Automobile vacuum pump shell manufacturing device and method

Abstract

The invention relates to the technical field of automobile part preparation, in particular to an automobile vacuum pump shell manufacturing device and method.The automobile vacuum pump shell manufacturing device comprises an upper die-casting die, the upper die-casting die is provided with a feeding port and a first die-casting cavity, and an upper forming die is installed in the first die-casting cavity; the die-casting lower die is provided with a second die-casting cavity, a forming lower die matched with the forming upper die is installed in the second die-casting cavity, a mold core is installed between the forming upper die and the forming lower die, and the feeding port extends to the position between the forming upper die and the forming lower die; and the sliding pressing assembly is installed between the upper die-casting die and the lower die-casting die, and when the upper die-casting die and the lower die-casting die get close to each other or get away from each other, the sliding pressing assembly slides along the lower die-casting die so as to press or loosen the upper forming die and the lower forming die.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts manufacturing, and in particular to an automotive vacuum pump housing manufacturing device and method. Background Art

[0002] The main function of a vacuum pump in an automobile is to provide vacuum assistance for the braking system, thereby improving braking performance and driving safety.

[0003] In an automotive braking system, the vacuum pump generates a vacuum, enabling the brake booster to utilize the pressure difference between atmospheric pressure and the vacuum to amplify the force applied by the driver on the brake pedal. This boosting mechanism can significantly reduce the force required for the driver to step on the brake pedal and shorten the braking distance. Meanwhile, the vacuum pump is also used in automotive fuel supply. Since the vacuum pump can continuously and stably provide vacuum pressure to ensure the normal operation of the brake booster, even in high-altitude areas or under high engine loads, the vacuum pump can ensure sufficient assistance for the braking system, thus being widely used in automobiles. In the prior art, since most vacuum pump housings are of thin-walled structures, the manufacturing of tooling for each process is difficult, and the processes are cumbersome and complex, resulting in low manufacturing efficiency of the vacuum pump housing.

[0004] Therefore, those skilled in the art are committed to developing an automotive vacuum pump housing manufacturing device and method to facilitate rapid improvement of the vacuum pump manufacturing efficiency and manufacturing quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an automotive vacuum pump housing manufacturing device and method to facilitate rapid improvement of the vacuum pump manufacturing efficiency and manufacturing quality.

[0006] The technical solution of the present invention for solving the above technical problem is as follows: An automotive vacuum pump housing manufacturing device, characterized in that it includes A die-casting upper mold, the die-casting upper mold has a feed port, and the die-casting upper mold has a first die-casting cavity, and a forming upper mold is installed in the first die-casting cavity; A die-casting lower mold, the die-casting lower mold has a second die-casting cavity, and a forming lower mold cooperating with the forming upper mold is installed in the second die-casting cavity. A core is installed between the forming upper mold and the forming lower mold, and the feed port extends to between the forming upper mold and the forming lower mold; A sliding pressing component, the sliding pressing component is installed between the die-casting upper mold and the die-casting lower mold. When the die-casting upper mold and the die-casting lower mold approach or move away from each other, the sliding pressing component slides along the die-casting lower mold to press or release the forming upper mold and the forming lower mold.

[0007] The beneficial effects of adopting the above solution are as follows: The upper forming die and the lower forming die are respectively installed in the upper die-casting die and the lower die-casting die, and a core is arranged between the two, which can accurately control the shape and size of the vacuum pump housing, making the wall thickness of the housing more uniform, reducing the defects caused by uneven material distribution, and thus significantly improving the manufacturing precision and quality of the vacuum pump housing; The sliding pressing assembly installed between the upper die-casting die and the lower die-casting die enables the upper die-casting die and the lower die-casting die to fit tightly during the die-closing process and maintain a stable pressing force during the die-casting process, effectively avoiding the loosening or deformation of the die under high-temperature and high-pressure conditions, ensuring the stability of the die-casting process, and further improving the qualified rate of products.

