Aluminum-based silicon carbide composite material and injection molding preparation process

Abstract

The invention relates to the technical field of aluminum-based silicon carbide material preparation, in particular to an aluminum-based silicon carbide composite material and an injection molding preparation process. Comprising the following steps: step 1, weighing aluminum powder, magnesium powder, silicon carbide powder, silicon carbide particles, phenolic resin powder and polytetrafluoroethylene powder according to the weight components, and uniformly stirring and mixing; 2, heating the mixed powder to 660 DEG C in a smelting furnace, adding silicon carbide particles, and continuously heating to 700-800 DEG C; step 3, adding the uniformly mixed aluminum-based silicon carbide composite material melt into an injection molding device for injection molding to obtain a green body; and 4, the green body is sequentially subjected to heat treatment, machining and surface treatment operation, and the formed aluminum-based silicon carbide composite material is obtained. The preparation process disclosed by the invention is relatively simple and efficient, and the integrity of the process is relatively good.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-based silicon carbide material preparation, and in particular to an aluminum-based silicon carbide composite material and an injection molding preparation process. Background Art

[0002] Aluminum-based silicon carbide (AlSiC) particle reinforced composite material combines the characteristics of aluminum alloy matrix, such as high specific strength, good plastic processing, and low density, and the advantages of SiC particles, such as high hardness and low thermal expansion coefficient. It is a metal-based composite material with excellent comprehensive performance. It can be used to solve the problem of thermal failure of electronic circuits and is a special packaging material for electronic components. AlSiC has high thermal conductivity (180240W / mK) and adjustable thermal expansion coefficient (6.59.5×10^-6 / K), low density, high specific stiffness (stiffness divided by density), and better seismic resistance than ceramics. It can be flexibly designed according to the specific requirements of users, has good processability and plating properties, and good air tightness.

[0003] There are various preparation processes for aluminum-based silicon carbide composite materials, among which the injection molding preparation process is an efficient molding method, which is particularly suitable for producing relatively complex heterogeneous structural parts. Through the injection molding preparation process, aluminum-based silicon carbide composite materials can be processed into various parts with complex shapes to meet the needs of different fields. In the prior art, the injection molding equipment for aluminum-based silicon carbide composite materials usually uses multiple devices, which has poor integrity and a relatively complicated process.

[0004] In summary, how to solve the problem in the prior art that the injection molding equipment for aluminum-based silicon carbide composite materials usually uses multiple devices, has poor integrity, and has a relatively complicated process has become a difficult problem that needs to be urgently solved in this field. Therefore, it is necessary to propose an aluminum-based silicon carbide composite material and an injection molding preparation process. Summary of the invention

[0005] To solve the above problems, the present invention provides an aluminum-based silicon carbide composite material and an injection molding preparation process, which improves the structure of the injection molding device, improves the overall performance and stability of the equipment, reduces the connection and conversion between multiple devices, and thus improves the integrity.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an aluminum-based silicon carbide composite material, comprising the following components by weight: 50-70 parts of aluminum powder, 5-15 parts of magnesium powder, 10-20 parts of silicon carbide powder, 5-16 parts of silicon carbide particles, 2-6 parts of phenolic resin powder and 1-2 parts of polytetrafluoroethylene powder.

[0007] The aluminum-based silicon carbide composite material injection molding preparation process includes the following steps:

[0008] Step 1: Weigh aluminum powder, magnesium powder, silicon carbide powder, silicon carbide particles, phenolic resin powder and polytetrafluoroethylene powder according to weight components, stir and mix them evenly to obtain a mixed powder.

[0009] Step 2: After heating the mixed powder to 660° C. in a melting furnace, add silicon carbide particles, and continue heating to 700° C.-800° C. to obtain a uniformly mixed aluminum-based silicon carbide composite material melt.

[0010] Step 3: Add the evenly mixed aluminum-based silicon carbide composite material melt into an injection molding device, maintain the temperature at 700°C-800°C, and the injection pressure at 50-150MPa, and perform injection molding operation to obtain a green body of the aluminum-based silicon carbide composite material.

[0011] Step 4: sequentially subjecting the green body of the aluminum-based silicon carbide composite material to heat treatment, machining and surface treatment to obtain a formed aluminum-based silicon carbide composite material.

