Melt casting device for realizing continuous extrusion forming of magnesium alloy wire for arc additive

Abstract

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

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing technology, and in particular relates to a casting apparatus capable of continuous extrusion forming of magnesium alloy wire for arc additive manufacturing. Background Technology

[0002] Magnesium alloys possess advantages such as low density, high strength, good rigidity, strong damping, low heat capacity, good die-casting performance, good machinability, and abundant resources. Therefore, magnesium alloys have broad application prospects in medical equipment, automobiles, electronics, aerospace, and national defense transportation. Currently, the vast majority of magnesium alloy structural components are produced using casting technology, and most magnesium alloy castings are produced through die casting. Therefore, magnesium alloy melting and casting equipment has become a top priority in the production and development of magnesium alloy manufacturing equipment. However, current magnesium alloy melting and casting equipment suffers from problems such as discontinuous production, frequent billet changes, high safety risks, unstable temperature control, complex equipment, high energy consumption, and low automation.

[0003] Wire arc additive manufacturing (WAAM) of magnesium alloys is a directional energy deposition (DED) method based on wire. It uses an electric arc as a heat source, adds wire, and forms metal parts layer by layer under program control. Magnesium alloy wire is one of the key materials for fabricating magnesium alloy components in the WAAM process. However, current methods for producing wire for WAAM of magnesium alloys face the following problems: Traditional magnesium alloy extrusion processes typically extrude single molten magnesium alloy billets, making continuous extrusion impossible. This not only affects the stability of the production process but also significantly reduces production efficiency. The lack of continuous extrusion technology necessitates frequent billet changes during production, increasing operational complexity and production time, further reducing efficiency. Traditional processes require pouring molten magnesium alloy from a melting furnace into a mold, which carries high safety risks and low efficiency. Summary of the Invention

[0004] This invention provides a casting apparatus for 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 in this invention is as follows:

[0006] A casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing, characterized in that:

[0007] The support device is equipped 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.

[0008] The magnesium alloy extrusion die body has an extrusion cavity;

[0009] The magnesium alloy insulation device includes an outer shell and a pipe inside the outer shell. One end of the pipe is connected to the extrusion cavity of the magnesium alloy extrusion die body.

[0010] The other end of the magnesium alloy insulation device pipe has an external interface pipe.

[0011] The cooling device housing of the magnesium alloy cooling device is mounted on the cooling device support frame at both ends by bearings;

[0012] The cooling device housing has several cooling chambers evenly distributed around its circumference.

[0013] The location of the cooling chamber corresponds to the external interface pipe at the other end of the aforementioned magnesium alloy insulation device pipe.

[0014] The position of the telescopic rod of the hydraulic telescopic rod device corresponds to the cooling chamber;

[0015] A stirring bar is installed in the magnesium alloy melting furnace. The magnesium alloy melting furnace is connected to the magnesium alloy cooling device through a conveying pipe, which passes through the melt pump.

[0016] The delivery 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 chamber of the magnesium alloy cooling device.

[0017] Furthermore, the magnesium alloy extrusion die, magnesium alloy insulation device, and hydraulic telescopic rod device are slidably mounted on the linear guide rail with dovetail grooves.

[0018] Furthermore, the extrusion chamber is funnel-shaped, with a large-diameter end and a small-diameter end.

[0019] Furthermore, the outer shell of the magnesium alloy insulation device is fixed together with the inner insulation layer, the pipe of the magnesium alloy insulation device passes through the space of the inner insulation layer, and the magnesium alloy heating resistance wire is wrapped around the outside of the pipe of the magnesium alloy insulation device.

[0020] Furthermore, the driven wheel shaft of the cooling device passes through and is fixed on the housing of the cooling device, and is mounted on the support frame of the cooling device with bearings; a driven wheel of the cooling device is installed at one end of the driven wheel shaft, which meshes with the driving wheel of the cooling device, and the driving wheel of the cooling device is mounted on the driving wheel shaft of the cooling device; an external motor drives the driving wheel shaft of the cooling device.

[0021] Furthermore, the air inlet of the magnesium alloy cooling device, which runs through the cooling device shell and the cooling device insulation layer, is connected to the argon cylinder.

