Apparatus and Method for Preparing Magnesium Alloy Wire for Arc Additive Manufacturing by Pulse Current-Assisted Roller Die Hot Drawing

Abstract

This invention relates to an apparatus and method for preparing magnesium alloy wire for arc additive manufacturing by pulsed current-assisted hot drawing with a roller die, belonging to the field of magnesium alloy wire preparation technology. The apparatus includes a pay-off frame, a straightener, a tubular heating furnace, a pulse power supply, a roller die, and a drawing machine. The roller die includes a roller die frame and roller sets. The roller die frame includes an elliptical roller die frame and a circular roller die frame. The elliptical roller die frame contains an elliptical roller set, and the circular roller die frame contains a circular roller set. The rollers of the elliptical and circular roller sets are fixed to the elliptical and circular roller die frames by high-temperature resistant ceramic bearings. This method uses a pulsed current to connect the electrodes to the rollers and the pulse power supply, transmitting the pulsed current to the wire through the rollers. Furthermore, the rollers and wire maintain close contact at all times, avoiding or even eliminating the adverse effects of friction and arcing between the electrodes and wire on the surface quality of the wire during conventional electroplastic drawing.

Description

Technical Field

[0001] This invention relates to the field of pulse current assisted roller die hot drawing technology, specifically to an apparatus and method for preparing magnesium alloy wire for arc additive manufacturing by pulse current assisted roller die hot drawing. Background Technology

[0002] Arc additive manufacturing is a moldless, near-net-shape forming technology that enables rapid prototyping of large and complex components. Magnesium alloys, with their low density, offer significant advantages in lightweight components. Arc additive manufacturing of magnesium alloys combines these advantages, making it a promising technology for applications in aerospace and transportation. Rare-earth magnesium alloys, in particular, possess excellent high-temperature oxidation resistance and high-temperature mechanical properties, along with high strength, good creep resistance, and good corrosion resistance. However, the diameter of the wire used in arc additive manufacturing is typically 1.2 mm. Extrusion, drawing, and intermediate annealing are conventional methods for processing magnesium alloy wires. The principle involves using external force to flow the magnesium alloy in a mold and form the desired cross-sectional shape, while appropriate heat treatment eliminates the workpiece's deformation strengthening effect, improves its plastic deformation capacity, and facilitates subsequent drawing processes. However, magnesium alloys have a close-packed hexagonal crystal structure, resulting in a limited number of sliding systems activated at room temperature. Furthermore, the alloying of rare-earth elements significantly increases the alloy's deformation resistance, leading to problems such as small deformation, low deformation rate, and frequent wire breakage during room temperature drawing of rare-earth magnesium alloys.

[0003] Electrically assisted drawing is a novel method for processing metal wires. By applying pulsed current during the drawing process, the electroplastic effect is utilized to reduce the deformation resistance and residual stress of the metal, thereby improving its ductility and mechanical properties. This process can effectively solve the processing problems of some difficult-to-deform metal materials, improving the quality and efficiency of drawn products. However, during pulsed current assisted drawing, friction occurs between the magnesium alloy wire and the electrode. As the friction increases, poor contact occurs, easily leading to sparking. Although using rolling electrodes can improve these problems, it also increases the electrode spacing and introduces instability due to point contact between the electrode and the wire. Therefore, there is an urgent need to develop rare-earth magnesium alloy wire preparation technology with large deformation and high deformation rate to support the increasing demand for rare-earth magnesium alloy components manufactured by arc additive manufacturing. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for preparing magnesium alloy wires for arc additive manufacturing using pulsed current-assisted roller die hot drawing. This apparatus combines hot deformation, electroplastic processing, and roller die drawing of rare earth magnesium alloys to achieve high-efficiency preparation of rare earth magnesium alloy wires for arc additive manufacturing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An apparatus for preparing rare earth magnesium alloy wire for arc additive manufacturing by pulsed current-assisted hot drawing with a roller die includes a wire feeding frame, a straightener, a tubular heating furnace, a pulse power supply, a roller die, and a wire drawing machine. The roller die includes a roller die frame and a roller assembly. The roller die frame includes an elliptical roller die frame and a circular roller die frame. The elliptical roller die frame contains an elliptical roller assembly, and the circular roller die frame contains a circular roller assembly. The rollers of the elliptical and circular roller assemblies are fixed by high-temperature resistant ceramic bearings. The elliptical roller mold frame and the circular roller mold frame are provided with inlet guide holes and outlet guide holes for insulation treatment. A perforated insulating plate is set between the outer shell of the elliptical roller mold frame and the circular roller mold frame. The rare earth magnesium alloy wire blank enters the elliptical roller assembly in the elliptical roller mold frame through the inlet guide hole, and then exits through the outlet guide hole through the circular roller assembly in the circular roller mold frame via the perforated insulating plate, and is finally wound onto the drum of the wire drawing machine.