[0012] The technical principles of the above scheme are as follows:

[0013] Aluminum powder and magnesium powder are used as matrix materials to provide the main structure and mechanical properties of the composite material; silicon carbide powder and silicon carbide particles are used as reinforcing phases to improve the hardness and wear resistance of the composite material; phenolic resin powder is used as an adhesive to tightly combine the components together; polytetrafluoroethylene powder is used as a lubricant to reduce the friction resistance of the material during the molding process; at the same time, by improving the structure of the injection molding device, the injection molding device can integrate the functions of cooling, injection, heating and replenishment.

[0014] The above scheme has the following beneficial effects:

[0015] 1. The present invention optimizes the components of the aluminum-based silicon carbide composite material so that the composite material has good plasticity and processability while ensuring high hardness and high wear resistance. This is due to the reasonable ratio of aluminum powder and magnesium powder, as well as the reinforcing effect of silicon carbide powder and particles, so that the composite material has a wide range of application prospects in the fields of electronic packaging.

[0016] 2. The present invention improves the overall performance and stability of the equipment by improving the structure of the injection molding device, reduces the connection and conversion between multiple devices, thereby simplifying the process flow and improving production efficiency; the injection molding device that integrates cooling, liquid injection, heating and liquid replenishment functions makes the entire preparation process more efficient, continuous and stable, and reduces production costs and energy consumption.

[0017] 3. The aluminum-based silicon carbide composite material and injection molding preparation process provided by the present invention not only optimize the components and properties of the composite material, but also simplify the preparation process, improve production efficiency and product quality, and provide technical support for the application of aluminum-based silicon carbide composite materials in the fields of electronic packaging.

[0018] Furthermore, the injection molding device includes a base and a controller.

[0019] A conveyor belt is fixedly connected to the base, a controller is used to control the operation of the conveyor belt, and a plurality of molds are detachably connected to the conveyor belt.

[0020] The base is also fixedly connected to a driving bracket, a side wall of the driving bracket is provided with a slide groove, a first slider is slidably matched in the slide groove, and an L-shaped groove is provided on the slide groove; the first slider is provided with an oblique groove, a second slider is slidably matched in the oblique groove, one end of the second slider is fixedly connected to a first limit block, a side wall of the first limit block away from the second slider is fixedly connected to a support rod, and an end of the support rod away from the first limit block is provided with a liquid injection component for injecting the aluminum-based silicon carbide composite material into the mold;

[0021] A rectangular block is fixedly connected to one end of the second sliding block away from the first limiting block, and the rectangular block and the L-shaped groove are slidably matched; a side wall of the rectangular block away from the second sliding block is fixedly connected to the second limiting block;

[0022] A first connecting rod is hinged on one side wall of the first sliding block, a second connecting rod is hinged on one end of the first connecting rod away from the first sliding block, and a driving component for driving the first sliding block to slide on the sliding groove is provided on the second connecting rod;

[0023] A conveyor belt is also fixedly connected to the base, and the controller is used to control the operation of the conveyor belt; a cooling component for cooling the mold on the conveyor belt is sleeved on the outer side of the conveyor belt;

[0024] The top of the base is also fixedly connected with a fluid replenishing box, and the fluid replenishing box is provided with a fluid replenishing component for replenishing the fluid injection component.

[0025] Beneficial effects: By improving the structure of the injection molding device, the overall performance and stability of the equipment are improved, and the connection and conversion between multiple devices are reduced, thereby simplifying the process and improving production efficiency.

[0026] Furthermore, the injection assembly includes a first reduction motor, which is fixedly connected to the end of the support rod away from the second slider, and the controller is used to control the operation of the first reduction motor; the bottom of the first reduction motor is fixedly connected to the injection cylinder, the output shaft of the first reduction motor passes through the top wall of the injection cylinder and extends into the injection cylinder and is coaxially fixedly connected with a spiral rod; the outer shell of the injection cylinder is connected to a heater, and the controller is used to control the operation of the heater; the bottom of the injection cylinder is connected to a liquid injection nozzle; the outer side wall of the injection cylinder is connected to a liquid replenishing tube.

[0027] Beneficial effect: Through the precise control of the first reduction motor, the speed of the spiral rod in the injection cylinder can be adjusted, thereby accurately controlling the injection speed of the aluminum-based silicon carbide composite material melt, ensuring uniform filling of the material in each mold, and improving the molding quality and consistency of the product.