[0022] Furthermore, the magnesium alloy smelting furnace shell and the magnesium alloy smelting furnace insulation layer are fixed together;

[0023] The connecting shaft passes through the shell of the magnesium alloy melting furnace and the insulation layer of the magnesium alloy melting furnace. It serves as a gear shaft and is connected to the straight helical gear. The spur gear meshes with the straight helical gear. The upper vertical section and the lower vertical section of the stirring rod are connected by a horizontal connecting section. The upper vertical section serves as a gear shaft and is connected to the spur gear. The lower vertical section is an eccentric shaft relative to the spur gear.

[0024] The magnesium alloy melting furnace contains a magnesium alloy crucible, the outside of which is wrapped with heating resistance wire;

[0025] The delivery pipe is connected to the bottom opening of the magnesium alloy crucible;

[0026] The lower vertical section of the stirring rod extends into the magnesium alloy crucible;

[0027] The connecting shaft is connected to an external motor. Beneficial effects

[0028] 1. This invention can continuously extrude magnesium alloy wire, thereby improving the production efficiency of magnesium alloy wire.

[0029] 2. This invention can change different extrusion dies according to different production requirements, thus improving production flexibility. Attached Figure Description

[0030] Figure 1 These are schematic diagrams of all the devices of the present invention;

[0031] Figure 2 This is a three-dimensional schematic diagram of the magnesium alloy extrusion die in this invention;

[0032] Figure 3 This is a schematic cross-sectional view of the magnesium alloy extrusion die in this invention;

[0033] Figure 4 This is a schematic diagram of the magnesium alloy heat preservation device in this invention;

[0034] Figure 5 This is a schematic diagram of the magnesium alloy cooling device in this invention;

[0035] Figure 6 A cross-sectional view of the magnesium alloy cooling device in this invention;

[0036] Figure 7 This is a half-sectional view of the magnesium alloy hydraulic device in the invention;

[0037] Figure 8 This is a schematic diagram of the melt pump in this invention;

[0038] Figure 9 This is a cross-sectional view of the magnesium alloy smelting furnace in this invention.

[0039] In the picture:

[0040] 1-Support device, 101-Limiter, 102-Vertical support plate, 103-Two linear guides, 104-Vertical mounting plate; 105-Fixing bolts;

[0041] 2-Magnesium alloy extrusion die, 201-Magnesium alloy extrusion die support frame, 202-Magnesium alloy extrusion die fixing bolt, 203-Magnesium alloy extrusion die body;

[0042] 3-Magnesium alloy insulation device, 301-Fixing bolt, 302-Outer shell of magnesium alloy insulation device, 303-Internal insulation layer of magnesium alloy insulation device, 304-Pipe of magnesium alloy insulation device, 305-Magnesium alloy heating resistance wire, 306-Side fixing bolt, 307-External interface pipe, 308-Resistance sensor.

[0043] 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 outlet, 404-Magnesium alloy cooling chamber 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 heat 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;

[0044] 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;

[0045] 6-Melt pump, 601-Melt pump fixing bolt, 602-Melt pump insulation layer, 603-Melt pump outlet, 604-Melt pump base, 605-Melt pump drive wheel fixing shaft, 606-Melt pump drive wheel, 607-Melt pump driven wheel, 608-Melt pump driven wheel fixing shaft, 609-Melt pump inlet, 610-Melt pump outer casing;

[0046] 7-Magnesium alloy smelting furnace, 701-Conveying pipe, 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 helical gear, 716-Air inlet, 717-Magnesium alloy smelting furnace base. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] A melting and casting apparatus for continuous extrusion forming of magnesium alloy wire for electric arc additive manufacturing includes: 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 support device 1.

[0049] The support device 1 is provided with a magnesium alloy extrusion die 2, a magnesium alloy heat preservation 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 at one end, so that the device on the support device 1 can move along the linear guide rails 103.

[0050] The magnesium alloy extrusion device includes a magnesium alloy extrusion die 2 and a magnesium alloy heat preservation device 3.

[0051] The magnesium alloy cooling device 4 has five cooling chambers 427 evenly distributed around its internal circumference, and a rotating shaft is located at the center with supporting structures at both ends.

[0052] The hydraulic telescopic rod device 5 is located on the 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 heat preservation device 3 and can push the magnesium alloy to process it into an extruded part.

