Multi-wire plasma beam additive manufacturing equipment and regulation and control method

Abstract

The invention provides multi-wire plasma beam additive manufacturing equipment and a regulation and control method. The multi-wire plasma beam additive manufacturing equipment comprises a plasma beam fuse unit, a universal rotary wire feeding unit and a closed-loop detection regulation and control unit. The plasma beam fuse unit is used as a heat source to heat a wire in the universal rotary wire feeding unit; the universal rotary wire feeding unit comprises a multi-path wire feeding module, and the wire feeding direction of the multi-path wire feeding module can be adjusted; and the closed-loop detection regulation and control unit detects the working condition of each wire feeding passage in the multi-path wire feeding module and the components of the formed material, and feeds back and regulates the wire feeding rate of each wire feeding passage according to the detection condition. Under the condition that a plasma beam serves as a heat source, a forming process route can be preset through the digital control module, and real-time monitoring and protection are conducted, so that feedback adjustment is conducted in time, and it is guaranteed that the forming process is accurate in forming, uniform in component, high in forming efficiency and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a multi-filament plasma beam additive manufacturing device and a control method. Background Art

[0002] Plasma beam fuse technology is an additive manufacturing technology that uses plasma arc as a heat source and metal wire as a raw material. The software analyzes the parts layer by layer to generate a forming path. On the metal substrate, this path controls a moving molten pool, in which the externally supplied metal wire is melted to form metal droplets and continuously fed into the molten pool. By accumulating metal materials point by point, path by path, and layer by layer along the forming path, this technology can achieve fast, efficient and high-performance forming of parts. This manufacturing method plays an important role in the manufacture of engine components, gas turbine blades and other parts in high temperature and high pressure environments in the aerospace field, and in the manufacture and repair of large structural parts in the shipbuilding and marine engineering fields. In current industrial applications, the wire feeding mechanism of plasma beam fuse additive manufacturing is difficult to achieve isotropy during the printing process, and the number of wires is small, resulting in different and poor mechanical properties of the formed parts and low efficiency of the formed parts. Therefore, it is urgent to improve the wire feeding mechanism to improve the reliability and efficiency of the processing.

[0003] The traditional wire feeding mechanism of metal wire additive manufacturing printers mainly consists of a mounting base, a friction transmission wheel mounted on the mounting base, and a pressure wheel arranged longitudinally parallel to the friction transmission wheel. In the design of this wire feeding mechanism, there is a certain gap between the pressure wheel and the friction transmission wheel, forming an extrusion channel. Although this design is simple, it has limitations, namely, the contact surface during wire feeding is small, resulting in unstable loose wire, which may affect the quality and efficiency of printing, and the position is relatively fixed during the printing process, resulting in low printing reliability and unsatisfactory results.

[0004] Side-axis wire feeding is a common method of wire feeding for arc cladding, and its advantages include high material synthesis freedom, simple structure and strong reliability. This method avoids the "wire tying" problem and low forming efficiency during arc cladding by maintaining the front wire feeding state, thereby improving the process performance of arc additive manufacturing of components. However, when designing complex parts, it may be necessary to adjust the wire feeding position or rotate the worktable, which may limit the freedom of forming and make the path planning algorithm more complicated, and may also cause instability in the molten pool morphology.

[0005] Coaxial wire feeding is a commonly used wire feeding method in additive manufacturing technologies such as wire additive manufacturing and arc surfacing. It is a wire feeding method in which the welding wire is centered and the arc is hollow or sideways. In this method, the wire material is fed directly into the molten pool along the central axis of the work head and coaxially aligned with the heat source (such as laser or arc). Its advantages are directional independence, design freedom and the ability to print complex structures; coaxial wire feeding reduces disturbances and molten pool instability caused by improper wire feeding angles, which helps to achieve smoother printing surfaces and more consistent material deposition. However, coaxial wire feeding systems are usually more complex than other wire feeding systems, requiring precise mechanical and optical components to ensure coaxial alignment, which may lead to increased equipment costs; some coaxial wire feeding systems may have specific requirements for the type and form of materials used, such as restrictions on the diameter and flexibility of the wire, which may affect the selection and application range of materials; in some cases, because the heat source and the wire feeding mechanism are very close, the heat source may cause thermal interference to the wire feeding mechanism, and measures need to be taken for thermal insulation protection.

