CN209867363U - Resistance induction composite heating metal wire material additive manufacturing device - Google Patents

Abstract

The utility model relates to a resistance induction combined heating metal wire material vibration material disk device solves current metal wire material vibration material disk device and has the end cap in the course of working, between layer upon layer and the base plate between combine poor problem. The device includes send a machine, conductive nozzle, base plate, atmosphere protection device and power, send a machine, conductive nozzle and base plate to set gradually from top to bottom, and the positive pole and the conductive nozzle of power are connected, and the negative pole is connected with the base plate, and its special character lies in: the device also comprises an ultrahigh frequency induction heating device and a substrate heating device; the ultrahigh frequency induction heating device is a high frequency induction heating coil, and the high frequency induction heating coil is wound on the outer side of a wire at the lower end of the contact tube through a ceramic sleeve and is connected with a power supply; the contact temperature measuring element is arranged on the ceramic sleeve; the substrate heating device is arranged below the substrate and used for heating the substrate; the substrate is provided with a substrate temperature measuring element for measuring the temperature of the substrate.

Description

Resistance induction composite heating metal wire material additive manufacturing device

Technical Field

The utility model relates to a metal vibration material disk field, concretely relates to resistance induction composite heating metal wire material vibration material disk device.

Background

Additive Manufacturing (AM) is a technology for manufacturing a solid part by a layer-by-layer accumulation method according to a CAD/CAM design, and is a manufacturing method of material accumulation compared to a conventional material reduction manufacturing (machining) technology. The additive manufacturing technology is commonly called 3D printing technology, is an advanced manufacturing technology which is rapidly developed in nearly 30 years, has the advantages of rapid and free manufacturing of a three-dimensional structure, and is widely applied to new product development and single-piece small-batch manufacturing, wherein metal direct forming is a difficult point and hot spot technology in the additive manufacturing technology.

There are many traditional methods for direct metal forming, but each has advantages and disadvantages. The additive manufacturing technology using metal powder as a raw material has the disadvantages of expensive raw materials and explosion risk, and the processing cost is high due to the fact that the metal powder is harmful to human bodies in the processing process. The high-energy beam additive manufacturing technology has the main defects of high equipment manufacturing cost, complex equipment structure, larger equipment volume, radiation pollution, lower molding efficiency under the same power and the like. For example, the electron beam may accompany the emission of gamma rays during the deposition process, which may cause leakage of rays if the device is not designed properly, resulting in environmental pollution; also, laser sintering or laser melting techniques, for example, are not suitable for all metals, especially for metals with high laser reflectivity, and have poor forming efficiency. The disadvantage of the electric arc additive manufacturing technology is that a great deal of noise and arc pollution are generated, and the forming precision is poor. Other metal additive manufacturing methods also include direct metal inkjet 3D printing (research and development of prototype machines have been completed by an original enterprise XJet for israel 3D printing), and the method is limited by the proportion of special metal ink and has a narrow application range.

A metal wire additive manufacturing method based on resistance hot melting stacking molding is characterized in that joule heat generated by current flowing in a wire material is utilized to directly melt the metal wire, so that a metal additive manufacturing process is realized. The technology realizes that the electric energy is directly converted into the heat energy required by metal melting, the electric energy is directly utilized without intermediate conversion for multiple times, the additive manufacturing of metal parts with high utilization rate, high quality, low cost and environmental protection can be realized, and the method is a metal additive manufacturing method integrating materials, machinery, measurement and control technology and information processing. However, this method is currently used less frequently, one of the reasons being its poor stability, severe arcing splatter during printing, and poor bonding between layers and substrates.

