Magnesium-aluminum dual injection die casting machine and injection system

Abstract

This application discloses a magnesium aluminum dual injection die casting machine and injection system, the magnesium aluminum dual injection die casting machine including a die casting machine body, an injection module, and a melting module, the injection module is attached to the side of the die casting machine body so as to be aligned in a straight line with the die casting machine body, the melting module is installed perpendicular to the die casting machine body so as to be connected to the injection module, and the magnesium aluminum dual injection system uses the above-mentioned magnesium aluminum dual injection die casting machine.

Description

[Technical Field]

[0001] The present application relates to the technical field of die casting machines, and more particularly to magnesium aluminum dual injection die casting machines and injection systems. [Background technology]

[0002] A die-casting machine is a machine used for die-casting (pressure casting). There are two types: hot chamber and cold chamber. The latter is further divided into vertical and horizontal. A die-casting machine uses pressure to inject molten metal into a die, where it cools and forms, and when the die is opened, a solid metal casting is obtained. It was originally used for die-casting type.

[0003] When die casting products, the materials used are different. For example, there are aluminum alloy die casting and magnesium alloy die casting. In the case of aluminum alloy, the molten metal used for die casting is liquid only, while in the case of magnesium alloy, the molten metal used for die casting is a solid-liquid mixture. Therefore, two separate die casting machines are required for products of two different materials, which increases the equipment cost and installation area. Therefore, we propose a magnesium-aluminum dual injection die casting machine to solve the above technical problems. Summary of the Invention [Problem to be solved by the invention]

[0004] One object of the present application is to provide a magnesium aluminum dual injection die casting machine.

[0005] Another object of the present application is to provide a magnesium aluminum dual injection system. [Means for solving the problem]

[0006] To achieve the above objectives, the present application adopts the following technical solution: The magnesium-aluminum dual injection die-casting machine includes a die-casting machine body, an injection module, and a melting module; the injection module is attached to a side of the die-casting machine body so as to be aligned in a straight line with the die-casting machine body; The melting module is provided perpendicular to the die-casting machine body so as to be connected to the injection module; When performing die casting in a first mode, the injection module injects the added molten metal in a first form into the die casting machine body to form it; When performing a second mode of die casting, the melting module injects a second form of molten metal into the injection module, and then the injection module injects the second form of molten metal into the die casting machine body to form it.

[0007] Preferably, a pressing mechanism is attached to the die casting machine body, the pressing mechanism cooperating with the injection module and arranged in a straight line corresponding to the melting module; The pressing mechanism presses the injection module against the melt module so that the injection module and the melt module are maintained in a sealed state.

[0008] Preferably, limit rods arranged symmetrically above and below are provided to penetrate the fixed die plate of the die casting machine body, the melting module engages with the first end of the limit rod, thereby limiting and locking the melting module in position; The pressing mechanism is locked and attached via the second end of the limit rod.

[0009] Preferably, the injection module includes a material injection cylinder, a material extrusion cylinder, and an injection nozzle; The material injection cylinder is attached to a fixed die plate of the die casting machine body, The end of the material injection cylinder is connected to the material extrusion cylinder and the injection nozzle in sequence; the injection nozzle communicates with a mold cavity of the die-casting machine body; The material extrusion cylinder is in communication with the melt module.

[0010] Preferably, the pressing mechanism includes a pressing hydraulic cylinder and an extrusion head, the pressing hydraulic cylinder is attached to the fixed die plate, and the extrusion head is attached to one end of a piston rod of the pressing hydraulic cylinder; The pressing hydraulic cylinder abuts the extrusion head against the material extrusion cylinder, and abuts the material extrusion cylinder and the injection head of the melting module to form a sealed seal.

[0011] Preferably, the internal diameter of the injection head is smaller than the internal diameter of the material extrusion cylinder; The inner diameter of the injection nozzle is smaller than the diameter of the gate opening in the mold cavity.

[0012] According to the magnesium aluminum dual injection system using the above-mentioned magnesium aluminum dual injection die casting machine, when performing die casting in the first mode, it includes low speed injection, high speed injection, and pressure injection, The second mode of die casting includes high speed injection and pressure injection.

[0013] Preferably, the magnesium aluminum dual injection system includes an accumulator, an injection hydraulic cylinder, a pressurized hydraulic cylinder, and a valve module, which are connected through an oil passage; The valve module includes a switch valve V5, a switch valve V8, a servo valve V9, and check valves V11 and V13; The output end of the oil pump is connected to the rod-equipped cavity of the injection hydraulic cylinder via the check valve V11 and the servo valve V9, which are connected in series, to form a first oil passage; The output end of the oil pump is connected to the rodless cavity of the injection hydraulic cylinder via the check valve V11, the check valve V13, the switch valve V8 and the switch valve V5, which are connected in series in this order, to form a second oil passage; In an oil pump only oil supply stage in which low-speed injection is performed, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder through the second oil passage that is open, and the first oil passage and the second oil passage form a differential circuit.

