Extrusion forming device and forming method of metal wire for additive manufacturing

Abstract

The invention discloses an extrusion forming device and method for metal wires for additive manufacturing, and relates to the field of metal wire forming and manufacturing. The problems that due to a traditional hot drawing technology, metal wire preparation is tedious, and internal stress exists are solved. The device comprises a smelting furnace and two shaping rollers, the smelting furnace is configured to perform melting treatment on metal raw materials to form molten metal, the smelting furnace is provided with a wire outlet channel, and the molten metal can be discharged from the wire outlet channel; the two shaping rollers are arranged side by side in the radial direction, a wire extruding and shaping channel is formed between the two shaping rollers, and a wire outlet of a wire outlet channel of the smelting furnace is located above the wire extruding and shaping channel. And the two shaping rollers rotate oppositely, the wire outlet channel discharges wires and sprays the wires into the wire extruding and shaping channel, and the two shaping rollers extrude and cool the molten metal wires, so that the molten metal wires are formed into solid metal wires. The method is mainly used for preparing the metal wires.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wire forming manufacturing, in particular to an extrusion forming device and method for metal wires used in additive manufacturing. BACKGROUND

[0002] Traditional hot drawing is a typical plastic processing method for preparing magnesium alloy wires, and its process mainly includes the following key links: first, the magnesium alloy blank (such as AZ31, ZK60, etc.) is pretreated, the surface defects are removed by turning or grinding, and recrystallization annealing (300-400℃ for 1-2 hours) is performed to eliminate internal stress and refine grains; then, graphite or molybdenum disulfide and other high-temperature lubricants are coated on the surface of the blank. When drawing, the blank needs to be heated to a plastic deformation temperature range of 200-400℃ (the temperature varies with different alloy compositions), a hard alloy or ceramic die is used for multi-pass drawing, and the deformation amount of each pass is controlled between 10%-30%. The blank needs to be reheated between passes to compensate for the temperature drop caused by the rapid heat dissipation of magnesium alloy, and in order to eliminate the work hardening generated during the drawing process of magnesium alloy, the magnesium alloy wire needs to be annealed in two to three drawing passes. The entire drawing process needs to be carried out at a low speed (0.5-5m / min) and in combination with an optimized die design (cone die half angle 6°-12°) to reduce the deformation resistance. After drawing, subsequent processing is required, including roll straightening to eliminate bending, pickling to remove the surface oxide layer, and low-temperature stress relief annealing (150-200℃), etc. The main challenges of this process are the easy oxidation of magnesium alloy, poor room temperature plasticity, and serious die wear, which usually requires inert gas protection, the addition of rare earth elements to improve plasticity, and the use of nano-lubricants, etc. Compared with cold drawing process, hot drawing can significantly improve the forming performance of magnesium alloy, but requires a more complex temperature control system and higher energy consumption cost.

[0003] It can be seen that in the traditional preparation method, multiple processing procedures and heat treatment procedures are required. Traditional hot drawing of magnesium alloy wires has the main shortcomings of serious high-temperature oxidation, risk of grain coarsening, low processing efficiency (single pass deformation amount is only 10%-30%), fast die wear, high energy consumption, difficult surface quality control, and uneven performance. These defects result in high production cost, complex process and poor product consistency, which restricts the large-scale application of this technology. SUMMARY

[0004] Therefore, the present application provides an extrusion forming device and method for metal wires used in additive manufacturing, which directly extrudes molten metal into metal wires by low-temperature cooling, avoiding the problem of complicated process caused by traditional hot drawing process.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A metal wire extrusion molding device for additive manufacturing, comprising:

[0007] A smelting furnace is configured to melt a metal raw material to form a molten metal. The smelting furnace is provided with a wire outlet channel, and the molten metal can be discharged into a wire through the wire outlet channel.

[0008] There are two shaping rollers, which are radially arranged side by side. A wire extrusion shaping channel is formed between the two shaping rollers, and the wire outlet of the wire outlet channel of the smelting furnace is located above the wire extrusion shaping channel;

[0009] The two shaping rollers rotate in opposite directions, and the wire comes out of the wire outlet channel and is sprayed into the wire extrusion shaping channel. The two shaping rollers squeeze the molten metal wire and cool it to shape the molten metal wire into a solid metal wire.

[0010] Furthermore, the cross-sectional area of ​​the smelting furnace gradually decreases from top to bottom.

[0011] Furthermore, an inert gas barrier layer is provided at the wire outlet of the smelting furnace.