[0007] Furthermore, the pulse power supply is connected to the rollers of the elliptical roller group and the circular roller group through the pulse current connection electrode and the wire, and the pulse current is sequentially conducted to the rollers and the rare earth magnesium alloy wire to provide pulse current for the wire drawing deformation process. At the same time, the pulse current connection electrode is reliably insulated from the roller mold frame.

[0008] Furthermore, the tubular heating furnace is protected by argon gas.

[0009] A method for preparing rare earth magnesium alloy wire for arc additive manufacturing by pulsed current-assisted hot drawing with a roller die includes the following steps:

[0010] Step 1: Place the rare earth magnesium alloy wire blank on the wire feeding frame. One end of the rare earth magnesium alloy wire blank passes through the straightener, tubular heating furnace, wire inlet guide hole, elliptical roller group, perforated insulating plate, round roller group, and wire outlet guide hole, and is fixed on the drum of the wire drawing machine.

[0011] Step 2: Set the pulse power supply parameters;

[0012] Step 3: Connect the power supply to the tubular heating furnace and start heating;

[0013] Step 4: Set the wire drawing speed of the wire drawing machine. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0014] Step 5: After drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter, finally obtaining a rare earth magnesium alloy wire for arc additive manufacturing with a diameter of 1.2 mm.

[0015] Furthermore, in step 1, the rare earth magnesium alloy wire undergoes deformation of 15% to 30% after passing through the elliptical roller group and the circular roller group.

[0016] Furthermore, in step 2, the pulse current is set to 50~200A, the pulse frequency to 200~800Hz, and the duty cycle to 10%~90%.

[0017] Furthermore, in step 3, the furnace temperature is set to 200~400℃.

[0018] Furthermore, in step 4, the wire drawing speed of the wire drawing machine is 5~20m / min.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. Addressing the issues of high deformation resistance and low wire drawing efficiency in rare earth magnesium alloys, this patented technology integrates the advantages of hot drawing, electroplasticization, and roll drawing. Specifically, the deformation resistance of rare earth magnesium alloys decreases at high temperatures, facilitating dynamic recrystallization and eliminating internal stress and defects generated during drawing deformation, thereby increasing the deformation amount and rate per pass. During deformation, pulsed current reduces the deformation resistance and improves the plastic deformation capacity of rare earth magnesium alloys. Roll drawing transforms the sliding friction in the traditional drawing process into rolling friction, significantly reducing the drawing force under the same deformation conditions, effectively preventing wire breakage. This leads to the development of a highly efficient preparation technology for rare earth magnesium alloy wires, resulting in a significant improvement in both the deformation amount and drawing rate per pass.

[0021] 2. This patented technology uses a pulsed current to connect the electrode to the roller and the pulsed power supply. The pulsed current is transmitted to the wire through the roller, and the roller and the wire always maintain close contact, avoiding or even eliminating the adverse effects of friction and arcing between the electrode and the wire on the surface quality of the wire during conventional electroplastic drawing.

[0022] 3. This patented technology uses high-temperature resistant ceramic bearings to fix the rollers, which bear the thermal and mechanical loads during the hot drawing process to ensure the service life of the roller mold; at the same time, the electrical insulation of the ceramic bearings is used to maintain reliable insulation between the rollers and the roller mold frame, so that the pulse current is transmitted to the rare earth magnesium alloy wire, which plays a role in electroplasticization.

