Magnesium-based composite material forming apparatus

Abstract

The utility model discloses a kind of magnesium-based composite material forming equipment, it is related to composite material preparation technical field, including material pipe, main feeding mechanism, auxiliary feeding mechanism, heating assembly and main push assembly;Material pipe front end is communicated with the forming cavity of die casting mould, and the length direction of material pipe is spaced and provided with at least two feeding positions;Main feeding mechanism is fed into magnesium alloy matrix to material pipe rear end;Auxiliary feeding mechanism is movably arranged and is fed into the inner cavity of material pipe with carbon fiber powder in any one feeding position;Main push assembly is used to push magnesium alloy matrix forward, so that magnesium alloy matrix is melted to form semi-solid slurry under the heating action of heating assembly, and mixed with carbon fiber powder to form semi-solid composite slurry, then semi-solid composite slurry is pushed forward to the forming cavity and is die casting formed.This scheme can control the interface reaction degree of carbon fiber and magnesium alloy matrix, effectively avoid the generation of harmful interface, so as to obtain ideal interface bonding effect.

Description

Technical Field

[0001] This utility model relates to the field of composite material preparation technology, and in particular to a magnesium-based composite material molding equipment. Background Technology

[0002] Magnesium-based composite materials are novel materials made by adding reinforcing phases (such as ceramic particles and carbon fibers) to magnesium or magnesium alloys as the matrix. They possess excellent properties such as lightweight, high specific strength, and high specific stiffness, and are widely used in aerospace, automotive, and electronics industries. In aerospace, they effectively reduce aircraft weight and improve fuel efficiency, making them suitable for fuselage structures and engine components. In the automotive industry, they help reduce energy consumption and emissions, aligning with green manufacturing trends, and are commonly used in engine blocks and wheel hubs. In electronics, their excellent thermal conductivity and electromagnetic shielding properties make them ideal for electronic device housings and heat dissipation materials.

[0003] Carbon fiber reinforced magnesium matrix composites are high-performance magnesium matrix composites prepared by adding carbon fibers to magnesium or magnesium alloys as the matrix. These composites have a low density (1.74 g / cm³). 3 With its excellent mechanical properties and good thermoelectric properties, magnesium has broad application potential in aerospace, automotive lightweighting, and heat dissipation of electronic devices. The addition of carbon fiber significantly improves the tensile strength, elastic modulus, and wear resistance of the magnesium matrix, while maintaining the good damping properties of magnesium alloys, making it suitable for components subjected to dynamic loads.

[0004] However, this composite material still faces many challenges in industrial applications. First, the interfacial bonding between the magnesium matrix and carbon fibers is weak, easily leading to interfacial debonding and affecting performance. Although this can be improved through surface coatings or interfacial modification, the degree of interfacial reaction is still difficult to control, and excessive reaction can easily produce harmful interfaces. Second, uniform dispersion of carbon fibers in the magnesium matrix is ​​difficult, and oxidation or interfacial reactions easily occur during high-temperature preparation, leading to performance degradation. Finally, existing magnesium-based composite material preparation processes (such as powder metallurgy and stir casting) are inefficient and costly, masking the price advantage of magnesium alloys and posing certain safety risks, hindering large-scale promotion. In conclusion, although carbon fiber reinforced magnesium matrix composites have significant performance advantages, further breakthroughs are needed in interfacial bonding and preparation processes to achieve wider industrial applications. Utility Model Content

[0005] The main purpose of this invention is to propose a magnesium-based composite material molding device, which aims to solve the technical problems of existing magnesium-based composite material preparation technology, which is difficult to effectively control the interfacial reaction to obtain the ideal interfacial bonding effect, and has low preparation process efficiency, high cost, and safety risks, making it difficult to achieve large-scale industrial application.

[0006] To achieve the above objectives, the magnesium-based composite material molding equipment proposed in this utility model includes:

[0007] The material tube has its front end connected to the forming cavity of the die-casting mold, and at least two feeding positions are spaced apart along the length of the material tube;

[0008] The main feeding mechanism is used to feed the magnesium alloy matrix into the rear end of the feed tube;

[0009] A secondary feeding mechanism is movably disposed along the length of the feed tube, and the secondary feeding mechanism is used to feed carbon fiber powder into the inner cavity of the feed tube at any of the feeding positions;

[0010] A heating assembly for heating the inner cavity of the feed tube;

[0011] The main pushing component is disposed inside the feed tube; the main pushing component is used to push the magnesium alloy matrix supplied by the main feeding mechanism forward, so that the magnesium alloy matrix melts under the heating action of the heating component to form a semi-solid slurry, and mixes with the carbon fiber powder supplied by the auxiliary feeding mechanism to form a semi-solid composite slurry; the main pushing component is also used to further push the mixed semi-solid composite slurry forward into the forming cavity for die casting.

[0012] In one embodiment, the main pushing component includes a main screw and a main driving device. The main screw is disposed in the inner cavity of the feed tube, and the main driving device is connected to the main screw. The main driving device is used to drive the main screw to rotate, thereby pushing the magnesium alloy substrate supplied by the main feeding mechanism forward.

[0013] In one embodiment, the front end of the feed tube is provided with a storage bin; the main push assembly further includes an injection drive device, which is connected to the main screw; when the semi-solid composite slurry formed by mixing enters the storage bin under the drive of the rotating main screw, the injection drive device is used to drive the main screw to move forward so as to squeeze the semi-solid composite slurry in the storage bin into the molding cavity.

[0014] In one embodiment, the magnesium-based composite material molding equipment further includes a secondary pushing component; the secondary pushing component is used to push the carbon fiber powder supplied by the secondary feeding mechanism into the inner cavity of the feed pipe, so that the carbon fiber powder mixes with the semi-solid slurry in the feed pipe to form a semi-solid composite slurry.

[0015] In one embodiment, the secondary push assembly includes a secondary screw and a secondary drive device. The secondary screw is disposed in the secondary feeding mechanism, and the secondary drive device is connected to the secondary screw. The secondary drive device is used to drive the secondary screw to rotate, so as to drive the carbon fiber powder supplied by the secondary feeding mechanism into the inner cavity of the feed tube.

[0016] In one embodiment, the main feeding mechanism is configured as a main hopper, which has a funnel-shaped structure.

[0017] In one embodiment, the auxiliary feeding mechanism is configured as an auxiliary hopper, which has a funnel-shaped structure.

[0018] In one embodiment, the heating assembly includes a plurality of heating units, which are arranged at intervals along the length of the feed tube.

[0019] In one embodiment, the magnesium-based composite material molding equipment further includes a guide rail that passes sequentially through each of the feeding positions; the auxiliary feeding mechanism is slidably coupled to the guide rail to move to any of the feeding positions.

[0020] In one embodiment, the secondary feeding mechanism is used to feed nickel-plated carbon fiber into the inner cavity of the feed tube at any of the feeding positions.