[0012] Furthermore, each shaping roller is provided with a coaxial extrusion groove along the circumferential direction, and a gap is left between the two shaping rollers. The gap and the extrusion grooves on the two shaping rollers constitute a wire extrusion shaping channel.

[0013] Furthermore, it also includes cutting pieces for cutting the sides of the metal wire.

[0014] Furthermore, the two shaping rollers are supported by a roller bracket, and two translation slides are provided on the roller bracket. One of the shaping rollers is rotatably mounted on the roller bracket, and the other shaping roller is mounted on the two translation slides through a translation drive mechanism and can be driven by the translation drive mechanism to move along the translation slide.

[0015] Furthermore, the translation drive mechanism includes a translation motor, a screw, a nut and a support slider. The screw is rotatably installed in the translation slide and can be driven to rotate by the translation motor. The nut is threaded onto the screw and fixedly connected to the support slider. The nut and the support slider are both slidably connected to the inner wall of the translation slide. The other shaping roller rotates on the two support sliders through the roller shaft.

[0016] Furthermore, it also includes a winding roller for winding the metal wire, and the winding roller is arranged below the wire extrusion and shaping channels of the two shaping rollers.

[0017] Furthermore, the metal raw material is a magnesium alloy.

[0018] Another technical solution adopted in this application is:

[0019] An extrusion forming method of metal wire for additive manufacturing is realized by using an extrusion forming device of metal wire for additive manufacturing; the specific forming process is as follows:

[0020] S1, the metal raw material is placed in the smelting furnace, and the air in the smelting furnace is discharged, and the smelting furnace heats the metal raw material to a molten state;

[0021] S2, drive the two shaping rollers to rotate oppositely;

[0022] S3, fill the inert gas into the smelting furnace, extrude the metal melt from the wire outlet channel of the smelting furnace and spray it into the wire extrusion shaping channel between the two shaping rollers;

[0023] S4, the two shaping rollers extrude and cool the molten metal wire to make the molten metal wire into a solid metal wire.

[0024] Compared with the prior art, the application has the following beneficial effects:

[0025] 1. The metal wire extrusion forming device of the application mainly melts the metal raw material into a metal melt and extrudes the wire, and then the two shaping rollers successively extrude, shape, condense and send the wire downward, thereby forming a continuous metal wire. This forming method avoids the repeated drawing-annealing process, so that the metal wire does not have internal stress, improves the service life, and the processing method is simple, which improves the production efficiency of the metal wire. In addition, the forming device of the embodiment has a simple structure, and after the metal wire is shaped and condensed, it is directly wound by the wire winding mechanism, and the overall floor area is small.

[0026] 2. The smelting furnace of the application adopts a spindle shape with a wide upper part and a narrow lower part, which can make the wire outlet of the smelting furnace as close as possible to the wire extrusion shaping channel. On the one hand, the distance between the wire outlet and the inlet of the wire extrusion shaping channel is shortened, so that the molten metal wire can enter the wire extrusion shaping channel as soon as possible in a high-temperature state to ensure the preparation precision; on the other hand, the time of the molten metal wire exposed to the atmosphere is reduced, and the degree of surface oxidation of the molten metal wire is reduced.

[0027] 3. The smelting furnace of the application is provided with an inert gas barrier layer at the wire outlet, so as to isolate the outside air from contacting the molten metal wire and avoid the oxidation reaction between the molten metal wire and oxygen as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application.

[0029] Figure 1 It is a whole structure schematic view of an extrusion forming device of metal wire for additive manufacturing of the application.

[0030] Figure 2 It is a top view of an extrusion forming device of metal wire for additive manufacturing of the application.

[0031] Figure 3 Schematic diagram of the structure of the smelting furnace.

[0032] Figure 4 This is a schematic diagram of the positional relationship arrangement of the two shaping rollers when viewed from above.

[0033] Figure 5 This is a schematic diagram of the positional relationship arrangement of the two shaping rollers in the main view.

[0034] Figure 6 Schematic diagram of the assembly of the translation drive mechanism and the roller bracket.

[0035] Figure 7 It is a structural diagram of the winding mechanism.

[0036] Figure 8 Schematic diagram of the structure of the formed metal wire.

[0037] Figure 9 Schematic diagram of the structure of the cutting part.

