MAGNESIUM ALLOY MODULE AND DUAL-MODULE DIE CASTING MACHINE

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority to Chinese Patent Application No. 202510060453.1, filed on January 15, 2025, the entire disclosure of which is incorporated herein by reference.

FIELD OF TECHNOLOGY

[0002] This application relates to the technical field of die casting machines, and in particular to a magnesium alloy module and a dual-module die casting machine.

BACKGROUND

[0003] Die casting machines are machines used for pressure casting, and include two types: a hot chamber die casting machine and a cold chamber die casting machine. The die casting machines are further divided into a vertical die casting machine and a horizontal die casting machine. Under pressure, the die casting machine injects molten metal into a mold for cooling and forming. After the mold is opened, a solid metal casting is obtained, which is initially used for casting a lead type.

[0004] During a product die casting process, different materials are used for different products, such as aluminum alloy die casting and magnesium alloy die casting, both of which employ cold chamber die casting: a casting chamber in a cold chamber die casting machine is separated from a holding furnace. During die casting, liquid metal is taken from the holding furnace and poured into the casting chamber for die casting. Especially, metal melt for magnesium alloy die casting is in a solid-liquid mixed state, so that it is not easy to add the melt metal from the holding furnace to a die casting machine body. In addition, to prevent oxidation of magnesium metal and alloys by air, SF6 protective gas needs to be used during both melting and die casting of magnesium alloys, which increases production costs. Therefore, a magnesium alloy module and a dual-module die casting machine are proposed to address the above technical problems.

SUMMARY

[0005] One objective of this application is to provide a magnesium alloy module.

[0006] Another objective of this application is to provide a dual-module die casting machine.

[0007] To achieve the above objectives, technical solutions used in this application are as follows: a magnesium alloy module, including a worktable and a melting barrel, a conveying mechanism, and an injection module mounted on the worktable. The conveying mechanism cooperates with the melting barrel, and the injection module cooperates with the conveying mechanism. During magnesium alloy die casting, the magnesium alloy module is adapted to perform two processes: in a first process, the conveying mechanism is adapted to convey and fill magnesium particles into the melting barrel, thereby forming magnesium melt under the melting action of the melting barrel; and in a second process, the injection module is adapted to cooperate with the conveying mechanism to inject the magnesium melt from a feed head of the melting barrel into a die casting machine body.

[0008] Preferably, the conveying mechanism includes a mounting block, a screw rod, and a drive apparatus, the mounting block is horizontally and slidably mounted on the worktable, the drive apparatus is mounted on the mounting block, the screw rod is located inside the melting barrel, a first end of the screw rod is rotatably mounted on the mounting block and is connected to an output shaft of the drive apparatus through a spline, and the mounting block is operatively connected to the injection module; and in a first process, the drive apparatus is adapted to drive the screw rod to rotate and convey and fill metal particles entering from a feed port of the melting barrel into the melting barrel, then the screw rod moves toward a direction away from the melting barrel under a reaction force of the metal particles, and simultaneously, the injection module is adapted to drive the mounting block to be away from the melting barrel; and in a second process, the injection module is adapted to drive the mounting block to be close to the melting barrel, thereby, under the action of a screw head at a second end of the screw rod, the magnesium melt is discharged from the melting barrel.

[0009] Preferably, the injection module includes an injection base and an injection shift cylinder, the injection base is mounted on the worktable and is corresponding to the mounting block; the melting barrel is fixedly mounted on the injection base; a cylinder body of the injection shift cylinder is hinged to a first connecting base, a piston end of the injection shift cylinder is hinged to a second connecting base, the first connecting base is mounted on the injection base, and the second connecting base is mounted on the mounting block.