[0021] The magnesium-based composite material molding equipment and corresponding preparation technology provided by this utility model have significant advantages over existing magnesium-based composite material preparation technologies. Firstly, this solution enables continuous, stable, and efficient preparation of magnesium-based composite materials, offering higher efficiency, simpler processes, lower costs, and higher safety compared to the intermittent, furnace-based production mode of powder metallurgy, allowing for rapid mass production. Secondly, the composite material prepared by this solution exhibits good carbon fiber dispersion without any agglomeration, effectively improving the mechanical properties of the composite material. Finally, by adjusting the position of the auxiliary feeding mechanism, the addition time of the carbon fibers can be easily controlled, thereby flexibly controlling the contact timing and reaction time between the carbon fibers and the magnesium alloy matrix, ultimately controlling the degree of interfacial reaction (thickness of the reaction interface), effectively avoiding the formation of harmful interfaces, and thus achieving an ideal interfacial bonding effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the structure of the magnesium-based composite material molding equipment provided by this utility model;

[0024] Figure 2 A schematic diagram of the preparation process corresponding to the magnesium-based composite material molding equipment provided by this utility model;

[0025] Figure 3 Metallographic structure diagram of magnesium-based composite castings made using the magnesium-based composite material equipment provided by this utility model;

[0026] Figure 4 Scanning electron microscope (SEM) image of the tensile fracture surface of a magnesium-based composite material casting made using the magnesium-based composite material equipment provided by this invention;

[0027] Figure 5 The tensile fracture energy spectrum of a magnesium-based composite casting made using the magnesium-based composite material equipment provided by this utility model.

[0028] Explanation of icon numbers:

[0029] 100. Die-casting mold; 110. Molding cavity;

[0030] 1. Material pipe; 11. Material storage bin;

[0031] 2. Feeding position; 21. First feeding position; 22. Second feeding position; 23. Third feeding position;

[0032] 3. Main feeding mechanism; 31. Main hopper;

[0033] 4. Auxiliary feeding mechanism; 41. Auxiliary hopper;

[0034] 5. Heating components;

[0035] 6. Main push assembly; 61. Main screw; 62. Main drive unit; 63. Injection drive unit;

[0036] 7. Secondary push assembly; 71. Secondary screw; 72. Secondary drive unit;

[0037] 8. Guide rail.

[0038] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0040] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] Magnesium-based composite materials are novel materials made by adding reinforcing phases (such as ceramic particles and carbon fibers) to magnesium or magnesium alloys as the matrix. They possess excellent properties such as lightweight, high specific strength, and high specific stiffness, and are widely used in aerospace, automotive, and electronics industries. In aerospace, they effectively reduce aircraft weight and improve fuel efficiency, making them suitable for fuselage structures and engine components. In the automotive industry, they help reduce energy consumption and emissions, aligning with green manufacturing trends, and are commonly used in engine blocks and wheel hubs. In electronics, their excellent thermal conductivity and electromagnetic shielding properties make them ideal for electronic device housings and heat dissipation materials.

[0043] Carbon fiber reinforced magnesium matrix composites are high-performance magnesium matrix composites prepared by adding carbon fibers to magnesium or magnesium alloys as the matrix. These composites have a low density (1.74 g / cm³). 3With its excellent mechanical properties and good thermoelectric properties, magnesium has broad application potential in aerospace, automotive lightweighting, and heat dissipation of electronic devices. The addition of carbon fiber significantly improves the tensile strength, elastic modulus, and wear resistance of the magnesium matrix, while maintaining the good damping properties of magnesium alloys, making it suitable for components subjected to dynamic loads.

[0044] However, this composite material still faces many challenges in industrial applications. First, the interfacial bonding between the magnesium matrix and carbon fibers is weak, easily leading to interfacial debonding and affecting performance. Although this can be improved through surface coatings or interfacial modification, the degree of interfacial reaction is still difficult to control, and excessive reaction can easily produce harmful interfaces. Second, uniform dispersion of carbon fibers in the magnesium matrix is ​​difficult, and oxidation or interfacial reactions easily occur during high-temperature preparation, leading to performance degradation. Finally, existing magnesium-based composite material preparation processes (such as powder metallurgy and stir casting) are inefficient and costly, masking the price advantage of magnesium alloys and posing certain safety risks, hindering large-scale promotion. In conclusion, although carbon fiber reinforced magnesium matrix composites have significant performance advantages, further breakthroughs are needed in interfacial bonding and preparation processes to achieve wider industrial applications.

[0045] To address the aforementioned issues, this invention provides a magnesium-based composite material molding device. By altering the timing and temperature of carbon fiber addition, the degree of interfacial reaction between the carbon fiber and the magnesium alloy matrix can be controlled, effectively preventing the formation of harmful interfaces and achieving an ideal interfacial bonding effect. Furthermore, the manufacturing process based on this device can be simplified, enabling rapid, mass production of magnesium-based composite material components at a lower cost. This solves the problems of low efficiency, high cost, and safety risks associated with existing powder metallurgy and stir casting processes, thus providing conditions for large-scale industrial applications.

[0046] Please see Figure 1 The magnesium-based composite material molding equipment provided by this utility model includes:

[0047] Material pipe 1, the front end of material pipe 1 is connected to the forming cavity 110 of die casting mold 100, and at least two feeding positions 2 are provided at intervals along the length of material pipe 1;

[0048] The main feeding mechanism 3 is used to feed magnesium alloy substrate into the rear end of the feed pipe 1;

[0049] The auxiliary feeding mechanism 4 is movable along the length of the material tube 1. The auxiliary feeding mechanism 4 is used to feed carbon fiber powder into the inner cavity of the material tube 1 at any feeding position 2.

[0050] Heating component 5 is used to heat the inner cavity of the feed tube 1;

[0051] The main pushing component 6 is installed inside the feed pipe 1. The main pushing component 6 is used to push the magnesium alloy matrix supplied by the main feeding mechanism 3 forward, so that the magnesium alloy matrix melts under the heating action of the heating component 5 to form a semi-solid slurry, and mixes with the carbon fiber powder supplied by the auxiliary feeding mechanism 4 to form a semi-solid composite slurry. The main pushing component 6 is also used to further push the mixed semi-solid composite slurry forward into the forming cavity 110 for die casting.

[0052] In this embodiment, the die-casting mold 100 is designed according to the shape and size of the magnesium-based composite material part to be prepared. During operation, the semi-solid composite slurry enters the forming cavity 110 of the die-casting mold 100 under the pushing action of the main pushing component 6. With the help of the shape constraint and cooling and shaping effect of the die-casting mold 100, it can be formed into a magnesium-based composite material casting with a certain shape and performance.

