Supercharged injection semi-solid magnesium alloy injection device

Abstract

The invention discloses a pressurizing injection semi-solid magnesium alloy injection device, and relates to the technical field of injection devices, the pressurizing injection semi-solid magnesium alloy injection device comprises an injection mechanism, a pressurizing mechanism and a mold closing mechanism, the injection mechanism melts light metal alloy slurry, and the injection mechanism is communicated with a charging barrel of the pressurizing mechanism through a channel; molten light metal alloy slurry is injected into the charging barrel through the channel, the pressurizing mechanism further comprises an injection rod, the injection rod can be axially and movably arranged in the charging barrel, the injection rod injects the molten light metal alloy slurry into the mold closing mechanism to form a workpiece, a flange is arranged at the tail end of the injection mechanism, and the injection mechanism is connected with the injection mechanism. The flange is fixedly connected with the charging barrel, an injection rod is arranged on one side of the pressurizing mechanism, a punch is arranged at one end of the injection rod, and the punch is nested in the charging barrel in a sliding mode. The method has the beneficial effects that the die-casting speed is high, the filling pressurization is large, and the technical advantages of semi-solid injection molding pulping are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection devices, in particular to a semi-solid magnesium alloy injection device with pressure boosting injection. Background Art

[0002] Under the development trend of lightweight in new energy vehicles, light metal alloys, including aluminum alloys, magnesium alloys, magnesium-lithium alloys, etc., have received extensive attention. Light metal alloys have advantages such as low density and high specific strength. If they replace iron parts, significant weight reduction of the structure can be achieved. However, there are still significant gaps in the absolute strength, modulus, and thermal conductivity of traditional light metal alloys compared to iron metals. For example, the elastic modulus of die-cast A356 aluminum alloy commonly used in the industry is 70 GPa, the yield strength is 150 - 170 MPa, and the maximum elongation is about 10%. While the elastic modulus of ordinary Q235 alloy steel reaches 200 GPa, the yield strength is 235 MPa, and the elongation can reach 20%. As a result, in many application scenarios, it is impossible to replace steel with aluminum or magnesium-based materials. The technical content disclosed in the Chinese patent document (Application No.: CN201820904679.0, Patent Name: Semi-solid Magnesium Alloy Dual-barrel Injection System) is as follows: "It includes a horizontally arranged injection table bracket. A first barrel is provided inside the injection table bracket. A first screw is provided inside the first barrel. A first power mechanism is provided at the rear end of the first screw. An injection tube connector is provided at the front end of the injection table bracket. A nozzle is provided at the front end of the injection tube connector. A second barrel is provided on one side surface of the injection tube connector. A second screw is provided inside the second barrel. A second power mechanism is provided at the rear end of the second barrel; the center of the injection tube connector has an injection cavity. The front end of the injection cavity is communicated with the nozzle, the rear end is communicated with the barrel of the first barrel, and the side surface is communicated with the second barrel. This semi-solid magnesium alloy dual-barrel injection system can effectively and quickly increase the large amount of semi-solid magnesium alloy slurry required for products in a short time before equipment injection by setting an injection tube connector and adding the mechanism of the second barrel and the second screw, so as to meet the requirements of large semi-solid magnesium alloy products in the fields of automobiles and communications." However, the problem with the above technology is that the horizontal and vertical barrels are powered by motors, and the generated driving force is insufficient, which easily leads to defects such as low density of the finished product and the presence of holes. Therefore, there is an urgent need for a semi-solid magnesium alloy injection device with pressure boosting injection to solve the above problems. Summary of the Invention

[0003] Aiming at the above technical defects, the present invention provides a semi-solid magnesium alloy injection device with pressure boosting injection to solve the problems raised in the above background art.

[0004] To achieve the above object, the present invention provides the following technical solution: a semi-solid magnesium alloy injection device for pressure injection, characterized in that it includes an injection mechanism, a pressure boosting mechanism and a mold clamping mechanism. The injection mechanism melts the light metal alloy slurry, and the injection mechanism is communicated with the barrel of the pressure boosting mechanism through a channel. The molten light metal alloy slurry is injected into the barrel through the channel. The pressure boosting mechanism further includes a shot rod, and the shot rod is axially movably arranged in the barrel. The shot rod injects the molten light metal alloy slurry into the mold clamping mechanism to form a molded part.