[0038] Description of reference numerals:

[0039] Melting furnace 1, furnace body 11, induction coil 12, silicone plug 13, air pipe 14, nozzle 15;

[0040] Forming roller 2, extrusion groove 21;

[0041] Roller bracket 3, base 31, support frame 32, translation slide 321;

[0042] Roller drive motor 4;

[0043] Wire winding mechanism 5, support base 51, winding roller 52;

[0044] Exhaust pipe 6;

[0045] Translation drive mechanism 7, translation motor 71, lead screw 72, nut 73, support slider 74;

[0046] Cutting piece 8;

[0047] Gap 9. DETAILED DESCRIPTION

[0048] The invention of the present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] See also Figure 1 and Figure 2The wire extruding device for additive manufacturing of the embodiment is mainly used for preparing metal wires. It comprises a smelting furnace 1, two shaping rollers 2, a roller support 3, roller drive motors 4 and a wire winding mechanism 5. The two shaping rollers 2 are installed side by side on the roller support 3 and form an extrusion shaping channel between them. Each shaping roller 2 is connected with a roller drive motor 4 and is driven to rotate by the corresponding roller drive motor 4. The smelting furnace 1 is arranged above the two shaping rollers 2 and is provided with a wire outlet channel which is opposite to the extrusion shaping channel. The wire winding mechanism 5 is arranged below the two shaping rollers 2 and is used for winding the extrusion-formed metal wire.

[0050] In use, the smelting furnace 1 is filled with metal raw materials which can be magnesium alloy raw materials and is heated. After the metal raw materials are melted into a metal melt, inert gas is filled into the smelting furnace 1 to pressurize the metal melt so that the metal melt is sprayed out of the wire outlet channel to form a molten metal wire. The molten metal wire enters the extrusion shaping channel between the two shaping rollers 2. The two shaping rollers 2 rotate oppositely, i.e. the left shaping roller 2 rotates clockwise and the right shaping roller 2 rotates counterclockwise. The two shaping rollers 2 extrude the molten metal wire to shape it and also rapidly cool it, so that a solidified metal wire with a regular surface is obtained. The metal wire is also driven to move downward under the rotation force of the two shaping rollers 2. With the continuous wire extrusion and extrusion-cooling shaping of the molten metal wire, a continuous solid metal wire is finally obtained. Finally, the metal wire is wound on the wire winding mechanism 5 to form a coiled metal wire.

[0051] It can be seen that the wire extruding device of the embodiment melts metal raw materials into a metal melt and extrudes the metal melt into a wire, which is then successively extruded, shaped, condensed and sent downward by the two shaping rollers 2, so that a continuous metal wire is formed. This shaping method avoids the repeated drawing and annealing process, so that the metal wire does not have internal stress and the service life is improved. In addition, the shaping device of the embodiment has a simple structure. After the metal wire is shaped and solidified, it is directly wound by the wire winding mechanism 5, so that the overall floor space is small.

[0052] It should be noted that, in order to ensure the continuity of the metal wire, the wire outlet speed of the smelting furnace 1 and the linear speed of the surface of the shaping roller 2 are the same or similar. If the rotation speed of the shaping roller 2 is too slow, the wire material may be stacked. If the rotation speed of the shaping roller 2 is too fast, the molten metal wire may be discontinuous or even broken. Therefore, only when the relative speed of the two is appropriate can a continuous metal wire be formed.

[0053] Reference should be made to Figure 3The smelting furnace 1 of the embodiment adopts an induction smelting furnace, which comprises a furnace body 11 and an induction coil 12 surrounding the furnace body 11. AC power is supplied to the induction coil 12, and the AC power generates an alternating magnetic field through the induction coil 12, directly inducing eddy current in the metal raw material to heat and melt the metal raw material, thereby forming molten metal. The cross-sectional area of the furnace body 11 gradually decreases from top to bottom, and specifically adopts a spindle shape with a wide upper part and a narrow lower part. A nozzle 15 is arranged at the bottom of the furnace body 11. The through hole in the nozzle 15 serves as a wire outlet channel. The upper end of the nozzle 15 is in communication with the inside of the furnace body 11, and the lower end extends to the entrance of the extrusion and shaping channel. In combination with the shape of the furnace body 11, the wire outlet of the furnace body 11 can be as close as possible to the entrance of the extrusion and shaping channel. On the one hand, the distance between the wire outlet and the entrance of the extrusion and shaping channel is shortened, so that the molten metal wire can enter the extrusion and shaping channel as soon as possible in a high-temperature state to ensure the preparation precision. On the other hand, the time during which the molten metal wire is exposed to the atmosphere is reduced, and the degree of oxidation of the surface of the molten metal wire is reduced.