[0053] At least two feeding positions 2 are spaced apart along the length of the feed pipe 1, each feeding position 2 communicating with the inner cavity of the feed pipe 1. These feeding positions 2 provide the auxiliary feeding mechanism 4 with the means to add carbon fiber powder at different locations. By rationally selecting the number and spacing of the feeding positions 2, the timing of adding carbon fiber powder can be precisely controlled according to the flow state, heating degree, and mixing requirements of the magnesium alloy matrix within the feed pipe 1. For example, as... Figure 1 As shown, three feeding positions 2 are spaced apart along the length of the feed tube 1. The spacing between adjacent feeding positions 2 can be determined based on factors such as the average residence time of the magnesium alloy matrix in the feed tube 1 and the heating rate, so as to ensure that the carbon fiber powder can be added at a suitable position, so that the added carbon fiber powder can be mixed with the magnesium alloy matrix under ideal conditions, thereby effectively controlling the interfacial reaction between the magnesium alloy matrix and the carbon fiber powder.

[0054] The main feeding mechanism 3 can rely on gravity or the driving action of an auxiliary feeding device (such as a vibrator) to ensure that the fed magnesium alloy matrix enters the inner cavity of the feed tube 1 uniformly and stably from the rear end. The feeding speed and other parameters of the main feeding mechanism 3 can be adjusted according to the needs of subsequent processes. For example, by controlling the opening of the feeding channel or adjusting the power of the auxiliary feeding device, the pushing speed of the main pushing component 6 and the heating efficiency of the heating component 5 can be better matched to ensure that the magnesium alloy matrix enters the feed tube 1 at a preset speed and begins the heating and melting process. The magnesium alloy matrix can be in granular form, such as AZ91D magnesium alloy granules or AM60B magnesium alloy granules.

[0055] The auxiliary feeding mechanism 4 can move along the length of the feed pipe 1 by manual movement or under the drive of a motor, cylinder, or other driving device, with the aid of a corresponding guiding structure. This mobility allows the auxiliary feeding mechanism 4 to flexibly switch between different feeding positions 2. In practical applications, the auxiliary feeding mechanism 4 may include a storage section and a feeding device. The storage section is used to store a certain amount of carbon fiber powder, and the feeding device is used to feed the carbon fiber powder stored in the storage section into the inner cavity of the feed pipe 1 according to a preset amount and speed. Specifically, the carbon fiber powder may be short carbon fibers.

[0056] Heating component 5 can employ electric heating, induction heating, hot air heating, or other methods. Electric heating offers advantages such as rapid heating, high temperature control accuracy, and ease of operation. Taking electric heating component 5 as an example, multiple electric heating rods can be spaced along the length of the material tube 1. Each heating rod can be controlled by an independent temperature control module, enabling precise temperature adjustment in different areas within the material tube 1. Furthermore, to improve heating efficiency and uniformity, a heat insulation layer can be installed on the sidewall of the material tube 1 to reduce heat loss to the outside. Simultaneously, temperature sensors such as thermocouples are installed outside the material tube 1 to monitor temperature changes within the tube's interior in real time and feed the temperature signal back to the temperature control system. This allows for automatic adjustment of heating parameters, ensuring temperature stability and uniformity within the material tube 1 and providing a suitable thermal environment for melting the magnesium alloy matrix and mixing it with carbon fiber powder.

[0057] The main pushing component 6 is located inside the feed pipe 1 and has two main functions: first, to push the magnesium alloy substrate supplied by the main feeding mechanism 3 forward, so that it forms a semi-solid slurry under the heating action of the heating component 5; second, to further push the semi-solid composite slurry formed by mixing the semi-solid slurry with carbon fiber powder into the forming cavity 110 of the die-casting mold 100 for die casting. The main pushing component 6 can adopt various structural forms, such as a spiral pushing structure or a piston telescopic pushing structure, which is not limited here. Taking the spiral pushing structure as an example, during the process of pushing the magnesium alloy matrix through the rotation of the screw, the magnesium alloy matrix is ​​continuously heated by the heating component 5 and gradually melts to form a semi-solid slurry. When carbon fiber powder is added from the auxiliary feeding mechanism 4, the rotating stirring action of the screw can fully mix the carbon fiber powder with the semi-solid slurry to form a uniform semi-solid composite slurry. Subsequently, the screw continues to push the semi-solid composite slurry forward into the forming cavity 110 of the die-casting mold 100, so as to form a magnesium-based composite material casting under the high pressure of the die-casting mold 100. The pushing speed of the main pushing component 6 should be adjusted according to factors such as the melting characteristics of the magnesium alloy matrix, the amount and timing of the addition of carbon fiber powder, and the filling requirements of the forming cavity 110.

[0058] like Figures 3 to 5As shown, based on the above equipment and preparation process, the carbon fiber reinforced magnesium matrix composite castings obtained are in the form of a block structure with good density. The carbon fibers are evenly distributed in space, and there is a slight interfacial reaction between the carbon fibers and the magnesium alloy matrix, which can form a good interfacial bond.

[0059] Therefore, the magnesium-based composite material molding equipment and its corresponding preparation technology provided in this embodiment are significantly more advanced than existing magnesium-based composite material preparation technologies. Firstly, this solution enables continuous, stable, and efficient preparation of magnesium-based composite materials, offering higher efficiency, simpler processes, lower costs, and higher safety compared to the intermittent, furnace-based production mode of powder metallurgy, allowing for rapid mass production. Secondly, the composite material prepared by this solution exhibits good carbon fiber dispersion without any agglomeration, effectively improving the mechanical properties of the composite material. Finally, by adjusting the position of the secondary feeding mechanism 4, the addition time of the carbon fibers can be easily controlled, thereby flexibly controlling the contact timing and reaction time between the carbon fibers and the magnesium alloy matrix, ultimately controlling the degree of interfacial reaction (thickness of the reaction interface), effectively avoiding the formation of harmful interfaces, and thus obtaining an ideal interfacial bonding effect.

[0060] In one embodiment, refer to Figure 1 The main pushing component 6 includes a main screw 61 and a main drive device 62. The main screw 61 is disposed in the inner cavity of the feed tube 1, and the main drive device 62 is connected to the main screw 61. The main drive device 62 is used to drive the main screw 61 to rotate, so as to push the magnesium alloy substrate supplied by the main feeding mechanism 3 forward.

[0061] Specifically, the main drive device 62 may include a rotary motor and a matching transmission mechanism, reduction mechanism, etc. The main drive device 62 may be located outside the feed tube 1 and connected to the rear end of the main screw 61. The maximum outer diameter of the main screw 61 should maintain a small distance from the inner wall of the feed tube 1, so as to ensure that the main screw 61 can rotate normally relative to the feed tube 1, while avoiding excessive accumulation of semi-solid slurry due to excessive gap between the main screw 61 and the feed tube 1, which would make it difficult for the semi-solid slurry to be pushed forward smoothly under the rotation of the main screw 61.

[0062] Based on the above setup, the magnesium alloy matrix supplied by the main feeding mechanism 3 will fill the screw groove of the main screw 61. When the main drive device 62 drives the main screw 61 to rotate, the magnesium alloy matrix in the screw groove will be continuously pushed forward with the rotation of the main screw 61, and gradually melted into a semi-solid slurry under the heating action of the heating component 5. This method of pushing through the main screw 61 can provide a stable pushing force, and the pushing process is accompanied by a stirring action, which is beneficial to the uniform heating and melting of the magnesium alloy matrix.