[0010] Preferably, the screw head includes a rod head portion, a blocking portion, a check ring, a collar, and a washer, the rod head portion is threadedly mounted on a second end of the screw rod, the blocking portion and the washer are both disposed on an outer side of the rod head portion, with a gap formed between the blocking portion and the washer, a plurality of material grooves are provided on the outside of the blocking portion, the collar is sleeved on the outside of the check ring and abuts against an inner wall of the melting barrel, the check ring is sleeved on the rod head portion and is corresponding to the gap, an axial length of the check ring is less than a length of the gap, and a flow channel connected to the material grooves is formed between the check ring and the gap; and during the conveying of the magnesium melt, the check ring abuts the blocking portion, thereby forming a gap between the check ring and the washer, allowing the magnesium melt to pass through the gap, the flow channel, and the material groove, and be injected into the feed head; when the magnesium melt undergoes backflow, the check ring is adapted to abut against the washer under a flow force, thereby reducing or closing the gap, and thus buffering or blocking a backflow force.

[0011] A dual-module die casting machine, including a die casting machine body, an injection module, and the above magnesium alloy module, where the injection module is mounted on a side of the die casting machine body and is arranged linearly with the die casting machine body; the melting barrel is operatively connected to the injection module and is arranged vertically with the die casting machine body; during die casting in a first mode, the injection module is adapted to inject added aluminum melt into the die casting machine body for forming; and during die casting in a second mode, the melting barrel is adapted to first inject the magnesium melt into the injection module, and then the injection module is adapted to inject the magnesium melt into the die casting machine body for forming.

[0012] Preferably, a thrust mechanism is mounted on the die casting machine body, the thrust mechanism cooperates with the injection module and is arranged linearly corresponding to the melting barrel; and the thrust mechanism is adapted to drive the injection module and the melting barrel into abutting cooperation, so that a sealed state is maintained between the injection module and the melting barrel.

[0013] Preferably, the injection module includes a material injection barrel, a material extrusion barrel, and an injection nozzle, the material injection barrel is mounted on a fixed platen of the die casting machine body, an end of the material injection barrel is sequentially provided with and communicates with the material extrusion barrel and the injection nozzle, the injection nozzle cooperates with a cavity of the die casting machine body, and the material extrusion barrel is operatively connected to the melting barrel.

[0014] Preferably, the inner diameter of the feed head is less than the inner diameter of the material extrusion barrel, and the inner diameter of the injection nozzle is less than the diameter of the gate in the cavity.

[0015] Preferably, the thrust mechanism includes a thrust cylinder and a ram head, the thrust cylinder is mounted on the fixed platen, and one end of a piston rod is mounted with the ram head; and the thrust cylinder is adapted to drive the ram head to abut against and act on the material extrusion barrel, thereby enabling the material extrusion barrel and the feed head to form a sealed abutting fit.

[0016] Preferably, limit rods that are vertically and symmetrically distributed are mounted through the fixed platen; the magnesium alloy module cooperates with first ends of the limit rods, thereby implementing position locking of the magnesium alloy module; and the thrust mechanism performs locked mounting through second ends of the limit rods.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018](1) according to the present invention, a melting process of the magnesium melt can be implemented through the melting barrel, and the melting barrel is directly connected to the die casting machine body, which facilitates conveying of the magnesium melt and reduces heat loss, thereby improving the efficiency of an entire die casting process and reducing costs. Moreover, sealing performance of the melting barrel enables the die casting process to be performed without the use of SF6 protective gas, reducing costs, and increasing safety and achieving environmental protection.

[0019](2) According to the present invention, both a magnesium alloy injection mode and an aluminum alloy injection mode are implemented by mounting the magnesium melting module on an existing cold chamber die casting machine, thereby allowing two different forms of metal melt to be used on the same die casting machine, eliminating the need for two separate die casting machines and significantly reducing device costs and space requirements.

[0020](3) Compared with traditional cold chamber die casting, the magnesium alloy injection module can significantly reduce energy consumption by greatly lowering a working temperature, decreasing magnesium content in product casting, and reducing system's high power.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021]FIG. 1 is a schematic diagram of an overall structure according to the present invention.

[0022]FIG. 2 is a schematic diagram of a partial structure according to the present invention.

[0023]FIG. 3 is a schematic sectional diagram of FIG. 2 according to the present invention.

[0024]FIG. 4 is a schematic enlarged diagram of a position A according to the present invention.

[0025]FIG. 5(a) and FIG. 5(b) are schematic diagrams of a mounting structure among a melting module, an injection module, and a thrust mechanism according to the present invention.