[0006] In addition, in plasma beam fuse additive manufacturing technology, the path planning limitations during the printing process and the control and monitoring of the entire set of equipment are difficult points. To achieve a certain logical operation control between devices, a lot of software programming is required for implementation, and monitoring requires some industrial cameras to achieve. In metal additive manufacturing, especially when using wire melting technologies such as plasma beam melting or laser melting, component missing may lead to a variety of shortcomings and problems, such as the mechanical properties of metals (such as strength, toughness and hardness), which are highly dependent on their microstructure and the distribution of alloying elements. Component missing may cause changes in the microstructure of the alloy, which in turn causes a decrease in mechanical properties. These problems not only affect the mechanical properties of the printed parts, but may also affect their chemical properties and overall performance. Therefore, in order to ensure the quality and performance of metal additive manufacturing parts, precise control of the composition of raw materials is a crucial link. Summary of the invention

[0007] In view of the defects in the prior art, an object of the present invention is to provide a multi-filament plasma beam additive manufacturing equipment and a control method.

[0008] A multi-wire plasma beam additive manufacturing equipment provided according to the present invention includes: a plasma beam fuse unit, a universal rotating wire feeding unit and a closed-loop detection and control unit;

[0009] The plasma beam fuse unit serves as a heat source to heat the wire material in the universal rotating wire feeding unit;

[0010] The universal rotating wire feeding unit comprises a multi-channel wire feeding module, and the wire feeding direction of the multi-channel wire feeding module can be adjusted;

[0011] The closed-loop detection and control unit detects the working condition of each wire feeding passage in the multi-channel wire feeding module and the composition of the formed material, and adjusts the wire feeding rate of each wire feeding passage according to the detection condition.

[0012] Preferably, the universal rotating wire feeding unit further comprises a wire heating module, and the wire heating module preheats the wire in the universal rotating wire feeding unit, and the preheated wire is heated by the plasma beam fuse unit.

[0013] Preferably, it further comprises a six-degree-of-freedom mechanical arm, and the universal rotary wire feeding unit is mounted on the six-degree-of-freedom mechanical arm;

[0014] The multi-channel wire feeding module includes a rotating disk and a plurality of wire feeding heads. The plurality of wire feeding heads are embedded in slots on the rotating disk. The wire feeding heads rotate around the slots to adjust the angles.

[0015] Preferably, the closed-loop detection and control unit includes a digital control module and a real-time monitoring module, wherein the digital control module provides a process path when the welding head is working and adjusts the wire feeding speed and wire feeding angle of the universal rotating wire feeding unit;

[0016] The real-time monitoring module monitors the process path and processing speed, monitors the working state of the universal rotary wire feeding unit, and monitors the composition of the formed material in real time, and feeds back the monitoring data to the digital control module.

[0017] Preferably, the real-time monitoring module includes a high-speed camera, an infrared camera and a spectrometer;

[0018] The high-speed camera monitors the printing path and printing speed in real time, the infrared camera monitors the temperature of the welding head and the molten pool, and judges whether the welding working path and the molten pool temperature are normal based on the real-time uploaded image and the temperature of the molten pool. The spectrometer is used to detect the lack of components.

[0019] Preferably, it also includes a PLC logic controller, which receives signals from the infrared camera, high-speed camera, spectrometer and input device, performs logical processing on the input data according to a preloaded program, and generates an output decision. The PLC logic controller sends the processing results to the output device.

[0020] A control method for multi-wire plasma beam additive manufacturing equipment provided by the present invention comprises:

[0021] Step S1: before the operation starts, the six-axis robot arm is instructed to perform simulated printing without producing filaments to verify the printing path;

[0022] Step S2: When starting processing, adjust the position of the wire and the welding head to maintain 2-4 mm, and adjust the angle between the wire feeding mechanism and the welding head;

[0023] Step S3: During the printing process, the wire feeding head always maintains the forward wire feeding direction under the preset path, and the wire heating module of the universal rotating wire feeding unit heats the wire.