[0063] When carbon fiber powder is fed into the feed pipe 1 by the auxiliary feeding mechanism 4, the rotating main screw 61 can shear and stir the semi-solid slurry and carbon fiber powder, so that the two are fully mixed to form a semi-solid composite slurry; the partially agglomerated carbon fiber powder is dispersed under the action of shear force, and the viscous slurry makes it difficult for the carbon fiber powder to move inside the slurry, thereby ensuring the uniformity of carbon fiber powder dispersion in the semi-solid composite slurry.

[0064] In one embodiment, refer to Figure 1 The magnesium-based composite material molding equipment also includes a secondary pushing component 7; the secondary pushing component 7 is used to push the carbon fiber powder supplied by the secondary feeding mechanism 4 into the inner cavity of the feed pipe 1 so that the carbon fiber powder mixes with the semi-solid slurry in the feed pipe 1 to form a semi-solid composite slurry.

[0065] Specifically, the secondary pushing component 7 can adopt various structural forms, such as a spiral pushing structure or a piston telescopic pushing structure, which is not limited here. By setting the secondary pushing component 7, it can be ensured that the carbon fiber powder can be mixed into the semi-solid slurry under a certain driving force, and fully mixed under the stirring and pushing action of the main pushing component 6. Furthermore, the secondary pushing component 7 can precisely control the feeding amount and feeding speed of the carbon fiber powder, thereby further improving the uniformity of the mixing between the two, which is beneficial to obtaining high-performance magnesium-based composite material castings.

[0066] In one embodiment, refer to Figure 1 The auxiliary push assembly 7 includes an auxiliary screw 71 and an auxiliary drive device 72. The auxiliary screw 71 is disposed in the auxiliary feeding mechanism 4, and the auxiliary drive device 72 is connected to the auxiliary screw 71. The auxiliary drive device 72 is used to drive the auxiliary screw 71 to rotate so as to drive the carbon fiber powder supplied by the auxiliary feeding mechanism 4 into the inner cavity of the feed pipe 1.

[0067] Specifically, the auxiliary drive device 72 may include a rotary motor and a matching transmission mechanism, reduction mechanism, etc. The auxiliary drive device 72 may be located outside the auxiliary feeding mechanism 4 and connected to the end of the auxiliary screw 71. In actual operation, the carbon fiber powder supplied by the auxiliary feeding mechanism 4 will fill the screw groove of the auxiliary screw 71. When the auxiliary drive device 72 drives the auxiliary screw 71 to rotate, the carbon fiber powder in the screw groove will be continuously pushed towards the feed tube 1 as the auxiliary screw 71 rotates. This method of pushing through the auxiliary screw 71 can provide a stable pushing force, and the rotating auxiliary screw 71 and the rotating main screw 61 can form a relative shearing and stirring action, which is beneficial to fully mix the semi-solid slurry and carbon fiber powder. Compared with existing preparation processes such as stirring casting, this greatly improves the upper limit of the reinforcing phase (carbon fiber) content.

[0068] In one embodiment, refer to Figure 1The front end of the material tube 1 is provided with a storage bin 11; the main push assembly 6 also includes an injection drive device 63, which is connected to the main screw 61; when the semi-solid composite slurry formed by mixing enters the storage bin 11 under the drive of the rotating main screw 61, the injection drive device 63 is used to drive the main screw 61 to move forward so as to squeeze the semi-solid composite slurry in the storage bin 11 into the molding cavity 110.

[0069] Specifically, the storage bin 11 is located between the front end of the main screw 61 and the molding cavity 110. The semi-solid composite slurry formed by mixing can be continuously fed into the storage bin 11 under the drive of the rotating main screw 61. When the storage bin 11 is full of semi-solid composite slurry, it is difficult to push the semi-solid composite slurry further into the molding cavity 110 by the simple rotation of the main screw 61 alone. At this time, it is necessary to change the movement mode of the main screw 61 and drive the main screw 61 forward by the injection drive device 63. In this way, the resistance can be overcome and the semi-solid composite slurry in the storage bin 11 can be squeezed into the molding cavity 110 quickly and directly.

[0070] This embodiment, by setting up a storage bin 11 and an injection drive device 63, enables the accumulation and rapid injection of semi-solid composite slurry. When the injection drive device 63 drives the main screw 61 to squeeze a portion of the semi-solid composite slurry in the storage bin 11 into the molding cavity 110, during the die casting process, the injection drive device 63 can drive the main screw 61 to retract, and the main drive device 62 can continue to drive the main screw 61 to rotate, continuously replenishing the semi-solid composite slurry formed at the rear end into the storage bin 11, ensuring that the storage bin 11 is full before the completion of this round of die casting. Thus, when this round of die casting is completed and the magnesium-based composite material casting is removed, the injection drive device 63 only needs to drive the main screw 61 forward again to squeeze the semi-solid composite slurry in the storage bin 11 into the molding cavity 110, and the next round of die casting can be performed. This cycle can be repeated to improve molding efficiency.

[0071] The injection drive device 63 can be a hydraulic cylinder, servo motor, or other device capable of providing linear motion driving force. In one embodiment, the fixing part of the injection drive device 63 can be disposed on the driving part of the main drive device 62, and the main screw 61 can be disposed on the driving part of the injection drive device 63. The main drive device 62 can drive the injection drive device 63 and the main screw 61 to rotate, and the injection drive device 63 can drive the main screw 61 to move back and forth. In another embodiment, the fixing part of the main drive device 62 can be disposed on the driving part of the injection drive device 63, and the main screw 61 can be disposed on the driving part of the main drive device 62. The main drive device 62 can drive the main screw 61 to rotate, and the injection drive device 63 can drive the main drive device 62 and the main screw 61 to move back and forth. The specific connection form between the injection drive device 63, the main drive device 62, and the main screw 61 is not limited here.

[0072] In one embodiment, refer to Figure 1 The main feeding mechanism 3 is set as the main hopper 31, which has a funnel-shaped structure.

[0073] By setting the main feeding mechanism 3 as a funnel-shaped main hopper 31, it is convenient to inject a large amount of magnesium alloy matrix into it, and it is also beneficial for the magnesium alloy matrix to collect and slide smoothly inside, ensuring that the magnesium alloy matrix can smoothly enter the inner cavity of the feed pipe 1. The opening size of the main hopper 31 should be determined according to the particle size distribution and production scale of the magnesium alloy matrix in actual production, so as to ensure sufficient feed while avoiding blockage of the magnesium alloy matrix in the main hopper 31.

[0074] In one embodiment, refer to Figure 1 The auxiliary feeding mechanism 4 is configured as an auxiliary hopper 41, which has a funnel-shaped structure.