[0026]FIG. 6 is a schematic diagram of an overall structure of the melting module according to the present invention.

[0027]FIG. 7 is a schematic diagram of a specific structure of the melting module according to the present invention.

[0028]FIG. 8 is a schematic diagram of a principle of magnesium particle injection and conveying according to the present invention.

[0029]FIG. 9 is a schematic diagram of a principle of magnesium particle injection after melting according to the present invention.

[0030]FIG. 10 is a schematic diagram of a screw rod structure according to the present invention.

[0031]FIG. 11(a) and FIG. 11(b) are schematic diagrams of a principle when a magnesium material flows through a screw head and goes through backflow according to the present invention.

[0032]FIG. 12 is a schematic diagram of a specific structure of the screw head according to the present invention.

[0033]FIG. 13 is a schematic diagram of a mold bridge assembly according to the present invention.

DESCRIPTION OF THE EMBODIMENTS

[0034] The following provides a further description of this application with reference to specific implementations. It should be noted that, provided there is no conflict, embodiments or technical features described below may be freely combined to form new embodiments.

[0035] In the description of this application, it should be noted that directional terms such as "center," "transverse," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating orientation and positional relationships, are based on orientation or positional relationships shown in the drawings, and are intended solely to facilitate the description of this application and simplify the explanation, other than indicating or implying that an apparatus or element referred to need to have a specific orientation, be constructed, or operate in the specific orientation, and should not be construed as limiting a specific scope of protection of this application.

[0036] It should be noted that terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0037] In one preferred embodiment of this application, FIG. 1 to FIG. 13 show a magnesium alloy module, including a worktable and a melting module 4 mounted on the worktable. The melting module 4 includes a melting barrel 401, a conveying mechanism 402, and an injection module 403. The melting barrel 401 is mounted on the worktable, the conveying mechanism 402 is mounted on the worktable and cooperates with the melting barrel 401, and the injection module 403 is mounted on the worktable and cooperates with the conveying mechanism 402.

[0038] It can be understood that during magnesium alloy die casting, the melting module 4 undergoes two processes. In a first process, solid magnesium metal particles are placed into a feed port 8 of the melting barrel 401, then the conveying mechanism 402 conveys and fills the magnesium particles, which are distributed inside the melting barrel 401, as shown in FIG. 8. It should be noted that, in this case, the magnesium metal particles essentially expel air inside the melting barrel 401, thereby preventing subsequent oxidation of the magnesium alloy by air. Subsequently, a heating assembly on the melting barrel 401 melts the metal particles to obtain magnesium melt, namely, semi-solid metal melt (in a state of liquid encapsulating solid particles). In a second process, in this case, the injection module 403 and the conveying mechanism 402 cooperate to inject the magnesium melt from the melting barrel 401 (namely, a feed head 6 at a left end of the melting barrel 401) into a die casting machine body 1 for a subsequent die casting process.

[0039] It can be learned that a melting process of the magnesium melt can be implemented through the melting barrel 401, and the melting barrel 401 is directly connected to the die casting machine body 1, which facilitates conveying of the magnesium melt and reduces heat loss, thereby improving the efficiency of an entire die casting process and reducing costs. Moreover, the melting barrel 401 has sealing performance, so that the die casting process is performed without the use of SF6 protective gas, reducing costs, increasing safety, and achieving environmental protection. In addition, because the melting barrel 401 is smaller and more compact than a holding furnace in the prior art, a working temperature can be greatly reduced, and magnesium content in product casting and system's high power can be reduced, thereby significantly reducing energy consumption.

[0040]As a further description of the above embodiment, the conveying mechanism 402 includes a mounting block 4021, a screw rod 4022, and a drive apparatus 4023 (such as a motor). The screw rod 4022 is similar to a helical auger structure, and the screw rod 4022 is rotated to convey a material. The mounting block 4021 is horizontally and slidably mounted on the worktable (as shown in FIG. 2, the melting module 4 is entirely mounted on the worktable), the drive apparatus 4023 is mounted on the mounting block 4021, the screw rod 4022 is located inside the melting barrel 401, a first end (right end) of the screw rod 4022 is rotatably disposed on the mounting block 4021 and is connected to an output shaft of the drive apparatus 4023 through a spline, that is, the screw rod 4022 can not only rotate axially but also move axially. The mounting block 4021 is cooperatively connected to the injection module 403.

