Melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for electric arc additive material

Abstract

The invention discloses a magnesium alloy wire continuous extrusion forming casting device for electric arc additive manufacturing. A magnesium alloy extrusion mold, a magnesium alloy heat preservation device, a magnesium alloy cooling device and a hydraulic telescopic rod device are sequentially arranged on a supporting device. The magnesium alloy extrusion process is optimized, magnesium alloy wires are continuously extruded, the production efficiency is improved, the production line can be flexibly adjusted according to actual requirements, and the production efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the field of additive manufacturing technology, and in particular relates to a melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing. Background Art

[0002] Magnesium alloy has the advantages of low density, high strength, good rigidity, strong shock absorption, low heat capacity, good die-casting performance, good processability, abundant resources, etc. Therefore, magnesium alloy has broad application prospects in medical equipment, automobiles, electronics, aerospace, national defense and transportation. At present, the vast majority of magnesium alloy structural parts are produced by casting technology, and most of magnesium alloy castings are produced by die casting. Therefore, magnesium alloy melting and casting equipment has become the top priority of magnesium alloy production equipment production and development, but at this stage, magnesium alloy melting and casting equipment has problems such as non-continuous production, frequent replacement of billets, high safety risks, unstable temperature control, complex equipment, high energy consumption, and low degree of automation.

[0003] Magnesium alloy wire arc additive manufacturing (WAAM) technology is a wire-based directed energy deposition (DED) method that uses an arc as a heat source, adds wire, and forms metal parts layer by layer under program control. In the WAAM process, magnesium alloy wire is one of the key materials for preparing magnesium alloy components. However, the current production of wire for arc additive manufacturing of magnesium alloys has the following problems: the traditional magnesium alloy extrusion process usually extrude a single molten cast magnesium alloy billet, and continuous extrusion cannot be achieved, which not only affects the stability of the production process, but also significantly reduces production efficiency; the lack of continuous extrusion technology requires frequent replacement of billets during the production process, which increases the complexity of operation and production time, and reduces production efficiency; the traditional process requires pouring the molten magnesium alloy in the magnesium alloy melting furnace into the mold, which has high safety risks and low efficiency. Summary of the invention

[0004] The present invention provides a melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing. The purpose of the invention is to solve the problems of the prior art, realize continuous extrusion of magnesium alloy wire, and improve the production efficiency and flexibility of magnesium alloy wire.

[0005] The technical solution adopted by the present invention is: A melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing, characterized in that: The supporting device is provided with a magnesium alloy extrusion die, a magnesium alloy heat preservation device, a magnesium alloy cooling device and a hydraulic telescopic rod device in sequence; The magnesium alloy extrusion die body of the magnesium alloy extrusion die has an extrusion cavity; The magnesium alloy heat preservation device comprises an outer shell of the magnesium alloy heat preservation device and a magnesium alloy heat preservation device pipeline in the outer shell of the magnesium alloy heat preservation device, and one end of the magnesium alloy heat preservation device pipeline is connected to the extrusion cavity of the magnesium alloy extrusion mold body; The other end of the magnesium alloy insulation device pipeline is provided with an external interface pipeline; The cooling device housing of the magnesium alloy cooling device is mounted on cooling device support frames at both ends by bearings; Several cooling chambers are evenly distributed on the circumference of the inner circumference of the cooling device shell; The position of the cooling chamber corresponds to the external interface pipe at the other end of the pipe of the magnesium alloy insulation device; The position of the telescopic rod of the hydraulic telescopic rod device corresponds to the cooling bin; A stirring rod is arranged in the magnesium alloy smelting furnace, and the magnesium alloy smelting furnace is connected to the magnesium alloy cooling device through a conveying pipeline, and the conveying pipeline passes through a melt pump; The conveying pipeline is connected to the magnesium alloy liquid injection port of the magnesium alloy cooling device, and the magnesium alloy liquid injection port is connected to the cooling bin of the magnesium alloy cooling device.

[0006] Furthermore, the magnesium alloy extrusion die, the magnesium alloy heat preservation device, and the hydraulic telescopic rod device are slidably mounted on the linear guide rail by means of dovetail grooves.

[0007] Furthermore, the extrusion cavity is trumpet-shaped, having a large diameter end and a small diameter end.