There are presently disclosed metal wire additive manufacturing devices, such as the patent of U.S. digital alloy corporation, application number 201580075879.9. For example, chinese utility model application CN201611186726.4, a resistance electromagnetic induction composite heating metal wire forming method, the basic structure of which is shown in fig. 1, includes a metal wire 1, a pulsating wire feeding mechanism 2, a shielding gas 3, a gas protecting cover 4, an electromagnetic induction power supply 5, an electromagnetic induction coil 6, a contact nozzle 7, a three-dimensional motion control system 8, a power supply 9, a deposition forming part 10, and a substrate 11; when the metal wire is fused and formed, protective gas is conveyed to the front end of the metal wire through a nozzle to prevent the metal wire from being oxidized in the fusion and accumulation process, and the metal wire additive manufacturing device only describes a method for manufacturing the resistance thermal additive, but has the following problems:

1. in the additive manufacturing process of the metal micro-wire formed by resistance hot melting and stacking, when the conductive nozzle drives the wire to move, arcing and splashing are easy to occur in the contact process of the wire and the conductive substrate, so that the problems of poor forming effect, unstable printing, difficulty in controlling a system and the like are caused;

2. the wire materials are softened in the heating process, and the contact tip is contacted with the wire materials to conduct electricity, so that serious problems of incapability of smooth delivery, blockage and the like are caused in the wire feeding process;

3. because remelting is difficult to achieve, the first layer of molten metal liquid drops at high temperature can form spheres when contacting the low-temperature substrate, and spherical metal particles cannot be effectively attracted, and can be pushed to the second layer to the Nth layer in the same way, so that poor layer-by-layer combination is caused, and even forming cannot be performed, the metallurgical structure can be formed between the substrate and the molten metal liquid drops only by high temperature (close to the melting point of metal) according to the metal material theory, and the whole substrate is unrealistic when being heated to the high temperature, the biggest problem of the scheme is that the resistance hot melting can only melt the metal wire material, but cannot be effectively combined with a matrix, so that forming defects and even failure are caused;

4. the theory of material wetting in materials science shows that effective infiltration can be realized only when a substrate or a next layer of matrix is heated to be close to a metal melting point, the substrate is heated to be high temperature, the first step needs large energy, and the second substrate can generate deformation, instability, flow and collapse phenomena at the high temperature, and the heating is not practical only by the substrate;

5. the uneven temperature field of the existing printed article can cause warping, deformation and cracking, thus causing printing defects;

6. the local atmosphere protection can not realize good atmosphere protection, and the metal oxidation phenomenon still exists when the airflow is small; when the air flow is large, the technological process is influenced, the air flow can blow away metal liquid drops, forming defects are caused, and other uncooled printing areas cannot be effectively protected.

SUMMERY OF THE UTILITY MODEL

In order to solve present metal silk material vibration material disk manufacturing device in the course of working exist the end cap, layer upon layer between and with the base plate between combine poor problem, the utility model provides a resistance induction composite heating metal silk material vibration material disk manufacturing device.

The technical solution of the utility model is as follows:

the utility model provides a resistance induction composite heating metal silk material vibration material disk manufacturing installation, includes send a machine, conductive nozzle, base plate, atmosphere protection device and power, send a machine, conductive nozzle and base plate to set gradually from top to bottom, the positive pole and the conductive nozzle of power are connected, and the negative pole is connected with the base plate, and its special character lies in: the device also comprises an ultrahigh frequency induction heating device and a substrate heating device; the ultrahigh frequency induction heating device is a high frequency induction heating coil, and the high frequency induction heating coil is wound on the outer side of a wire at the lower end of the contact tube through a ceramic sleeve and is connected with a power supply; the ultrahigh frequency induction heating device is provided with a contact temperature measuring element, and the contact temperature measuring element is arranged on the ceramic sleeve; the substrate heating device is arranged below the substrate and used for heating the substrate; and a substrate temperature measuring element is arranged on the substrate and used for measuring the temperature of the substrate. The ultrahigh frequency induction heating coil is fixed on the wire feeder, and can realize non-contact heating, ensure smooth movement of the moving platform, and has high heating efficiency and suitability for all metals.

Further, the high-frequency induction heating coil is a hollow copper pipe, and a cooling medium is introduced into the hollow copper pipe.