[0028] Furthermore, the driving assembly includes a driving support rod, a driving box is fixedly connected to the upper side wall of the driving support rod, a second reduction motor is fixedly connected to the inner bottom wall of the driving box, an output shaft of the second reduction motor passes through the driving support rod and is fixedly connected to an end of the second connecting rod away from the first connecting rod, and a controller is used to control the operation of the second reduction motor.

[0029] Beneficial effects: Through the automated drive of the second reduction motor, precise control of the first slider and the second connecting rod is achieved, thereby driving the movement and positioning of the injection assembly above the mold, reducing reliance on manual operation and improving production efficiency and automation.

[0030] Furthermore, the cooling assembly includes a cooling cylinder, the bottom of which is fixedly connected to the top of the base, and the cooling cylinder is sleeved on the outside of the conveyor belt; a plurality of air nozzles are fixedly connected to the inner wall of the cooling cylinder; a switch assembly for intermittently delivering cooling gas to the air nozzles is provided on the output shaft of the second reduction motor.

[0031] Beneficial effects: The cooling gas is delivered to the mold at intervals through the air nozzle in the cooling cylinder, which achieves rapid cooling of the mold and the aluminum-based silicon carbide composite green body therein, helps to shorten the production cycle, while avoiding material deformation or cracking caused by uneven cooling, and improving product quality and stability.

[0032] Furthermore, the switch assembly includes an air supply pipe and a cam coaxially fixedly connected to the output shaft of the second reduction motor; one end of the air supply pipe passes through the side wall of the drive box and is connected to the air nozzle; a through groove is opened at the bottom of the air supply pipe, and a baffle is slidably fitted in the through groove, and the top of the baffle passes through the bottom of the air supply pipe and extends into the air supply pipe; a push rod is fixedly connected to the bottom of the baffle, and the bottom end of the push rod is located directly above the cam.

[0033] Beneficial effect: Through the cooperation of the cam and the push rod, the periodic control of the baffle position is achieved, and then the air supply pipe is opened or closed intelligently, and the intermittent delivery of the cooling gas is achieved, which not only ensures the cooling effect but also avoids unnecessary energy waste.

[0034] Furthermore, the rehydration component includes a rehydration pump, which is fixedly connected to the bottom wall of the rehydration tank. The output end of the rehydration pump and the rehydration tube are detachably connected and communicated, and the controller is used to control the operation of the rehydration pump.

[0035] Beneficial effects: The refilling pump can automatically refill the liquid, ensuring the continuity and stability of the injection process, avoiding production interruptions due to material shortage, and improving production efficiency.

[0036] Furthermore, a one-way valve is connected in the infusion tube.

[0037] Beneficial effect: The setting of the one-way valve effectively prevents the backflow phenomenon during the liquid replenishment process, ensuring that the aluminum-based silicon carbide composite material molten liquid in the liquid replenishment pipe will not flow back to the liquid replenishment tank due to pressure changes.

[0038] Furthermore, a camera is fixedly connected to the bottom of the injection cylinder, and the controller is used to receive the position information of the mold on the conveyor belt sent by the camera.

[0039] Beneficial effect: The controller can receive the image signal sent by the camera at the bottom of the injection cylinder to determine whether the injection hole of the mold is aligned with the injection nozzle, so as to achieve subsequent effects.

[0040] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is an axonometric view of the injection molding device in an embodiment of the present invention.

[0042] Figure 2 It is a front view of the injection molding device in an embodiment of the present invention.

[0043] Figure 3 It is a rear view of the injection molding device in the embodiment of the present invention.

[0044] Figure 4 It is a front cross-sectional view of the liquid injection assembly in an embodiment of the present invention.

[0045] Figure 5 It is a side sectional view of the injection molding device in an embodiment of the present invention.

[0046] Figure 6 It is a side sectional view of the drive box in the embodiment of the present invention.

[0047] The figure marks in the drawings of the specification include: 1. base; 2. drive bracket; 3. first slider; 4. L-shaped groove; 5. inclined groove; 6. second slider; 7. first limit block; 8. support rod; 9. rectangular block; 10. second limit block; 11. first connecting rod; 12. second connecting rod; 13. conveyor belt; 14. liquid replenishing tank; 15. first reduction motor; 16. liquid injection cylinder; 17. screw rod; 18. heater; 19. liquid injection nozzle; 20. liquid replenishing tube; 21. mold; 22. drive support rod; 23. drive box; 24. second reduction motor; 25. cooling cylinder; 26. air nozzle; 27. air supply pipe; 28. cam; 29. ​​baffle; 30. push rod; 31. one-way valve; 32. camera. DETAILED DESCRIPTION

[0048] The following is further described in detail through specific implementation methods:

[0049] Embodiment 1:

[0050] An aluminum-based silicon carbide composite material comprises the following components by weight: 50 parts of aluminum powder, 5 parts of magnesium powder, 10 parts of silicon carbide powder, 5 parts of silicon carbide particles, 2 parts of phenolic resin powder and 1 part of polytetrafluoroethylene powder.