[0053] The magnesium alloy melting furnace 7 is located on one side of the support device 1. The stirring rod in the magnesium alloy melting furnace 7 can make the melt uniformly mixed, which is very important in the casting and production process of magnesium alloy. The stirring rod 712 can effectively improve the microstructure of the magnesium alloy melt, reduce dendrite growth, and also help remove gas and inclusions in the melt, thereby improving the overall quality of the magnesium alloy.

[0054] The melt pump 6 is located below the magnesium alloy melting furnace 7. The melt pump 6 can send the molten magnesium alloy to the magnesium alloy cooling device 4.

[0055] like Figure 1 As shown:

[0056] The positional relationship of the magnesium alloy smelting furnace 7, melt pump 6, magnesium alloy cooling device 4, magnesium alloy extrusion die 2, magnesium alloy heat preservation device 3, hydraulic telescopic rod device 5, and support device 1 is shown.

[0057] The support device 1 consists of a limiter 101, a vertical support plate 102, two linear guide rails 103, and a vertical mounting plate 104.

[0058] 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.

[0059] A limiter 101 is installed on one end of the vertical support plate 102, and a vertical mounting plate 104 is installed on the other end of the vertical support plate 102.

[0060] 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 rail 103 with dovetail grooves, so that the appropriate position can be adjusted on the two linear guide rails 103 to facilitate subsequent extrusion work.

[0061] The magnesium alloy melting furnace 7 is installed on the magnesium alloy melting furnace base 717.

[0062] The magnesium alloy melting furnace 7 is connected to the magnesium alloy cooling device 4 via a conveying pipe 701, which passes through the melt pump 6.

[0063] like Figure 2 , Figure 3 As shown:

[0064] Magnesium alloy extrusion die 2 includes:

[0065] The components include a magnesium alloy extrusion die support frame 201, magnesium alloy extrusion die fixing bolts 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 bolts 202. The magnesium alloy extrusion die body 203 has a trumpet-shaped extrusion cavity with a large diameter end and a small diameter end.

[0066] In addition, the magnesium alloy extrusion die body 203 can be replaced with different extrusion dies according to different process requirements.

[0067] like Figure 4 As shown:

[0068] The magnesium alloy insulation device 3 mainly consists of the following components:

[0069] Fixing bolts 301, outer shell of magnesium alloy insulation device 302, inner insulation layer of magnesium alloy insulation device 303, pipe of magnesium alloy insulation device 304, heating resistance wire of magnesium alloy 305, side fixing bolts 306, external interface pipe 307, and non-contact temperature sensor 308.

[0070] The device secures the outer shell 302 of the magnesium alloy insulation device to the inner insulation layer 303 using fixing bolts 301 and side fixing bolts 306. The magnesium alloy insulation device pipe 304 passes through the space of the inner insulation layer 303, and the magnesium alloy heating resistance wire 305 is wound around the outside of the magnesium alloy insulation device pipe 304. The external interface pipe 307 must be precisely aligned with the magnesium alloy cooling chamber 427.

[0071] The pipe 304 of the magnesium alloy insulation device 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.

[0072] Before the magnesium alloy is extruded, the magnesium alloy is preheated using a heating resistance wire 305. At the same time, the temperature is monitored in real time by a non-contact temperature sensor 308 installed in the magnesium alloy insulation device pipe 304 to ensure that the magnesium alloy reaches the preset suitable temperature for precise extrusion processing.

[0073] Extrusion temperatures typically need to be controlled above the recrystallization temperature of magnesium alloys to ensure sufficient plasticity for processing. Furthermore, the recrystallization temperature of magnesium alloys is generally between 300 and 450°C, but the actual extrusion temperature is also affected by other factors, such as the initial temperature of the billet, the material and design of the die, 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 potential combustion risks. Magnesium alloys are prone to oxidation and combustion during hot extrusion; therefore, strict control of the extrusion temperature is necessary in actual production to ensure sufficient plasticity to reduce material defects while preventing unnecessary economic losses and safety risks caused by excessively high temperatures.