[0054] The diameter of the wire outlet channel of the nozzle 15 can be selected according to the diameter of the prepared metal wire, such as 1 mm, 1.5 mm or 2 mm. The linear speed of the corresponding shaping roller 2 is 12.560 m / s, 16.747 m / s and 25.120 m / s.

[0055] The furnace body 11 of the embodiment is a quartz glass tube. The upper tube opening of the quartz glass tube is sealed by a silica gel plug 13. The silica gel plug 13 is connected to an air pipe 14. The air pipe 14 is connected to a gas cylinder containing inert gas and the inside of the furnace body 11. Inert gas is filled into the air pipe 14. When the air pressure in the inside of the furnace body 11 reaches a certain pressure, the metal melt is extruded into a wire through the wire outlet channel, thereby forming a molten metal wire.

[0056] Referring to Figure 3 In order to avoid oxidation of the molten metal wire during the wire outlet process, the embodiment further comprises an inert gas barrier layer at the wire outlet of the smelting furnace 1 to prevent the outside air from contacting the molten metal wire and to avoid oxidation reaction of the molten metal wire and oxygen as much as possible. Specifically, in combination with Figure 3 The embodiment comprises an air outlet pipe 6 at the wire outlet of the smelting furnace 1. Before and during the wire outlet of the molten metal wire, a large amount of inert gas is continuously supplied to the position between the wire outlet and the entrance of the extrusion and shaping channel through the air outlet pipe 6. Thus, an inert gas barrier layer is formed at the position between the wire outlet and the entrance of the extrusion and shaping channel. During the wire outlet, the outside air can be prevented from contacting the molten metal wire. The inert gas is preferably argon.

[0057] Referring to Figure 4 and Figure 5The embodiment of the forming roller 2 is provided with coaxial extrusion grooves 21 along the circumferential direction. A certain gap 9 is left between the two adjacent forming rollers 2 (the size of the gap is as small as possible as long as it does not affect the rotation of the forming roller 2), and the gap 9 and the extrusion grooves 21 on the two forming rollers 2 form an extrusion forming channel. Figure 5 It can be seen that the cross section of the extrusion forming channel is similar to an hourglass. The molten metal sprayed from the outlet of the smelting furnace 1 is preliminarily cooled in the external atmosphere, and then flows into the inlet of the extrusion forming channel. The molten metal is guided by the extrusion grooves 21 and gathered downward and gathered between the two extrusion grooves 21. With the rotation of the two forming rollers 2, the extrusion grooves 21 of the two forming rollers 2 extrude and shape the molten metal and rapidly cool it, thereby obtaining a metal wire with a regular surface, as shown in the figure. Figure 8

[0058] In the embodiment, a plurality of extrusion grooves 21 are provided on the forming roller 2 along the axial direction, and the groove width and groove depth of each extrusion groove 21 are different. By adjusting the gap 9 between the two forming rollers 2, metal wires of different diameters can be prepared to meet the preparation requirements.

[0059] In addition, due to the existence of the gap 9, the metal wire formed after the extrusion shaping will inevitably form side edges on both sides. Therefore, the embodiment further comprises a cutting member 8 for cutting the side edges on both sides of the metal wire. The cutting member 8 is a cylindrical structure with a tapered inner cross section. A cutting edge is provided at the end of the cutting member 8 with a smaller inner cross section, and the inner diameter of the smaller end is the same as the minimum outer diameter of the metal wire. The metal wire is inserted into the cutting member 8 from the end with a larger inner cross section, and the cutting edge cuts off the side edges on both sides of the metal wire, thereby obtaining a more rounded metal wire.

[0060] Referring to Figure 1 and Figure 6 The roller support 3 of the embodiment comprises a base 31 and two support frames 32. The two support frames 32 are arranged in front of and behind each other and are fixed to the base 31. A translation slide 321 is provided on the cross beam of each support frame 32 along the length direction, and the translation slides 321 on the two support frames 32 are oppositely arranged. One of the forming rollers 2 is rotatably installed between the two support frames 32 through a roller shaft, and the other forming roller 2 is installed on the two support frames 32 through a translation driving mechanism 7 and can be driven by the translation driving mechanism 7 to move along the translation slide 321. In this way, the gap 9 between the two forming rollers 2 can be adjusted to realize the preparation of metal wires of different diameters.