[0023] 4. In this patented technology, the rollers and wires in the roller drawing process are subjected to rolling friction, which eliminates the need for lubricants to reduce the drawing force. This also avoids surface contamination of the wires and the introduction of impurities into the additive manufacturing alloys.

[0024] In summary, this patented technology provides reliable technical support for the efficient preparation of high-quality rare earth magnesium alloy wires for arc additive manufacturing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0026] Figure 2 This is a detailed structural diagram of the roller mold of the present invention;

[0027] Figure 3 The scanning electron microscope (SEM) morphology of a 6mm diameter rare earth magnesium alloy blank prepared in Example 2;

[0028] Figure 4 The metallographic morphology of the 1.2 mm diameter rare earth magnesium alloy wire prepared in Example 2 is shown.

[0029] Figure 5 The scanning electron microscope (SEM) morphology of the 1.2 mm diameter rare earth magnesium alloy wire prepared in Example 2 is shown.

[0030] Figure 6 The tensile stress-strain curve of the 1.2 mm diameter rare earth magnesium alloy wire prepared in Example 2 is shown.

[0031] In the diagram, 1: wire feeding frame, 2: straightener, 3: tubular heating furnace, 4: pulse power supply, 5: roller die, 6: wire drawing machine, 7: pulse current connecting electrode, 8: inlet guide hole, 9: elliptical roller die frame, 10: elliptical roller wheel assembly, 11: wire, 12: high temperature resistant ceramic bearing, 13: round roller wheel assembly, 14: round roller die frame, 15: rare earth magnesium alloy wire blank, 16: outlet guide hole, 17: perforated insulation board. Detailed Implementation

[0032] This invention will be described in detail with reference to the accompanying drawings and embodiments to better illustrate the objectives, methods, and advantages involved in the invention. It should be noted that these specific embodiments are merely illustrative and do not constitute any limitation on the invention. Example 1

[0033] This embodiment provides an apparatus for preparing rare earth magnesium alloy wire for arc additive manufacturing by pulsed current-assisted roller die hot drawing, such as... Figure 1 As shown, the system includes a wire feeding frame 1, a straightener 2, a tubular heating furnace 3, a pulse power supply 4, a roller die 5, and a wire drawing machine 6. The straightener 2 is used to straighten the rare earth magnesium alloy wire, preventing the wire from contacting the furnace wall of the tubular heating furnace 3 and ensuring a uniform temperature distribution of the wire. The tubular heating furnace 3 is protected by argon gas to prevent surface oxidation of the rare earth magnesium alloy wire at high temperatures.

[0034] Among them, such as Figure 2As shown, the roller mold 5 includes a roller mold frame and roller sets. The roller mold frame includes an elliptical roller mold frame 9 and a circular roller mold frame 14. The elliptical roller mold frame 9 contains an elliptical roller set 10, and the circular roller mold frame 14 contains a circular roller set 13. The rollers of the elliptical roller set 10 and the circular roller set 13 are fixed to the roller mold frame (elliptical roller mold frame 9 and circular roller mold frame 14) by high-temperature resistant ceramic bearings 12. During the hot drawing process, the high-temperature resistant ceramic bearings 12 withstand high temperature and pressure to ensure the normal rotation of the rollers. At the same time, the high-temperature resistant ceramic bearings 12 ensure reliable insulation between the rollers and the roller mold frame. The elliptical roller mold frame 9 and the circular roller mold frame 14 are provided with insulated inlet guide holes 8 and outlet guide holes 16, which match the corresponding roller sets. At the same time, a perforated insulating plate 17 is provided between the outer shells of the elliptical roller mold frame 9 and the circular roller mold frame 14. Rare earth magnesium alloy wire blank 15 enters the elliptical roller group 10 in the elliptical roller mold frame 9 through the inlet guide hole 8, and then exits through the outlet guide hole 16 through the elliptical roller group 13 in the round roller mold frame 14 via the perforated insulating plate 17, and finally is wound onto the drum of the wire drawing machine 6.