[0074] like Figure 5 , Figure 6 As shown:

[0075] The magnesium alloy cooling device 4 consists of:

[0076] Magnesium alloy cooling device support frame 401, magnesium alloy cooling device air inlet 402, magnesium alloy cooling device exhaust port 403, magnesium alloy cooling chamber baffle 404, ball bearing 405, cooling device driven wheel shaft 406, cooling device driving wheel shaft 407, cooling device driven wheel 408, cooling device driving wheel 409, cooling device housing 410, cooling device heat insulation layer 411, servo motor 412, connecting rod 413, baffle 414, electromagnet 415, solenoid valve 416, 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 chamber servo motor 423, Cooling chamber connecting rod 424, Cooling chamber electromagnet 425, Cooling chamber solenoid valve 426, Cooling chamber 427, Non-contact temperature sensor 428, Exhaust port baffle 429, Exhaust port connecting rod 430, Servo motor 431, Inlet connecting rod 432, Inlet baffle 433, Heating resistance wire 434.

[0077] The magnesium alloy cooling device support frame 401 at both ends is used to support the entire cooling device body.

[0078] The driven wheel shaft 406 of the cooling device passes through and is fixed to the cooling device housing 410 of the magnesium alloy cooling device 4, and ball bearings 405 are installed at both ends of the shaft, which is mounted on the cooling device support frame 401. A driven wheel 408 of the cooling device is installed at one end of the driven wheel shaft 406. The driven wheel 408 of the cooling device meshes with the driving wheel 409 of the cooling device, and the driving wheel 409 of the cooling device is mounted on the driving wheel shaft 407 of the cooling device.

[0079] The cooling device drive wheel shaft 407 is driven by an external electric motor. The meshing transmission of the two gears, the driven wheel shaft 406 of the cooling device and the drive wheel 409 of the cooling device, causes the cooling device driven wheel shaft 406 to rotate, thereby realizing the rotational movement of the cooling device housing 410, that is, the rotational movement of the magnesium alloy cooling device 4.

[0080] The servo motor 412 drives the connected link 413 to move. Furthermore, the link 413 drives the connected baffle 414 to move, which, in conjunction with the electromagnet 415 and the corresponding solenoid valve 416, completes the opening and closing operation of the cooling chamber opening at the left end of the cooling chamber 427.

[0081] Similarly, the cooling chamber servo motor 423 drives the connected cooling chamber link 424, which in turn drives the connected magnesium alloy cooling chamber baffle 404 to move. In conjunction with the cooling chamber electromagnet 425 and the corresponding cooling chamber solenoid valve 426, the opening and closing of the cooling chamber opening at the right end of the cooling chamber 427 is completed.

[0082] The servo motor 431 drives the exhaust port connecting rod 430 connected to it, and the exhaust port connecting rod 430 further drives the exhaust port baffle 429 connected to it to move, thereby completing the opening and closing operation of the exhaust port 403 of the magnesium alloy cooling device.

[0083] The servo motor 431 drives the connected air inlet link 432, which in turn drives the connected air inlet baffle 433 to move, thus completing the opening and closing operation of the air inlet 402 of the magnesium alloy cooling device.

[0084] The injection port servo motor 422 drives the injection port connecting rod 421 connected to it, and the injection port connecting rod 421 further drives the injection port baffle 420 connected to it to move. In conjunction with the injection port electromagnet 419 and the corresponding injection port electromagnet 419, the opening and closing operation of the magnesium alloy injection port 417 in the molten state is realized.

[0085] The magnesium alloy cooling device inlet 402, which runs through the cooling device housing 410 and the cooling device insulation layer 411, is connected to an argon cylinder to ensure that the cooling device is filled with argon gas and to prevent the magnesium alloy from coming into contact with air at high temperatures.

[0086] A cooling device insulation layer 411 is installed on the inner surface of the cooling device housing 410. Five cooling chambers 427 are evenly distributed around the inside of the cooling device housing 410. Heating resistance wires 434 are set outside the cooling chambers 427. The temperature of the magnesium alloy inside the cooling device 4 is monitored at all times by a non-contact temperature sensor 428 installed inside the housing 410. The temperature inside the cooling chambers can be arbitrarily adjusted by regulating the cooling device and the heating resistance wires 434.

[0087] like Figure 7As shown:

[0088] The hydraulic telescopic rod device 5 mainly consists of:

[0089] 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.

[0090] The housing 501 of the hydraulic telescopic rod device is fixed to the vertical mounting plate 509 by fixing bolts 506.

[0091] The connecting rod 502 is fixed to the hydraulic rod baffles 505 at both ends by connecting rod fixing bolts 504; two telescopic rod limiters 503 are set at the front and rear of the hydraulic rod baffles 505 to limit the range of motion of the hydraulic rod baffles 505. The connecting rod 502 extends into the housing 501 of the hydraulic telescopic rod device, and the hydraulic rod baffle 505 at the right end is located inside the housing 501 of the hydraulic telescopic rod device.