[0051] The aluminum-based silicon carbide composite material injection molding preparation process includes the following steps:

[0052] Step 1: Weigh aluminum powder, magnesium powder, silicon carbide powder, silicon carbide particles, phenolic resin powder and polytetrafluoroethylene powder according to weight components, stir and mix them evenly to obtain a mixed powder.

[0053] Step 2: After heating the mixed powder to 660° C. in a melting furnace, add silicon carbide particles and continue heating to 700° C. to obtain a uniformly mixed aluminum-based silicon carbide composite material melt.

[0054] Step 3: Add the evenly mixed aluminum-based silicon carbide composite material melt into an injection molding device, maintain the temperature at 700° C. and the injection pressure at 100 MPa, and perform injection molding to obtain a green body of the aluminum-based silicon carbide composite material.

[0055] Step 4: sequentially subjecting the green body of the aluminum-based silicon carbide composite material to heat treatment, machining and surface treatment to obtain a formed aluminum-based silicon carbide composite material.

[0056] Aluminum powder and magnesium powder are used as matrix materials to provide the main structure and mechanical properties of the composite material; silicon carbide powder and silicon carbide particles are used as reinforcing phases to improve the hardness and wear resistance of the composite material; phenolic resin powder is used as a binder to tightly combine the components together; polytetrafluoroethylene powder is used as a lubricant to reduce the friction resistance of the material during the molding process; at the same time, by improving the structure of the injection molding device, the injection molding device can integrate the functions of cooling, injection, heating and replenishment, thereby improving the overall performance and stability of the equipment, reducing the connection and conversion between multiple devices, thereby simplifying the process flow and improving production efficiency; the injection molding device that integrates cooling, injection, heating and replenishment functions makes the entire preparation process more efficient, continuous and stable, and reduces production costs and energy consumption.

[0057] Embodiment 2:

[0058] As attached Figure 1-Figure 6 As shown, the difference from Embodiment 1 is that the injection molding device includes a base 1 and a controller.

[0059] A conveyor belt 13 is fixedly connected to the base 1 by bolts. The controller is used to control the operation of the conveyor belt 13. A plurality of molds 21 are detachably clamped on the conveyor belt 13.

[0060] A driving bracket 2 is also fixedly connected to the base 1 by bolts, a sliding groove is opened on the side wall of the driving bracket 2, a first sliding block 3 is slidably fitted in the sliding groove, and an L-shaped groove 4 is opened on the sliding groove; an inclined groove 5 is opened on the first sliding block 3, a second sliding block 6 is slidably fitted in the inclined groove 5, a first limit block 7 is integrally formed at one end of the second sliding block 6, a side wall of the first limit block 7 away from the second sliding block 6 is fixedly connected to a support rod 8 by bolts, and an end of the support rod 8 away from the first limit block 7 is provided with an injection component for injecting aluminum-based silicon carbide composite material into the mold 21.

[0061] The injection assembly includes a first reduction motor 15, which is fixedly connected to the end of the support rod 8 away from the first limit block 7 by bolts, and the controller is used to control the operation of the first reduction motor 15; the bottom of the first reduction motor 15 is fixedly connected to the injection cylinder 16 by bolts, and the output shaft of the first reduction motor 15 passes through the top wall of the injection cylinder 16 and extends into the injection cylinder 16 and is coaxially fixedly connected to the spiral rod 17 by bolts.

[0062] A heater 18 is connected to the outer shell of the liquid injection cylinder 16 , and the controller is used to control the operation of the heater 18 .

[0063] The bottom of the injection cylinder 16 is connected to a liquid injection nozzle 19 ; the outer wall of the injection cylinder 16 is connected to a liquid replenishing pipe 20 , and the inside of the liquid replenishing pipe 20 is connected to a one-way valve 31 .

[0064] A camera 32 is fixedly connected to the bottom of the injection cylinder 16 by screws. The controller is used to receive the position information of the mold 21 on the conveyor belt 13 sent by the camera 32, and control the operation of the conveyor belt 13 based on the position information of the mold 21.