[0005] Preferably, a flange is provided at the end of the injection mechanism, and the flange is fixedly connected to the barrel. A shot rod is provided on one side of the pressure boosting mechanism. A punch is provided at one end of the shot rod, and the punch is slidably nested in the barrel. The injection mechanism includes an injection cylinder body, a screw rotation driving assembly and a stirring screw. A screw injection driving assembly is provided at the top of the injection cylinder body. The screw rotation driving assembly is connected to the end of the injection cylinder body away from the flange. A stirring screw is provided between the injection cylinder body and the flange. The screw rotation driving assembly and the stirring screw are connected by an injection piston.

[0006] Preferably, the screw rotation driving assembly is driven by a servo motor. A third hydraulic valve group is provided at the bottom of the injection cylinder body. The stirring screw is nested in a screw barrel. One end of the screw barrel is fixedly connected to the flange, and the other end is fixedly connected to the injection cylinder body. A light metal granule barrel is provided at the top of the screw barrel. Heating elements are provided between the flange and the inner layer of the screw barrel.

[0007] Preferably, a dispersion stirring head is provided at one end of the stirring screw close to the flange. The dispersion stirring head includes a reinforcement phase dispersion head and a dendritic dispersion head. The reinforcement phase dispersion head is located between the stirring screw and the dendritic dispersion head.

[0008] Preferably, the pressure boosting mechanism includes a shot accumulator, a pressure boosting accumulator and a shot unit. The shot accumulator is communicated with the oil passage of the shot unit. A pressure boosting unit is provided in the oil passage between the pressure boosting accumulator and the shot unit. The pressure boosting unit is provided with a second hydraulic valve group. The shot unit is provided with a first hydraulic valve group. The shot unit is fixedly connected to the end of the shot rod away from the punch.

[0009] Preferably, a mold cavity is provided inside the mold clamping mechanism. The mold cavity is communicated with the barrel. The mold cavity is formed by two templates being closely adjacent to each other.

[0010] Preferably, guide columns are provided between the two templates. The guide columns are fixedly connected to one of the templates and movably connected to the other template.

[0011] Preferably, a propulsion piston is respectively arranged in the injection energy accumulator and the boosting energy accumulator, and the propulsion piston divides the injection energy accumulator and the boosting energy accumulator into two cavities.

[0012] Preferably, a high-pressure gas is stored in the upper cavity of the propulsion piston, and a liquid is stored in the lower cavity of the propulsion piston.

[0013] Compared with the prior art, the beneficial effects of a semi-solid magnesium alloy injection device with boosting injection of the present invention are as follows: The injection process is efficient. Through the screw rotation drive assembly of the injection mechanism, the precise control of the servo motor, and the action of the stirring screw, the uniformity and fluidity of the alloy slurry during the injection process are ensured, realizing efficient injection; Using precision control components such as servo motors and the third hydraulic valve group can provide highly accurate injection force and speed, ensuring the consistency of each injection process and improving product quality; The dispersion stirring head is provided with a reinforcing phase dispersion head and a dendritization dispersion head, which can achieve more uniform mixing of materials and ensure the optimization of the properties of the alloy; Double pressurization of the boosting energy accumulator and the injection energy accumulator, as well as the regulation of the first and second hydraulic valve groups, increases the injection pressure, improves the working efficiency of the system, and ensures the injection performance of the molten light metal alloy slurry. Description of the Drawings

[0014] Figure 1 is a structural schematic diagram of the present invention;

[0015] Figure 2 is a structural schematic diagram of the dispersion stirring head.

[0016] In the figure: 1 - screw injection drive assembly, 2 - injection cylinder block, 3 - injection piston, 4 - screw rotation drive assembly, 5 - light metal granule barrel, 6 - stirring screw, 7 - heating element, 8 - servo motor, 9 - third hydraulic valve group, 10 - screw feed pipe, 11 - dispersion stirring head, 1101 - reinforcing phase dispersion head, 1102 - dendritization dispersion head, 12 - injection energy accumulator, 13 - boosting energy accumulator, 14 - boosting unit, 15 - second hydraulic valve group, 16 - injection unit, 17 - first hydraulic valve group, 18 - injection rod, 19 - punch, 20 - barrel, 21 - mold clamping mechanism, 22 - guide pillar, 23 - template, 24 - cavity, 25 - propulsion piston, 26 - light metal granule, 27 - nitrogen, 28 - hydraulic oil, 29 - alloy slurry, 30 - flange. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to the attached Figure 1-2 , an embodiment provided by the present invention: A semi-solid magnesium alloy injection device for pressure boosting injection, including an injection mechanism, a pressure boosting mechanism and a mold clamping mechanism. The injection mechanism melts the light metal alloy slurry. The injection mechanism is connected to the barrel 20 of the pressure boosting mechanism through a channel. The molten light metal alloy slurry is injected into the barrel 20 through the channel. The pressure boosting mechanism further includes a injection rod 18. The injection rod 18 is axially movably arranged in the barrel 20. The injection rod 18 injects the molten light metal alloy slurry into the mold clamping mechanism to form a workpiece.

