Magnesium-aluminum dual injection die casting machine and injection system

Abstract

We provide a magnesium-aluminum dual injection die-casting machine and injection system. [Solution] The magnesium-aluminum dual injection die-casting machine includes a die-casting machine body, an injection module, and a melting module, wherein the injection module is mounted on the side of the die-casting machine body so as to be aligned linearly with the die-casting machine body, and the melting module is provided 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 magnesium-aluminum dual injection die-casting machine described above.

Description

Technical Field

[0001] This application relates to the technical field of die-casting machines, and particularly to a magnesium-aluminum dual-injection die-casting machine and an injection system.

Background Art

[0002] A die-casting machine is a machine used for die-casting (pressure casting). It includes two types: hot chamber and cold chamber. The latter can also be divided into two types: vertical and horizontal. A die-casting machine injects molten metal into a die under pressure, cools it, and forms it. When the die is opened, a solid metal casting is obtained. It was originally used for die-casting of type characters.

[0003] In die-casting of products, the materials of different products are also different. For example, there are die-castings of aluminum alloys and die-castings of magnesium alloys. In the case of aluminum alloys, the molten metal for die-casting is only liquid. On the other hand, in the case of magnesium alloys, the molten metal for die-casting is in a solid-liquid mixed state. Therefore, for products of these two types of materials, two independent die-casting machines are required, resulting in increased equipment costs and installation areas. For this reason, a magnesium-aluminum dual-injection die-casting machine for solving the above technical problems is proposed.

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] Another object of this application is to provide a magnesium-aluminum dual-injection system.

Means for Solving the Problems

[0006] To achieve the above objective, this application employs the following technical solutions. 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 mounted on the side of the die-casting machine body so as to be arranged in a straight line with the die-casting machine body. The melting module is provided so as to be perpendicular to the die-casting machine body so as to be connected to the injection module. When performing die casting in the first mode, the injection module injects the added molten metal of the first mode into the die casting machine body and forms it. When performing die casting in the second mode, the melting module injects the molten metal of the second form into the injection module, and then the injection module injects the molten metal of the second form into the die-casting machine body for molding.

[0007] Preferably, the die-casting machine body is fitted with a pressing mechanism that cooperates with the injection module and is arranged linearly in correspondence with the melting module. The pressing mechanism brings the injection module into contact with the melting module so that the injection module and the melting module are kept in a sealed state.

[0008] Preferably, limit rods are provided through the fixed die plate of the die-casting machine body, arranged symmetrically vertically. By engaging the first end of the limit rod, the molten module is locked in a restricted position. The pressing mechanism is locked and mounted 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 the fixed die plate of the die-casting machine body. The end of the material injection cylinder is connected in order to the material extrusion cylinder and the injection nozzle. The injection nozzle communicates with the mold cavity of the die-casting machine body, The material extrusion cylinder is in communication with the melting 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 the piston rod of the pressing hydraulic cylinder. The pressing hydraulic cylinder brings the extrusion head into contact with the material extrusion cylinder, and the material extrusion cylinder and the injection head of the melting module into contact and seal.

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

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

[0013] Preferably, the magnesium-aluminum dual injection system includes an accumulator, an injection hydraulic cylinder, a pressurized hydraulic cylinder, and a valve module connected via 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 terminal of the oil pump is connected to the rod cavity of the injection hydraulic cylinder via the check valve V11 and the servo valve V9, which are connected in series in order, to form a first oil passage. The output terminal 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 order, to form a second oil passage. In the oil pump-only lubrication stage for low-speed injection, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder via the conductive second oil passage, 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 cavity of the injection hydraulic cylinder via the servo valve V7 to form a third oil passage. During high-speed injection and braking, the accumulator supplies lubrication to the rodless cavity of the injection hydraulic cylinder via the switch valve V4 and the switch valve V5. At the same time, the pressurized oil in the rod cavity of the injection hydraulic cylinder is returned to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are electrically connected to form an A-type half-bridge structure, and the injection speed of the injection hydraulic cylinder is adjusted by controlling the opening degree 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 cavity of the pressurized hydraulic cylinder via the servo valve V7 and the switch valve V6, which are connected in series in order, to form a fifth oil passage. The output end of the oil pump is connected to the cavity with a rod of the pressurized hydraulic cylinder via the check valve V11, the servo valve V9, and the switch valve V6 connected in series in sequence to form a sixth oil passage. In the pressurized injection stage, the accumulator supplies oil to the cavity without a rod of the pressurized hydraulic cylinder via the fourth oil passage that is conducting. The pressure oil in the cavities with rods of the pressurized hydraulic cylinder and the injection hydraulic cylinder respectively flows back into the oil tank through the conducting fifth oil passage and the servo valve V7. At this time, the sixth oil passage and the fifth oil passage are conducting to form an A-type half-bridge structure, and the pressurizing pressure of the pressurized hydraulic cylinder is adjusted by controlling the opening degrees of the servo valve V9 and the servo valve V7.