[0075] By setting the secondary feeding mechanism 4 as a funnel-shaped secondary hopper 41, it is convenient to inject a large amount of carbon fiber powder into it, and it is also beneficial for the carbon fiber powder to collect and slide smoothly inside, ensuring that the carbon fiber powder can smoothly enter the inner cavity of the feed pipe 1. The opening size of the secondary hopper 41 should be determined according to the size parameters of the carbon fiber powder and the production scale in actual production, so as to ensure sufficient supply while avoiding blockage of carbon fiber powder in the secondary hopper 41.

[0076] In one embodiment, refer to Figure 1 The heating component 5 includes multiple heating units, which are arranged at intervals along the length of the material tube 1.

[0077] Specifically, taking electric heating as an example, each heating unit can correspond to a set of electric heating rods. Each heating unit can be controlled by an independent temperature control module, so that the heating power of the corresponding heating unit can be adjusted according to the heating requirements of different positions in the material tube 1. For example, in the area near the rear end of the material tube 1, since the magnesium alloy substrate has just entered, a heating unit with relatively low heating power can be set; as the material tube 1 extends towards the front end, the power of the heating unit can be gradually increased, so that the magnesium alloy substrate gradually reaches a molten state during the forward pushing process, forming a uniform semi-solid slurry.

[0078] By using multiple heating units to precisely control the temperature at different locations along the length of the feed tube 1, a reasonable distribution of the temperature field inside the feed tube 1 can be achieved, improving heating efficiency and heating uniformity. Furthermore, it can accurately control the mixing of the semi-solid slurry with the carbon fiber powder when it reaches the ideal molten state, which is beneficial for obtaining an ideal interfacial bonding effect between the magnesium alloy matrix and the carbon fiber powder.

[0079] In one embodiment, refer to Figure 1 The magnesium-based composite material molding equipment also includes a guide rail 8, which passes through each feeding position 2 in sequence; the auxiliary feeding mechanism 4 is slidably fitted on the guide rail 8 to move to any feeding position 2.

[0080] By setting the guide rail 8, the requirements for smooth sliding and accurate positioning of the auxiliary feeding mechanism 4 can be met. A scale or position sensor can be installed on the guide rail 8 to indicate and precisely control the movement position of the auxiliary feeding mechanism 4 on the guide rail 8, ensuring that the auxiliary feeding mechanism 4 can accurately move to the required feeding position 2 and perform the carbon fiber powder feeding operation.

[0081] In one embodiment, refer to Figure 1 The auxiliary feeding mechanism 4 is used to feed nickel-plated carbon fiber into the inner cavity of the feed tube 1 at any feeding position 2.

[0082] Nickel-plated carbon fiber involves plating a layer of nickel metal onto the surface of carbon fibers to improve the interfacial bonding between the carbon fibers and the magnesium alloy matrix. Nickel metal possesses good chemical stability and compatibility with magnesium alloys, enabling the formation of a relatively stable interfacial phase between the carbon fibers and the magnesium alloy matrix, reducing interfacial debonding. Furthermore, by adding a nickel transition layer between the carbon fibers and the magnesium alloy matrix, the nickel can react with the aluminum in the magnesium alloy matrix to form a reaction interface with even stronger bonding, thereby further improving the mechanical properties of the final magnesium-based composite casting.

[0083] Based on the magnesium-based composite material molding equipment provided in the above embodiments of this utility model, for a detailed explanation of its specific molding process, please refer to [link / reference needed]. Figure 1 and Figure 2A method for molding magnesium-based composite materials is proposed, which includes the following steps:

[0084] Turn on heating component 5 to preheat material pipe 1;

[0085] Magnesium alloy substrate is fed into the rear end of feed pipe 1 through main feed mechanism 3;

[0086] The magnesium alloy substrate in the feed pipe 1 is pushed forward by the main push component 6, so that the magnesium alloy substrate melts under the heating action of the heating component 5 to form a semi-solid slurry.

[0087] Carbon fiber powder is fed into the inner cavity of the feed pipe 1 through one of the feeding positions 2 by the auxiliary feeding mechanism 4, so that the carbon fiber powder is mixed with the semi-solid slurry in the feed pipe 1 to form a semi-solid composite slurry.

[0088] The die-casting mold 100 is preheated, and a release agent is sprayed on the surface of the die-casting mold 100. Then the die-casting mold 100 is closed.

[0089] The semi-solid composite slurry in the material pipe 1 is pushed into the forming cavity 110 of the die casting mold 100 by the main push component 6, and pressure holding operation is performed so that the semi-solid composite slurry solidifies into a magnesium-based composite material casting in the forming cavity 110.

[0090] Open the die-casting mold 100 and remove the magnesium-based composite material casting.

[0091] In this scheme, the heating component 5 is first activated to preheat the feed tube 1. The heating temperature, preheating time, and other parameters of the heating component 5 need to be set according to the characteristics of the magnesium alloy matrix and the subsequent process requirements to ensure that the inner cavity of the feed tube 1 reaches a suitable initial temperature before the magnesium alloy matrix enters, which is beneficial to the subsequent melting of the magnesium alloy matrix. Then, the magnesium alloy matrix is ​​fed into the rear end of the feed tube 1 through the main feeding mechanism 3. The feeding speed and method of the main feeding mechanism 3 should ensure that the magnesium alloy matrix can enter the feed tube 1 stably and uniformly. Gravity feeding or vibration feeding can be used. Subsequently, the main pushing component 6 is used to push the magnesium alloy matrix forward and melt it to form a semi-solid slurry. The pushing speed and pushing method of the main pushing component 6 need to be matched with the heating rate of the heating component 5 to achieve uniform melting of the magnesium alloy matrix. Uniform melting; when feeding carbon fiber powder through the auxiliary feeding mechanism 4, a suitable feeding position 2 needs to be selected to ensure that the carbon fiber powder is fully mixed with the semi-solid slurry in the ideal molten state to form a uniform semi-solid composite slurry; parameters such as the preheating temperature of the die-casting mold 100, the type of release agent, and the spraying thickness have an important impact on the quality of the casting and the demolding effect. For example, if the release agent is sprayed too thickly, it may cause too much residue on the surface of the casting and affect the surface quality, while if it is too thin, it may cause demolding difficulties; the holding pressure and holding time of the holding pressure operation need to be adjusted according to the size of the forming cavity 110 and the characteristics of the magnesium-based composite material to ensure the density and dimensional accuracy of the casting; finally, when opening the mold and taking out the magnesium-based composite casting, the opening speed and method need to be controlled to avoid damage to the magnesium-based composite casting.

[0092] Since this magnesium-based composite material molding method adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments. That is, it can realize the continuous, stable and efficient preparation of magnesium-based composite materials. Compared with the intermittent production mode of powder metallurgy, it is more efficient, simpler in process, lower in cost and safer, and can realize rapid mass production. Secondly, the carbon fiber in the composite material prepared by this method has good dispersion and no agglomeration, which effectively improves the mechanical properties of the composite material. Finally, by adjusting the position of the auxiliary feeding mechanism 4, the addition time of carbon fiber can be conveniently controlled, thereby flexibly controlling the contact timing and reaction time between carbon fiber and magnesium alloy matrix, and finally controlling the degree of interface reaction (thickness of the reaction interface), effectively avoiding the generation of harmful interfaces, and thus obtaining an ideal interface bonding effect.