[0014] Preferably, the valve module further includes a servo valve V7; The oil tank is connected to the rod-equipped cavity of the injection hydraulic cylinder via the servo valve V7 to form a third oil passage; During high-speed injection and braking phases, the accumulator supplies oil to the rodless cavity of the injection hydraulic cylinder via the switch valve V4 and the switch valve V5; At the same time, the pressure oil in the rod-equipped cavity of the injection hydraulic cylinder flows back to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are connected to form an A-type half-bridge structure, and the injection speed of the injection hydraulic cylinder is adjusted by controlling the opening of the servo valve V7 and the servo valve V9.

[0015] Preferably, the valve module further includes a switch valve V6; The accumulator is connected to the rodless cavity of the pressurized hydraulic cylinder via the switch valve V4 to form a fourth oil passage; The oil tank is connected to the rod-equipped cavity of the pressurized hydraulic cylinder via the servo valve V7 and the switch valve V6, which are connected in series in this order, to form a fifth oil passage; The output end of the oil pump is connected to the rod-containing cavity of the pressurized hydraulic cylinder via the check valve V11, the servo valve V9, and the switch valve V6, which are connected in series in this order, to form a sixth oil passage; In the pressurized injection stage, the accumulator supplies oil to the rodless cavity of the pressurized hydraulic cylinder through the fourth oil passage that is opened, The pressurized oil in the rod-equipped cavities of the pressurizing hydraulic cylinder and the injection hydraulic cylinder respectively flows back into the oil tank through the connected fifth oil passage and the servo valve V7, At this time, the sixth oil passage and the fifth oil passage are connected to form an A-type half-bridge structure, and the pressurizing pressure of the pressurizing hydraulic cylinder is adjusted by controlling the opening of the servo valve V9 and the servo valve V7.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] (1) According to the present invention, by installing a magnesium melting module in a conventional cold chamber die casting machine, two modes of injection, magnesium alloy and aluminum alloy, can be realized. This allows two different types of molten metal to be used in one die casting machine. This eliminates the need for two die casting machines, significantly reducing equipment costs and space requirements.

[0018] (2) According to the present application, the special injection system, i.e., magnesium-aluminum dual injection mode, shares one injection system, so that the die casting machine does not have a low-speed injection stage, especially for semi-solid magnesium material, i.e., the oil passage does not perform differential operation, and the high-speed stage is immediately entered after energy accumulation is completed, which simplifies the operation flow and improves production efficiency. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of the overall structure of the present application. [Figure 2] FIG. 1 is a partial structural schematic diagram of the present application. [Figure 3] FIG. 3 is a schematic cross-sectional view of FIG. 2 of the present application. [Figure 4] FIG. 1 is an enlarged schematic diagram of the structure at A of the present application. [Figure 5] 1 is a schematic diagram of the mounting structure of a melting module, an injection module, and a pressing mechanism according to the present invention; [Figure 6] 1 is a schematic diagram of the overall structure of a melting module of the present application. [Figure 7] 1 is a schematic diagram showing a specific structure of a melting module according to the present invention; [Figure 8] 1 is a schematic diagram illustrating the principle of injection and transportation of magnesium particles according to the present invention. [Figure 9] FIG. 1 is a schematic diagram illustrating the principle of melting and then injecting magnesium particles according to the present invention. [Figure 10] FIG. 2 is a structural schematic diagram of the screw of the present invention. [Figure 11] 1 is a schematic diagram illustrating the principle of the flow of the magnesium material of the present invention when passing through the screw head and when flowing backward. [Figure 12] 1 is a schematic diagram showing a specific structure of a screw head according to the present invention. [Figure 13] 1 illustrates a die carrier assembly of the present application. [Figure 14] FIG. 1 illustrates the die casting solution metal positioned within the material injection cylinder. [Figure 15] FIG. 2 is a schematic diagram illustrating the operating principle of low-speed injection according to the present application. [Figure 16] FIG. 2 is a schematic diagram illustrating the operating principle of high-speed injection according to the present application. [Figure 17] FIG. 1 is a schematic diagram illustrating the operating principle of pressurized injection according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present application will be further described below in relation to specific embodiments, and it should be noted that, unless inconsistent, the embodiments or technical features described below may be arbitrarily combined to form new embodiments.

[0021] In the description of this application, the orientations or positional relationships indicated by directional terms, such as the terms "center," "lateral," "longitudinal," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," and "counterclockwise," are orientations or positional relationships indicated based on the drawings, and are intended solely for the convenience and simplification of the description of this application. They do not state or imply that the devices or elements indicated therein must necessarily have a specific orientation or be configured or operated in a specific orientation, and should not be understood as limiting the specific scope of protection of this application.

[0022] In addition, the terms "first," "second," etc. in the specification and claims of this application are used to distinguish between similar objects and are not necessarily used to describe a specific order or chronology.

[0023] In one preferred embodiment of the present application, as shown in Figures 1 to 17, the magnesium aluminum dual injection die casting machine includes a die casting machine main body 1, an injection module 3, and a melting module 4, of which the injection module 3 is attached to the side of the die casting machine main body 1 so as to be aligned in a straight line with the die casting machine main body 1, and the melting module 4 is arranged perpendicular to the die casting machine main body 1 so as to be connected to the injection module 3.