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

[0017] (1) According to the present application, by attaching a magnesium melting module to a conventional cold chamber die casting machine, two modes of injection of magnesium alloy and injection of aluminum alloy are realized. Thereby, two different forms of molten metal can be used in one die casting machine. Thus, since there is no need to use two die casting machines, the equipment cost and the occupied space are significantly reduced.

[0018] (2) According to the present application, by sharing one injection system for a special injection system, that is, a magnesium-aluminum dual injection mode, especially in the case of a semi-solid magnesium material, there is no low-speed injection stage in the die casting machine. That is, since the oil passage does not perform differential movement and immediately enters the high-speed stage when the energy accumulation is completed, the operation flow is simplified and the production efficiency is improved.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic diagram of the overall structure of the present application. [Figure 2] This is a schematic diagram of a partial structure of the present invention. [Figure 3] This is a schematic diagram of the cross-sectional structure of Figure 2 of the present application. [Figure 4] This is an enlarged schematic diagram of the structure of A in the present application. [Figure 5] This is a schematic diagram of the mounting structure of the melting module, injection module, and pressing mechanism of the present invention. [Figure 6] This is a schematic diagram of the overall structure of the molten module of the present invention. [Figure 7] This is a schematic diagram of the specific structure of the molten module of the present invention. [Figure 8] This is a schematic diagram illustrating the principle of injection and transport of magnesium particles according to the present invention. [Figure 9] This is a schematic diagram illustrating the principle of melting and then injecting magnesium particles according to the present invention. [Figure 10] This is a schematic diagram of the screw structure of the present invention. [Figure 11] This is a schematic diagram illustrating the principle of the magnesium material flow in the present invention as it passes through the screw head and as it flows in reverse. [Figure 12] This is a schematic diagram illustrating the specific structure of the screw head of the present invention. [Figure 13] This figure shows the die carrier assembly of the present invention. [Figure 14] This figure shows the die-casting solution metal positioned inside the material injection cylinder. [Figure 15] A schematic diagram illustrating the operating principle of low-speed injection according to the present invention. [Figure 16] A schematic diagram illustrating the operating principle of high-speed injection according to the present invention. [Figure 17] This is a schematic diagram illustrating the operating principle of pressurized injection according to the present invention. [Modes for carrying out the invention]

[0020] The present application will be further described below in relation to specific embodiments. In addition, new embodiments can be created by arbitrarily combining the embodiments or technical features described below, as long as they do not contradict each other.

[0021] Furthermore, in the description of this application, the directions or positional relationships indicated by directional terms such as "center," "horizontal direction," "vertical direction," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," and "counterclockwise" are directions or positional relationships shown based on the drawings, and are solely for the convenience and simplification of the description of this application. They do not imply or suggest that the devices or elements shown must necessarily have a specific direction, or must be configured or operated in a specific direction, and should not be understood as limitations on the specific scope of protection of this application.

[0022] Furthermore, terms such as "First," "Second," etc., in the specification and claims of this application are used to distinguish similar subjects and are not necessarily intended to describe a specific order or sequence.