[0093] Furthermore, referring to Figure 1 and Figure 2 The main push component 6 includes a main screw 61 and a main drive device 62. The main screw 61 is disposed in the inner cavity of the material tube 1, and the main drive device 62 is connected to the main screw 61.

[0094] The step of pushing the magnesium alloy substrate in the feed pipe 1 forward through the main push component 6 includes:

[0095] The main screw 61 is driven to rotate by the main drive device 62, so as to push the magnesium alloy substrate in the feed pipe 1 forward by the main screw 61; the rotation speed of the main screw 61 is 150~200 r / min.

[0096] Specifically, the main drive device 62 may include a rotary motor and a matching transmission mechanism, reduction mechanism, etc. The main drive device 62 may be located outside the feed tube 1 and connected to the rear end of the main screw 61. The maximum outer diameter of the main screw 61 should maintain a small distance from the inner wall of the feed tube 1, so as to ensure that the main screw 61 can rotate normally relative to the feed tube 1, while avoiding excessive accumulation of semi-solid slurry due to excessive gap between the main screw 61 and the feed tube 1, which would make it difficult for the semi-solid slurry to be pushed forward smoothly under the rotation of the main screw 61.

[0097] Based on the above setup, the magnesium alloy matrix supplied by the main feeding mechanism 3 will fill the screw groove of the main screw 61. When the main drive device 62 drives the main screw 61 to rotate, the magnesium alloy matrix in the screw groove will be continuously pushed forward with the rotation of the main screw 61, and gradually melted into a semi-solid slurry under the heating action of the heating component 5. This method of pushing through the main screw 61 can provide a stable pushing force, and the pushing process is accompanied by a stirring action, which is beneficial to the uniform heating and melting of the magnesium alloy matrix.

[0098] When carbon fiber powder is fed into the feed pipe 1 by the auxiliary feeding mechanism 4, the rotating main screw 61 can shear and stir the semi-solid slurry and carbon fiber powder, so that the two are fully mixed to form a semi-solid composite slurry; the partially agglomerated carbon fiber powder is dispersed under the action of shear force, and the viscous slurry makes it difficult for the carbon fiber powder to move inside the slurry, thereby ensuring the uniformity of carbon fiber powder dispersion in the semi-solid composite slurry.

[0099] The rotational speed of the main screw 61 is set within the range of 150 to 200 r / min. This rotational speed range can ensure the stable conveying of the magnesium alloy matrix in the feed tube 1, and also allow it to fully melt under the action of the heating component 5 to form a uniform semi-solid slurry. If the rotational speed of the main screw 61 is too low, the conveying efficiency of the magnesium alloy matrix may be low. If the rotational speed is too high, the magnesium alloy matrix of the guide column may stay in the feed tube 1 for too short a time, resulting in incomplete melting, which will affect the subsequent mixing and molding quality.

[0100] Furthermore, referring to Figure 1 and Figure 2 The front end of the material tube 1 is provided with a storage bin 11; the main push assembly 6 also includes an injection drive device 63, which is connected to the main screw 61.

[0101] The steps of pushing the semi-solid composite slurry in the feed pipe 1 into the forming cavity 110 of the die-casting mold 100 through the main push component 6 and performing a pressure holding operation include:

[0102] When the semi-solid composite slurry is filled into the storage bin 11 by the rotating main screw 61, the main screw 61 is driven forward by the injection drive device 63 to squeeze the semi-solid composite slurry in the storage bin 11 into the molding cavity 110. The moving speed of the main screw 61 pushing the semi-solid composite slurry forward is 2 to 2.5 m / s, and the holding pressure of the holding operation is 100 to 200 MPa.

[0103] Specifically, the storage bin 11 is located between the front end of the main screw 61 and the molding cavity 110. The semi-solid composite slurry formed by mixing can be continuously fed into the storage bin 11 under the drive of the rotating main screw 61. When the storage bin 11 is full of semi-solid composite slurry, it is difficult to push the semi-solid composite slurry further into the molding cavity 110 by the simple rotation of the main screw 61 alone. At this time, it is necessary to change the movement mode of the main screw 61 and drive the main screw 61 forward by the injection drive device 63. In this way, the resistance can be overcome and the semi-solid composite slurry in the storage bin 11 can be squeezed into the molding cavity 110 quickly and directly.

[0104] This solution, by setting up a storage silo 11 and an injection drive device 63, enables the accumulation and rapid injection of semi-solid composite slurry. When the injection drive device 63 drives the main screw 61 to squeeze a portion of the semi-solid composite slurry from the storage silo 11 into the molding cavity 110, during the die casting process, the injection drive device 63 can drive the main screw 61 to retract, and the main drive device 62 can continue to drive the main screw 61 to rotate, continuously replenishing the semi-solid composite slurry formed at the rear end into the storage silo 11, ensuring that the storage silo 11 is full before the completion of this round of die casting. Thus, after this round of die casting is completed, the magnesium-based composite material casting is removed. At this time, the injection drive device 63 only needs to drive the main screw 61 forward again to squeeze the semi-solid composite slurry in the storage silo 11 into the molding cavity 110, and the next round of die casting can be performed. This cycle can be repeated to improve molding efficiency.

[0105] The injection drive device 63 can be a hydraulic cylinder, servo motor, or other device capable of providing linear motion driving force. In one embodiment, the fixing part of the injection drive device 63 can be disposed on the driving part of the main drive device 62, and the main screw 61 can be disposed on the driving part of the injection drive device 63. The main drive device 62 can drive the injection drive device 63 and the main screw 61 to rotate, and the injection drive device 63 can drive the main screw 61 to move back and forth. In another embodiment, the fixing part of the main drive device 62 can be disposed on the driving part of the injection drive device 63, and the main screw 61 can be disposed on the driving part of the main drive device 62. The main drive device 62 can drive the main screw 61 to rotate, and the injection drive device 63 can drive the main drive device 62 and the main screw 61 to move back and forth. The specific connection form between the injection drive device 63, the main drive device 62, and the main screw 61 is not limited here.

[0106] This design sets the forward pushing speed of the main screw 61 for the slurry to 2–2.5 m / s. This speed ensures that the semi-solid composite slurry fills the molding cavity 110 quickly and evenly, avoiding a decrease in temperature and reduced fluidity of the semi-solid composite slurry during its entry into the molding cavity 110 due to excessively slow filling speed, which would affect the casting quality. The holding pressure for the pressure holding operation is set to 100–200 MPa. This pressure range allows the slurry to be fully compacted within the molding cavity 110, eliminating internal air bubbles, improving the density and strength of the casting, and ensuring the dimensional accuracy and surface quality of the casting.

[0107] Furthermore, referring to Figure 1 and Figure 2 The magnesium-based composite material molding equipment also includes a secondary pushing component 7, which includes a secondary screw 71 and a secondary driving device 72. The secondary screw 71 is disposed in the secondary feeding mechanism 4, and the secondary driving device 72 is connected to the secondary screw 71.