Further, the device also comprises a parallel resistor R1, wherein one end of the parallel resistor R1 is connected with the contact tip, and the other end of the parallel resistor R1 is connected with the substrate. The resistance value of the parallel resistor R1 is larger than the contact resistance when the metal wire is communicated with the substrate and smaller than the breakdown resistance of the gas between the contact tip and the substrate, so that the shunted current can be ignored during normal printing, the heat loss of the system is basically not added,

further, one end of the parallel resistor R1 is connected with the contact tip through a wire nose.

Further, the power supply is a programmable power supply, and the programmable power supply has a constant current output mode and a constant voltage output mode, wherein the constant current output mode is used for melting metal, and the constant voltage output mode is used for supplying power to the parallel resistor R1.

Furthermore, in order to prevent the oxidation of the metal wire and ensure that the protective gas does not influence the metal forming, the atmosphere protection structure comprises an airtight box body and an inert gas tank communicated with the airtight box body, a gas intake and exhaust pump is arranged on a pipeline communicated with the airtight box body and the inert gas tank, a water oxygen content detection sensor is arranged on the airtight box body, and the gas intake and exhaust of the inert gas are controlled by a sensor closed loop; the airtight box body forms atmosphere protection for a metal wire melting forming area.

Further, the ceramic bushing is made of boron nitride or silicon nitride.

Further, the substrate moves through a three-dimensional motion platform, and a radiator is arranged on the three-dimensional motion platform.

Compared with the prior art, the utility model, beneficial effect is:

1. the utility model discloses a waiting to print the regional top and setting up hyperfrequency induction heating device in the contact nozzle lower part, realizing the regional non-contact high-efficient heating of shaping, improving the associativity of metal liquid drop and base plate, being favorable to the combination between layer and layer, between layer and the base plate, realizing high-quality metal 3D shaping.

2. The utility model discloses a hyperfrequency induction heating device, high frequency induction heating device has realized the local quick non-contact heating of metal, by the strong magnetic field that produces polarity instantaneous change in the hyperfrequency induction coil, it is close to high frequency coil to treat the printing region, the silk material passes through in the high frequency coil, the magnetic beam will link up whole waiting to print the region, inside and the opposite direction of induction heating electric current at the induction heating object, produce corresponding strong eddy current, because there is resistance in induction heating's the metal, produce strong vortex heat energy, make induction heating object temperature rise rapidly, extremely thin zone of heating, generally be 0.1-0.5 mm. Therefore, the ultrahigh frequency induction heating device has the advantages of non-contact efficient heating, high heating efficiency and the like.

3. The utility model discloses in the device, metal silk material and high frequency induction heating coil contact lead to the short circuit phenomenon, have violent temperature gradient between induction coil and molten metal simultaneously to direct and molten metal contact, so adopt ceramic bushing to carry out silk material guide and insulation, this ceramic bushing possesses not separation magnetic field, thermal shock resistance is good, simultaneously with characteristics such as metal liquid drop incompatibility. The ceramic sleeve can allow a high-frequency magnetic field to well pass through, and has the advantages of being not easy to block due to the characteristics of incompatibility with metal liquid drops and the like. Meanwhile, the temperature measuring device is additionally arranged on the wall of the sleeve, the problem of non-contact temperature measurement in the metal 3D printing process is solved, contact temperature measurement is simply and conveniently realized, temperature measurement is more accurate, the surface temperature of molten metal is estimated according to a heat conduction equation, closed-loop temperature accurate control in metal 3D is realized by controlling a resistance welding power supply, a high-frequency induction power supply and a substrate temperature control power supply, high-quality metal 3D forming is facilitated, and boron nitride and silicon nitride are preferably adopted for the ceramic sleeve.

4. The utility model discloses a parallel resistance between contact tip and base plate, when certain external cause leads to silk material and base plate separation, because parallel resistance has made the route for the electric current to eliminated the electric arc and the electric spark phenomenon of the just tip of contact wire, avoided the material acutely to melt and splash the printing failure or big defect that lead to.