[0024] This die casting machine has two die casting modes. When performing die casting in the first mode, the injection module 3 injects the added molten metal of a first type into the die casting machine main body 1 to form a shape. When performing die casting in the second mode, the melting module 4 first injects the molten metal of a second type into the injection module 3, and then the injection module 3 injects the molten metal of the second type into the die casting machine main body 1 to form a shape. This allows two different types of molten metal to be used in one die casting machine, eliminating the need for two die casting machines and reducing equipment costs and saving space.

[0025] Specifically, in this application, there are two modes: aluminum alloy die casting and magnesium alloy die casting. Therefore, in the first mode (aluminum alloy die casting), as is well known, the high melting point of aluminum alloy makes hot chamber die casting impossible; only cold chamber die casting is possible. That is, aluminum alloy is melted outside the machine, and the first molten metal (i.e., molten aluminum) is added to the injection module 3, which then injects the first molten metal into the die casting machine. On the other hand, in the second mode (magnesium alloy die casting), the melting module 4 first adds the second molten metal (i.e., molten magnesium) into the injection module 3, which then injects the second molten metal into the die casting machine. That is, since the two types of molten metal share the same injection module 3 during die casting, two different die casting modes can be flexibly realized.

[0026] 4, the injection module 3 includes a material injection cylinder 301, a material extrusion cylinder 302, and an injection nozzle 303. The material injection cylinder 301 is attached to the fixed die plate 2 of the die casting machine body 1. The material extrusion cylinder 302 and the injection nozzle 303 are connected to the end of the material injection cylinder 301. The injection nozzle 303 is connected to the mold cavity of the die casting machine body 1. The material extrusion cylinder 302 is connected to the melting module 4. The melting module 4 transports the melted second molten metal to the material extrusion cylinder 302 and sends it into the material injection cylinder 301. The second molten metal is then injected into the die casting machine by the injection plunger in the injection module 3. The method by which the injection module 3 injects the molten metal from the material injection cylinder 301 into the die casting machine is common knowledge to those skilled in the art, so detailed explanation will be omitted.

[0027] In this embodiment, as shown in FIG. 6, the melting module 4 includes a melting cylinder 401 mounted on a work table, a transport mechanism 402, and an injection unit 403. The injection head 6 at the end of the melting cylinder 401 abuts and communicates with the material extrusion cylinder 302 (as shown in FIG. 4). The transport mechanism 402 is provided inside the melting cylinder 401 to cooperate with the injection unit 403.

[0028] In the second-mode die casting (i.e., magnesium alloy die casting), the melting module 4 performs two steps. In the first step, as shown in FIG. 8, solid magnesium metal particles are introduced into the melting cylinder 401 through the inlet 8, and then the transport mechanism 402 fills and distributes the magnesium particles within the melting cylinder 401 (note that in this case, the magnesium metal particles push out the air in the melting cylinder 401, preventing the magnesium alloy from being oxidized by the air). At this time, the heating assembly on the melting cylinder 401 melts the metal particles to obtain a second-mode molten metal, i.e., a semi-solid molten metal (solid particles surrounded by liquid). In the second step, the injection unit 403 cooperates with the transport mechanism 402 to inject the second-mode molten metal from the injection head 6 into the material extrusion cylinder 302, enabling the subsequent second-mode die casting.

[0029] Furthermore, the internal diameter of injection head 6 is smaller than that of material extrusion cylinder 302, and the internal diameter of injection nozzle 303 is smaller than the diameter of the gate in the mold cavity. Of course, the gate is not shown in this application, but is common knowledge to those skilled in the art. Specifically, the internal diameter of injection head 6 is slightly smaller than that of material extrusion cylinder 302, and the diameter of injection nozzle 303 is slightly smaller than the gate diameter. This structural design prevents the accumulation of cooled material at the gate and prevents the molten magnesium material from spraying out, achieving a good sealing effect and a smooth flow of magnesium material.

[0030] As shown in FIG. 7 , the transport mechanism 402 includes a mounting block 4021, a screw 4022, and a drive unit 4023 (e.g., a motor). The screw 4022 has a structure similar to that of a screw feeder, and the screw 4022 rotates to transport material. The mounting block 4021 is mounted on a work table so as to be horizontally slidable (as shown in FIG. 2 , the entire melting module 4 is mounted on the work table). The drive unit 4023 is mounted on the mounting block 4021. The screw 4022 is located within the melting cylinder 401. The first end (right end) of the screw 4022 is rotatably mounted on the mounting block 4021 and connected to the output shaft of the drive unit 4023 by a spline. That is, the screw 4022 can not only rotate around its axis but also move axially. The mounting block 4021 is connected to the injection unit 403.

[0031] In the first step, as shown in FIG. 8 , when transporting magnesium particles, the driver 4023 rotates the screw 4022, transporting the magnesium particles introduced through the inlet 8 of the melting cylinder 401 and distributing them within the melting cylinder 401. This closes the inlet 8, ensuring the sealing of the melting cylinder 401 and preventing contact with the outside air. As is well known, when the screw 4022 exerts a transporting force on the magnesium particles, the magnesium particles also exert a counterforce on the screw 4022, causing the screw 4022 to move away from the melting cylinder 401. At the same time, the injection module 3 also moves the mounting block 4021 away from the melting cylinder 401, so that the driver 4023 also moves away from the screw 4022 so as not to interfere with the movement of the screw 4022. The retreat of the screw 4022 in this step is in preparation for the injection of the magnesium material in the second step.