[0008] Furthermore, the outer shell of the magnesium alloy thermal insulation device is fixed to the inner thermal insulation layer, the pipeline of the magnesium alloy thermal insulation device passes through the space of the inner thermal insulation layer, and the magnesium alloy heating resistance wire is wound around the outside of the pipeline of the magnesium alloy thermal insulation device.

[0009] Furthermore, a driven wheel shaft of the cooling device passes through and is fixed on the cooling device housing, and is mounted on a cooling device support frame with a bearing; a driven wheel of the cooling device is installed at one end of the driven wheel shaft of the cooling device, the driven wheel of the cooling device is meshed with the driving wheel of the cooling device, and the driving wheel of the cooling device is installed on the driving wheel shaft of the cooling device; an external motor drives the driving wheel shaft of the cooling device.

[0010] Furthermore, the gas inlet of the magnesium alloy cooling device which passes through the cooling device shell and the heat insulation layer of the cooling device is connected to the argon gas bottle.

[0011] Further, the magnesium alloy smelting furnace shell and the magnesium alloy smelting furnace insulation layer are fixed together; The connecting shaft passes through the magnesium alloy melting furnace shell and the magnesium alloy melting furnace insulation layer, and is connected to the straight bevel gear as a gear shaft, and the spur gear is meshed with the straight bevel gear. The upper vertical section and the lower vertical section of the stirring rod are connected by a horizontal connecting section, and the upper vertical section is connected to the spur gear as a gear shaft, and the lower vertical section is an eccentric shaft relative to the spur gear. A magnesium alloy crucible is provided inside the magnesium alloy melting furnace, and a heating resistance wire is wound around the crucible. The conveying pipeline is connected to the bottom opening of the magnesium alloy crucible; The lower vertical section of the stirring rod extends into the magnesium alloy crucible; The connecting shaft is connected to the external electric motor. Beneficial Effects

[0012] 1. The present invention can continuously extrude magnesium alloy wires and improve the production efficiency of magnesium alloy wires.

[0013] 2. The present invention can replace different extrusion molds according to different production requirements, thereby improving production flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of all devices of the present invention; Figure 2 It is a schematic diagram of the structure of the magnesium alloy extrusion die of the present invention; Figure 3 It is a schematic cross-sectional view of the structure of the magnesium alloy extrusion die of the present invention; Figure 4 It is a schematic structural diagram of the magnesium alloy heat preservation device of the present invention; Figure 5 It is a structural schematic diagram of the magnesium alloy cooling device in the present invention; Figure 6 A cross-sectional view of the magnesium alloy cooling device of the present invention; Figure 7 is a half-section view of the magnesium alloy hydraulic device in the invention; Figure 8 It is a structural schematic diagram of the melt pump in the present invention; Fig. 9 It is a cross-sectional view of the magnesium alloy melting furnace of the present invention.