5. The utility model discloses a bottom heater at the base plate heats the base plate, makes the printing region realize the constant temperature environment, can reduce the warpage and the deformation of printing article, improves the shaping quality.

6. The utility model discloses a set up airtight box and include into, aspiration pump and water oxygen content detection sensor in the periphery of printing the region, the case is furnished with the inert gas jar outward, and it is reliable to have a simple structure, and atmosphere environmental monitoring is accurate, and atmospheric pressure is stable, protect effectual advantage.

Drawings

FIG. 1 is a diagram of a conventional forming apparatus for resistance electromagnetic induction composite heating of metal wire;

reference numerals: 1-metal wire, 2-pulse wire feeding system, 3-protective gas, 4-gas protective cover, 5-electromagnetic induction power supply, 6-electromagnetic induction coil, 7-conductive nozzle, 8-three-dimensional motion control system, 9-programmable power supply, 10-deposition forming part, 11-substrate;

FIG. 2 is a diagram of the material-increase manufacturing device for resistance induction composite heating metal wire material of the present invention;

fig. 3 is a structural diagram of the ultrahigh frequency induction heating device of the present invention;

fig. 4 is a sectional view of the ultrahigh frequency induction heating device of the present invention;

FIG. 5 is a schematic diagram of the atmosphere protecting box of the present invention;

FIG. 6 is a schematic view of the manufacturing process of the metal wire additive.

Reference numerals: 21-wire feeder, 22-contact nozzle, 23-substrate, 24-atmosphere protection device, 25-ultrahigh frequency induction heating device, 26-wire, 27-wire nose, 28-ceramic sleeve, 29-substrate heating device, 30-contact temperature measuring element, 31-radiator, 32-three-dimensional motion platform, 241-airtight box body and 242-air pump.

Detailed Description

As shown in fig. 2, the resistance induction composite heating metal wire material additive manufacturing device comprises a wire feeder 21, a conductive nozzle 22, a substrate 23, an atmosphere protection device 24 and a power supply, wherein the wire feeder 21, the conductive nozzle 22 and the substrate 23 are sequentially arranged from top to bottom, the positive electrode of the power supply is connected with the conductive nozzle 22, the negative electrode of the power supply is connected with the substrate 23, and the resistance induction composite heating metal wire material additive manufacturing device further comprises a parallel resistor R1, an ultrahigh frequency induction heating device 25 and a substrate heating device 29.

One end of the parallel resistor R1 is connected with the contact tip 22, the other end is connected with the substrate 23, and one end of the parallel resistor R1 is connected with the contact tip 22 through the wire nose 27. For the connection of large current and large diameter wires, the wire nose 27 is generally used for better contact and reduction of contact resistance. When a parallel resistor of a proper specification is connected in parallel at the contact tip 22 and the substrate 23, and the metal wire 26 is separated from the substrate 23 due to some external reason, a path is made for current due to the parallel resistor, and an arcing phenomenon does not occur. The parallel resistor type selection principle is far larger than the contact resistance when the metal wire material 26 is conducted (the contact resistance when the metal wire material 26 is conducted with the substrate 23), therefore, during normal printing, the shunted current can be small to be ignored, the system heat loss is basically not added, the resistance value of the parallel resistor is smaller than the breakdown resistance of microspur protective gas (the gas breakdown resistance between the conductive nozzle 22 and the substrate 23), the parallel resistor plays a role of guiding when the metal wire material 26 is separated from the substrate 23, and meanwhile, the parallel resistor is matched with power supply control and automatically changed from constant current to voltage source control, the minimum power output power is ensured, the circuit loss is further reduced, and the specific and proper size and power of the parallel resistor need to be selected according to different printing metal wire materials 26.