[0092] The external connecting rod 510 is fixed to the vertical mounting plate 509 by the external connecting rod fixing bolt 507.

[0093] The inner cavity of the housing 501 of the hydraulic telescopic rod device is connected to an external hydraulic pump and motor through hydraulic injection ports 508 on both sides. 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. This hydraulic device is used to push the cooled and formed magnesium alloy to the magnesium alloy insulation device 3, and the magnesium alloy is extruded and formed using this device.

[0094] like Figure 8 As shown:

[0095] The main components of melt pump 6 include:

[0096] 601. Melt pump fixing bolt, 602. Melt pump heat insulation layer, 603. Melt pump outlet, 604. Melt pump base, 605. Melt pump drive wheel fixing shaft, 606. Melt pump drive wheel, 607. Melt pump driven wheel fixing shaft, 608. Melt pump inlet, 609. Melt pump outer housing, 610.

[0097] The outer housing 610 of the melt pump is fixed on the melt pump base 604.

[0098] The melt pump fixing bolt 601 is used to fix the outer housing 610 of the melt pump and the heat insulation layer 602 of the melt pump together.

[0099] The melt pump drive wheel 606 is pivotally mounted inside the melt pump outer housing 610 via the melt pump drive wheel fixing shaft 605, and the melt pump driven wheel 607 is pivotally mounted inside the melt pump outer housing 610 via the melt pump driven wheel fixing shaft 608.

[0100] The drive wheel 606 and driven wheel 607 of the melt pump mesh with each other. As they rotate, molten magnesium alloy enters the suction chamber between the gears from the melt pump inlet 609. With continued gear rotation, the molten magnesium alloy is carried into the discharge chamber. When the gears mesh 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 outlet 603. This process achieves continuous transport of molten magnesium alloy, ensuring the stability and efficiency of the production process.

[0101] like Figure 9 As shown:

[0102] The structure of a magnesium alloy melting furnace includes:

[0103] 701. Conveying pipe, 702. Magnesium alloy smelting furnace cover, 703. Connecting shaft, 704. Magnesium alloy smelting furnace fixing bolt, 705. Magnesium alloy smelting furnace shell, 706. Magnesium alloy smelting furnace heat 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 and helical gear, 716. Air inlet.

[0104] The magnesium alloy melting furnace shell 705 and the magnesium alloy melting furnace insulation layer 706 are fixed together by the magnesium alloy melting furnace fixing bolts 704. The magnesium alloy melting furnace cover 702 is located at the top and is provided with an air outlet 714 and an air inlet 716.

[0105] The connecting shaft 703 passes through the magnesium alloy melting furnace shell 705 and the magnesium alloy melting furnace insulation layer 706, and is connected to the straight helical gear 715 as a gear shaft. The spur gear 713 meshes with the straight helical 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.

[0106] The magnesium alloy melting furnace contains a magnesium alloy crucible 707, around which a heating resistance wire 711 is wound. The bottom of the furnace includes a bottom baffle 708, a telescopic rod 709, and a servo motor 710.

[0107] The servo motor 710 drives the telescopic rod 709 connected to it, and the telescopic rod 709 further drives the bottom baffle 708 of the connected magnesium alloy crucible to move, thereby realizing the opening and closing operation of the bottom opening of the magnesium alloy crucible 707.

[0108] The conveying pipe 701 is connected to the bottom opening of the magnesium alloy crucible 707.

[0109] The lower vertical section of the stirring rod 712 extends into the magnesium alloy crucible 707.

[0110] The connecting shaft 703 is connected to an external electric motor, which drives the connecting shaft 703 to rotate, thereby driving the spur gear 715 and the spur gear 713 to rotate, ultimately achieving the rotation of the stirring rod 712. During the magnesium alloy smelting process, the stirring rod 712 physically stirs the melt to ensure thorough mixing of elements, preventing element segregation and ensuring material homogeneity. Simultaneously, stirring helps to disperse and evenly distribute bubbles and other non-metallic impurities in the melt, preventing grain growth problems caused by prolonged overheating in a single location, thus maintaining the alloy's microstructure and mechanical properties.