[0008] On the basis of the above technical solution, the present invention can be further improved as follows.

[0009] Further, a plurality of uniformly distributed sliding pressing assemblies are arranged on the outer peripheries of the upper forming die and the lower forming die. The sliding pressing assembly includes a guide rail, a sliding block, and a guide rod. The guide rail is installed on the lower die-casting die, the sliding block is installed between the two guide rails, the guide rod is connected to the sliding block, the guide rod is inclined, and a guide hole cooperating with the guide rod is arranged on the upper die-casting die.

[0010] The beneficial effects of adopting the above further solution are as follows: The cooperation of the guide rail, the sliding block, and the inclined guide rod enables the upper die-casting die and the lower die-casting die to slide smoothly along a predetermined track during the die-closing and die-opening processes, which is beneficial to firmly clamping the upper die-casting die and the lower die-casting die, reducing the intervention of manual operation, and reducing the safety risks caused by human errors.

[0011] Further, a limiting block for limiting and fixing the upper forming die is installed on the lower die-casting die; A guide rod is also installed on the lower die-casting die, the guide rod is vertically arranged, and a guide hole cooperating with the guide rod is arranged on the upper die-casting die.

[0012] The beneficial effects of adopting the above further solution are as follows: Installing a limiting block on the lower die-casting die can effectively limit the position of the upper forming die, prevent it from displacing or shaking during the die-casting process, thereby improving the stability of the die and the reliability of the die-casting process; The matching design of the guide rod and the guide hole provides accurate guidance for the die-closing of the upper die-casting die and the lower die-casting die, ensuring that the same precision can be achieved each time of die-closing, reducing the product defects caused by inaccurate die-closing, and improving the qualified rate of products.

[0013] A manufacturing method for an automotive vacuum pump housing, which is applied to the above-mentioned manufacturing device for an automotive vacuum pump housing, includes the following steps: S100. Heat the aluminum raw material until it melts. S200. First, add a drossing agent to the molten aluminum in step S100, then insert the working end of the rotary degassing machine into the molten aluminum, continuously stir and introduce an inert gas, and simultaneously add a refining agent to the molten aluminum. S300. After preheating the die-casting upper mold and the die-casting lower mold, apply a release agent to the surfaces of the forming upper mold, the forming lower mold, and the core, and then close the mold. S400. Pour the purified aluminum melt in step S200 into the closed mold in step S300. S500. After the aluminum melt cools, take out the cast blank and perform shot peening treatment.

[0014] The beneficial effects of adopting the above further scheme are as follows: After heating and melting the aluminum raw material, first add a drossing agent to remove impurities, and then pass an inert gas through the rotary degassing machine and add a refining agent, which can effectively remove impurities and gases in the molten aluminum, improve the purity of the raw material, and thus enhance the mechanical properties and corrosion resistance of the vacuum pump housing. Preheating the die-casting upper mold and the die-casting lower mold and applying a release agent to the mold surface can reduce the adhesion between the molten aluminum and the mold, lower the demolding difficulty, and improve the surface quality and demolding efficiency of the product.

[0015] Further, in step S100, the aluminum raw material is heated to 720°C to 750°C until it completely melts and is held for 30 min to 60 min.

[0016] The beneficial effects of adopting the above further scheme are as follows: Heating the aluminum raw material to 720°C to 750°C and holding it for 30 min to 60 min can ensure that the aluminum raw material completely melts and reaches an appropriate pouring temperature, avoiding incomplete pouring caused by insufficient temperature or a decrease in material properties caused by excessive temperature.

[0017] Further, in step S200, the drossing agent consists of Na 2 SiF 6 with a mass percentage of 40% - 60%, NaCl with a mass percentage of 20% - 30%, and C powder with a mass percentage of 10% - 20%. The particle size is controlled within 80 mesh to 120 mesh, and the mass ratio of the added drossing agent is 0.1% - 0.15%. The refining agent consists of NaCl, KCl, and Na 3 AlF 6 with a mass ratio of 3:2:1, and the mass ratio of the added refining agent is 0.2% - 0.3%.