[0023] In one preferred embodiment of the present invention, as shown in Figures 1 to 17, the magnesium-aluminum dual injection die-casting machine includes a die-casting machine body 1, an injection module 3, and a melting module 4, of which the injection module 3 is mounted on the side of the die-casting machine body 1 so as to be aligned linearly with the die-casting machine body 1, and the melting module 4 is provided perpendicular to the die-casting machine body 1 so as to be connected to the injection module 3.

[0024] This die-casting machine has two die-casting modes during use. When performing die-casting in the first mode, the injection module 3 can inject the added molten metal in the first form into the die-casting machine body 1 for molding. On the other hand, when performing die-casting in the second mode, the molten module 4 can first inject the molten metal in the second form into the injection module 3, and then the injection module 3 can inject the molten metal in the second form into the die-casting machine body 1 for molding. This allows two different forms of molten metal to be used in a single die-casting machine, eliminating the need for two die-casting machines, thus reducing equipment costs and saving space.

[0025] Specifically, in the present invention, 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, production by hot chamber die casting is impossible due to the high melting point of aluminum alloy, and only cold chamber die casting is possible. That is, the aluminum alloy is melted outside the machine, the molten metal of the first form (i.e., molten aluminum) is added to the injection module 3, and the injection module 3 injects the first molten metal into the die casting machine. On the other hand, when performing die casting in the second mode (magnesium alloy), the molten metal of the second form (i.e., molten magnesium) is first added to the injection module 3 by the melting module 4, and then the injection module 3 injects the molten metal of the second form into the die casting machine. In other words, since the two forms of molten metal share one injection module 3 during die casting, two different die casting modes can be flexibly realized.

[0026] Further explanation of the above embodiment is provided. As shown in Figure 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 in order 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, and the material extrusion cylinder 302 is connected to the melting module 4. The melting module 4 transports the molten metal in the second form to the material extrusion cylinder 302 and sends it into the material injection cylinder 301. Next, the injection plunger in the injection module 3 injects the molten metal in the second form into the die-casting machine. The method by which the injection module 3 injects the molten metal in the material injection cylinder 301 into the die-casting machine is common technical knowledge to those skilled in the art, so a detailed explanation is omitted.

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

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

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

[0030] As shown in Figure 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 having a structure similar to a screw feeder, and the material can be transported by the rotation of the screw 4022. The mounting block 4021 is mounted on a workbench so as to be horizontally slidable (as shown in Figure 2, the entire melting module 4 is mounted on the workbench), the drive unit 4023 is attached to the mounting block 4021, the screw 4022 is located inside the melting cylinder 401, the first end (right end) of the screw 4022 is rotatably provided 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 in the axial direction. The mounting block 4021 is connected to the injection unit 403.

[0031] When performing the first step, as shown in Figure 8, that is, when transporting magnesium particles, the drive unit 4023 rotates the screw 4022 and further transports the magnesium particles that have entered through the inlet 8 of the molten cylinder 401, distributing them within the molten cylinder 401. This closes the inlet 8, ensuring the airtightness of the molten cylinder 401 and preventing contact with the outside air. As is well known, when the screw 4022 provides transport force to the magnesium particles, the magnesium particles also provide a reaction force to the screw 4022, causing the screw 4022 to move away from the molten cylinder 401 due to this reaction force. Of course, at the same time, the injection module 3 also moves away from the mounting block 4021 from the molten cylinder 401, so the drive unit 4023 also moves away so as not to interfere with the movement of the screw 4022. The backward movement of the screw 4022 in this step is in preparation for the injection of magnesium material in the second step.

[0032] On the other hand, when performing the second step, as shown in Figure 9, the injection unit 403 returns the mounting block 4021 to its original position and brings it closer to the molten cylinder 401. That is, the screw 4022 moves into the molten cylinder 401 by the drive unit 4023, and as it moves, the screw head 9 at the second end (left end) of the screw 4022 injects the magnesium material into the injection head 6, and then injects it from the injection head 6 into the injection module 3.