[0041] It can be understood that during the first process, as shown in FIG. 8, namely, during magnesium particle conveying, the drive apparatus 4023 can drive the screw rod 4022 to rotate, thereby conveying and distributing the magnesium particles entering from the feed port 8 of the melting barrel 401 into the melting barrel 401. In this case, the feed port 8 can be closed to ensure the sealing performance of the melting barrel 401. It is learned that while the screw rod 4022 exerts a conveying force on the magnesium particles, the magnesium particles also exert a reaction force on the screw rod 4022, causing the screw rod 4022 to move in a direction away from the melting barrel 401 under this reaction force. Meanwhile, the injection module 3 also drives the mounting block 4021 to be away from the melting barrel 401, thereby allowing the drive apparatus 4023 to move away without interfering with the movement of the screw rod 4022. It should be noted that the retraction of the screw rod 4022 in this process is to prepare for the injection of the magnesium material in a second process.

[0042] During the second process, as shown in FIG. 9, the injection module 403 drives the mounting block 4021 to reset and be close to the melting barrel 401. To be specific, under the action of the drive apparatus 4023, the screw rod 4022 moves toward the interior of the melting barrel 401. During the movement, a screw head 9 at the second end (left end) of the screw rod 4022 injects the magnesium material into a feed head 6, and then the magnesium material is injected from the feed head 6 into the die casting machine body 1.

[0043] As a further description of the above embodiment, as shown in FIG. 9, the injection module 403 includes an injection base 4031 and an injection shift cylinder 4032. The injection base 4031 is mounted on the worktable and is corresponding to the mounting block 4021. The melting barrel 401 is fixedly mounted on the injection base 4031. A cylinder body of the injection shift cylinder 4032 is pivotally mounted with a first connecting base, and a piston end of the injection shift cylinder 4032 is pivotally mounted with a second connecting base. The first connecting base is mounted on the injection base 4031, and the second connecting base is mounted on the mounting block 4021.

[0044] It can be understood that both the cylinder body of the injection shift cylinder 4032 and a piston rod are mounted on the two connecting bases through a pivot connection, and the two connecting bases are respectively fixedly mounted on the injection base 4031 and the mounting block 4021, thereby implementing fixed mounting of the injection shift cylinder 4032. The purpose of this pivoted mounting method is as follows: for example, when the mounting block 4021 malfunctions, the second connecting base can be disassembled, and then the injection shift cylinder 4032 can be rotated around the piston rod to move away from the mounting block 4021. In this way, the interference caused by the injection shift cylinder 4032 during maintenance of the mounting block 4021 can be eliminated. Moreover, only the cylinder body of the injection shift cylinder 4032 needs to be disassembled simply and easily, and after subsequent maintenance, the mounting efficiency of the injection shift cylinder 4032 can be greatly improved.

[0045] In one embodiment of this application, as shown in FIG. 10 to FIG. 12, the screw head 9 includes a rod head portion 901, a blocking portion 902, a check ring 904, a collar 905, and a washer 903. The rod head portion 901 is threadedly mounted on a second end (left end) of the screw rod 4022, enabling quick assembly and disassembly between the screw head 9 and the screw rod 4022. The blocking portion 902 and the washer 903 are both disposed on an outer side of the rod head portion 901, with a gap formed between the blocking portion 902 and the washer 903. A plurality of material grooves 10 are provided on the outside of the blocking portion 902. The collar 905 is sleeved on the outside of the check ring 904 and abuts against an inner wall of the melting barrel 401. The check ring 904 is sleeved on the rod head portion 901 and is corresponding to the gap. An axial length of the check ring 904 is less than a length of the gap, and a flow channel 11 connected to the material grooves 10 is formed between the inside of the check ring 904 and the gap.