[0015] In the figure: 1-support device, 101-limiter, 102-vertical support plate, 103-two linear guide rails, 104-vertical mounting plate; 105-fixing bolt; 2-magnesium alloy extrusion mold, 201-magnesium alloy extrusion mold support frame, 202-magnesium alloy extrusion mold fixing bolts, 203-magnesium alloy extrusion mold body; 3-magnesium alloy insulation device, 301-fixing bolt, 302-magnesium alloy insulation device outer shell, 303-magnesium alloy insulation device inner insulation layer, 304-magnesium alloy insulation device pipeline, 305-magnesium alloy heating resistance wire, 306-side fixing bolt, 307-external interface pipeline, 308-resistance sensor; 4-magnesium alloy cooling device, 401-magnesium alloy cooling device support frame, 402-magnesium alloy cooling device air inlet, 403-magnesium alloy cooling device exhaust port, 404-magnesium alloy cooling bin baffle, 405-ball bearing, 406-cooling device driven wheel shaft, 407-cooling device driving wheel shaft, 408-cooling device driven wheel, 409-cooling device driving wheel, 410-cooling device housing, 411-cooling device insulation layer, 412-servo motor, 413-connecting rod, 414-baffle, 415-electromagnet, 416- Solenoid valve, 417-magnesium alloy liquid injection port, 418-injection port solenoid valve, 419-injection port electromagnet, 421-injection port connecting rod, 422-injection port servo motor, 423-cooling chamber servo motor, 424-cooling chamber connecting rod, 425-cooling chamber electromagnet, 426-cooling chamber solenoid valve, 427-cooling chamber, 428-non-contact temperature sensor, 429-exhaust port baffle, 430-exhaust port connecting rod, 431-servo motor, 432-inlet connecting rod, 433-inlet baffle, 434-heating resistance wire; 5-hydraulic telescopic rod device, 501-hydraulic telescopic rod device housing, 502-connecting rod, 503-telescopic rod limiter, 504-connecting rod fixing bolt, 505-hydraulic rod, 506-fixing bolt, 507-external connecting rod fixing bolt, 508-hydraulic injection port, 509-vertical mounting plate, 510-external connecting rod; 6-melt pump, 601-melt pump fixing bolt, 602-melt pump insulation layer, 603-melt pump outflow port, 604-melt pump base, 605-melt pump driving wheel fixing shaft, 606-melt pump driving wheel, 607-melt pump driven wheel, 608-melt pump driven wheel fixing shaft, 609-melt pump injection port, 610-melt pump outer shell; 7-magnesium alloy smelting furnace, 701-transportation pipeline, 702-magnesium alloy smelting furnace cover, 703-connecting shaft, 704-magnesium alloy smelting furnace fixing bolts, 705-magnesium alloy smelting furnace shell, 706-magnesium alloy smelting furnace insulation layer, 707-magnesium alloy crucible, 708-magnesium alloy crucible bottom baffle, 709-telescopic rod, 710-servo motor, 711-heating resistance wire, 712-stirring rod, 713-spur gear, 714-air outlet, 715-straight bevel gear, 716-air inlet, 717-magnesium alloy smelting furnace base. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] A melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing, comprising: a magnesium alloy melting furnace 7, a melt pump 6, a magnesium alloy cooling device 4, a magnesium alloy extrusion die 2, a magnesium alloy heat preservation device 3, a hydraulic telescopic rod device 5 and a supporting device 1. The support device 1 is provided with a magnesium alloy extrusion mold 2, a magnesium alloy insulation device 3, a magnesium alloy cooling device 4 and a hydraulic telescopic rod device 5 in sequence; the support device 1 is provided with two linear guide rails 103, and a limiter 101 is provided at one end, so that the device on the support device 1 can move along the linear guide rails 103.

[0018] The magnesium alloy extrusion device comprises a magnesium alloy extrusion die 2 and a magnesium alloy heat preservation device 3 .

[0019] Five cooling chambers 427 are evenly distributed on the inner circumference of the magnesium alloy cooling device 4, and a rotating shaft is provided in the center and supporting structures are provided at both ends.

[0020] The hydraulic telescopic rod device 5 is arranged on a side away from the limiter 101. The hydraulic telescopic rod device 5 is used to feed the cooled and formed magnesium alloy into the magnesium alloy insulation device 3 and can push the magnesium alloy to be processed into an extruded part.

[0021] The magnesium alloy smelting furnace 7 is arranged on one side of the supporting device 1. A stirring rod is arranged in the magnesium alloy smelting furnace 7 to achieve uniform mixing of the melt, which is very important in the casting and production process of the magnesium alloy. The use of the stirring rod 712 can effectively improve the microstructure of the magnesium alloy melt and reduce the growth of dendrites. It also helps to remove gases and inclusions in the melt and improve the overall quality of the magnesium alloy.

[0022] The melt pump 6 is disposed below the magnesium alloy smelting furnace 7 , and the melt pump 6 can deliver the molten magnesium alloy to the magnesium alloy cooling device 4 .

[0023] like Figure 1 As shown: The positional relationship of the magnesium alloy melting furnace 7, the melt pump 6, the magnesium alloy cooling device 4, the magnesium alloy extrusion mold 2, the magnesium alloy insulation device 3, the hydraulic telescopic rod device 5, and the supporting device 1 is displayed.

[0024] The supporting device 1 is composed of a limiter 101 , a vertical supporting plate 102 , two linear guide rails 103 , and a vertical mounting plate 104 .

[0025] Two vertical support plates 102 are located at both ends, and have two linear guide rails 103 . The linear guide rails 103 are fixedly installed on the vertical support plates 102 at both ends by fixing bolts 105 at both ends.

[0026] A stopper 101 is installed on the vertical support plate 102 at one end, and a vertical mounting plate 104 is installed on the vertical support plate 102 at the other end.