[0024] Preferably, in step S1, when the high-speed camera detects a path change, an error signal is transmitted to the PLC logic controller. After the PLC logic controller detects the wrong path, it sends a digital signal to the digital numerical control system for adjustment.

[0025] Preferably, during the printing process, when the infrared camera detects that the temperature at the welding head changes, the signal is fed back to the PLC logic controller. When the PLC logic controller detects that the temperature changes too much, it sends a signal to the digital control system and executes the machine to adjust the power.

[0026] Preferably, during the printing process, when the spectrometer detects a change in the composition of the molding material, a signal is sent to the PLC logic controller, and the PLC logic controller sends a command to the wire feeding head with abnormal composition to adjust the wire feeding rate.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention can realize that the wire feeding mechanism and the welding head are in the same direction in space through the universal rotating wire feeding mechanism, and the wire feeding direction is always the front wire feeding, and the wire feeding angle can be flexibly adjusted, so as to ensure the high quality of the formed parts, good mechanical properties, and isotropic mechanical properties. The wire heating module of the universal rotating wire feeding mechanism can be preheated before welding to reduce thermal cracks and plasma beam energy load and improve the forming efficiency. The wire feeding rate of the wire feeding head can perform precise control work when the composition of the molten pool changes, so as to keep the formed composition uniform, thereby achieving good mechanical properties.

[0029] 2. The present invention can realize the integration of the whole system through the coordinated work of these software and hardware. Under the joint action of the digital control module and the real-time monitoring module, it can realize the conversion from digital models to complex metal parts, and immediately adjust the temperature, speed, composition and other parameters during the printing process when they change, so as to ensure the monitoring and control of the printing process, and at the same time ensure the accuracy and efficiency of the printing process. The development of this technology has brought unprecedented flexibility and innovation potential to the manufacturing industry.

[0030] 3. The present invention can pre-set the forming process route through the digital control module under the condition that the plasma beam is used as the heat source, and perform real-time monitoring and protection, so as to make timely feedback adjustments to ensure its precise forming, uniform composition, high forming efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 It is an overall schematic diagram of the multi-wire plasma beam additive manufacturing equipment in the present invention;

[0033] Figure 2 It is a partial schematic diagram of the universal rotating wire feeding unit in the present invention;

[0034] Figure 3 This is a control flow chart of the multi-wire plasma beam additive manufacturing equipment in the present invention;

[0035] Figure 4 It is a schematic diagram of the control of the high-speed camera in the present invention;

[0036] Figure 5 It is a schematic diagram of controlling the infrared camera of the present invention;

[0037] Figure 6 Schematic diagram of the control of the spectrometer in the present invention.

[0038] Description of reference numerals:

[0039]

[0040] DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0042] The present invention discloses a high-efficiency multi-wire plasma beam additive manufacturing equipment, which includes: a plasma beam fuse unit 8, a universal rotating wire feeding unit 5 and a closed-loop detection and control unit; wherein the plasma beam fuse unit 8 is used to heat the wire for additive manufacturing, the universal rotating wire feeding unit 5 has a multi-channel wire feeding structure, and the wire feeding direction of the wire feeding structure is adjustable, and the closed-loop detection and control unit monitors the working condition of each wire feeding structure in real time, detects the composition of the formed material, and is used to adjust the wire feeding rate of each wire feeding structure, thereby achieving the purpose of adjusting the composition of the molten pool. The present invention can pre-set the forming process route through the digital control module 1 under the condition that the plasma beam is the heat source, and perform real-time monitoring and protection, so as to timely perform feedback adjustment to ensure its precise forming, uniform composition, high forming efficiency and low cost.

[0043] Reference Figure 1 and Figure 2 , each part of the present invention is further described in detail below.

[0044] The plasma beam fuse unit 8 utilizes a plasma arc formed by compression of a tungsten electrode and a substrate under the conditions of a plasma power supply and an ion gas as a heat source, and performs additive manufacturing in the form of wire feeding.