The specific structure of the printing head of the present invention is shown in fig. 3 and 4, the ultra-high frequency induction heating device 25 includes a high-frequency induction heating coil, which is disposed on a metal wire 26 at the lower end of the contact nozzle 22 through a ceramic sleeve 28 and is connected to a power supply; the high-frequency induction heating coil can be hollow copper tube, and cooling medium is introduced into the hollow copper tube. The contact nozzle 22 connects resistance welding current to the contact nozzle 22 through a wire nose 27, a wire feeder 21 sends metal wires 26 into the contact nozzle 22, the metal wires are continuously sent into a high-frequency induction heating coil, the high-frequency induction heating coil is connected with high-frequency current, different structures can be designed according to the magnitude of the current, if the current is overlarge, cooling water is connected for protection, a strong magnetic field can be generated due to the large current, and meanwhile, due to the existence of the resistor, the heat of the resistor needs to be taken away by circulating cold water and a water cooler needs to be equipped; if the current is low, the current is not needed, a high-temperature wire can be adopted, or air cooling can be adopted.

The short circuit phenomenon is caused by the contact of the metal wire 26 with the high frequency induction heating coil, so that it is necessary to use the ceramic bushing 28 for conducting and insulating the metal wire 26, the ceramic bushing 28 allows the high frequency magnetic field to pass well, and there is a sharp temperature gradient between the induction coil and the molten metal and directly contacts the molten metal. The sleeve has the characteristics of no magnetic field obstruction, good thermal shock resistance, incompatibility with metal liquid drops and the like, so the sleeve has the advantages of difficult plug and the like. Meanwhile, the temperature sensor is arranged on the wall of the sleeve, the problem of non-contact temperature measurement in the metal 3D printing process is solved, contact temperature measurement is simply and conveniently achieved, the surface temperature of molten metal is estimated according to a heat conduction equation, metal 3D printing closed-loop temperature control is achieved by controlling the resistance welding power supply, the high-frequency induction power supply and the substrate 23 temperature control power supply, and high-quality metal 3D forming is facilitated.

The substrate heating device 29 is provided on the substrate 23 to heat the substrate 23. The substrate 23 is provided with a temperature measuring element for measuring the temperature of the substrate 23. The temperature control power supply part of the substrate 23 enables a printing area to realize a constant temperature environment, can reduce the warping and deformation of a printed article caused by stress, and improves the forming quality. The substrate temperature control system can adopt various heating and temperature control modes, such as resistance heating or induction heating, and the like, and a temperature sensor is required to be added to realize PID temperature control, different temperatures can be set according to different heat treatment processes of different metal materials, if the temperature required by the substrate is not high, a radiator can not be added, or the substrate is required to be cooled and directly cooled to realize the substrate constant temperature environment.

In order to reduce circuit loss and ensure constant output power of the power supply, the power supply is a programmable power supply which has a constant-current output mode and a constant-voltage output mode, the constant-current output mode is used for melting metal, and the constant-voltage output mode is used for supplying power to the parallel resistor R1. In the utility model, the required current ratio is large when the metal is melted, and if the current when the metal is melted is used for supplying power to the parallel resistor R1, great power is wasted; parallel resistance R1 only plays the effect of water conservancy diversion, consequently, the utility model discloses in chooseed programmable power supply for the power supply of parallel resistance R1 under the constant voltage output mode for use, be the constant voltage output mode through software current-limiting automatic adjustment at present, set up maximum current and maximum voltage in the software, according to load condition automatic switch-over.

The resistance induction composite heating metal wire 26 additive manufacturing control system comprises six parts, namely an ultrahigh frequency power supply control part, a resistance welding control power supply part, a substrate temperature control power supply part, a three-dimensional motion control part, a wire feeding control part and a protective atmosphere box body control part. The ultrahigh frequency power supply control part, the resistance welding control power supply part and the substrate temperature control power supply part can also be combined into an integrated power supply control, and the protective atmosphere box body control part comprises a water oxygen detection sensor, a pressure detection sensor and an air pump control.

The resistance welding control power supply part provides electric energy for melting metal wires, the direct current alternating current or pulse mode can be adopted mainly according to the melting forming process characteristics of different metal materials, the voltage source or current source mode can also be adopted, joule hot melting metal wire materials 26 generated instantly by metal wire short circuit are used, the short circuit current resistance is generally selected from 1A-1000A according to different metal wire materials 26 and different forming efficiencies, the resistance is in violent nonlinear change when the metal wires are melted, and the tracking and matching of power to loads are realized through the power closed loop of the power supply.