[0033] Further description of the above embodiment, as shown in Figure 9, the injection unit 403 includes an injection seat 4031 and an injection-moving hydraulic cylinder 4032. The injection seat 4031 is mounted on a workbench corresponding to a mounting block 4021. The melting cylinder 401 is fixed to the injection seat 4031. A first connecting seat is hinged to the cylinder body of the injection-moving hydraulic cylinder 4032. A second connecting seat is hinged to the piston end of the injection-moving hydraulic cylinder 4032. The first connecting seat is attached to the injection seat 4031, and the second connecting seat is attached to the mounting block 4021.

[0034] Furthermore, both the cylinder block and piston rod portions of the injection-moving hydraulic cylinder 4032 are 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 enables the fixed mounting of the injection-moving hydraulic cylinder 4032. With this hinge connection mounting method, for example, if the mounting block 4021 fails, the second connecting seat can be removed, and then the injection-moving hydraulic cylinder 4032 can be rotated around the piston rod to separate it from the mounting block 4021, thereby eliminating interference caused by the injection-moving hydraulic cylinder 4032 during repair of the mounting block 4021. In addition, since only the cylinder block portion of the injection-moving hydraulic cylinder 4032 needs to be removed, it is easy and convenient, and the efficiency of installing the injection-moving hydraulic cylinder 4032 after repair can be greatly improved.

[0035] As shown in Figures 4 and 5, the entire melting module 4 is positioned perpendicular to the die-casting machine body 1, and the melting module 4 is connected and communicates with the material extrusion cylinder 302 by the injection head 6 coming into contact with it. On the other hand, the material extrusion cylinder 302 may vibrate during long-term extrusion, which could affect the communication and sealing effect between the two.

[0036] To solve the above technical problems, in one embodiment of the present invention, 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 linearly in correspondence with 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 are always in a sealed state, and stable transport of magnesium material in the die-casting process can be guaranteed.

[0037] Specifically, as shown in Figure 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. When die casting is performed, the pressing hydraulic cylinder 501 extends, bringing the extrusion head 502 into contact with the outside of the material extrusion cylinder 302. That is, during injection, the pressing hydraulic cylinder 501 pushes the extrusion head 502, constantly applying pressure to the material extrusion cylinder 302 and acting on the injection head 6 and molten cylinder 401 to seal them, thereby ensuring stable transport of magnesium material during die casting. Of course, the extension and retraction of the pressing hydraulic cylinder 501 is precisely controlled by the control system to respond to the different pressure requirements at different die casting stages.

[0038] In this embodiment, as shown in Figures 5(a) and 5(b), limit rods 7 are provided through the fixed die plate 2, arranged symmetrically vertically, to improve the stability of attachment to the molten module 4 and to facilitate the attachment of the pressing hydraulic cylinder 501. Specifically, connecting rods may be attached to both the upper and lower sides of the molten module 4, and by fixing the connecting rods to the first end (left end) of the limit rod 7, the position of the molten module 4 can be restricted and locked. On the other hand, a vertical plate may be fixed to the second end (right end) of the limit rod 7 with a bolt, and then by fixing the pressing hydraulic cylinder 501 to the vertical plate, the pressing mechanism 5 can be locked. As can be seen from this, by providing a pair of limit rods 7, not only can the position of the molten module 4 be restricted and locked, but the locking and attachment of the pressing mechanism 5 can also be achieved, and the alignment of the pressing mechanism 5 and the molten module 4 in a straight line can be guaranteed, thus guaranteeing the stability and safety of the entire die-casting process.

[0039] In one embodiment of the present invention, as shown in Figures 10 to 12, the screw head 9 includes a rod head 901, a shut-off section 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 for quick attachment and detachment of the rod head 901 and the screw 4022. The shut-off section 902 and the gasket 903 are spaced apart and located on the outside of the rod head 901. Multiple material grooves 10 are provided on the outside of the shut-off section 902. The collar 905 is connected to the outside of the check ring 904 and contacts the inner wall of the molten cylinder 401. The check ring 904 is connected to the rod head 901 in accordance with the spacing, and its axial length is smaller than the length of the spacing. A flow path 11 communicating with the material grooves 10 is formed between the inside of the check ring 904 and the spacing.