[0032] On the other hand, when performing the second step, as shown in FIG. 9, the injection unit 403 returns the mounting block 4021 to its original position close to the melting cylinder 401, that is, the screw 4022 is moved into the melting cylinder 401 by the driving device 4023, and at the same time, the magnesium material is injected into the injection head 6 by the screw head 9 at the second end (left end) of the screw 4022, and then injected from the injection head 6 into the injection module 3.

[0033] Further explaining the above embodiment, as shown in FIG. 9, the injection unit 403 includes an injection seat 4031 and an injection moving hydraulic cylinder 4032, the injection seat 4031 is mounted on the work table corresponding to the mounting block 4021, the melting cylinder 401 is fixed to the injection seat 4031, a first connecting seat is hingedly connected to the cylinder body of the injection moving hydraulic cylinder 4032, and a second connecting seat is hingedly connected to the piston end of the injection moving hydraulic cylinder 4032, the first connecting seat is mounted on the injection seat 4031, and the second connecting seat is mounted on the mounting block 4021.

[0034] The cylinder block and piston rod of the injection moving hydraulic cylinder 4032 are both attached to two connecting seats by hinge connections, and the two connecting seats are fixed to the injection seat 4031 and the mounting block 4021, respectively. This allows the injection moving hydraulic cylinder 4032 to be fixedly attached. With this hinge-connected attachment method, for example, if the mounting block 4021 breaks down, the second connecting seat can be removed, and then the injection moving hydraulic cylinder 4032 can be rotated around the piston rod to move away from the mounting block 4021, thereby eliminating interference by the injection moving hydraulic cylinder 4032 when repairing the mounting block 4021. Furthermore, since it is only necessary to remove the cylinder block of the injection moving hydraulic cylinder 4032, this is easy and convenient, and it can significantly improve the efficiency of installing the injection moving hydraulic cylinder 4032 after repair.

[0035] 4 and 5, the entire melting module 4 is installed perpendicular to the die-casting machine body 1, and the melting module 4 is connected and communicated by the injection head 6 abutting against the material extrusion cylinder 302. However, the material extrusion cylinder 302 may shake during long-term extrusion, which may affect the communication and sealing effect between the two.

[0036] To solve the above technical problems, in one embodiment of the present application, as shown in Figures 1 and 4, a pressing mechanism 5 is attached to the die casting machine body 1, which cooperates with the injection module 3 and is arranged in a line corresponding to the melting module 4. In this case, the pressing mechanism 5 can always bring the injection module 3 and the melting module 4 into contact with each other, so that the injection module 3 and the melting module 4 always maintain a sealed state and ensure stable transportation of the magnesium material during the die casting process.

[0037] 4, the pressing mechanism 5 includes a pressing hydraulic cylinder 501 and an extrusion head 502. The pressing hydraulic cylinder 501 is attached to the fixed die plate 2, and the extrusion head 502 is attached to one end of the piston rod of the pressing hydraulic cylinder. During die casting, the pressing hydraulic cylinder 501 extends to bring the extrusion head 502 into contact with the outside of the material extrusion cylinder 302. That is, during injection, the pressing hydraulic cylinder 501 presses the extrusion head 502 to constantly apply pressure to the material extrusion cylinder 302 and act on the injection head 6 and the melting cylinder 401 to seal them, thereby ensuring stable transport of the magnesium material during die casting. Of course, the extension and retraction of the pressing hydraulic cylinder 501 is precisely controlled by a control system to accommodate different pressure requirements at different die casting stages.

[0038] In this embodiment, as shown in FIGS. 5(a) and 5(b), limit rods 7 are provided symmetrically on the upper and lower sides of the fixed die plate 2 to improve the stability of the melting module 4 and facilitate the installation of the press hydraulic cylinder 501. Specifically, connecting rods may be attached to the upper and lower sides of the melting module 4, and the position of the melting module 4 can be limited and locked by fastening the connecting rods to the first ends (left ends) of the limit rods 7. Meanwhile, a vertical plate may be fastened to the second ends (right ends) of the limit rods 7 with bolts, and the press hydraulic cylinder 501 can then be fastened to the vertical plates to lock the press mechanism 5. As can be seen, the provision of a pair of limit rods 7 not only limits and locks the position of the melting module 4, but also locks and installs the press mechanism 5. Furthermore, the alignment of the press mechanism 5 and the melting module 4 can be ensured, thereby ensuring the stability and safety of the entire die casting process.

[0039] 10 to 12, the screw head 9 includes a rod head 901, a blocking portion 902, a check ring 904, a collar 905, and a gasket 903. The rod head 901 is attached to the second end (left end) of the screw 4022 by a screw, allowing the rod head 901 to be quickly attached to and detached from the screw 4022. The blocking portion 902 and the gasket 903 are provided on the outside of the rod head 901 with a gap between them. A plurality of material grooves 10 are provided outside the blocking portion 902. The collar 905 is connected to the outside of the check ring 904 and abuts against the inner wall of the melting cylinder 401. The check ring 904 is connected to the rod head 901 at intervals corresponding to the intervals, and its axial length is shorter than the length of the intervals. Flow paths 11 communicating with the material grooves 10 are formed between the inside of the check ring 904 and the intervals.