[0046] It can be understood that a flow direction of the magnesium material in the melting barrel 401 is as shown in FIG. 11(a) (namely, an arrow): because the check ring 904 is movably sleeved on the rod head portion 901, under a flow force of the magnesium material, the check ring 904 abuts against the blocking portion 902 on a left side, and a gap 12 is formed between the check ring 904 and the washer 903 on a right side. With a conveying action of the screw rod 4022, the magnesium material on a right side of the melting barrel 401 flows from the gap 12, the flow channel 11, and the material grooves 10 into a storage chamber on the left side of the melting barrel 401, as shown in FIG. 8.

[0047] During injection, as shown in FIG. 9, the screw head 9 moves to the left under the action of the screw rod 4022, thereby injecting the magnesium material in the storage chamber from the feed head 6 into the injection module 3. During injection, due to the reaction force of the magnesium material, the magnesium material undergoes backflow, as shown in FIG. 11 (b). In this case, the check ring 904 abuts against the washer 903 on the right side under this reaction force, thus closing the gap 12, thereby blocking the magnesium material, preventing backflow, and improving a utilization rate of the magnesium material. As shown in FIG. 12, a plurality of notches may be provided on a right side of the check ring 904. When the check ring 904 abuts against the washer 903, the presence of the notches reduces but does not close the gap 12. This prevents an excessive force from the magnesium material from causing leakage in the melting barrel 401 or a material extrusion barrel 302. To be specific, the gap 12 can provide a buffering effect for a backflow force of the magnesium material while ensuring sufficient injection, thereby ensuring a smooth progress of an entire die casting process. Of course, when the gap 12 is disposed, whether the gap 12 is reduced or closed during backflow can be selected by those skilled in the art according to actual conditions.

[0048] In the prior art, it is learned that metal melt for aluminum alloy die casting is in a purely liquid state. As described above, for magnesium alloy, the metal melt for die casting is in a solid-liquid mixed state. Therefore, products of these two materials require two separate and corresponding die casting machines, resulting in increased device costs and an occupied area.

[0049] Therefore, to solve the above technical problem, in another aspect of the present application, a dual-module die casting machine is also provided, including a die casting machine body 1, an injection module 3, and the above magnesium alloy module. The injection module 3 is mounted on a side of the die casting machine body 1 and arranged in a straight line with the die casting machine body 1. The melting barrel 401 is operatively connected to the injection module 3 and arranged vertically with respect to the die casting machine body 1.

[0050] It can be understood that the die casting machine is used in two die casting modes (namely, two modes of magnesium injection and aluminum injection). During die casting in the first mode (namely, aluminum alloy die casting), the injection module 3 can inject a first form of metal melt (namely, aluminum metal melt) added to the die casting machine body 1 for forming. During die casting in the second mode (namely, magnesium alloy die casting), the melting module 4 can first inject the second form of metal melt (namely, magnesium melt) into the injection module 3, and the injection module 3 can then inject the second form of metal melt into the die casting machine body 1 for forming. Therefore, the use of two different forms of metal melt in the same die casting machine is implemented, eliminating the need for two separate die casting machines and thereby reducing device costs and space.

[0051] Specifically, there are two modes in this application: aluminum alloy die casting and magnesium alloy die casting. During die casting in the first mode, it is learned that a melting point of aluminum alloy is relatively high, and therefore, a hot chamber die casting machine cannot be used for production, and only cold chamber die casting can be used. To be specific, the aluminum alloy metal is melted outside the machine, and then melted first form of metal melt (namely, aluminum liquid) is added to the injection module 3, and the injection module 3 injects the first metal melt into the die casting machine for forming. During die casting in the second mode (the magnesium alloy), the melting module 4 first adds the second form of metal melt (namely, magnesium liquid) to the injection module 3, and the injection module 3 then injects the second form of metal melt into the die casting machine for forming. In other words, both forms of metal melt share one injection module 3 during die casting, thereby flexibly implementing two different die casting modes.