[0108] The step of feeding carbon fiber powder into the inner cavity of the feed pipe 1 through the auxiliary feeding mechanism 4 at one of the feeding positions 2 includes:

[0109] The auxiliary screw 71 is driven to rotate by the auxiliary drive device 72, so that the carbon fiber powder supplied by the auxiliary feeding mechanism 4 is driven into the inner cavity of the feed pipe 1 by the auxiliary screw 71; the rotation speed of the auxiliary screw 71 is 60 to 120 r / min.

[0110] Specifically, the auxiliary drive device 72 may include a rotary motor and a matching transmission mechanism, reduction mechanism, etc. The auxiliary drive device 72 may be located outside the auxiliary feeding mechanism 4 and connected to the end of the auxiliary screw 71. In actual operation, the carbon fiber powder supplied by the auxiliary feeding mechanism 4 will fill the screw groove of the auxiliary screw 71. When the auxiliary drive device 72 drives the auxiliary screw 71 to rotate, the carbon fiber powder in the screw groove will be continuously pushed towards the feed tube 1 as the auxiliary screw 71 rotates. This method of pushing through the auxiliary screw 71 can provide a stable pushing force, and the rotating auxiliary screw 71 and the rotating main screw 61 can form a relative shearing and stirring action, which is beneficial to fully mix the semi-solid slurry and carbon fiber powder. Compared with existing preparation processes such as stirring casting, this greatly improves the upper limit of the reinforcing phase (carbon fiber) content.

[0111] The rotational speed of the auxiliary screw 71 is controlled between 60 and 120 r / min. This rotational speed range can ensure a stable supply of carbon fiber powder, allowing it to be uniformly added to the semi-solid slurry. This enables precise control of the ratio of carbon fiber powder to magnesium alloy matrix and the dispersion effect of carbon fiber powder in the semi-solid slurry, thereby ensuring the interfacial bonding effect between carbon fiber and magnesium alloy matrix.

[0112] Furthermore, referring to Figure 1 and Figure 2 The heating assembly 5 includes multiple heating units, which are arranged at intervals along the length of the material tube 1; the heating temperature of the heating units is 400-650℃, and the heating temperature of the multiple heating units increases sequentially from the rear end to the front end of the material tube 1; the preheating time of the material tube 1 is 60-120 minutes.

[0113] Furthermore, referring to Figure 1 and Figure 2 The preheating temperature for preheating the die-casting mold 100 is 180-220℃, the release agent is magnesium oxide, and the thickness of the release agent sprayed on the surface of the die-casting mold 100 is 0.1-0.15mm.

[0114] Furthermore, referring to Figure 1 and Figure 2 The carbon fiber powder uses nickel-plated carbon fibers with a length of 50–300 μm and a diameter of 4.5–5.5 μm.

[0115] Specifically, taking electric heating as an example, each heating unit corresponds to a set of electric heating rods. Each heating unit can be controlled by an independent temperature control module, thus adjusting the heating power of the corresponding heating unit according to the heating requirements of different locations within the material tube 1. The temperature of the heating unit is set to 400–650°C, with the temperature increasing sequentially from the rear end to the front end of the material tube 1. This temperature gradient is beneficial for the gradual melting and flow of the magnesium alloy matrix within the material tube 1. The preheating time of the heating unit for the material tube 1 is 60–120 minutes, which ensures uniform temperature within the material tube 1 and provides a stable thermal environment for subsequent operations.

[0116] The preheating temperature of the die-casting mold 100 is set between 180 and 220°C. This temperature range ensures that the semi-solid composite slurry can smoothly fill the molding cavity 110, while avoiding adverse effects on material properties caused by excessively high or low mold temperatures. Magnesium oxide is used as the release agent, and its coating thickness on the surface of the die-casting mold 100 is 0.1–0.15 mm. Magnesium oxide release agent has good release effect and lubricity, and will not contaminate the casting surface. Reasonable control of the coating thickness can effectively prevent release agent residue from affecting the casting quality.

[0117] The selection of nickel-plated carbon fibers with a length of 50–300 μm and a diameter of 4.5–5.5 μm aims to improve the interfacial bonding performance between the carbon fibers and the magnesium alloy matrix. Nickel metal possesses good chemical stability and compatibility with magnesium alloys, enabling the formation of a relatively stable interfacial phase between the carbon fibers and the magnesium alloy matrix, reducing interfacial debonding. Furthermore, by adding a nickel transition layer between the carbon fibers and the magnesium alloy matrix, the nickel can react with the aluminum in the magnesium alloy matrix to form a reaction interface with higher bonding strength, thereby further improving the mechanical properties of the final magnesium-based composite casting.

[0118] Based on the specific parameters and conditions set above, the molding method of magnesium-based composite materials is made more precise and controllable, further optimizing the preparation process of magnesium-based composite material castings, improving the performance and quality of castings, reducing production costs, and providing reliable process assurance for the large-scale industrial application of magnesium-based composite materials.

[0119] Based on the above-described magnesium-based composite material molding method, two specific embodiments are provided below for illustrative purposes:

[0120] Example 1

[0121] Reference Figure 1There are three feeding positions 2. The three feeding positions 2 are called the first feeding position 21, the second feeding position 22 and the third feeding position 23 respectively from the rear end to the front end of the material pipe 1. Once the preparation process begins, the heating assembly 5 is first activated, dividing the feed pipe 1 into five temperature zones from the rear to the front. These five temperature zones are set to 480℃, 580℃, 590℃, 595℃, and 595℃ respectively, with a preheating time of 60 minutes. Then, AZ91D magnesium alloy particles are added to the main hopper 31, and nickel-plated carbon fiber powder (50-300μm in length and 5μm in diameter) is added to the auxiliary hopper 41. Subsequently, the main screw 61 is driven to rotate via the main drive device 62 at a speed of 180 r / min. The AZ91D magnesium alloy particles gradually move towards the forming cavity 110 of the die-casting mold 100 under the pushing action of the main screw 61. Simultaneously, the AZ91D magnesium alloy particles are gradually heated to a semi-solid state, forming a semi-solid slurry, which mainly consists of a large liquid phase and a small amount of spherical α-Mg solid phase. After the magnesium alloy raw material fills the feed pipe 1, the auxiliary hopper 41 is moved to the second material level 22, and then driven by the auxiliary drive device 62... The actuator 72 drives the auxiliary screw 71 to rotate, and the rotation speed of the auxiliary screw 71 is set to 80 r / min. The carbon fiber powder added to the auxiliary hopper 41 is mixed into the semi-solid slurry in the feed pipe 1 under the strong push of the auxiliary screw 71. The rotating main screw 61 shears and stirs the semi-solid slurry and carbon fiber powder to make them fully mixed. Some of the agglomerated carbon fiber powder is dispersed under the action of shear force. The viscous slurry makes it difficult for the carbon fiber powder to move inside the slurry, ensuring the uniformity of carbon fiber dispersion. When the storage bin 11 is full of semi-solid composite slurry, the auxiliary screw 71 stops rotating and drives the main screw 61 to move forward at an injection speed of 2 m / s through the injection drive device 63 to squeeze the semi-solid composite slurry into the molding cavity 110. Then the die casting mold 100 is closed, and an injection pressure of 150 MPa is applied through the injection drive device 63. After holding the pressure for 10 seconds, the die casting mold 100 is opened and the magnesium-based composite casting is taken out.