[0040] The flow direction of the magnesium material in the molten 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 contact the left-side shutoff section 902, forming a gap 12 between the check ring 904 and the right-side gasket 903. In this case, the magnesium material on the right side of the molten cylinder 401, transported by the screw 4022, flows from the gap 12, the flow path 11, and the material groove 10 into the material storage chamber on the left side of the molten cylinder 401, as shown in Figure 8.

[0041] On the other hand, during injection, as shown in Figure 9, the screw head 9 moves to the left due to the action of the screw 4022, injecting the magnesium material in the material storage chamber into the injection module 3 from the injection head 6. Of course, during injection, the magnesium material flows back due to the reaction force of the magnesium material. As shown in Figure 11(d), in this case, the check ring 904 receives this reaction force and comes into contact with the gasket 903 on the right side, closing the gap 12, blocking the magnesium material from flowing back, and improving the utilization rate of the magnesium material. Of course, as shown in Figure 12, multiple notches may be provided on the right side of the check ring 904. In this way, when the check ring 904 comes into contact with the gasket 903, the gap 12 is not closed but becomes smaller due to the presence of the notches. This prevents leakage from the molten cylinder 401 or the material extrusion cylinder 302 due to excessive force of the magnesium material. In other words, in this case, the gap 12 ensures sufficient injection of magnesium material while also buffering the backflow force of the magnesium material, thus ensuring the smooth progress of the entire die-casting process. Of course, regarding the specific setting of the gap 12, whether to reduce the gap 12 or close it in the event of backflow can be selected by those skilled in the art according to the actual situation.

[0042] In this embodiment, as shown in Figure 1, the injection die plate 16 is mounted to the left of the fixed die plate 2, that is, inside the die-casting machine body 1. However, in actual use, different product models require different injection die plate 16 model numbers, and since the fixed die plate 2 is permanently mounted, replacing the injection die plate 16 is inconvenient. It is also common technical knowledge to those skilled in the art that a fixed die insert can be attached to the injection die plate 16, and a movable die plate and a movable die insert connected to the movable die plate can be mounted in the area corresponding to the injection die plate 16 inside the die-casting machine body 1, and the mold cavity of the die-casting machine (i.e., the mold cavity of the mold) can be formed by the fitting of the fixed die insert and the movable die insert.

[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 the frame inside the die casting machine body 1, the fixed die plate 2 may be fixed to the right position of the die carrier assembly 13, the die carrier 14 may be slidably provided inside the die carrier assembly 13, and the injection die plate 16 may be attached on top of 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] Furthermore, when the pallet hydraulic cylinder 15 is retracted and the injection die plate 16 is brought close to and in contact with the fixed die plate 2, the installation of the injection die plate 16 is completed. On the other hand, when removing it, first the pallet hydraulic cylinder 15 is 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 conventional technology, in practice, the installation between the conventional injection die plate 16 and the fixed die plate 2 has been redesigned to be installed between the injection die plate 16 and the die carrier 14. To facilitate the attachment and detachment of the fixed die plate 2 after installation, the position of the die carrier 14 can be adjusted using the pallet hydraulic cylinder 15.

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

[0046] First, the user selects the appropriate mode depending on the product to be injection molded. For example, if the user selects the aluminum alloy injection mode on the die-casting machine's operation screen, meaning there is no need to use magnesium alloy injection, the system's preset parameters will be suitable for aluminum alloy die-casting. Specifically, molten aluminum, which has been melted externally, is added to the injection module 3, and then the injection module 3 injects the molten aluminum into the die-casting machine for molding.

[0047] On the other hand, when the magnesium alloy injection mode is activated, the magnesium raw material undergoes two processes due to the action of the molten module 4. In the first process, as shown in Figure 8, magnesium particles are introduced into the inlet 8 of the molten cylinder 401 (corresponding to the upper end of the injection seat 4031), and the drive unit 4023 rotates the screw 4022 to store the material. In this case, the screw 4022 retracts due to the recoil as it pushes out the magnesium particles, and the mounting block 4021 also retracts due to the action of the injection movement hydraulic cylinder 4032. After storage is complete, the mounting block 4021 returns to its original position and moves forward due to the action of the injection movement hydraulic cylinder 4032, pushing the semi-molten magnesium in the molten cylinder 401 from the injection head 6 into the material extrusion cylinder 302, and finally, the semi-solid magnesium is injected into the die using the injection module 3 to complete the entire injection flow.