[0045] The universal rotating wire feeding unit 5 includes a wire heating module 7 and a multi-channel wire feeding module. The wire heating module 7 is preheated in advance to reduce thermal cracks and reduce the energy load of the plasma beam fuse to improve the efficiency of the fuse. Specifically, the wire heating module 7 is closest to the wire tip and has a heating control that can achieve a specific temperature. This process is achieved through a temperature controller, which heats the Cr20Ni35D resistance wire. A temperature sensor of thermistor PT100 (-200℃-800℃) is used to detect the temperature of the resistance wire and feed the temperature data back to the control system.

[0046] The multi-channel wire feeding module can realize the melting of multiple components together, and the wire feeding direction is maintained as front wire feeding, and the wire feeding angle is maintained at the best forming angle of the wire to ensure good mechanical properties and forming quality of the formed parts. In addition, each wire feeding head 6 of the multi-channel wire feeding can adjust the wire feeding rate, the purpose is to adjust the molten pool composition in the closed-loop detection and control unit.

[0047] In a preferred embodiment, the multi-channel wire feeding module is illustrated by taking three-channel wire feeding as an example. This module contains three wire feeding heads 6 and a rotating disk. The three wire feeding heads 6 are embedded in the card slot under the rotating disk, and the angle can be adjusted around the card slot to ensure that the wire feeding direction is front wire feeding. The three-channel wire feeding module is installed on a six-degree-of-freedom robot 2, so it can print at any angle in three-dimensional space, greatly improving the flexibility and forming method of printing. The three wire feeding heads 6 use the wire feeding rate to accurately control the missing components of the molten pool, and the three wire feeding heads 6 can carry wires of different materials to realize multi-element alloy additive manufacturing, that is, the printing of high entropy alloys.

[0048] The closed-loop detection and control unit includes a digital control module 1 and a real-time monitoring module. The digital control module 1 provides the process path, wire feeding speed and wire feeding angle of the plasma beam welding head and the wire feeding mechanism when they are working to ensure their precise forming.

[0049] In a specific implementation, the digital control system is usually composed of a PC-based control system. It has the following key functions:

[0050] Input / output management: The control system receives input signals from various sensors (such as temperature and position sensors) and adjusts machine parameters based on these signals. The system controls the output to the drive devices (such as motors, wire feeders, heat sources, etc.) to ensure that they operate according to the predetermined program.

[0051] Motion control: The control system must precisely control the movement of the print head and worktable, which is achieved through stepper motors. The calculations involved in motion control include path planning and real-time speed and acceleration adjustments to ensure printing accuracy and surface quality.

[0052] Thermal management: In wire additive manufacturing, the control system needs to accurately control the power of the heat source to maintain an appropriate melt pool temperature. The system also needs to monitor the heat accumulation and distribution during the printing process to prevent the material properties from being damaged due to uneven cooling.

[0053] Synchronous control: Wire feeding speed, print head moving speed and heat source power need to be highly synchronized to ensure uniform deposition of material and excellent forming quality.

[0054] Safety monitoring: The control system also includes safety monitoring functions, such as abnormality detection, emergency stop processing, etc., to ensure the safety of operators and equipment.

[0055] Digital control module 1 software principle. Modeling is performed by digital industrial software such as CAD, and necessary modifications and optimizations are made to meet the needs of additive manufacturing. Then the slicing software is imported to convert the CAD model into layers of slices, and the corresponding G-code CNC robot language is generated to guide the specific actions of the printer. The software calculates the path of each layer and sets parameters such as layer height, filling strategy, heat source power, and wire feeding speed. Before actual printing, the simulation software can simulate the printing process to help identify possible problems, such as insufficient support structure, excessive thermal stress, etc. This helps to optimize parameter settings and reduce material waste and failure rate in actual printing.

[0056] The real-time monitoring module includes a high-speed camera 9, an infrared camera 10 and a spectrometer 4, wherein the high-speed camera 9 and the infrared camera 10 perform real-time monitoring and protection of the welding work; the high-speed camera 9 monitors the printing forming path and the printing speed in real time; the infrared camera 10 is used to monitor the temperature of the welding head and the molten pool, and judges whether the welding working path and the molten pool temperature are normal according to the real-time uploaded image and the temperature of the molten pool; the spectrometer 4 is used to detect the lack of components; when a component loss is found, the feedback signal is sent to the digital control module 1 to increase the wire feeding rate to accurately control the component, thereby adjusting the molten pool composition.