[0019] The pressure boosting mechanism is used to provide an additional strong pressure to increase the injection pressure. The die casting machine barrel 20 of the mold clamping mechanism connects the injection mechanism and the pressure boosting mechanism, enabling them to work continuously and cooperatively. The stability of the device is ensured by the fixed connection between the flange 30 and the die casting machine barrel 20, enabling the alloy slurry 29 to continuously flow into the mold clamping mechanism. The punch 19, as a part of the injection rod 18, is slidably nested in the die casting machine barrel 20 and is used to push the alloy slurry 29 into the mold clamping mechanism for injection molding.

[0020] This semi-solid light metal alloy injection device for pressure boosting injection can achieve an efficient and precise injection process, ensuring the quality and performance of the light metal alloy. By optimizing the structure and connection method of the device, the stability and reliability of the device are improved, and at the same time, it has operational flexibility and production efficiency.

[0021] Specifically, a flange 30 is provided at the end of the injection mechanism. The flange 30 is fixedly connected to the barrel 20. A injection rod 18 is provided on one side of the pressure boosting mechanism. One end of the injection rod 18 is provided with a punch 19. The punch 19 is slidably nested in the barrel 20. The injection mechanism includes an injection cylinder body 2, a screw rotation driving assembly 4, and a stirring screw 6. A screw injection driving assembly 1 is provided at the top of the injection cylinder body 2. The screw rotation driving assembly 4 is connected to the end of the injection cylinder body 2 away from the flange 30. A stirring screw 6 is provided between the injection cylinder body 2 and the flange 30. The screw rotation driving assembly 4 and the stirring screw 6 are connected by an injection piston 3.

[0022] By precisely controlling the screw injection drive assembly 1, it is ensured that accurate driving force can be provided in each injection to achieve precise material injection. The flange 30 is connected between the die-casting machine material pipe 20 and the screw material pipe 10 to ensure the sealing performance of the connection. The screw rotation drive assembly 4 is the power source of the injection mechanism, which includes components such as a motor and a reducer to provide sufficient torque.

[0023] The screw rotation drive assembly 4 is driven by a servo motor 8. A third hydraulic valve group 9 is arranged at the bottom of the injection cylinder body 2. The stirring screw 6 is nested in the screw material pipe 10. One end of the screw material pipe 10 is fixedly connected to the flange 30, and the other end is fixedly connected to the injection cylinder body 2. A light metal particle barrel 5 is arranged at the top of the screw material pipe 10. Heating elements 7 are arranged on the inner layer of the flange 30 and the screw material pipe 10.

[0024] The screw rotation drive assembly 4 is powered by a servo motor 8, which provides a reliable power source for the high precision and high efficiency of the injection mechanism. The servo motor 8 has precise speed and position control capabilities, thus ensuring the accuracy and stability of the injection process.

[0025] The third hydraulic valve group 9 at the bottom of the injection cylinder body 2 is used to control the pressure of the injection piston 3 and transmit it to the stirring screw 6, making it easier to cope with different process requirements.

[0026] The stirring screw 6 is nested in the screw material pipe 10. The light metal particles 26 enter the screw material pipe 10 through the light metal particle barrel 5 and are processed by the stirring screw 6. Heating elements 7 are arranged on the inner layer of the flange 30 and the screw material pipe 10, which can maintain the appropriate temperature of the light metal particles 26 during the injection process, ensuring the fluidity and stability of the material. The heating elements 7 can precisely control the temperature of the light metal particle barrel 5.

[0027] A dispersion stirring head 11 is arranged at one end of the stirring screw 6 close to the flange 30. The dispersion stirring head 11 includes a reinforcement phase dispersion head 1101 and a dendritization dispersion head 1102. The reinforcement phase dispersion head 1101 is located between the stirring screw 6 and the dendritization dispersion head 1102.