[0111] The working process of this device is as follows:

[0112] Magnesium alloy raw materials are placed in the magnesium alloy crucible 707 of the magnesium alloy melting furnace 7. The inlet 716 is connected to an SF6 gas valve, utilizing SF6, a commonly used film-forming gas in the magnesium industry. This gas can be mixed with dry air, nitrogen, or carbon dioxide in a specific ratio to form a mixed protective gas, providing flame-retardant protection for magnesium and the magnesium alloy melt. Once the mixed protective gas reaches a suitable concentration, the magnesium alloy raw materials are heated to a molten state by a heating resistance wire 711. Subsequently, the connecting shaft 703 is connected to an external motor, which drives the connecting shaft 703 to rotate. This, in turn, drives the spur gear 713 to rotate via a helical gear 715, thereby rotating the stirring rod 712. This physical stirring ensures uniform mixing of elements within the melt, prevents element segregation, and guarantees material homogeneity.

[0113] The servo motor 710 drives the telescopic rod 709 and the bottom baffle 708 of the magnesium alloy crucible, thereby enabling the movement of the bottom baffle 708 of the magnesium alloy crucible and realizing the opening and closing operation of the bottom opening of the magnesium alloy crucible 707.

[0114] At the same time, the lower melt pump 6 is started, so that the molten magnesium alloy flows from the conveying pipe 701 into the melt pump inlet 609, and then enters the conveying pipe 701 again through the melt pump outlet 603, and is then conveyed to the magnesium alloy liquid inlet 417 of the magnesium alloy cooling device 4.

[0115] Before the magnesium alloy raw material changes from a solid state to a molten state, it is necessary to ensure that the air inside the magnesium alloy cooling device 4 is completely purged. 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.

[0116] After the magnesium alloy is cooled to a suitable temperature, the driving shaft 407 of the cooling device is driven by an external electric motor. Utilizing the gear meshing transmission principle, the driven shaft 406 of the cooling device rotates, causing the cooling device housing 410 to rotate. When the opening of a cooling chamber 427 aligns with the hydraulic rod baffle 505 of the hydraulic telescopic rod device 5, the cooled and formed magnesium alloy is pushed through the hydraulic rod baffle 505 to the external interface pipe 307 of the magnesium alloy insulation device 3, and then enters the magnesium alloy insulation device pipe 304 to maintain the magnesium alloy extrusion temperature.

[0117] After the hydraulic rod baffle 505 of the hydraulic telescopic rod device 5 returns to its initial position, the magnesium alloy liquid injection port 417 of the cooling chamber 427, which has been pushed, is opened again to inject the molten magnesium alloy into the cooling chamber 427 of the magnesium alloy cooling device 4 for cooling.

[0118] An external electric motor drives the cooling device's drive shaft 407, utilizing gear meshing transmission principles to rotate the driven shaft 406. This causes the cooling device housing 410 to rotate, aligning the opening of the next cooling chamber 427 with the hydraulic telescopic rod device 5. The magnesium alloy in the cooling chamber 427 is then pushed to the magnesium alloy insulation device 3, where it is heated and enters the large-diameter end of the extrusion chamber of the magnesium alloy extrusion die body 203 of the magnesium alloy extrusion die 2. It is then extruded from the small-diameter end of the extrusion chamber to form the finished product. This process is repeated until the operation is complete.

[0119] This invention allows for the replacement of different extrusion dies to meet varying production requirements, thus improving production flexibility. The inclusion of multiple cooling chambers enables continuous extrusion of magnesium alloy wire, further enhancing production efficiency.