[0061] Referring to Figure 6 ​The translation driving mechanism 7 of the embodiment is provided with two sets and is arranged in the two translation slides 321 respectively. Each set of translation driving mechanism 7 comprises a translation motor 71, a lead screw 72, a nut 73 and a supporting slider 74. The translation motor 71 is installed on the support frame 32. The lead screw 72 is rotatably installed in the translation slide 321 and is fixedly connected with the motor shaft of the translation motor 71. The nut 73 is screwed on the lead screw 72 and is fixedly connected with the supporting slider 74. The nut 73 and the supporting slider 74 are slidingly connected with the inner wall of the translation slide 321. The other sizing roller 2 is rotatably arranged on the two supporting sliders 74. When the translation motor 71 drives the lead screw 72 to rotate, the nut 73 moves along the translation slide 321 under the limitation of the translation slide 321. The supporting slider 74 moves with the nut 73 and drives the other sizing roller 2 to move, so as to adjust the gap 9 between the two sizing rollers 2.

[0062] Referring to Figure 7 The wire winding mechanism 5 of the embodiment comprises a supporting base 31 and a wire winding roller 52. The wire winding roller 52 is rotatably installed on the supporting base 31 and is used for winding the prepared metal wire.

[0063] The embodiment also provides an extrusion forming method of metal wire for additive manufacturing. The specific forming process is as follows:

[0064] S1, the diameter of the prepared metal wire is determined. The smelting furnace 1 is arranged at the middle position above the two sizing rollers 2. The wire outlet of the smelting furnace 1 is aligned with the corresponding size of the extrusion groove 21.

[0065] S2, the metal raw material is filled into the smelting furnace 1 and is sealed. Then, the inert gas is introduced into the smelting furnace 1 to discharge the air in the smelting furnace 1, that is, the metal raw material is smelted in the oxygen-free environment through the gas washing method to avoid the oxidation reaction of the metal raw material.

[0066] S3, the alternating current is introduced into the induction coil 12. The alternating current generates an alternating magnetic field through the induction coil 12 to induce eddy current in the metal raw material to heat and melt the metal raw material.

[0067] S4, when the metal raw material is melted into metal melt, a large amount of inert gas is continuously introduced through the gas outlet pipe 6 to the position between the wire outlet and the inlet of the extrusion sizing channel, so as to form an inert gas barrier layer.

[0068] S5, the wire outlet speed of the smelting furnace 1 and the rotation speed of the sizing roller 2 are determined. The roller driving motor 4 drives the two sizing rollers 2 to rotate oppositely.

[0069] S6, inert gas is introduced into the smelting furnace 1, and the molten metal is sprayed out of the nozzle 15 at a certain wire speed to form a molten metal wire, so as to realize the preliminary shaping of the metal wire; wherein the wire speed of the molten metal is the same as or close to the linear speed of the roll surface of the shaping roller 2; the molten metal wire is preliminarily cooled in the external atmosphere, and then flows into the inlet of the extrusion shaping channel, and is guided by the extrusion groove 21 to gather downward and gather between the two extrusion grooves 21, and with the rotation of the two shaping rollers 2, the extrusion grooves 21 of the two shaping rollers 2 extrude and shape the metal melt and rapidly cool it, so as to obtain a solid metal wire with regular surface as shown in Figure 8

[0070] S7, the metal wire is wound on the winding roller 52, so as to obtain a coiled metal wire, and the side edges on both sides of the metal wire are cut off by the cutting member 8.

[0071] Embodiment 1:

[0072] In this embodiment, magnesium alloy is used as raw material to prepare a 1mm magnesium alloy wire, and the specific preparation process is as follows:

[0073] S1, preparation: prepare a magnesium alloy bar, the smelting furnace 1 is a quartz glass tube with an inner diameter of 90mm, a maximum outer diameter of 102mm and a length of 120mm, the inner diameter of the nozzle 15 is 1mm and the length is 80mm, which can ensure that the magnesium alloy liquid does not flow out of the nozzle 15; a silica gel plug 13 at the top of the quartz glass tube is connected to a gas pipe 14 with a diameter of 5mm, which is connected to a flow controller and a gas cylinder filled with argon. The shaping roller 2 is made of red copper with a diameter of 400mm and a thickness of 300mm, and the extrusion grooves 21 with depths and widths of 0.5mm, 0.75mm and 1mm are respectively formed at positions of 75mm, 150mm and 225mm in the thickness direction of the shaping roller 2.

[0074] S2, put the magnesium alloy bar into the quartz glass tube, and seal the upper tube opening of the quartz glass tube with the silica gel plug 13.