[0048] Furthermore, the material injection cylinder 301, material extrusion cylinder 302, injection nozzle 303, molten cylinder 401, and injection head 6 are all equipped with heating rings on their exteriors to heat the material to a semi-solid state during transport and to maintain a constant temperature of molten magnesium. Compared to conventional cold chamber die casting machines, this invention significantly reduces energy consumption by lowering the operating temperature and reducing the magnesium content of the cast products and the high power consumption of the system. In addition, since the magnesium molten module 4 is injected in a completely closed environment, there is no need to use SF6 protective gas, which reduces costs, enhances safety, and achieves environmental protection. Moreover, by simplifying the injection system and separating the molten structure from the injection structure, the magnesium molten module 4 can be easily installed on conventional cold chamber die casting machines, reducing the cost of equipment installation and maintenance, and enabling 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 pressurized injection. Here, after high-speed injection is completed and before preparing for pressurized injection, it is necessary to brake the injection hydraulic cylinder 19. After the die-casting machine has completed the injection operation, a depressurization process, a follow-up process, and a plunger return process are necessary to return to the initial position, but of course, these are also common technical knowledge to those skilled in the art.

[0050] As shown in Figure 14, as is well known, the molten metal in the material injection cylinder 301 is injected into the die-casting machine body 1 by an injection plunger. In the case of molten aluminum, since molten aluminum is only a liquid, a low-speed injection process is necessary in the initial stages of injection. This is because if high-speed injection is performed in the preceding stage, a large thrust will be generated in the molten aluminum, causing it to ripple and generating a "surge," which will affect the molding quality. On the other hand, a high-speed injection process can be performed after the molten aluminum has filled the material injection cylinder 301.

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

[0052] Furthermore, since magnesium alloys are semi-solid after melting, the "surge" phenomenon that occurs with molten aluminum during propulsion is almost nonexistent. 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. When the corresponding injection mode is selected via the control panel, the system automatically adjusts the corresponding parameters to adapt to the injection demands of different materials.

[0053] Further explanation of the die-casting steps described above, as shown in Figures 15-17, the magnesium-aluminum dual injection system includes an accumulator 18, an injection hydraulic cylinder 19, a pressurizing hydraulic cylinder 17, and a valve module connected via oil passages. In the figures, thick solid lines indicate conductive oil passages, and dashed lines indicate non-conductive oil passages. The oil pump is denoted by P, and the oil tank by T.

[0054] Specifically, as shown in Figure 15, the valve module includes switch valve V5, switch valve V5, switch valve V8, servo valve V9, and check valves V11 and V13. The output terminal of the oil pump is connected to the rod-bearing cavity of the injection hydraulic cylinder 19 via check valve V11 and servo valve V9, which are connected in series in order, to form a first oil passage. The output terminal of the oil pump is connected to the rodless cavity of the injection hydraulic cylinder 19 via check valve V11, check valve V13, switch valve V8, and switch valve V5, which are connected in series in order, to form a second oil passage. In the oil pump-only lubrication stage for low-speed injection, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder 19 via the conductive second oil passage, and the first and second oil passages intersect at the output terminal of check valve V11 to form a differential circuit. Of course, in this case, the pump and accumulator 18 can jointly supply oil. In other words, the accumulator 18 supplies oil to the rodless cavity of the injection hydraulic cylinder 19 via switch valves V4 and V5, while the oil pump can replenish oil in the accumulator 18 via the conductive switch valve V12.