The ultrahigh frequency power supply part realizes local rapid non-contact heating of metal, a strong magnetic field with instantly changed polarity is generated in the ultrahigh frequency induction coil, the area to be printed is close to the high frequency coil, metal wires pass through the high frequency coil, and magnetic beams penetrate through the whole area to be printed. In the inside of the induction heating object, a strong eddy current is generated in a direction opposite to the induction heating current. Because the metal heated by induction has resistance, so it can produce strong eddy heat energy to make the object heated by induction quickly rise in temperature, and the heating layer is very thin, generally 0.1-0.5 mm. And non-contact temperature measuring equipment such as an infrared thermometer or an infrared imager and the like can form closed-loop control ultrahigh-frequency power supply power output, so that local temperature control of a printing area is realized. The temperature control can realize non-contact efficient heating of a forming area, the problem that the combination of metal liquid drops and a substrate is difficult to realize by resistance welding heating is solved, the mutual soluble combination between layers and the substrate is realized efficiently, and the high-quality metal 3D forming is realized.

The three-dimensional motion control part can be realized by constructing a motion control platform or a mechanical arm by using a motor module.

As shown in fig. 5, the box control part can be designed to protect atmosphere according to different metal materials, and includes a gas purification system, a circulation system and a gas temperature control system, and needs to control the inlet and outlet of a water oxygen sensor, a pressure sensor, a temperature sensor, a gas tank, a gas pump and a gas valve, and can also be designed according to a vacuum closed cavity and needs to be equipped with a vacuum pump. The atmosphere protection device 24 may specifically include an airtight box 241, and an inert gas tank communicated with the airtight box 241, wherein a suction pump 242 is disposed on a pipeline of the airtight box 241 communicated with the inert gas tank, and a water oxygen content detection sensor is disposed on the airtight box 241. Different metal materials can be designed to have different atmosphere protection, various gas purity sensors can contain sensors such as water oxygen content and gas pressure according to different requirements, closed-loop control of gas quality, gas pressure and the like is achieved, and a vacuum pump can be equipped according to the design of a vacuum sealed cavity. The wire feeding speed and the moving speed need to be matched with the technological parameters.

The energy input part, namely the power supply control part, the space motion control part, the printing head and wire feeding control part and the box body air pump control part are all required to be connected to a printer and a general control system, and are uniformly coordinated and controlled according to the process characteristics of different metal materials.

The utility model discloses a motion sets up in the base plate bottom, considers that motion platform can't bear the high temperature for a long time, leads to the misalignment nature of deformation and motion, has set up radiator 31 on motion platform, and radiator 31 can be according to not selecting forced air cooling, water-cooling, semiconductor refrigeration and so on through the condition.

The principle of the utility model is that resistance heat is generated after the metal wire is electrified, the metal wire melting and stacking molding is realized through the resistance heat, the metal wire is sent into the contact tip 22 through the automatic wire feeder 21, the contact tip 22 is connected with the anode of the resistance welding power supply, the metal substrate 23 is connected with the cathode of the power supply resistance welding power supply, a loop is formed on the top end of the metal wire and the substrate 23, the current in a certain form is led to, the metal wire end is instantly melted, the melted metal liquid drop is deposited on the substrate 23 due to the action of gravity and surface tension, a high-frequency induction coil is arranged between the contact tip 22 and the substrate 23, a strong magnetic field with the polarity instantly changed is generated between the melted metal liquid drop and the substrate 23 by the ultrahigh frequency induction power supply, the eddy heat generated in the area enables the metal liquid drop and the substrate 23 to realize the metallurgical combination, the metal wire 26 is continuously delivered along with the movement of the substrate, and realizing metal additive manufacturing. However, during the printing process, the resistivity of the metal filament changes with the temperature, and the material of the metal filament 26 may have impurities or deform to cause instability during the wire feeding process, etc., so that the conductive metal filament 26 does not contact the substrate 23, and the phenomena of electric arc and electric spark occur to cause the deposited material to be violently melted and splashed, thereby causing printing failure or large defects. Therefore, the utility model discloses connect in parallel the parallel resistance of suitable specification in contact tip 22 and base plate 23 department, when certain external cause leads to the separation of wire material 26 and base plate 23, the parallel resistance makes the route for the electric current, avoids taking place the phenomenon of arcing.