[0065] The second sliding block 6 is fixedly connected to a rectangular block 9 at one end away from the first limiting block 7 by bolts, and the rectangular block 9 and the L-shaped groove 4 are slidably matched; a second limiting block 10 is integrally formed on one side wall of the rectangular block 9 away from the second sliding block 6.

[0066] A first connecting rod 11 is hinged on one side wall of the first sliding block 3 , a second connecting rod 12 is hinged on one end of the first connecting rod 11 away from the first sliding block 3 , and a driving component for driving the first sliding block 3 to slide on the sliding groove is provided on the second connecting rod 12 .

[0067] The driving assembly includes a driving support rod 22, on the upper side wall of which a driving box 23 is fixedly connected by bolts, and the inner bottom wall of the driving box 23 is fixedly connected to a second reduction motor 24 by bolts, and the output shaft of the second reduction motor 24 passes through the driving support rod 22 and is fixedly connected to the end of the second connecting rod 12 away from the first connecting rod 11 by bolts, and the controller is used to control the operation of the second reduction motor 24.

[0068] A conveyor belt 13 is also fixedly connected to the base 1 by bolts, and the controller is used to control the operation of the conveyor belt; a cooling component for cooling the mold 21 on the conveyor belt 13 is sleeved on the outer side of the conveyor belt 13 .

[0069] The cooling assembly includes a cooling cylinder 25, the bottom of which is fixedly connected to the top of the base 1 by bolts, and the cooling cylinder 25 is sleeved on the outside of the conveyor belt 13; a plurality of air nozzles 26 are fixedly connected to the inner wall of the cooling cylinder 25 by screws.

[0070] A switch assembly for delivering cooling gas to the gas nozzle 26 at intervals is provided on the output shaft of the second reduction motor 24 .

[0071] The switch assembly includes an air supply pipe 27 and a cam 28 coaxially fixedly connected to the output shaft of the second reduction motor 24 by bolts; one end of the air supply pipe 27 passes through the side wall of the drive box 23 and is connected to the air nozzle 26.

[0072] A through groove is formed at the bottom of the air supply pipe 27, and a baffle 29 is slidably fitted in the through groove. The top of the baffle 29 passes through the bottom of the air supply pipe 27 and extends into the air supply pipe 27; a push rod 30 is integrally formed at the bottom of the baffle 29, and the bottom end of the push rod 30 is located directly above the cam 28.

[0073] The top of the base 1 is also fixedly connected with a liquid replenishing box 14 by bolts, and the liquid replenishing box 14 is provided with a liquid replenishing component for replenishing the liquid injection component.

[0074] The rehydration assembly includes a rehydration pump, which is fixedly connected to the inner bottom wall of the rehydration tank 14 by bolts. The output end of the rehydration pump and the rehydration tube 20 are detachably connected and communicated, and the controller is used to control the operation of the rehydration pump.

[0075] The specific implementation process is as follows:

[0076] The molten liquid of the aluminum-based silicon carbide composite material prepared in Example 1 is connected to the input end of the liquid replenishment pump in the liquid replenishment tank 14, and several different types of molds 21 to be injection molded are installed on the conveyor belt 13. At the same time, it is ensured that the mold 21 is accurately placed in the middle of the conveyor belt 13, and low-temperature nitrogen is introduced into one end of the air supply pipe 27.

[0077] The controller starts the output shaft of the second reduction motor 24 to rotate half a circle clockwise and then stop. At the same time, the controller starts the conveyor belt 13 to run. Figure 6 For example, when the output shaft of the second reduction motor 24 rotates, the second connecting rod 12 starts to rotate. Figure 1 For example, since the first connecting rod 11 is hinged to the side wall of the first slider 3 at one end away from the second connecting rod 12, the second connecting rod 12 can rotate to make a crank motion, thereby driving the first connecting rod 11 and then driving the first slider 3 to slide back and forth horizontally in the slide groove on the driving bracket 2, thereby driving the support rod 8, and then driving the first reduction motor 15, and then driving the injection cylinder 16 to make a horizontal reciprocating motion. Under the action of the first limit block 7 and the second limit block 10, the support rod 8 can be prevented from escaping from the inclined groove 5 and the L-shaped groove 4.