[0027] The magnesium alloy extrusion die 2, the magnesium alloy heat preservation device 3, and the hydraulic telescopic rod device 5 are slidably mounted on the linear guide rails 103 with dovetail grooves, so that suitable positions can be adjusted on the two linear guide rails 103 to facilitate subsequent extrusion work.

[0028] The magnesium alloy melting furnace 7 is installed on a magnesium alloy melting furnace base 717 .

[0029] The magnesium alloy smelting furnace 7 is connected to the magnesium alloy cooling device 4 via a delivery pipeline 701 . The delivery pipeline 701 passes through the melt pump 6 .

[0030] like Figure 2 , Figure 3 As shown: The magnesium alloy extrusion die 2 comprises: A magnesium alloy extrusion die support frame 201, a magnesium alloy extrusion die fixing bolt 202, and a magnesium alloy extrusion die body 203; the magnesium alloy extrusion die body 203 is fixed to the magnesium alloy extrusion die support frame 201 by the magnesium alloy extrusion die fixing bolt 202. The magnesium alloy extrusion die body 203 has a trumpet-shaped extrusion cavity with a large diameter end and a small diameter end.

[0031] In addition, the magnesium alloy extrusion die body 203 can be replaced with different extrusion dies according to different process requirements.

[0032] like Figure 4 As shown: The magnesium alloy heat preservation device 3 is mainly composed of the following components: Fixing bolts 301, an outer shell 302 of a magnesium alloy heat preservation device, an internal heat insulation layer 303 of a magnesium alloy heat preservation device, a pipeline 304 of a magnesium alloy heat preservation device, a magnesium alloy heating resistor wire 305, side fixing bolts 306, an external interface pipeline 307 and a non-contact temperature sensor 308.

[0033] The device fixes the outer shell 302 of the magnesium alloy heat preservation device with the inner heat insulation layer 303 by means of fixing bolts 301 and side fixing bolts 306. The magnesium alloy heat preservation device pipe 304 passes through the space of the inner heat insulation layer 303, and the magnesium alloy heating resistance wire 305 is wound around the outside of the magnesium alloy heat preservation device pipe 304. The outer interface pipe 307 needs to be precisely aligned with the magnesium alloy cooling chamber 427.

[0034] The magnesium alloy heat preservation device pipeline 304 is connected to the large diameter end of the extrusion cavity of the magnesium alloy extrusion die body 203 of the magnesium alloy extrusion die 2.

[0035] Before the magnesium alloy is extruded, the magnesium alloy is preheated by means of a heating resistor wire 305. At the same time, a non-contact temperature sensor 308 installed in the magnesium alloy insulation device pipe 304 monitors the temperature in real time to ensure that the magnesium alloy reaches a preset suitable temperature, thereby performing precise extrusion processing.

[0036] The extrusion temperature usually needs to be controlled above the recrystallization temperature of the magnesium alloy to ensure that the material has sufficient plasticity for processing. In addition, the recrystallization temperature of magnesium alloys is generally between 300 and 450°C, but the actual extrusion temperature will also be affected by other factors, such as the initial temperature of the billet, the material and design of the mold, the extrusion ratio, and the required wire quality. The thermoplastic treatment temperature of magnesium alloys should not be too high, usually not exceeding 470°C, to avoid oxidation of magnesium and possible combustion risks. Magnesium alloys are prone to oxidation and combustion problems during hot extrusion. Therefore, in actual production, the extrusion temperature needs to be strictly controlled to ensure sufficient plasticity to reduce material defects and prevent unnecessary economic losses and safety risks caused by excessive temperatures.

[0037] like Figure 5 , Figure 6 As shown: The magnesium alloy cooling device 4 comprises: A magnesium alloy cooling device support frame 401, a magnesium alloy cooling device air inlet 402, a magnesium alloy cooling device exhaust port 403, a magnesium alloy cooling chamber baffle 404, a ball bearing 405, a cooling device driven wheel shaft 406, a cooling device driving wheel shaft 407, a cooling device driven wheel 408, a cooling device driving wheel 409, a cooling device housing 410, a cooling device heat insulation layer 411, a servo motor 412, a connecting rod 413, a baffle 414, an electromagnet 415, an electromagnetic valve 416, a magnesium alloy liquid injection Inlet 417, injection port solenoid valve 418, injection port electromagnet 419, injection port baffle 420, injection port connecting rod 421, injection port servo motor 422, cooling bin servo motor 423, cooling bin connecting rod 424, cooling bin electromagnet 425, cooling bin solenoid valve 426, cooling bin 427, non-contact temperature sensor 428, exhaust port baffle 429, exhaust port connecting rod 430, servo motor 431, air inlet connecting rod 432, air inlet baffle 433, heating resistor 434.