[0028] The reinforcement phase dispersion head 1101 and the dendritization dispersion head 1102 improve the more uniform mixing of the material during the stirring process to meet the high requirements for the mixing degree and dispersion degree. The reinforcement phase dispersion head 1101 is used to play the role of dispersing the reinforcement phase. The reinforcement phase usually refers to tiny particles dispersed in a continuous phase. The design of this head may include special geometric shapes, stirring structures or materials to enhance the uniform distribution of the reinforcement phase. The dendritization dispersion head 1102 is a kind of structure that changes the structure of the material by introducing dendrites, thereby adjusting its properties and providing the special properties required by the material.

[0029] The pressure boosting mechanism includes an injection accumulator 12, a boosting accumulator 13, and an injection unit 16. The oil passage of the injection accumulator 12 is connected to that of the injection unit 16. A boosting unit 14 is provided in the oil passage between the boosting accumulator 13 and the injection unit 16. The boosting unit 14 is provided with a second hydraulic valve group 15, and the injection unit 16 is provided with a first hydraulic valve group 17. The injection unit 16 is fixedly connected to one end of the injection rod 18 away from the punch 19.

[0030] The main function of the injection accumulator 12 is to store pressure energy so that it can be released when needed. The oil passage of the injection accumulator 12 is connected to that of the injection unit 16 to ensure that the stored pressure can be quickly released into the system when needed. The boosting accumulator 13 has the effect of increasing the injection pressure of the injection accumulator 12. The second hydraulic valve group 15 and the first hydraulic valve group 17 are respectively used to control the reverse flow of the liquid in the boosting unit 14 and the injection unit 16 back to the injection accumulator 12 and the boosting accumulator 13.

[0031] A mold cavity 24 is provided inside the mold clamping mechanism. The mold cavity 24 is connected to the die casting machine's material pipe 20 and is formed by two templates 23 pressing closely against each other. Guide columns 22 are provided between the two templates 23. The guide columns 22 are fixedly connected to one of the templates 23 and movably connected to the other template 23. Piston rods 25 are respectively provided inside the injection accumulator 12 and the boosting accumulator 13. The piston rods 25 divide the injection accumulator 12 and the boosting accumulator 13 into two cavities. The upper cavities above the piston rods 25 store high-pressure gas, and the lower cavities below the piston rods 25 store liquid.

[0032] The channel setting between the mold cavity 24 and the die casting machine's material pipe 20 ensures that the molten light metal alloy slurry can be evenly injected into the mold cavity 24 during the injection process to form a product. The guide columns 22 play a role of positioning and guiding between the two templates 23 to ensure the alignment and tight fit of the templates 23 and prevent the molten light metal alloy slurry from overflowing from the cavity 24.

[0033] The piston rods 25 divide the injection accumulator 12 and the boosting accumulator 13 into two upper and lower cavities. The upper cavities store high-pressure gas. The gas in this embodiment is nitrogen 27, and the lower cavities store liquid. The liquid in this embodiment is hydraulic oil 28. This division and storage design helps to ensure the efficiency and safety of the system, efficiently control the boosting unit 14 and the injection unit 16 to increase the injection pressure of the punch 19, and this layered design can be used to provide different working media to ensure that it can be quickly released and push the injection or boosting process when needed.

[0034] Specific working mode of this embodiment: The light metal particles 26 in this embodiment are specifically semi-solid light metal alloys including aluminum alloys, magnesium alloys, magnesium-lithium alloys, etc. Through the coordinated work of the injection mechanism, pressurization mechanism and mold clamping mechanism, an efficient and precise injection process is achieved. First, pour the light metal particles 26 into the light metal particle barrel 5 of the injection mechanism. Start the servo motor 8 to rotate the screw, drive the component 4 to drive the injection piston 3 to rotate, and then drive the stirring screw 6. During the rotation of the stirring screw 6, the light metal particles 26 fall into the screw pipe 10 and are pushed forward with the stirring screw 6 towards the dispersion stirring head 11. And the heating element 7 continuously heats the light metal particles 26 and gradually transforms them into alloy slurry 29. Therefore, the screw injection drive assembly 1 drives the injection piston 3 to make the stirring screw 6 have the pressure to convey the alloy slurry 29, that is, the semi-solid light metal alloy. As the alloy slurry 29 is further pushed, it enters the die-casting machine pipe 20 through the flange 30. The nitrogen gas 27 filled in the injection energy accumulator 12 and the pressurization energy accumulator 13 pushes the propulsion piston 25, thereby pressurizing the hydraulic oil 28 and then pushing the pressurization unit 14 and the injection unit 16. Since the end of the injection unit 16 is the punch 19, the punch 19 will fill the alloy slurry 29 into the mold along the die-casting machine pipe 20 at a speed of 0.2 - 8 m / s and inject it into the cavity 24 with high-pressure pressure feeding. When the injection is over, the two templates 23 are separated, and the finished product can be obtained.