[0078] by Figure 1 , Figure 2 and Figure 6 For example, when the first slider 3 slides back and forth in the slide groove, the second slider 6 slides in the inclined groove 5, and when the output shaft of the second reduction motor 24 rotates half a circle, the second slider 6 Figure 1 When sliding from the rightmost side to the leftmost side, the rectangular block 9 can be driven to slide to the left in the L-shaped groove 4. At this time, the rectangular block 9 slides in the L-shaped groove 4 and cooperates with the rectangular block 9. At the same time, the limiting effect of the L-shaped groove 4 on the rectangular block 9 can prevent the rectangular block 9 from rotating when sliding in the L-shaped groove 4. When the rectangular block 9 slides to the leftmost side, due to the effect of gravity, the rectangular block 9 can move to the bottom of the L-shaped groove 4, thereby driving the injection cylinder 16 to make an "L"-shaped movement to the left. By setting the middle position on the conveyor belt 13 to be aligned with the bottom of the L-shaped groove 4, when the injection cylinder 16 moves to the bottom of the L-shaped groove 4, Figure 4 For example, at this time, the injection nozzle 19 at the bottom of the injection cylinder 16 can be inserted into the injection hole on the mold 21 on the conveyor belt 13. At this time, the controller starts to receive the image signal sent by the camera 32 at the bottom of the injection cylinder 16, and determines whether the injection hole of the mold 21 is aligned with the injection nozzle 19. When the injection nozzle 19 is aligned with the injection hole on the mold 21, the controller sends a control signal to control the rotation of the first reduction motor 15. At this time, the rotation of the first reduction motor 15 can drive the screw rod 17 whose output shaft is fixed by bolts to rotate for 30 seconds. When the screw rod 17 rotates, the molten liquid of the aluminum-based silicon carbide composite material in the injection cylinder 16 can be injected into the mold 21 through the injection nozzle 19 at the bottom for molding. At this time, the heater 18 connected to the outside of the injection cylinder 16 can heat the injection cylinder 16 so that the liquid inside the injection cylinder 16 remains in liquid state to prevent the internal aluminum-based silicon carbide composite material from clogging the injection nozzle 19 due to condensation.

[0079] After the controller controls the spiral rod 17 to rotate for 30 seconds, the controller sends a control signal to stop the output shaft of the first reduction motor 15 from rotating. At this time, the injection nozzle 19 stops injecting liquid. The controller then sends a control signal to control the second reduction motor 24 to continue rotating half a circle clockwise and then stop. At this time, the second connecting rod 12 can drive the first connecting rod 11 and then drive the first slider 3 to slide to the right in the slide groove. Figure 2 For example, when the first slider 3 slides to the right, due to the guiding effect of the oblique setting of the inclined groove 5, when the first slider 3 moves to the right, it can drive the second slider 6 and then drive the rectangular block 9 to move upward at the bottom of the L-shaped groove 4. At this time, the injection cylinder 16 can move upward and make the injection nozzle 19 leave the mold 21.

[0080] At the same time, when the rectangular block 9 moves to the corner of the L-shaped groove 4, the inclined groove 5 can continue to drive the second slider 6 and then drive the rectangular block 9 to move to the right, and the injection cylinder 16 also moves to the right. Figure 2 and Figure 4 For example, when the injection cylinder 16 moves to the far right, the infusion tube 20 on the injection cylinder 16 is just engaged with the output end of the infusion pump in the infusion tank 14. At this time, the controller immediately sends a control signal to control the infusion pump to pump the molten liquid of the aluminum-based silicon carbide composite material into the injection cylinder 16 through the infusion tube 20. At the same time, the one-way valve 31 connected to the infusion tube 20 can prevent the molten liquid of the aluminum-based silicon carbide composite material in the injection cylinder 16 from leaking out, thereby realizing the function of replenishing the molten liquid of the aluminum-based silicon carbide composite material to the injection cylinder 16.

[0081] The cooling of the aluminum-based silicon carbide composite material after liquid injection is the key to the process flow. When the injection cylinder 16 moves upward so that the injection nozzle 19 leaves the mold 21, the controller immediately sends a control signal to control the conveyor belt 13 to continue running. At this time, the mold 21 after liquid injection can enter the cooling cylinder 25. Since low-temperature nitrogen is introduced into one end of the air supply pipe 27, the air nozzle 26 in the cooling cylinder 25 is connected to the air supply pipe 27. At this time, low-temperature nitrogen can be sprayed from the air nozzle 26 to cool the mold 21 after liquid injection. At the same time, low-temperature nitrogen can maximize the avoidance of oxidation reaction between the surface of the aluminum-based silicon carbide composite material after liquid injection and other impurity gases during the cooling process, thereby ensuring the process production quality of the aluminum-based silicon carbide composite material.