[0120] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A casting apparatus capable of continuous extrusion forming of magnesium alloy wire for arc additive manufacturing, characterized in that: include: Magnesium alloy smelting furnace, melt pump, magnesium alloy cooling device, magnesium alloy extrusion die, magnesium alloy heat preservation device, hydraulic telescopic rod device, and support device. The support device is equipped 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 has an extrusion cavity; The magnesium alloy insulation device includes an outer shell and a pipe inside the outer shell. One end of the pipe is connected to the extrusion chamber of the magnesium alloy extrusion die body. The other end of the magnesium alloy insulation device pipe has an external interface pipe; The magnesium alloy cooling device includes a magnesium alloy cooling device support frame, a driven wheel shaft, a driving wheel shaft, a cooling device housing, a cooling device insulation layer, a magnesium alloy liquid inlet, and cooling chambers. The magnesium alloy cooling device support frames at both ends support the entire magnesium alloy cooling device body. Several cooling chambers are evenly distributed around the circumference inside the cooling device housing. The driven wheel shaft passes through and is fixed to the cooling device housing, and is supported by bearings on the cooling device support frame. A driven wheel is installed at one end of the driven wheel shaft, and this driven wheel meshes with the driving wheel. The driving wheel is mounted on the driving wheel shaft. An external motor drives the driving wheel shaft. The hydraulic telescopic rod device includes a hydraulic telescopic rod device housing, a hydraulic rod baffle, and a hydraulic injection port. The inner cavity of the hydraulic telescopic rod device housing is connected to an external hydraulic pump and motor through the hydraulic injection ports on both sides. The hydraulic pressure pushes the hydraulic rod baffle to move left and right, realizing the extension and retraction of the hydraulic telescopic rod device. The hydraulic telescopic rod device is used to push the cooled and formed magnesium alloy to the magnesium alloy heat preservation device and to extrude the magnesium alloy. A stirring bar is installed in the magnesium alloy melting furnace. The magnesium alloy melting furnace is connected to the magnesium alloy cooling device through a conveying pipe, which passes through the melt pump. The delivery 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 chamber of the magnesium alloy cooling device. After the magnesium alloy is cooled to a suitable temperature, an external electric motor drives the driving shaft of the cooling device. Utilizing the gear meshing transmission principle, this rotates the driven shaft of the cooling device, causing the cooling device housing to rotate. When the opening of one cooling chamber aligns with the hydraulic rod baffle of the hydraulic telescopic rod device, the cooled and formed magnesium alloy is pushed through the hydraulic rod baffle to the external interface pipe of the magnesium alloy insulation device, and then enters the magnesium alloy insulation device's pipes to maintain the magnesium alloy extrusion temperature. After the hydraulic rod baffle of the hydraulic telescopic rod device returns to its initial position, the magnesium alloy molten injection port of the cooling chamber that has been pushed open is opened again, and the molten magnesium alloy is injected into the cooling chamber of the magnesium alloy cooling device for cooling. The cooling device's drive shaft is driven by an external electric motor. Using the gear meshing transmission principle, the driven shaft of the cooling device rotates, and the cooling device housing rotates. This aligns the opening of the next cooling chamber with the hydraulic telescopic rod device. Subsequently, the magnesium alloy in the cooling chamber is pushed to the magnesium alloy insulation device, and the heated magnesium alloy pushed in the previous step enters the extrusion chamber of the magnesium alloy extrusion die body.

2. The casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as described in claim 1, characterized in that: Magnesium alloy extrusion die, magnesium alloy heat preservation device, and hydraulic telescopic rod device are slidably mounted on linear guide rails with dovetail grooves.

3. The casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as described in claim 1, characterized in that: The extrusion chamber is funnel-shaped, with a large-diameter end and a small-diameter end.

4. The casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as described in claim 1, characterized in that: The outer shell of the magnesium alloy insulation device is fixed together with the inner insulation layer. The pipe of the magnesium alloy insulation device passes through the space of the inner insulation layer, and the magnesium alloy heating resistance wire is wrapped around the outside of the pipe of the magnesium alloy insulation device.

5. The casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as described in claim 1, characterized in that: The air inlet of the magnesium alloy cooling device, which runs through the cooling device shell and the cooling device insulation layer, is connected to the argon cylinder.

6. The casting apparatus for continuous extrusion forming of magnesium alloy wire for arc additive manufacturing as described in claim 1, characterized in that: The shell of the magnesium alloy smelting furnace and the insulation layer of the magnesium alloy smelting furnace are fixed together; The connecting shaft passes through the shell of the magnesium alloy melting furnace and the insulation layer of the magnesium alloy melting furnace. It serves as a gear shaft and is connected to the straight helical gear. The spur gear meshes with the straight helical gear. The upper vertical section and the lower vertical section of the stirring rod are connected by a horizontal connecting section. The upper vertical section serves as a gear shaft and is connected to the spur gear. The lower vertical section is an eccentric shaft relative to the spur gear. The magnesium alloy melting furnace contains a magnesium alloy crucible, the outside of which is wrapped with heating resistance wire; The delivery pipe 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 an external motor.

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