[0035] The pulse power supply 4 is connected to the rollers of the elliptical roller group 10 and the circular roller group 13 through the pulse current connection electrode 7 and the wire 11, and conducts the pulse current to the rollers and the rare earth magnesium alloy wire in sequence, providing pulse current for the wire drawing deformation process. At the same time, the pulse current connection electrode 7 is reliably insulated from the roller mold frame.

[0036] In the above-mentioned device, the straightener 2, the tubular heating furnace 3, the roller group, the inlet guide hole, the outlet guide hole and the wire drawing machine are at the same horizontal height, so that the rare earth magnesium alloy wire is kept at the same horizontal height when passing through the above-mentioned device during the drawing process. Example 2

[0037] This embodiment provides a method for producing Mg-8Gd-3Y-2Zn-0.5Zr alloy using the apparatus of Example 1, including the following steps:

[0038] Step 1: Using Φ6mm Mg-8Gd-3Y-2Zn-0.5Zr alloy rods obtained by extrusion as raw materials, the rods are placed on a wire feeding frame. One end of the rod passes through a straightener, a tubular heating furnace, an inlet guide hole, an elliptical roller group, a perforated insulating plate, a round roller group, and an outlet guide hole, and is fixed on the drum of the wire drawing machine. After the wire passes through the elliptical roller group and the round roller group, the deformation reaches 20%.

[0039] Step 2: Set the pulse power supply parameters: pulse current 100A, pulse frequency 400Hz, duty cycle 70%;

[0040] Step 3: Connect the power supply to the tubular heating furnace, set the furnace temperature to 300℃, and start heating;

[0041] Step 4: Set the wire drawing speed of the wire drawing machine to 10m / min. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0042] Step 5: After the drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter. After 15 drawing passes, a rare earth magnesium alloy wire with a diameter of 1.2 mm for arc additive manufacturing is obtained.

[0043] The metallographic morphology, scanning electron microscopy morphology, and tensile stress-strain curve of the 1.2 mm diameter rare earth magnesium alloy wire prepared in this embodiment are shown below. Figure 4 , 5 As shown in Figure 6, this patented technology enables the preparation of rare earth magnesium alloy wires for arc additive manufacturing with large strain (20% deformation per pass) and high drawing speed (10 m / min), thus improving the wire preparation efficiency compared to conventional drawing and roll drawing techniques. After drawing deformation, the morphology of the second phase changes from the initial ( Figure 3 The network structure transforms into the final fibrous and granular structure. Figure 4 , 5 The grain size was refined from an initial 20 μm to approximately 2 μm; simultaneously, the magnesium matrix grain size was refined from an initial 80 μm to a final 5 μm. These significant changes in microstructure clearly demonstrate the highly significant refining effect of pulsed current-assisted roller die hot drawing on the second phase and matrix grain size in rare earth magnesium alloys; furthermore, the second phase did not form significant cracks after deformation and fragmentation during the deformation process, indicating that this patented technology fully utilizes the plastic deformation capability of rare earth magnesium alloys. Furthermore, based on the synergistic effect of the strengthening effect of the fine granular and fibrous second phase and the grain refinement strengthening, the tensile strength of the prepared 1.2 mm diameter wire reached 550 MPa. Figure 6 It has significantly higher strength than conventional extruded or rolled alloys. Example 3

[0044] This embodiment provides a method for producing Mg-10Gd-2Y-2Zn-0.5Zr alloy using the apparatus of Example 1, including the following steps:

[0045] Step 1: Using Φ6mm Mg-10Gd-2Y-2Zn-0.5Zr alloy rods obtained by extrusion as raw materials, the rods are placed on a wire feeding frame. One end of the rod passes through a straightener, a tubular heating furnace, an inlet guide hole, an elliptical roller group, a perforated insulating plate, a round roller group, and an outlet guide hole, and is fixed on the drum of the wire drawing machine. After the wire passes through the elliptical roller group and the round roller group, the deformation reaches 15%.