As shown in fig. 6, the printing process of the metal wire additive manufacturing apparatus of the present invention is as follows:

1. according to the requirement of the formed part, the property of the formed material and various forming process parameters are determined, and the surface of the metal wire material 26 is ensured to be free of oxides and to be dried.

2. The atmosphere protection structure is used to realize a protective atmosphere or a vacuum environment, and a metal wire 26 is fed into the contact tip 22 through the wire feeder 21 mechanism and is kept in contact with the substrate 23.

3. And starting the printer according to preset parameters, and realizing layer-by-layer accumulation and accumulation molding of metal materials and additive manufacturing of metal parts under the cooperative work of the movement mechanism, the substrate 23 temperature control power supply, the resistance welding power supply, the high-frequency induction heating power supply and the wire feeder 21.

Claims (8)

1. The utility model provides a resistance induction composite heating metal silk material vibration material disk manufacturing installation, includes send a machine (21), contact tip (22), base plate (23), atmosphere protection device (24) and power, send a machine (21), contact tip (22) and base plate (23) to set gradually from top to bottom, the positive pole and the contact tip (22) of power are connected, and the negative pole is connected its characterized in that with base plate (23):

the device also comprises an ultrahigh frequency induction heating device (25) and a substrate heating device (29);

the ultrahigh frequency induction heating device (25) is a high frequency induction heating coil, and the high frequency induction heating coil is wound on the outer side of a metal wire (26) at the lower end of the contact tube (22) through a ceramic sleeve (28) and is connected with a power supply; a contact temperature measuring element (30) is arranged on the ceramic sleeve (28);

the substrate heating device (29) is arranged below the substrate (23) and used for heating the substrate (23); and a substrate temperature measuring element is arranged on the substrate (23) and is used for measuring the temperature of the substrate (23).

2. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 1, wherein: the high-frequency induction heating coil is a hollow copper pipe, and a cooling medium is introduced into the hollow copper pipe.

3. The resistance induction composite heating metal wire material additive manufacturing apparatus according to claim 1 or 2, wherein: the device is characterized by further comprising a parallel resistor R1, one end of the parallel resistor R1 is connected with the contact nozzle (22), the other end of the parallel resistor R1 is connected with the substrate (23), and the resistance value of the parallel resistor R1 is larger than the contact resistance of the metal wire material (26) and the substrate (23) when the metal wire material is conducted, and is smaller than the breakdown resistance of gas between the contact nozzle (22) and the substrate (23).

4. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 3, wherein: one end of the parallel resistor R1 is connected with the contact tip (22) through a wire nose (27).

5. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 4, wherein: the power supply is a programmable power supply, and the programmable power supply has a constant current output mode and a constant voltage output mode, wherein the constant current output mode is used for melting metal, and the constant voltage output mode is used for supplying power to the parallel resistor R1.

6. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 5, wherein: the atmosphere protection device (24) comprises an airtight box body (241) and an inert gas tank communicated with the airtight box body (241), wherein a suction pump (242) is arranged on a pipeline of the airtight box body (241) communicated with the inert gas tank, and a water and oxygen content detection sensor is arranged on the airtight box body (241).

7. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 6, wherein: the ceramic bushing (28) is made of boron nitride or silicon nitride.

8. The resistive induction composite heating metal wire additive manufacturing apparatus of claim 7, wherein: the substrate (23) moves through a three-dimensional motion platform (32), and a radiator (31) is arranged on the three-dimensional motion platform (32).