[0038] The magnesium alloy cooling device support frames 401 at both ends are used to support the entire cooling device body.

[0039] The cooling device driven wheel shaft 406 passes through and is fixed on the cooling device housing 410 of the magnesium alloy cooling device 4, and ball bearings 405 are installed at both ends thereof, and are mounted on the cooling device support frame 401. A cooling device driven wheel 408 is installed at one end of the cooling device driven wheel shaft 406, and the cooling device driven wheel 408 is meshed with the cooling device driving wheel 409, and the cooling device driving wheel 409 is installed on the cooling device driving wheel shaft 407.

[0040] The cooling device driving wheel shaft 407 is driven by an external motor, and the cooling device driven wheel 408 and the cooling device driving wheel 409 are meshed with each other to rotate the cooling device driven wheel shaft 406, thereby realizing the rotational movement of the cooling device housing 410, that is, the rotational movement of the magnesium alloy cooling device 4.

[0041] The servo motor 412 drives the connecting rod 413 connected thereto to move. Further, the connecting rod 413 drives the connected baffle 414 to move, and cooperates with the electromagnet 415 and the corresponding solenoid valve 416 to complete the opening and closing operation of the cooling bin port at the left end of the cooling bin 427.

[0042] Similarly, the cooling bin servo motor 423 drives the cooling bin connecting rod 424 connected to it, and the cooling bin connecting rod 424 further drives the connected magnesium alloy cooling bin baffle 404 to move, cooperating with the cooling bin electromagnet 425 and the corresponding cooling bin solenoid valve 426 to complete the opening and closing operations of the cooling bin port at the right end of the cooling bin 427.

[0043] The servo motor 431 drives the exhaust port connecting rod 430 connected thereto, and the exhaust port connecting rod 430 further drives the connected exhaust port baffle 429 to move, thereby completing the opening and closing operation of the exhaust port 403 of the magnesium alloy cooling device.

[0044] The servo motor 431 drives the air inlet connecting rod 432 connected thereto, and the air inlet connecting rod 432 further drives the connected air inlet baffle 433 to move, thereby completing the opening and closing operation of the air inlet 402 of the magnesium alloy cooling device.

[0045] The injection port servo motor 422 drives the injection port connecting rod 421 connected thereto, and the injection port connecting rod 421 further drives the connected injection port baffle 420 to move, cooperating with the injection port electromagnet 419 and the corresponding injection port electromagnet 419 to realize the opening and closing operation of the molten magnesium alloy injection port 417.

[0046] The magnesium alloy cooling device air inlet 402 that passes through the cooling device shell 410 and the cooling device insulation layer 411 is connected to the argon gas bottle to ensure that it is filled with argon gas during cooling to prevent the magnesium alloy in a high temperature state from contacting with the air.

[0047] A cooling device insulation layer 411 is installed on the inner surface of the cooling device shell 410, and five cooling chambers 427 are evenly distributed on the circumference of the inner part of the cooling device shell 410, and a heating resistor 434 is arranged outside the cooling chamber 427; a non-contact temperature sensor 428 installed in the shell 410 is used to monitor the temperature of the magnesium alloy in the cooling device 4 at all times, and by adjusting the cooling device and the heating resistor 434, the temperature in the cooling chamber can be arbitrarily adjusted.

[0048] like Figure 7 As shown: The hydraulic telescopic rod device 5 is mainly composed of: The hydraulic telescopic rod device consists of a housing 501, a connecting rod 502, a telescopic rod limiter 503, a connecting rod fixing bolt 504, a hydraulic rod baffle 505, a fixing bolt 506, an external connecting rod fixing bolt 507, a hydraulic injection port 508, a vertical mounting plate 509, and an external connecting rod 510.

[0049] The hydraulic telescopic rod device housing 501 is fixed to the vertical mounting plate 509 by fixing bolts 506 .