[0122] The short carbon fiber reinforced AZ91D magnesium matrix composite material obtained by this preparation method has good mechanical properties, with a hardness of over 100 HV and a tensile strength of 258 MPa.

[0123] Example 2

[0124] Reference Figure 1There are three feeding positions 2. The three feeding positions 2 are called the first feeding position 21, the second feeding position 22 and the third feeding position 23 respectively from the rear end to the front end of the material pipe 1. Once the preparation process begins, the heating assembly 5 is first activated, dividing the feed pipe 1 into five temperature zones from the rear to the front. These five temperature zones are set to 480℃, 580℃, 590℃, 605℃, and 605℃ respectively, with a preheating time of 60 minutes. Then, AM60B magnesium alloy particles are added to the main hopper 31, and nickel-plated carbon fiber powder (50-300μm in length and 5μm in diameter) is added to the auxiliary hopper 41. Subsequently, the main screw 61 is driven to rotate via the main drive device 62 at a speed of 200 r / min. The AM60B magnesium alloy particles gradually move towards the forming cavity 110 of the die-casting mold 100 under the pushing action of the main screw 61. Simultaneously, the AM60B magnesium alloy particles are gradually heated to a semi-solid state, forming a semi-solid slurry, which mainly consists of approximately 95% liquid phase and approximately 5% spherical α-Mg solid phase. Once the magnesium alloy raw material fills the feed pipe 1, the auxiliary hopper 41 is moved to the first material level 21, and then... The auxiliary drive device 72 drives the auxiliary screw 71 to rotate, and the rotation speed of the auxiliary screw 71 is set to 100 r / min. The carbon fiber powder added to the auxiliary hopper 41 is mixed into the semi-solid slurry in the feed pipe 1 under the strong push of the auxiliary screw 71. The rotating main screw 61 shears and stirs the semi-solid slurry and carbon fiber powder to make them fully mixed. Some of the agglomerated carbon fiber powder is dispersed under the action of shear force. The viscous slurry makes it difficult for the carbon fiber powder to move inside the slurry, ensuring the uniformity of carbon fiber dispersion. When the storage bin 11 is full of semi-solid composite slurry, the auxiliary screw 71 stops rotating and drives the main screw 61 to move forward at an injection speed of 2 m / s through the injection drive device 63 to squeeze the semi-solid composite slurry into the molding cavity 110. Then the die casting mold 100 is closed, and an injection pressure of 150 MPa is applied through the injection drive device 63. After holding the pressure for 10 seconds, the die casting mold 100 is opened and the magnesium-based composite casting is taken out.

[0125] The short carbon fiber reinforced AM60B magnesium matrix composite material obtained by this preparation method has good mechanical properties, with a hardness of over 100 HV and a tensile strength of 230 MPa.

[0126] It should be noted that other aspects of the magnesium-based composite material molding equipment disclosed in this utility model can be found in the prior art, and will not be repeated here.

[0127] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A magnesium-based composite material molding equipment, characterized in that, include: The material tube has its front end connected to the forming cavity of the die-casting mold, and at least two feeding positions are spaced apart along the length of the material tube; The main feeding mechanism is used to feed the magnesium alloy matrix into the rear end of the feed tube; A secondary feeding mechanism is movably disposed along the length of the feed tube, and the secondary feeding mechanism is used to feed carbon fiber powder into the inner cavity of the feed tube at any of the feeding positions; A heating assembly for heating the inner cavity of the feed tube; The main pushing component is disposed inside the feed tube; the main pushing component is used to push the magnesium alloy matrix supplied by the main feeding mechanism forward, so that the magnesium alloy matrix melts under the heating action of the heating component to form a semi-solid slurry, and mixes with the carbon fiber powder supplied by the auxiliary feeding mechanism to form a semi-solid composite slurry; the main pushing component is also used to further push the mixed semi-solid composite slurry forward into the forming cavity for die casting.

2. The magnesium-based composite material molding equipment as described in claim 1, characterized in that, The main pushing component includes a main screw and a main driving device. The main screw is disposed in the inner cavity of the material tube, and the main driving device is connected to the main screw. The main driving device is used to drive the main screw to rotate, so as to push the magnesium alloy substrate fed by the main feeding mechanism forward.

3. The magnesium-based composite material molding equipment as described in claim 2, characterized in that, The front end of the material tube is provided with a storage bin; the main pushing component also includes an injection driving device, which is connected to the main screw; when the semi-solid composite slurry formed by mixing enters the storage bin under the drive of the rotating main screw, the injection driving device is used to drive the main screw to move forward so as to squeeze the semi-solid composite slurry in the storage bin into the molding cavity.

4. The magnesium-based composite material molding equipment as described in claim 1, characterized in that, The magnesium-based composite material molding equipment also includes a secondary pushing component; the secondary pushing component is used to push the carbon fiber powder supplied by the secondary feeding mechanism into the inner cavity of the feed pipe, so that the carbon fiber powder mixes with the semi-solid slurry in the feed pipe to form a semi-solid composite slurry.

5. The magnesium-based composite material molding equipment as described in claim 4, characterized in that, The auxiliary pushing component includes an auxiliary screw and an auxiliary driving device. The auxiliary screw is disposed in the auxiliary feeding mechanism, and the auxiliary driving device is connected to the auxiliary screw. The auxiliary driving device is used to drive the auxiliary screw to rotate, so as to drive the carbon fiber powder supplied by the auxiliary feeding mechanism into the inner cavity of the material tube.

6. The magnesium-based composite material molding equipment according to any one of claims 1 to 5, characterized in that, The main feeding mechanism is configured as a main hopper, which has a funnel-shaped structure.

7. The magnesium-based composite material molding equipment according to any one of claims 1 to 5, characterized in that, The auxiliary feeding mechanism is configured as an auxiliary hopper, which has a funnel-shaped structure.

8. The magnesium-based composite material molding equipment according to any one of claims 1 to 5, characterized in that, The heating assembly includes multiple heating units, which are arranged at intervals along the length of the material tube.

9. The magnesium-based composite material molding equipment according to any one of claims 1 to 5, characterized in that, The magnesium-based composite material molding equipment also includes a guide rail, which passes through each of the feeding positions in sequence; the auxiliary feeding mechanism is slidably fitted on the guide rail to move to any of the feeding positions.

10. The magnesium-based composite material molding equipment according to any one of claims 1 to 5, characterized in that, The auxiliary feeding mechanism is used to feed nickel-plated carbon fiber into the inner cavity of the feed tube at any of the feeding positions.

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