[0040] The flow direction of the magnesium material in the melting cylinder 401 is shown in Figure 11(c) (i.e., the direction of the arrow). Because the check ring 904 is movably connected to the rod head 901, the flow force of the magnesium material causes the check ring 904 to abut against the blocking portion 902 on the left side, and a gap 12 is formed between the check ring 904 and the gasket 903 on the right side. In this case, the magnesium material is transported by the screw 4022, and flows from the gap 12, flow path 11, and material groove 10 into the material storage chamber on the left side of the melting cylinder 401, as shown in Figure 8.

[0041] Meanwhile, during injection, as shown in FIG. 9 , the screw head 9 moves to the left due to the action of the screw 4022, injecting the magnesium material from the material reservoir chamber into the injection module 3 via the injection head 6. Of course, during injection, the magnesium material backflows due to the reaction force of the magnesium material. In this case, as shown in FIG. 11(d), the check ring 904 receives this reaction force and abuts against the right-side gasket 903, closing the gap 12. This blocks the magnesium material from backflowing, improving the utilization rate of the magnesium material. Of course, as shown in FIG. 12 , multiple notches may be provided on the right side of the check ring 904. In this way, when the check ring 904 abuts against the gasket 903, the presence of the notches prevents the gap 12 from closing and narrows it. This prevents leakage of the magnesium material from the melting cylinder 401 or the material extrusion cylinder 302 due to excessive force. That is, in this case, the gap 12 not only ensures sufficient injection of the magnesium material, but also buffers the backflow force of the magnesium material, thereby ensuring the smooth progress of the entire die casting process. Of course, regarding the specific setting of the gap 12, whether to narrow or close the gap 12 in the event of backflow can be selected by those skilled in the art according to the actual situation.

[0042] 1, the injection die plate 16 is mounted to the left of the fixed die plate 2, i.e., inside the die-casting machine body 1. However, in actual use, for products with different model numbers, the injection die plate 16 will have a different model number, and the fixed die plate 2 is fixedly mounted, making it inconvenient to replace the injection die plate 16. It is also common technical knowledge for those skilled in the art that a fixed die insert is mounted on the injection die plate 16, and a movable die plate and a movable die insert connected to the movable die plate are mounted in the area corresponding to the injection die plate 16 inside the die-casting machine body 1, and the fixed die insert and the movable die insert are fitted together to form the mold cavity of the die-casting machine (i.e., the mold cavity of the mold).

[0043] Therefore, in order to solve the above technical problems, as shown in Figure 13, the entire die carrier assembly 13 may be attached to a frame within the die casting machine body 1, the fixed die plate 2 may be fixed to the right side of the die carrier assembly 13, a die carrier 14 may be slidably provided within the die carrier assembly 13, and an injection die plate 16 may be attached to the die carrier 14. A pallet hydraulic cylinder 15 is attached to the lower end of the fixed die plate 2, and one end of the piston rod of the pallet hydraulic cylinder 15 is connected to the die carrier 14.

[0044] When the pallet hydraulic cylinders 15 are retracted and the injection die plate 16 is brought close to and in contact with the fixed die plate 2, the attachment of the injection die plate 16 is completed. On the other hand, when removing the injection die plate 16, the pallet hydraulic cylinders 15 are first extended to move the injection die plate 16 away from the fixed die plate 2, and then the injection die plate 16 is removed from the die carrier 14. Compared to the prior art, this is actually a design change from the conventional attachment between the injection die plate 16 and the fixed die plate 2 to an attachment between the injection die plate 16 and the die carrier 14. To facilitate attachment and detachment of the fixed die plate 2 after attachment, the position of the die carrier 14 can be adjusted by the pallet hydraulic cylinders 15.

[0045] The operating principle of the magnesium aluminum dual injection die casting machine according to the present application is as follows.

[0046] First, the user selects the appropriate mode depending on the product to be injection molded. For example, the aluminum alloy injection mode can be selected on the die-casting machine's operation screen. This means that magnesium alloy injection is not required, and the system's preset parameters are suitable for aluminum alloy die-casting. Specifically, molten aluminum melted externally is added to the injection module 3, which then injects the molten aluminum into the die-casting machine to form the molded product.

[0047] On the other hand, when the magnesium alloy injection mode is selected, the magnesium raw material undergoes two processes under the action of the melting module 4. In the first process, as shown in FIG. 8, magnesium particles are introduced into the melting cylinder 401 through the inlet 8 (corresponding to the upper end of the injection seat 4031), and the driver 4023 rotates the screw 4022 to store the material. In this process, the screw 4022 recoils as it extrudes the magnesium particles, and the mounting block 4021 also retracts under the action of the injection hydraulic cylinder 4032. After the storage is complete, the mounting block 4021 returns to its original position under the action of the injection hydraulic cylinder 4032, forcing the semi-molten magnesium in the melting cylinder 401 through the injection head 6 into the material extrusion cylinder 302. Finally, the injection module 3 injects the semi-solid magnesium into the die, completing the entire injection process.