[0055] Furthermore, by using differential control during the low-speed injection phase, the stability of low-speed injection can be ensured, and the injection speed can be controlled by controlling the flow rate of the rod cavity of the injection hydraulic cylinder 19 with the servo valve V9. In addition, in the case of differential control, the differential pressure before and after the servo valve V9 is smaller than the differential pressure in the case of conventional outlet-only control, so the pressure gain of the servo valve V9 is small, which improves the control accuracy of the injection hydraulic cylinder 19. Moreover, since pressure is already formed in the rod cavity of the injection hydraulic cylinder 19 during the energy storage phase before low-speed injection begins, the amount of compression of the oil liquid in the rod cavity is reduced at the start of low-speed injection, which can prevent or reduce the impact at the start of injection.

[0056] As shown in Figure 16, the valve module further includes a servo valve V7, and the oil tank is connected to the rod-bearing 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 switch valves V4 and V5. At the same time, the pressurized oil in the rod-bearing cavity of the injection hydraulic cylinder 19 is returned to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are conductive to form an A-type half-bridge structure, and the injection speed of the injection hydraulic cylinder 19 is adjusted by controlling the opening of the servo valves V7 and V9.

[0057] Furthermore, during the high-speed injection stage, the opening of servo valve V7 is large and the opening of servo valve V9 is small, allowing the pressurized oil in the rod-equipped cavity of the injection hydraulic cylinder 19 to quickly recirculate to the oil tank, thereby achieving a high injection speed. By opening the first oil passage during the high-speed injection stage to form an A-type half-bridge structure, the opening of servo valve V9 can be controlled to quickly adjust the flow rate in the rod-equipped cavity of the injection hydraulic cylinder 19, thereby precisely controlling the speed and reducing or avoiding 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 cavity of the injection hydraulic cylinder 19 and enables active braking. Lubrication by the oil pump, using the A-type half-bridge structure, allows pressure to be formed more quickly in the rod cavity of the injection hydraulic cylinder 19, enabling active braking with greater deceleration.

[0059] As shown in Figure 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 via a switch valve V4 to form a fourth oil passage, the oil tank is connected to the rod-bearing cavity of the pressurized hydraulic cylinder 17 via a servo valve V7 and a switch valve V6 connected in series in order to form a fifth oil passage, and the output end of the oil pump is connected to the rod-bearing cavity of the pressurized hydraulic cylinder via a check valve V11, a servo valve V9, and a switch valve V6 connected in series in order The accumulator 18 is connected to form a sixth oil passage, and during the pressurized injection stage, it supplies oil to the rodless cavity of the pressurized hydraulic cylinder 17 via the conductive fourth oil passage. The pressurized oil in the rod-bearing cavities of the pressurized hydraulic cylinder 17 and the injection hydraulic cylinder 19 is returned to the oil tank via the conductive fifth oil passage and servo valve V7, respectively. At this time, the sixth oil passage and the fifth oil passage are connected 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 valve V9 and servo valve V7.

[0060] The method for precisely controlling the pressurizing pressure using the Type A half-bridge structure is as follows: In the delay phase before pressurization begins, in order to form pressure more quickly in the pressurizing injection phase, servo valve V7 is opened to a preset fixed opening, and servo valve V9 is also opened to a preset fixed opening. When the pressure in the rodless cavity of the injection hydraulic cylinder 19 reaches a certain percentage of the preset value in the first stage, the opening of servo valve V7 is reduced to a certain set value. Then, the opening 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 pressurizing 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 pressurizing hydraulic cylinder 17, and the pressurizing pressure can be adjusted by controlling the pressure in the rod-equipped cavity of the pressurizing hydraulic cylinder 17. Therefore, the magnitude of the flow rate can be controlled by adjusting the opening of servo valve V9, and the pressurizing pressure can be controlled by controlling the pressure drop of servo valve V7. This control method allows for higher precision in adjusting the pressurized pressure, enabling adjustment from a high pressurized pressure to a low pressurized pressure, that is, adjustment of the pressurized pressure after an overshoot has occurred.

