special difficult-to-machine materials or deep cavity and narrow slot conditions, a high-pressure gas-liquid mixture can be sprayed out through the central hole of the coaxial tubular electrode. The medium is pumped out by the high-pressure pump, flows to the center of the spindle through the gas-liquid conversion joint, and is sprayed out from the end of the hollow electrode towards the discharge machining area, which plays a role in chip removal and cooling. The threaded connection is reliable in sealing and easy to disassemble and assemble. The gas and liquid media can be flexibly switched according to the machining conditions to promptly blow away molten debris in the machining area and cool the electrode and workpiece surface, maintain a stable discharge gap, and ensure continuous and efficient machining.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A low-pressure micro-arc robot high-efficiency milling platform, comprising a six-axis industrial robot (1), a six-axis industrial robot mounting base (2), and a platform base plate (4), wherein the base of the six-axis industrial robot (1) is rigidly fixed to the upper surface of the six-axis industrial robot mounting base (2) by bolts, characterized in that, The platform base plate (4) is fixedly fitted with an arc-shaped slide rail (3), and the six-axis industrial robot mounting base (2) is slidably mounted on the outside of the arc-shaped slide rail (3); The six-axis industrial robot (1) has a low-pressure micro-arc machining spindle (8) mounted on the outer end of its robotic arm via a flange.

2. The low-pressure micro-arc robot high-efficiency milling platform according to claim 1, characterized in that, The low-pressure micro-arc machining spindle (8) is externally fixedly mounted with a connecting flange (81). The end of the connecting flange (81) away from the six-axis industrial robot (1) is fixedly connected to a low-pressure micro-arc cutter housing (82). The inner cavity of the low-pressure micro-arc cutter housing (82) is fixedly mounted with a motor (88) and a bearing seat (87) in sequence by bolts. The bearing seat (87) is fixedly sleeved on the outside of the motor (88). The spindle (89) is set inside the motor (88).

3. The low-pressure micro-arc robot high-efficiency milling platform according to claim 2, characterized in that, The outer ring of the bearing housing (87) is fixed inside the housing (82) of the low-pressure micro-arc knife by press fitting or bolting. The end of the spindle (89) away from the output shaft of the motor (88) is fixedly installed with a chuck (83) by locking the nut and the conical surface.

4. The low-pressure micro-arc robot high-efficiency milling platform according to claim 3, characterized in that, The low-pressure micro-arc knife housing (82) is fixedly fitted with a power-on interface (84). The power-on interface (84) is fitted to the outside of the low-pressure micro-arc knife housing (82) by setting screws. A carbon brush (86) is fixedly fitted inside the low-pressure micro-arc knife housing (82). The internal wires of the power-on interface (84) pass through the outside of the low-pressure micro-arc knife housing (82) and extend to connect with the carbon brush (86).

5. The low-pressure micro-arc robot high-efficiency milling platform according to claim 4, characterized in that, The outer shell (82) of the low-pressure micro-arc knife is provided with a gas-liquid conversion connector (85). The gas-liquid conversion connector (85) is installed on the corresponding hole on the outer shell (82) of the low-pressure micro-arc knife by thread, and the gas-liquid conversion connector (85) is located inside the connecting flange (81).

6. The low-pressure micro-arc robot high-efficiency milling platform according to claim 1, characterized in that, The platform base plate (4) is fixedly embedded with a workbench base (10) by bolts. A workbench (7) is fixedly installed on the top of the workbench base (10). The workbench (7) is a cast iron platform with a T-slot and is used to clamp workpieces. A cutting outlet (6) is provided on the side surface of the platform substrate (4) near the worktable (7).

7. The low-pressure micro-arc robot high-efficiency milling platform according to claim 1, characterized in that, Platform side plates (5) are vertically installed on the four edges of the platform substrate (4) by bolts. The platform side plates (5) form a U-shape and constitute a protective enclosure around the platform substrate (4).

8. The low-pressure micro-arc robot high-efficiency milling platform according to claim 1, characterized in that, The platform base plate (4) and the platform side plate (5) are equipped with a platform support frame (9). The platform support frame (9) is a welded or cast frame structure. The bottom is connected to the platform base plate (4) and the platform side plate (5) by bolts to further enhance the overall rigidity or suspend auxiliary equipment.

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