[0050] The connecting rod 502 is fixed to the hydraulic rod baffles 505 at both ends by the connecting rod fixing bolts 504; two telescopic rod limiters 503 are arranged before and after the hydraulic rod baffles 505 to limit the range of motion of the hydraulic rod baffles 505. The connecting rod 502 extends into the hydraulic telescopic rod device housing 501, and the hydraulic rod baffle 505 at the right end is located in the hydraulic telescopic rod device housing 501.

[0051] The external connecting rod 510 is fixed to the vertical mounting plate 509 by the external connecting rod fixing bolts 507 .

[0052] The inner cavity of the hydraulic telescopic rod device housing 501 is connected to an external hydraulic pump and a motor through hydraulic injection ports 508 on both sides, and the hydraulic pressure pushes the hydraulic rod baffle 505 to move left and right, thereby realizing the extension and retraction of the hydraulic telescopic rod device 5. The hydraulic device is used to push the cooled and formed magnesium alloy to the magnesium alloy insulation device 3 and the device is used to extrude the magnesium alloy.

[0053] like Figure 8 As shown: The main components of melt pump 6 include: Melt pump fixing bolt 601, melt pump insulation layer 602, melt pump outflow port 603, melt pump base 604, melt pump driving wheel fixing shaft 605, melt pump driving wheel 606, melt pump driven wheel 607, melt pump driven wheel fixing shaft 608, melt pump injection port 609, melt pump outer shell 610.

[0054] The melt pump outer housing 610 is fixed on the melt pump base 604 .

[0055] The melt pump fixing bolts 601 are used to fix the melt pump outer housing 610 and the melt pump heat insulation layer 602 together.

[0056] The melt pump driving wheel 606 is pivotally mounted in the melt pump outer housing 610 by means of the melt pump driving wheel fixed shaft 605 , and the melt pump driven wheel 607 is pivotally mounted in the melt pump outer housing 610 by means of the melt pump driven wheel fixed shaft 608 .

[0057] The melt pump driving wheel 606 and the melt pump driven wheel 607 are meshed with each other. When the melt pump driving wheel 606 and the melt pump driven wheel 607 rotate, the molten magnesium alloy enters the suction chamber between the gears from the melt pump injection port 609. As the gears continue to rotate, the molten magnesium alloy is brought into the discharge chamber. When the gears are meshed again, the molten magnesium alloy is pushed out of the discharge chamber and transported to the magnesium alloy cooling device 4 through the melt pump outflow port 603. This process realizes the continuous transportation of the molten magnesium alloy, ensuring the stability and efficiency of the production process.

[0058] like Fig. 9 As shown: The structure of the magnesium alloy melting furnace includes: Conveying pipeline 701, magnesium alloy smelting furnace cover 702, connecting shaft 703, magnesium alloy smelting furnace fixing bolts 704, magnesium alloy smelting furnace shell 705, magnesium alloy smelting furnace insulation layer 706, magnesium alloy crucible 707, magnesium alloy crucible bottom baffle 708, telescopic rod 709, servo motor 710, heating resistance wire 711, stirring rod 712, spur gear 713, air outlet 714, straight bevel gear 715, air inlet 716.

[0059] The magnesium alloy smelting furnace shell 705 and the magnesium alloy smelting furnace insulation layer 706 are fixed together by the magnesium alloy smelting furnace fixing bolts 704. The magnesium alloy smelting furnace cover 702 is located on the top and is provided with an air outlet 714 and an air inlet 716.

[0060] The connecting shaft 703 passes through the magnesium alloy smelting furnace shell 705 and the magnesium alloy smelting furnace insulation layer 706, and is connected to the straight bevel gear 715 as a gear shaft. The spur gear 713 is meshed with the straight bevel gear 715. The upper vertical section and the lower vertical section of the stirring rod 712 are connected by a horizontal connecting section. The upper vertical section is connected to the spur gear 713 as a gear shaft, and the lower vertical section is an eccentric shaft relative to the spur gear 713.

[0061] A magnesium alloy crucible 707 is provided inside the magnesium alloy melting furnace, a heating resistance wire 711 is wound around the outside of the crucible, and a magnesium alloy crucible bottom baffle 708, a telescopic rod 709 and a servo motor 710 are provided at the bottom. The servo motor 710 drives the telescopic rod 709 connected thereto, and the telescopic rod 709 further drives the bottom baffle 708 connected thereto to move, thereby realizing the opening and closing operation of the bottom opening of the magnesium alloy crucible 707 .