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

[0062] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art will understand that this application is not limited to the above embodiments, that the above embodiments and descriptions in the specification only represent the principles of this application, and that various modifications and improvements to this application are possible without departing from the gist and scope of this application, and that all such modifications and improvements fall within the scope for which protection is sought. The scope for which protection is sought is defined by the attached claims and 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 Transfer Hydraulic Cylinder 5 Pressing mechanism 501 Press Hydraulic Cylinder 502 Extrusion head 6 injection heads 7 Limit Rods 8 Inlet 9 Screw head 901 Rod Head 902 Interruption section 903 Gasket 904 Check Ring 905 Color 10 Material groove 11 channels 12 gaps 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 and An injection module is attached to the side of the die-casting machine body so as to be arranged in a straight line with the die-casting machine body, It includes a melting module that is positioned perpendicular to the die-casting machine body so as to be connected to the injection module, When performing die casting in the first mode, the injection module injects the added molten metal of the first form into the die-casting machine body and forms it. When performing die casting in the second mode, the melting module injects the molten metal of the second form into the injection module, and then the injection module injects the molten metal of the second form into the die casting machine body for molding. The die-casting machine body is fitted with a pressing mechanism that cooperates with the injection module and is arranged linearly in correspondence with the melting module. The pressing mechanism brings the injection module into contact with the melting module so that the injection module and the melting module are kept in a sealed state. Within the fixed die plate of the die-casting machine body, limit rods are provided, arranged symmetrically vertically. By engaging the first end of the limit rod, the molten module is locked in a restricted position. The pressing mechanism is locked and mounted 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 the fixed die plate of the die-casting machine body, and the material extrusion cylinder and the injection nozzle are connected in order to the 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 the piston rod of the pressing hydraulic cylinder. The pressing hydraulic cylinder brings the extrusion head into contact with the material extrusion cylinder, and brings the material extrusion cylinder and the injection head of the melting module into contact and seal them. Magnesium-aluminum dual injection die-casting machine.

2. The internal diameter of the injection head is smaller than the internal diameter of the material extrusion cylinder. The internal diameter of the injection nozzle is smaller than the gate diameter in the mold cavity. The magnesium-aluminum dual injection die-casting machine according to claim 1.

3. When performing die casting in the first mode, this includes low-speed injection, high-speed injection, and pressurized injection. When performing die casting in the second mode, including high-speed injection and pressurized 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 connected via 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 terminal of the oil pump is connected to the rod cavity of the injection hydraulic cylinder via the check valve V11 and the servo valve V9, which are connected in series in order, to form a first oil passage. The output terminal 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 order, to form a second oil passage. In the oil pump-only lubrication stage for low-speed injection, the oil pump supplies oil to the rodless cavity of the injection hydraulic cylinder via the conductive second oil passage, and the first oil passage and the second oil passage form a differential circuit. The magnesium-aluminum dual injection system according to claim 3.

5. The valve module further includes a servo valve V7, The oil tank is connected to the rod cavity of the injection hydraulic cylinder via the servo valve V7 to form a third oil passage. During high-speed injection and braking, the accumulator supplies lubrication to the rodless cavity of the injection hydraulic cylinder via the switch valve V4 and the switch valve V5. At the same time, the pressurized oil in the rod cavity of the injection hydraulic cylinder is returned to the oil tank through the servo valve V7. At this time, the first oil passage and the third oil passage are electrically 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. The magnesium-aluminum dual injection system according to 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 cavity of the pressurized hydraulic cylinder via the servo valve V7 and the switch valve V6, which are connected in series in order, to form a fifth oil passage. The output terminal of the oil pump is connected to the rod 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 order, to form a sixth oil passage. During the pressurized injection stage, the accumulator supplies oil to the rodless cavity of the pressurized hydraulic cylinder via the conductive fourth oil passage. The pressurized oil in the rod-containing cavities of the pressurized hydraulic cylinder and the injection hydraulic cylinder is recirculated into the oil tank through the conductive fifth oil passage and the servo valve V7, respectively. At this time, the sixth oil passage and the fifth oil passage are electrically connected to form an A-type half-bridge structure, and the pressurized pressure of the pressurized hydraulic cylinder is adjusted by controlling the opening degree of the servo valve V9 and the servo valve V7. The magnesium-aluminum dual injection system according to claim 5.

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