[0075] S3, introduce argon into the smelting furnace 1 to discharge the air in the smelting furnace 1 from the nozzle 15 at the bottom;

[0076] S3, introduce alternating current into the induction coil 12, and the alternating current generates an alternating magnetic field through the induction coil 12 to induce eddy current in the metal raw material to heat and melt it;

[0077] S4, after the metal raw material is melted into a metal melt, a large amount of argon is continuously introduced through the gas outlet pipe 14 to the position between the wire outlet and the inlet of the extrusion shaping channel, so as to form an argon barrier layer;

[0078] ​S5, the roller drive motor 4 drives the two shaping rollers 2 to rotate in opposite directions, and the linear speed of the shaping rollers 2 is 12.5600 m / s;

[0079] S6, inert gas is introduced into the smelting furnace 1, the molten metal is sprayed out of the nozzle 15 at a wire speed of 12.5600 m / s, and a molten metal wire is formed to realize preliminary shaping; the molten metal wire is preliminarily cooled in the external atmosphere, and then flows into the inlet of the extrusion shaping channel, the molten metal wire is guided downward by the extrusion grooves 21 and gathered together between the two extrusion grooves 21, and as the two shaping rollers 2 rotate, the two shaping rollers 2 extrude and shape the metal melt and rapidly cool it, thereby obtaining a solid metal wire with a regular surface as shown in Figure 8 .

[0080] S7, the metal wire is wound onto the winding roller 52, thereby obtaining a coiled metal wire, and the side edges on both sides of the metal wire are cut off by the cutting member 8.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created by the present application, and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An extrusion molding device for metal wire for additive manufacturing, characterized in that: include: A smelting furnace is configured to melt a metal raw material to form a molten metal. The smelting furnace is provided with a wire outlet channel, and the molten metal can be discharged into a wire through the wire outlet channel. There are two shaping rollers, which are radially arranged side by side. A wire extrusion shaping channel is formed between the two shaping rollers, and the wire outlet of the wire outlet channel of the smelting furnace is located above the wire extrusion shaping channel; The two shaping rollers rotate in opposite directions, and the wire comes out of the wire outlet channel and is sprayed into the wire extrusion shaping channel. The two shaping rollers squeeze the molten metal wire and cool it to shape the molten metal wire into a solid metal wire.

2. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: The cross-sectional area of ​​the smelting furnace gradually decreases from top to bottom.

3. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: An inert gas barrier layer is also provided at the wire outlet of the smelting furnace.

4. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: A coaxial extrusion groove is provided on each shaping roller along the circumferential direction. A gap is left between the two shaping rollers. The gap and the extrusion grooves on the two shaping rollers form a wire extrusion shaping channel.

5. The extrusion molding device for metal wire for additive manufacturing according to claim 4, characterized in that: The utility model also comprises cutting pieces for cutting the sides of the metal wire.

6. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: The two shaping rollers are supported by a roller bracket, which is provided with two translation slides. One shaping roller is rotatably mounted on the roller bracket, and the other shaping roller is mounted on the two translation slides through a translation drive mechanism and can be driven by the translation drive mechanism to move along the translation slides.

7. The extrusion molding device for metal wire for additive manufacturing according to claim 6, characterized in that: The translation drive mechanism includes a translation motor, a screw, a nut and a support slider. The screw is rotatably installed in the translation slide and can be driven to rotate by the translation motor. The nut is screwed to the screw and fixedly connected to the support slider. The nut and the support slider are both slidably connected to the inner wall of the translation slide. The other shaping roller rotates on the two support sliders through the roller shaft.

8. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: The utility model also comprises a winding roller for winding the metal wire, and the winding roller is arranged below the wire extrusion shaping channels of the two shaping rollers.

9. The extrusion molding device for metal wire for additive manufacturing according to claim 1, characterized in that: The metal raw material is magnesium alloy.

10. A method for extruding a metal wire for additive manufacturing, characterized in that: The method is realized by using the extrusion molding device for metal wire for additive manufacturing according to claim 1; the specific molding process is as follows: S1, placing metal raw materials in a smelting furnace and exhausting the air in the smelting furnace, and the smelting furnace heats the metal raw materials to a molten state; S2 drives the two shaping rollers to rotate in opposite directions; S3, filling the smelting furnace with inert gas, squeezing the molten metal from the wire outlet channel of the smelting furnace and spraying it into the wire extrusion and shaping channel between the two shaping rollers; S4, two shaping rollers squeeze the molten metal wire and cool it, so that the molten metal wire is formed into a solid metal wire.

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