[0018] The beneficial effects of adopting the above further solution are as follows: By using a slag remover and a refining agent with a specific ratio, oxides, inclusions, and gases in the molten aluminum can be effectively removed, improving the purity of the molten aluminum, thereby reducing defects such as pores and inclusions in the casting, and enhancing the mechanical properties and corrosion resistance of the product.

[0019] Further, in step S200, when adding the refining agent, the rotational speed of the working end of the hydrogen removal machine is 450 rpm to 550 rpm. After the addition of the refining agent is completed, the rotational speed of the working end of the hydrogen removal machine is 250 rpm to 350 rpm, and the hydrogen removal time is continued for 5 min to 7 min.

[0020] The beneficial effects of adopting the above further solution are as follows: When adding the refining agent, by controlling the rotational speed and hydrogen removal time of the hydrogen removal machine, it can ensure that hydrogen in the molten aluminum is fully discharged, reduce pore defects, and improve the density and mechanical properties of the casting.

[0021] Further, in step S500, the shot peening frequency is 45 ± 5 Hz, and the shot peening time is 10 min to 15 min. The beneficial effects of adopting the above further solution are as follows: By controlling the shot peening frequency and time, it can ensure that impurities and oxide skins on the surface of the casting blank are completely removed, and at the same time avoid surface damage caused by excessive shot peening, improving the surface quality and appearance of the product. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the manufacturing device for the automotive vacuum pump housing in the first embodiment of the present invention; Figure 2 It is a schematic structural diagram of the sliding pressing assembly in the first embodiment of the present invention; Figure 3 It is a schematic structural diagram of the die-casting lower mold in the first embodiment of the present invention; Figure 4 It is a schematic structural diagram of the rotary hydrogen removal device in the fourth embodiment of the present invention.

[0023] In the drawings, the list of components represented by each reference numeral is as follows: 1. Die-casting upper mold; 2. Feeding port; 3. Forming upper mold; 4. Die-casting lower mold; 5. Forming lower mold; 6. Core; 7. Sliding pressing assembly; 8. Guide rail; 9. Sliding block; 10. Guide rod; 11. Limiting block; 12. Guide rod; 13. Graphite rod; 14. Stirring rod; 15. Pneumatic rotary joint; 16. Support plate; 17. Rotating motor; 18. Box body; 19. Guide rod; 20. Frame; 21. Installation plate; 22. Screw bearing; 23. Servo motor; 24. Screw; 25. Guide block. Detailed Embodiments

[0024] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment

[0028] As Figure 1 、 Figure 2 and Figure 3 shown, a manufacturing device for an automotive vacuum pump housing includes a die-casting upper mold 1, the die-casting upper mold 1 has a feed port 2 for pouring molten aluminum, and the die-casting upper mold 1 has a first die-casting cavity, and a forming upper mold 3 is installed in the first die-casting cavity; a die-casting lower mold 4, the die-casting lower mold 4 has a second die-casting cavity, and a forming lower mold 5 that cooperates with the forming upper mold 3 is installed in the second die-casting cavity. A core 6 is installed between the forming upper mold 3 and the forming lower mold 5. The core 6 cooperates with the forming upper mold 3 and the forming lower mold 5 to form a thin-walled housing, and the feed port 2 extends between the forming upper mold 3 and the forming lower mold 5, so as to accurately inject the molten metal and avoid the problem of uneven cooling caused by too long a runner.

[0029] a sliding pressing assembly 7, the sliding pressing assembly 7 is installed between the die-casting upper mold 1 and the die-casting lower mold 4. When the die-casting upper mold 1 and the die-casting lower mold 4 approach or move away from each other, the sliding pressing assembly 7 slides along the die-casting lower mold 4 to press or release the forming upper mold 3 and the forming lower mold 5.