[0062] The delivery pipe 701 is connected to the bottom opening of the magnesium alloy crucible 707 .

[0063] The lower vertical section of the stirring rod 712 extends into the magnesium alloy crucible 707 .

[0064] The connecting shaft 703 is connected to an external motor, and the motor drives the connecting shaft 703 to rotate, thereby driving the straight bevel gear 715 and the spur gear 713 to rotate, and finally realizing the rotation of the stirring rod 712. During the magnesium alloy smelting process, the stirring rod 712 fully mixes the elements inside the melt through physical stirring, prevents element segregation, and ensures the uniformity of the material. At the same time, stirring helps to break up and evenly distribute bubbles and other non-metallic impurities in the melt, prevents grain growth problems caused by overheating at a single position for a long time, and thus maintains the microstructure and mechanical properties of the alloy.

[0065] The working process of this device is as follows: The magnesium alloy raw material is placed in the magnesium alloy crucible 707 of the magnesium alloy smelting furnace 7, and the air inlet 716 is connected to the SF6 gas valve, and SF6 is used as a film-forming gas commonly used in the magnesium industry. The gas can be mixed with dry air, nitrogen, or carbon dioxide in proportion to form a mixed protective gas to provide flame retardant protection for magnesium and magnesium alloy melts. When the mixed protective gas reaches an appropriate concentration, the magnesium alloy raw material is heated to a molten state by a heating resistance wire 711. Subsequently, the connecting shaft 703 is connected to an external motor, and the motor drives the connecting shaft 703 to rotate, and then drives the spur gear 713 to rotate through the straight bevel gear 715, so as to realize the rotation of the stirring rod 712, and ensure the uniform mixing of the elements inside the melt through physical stirring, prevent element segregation, and ensure the uniformity of the material.

[0066] The servo motor 710 drives the telescopic rod 709 and the bottom baffle 708 of the magnesium alloy crucible to move the bottom baffle 708 of the magnesium alloy crucible, thereby realizing the opening and closing operation of the bottom opening of the magnesium alloy crucible 707 .

[0067] At the same time, the lower end melt pump 6 is started to allow the molten magnesium alloy to flow from the conveying pipe 701 into the melt pump injection port 609 , and then enter the conveying pipe 701 through the melt pump outlet 603 , and then be transported to the magnesium alloy liquid injection port 417 of the magnesium alloy cooling device 4 .

[0068] Before the magnesium alloy raw material changes from solid to molten state, it is necessary to ensure that the air inside the magnesium alloy cooling device 4 is completely exhausted. Subsequently, the molten magnesium alloy is simultaneously injected into the five cooling chambers 427 of the magnesium alloy cooling device 4 through the magnesium alloy liquid injection port 417 .

[0069] After the magnesium alloy is cooled to a suitable temperature, the cooling device driving wheel shaft 407 is driven by an external motor, and the driven wheel shaft 406 of the cooling device is rotated by the gear meshing transmission principle, and the cooling device housing 410 is rotated. When the port of a cooling bin 427 is aligned with the hydraulic rod baffle 505 of the hydraulic telescopic rod device 5, the cooled and formed magnesium alloy is pushed to the external interface pipe 307 of the magnesium alloy insulation device 3 through the hydraulic rod baffle 505 of the hydraulic telescopic rod device 5, and then enters the magnesium alloy insulation device pipe 304 to maintain the extrusion temperature of the magnesium alloy.

[0070] After the hydraulic rod baffle 505 of the hydraulic telescopic rod device 5 returns to the initial position, the magnesium alloy liquid injection port 417 of the magnesium alloy cooling bin 427 that has completed pushing is opened again, and the molten magnesium alloy is injected into the cooling bin 427 of the cooling device 4 for cooling.