[0057] In a specific embodiment, the real-time monitoring module realizes automated real-time monitoring and adjustment through an industrial programmable logic controller (PLC). The working steps are mainly divided into three parts. The PLC receives signals from the infrared camera 10, the high-speed camera 9, the spectrometer 4 and the input device. Then, according to the preloaded program, the CPU performs logical processing on the input data and generates an output decision. The PLC sends the processing result to the output device and performs corresponding operations for protection. For example, when the PLC receives a signal from the spectrometer 4 that an element in the molten pool is evaporated, the PLC processes the signal and makes a decision on precise control, and then sends the final decision signal to the output device of the wire feeder 6 to perform the corresponding precise control operation.

[0058] Reference Figure 3 As shown, the present invention also discloses a method for precise control of components of high-efficiency multi-filament plasma beam additive manufacturing equipment, comprising the following steps:

[0059] Step S1: After receiving the computer command, the six-axis robot performs simulation printing without filament production. If a stuck position, i.e. a dead point, is encountered during the path simulation, the robot can stop automatically and make a sound through the feedback system. The speed of simulation printing is much faster than that of formal printing to improve efficiency. The robot contains multiple stepper motors and sensors, including angle sensors, linear velocity sensors and angular velocity sensors, and timely adjustments are made through the digital feedback signals of the sensors.

[0060] Step S2: When starting processing, the position of the welding head is adjusted by numerical control, and the position of the wire and the welding head is maintained at 2-4 mm. The angle sensor of the rotating disk adjusts the angle of the wire feeding mechanism and the welding head.

[0061] Step S3: Preparation is completed and printing is ready to start. First, the metal wire of the wire supply disk is pulled to the wire supply device, which is responsible for smoothly pulling the wire out of the disk; then the wire is pushed by a set of drive rollers, which accurately control the conveying speed and stability of the wire. The drive rollers are usually driven by an electric motor and can be accurately adjusted to match the wire feed rate required during the printing process; finally, the wire comes out of the drive mechanism and passes through the wire guide tube, which guides the wire to the welding head to ensure that the wire will not bend or kink during the conveying process. During the printing process, the wire feeding head 6 always maintains the forward wire feeding direction under the preset path, and the Cr20Ni35D resistance wire heats the wire feeding head 6.

[0062] The specific working steps of the closed-loop detection and control unit include:

[0063] a. When pre-printing starts, the high-speed camera 9 monitors the printing path in real time. When the welding head and wire feeder 6 are blocked or changed due to energy control problems or other problems, the high-speed camera 9 detects the change in the path and immediately transmits a signal to the PLC logic controller 3. If an error path is detected, a digital signal is immediately sent to the CNC system to adjust the welding head energy or stop working. Figure 4 shown.

[0064] b. After the printing work starts, the infrared camera 10 starts to monitor the temperature of the printing place, mainly detecting the temperature of the welding head. When the temperature changes due to current and voltage, the infrared camera 10 immediately feeds back to the PLC logic controller 3. When the system detects that the temperature changes too much, it sends a conversion signal to the digital control system in time and immediately executes the machine to adjust the power. Figure 5 shown.

[0065] c. The spectrometer 4 also starts working immediately when the printing work starts, and detects the lack of components in the molten pool in real time. When the elements in the molten pool reach the boiling point and evaporate, resulting in the lack of components in the molten pool, the spectrometer 4 immediately sends a signal to the PLC logic controller 3 after detecting it. The PLC logic controller 3 responds in time and issues a command to the wire feeder 6 where the component is missing, increasing the wire feed rate until the wire feed rate is increased for a time of t, thereby achieving the purpose of precise control of the components. Figure 6 shown.

[0066] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A multi-wire plasma beam additive manufacturing equipment, characterized in that: include: A plasma beam fuse unit (8), a universal rotating wire feeding unit (5) and a closed-loop detection and control unit; The plasma beam fuse unit (8) serves as a heat source to heat the wire material in the universal rotating wire feeding unit (5); The universal rotating wire feeding unit (5) comprises a multi-channel wire feeding module, and the wire feeding direction of the multi-channel wire feeding module can be adjusted; The closed-loop detection and control unit detects the working condition of each wire feeding passage in the multi-channel wire feeding module and the composition of the formed material, and adjusts the wire feeding rate of each wire feeding passage according to the detection condition.