[0030] As Figure 2 、 Figure 3 shown, in some embodiments, a plurality of uniformly distributed sliding pressing components 7 are provided on the outer peripheries of the upper forming die 3 and the lower forming die 5. The plurality of sliding pressing components 7 clamp and stabilize the upper forming die 3 and the lower forming die 5 from different directions. At the same time, multiple sets of symmetrically distributed sliding pressing components 7 can eliminate local stress concentration and prevent the die from deforming. Specifically, the sliding pressing component 7 includes a guide rail 8, a sliding block 9, and a guide rod 10. The guide rail 8 is installed on the lower die-casting die 4. A sliding block 9 is installed between two guide rails 8. A guide rod 10 is connected to the sliding block 9. The guide rod 10 is inclined. A guide hole cooperating with the guide rod 10 is provided on the upper die-casting die 1. When the die is closed, the upper die-casting die 1 presses down to drive the guide rod 10 to slide along an inclined path, and the vertical die-closing force is converted into a radial pressing force through the lever principle, which uniformly acts on the outer periphery of the forming die. At the same time, the inclined guide makes the pressing force gradually increase with the die-closing stroke, ensuring the close fit between the forming die and the core 6 and reducing the generation of flash.

[0031] In the embodiment, a limit block 11 for limiting and fixing the upper forming die 3 is installed on the lower die-casting die 4. A guide rod 12 is also installed on the lower die-casting die 4. The guide rod 12 is vertically arranged. A guide hole cooperating with the guide rod 12 is provided on the upper die-casting die 1. Embodiment 1

[0032] A manufacturing method for an automotive vacuum pump housing, which is applied to the above-mentioned automotive vacuum pump housing manufacturing device, includes the following steps: S100. Heat and melt the aluminum raw material. Specifically, the aluminum raw material is heated to 720°C to 750°C to be completely melted and kept warm for 30 min to 60 min. During the heating process, the temperature needs to be strictly controlled to avoid aluminum water oxidation caused by too high temperature or incomplete melting caused by too low temperature. After the aluminum water is completely melted, keep this temperature and keep warm for 30 min to 60 min to ensure that the temperature of the aluminum water is uniform and consistent, providing stable conditions for the subsequent impurity removal and refining steps.

[0033] S200. First, add a slag removal agent to the melted aluminum water in step S100, then insert the working end of the rotary hydrogen removal machine into the aluminum water, continuously stir and introduce an inert gas, and simultaneously add a refining agent to the aluminum water; Specifically, the slag removal agent is composed of 40%-60% Na 2 SiF 6 , 20%-30% NaCl, and 10%-20% C powder, with the particle size controlled within 80 mesh to 120 mesh, and the mass ratio of the added slag removal agent being 0.1%-0.15%. The slag removal agent can effectively adsorb oxides and inclusions in the aluminum water, form a slag layer and float on the surface of the aluminum water, facilitating subsequent removal.

[0034] The refining agent consists of NaCl, KCl, and Na with a mass ratio of 3:2:1 3 AlF 6 and the mass proportion of the refining agent added is 0.2% - 0.3%.

[0035] When adding the refining agent, insert the working end of the rotary hydrogen removal machine into the molten aluminum, continuously stir and introduce an inert gas (such as argon or nitrogen) to remove hydrogen and other gas impurities in the molten aluminum. The addition of the refining agent can further purify the molten aluminum, remove trace impurities therein, and improve the purity of the molten aluminum. The rotational speed of the working end of the rotary hydrogen removal machine is 450 rpm to 550 rpm to ensure the uniform distribution and full reaction of the refining agent. After the addition of the refining agent, the rotational speed of the working end of the rotary hydrogen removal machine is 250 rpm to 350 rpm, and the hydrogen removal time is 5 min to 7 min to ensure the full discharge of gases in the molten aluminum and reduce the generation of defects such as pores.