[0071] The cooling device driving wheel shaft 407 is driven by an external motor, and the driven wheel shaft 406 of the cooling device is rotated by the gear meshing transmission principle, and the cooling device housing 410 is rotated to align the opening of the next cooling bin 427 with the hydraulic telescopic rod device 5, and then the magnesium alloy in the cooling bin 427 is pushed to the magnesium alloy insulation device 3, and the large diameter end of the magnesium alloy after the last push enters the extrusion cavity of the magnesium alloy extrusion die body 203 of the magnesium alloy extrusion die 2, and is extruded out from the small diameter end of the extrusion cavity of the magnesium alloy extrusion die body 203 of the magnesium alloy extrusion die 2. This process is repeated until the operation is completed.

[0072] The invention can replace different extrusion molds for production according to different production requirements, thereby improving the flexibility of production. Multiple cooling bins are arranged to complete the continuous extrusion of magnesium alloy wires, thereby improving the production efficiency to a certain extent.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing, characterized in that: The supporting device is provided with a magnesium alloy extrusion die, a magnesium alloy heat preservation device, a magnesium alloy cooling device and a hydraulic telescopic rod device in sequence; The magnesium alloy extrusion die body of the magnesium alloy extrusion die has an extrusion cavity; The magnesium alloy heat preservation device comprises an outer shell of the magnesium alloy heat preservation device and a magnesium alloy heat preservation device pipeline in the outer shell of the magnesium alloy heat preservation device, and one end of the magnesium alloy heat preservation device pipeline is connected to the extrusion cavity of the magnesium alloy extrusion mold body; The other end of the magnesium alloy insulation device pipeline is provided with an external interface pipeline; The cooling device housing of the magnesium alloy cooling device is mounted on cooling device support frames at both ends by bearings; Several cooling chambers are evenly distributed on the circumference of the inner circumference of the cooling device shell; The position of the cooling chamber corresponds to the external interface pipe at the other end of the pipe of the magnesium alloy insulation device; The position of the telescopic rod of the hydraulic telescopic rod device corresponds to the cooling bin; A stirring rod is arranged in the magnesium alloy smelting furnace, and the magnesium alloy smelting furnace is connected to the magnesium alloy cooling device through a conveying pipeline, and the conveying pipeline passes through a melt pump; The conveying pipeline is connected to the magnesium alloy liquid injection port of the magnesium alloy cooling device, and the magnesium alloy liquid injection port is connected to the cooling bin of the magnesium alloy cooling device.

2. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The magnesium alloy extrusion die, the magnesium alloy heat preservation device and the hydraulic telescopic rod device are slidably mounted on the linear guide rail by means of dovetail grooves.

3. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The extrusion chamber is trumpet-shaped and has a large diameter end and a small diameter end.

4. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The outer shell of the magnesium alloy thermal insulation device is fixed to the inner thermal insulation layer, the pipeline of the magnesium alloy thermal insulation device passes through the space of the inner thermal insulation layer, and the magnesium alloy heating resistance wire is wound around the outside of the pipeline of the magnesium alloy thermal insulation device.

5. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The driven wheel shaft of the cooling device passes through and is fixed on the cooling device housing, and is mounted on the cooling device support frame with a bearing; a driven wheel of the cooling device is installed at one end of the driven wheel shaft of the cooling device, and the driven wheel of the cooling device is meshed with the driving wheel of the cooling device, and the driving wheel of the cooling device is installed on the driving wheel shaft of the cooling device; an external motor drives the driving wheel shaft of the cooling device.

6. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The gas inlet of the magnesium alloy cooling device which passes through the cooling device shell and the heat insulation layer of the cooling device is connected with the argon gas bottle.

7. The melting and casting device capable of realizing continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as claimed in claim 1, characterized in that: The magnesium alloy melting furnace shell and the magnesium alloy melting furnace heat insulation layer are fixed together; The connecting shaft passes through the magnesium alloy melting furnace shell and the magnesium alloy melting furnace insulation layer, and is connected to the straight bevel gear as a gear shaft, and the spur gear is meshed with the straight bevel gear. The upper vertical section and the lower vertical section of the stirring rod are connected by a horizontal connecting section, and the upper vertical section is connected to the spur gear as a gear shaft, and the lower vertical section is an eccentric shaft relative to the spur gear. A magnesium alloy crucible is provided inside the magnesium alloy melting furnace, and a heating resistance wire is wound around the crucible. The conveying pipeline is connected to the bottom opening of the magnesium alloy crucible; The lower vertical section of the stirring rod extends into the magnesium alloy crucible; The connecting shaft is connected to the external electric motor.

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