[0048] The material injection cylinder 301, material extrusion cylinder 302, injection nozzle 303, melting cylinder 401, and injection head 6 are all equipped with heating rings that heat the material to a semi-solid state during transport and maintain a constant temperature of the molten magnesium. Compared to conventional cold chamber die casting machines, the present invention significantly reduces the operating temperature, reducing the magnesium content of the product and the system's high power consumption, thereby significantly reducing energy consumption. Furthermore, because the magnesium melting module 4 performs injection in a completely enclosed environment, it does not require the use of SF6 protective gas, reducing costs, improving safety, and achieving environmental protection. Furthermore, by simplifying the injection system and separating the melting and injection components, the magnesium melting module 4 can be easily installed on conventional cold chamber die casting machines, reducing equipment installation and maintenance costs and achieving stable and continuous production.

[0049] The injection operation of a conventional cold chamber die casting machine is divided into three processes: low-speed injection, high-speed injection, and pressure injection. After high-speed injection is completed and before pressure injection is started, the injection hydraulic cylinder 19 must be braked. After the die casting machine completes the injection operation, it must go through a decompression process, a follow-up process, and a plunger return process to return to its initial position. These processes are, of course, well known to those skilled in the art.

[0050] As shown in Figure 14, as is well known, molten metal in the material injection cylinder 301 is injected into the die-casting machine body 1 by the injection plunger. In the case of molten aluminum, since the molten aluminum is only liquid, a low-speed injection process must be performed in the initial stage of injection. This is because high-speed injection in the early stages generates a large thrust force on the molten aluminum, causing waves and even a "surge" that affects the molding quality. On the other hand, after the material injection cylinder 301 is filled with molten aluminum, a high-speed injection process can be performed.

[0051] Therefore, another aspect of the present application provides a magnesium-aluminum dual injection system using the above-mentioned magnesium-aluminum dual injection die casting machine, which includes low-speed injection, high-speed injection, and pressure injection when performing die casting in a first mode (i.e., aluminum alloy), and includes high-speed injection and pressure injection when performing die casting in a second mode (i.e., magnesium alloy).

[0052] Furthermore, because magnesium alloys remain in a semi-solid state after melting, the "surge" phenomenon that occurs with molten aluminum as mentioned above hardly occurs during injection. This eliminates the need for a low-speed injection process in the second mode, simplifying the operation flow and improving production efficiency. In actual operation, the two injection modes share a single injection system. By selecting the corresponding injection mode via the control panel, the system automatically adjusts the corresponding parameters to accommodate the injection needs of different materials.

[0053] 15 to 17, the magnesium-aluminum dual injection system includes an accumulator 18, an injection hydraulic cylinder 19, a pressurizing hydraulic cylinder 17, and a valve module, which are connected via oil passages. In the drawings, thick solid lines indicate open oil passages, and dashed lines indicate closed oil passages. The oil pump is represented by P, and the oil tank is represented by T.

[0054] 15, the valve module includes a switch valve V5, a switch valve V5, a switch valve V8, a servo valve V9, and check valves V11 and V13. The output end of the oil pump is connected to the rod-equipped cavity of the injection hydraulic cylinder 19 via the check valve V11 and the servo valve V9, which are connected in series, to form a first oil passage. The output end of the oil pump is connected to the rodless cavity of the injection hydraulic cylinder 19 via the check valve V11, the check valve V13, the switch valve V8, and the switch valve V5, which are connected in series, to form a second oil passage. During the oil pump-only oil supply stage for low-speed injection, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder 19 via the opened second oil passage, and the first and second oil passages intersect at the output end of the check valve V11 to form a differential circuit. Of course, in this case, the pump and the accumulator 18 can also supply oil together. That is, the accumulator 18 supplies oil to the rodless cavity of the injection hydraulic cylinder 19 via the switch valves V4 and V5, and at the same time, the oil pump can replenish oil to the accumulator 18 via the open switch valve V12.

[0055] Furthermore, by using differential control in the low-speed injection stage, it is possible to ensure the stability of low-speed injection while controlling the flow rate of the rod-equipped cavity of the injection hydraulic cylinder 19 with the servo valve V9, thereby controlling the speed of low-speed injection. Furthermore, with differential control, the differential pressure between before and after the servo valve V9 is smaller than the differential pressure in conventional outlet-only control, so the pressure gain of the servo valve V9 is small, thereby improving the control accuracy of the injection hydraulic cylinder 19. Furthermore, because pressure is already built up in the rod-equipped cavity of the injection hydraulic cylinder 19 during the energy accumulation stage before low-speed injection begins, the amount of compression of the hydraulic fluid in the rod-equipped cavity is reduced when low-speed injection begins, making it possible to prevent or reduce impact at the start of injection.

[0056] As shown in FIG. 16, the valve module further includes a servo valve V7, and the oil tank is connected to the rod-equipped cavity of the injection hydraulic cylinder 19 via the servo valve V7 to form a third oil passage. During high-speed injection and braking, the accumulator 18 supplies oil to the rodless cavity of the injection hydraulic cylinder 19 via the switch valves V4 and V5. At the same time, the pressurized oil in the rod-equipped cavity of the injection hydraulic cylinder 19 flows back to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are connected to form an A-type half-bridge structure, and the opening of the servo valves V7 and V9 is controlled to adjust the injection speed of the injection hydraulic cylinder 19.