[0052] As a further description of the above embodiment, as shown in FIG. 4, the injection module 3 includes a material injection barrel 301, a material extrusion barrel 302, and an injection nozzle 303. The material injection barrel 301 is mounted on a fixed platen 2 of the die casting machine body 1. An end of the material injection barrel 301 is sequentially provided with and communicates with the material extrusion barrel 302 and the injection nozzle 303. The injection nozzle 303 cooperates with a cavity of the die casting machine body 1, and the material extrusion barrel 302 is operatively connected to the melting module 4. It can be understood that the melting module 4 conveys the melted second form of metal melt to the material extrusion barrel 302 and into the material injection barrel 301. Then, an injection ram head in the material injection module 3 injects the second form of metal melt into the die casting machine. It should be noted that how the injection module 3 injects the metal melt from the material injection barrel 301 into the die casting machine is well-known to those skilled in the art and is not described in detail.

[0053] Further, an inner diameter of the feed head 6 is smaller than an inner diameter of the material extrusion barrel 302, and an inner diameter of the material injection nozzle 303 is smaller than a gate diameter in the cavity. Although the gate is not shown in this application, the gate is also commonly known by those skilled in the art. Specifically, a ball diameter of the feed head 6 is slightly smaller than a ball diameter of the material extrusion barrel 302, and a diameter of the injection nozzle 303 is slightly smaller than a diameter of the gate. This structural design can not only prevent cold material accumulation at the gate but also prevent the sprayed melted magnesium material from escaping, thereby providing excellent sealing effect and smooth flow of the magnesium material.

[0054] As shown in FIG. 4 and FIG. 5, the melting module 4 is entirely arranged vertically with respect to the die casting machine body 1, and the melting module 4 is docked and connected to the material extrusion barrel 302 by abutting against the feed head 6. However, the material extrusion barrel 302 may shake during long-term extrusion, which can affect the sealing effect of the connection between the feed head 6 and the material extrusion barrel 302.

[0055]Therefore, to solve the above technical problem, in one embodiment of this application, as shown in FIG. 1. and FIG. 4, a thrust mechanism 5 is mounted on the die casting machine body 1. The thrust mechanism 5 cooperates with the injection module 3 and is arranged corresponding to the melting module 4 in a straight line. It can be understood that in this case, the thrust mechanism 5 can ensure that the injection module 3 and the melting module 4 are always abutted together, so that a seal state is always maintained between the injection module 3 and the melting module 4, thereby ensuring stable conveying of the magnesium material during the die casting.

[0056] Specifically, as shown in FIG. 4, the thrust mechanism 5 includes a thrust cylinder 501 and a ram head 502. The thrust cylinder 501 is mounted on the fixed platen 2, and one end of the piston rod is mounted with the ram head 502. It can be understood that during the die casting, the thrust cylinder 501 extends to drive the ram head 502 to abut against the outside of the material extrusion barrel 302. That is, during injection, the thrust cylinder 501 pushes the ram head 502 to always apply a pressure to the material extrusion barrel 302, and the pressure simultaneously acts on the feed head 6 and the melting barrel 401, serving a sealing function, thereby ensuring stable conveying of the magnesium material during the die casting. Of course, the extension and retraction of the thrust cylinder 501 is precisely controlled by a control system to meet different pressure requirements at different stages of die casting.

[0057] In this embodiment, as shown by FIG. 5(a) and FIG. 5(b), to further enhance mounting stability of the melting module 4 and the convenience of mounting the thrust cylinder 501, a pair of limit rods 7 that are vertically and symmetrically distributed is mounted through the fixed platen 2. Specifically, connecting rods may also be mounted on an upper side and a lower side of the melting module 4, and the connecting rods are then docked and fixed with first ends (left ends) of the limit rods 7, thereby implementing position locking of the melting module 4. At second ends (right ends) of the limit rods 7, a vertical plate may be fixedly mounted by bolts, and the thrust cylinder 501 is fixedly mounted on the vertical plate, thereby implementing locked mounting of the thrust mechanism 5. Therefore, position locking of the melting module 4 and locked mounting of the thrust mechanism 5 can both be implemented by providing the pair of limit rods 7, and the straight-line arrangement of the thrust mechanism 5 and the melting module 4 can be ensured, thereby ensuring the stability and safety of the entire die casting process.