2. The multi-wire plasma beam additive manufacturing equipment according to claim 1, characterized in that: The universal rotating wire feeding unit (5) further comprises a wire heating module (7), wherein the wire heating module (7) preheats the wire in the universal rotating wire feeding unit (5), and the preheated wire is heated by the plasma beam fuse unit (8).

3. The multi-wire plasma beam additive manufacturing equipment according to claim 1, characterized in that: It also includes a six-degree-of-freedom mechanical arm (2), and the universal rotating wire feeding unit (5) is installed on the six-degree-of-freedom mechanical arm (2); The multi-channel wire feeding module comprises a rotating disk and a plurality of wire feeding heads (6); the plurality of wire feeding heads (6) are embedded in slots on the rotating disk; the wire feeding heads (6) rotate around the slots to adjust their angles.

4. The multi-wire plasma beam additive manufacturing equipment according to claim 1, characterized in that: The closed-loop detection and control unit comprises a digital control module (1) and a real-time monitoring module, wherein the digital control module (1) provides a process path for the welding head when it is working, and adjusts the wire feeding speed and wire feeding angle of the universal rotating wire feeding unit (5); The real-time monitoring module monitors the process path and processing speed, monitors the working state of the universal rotating wire feeding unit (5), and monitors the composition of the formed material in real time, and feeds back the monitoring data to the digital control module (1).

5. The multi-wire plasma beam additive manufacturing equipment according to claim 4, characterized in that: The real-time monitoring module comprises a high-speed camera (9), an infrared camera (10) and a spectrometer (4); The high-speed camera (9) monitors the printing path and printing speed in real time, the infrared camera (10) monitors the temperature of the welding head and the molten pool, and judges whether the welding working path and the molten pool temperature are normal based on the real-time uploaded image and the temperature of the molten pool, and the spectrometer (4) is used to detect the lack of components.

6. The multi-wire plasma beam additive manufacturing equipment according to claim 1, characterized in that: The invention also comprises a PLC logic controller (3), wherein the PLC logic controller (3) receives signals from an infrared camera (10), a high-speed camera (9), a spectrometer (4) and an input device, performs logic processing on the input data according to a preloaded program, and generates an output decision, and the PLC logic controller (3) sends the processing result to an output device.

7. A control method for a multi-wire plasma beam additive manufacturing equipment, based on the multi-wire plasma beam additive manufacturing equipment according to any one of claims 1 to 6, characterized in that: include: Step S1: before the operation starts, the six-axis robot arm is instructed to perform simulated printing without producing filaments to verify the printing path; Step S2: When starting processing, adjust the position of the wire and the welding head to maintain 2-4 mm, and adjust the angle between the wire feeding mechanism and the welding head; Step S3: During the printing process, the wire feeding head (6) always maintains the forward wire feeding direction under the preset path, and at the same time, the wire heating module of the universal rotating wire feeding unit (5) heats the wire.

8. The control method of multi-wire plasma beam additive manufacturing equipment according to claim 7, characterized in that: In the step S1, when the high-speed camera (9) detects a path change, an error signal is transmitted to the PLC logic controller (3). After the PLC logic controller (3) detects the error path, it sends a digital signal to the digital numerical control system for adjustment.

9. The control method of multi-wire plasma beam additive manufacturing equipment according to claim 7, characterized in that: During the printing process, when the infrared camera (10) detects that the temperature at the welding head changes, the signal is fed back to the PLC logic controller (3); when the PLC logic controller (3) detects that the temperature changes too much, it sends a signal to the digital control system and executes the machine to adjust the power.

10. The control method of multi-wire plasma beam additive manufacturing equipment according to claim 7, characterized in that: During the printing process, when the spectrometer (4) detects a change in the composition of the molding material, a signal is sent to the PLC logic controller (3), and the PLC logic controller (3) sends a command to the wire feeding head (6) with abnormal composition to adjust the wire feeding rate.

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