[0035] This technology has the advantages of high die-casting speed, large filling and pressurization, and semi-solid injection molding pulping technology, integrating high-pressure die-casting and magnesium-aluminum alloy semi-solid injection molding technology. Combining the advantages of screw stirring and refining, dispersing alloy strengthening phases, and shearing and stirring light metal slurries, high-pressure die-casting composite molding, the product has a dense structure and high mechanical properties, and can be subjected to high-temperature heat treatment. Thin-walled complex parts can be formed under the condition of a low solid phase rate of 5% - 30%, and thick-walled structural parts can be formed under the condition of a high solid phase rate of 30% - 60%. The formed parts can be subjected to high-temperature heat treatment to further improve the mechanical properties of the product.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A semi-solid magnesium alloy injection device for pressure boosting injection, characterized in that, It includes an injection mechanism, a boosting mechanism and a mold clamping mechanism. The injection mechanism melts the light metal alloy slurry. The injection mechanism is communicated with the barrel (20) of the boosting mechanism through a channel. The molten light metal alloy slurry is injected into the barrel (20) through the channel. The boosting mechanism further includes a plunger rod (18). The plunger rod (18) is axially movably arranged in the barrel (20). The plunger rod (18) injects the molten light metal alloy slurry into the mold clamping mechanism to form a workpiece.

2. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 1, wherein, A flange (30) is arranged at the end of the injection mechanism. The flange (30) is fixedly connected with the barrel (20). A plunger rod (18) is arranged on one side of the boosting mechanism. A punch (19) is arranged at one end of the plunger rod (18). The punch (19) is slidably nested in the barrel (20). The injection mechanism includes an injection cylinder block (2), a screw rotation drive assembly (4), and a stirring screw (6). A screw injection drive assembly (1) is arranged at the top of the injection cylinder block (2). The screw rotation drive assembly (4) is connected to the end of the injection cylinder block (2) far away from the flange (30). A stirring screw (6) is arranged between the injection cylinder block (2) and the flange (30). The screw rotation drive assembly (4) is connected to the stirring screw (6) through an injection piston (3).

3. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 2, characterized in that, The screw rotation drive assembly (4) is driven by a servo motor (8). A third hydraulic valve group (9) is arranged at the bottom of the injection cylinder block (2). The stirring screw (6) is nested in a screw barrel (10). One end of the screw barrel (10) is fixedly connected to the flange (30), and the other end is fixedly connected to the injection cylinder block (2). A light metal granule barrel (5) is arranged at the top of the screw barrel (10). Heating elements (7) are arranged between the flange (30) and the inner layer of the screw barrel (10).

4. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 3, wherein, A dispersion stirring head (11) is arranged at the end of the stirring screw (6) close to the flange (30). The dispersion stirring head (11) includes a reinforcement phase dispersion head (1101) and a dendritic dispersion head (1102). The reinforcement phase dispersion head (1101) is located between the stirring screw (6) and the dendritic dispersion head (1102).

5. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 2, wherein, The boosting mechanism includes a shot accumulator (12), a boosting accumulator (13), and a shot unit (16). The shot accumulator (12) is communicated with the oil passage of the shot unit (16). A boosting unit (14) is arranged in the oil passage between the boosting accumulator (13) and the shot unit (16). A second hydraulic valve group (15) is arranged on the boosting unit (14). A first hydraulic valve group (17) is arranged on the shot unit (16). The shot unit (16) is fixedly connected to the end of the plunger rod (18) far away from the punch (19).

6. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 1, characterized in that, A mold cavity (24) is arranged inside the mold clamping mechanism. The mold cavity (24) is communicated with the barrel (20). The mold cavity (24) is formed by two templates (23) pressing against each other.

7. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 6, wherein, A guide post (22) is arranged between two of the templates (23). The guide post (22) is fixedly connected to one of the templates (23) and movably connected to the other template (23).

8. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 5, characterized in that, A propulsion piston (25) is respectively arranged in the injection energy accumulator (12) and the boosting energy accumulator (13). The propulsion piston (25) divides the injection energy accumulator (12) and the boosting energy accumulator (13) into two cavities.

9. The semi-solid magnesium alloy injection device for pressure boosting injection according to claim 8, wherein, The upper cavity of the propulsion piston (25) stores high-pressure gas, and the lower cavity of the propulsion piston (25) stores liquid.

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