[0057] Furthermore, during the high-speed injection phase, the opening of servo valve V7 is large and the opening of servo valve V9 is small, so that the pressurized oil in the rod-equipped cavity of injection hydraulic cylinder 19 can quickly return to the oil tank, achieving a high injection speed. By opening the first oil path during the high-speed injection phase to form an A-type half-bridge structure, the opening of servo valve V9 can be controlled to quickly adjust the flow rate of the rod-equipped cavity of injection hydraulic cylinder 19, thereby accurately controlling the speed and reducing or avoiding the occurrence of high-speed overshoot.

[0058] On the other hand, during the braking phase, the opening of servo valve V7 is small and the opening of servo valve V9 is large, which increases the pressure in the rod-equipped cavity of injection hydraulic cylinder 19 and achieves active braking. Oil supply by the oil pump, through the A-type half-bridge structure, allows pressure to build up more quickly in the rod-equipped cavity of injection hydraulic cylinder 19, achieving active braking with greater deceleration.

[0059] As shown in FIG. 17, the valve module further includes a switch valve V6, the accumulator 18 is connected to the rodless cavity of the pressurized hydraulic cylinder 17 through the switch valve V4 to form a fourth oil passage, the oil tank is connected to the rod-containing cavity of the pressurized hydraulic cylinder 17 through the servo valve V7 and the switch valve V6 connected in series in this order to form a fifth oil passage, and the output end of the oil pump is connected to the rod-containing cavity of the pressurized hydraulic cylinder 17 through the check valve V11, the servo valve V9 and the switch valve V6 connected in series in this order to form a fifth oil passage. The accumulator 18 is connected to the servo valve V9 to form the sixth oil passage, and in the pressurized injection stage, the accumulator 18 supplies oil to the rodless cavity of the pressurized hydraulic cylinder 17 through the fourth oil passage that has been opened, and the pressurized oil in the rod-equipped cavities of the pressurized hydraulic cylinder 17 and the injection hydraulic cylinder 19 flows back into the oil tank through the fifth oil passage and the servo valve V7 that have been opened, respectively. At this time, the sixth oil passage and the fifth oil passage are opened to form an A-type half-bridge structure, and the pressurized pressure of the pressurized hydraulic cylinder is adjusted by controlling the opening of the servo valves V9 and V7.

[0060] The method for accurately controlling the pressurizing pressure using the A-type half-bridge structure is as follows: During the delay phase before pressurization begins, servo valve V7 is opened to a preset fixed aperture, and servo valve V9 is also opened to a preset fixed aperture to allow for faster pressure buildup during the pressurized injection phase. When the pressure in the rodless cavity of the injection hydraulic cylinder 19 reaches a certain percentage of the preset value for the first stage, the aperture of servo valve V7 is reduced to a certain set value. Then, the aperture of servo valve V9 is adjusted to change the flow rate through servo valve V9. The flow rate through servo valve V9 and the flow rate in the rod-equipped cavity of the pressurized hydraulic cylinder 17 generate a pressure drop when flowing through servo valve V7. This pressure drop is the pressure in the rod-equipped cavity of the pressurized hydraulic cylinder 17. The pressurizing pressure can be adjusted by controlling the aperture of servo valve V9, which in turn controls the flow rate and the pressure drop across servo valve V7. According to this control method, the accuracy of adjusting the pressurized pressure is improved, and it is possible to adjust the pressurized pressure from a large pressure to a small pressure, that is, to adjust the pressurized pressure after an overshoot occurs.

[0061] During pressurized injection, the switch valve V12 can be opened, allowing the oil pump to replenish oil to the accumulator 18 via the opened second oil passage. By replenishing oil to the accumulator 18, the pressure in the accumulator 18 can be increased, ensuring sufficient pressure in the accumulator 18 in the subsequent follow-up phase. Furthermore, the injection hydraulic cylinder 19 and the pressurized hydraulic cylinder 17 share a single accumulator 18, allowing pressurization and oil replenishment to the accumulator 18 in both the pressurized injection phase and the low-speed injection phase, thereby further reducing the volume of the accumulator 18 and reducing costs.

[0062] The above has described the basic principles, main features, and advantages of the present application. Those skilled in the art will understand that the present application is not limited to the above embodiments, and that the above embodiments and descriptions in the specification are merely the principles of the present application. Various modifications and improvements to the present application are possible without departing from the spirit and scope of the present application, and all such modifications and improvements are included within the scope of the present application, which is sought to be protected. The scope of protection sought to be protected by the present application is defined by the appended claims and their equivalents. [Explanation of symbols]

[0063] 1 Die-casting machine body 2 Fixed die plate 3 Injection Module 301 Material injection cylinder 302 Material extrusion cylinder 303 Injection Nozzle 4 Melting Module 401 Melting Cylinder 402 Transport mechanism 4021 Mounting block 4022 screw 4023 Drive unit 403 Injection Unit 4031 Injection seat 4032 Injection moving hydraulic cylinder 5 Pressing mechanism 501 Pressing hydraulic cylinder 502 Extrusion Head 6 injection head 7 Limit Rod 8 Inlet 9 screw head 901 Rod Head 902 Breaker 903 Gasket 904 Check ring 905 Color 10 Material groove 11 Flow path 12 Gap 13 Die Carrier Assembly 14 Die Carrier 15 Pallet Hydraulic Cylinder 16 Injection die plate 17 Pressurized hydraulic cylinder 18 Accumulator 19 Pressurized hydraulic cylinder