[0046] Step 2: Set the pulse power supply parameters: pulse current 200A, pulse frequency 800Hz, duty cycle 90%;

[0047] Step 3: Connect the power supply to the tubular heating furnace, set the furnace temperature to 200℃, and start heating;

[0048] Step 4: Set the wire drawing speed of the wire drawing machine to 20m / min. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0049] Step 5: After the drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter. After 20 drawing passes, a rare earth magnesium alloy wire with a diameter of 1.2 mm for arc additive manufacturing is obtained. Example 4

[0050] This embodiment provides a method for producing Mg-8Gd-3Y-2Zn-0.5Zr alloy using the apparatus of Example 1, including the following steps:

[0051] Step 1: Using Φ6mm Mg-8Gd-3Y-2Zn-0.5Zr alloy rods obtained by extrusion as raw materials, the rods are placed on a wire feeding frame. One end of the rod passes through a straightener, a tubular heating furnace, an inlet guide hole, an elliptical roller group, a perforated insulating plate, a round roller group, and an outlet guide hole, and is fixed on the drum of the wire drawing machine. After the wire passes through the elliptical roller group and the round roller group, the deformation reaches 30%.

[0052] Step 2: Set the pulse power supply parameters: pulse current 150A, pulse frequency 200Hz, duty cycle 10%;

[0053] Step 3: Connect the power supply to the tubular heating furnace, set the furnace temperature to 400℃, and start heating;

[0054] Step 4: Set the wire drawing speed of the wire drawing machine to 5m / min. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0055] Step 5: After the drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter. After 9 drawing passes, a rare earth magnesium alloy wire with a diameter of 1.2 mm for arc additive manufacturing is obtained. Example 5

[0056] This embodiment provides a method for producing Mg-9Gd-3Y-2Zn-0.5Zr alloy using the apparatus of Example 1, including the following steps:

[0057] Step 1: Using Φ6mm Mg-9Gd-3Y-2Zn-0.5Zr alloy rods obtained by extrusion as raw materials, the rods are placed on a wire feeding frame. One end of the rod passes through a straightener, a tubular heating furnace, an inlet guide hole, an elliptical roller group, a perforated insulating plate, a round roller group, and an outlet guide hole, and is fixed on the drum of the wire drawing machine. After the wire passes through the elliptical roller group and the round roller group, the deformation reaches 25%.

[0058] Step 2: Set the pulse power supply parameters: pulse current 50A, pulse frequency 400Hz, duty cycle 50%;

[0059] Step 3: Connect the power supply to the tubular heating furnace, set the furnace temperature to 400℃, and start heating;

[0060] Step 4: Set the wire drawing speed of the wire drawing machine to 10m / min. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0061] Step 5: After the drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter. After 11 drawing passes, a rare earth magnesium alloy wire with a diameter of 1.2 mm for arc additive manufacturing is obtained. Example 6

[0062] This embodiment provides a method for producing Mg-9Gd-3Y-2Zn-0.5Zr alloy using the apparatus of Example 1, including the following steps:

[0063] Step 1: Using Φ6mm Mg-9Gd-3Y-2Zn-0.5Zr alloy rods obtained by extrusion as raw materials, the rods are placed on a wire feeding frame. One end of the rod passes through a straightener, a tubular heating furnace, an inlet guide hole, an elliptical roller group, a perforated insulating plate, a round roller group, and an outlet guide hole, and is fixed on the drum of the wire drawing machine. After the wire passes through the elliptical roller group and the round roller group, the deformation reaches 25%.

[0064] Step 2: Set the pulse power supply parameters: pulse current 150A, pulse frequency 600Hz, duty cycle 60%;

[0065] Step 3: Connect the power supply to the tubular heating furnace, set the furnace temperature to 300℃, and start heating;

[0066] Step 4: Set the wire drawing speed of the wire drawing machine to 15m / min. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence to prepare rare earth magnesium alloy wire.