[0082] by Figure 6For example, during the rotation of the output shaft of the second reduction motor 24, the cam 28 can be driven to rotate and then the push rod 30 can be driven to drive the baffle 29 to slide up and down in the slide groove at the bottom of the air supply pipe 27, so as to form a valve effect. When the baffle 29 slides upward, the air flow channel in the air supply pipe 27 can be closed and the air supply to the air nozzle 26 can be stopped. When the baffle 29 slides downward, the air flow channel in the air supply pipe 27 can be opened, and the air supply to the air nozzle 26 can continue. When the cam 28 rotates, the effect of intermittent air supply to the air nozzle 26 can be formed. This intermittent air supply effect can ensure that the cooling process of the aluminum-based silicon carbide composite material during molding is more uniform and efficient. Specifically, after the mold 21 is injected with molten aluminum-based silicon carbide composite material, a certain cooling time is required to ensure that the material can be fully solidified and achieve the expected mechanical properties. The intermittent air supply method can make the mold 21 experience multiple temperature fluctuations during the cooling process. This fluctuation helps to promote heat conduction and uniform cooling inside the material, and reduce internal stress and defects caused by excessive temperature gradients.

[0083] In addition, intermittent air supply can also adjust the cooling rate to a certain extent, making the cooling process more controllable. By adjusting the shape and rotation speed of the cam 28 and the matching relationship between the baffle 29 and the cam 28, the frequency and duration of air supply can be accurately controlled, thereby achieving precise regulation of the cooling process. This regulation is crucial to optimizing the microstructure of the product and improving the performance of the final product.

[0084] When the mold 21 completes the cooling process in the cooling cylinder 25, the conveyor belt 13 will continue to transport it to the next process for subsequent processing. At this time, the controller will send a control signal to turn off the supply of low-temperature nitrogen and stop the operation of the conveyor belt 13. The operator can remove the cooled mold 21, check the quality of the molded product, and perform necessary subsequent processing or testing.

[0085] The injection molding device achieves efficient and precise injection molding of aluminum-based silicon carbide composites through ingenious mechanical design and precise control system. The intermittent air supply cooling method not only improves the cooling efficiency and uniformity of the product, but also optimizes the microstructure and final performance of the product.

[0086] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An aluminum-based silicon carbide composite material, characterized in that: The invention comprises the following components by weight: 50-70 parts of aluminum powder, 5-15 parts of magnesium powder, 10-20 parts of silicon carbide powder, 5-16 parts of silicon carbide particles, 2-6 parts of phenolic resin powder and 1-2 parts of polytetrafluoroethylene powder.

2. The injection molding preparation process of aluminum-based silicon carbide composite material according to claim 1, characterized in that: The following steps are involved: Step 1: Weigh aluminum powder, magnesium powder, silicon carbide powder, silicon carbide particles, phenolic resin powder and polytetrafluoroethylene powder according to weight components, stir and mix them evenly to obtain a mixed powder; Step 2: After heating the mixed powder to 660° C. in a smelting furnace, adding silicon carbide particles, and continuing to heat to 700° C.-800° C. to obtain a uniformly mixed aluminum-based silicon carbide composite material melt; Step 3: adding the uniformly mixed aluminum-based silicon carbide composite material melt into an injection molding device, maintaining the temperature at 700° C.-800° C. and the injection pressure at 50-150 MPa, and performing injection molding operation to obtain a green body of the aluminum-based silicon carbide composite material; Step 4: sequentially subjecting the green body of the aluminum-based silicon carbide composite material to heat treatment, machining and surface treatment operations to obtain a formed aluminum-based silicon carbide composite material.