[0036] S300. After preheating the die-casting upper mold 1 and the die-casting lower mold 4 (usually at 200°C to 300°C), the preheated mold can reduce the cooling rate of the molten aluminum during pouring, avoiding casting defects caused by excessive temperature difference. Then, after coating the release agent on the surfaces of the forming upper mold 3, the forming lower mold 5, and the core 6, close the mold. The release agent can reduce the adhesion force between the molten aluminum and the mold, facilitate subsequent demolding operations, and improve the surface quality of the product.

[0037] S400. Pour the impurity-removed molten aluminum in step S200 into the closed mold in step S300. Specifically, pour the molten aluminum that has been purified and refined in step S200 from the feed port 2 into the closed mold. During the pouring process, it is necessary to control the pouring speed to ensure that the molten aluminum can fill the mold cavity smoothly and evenly, avoiding problems such as pores or insufficient pouring caused by too fast pouring speed. After pouring, keep the mold in the closed state to allow the molten aluminum to cool and solidify in the mold.

[0038] S500. After the molten aluminum cools, take out the cast blank and perform shot peening. Specifically, the shot peening frequency is 45 ± 5 Hz, and the shot peening time is 10 min to 15 min. Specifically, after the molten aluminum cools and solidifies, open the die-casting upper mold 1 and the die-casting lower mold 4, and take out the cast blank from the mold. The surface of the taken-out blank may be attached with scale or other impurities, so shot peening treatment is required. The specific parameters of the shot peening treatment are: the shot peening frequency is controlled at 45 ± 5 Hz, and the shot peening time is controlled at 10 min to 15 min. Through shot peening treatment, the impurities on the surface of the blank can be removed, the surface cleanliness and roughness can be improved, providing a good foundation for subsequent processing or painting processes. Example Two

[0039] The difference between Example 3 and Example 2 is only that an ultrasonic generator is also installed between the die-casting upper mold 1 and the die-casting lower mold 4, and the output end of the ultrasonic generator abuts against the forming upper mold 3 and the forming lower mold 5. During the gradual cooling process of the molten aluminum, the ultrasonic generator is used to send ultrasonic waves to the molten aluminum. When the ultrasonic waves propagate in the molten aluminum, the acoustic streaming effect will generate strong local shock waves and microjets, which can destroy the dendritic structure, impact the solidification front, increase the stirring and diffusion of the melt, so that the grain size is significantly refined, forming a more uniform equiaxed crystal structure. Moreover, the acoustic streaming effect of the ultrasonic waves can promote the convective heat transfer of the molten aluminum, accelerate the heat transfer from the inside of the melt to the mold surface. At the same time, the ultrasonic waves can homogenize the temperature distribution of the molten aluminum, avoid local undercooling or overheating, thus shortening the solidification time of the molten aluminum and improving the production efficiency. Furthermore, through grain refinement and defect reduction, the ultrasonic treatment can significantly improve the mechanical properties of aluminum castings. The fine grain structure has a larger grain boundary area, which can effectively hinder the movement of dislocations and grain boundary slip, significantly improving the tensile strength, yield strength and elongation of the casting, and at the same time the hardness is also improved. Finally, the vibration effect of the ultrasonic waves can relieve the stress concentration during the cooling process of the molten aluminum, reduce the formation of thermal cracks, and significantly reduce the crack defects on the surface and inside of the shell casting, improving the dimensional accuracy and surface quality. Example

[0040] In this embodiment, a rotary degassing device is also provided, which is used to remove the impurity gas in the molten aluminum in step S200, thereby improving the purity of the molten aluminum and laying a good foundation for the subsequent processing technology. The rotary degassing device includes a graphite rod 13. An air passage is provided in the middle of the graphite rod 13, so that gas can smoothly transmit inside the graphite rod 13, providing a necessary passage for the subsequent degassing operation. At the bottom of the graphite rod 13, a plurality of stirring rods 14 are installed. The stirring rods 14 are arranged in a circle, with one end firmly connected to the graphite rod 13 to ensure stable power transmission to stir the molten aluminum during operation, and the other end extends outward, expanding the stirring range, so that the molten aluminum can be stirred more fully, which is beneficial to the escape of impurity gas.