[0058] In this embodiment, as shown in FIG. 1, an injection template 16 is mounted on a left side of the fixed platen 2, that is, inside the die casting machine body 1. In actual use, a model of the injection template 16 varies depending on a product model, while the fixed platen 2 is fixedly mounted, so that the injection template 16 is not easily replaced. It should be learned that a fixed mold insert is mounted on the injection template 16, and a movable platen and a movable mold insert connected to the movable platen are mounted in an area in the die casting machine body 1 corresponding to the injection template 16. The fixed mold insert and the movable mold insert cooperate to form a die casting machine cavity (namely, a mold cavity), which is also common knowledge to those skilled in the art.

[0059] Therefore, to solve the above technical problem, as shown in FIG. 13, an entire mold bridge assembly 13 may be mounted on a frame inside the die casting machine body 1. The fixed platen 2 is fixedly mounted at a right position of the mold bridge assembly 13, a mold bridge 14 is slidably disposed within the mold bridge assembly 13, the injection template 16 is mounted on the mold bridge 14, a tray cylinder 15 is mounted at a bottom end of the fixed platen 2, and one end of a piston rod of the tray cylinder 15 is connected to the mold bridge 14.

[0060] It can be understood that when the tray cylinder 15 retracts to bring the injection template 16 to be close to until abut against and cooperate with the fixed platen 2, the mounting and use of the injection template 16 can be implemented. When disassembling, first, the tray cylinder 15 is extended to move the injection template 16 away from the fixed platen 2, then the injection template 16 and the mold bridge 14 are disassembled. It should be learned that compared with the prior art, original mounting between the injection template 16 and the fixed platen 2 is now designed as mounting between the injection template 16 and the mold bridge 14. A position of the mold bridge 14 can be adjusted by using the tray cylinder 15, which facilitates subsequent disassembly and mounting of the fixed platen 2.

A working principle of the present invention is as follows.

[0061] First, a user selects a corresponding mode based on an injection-molded product, for example, selects the aluminum alloy injection mode via an operation screen on the die casting machine, in which case the magnesium alloy injection is not used. Therefore, built-in parameters in a system are applicable to aluminum alloy die casting. Specifically, externally melted aluminum liquid is added to the injection module 3, and then injected into the die casting machine for forming via the injection module 3.

[0062] When switched to a magnesium alloy injection mode, a magnesium raw material, under the action of the melting module 4, undergoes two processes. A first process, as shown in FIG. 8, involves feeding the magnesium particles through the feed port 8 (corresponding to an upper end of the injection base 4031) of the melting barrel 401. The drive apparatus 4023 rotates the screw rod 4022 to store the material. In this case, the screw rod 4022 moves backward due to a reaction force from compressing the magnesium particles, while the mounting block 4021 also moves backward under the action of the injection shift cylinder 4032. After storage is completed, the mounting block 4021 returns to an original position and moves forward under the action of the injection shift cylinder 4032, pushing semi-molten magnesium from the melting barrel 401 through the feed head 6 into the material extrusion barrel 302. Finally, the injection module 3 injects the semi-solid magnesium into a mold, completing the entire injection process.

[0063] It should be noted that external parts of the material injection barrel 301, the material extrusion barrel 302, the injection nozzle 303, the melting barrel 401, and the feed head 6 are all equipped with heating rings, which heat the material during conveying to a semi-solid state and maintain a constant temperature of the magnesium melt. In addition, compared with a traditional cold chamber die casting machine, the present invention can significantly reduce energy consumption by greatly lowering an operating temperature, reducing magnesium content in product casting, and decreasing system's high power. Additionally, the melting module 4 of magnesium completes injection in a fully enclosed environment, eliminating the need for SF6 protective gas, thereby reducing costs, enhancing safety, and achieving environmental protection. Further, the injection system is simplified, and a melting structure is separated from an injection structure, so that the melting module 4 of magnesium can be easily mounted on an existing cold chamber die casting machine, reducing device configuration and maintenance costs, and implementing stable and continuous production.

[0064] The above describes the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The descriptions in the above embodiments and specification only illustrate the principles of this application. Various modifications and improvements may be made without departing from the spirit and scope of this application, and all such modifications and improvements fall within the scope of protection claimed by this application. The scope of protection claimed by this application is defined by the appended claims and their equivalents.