Claims

1. The die-casting machine body, an injection module attached to a side of the die casting machine body so as to be aligned in a straight line with the die casting machine body; a melting module provided perpendicular to the die-casting machine body so as to be connected to the injection module; When performing die casting in a first mode, the injection module injects the added molten metal in a first form into the die casting machine body to form it; When performing a second mode of die casting, the melting module injects the second type of molten metal into the injection module, and then the injection module injects the second type of molten metal into the die casting machine body to form it; a pressing mechanism is attached to the die-casting machine body, the pressing mechanism cooperating with the injection module and arranged in a straight line corresponding to the melting module; the pressing mechanism abuts the injection module against the melt module so that the injection module and the melt module are maintained in a sealed state; Limit rods are provided in a vertically symmetrical arrangement to penetrate the fixed die plate of the die casting machine body, the melting module engages the first end of the limit rod, thereby limiting and locking the melting module in position; The pressing mechanism is attached by being locked via the second end of the limit rod, the injection module includes a material injection cylinder, a material extrusion cylinder, and an injection nozzle; The material injection cylinder is attached to a fixed die plate of the die casting machine body, and the material extrusion cylinder and the injection nozzle are sequentially connected to an end of the material injection cylinder; The injection nozzle communicates with the mold cavity of the die-casting machine body, and the material extrusion cylinder communicates with the melting module; the pressing mechanism includes a pressing hydraulic cylinder and an extrusion head; The pressing hydraulic cylinder is attached to the fixed die plate, and the extrusion head is attached to one end of a piston rod of the pressing hydraulic cylinder, The pressing hydraulic cylinder abuts the extrusion head against the material extrusion cylinder, and abuts the material extrusion cylinder and the injection head of the melting module to seal them. Magnesium aluminum dual injection die casting machine.

2. the inner diameter of the injection head is smaller than the inner diameter of the material extrusion cylinder; The inner diameter of the injection nozzle is smaller than the gate diameter in the mold cavity.

2. The magnesium aluminum dual injection die casting machine according to claim 1.

3. When performing the first mode die casting, the die casting includes low speed injection, high speed injection, and pressure injection; When performing the second mode die casting, it includes high speed injection and pressure injection. A magnesium-aluminum dual injection system using the magnesium-aluminum dual injection die casting machine according to claim 1 or 2.

4. The magnesium aluminum dual injection system includes an accumulator, an injection hydraulic cylinder, a pressurized hydraulic cylinder, and a valve module, which are connected through an oil passage; The valve module includes a switch valve V5, a switch valve V8, a servo valve V9, and check valves V11 and V13; The output end of the oil pump is connected to the rod-equipped cavity of the injection hydraulic cylinder via the check valve V11 and the servo valve V9, which are connected in series, to form a first oil passage; The output end of the oil pump is connected to the rodless cavity of the injection hydraulic cylinder via the check valve V11, the check valve V13, and the switch valve V5, which are connected in series in this order, to form a second oil passage; In an oil pump only oil supply stage in which low-speed injection is performed, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder through the second oil passage that is conducted, and the first oil passage and the second oil passage form a differential circuit.

4. The magnesium aluminum dual injection system of claim 3.

5. The valve module further includes a servo valve V7; The oil tank is connected to the rod-equipped cavity of the injection hydraulic cylinder via the servo valve V7 to form a third oil passage; During high-speed injection and braking phases, the accumulator supplies oil to the rodless cavity of the injection hydraulic cylinder through the switch valve V4 and the switch valve V5; At the same time, the pressure oil in the rod-equipped cavity of the injection hydraulic cylinder flows back to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are connected to form an A-type half-bridge structure, and the injection speed of the injection hydraulic cylinder is adjusted by controlling the openings of the servo valves V7 and V9.

5. The magnesium aluminum dual injection system of claim 4.

6. The valve module further includes a switch valve V6; The accumulator is connected to the rodless cavity of the pressurized hydraulic cylinder via the switch valve V4 to form a fourth oil passage; The oil tank is connected to the rod-equipped cavity of the pressurized hydraulic cylinder via the servo valve V7 and the switch valve V6, which are connected in series in this order, to form a fifth oil passage; The output end of the oil pump is connected to the rod-containing cavity of the pressurizing hydraulic cylinder via the check valve V11, the servo valve V9, and the switch valve V6, which are connected in series in this order, to form a sixth oil passage; In the pressurized injection stage, the accumulator supplies oil to the rodless cavity of the pressurized hydraulic cylinder through the fourth oil passage that is opened, The pressurized oil in the rod-equipped cavities of the pressurizing hydraulic cylinder and the injection hydraulic cylinder respectively flows back into the oil tank through the connected fifth oil passage and the servo valve V7, At this time, the sixth oil passage and the fifth oil passage are connected to form an A-type half-bridge structure, and the pressurizing pressure of the pressurizing hydraulic cylinder is adjusted by controlling the opening degrees of the servo valves V9 and V7.

6. The magnesium aluminum dual injection system of claim 5.

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