[0067] Step 5: After the drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter. After 11 drawing passes, a rare earth magnesium alloy wire with a diameter of 1.2 mm for arc additive manufacturing is obtained.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing rare earth magnesium alloy wire for arc additive manufacturing by pulse current-assisted hot drawing with a roller die, the apparatus comprising a wire feeding frame (1), a straightener (2), a tubular heating furnace (3), a pulse power supply (4), a roller die (5), and a wire drawing machine (6); wherein the roller die (5) comprises a roller die frame and a roller assembly, characterized in that, The roller mold frame includes an elliptical roller mold frame (9) and a circular roller mold frame (14). The elliptical roller mold frame (9) contains an elliptical roller assembly (10), and the circular roller mold frame (14) contains a circular roller assembly (13). The rollers of the elliptical roller set (10) and the circular roller set (13) are fixed on the elliptical roller mold frame (9) and the circular roller mold frame (14) by high temperature resistant ceramic bearings (12); The elliptical roller mold frame (9) and the round roller mold frame (14) are provided with inlet guide holes (8) and outlet guide holes (16) for insulation treatment. A perforated insulating plate (17) is provided between the outer shells of the elliptical roller mold frame (9) and the round roller mold frame (14). The pulse power supply (4) is connected to the rollers of the elliptical roller group (10) and the circular roller group (13) through the pulse current connection electrode (7) and the wire (11), and the pulse current is sequentially conducted to the rollers and the rare earth magnesium alloy wire to provide pulse current for the wire drawing deformation process. At the same time, the pulse current connection electrode (7) and the roller mold frame, as well as the high temperature resistant ceramic bearing (12) ensure reliable insulation between the rollers and the roller mold frame. The tubular heating furnace (3) is protected by argon gas. Rare earth magnesium alloy wire blank (15) enters the elliptical roller group (10) in the elliptical roller mold frame (9) through the inlet guide hole (8), and then exits through the outlet guide hole (16) through the elliptical roller group (13) in the elliptical roller mold frame (14) via the perforated insulating plate (17), and finally is wound onto the drum of the wire drawing machine (6).

2. A method for preparing rare earth magnesium alloy wire for arc additive manufacturing using the apparatus described in claim 1, characterized in that, The method includes the following steps: Step 1: Place the rare earth magnesium alloy wire blank on the wire feeding frame. One end of the rare earth magnesium alloy wire blank passes through the straightener, tubular heating furnace, wire inlet guide hole, elliptical roller group, perforated insulating plate, round roller group, and wire outlet guide hole, and is fixed on the drum of the wire drawing machine. Step 2: Set the pulse power supply parameters; Step 3: Connect the power supply to the tubular heating furnace and start heating; Step 4: Set the wire drawing speed of the wire drawing machine. After the furnace temperature reaches the set value, turn on the wire drawing machine and the pulse power supply in sequence. Use the high-temperature resistant ceramic bearing to achieve electrical insulation between the roller and the roller die frame. Use the perforated insulating plate and the guide hole with insulation treatment to achieve electrical insulation between the elliptical roller die frame and the round roller die frame. In this way, the pulse current is stably introduced into the rare earth magnesium alloy wire through the roller to perform pulse current-assisted roller die hot drawing to prepare rare earth magnesium alloy wire. Step 5: After drawing is completed, replace the roller with a smaller die and repeat steps 1 to 4 to gradually reduce the wire diameter, finally obtaining a rare earth magnesium alloy wire for arc additive manufacturing with a diameter of 1.2 mm.

3. The method for preparing rare earth magnesium alloy wire for arc additive manufacturing according to claim 2, characterized in that, In step 1, the rare earth magnesium alloy wire undergoes deformation of 15% to 30% after passing through the elliptical roller group and the circular roller group.

4. The method for preparing rare earth magnesium alloy wire for arc additive manufacturing according to claim 2, characterized in that, In step 2, the pulse current is set to 50~200A, the pulse frequency to 200~800Hz, and the duty cycle to 10%~90%.

5. The method for preparing rare earth magnesium alloy wire for arc additive manufacturing according to claim 2, characterized in that, In step 3, the furnace temperature is set to 200~400℃.

6. The method for preparing rare earth magnesium alloy wire for arc additive manufacturing according to claim 2, characterized in that, In step 4, the wire drawing speed of the wire drawing machine is 5~20m / min.

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