3. The injection molding preparation process of the aluminum-based silicon carbide composite material according to claim 2, characterized in that: The injection molding device comprises a base (1) and a controller; A conveyor belt (13) is fixedly connected to the base (1), a controller is used to control the operation of the conveyor belt (13), and a plurality of molds (21) are detachably connected to the conveyor belt (13); The base (1) is also fixedly connected to a driving bracket (2), a sliding groove is provided on the side wall of the driving bracket (2), a first sliding block (3) is slidably fitted in the sliding groove; an L-shaped groove (4) is provided on the sliding groove; The first slider (3) is provided with an inclined groove (5), a second slider (6) is slidably fitted in the inclined groove (5), one end of the second slider (6) is fixedly connected to a first limit block (7), a side wall of the first limit block (7) away from the second slider (6) is fixedly connected to a support rod (8), and an end of the support rod (8) away from the first limit block (7) is provided with a liquid injection component for injecting the aluminum-based silicon carbide composite material into the mold (21); A rectangular block (9) is fixedly connected to one end of the second sliding block (6) away from the first limiting block (7), and the rectangular block (9) and the L-shaped groove (4) are slidably matched; a second limiting block (10) is fixedly connected to one side wall of the rectangular block (9) away from the second sliding block (6); A first connecting rod (11) is hingedly connected to a side wall of the first sliding block (3); a second connecting rod (12) is hingedly connected to an end of the first connecting rod (11) away from the first sliding block (3); and a driving component for driving the first sliding block (3) to slide on the sliding groove is provided on the second connecting rod (12); The outer side of the conveyor belt (13) is provided with a cooling component for cooling the mold (21) on the conveyor belt (13); The top of the base (1) is also fixedly connected to a fluid replenishment box (14), and a fluid replenishment component for replenishing fluid in the fluid injection component is arranged in the fluid replenishment box (14).

4. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 3, characterized in that: The liquid injection assembly comprises a first reduction motor (15), the first reduction motor (15) is fixedly connected to an end of the support rod (8) away from the first limit block (7), and the controller is used to control the operation of the first reduction motor (15); The bottom of the first reduction motor (15) is fixedly connected to a liquid injection cylinder (16); the output shaft of the first reduction motor (15) penetrates the top wall of the liquid injection cylinder (16) and extends into the liquid injection cylinder (16) and is coaxially fixedly connected to a spiral rod (17); the outer shell of the liquid injection cylinder (16) is connected to a heater (18); and the controller is used to control the operation of the heater (18); The bottom of the liquid injection cylinder (16) is connected to a liquid injection nozzle (19); the outer side wall of the liquid injection cylinder (16) is connected to a liquid replenishing pipe (20).

5. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 4, characterized in that: The driving assembly comprises a driving support rod (22), a driving box (23) is fixedly connected to the upper side wall of the driving support rod (22), and a second reduction motor (24) is fixedly connected to the inner bottom wall of the driving box (23); an output shaft of the second reduction motor (24) passes through the driving support rod (22) and is fixedly connected to an end of the second connecting rod (12) away from the first connecting rod (11), and a controller is used to control the operation of the second reduction motor (24).

6. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 5, characterized in that: The cooling assembly comprises a cooling cylinder (25), the bottom of the cooling cylinder (25) is fixedly connected to the top of the base (1), and the cooling cylinder (25) is sleeved on the outside of the conveyor belt (13); A plurality of air nozzles (26) are fixedly connected to the inner wall of the cooling cylinder (25); and a switch assembly for delivering cooling gas to the air nozzles (26) at intervals is provided on the output shaft of the second reduction motor (24).

7. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 6, characterized in that: The switch assembly comprises an air supply pipe (27) and a cam (28) coaxially fixedly connected to the output shaft of the second reduction motor (24); one end of the air supply pipe (27) penetrates the side wall of the drive box (23) and is connected to the air nozzle (26); A through groove is formed at the bottom of the air supply pipe (27), a baffle (29) is slidably fitted in the through groove, and the top of the baffle (29) passes through the bottom of the air supply pipe (27) and extends into the air supply pipe (27); a push rod (30) is fixedly connected to the bottom of the baffle (29), and the bottom end of the push rod (30) is located directly above the cam (28).

8. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 7, characterized in that: The rehydration assembly comprises a rehydration pump, which is fixedly connected to the inner bottom wall of the rehydration tank (14); the output end of the rehydration pump and the rehydration tube (20) are detachably connected and communicated; and the controller is used to control the operation of the rehydration pump.

9. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 8, characterized in that: A one-way valve (31) is connected inside the liquid infusion tube (20).

10. The aluminum-based silicon carbide composite material and injection molding preparation process according to claim 9, characterized in that: A camera (32) is fixedly connected to the bottom of the injection cylinder (16), and a controller is used to receive position information of the mold (21) on the conveyor belt (13) sent by the camera (32), and to control the operation of the conveyor belt (13) based on the position information of the mold (21).

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