[0041] The stirring rod 14 is provided with air holes, and these air holes are arranged downward and communicate with the air passage. The downwardly arranged air holes have significant advantages. It can effectively reduce the blockage phenomenon during the gas discharge process, ensure that the impurity gas can be smoothly separated from the molten aluminum, and greatly improve the efficiency and effect of degassing.

[0042] A pneumatic rotary joint 15 is installed on the graphite rod 13. The pneumatic rotary joint 15 is connected to the air duct through an air pipe, so that inert gas can be continuously transported from the outside into the air duct inside the graphite rod 13. At the same time, the graphite rod 13 is firmly installed on the support plate 16 by installing bearings. This installation method not only ensures the stability of the graphite rod 13, but also enables it to maintain good balance during rotation. A rotating motor 17 is also installed on the support plate 16. The output end of the rotating motor 17 is connected to the graphite rod 13. Through the operation of the motor, the graphite rod 13 can be driven to rotate at a high speed, and then the stirring rod 14 will also rotate accordingly, fully stirring the molten aluminum to promote the release of impurity gases.

[0043] A box body 18 is also installed on the support plate 16. A guide rod 19 is installed on one side of the box body 18. An installation plate 21 is installed on the frame 20. The installation plate 21 is vertically arranged, and a guide block 25 matching with the guide rod 19 is installed on it, so that the whole device can maintain good guiding performance during operation, ensure the relative positions of all components are accurate, and thus ensure the stable operation of the hydrogen removal device.

[0044] In addition, a plurality of lead screw bearings 22 are installed on the other side of the box body 18, and a servo motor 23 is installed on the frame 20. The output end of the servo motor 23 is connected with a lead screw 24, and the lead screw 24 passes through the plurality of lead screw bearings 22. When the servo motor 23 rotates, it will drive the lead screw 24 to rotate together, and then through the cooperation of the lead screw 24 and the lead screw bearings 22, the support plate 16 and the graphite rod 13 can move up and down along the guide rod 19, so that the rotary hydrogen removal device can operate at different working heights, flexibly adjust the position of the device according to the actual production requirements, further improve the applicability and flexibility of the device, and enable it to better adapt to various complex production environments and process requirements.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A manufacturing device for automobile vacuum pump housing, characterized in that: include A die-casting upper mold (1), the die-casting upper mold (1) having a feed port (2), and the die-casting upper mold (1) having a first die-casting cavity, wherein a forming upper mold (3) is installed in the first die-casting cavity; A die-casting lower die (4), the die-casting lower die (4) having a second die-casting cavity, a molding lower die (5) matched with the molding upper die (3) being installed in the second die-casting cavity, a core (6) being installed between the molding upper die (3) and the molding lower die (5), and the feed port (2) extending between the molding upper die (3) and the molding lower die (5); A sliding clamping assembly (7), wherein the sliding clamping assembly (7) is installed between the die-casting upper mold (1) and the die-casting lower mold (4); when the die-casting upper mold (1) and the die-casting lower mold (4) move closer to or farther away from each other, the sliding clamping assembly (7) slides along the die-casting lower mold (4) to clamp or loosen the molding upper mold (3) and the molding lower mold (5).

2. The automobile vacuum pump housing manufacturing device according to claim 1, characterized in that: The outer periphery of the molding upper mold (3) and the molding lower mold (5) is provided with a plurality of uniformly distributed sliding clamping assemblies (7), the sliding clamping assemblies (7) comprising guide rails (8), sliding blocks (9) and guide rods (10), the guide rails (8) being installed on the die-casting lower mold (4), the sliding blocks (9) being installed between the two guide rails (8), the guide rods (10) being connected to the sliding blocks (9), the guide rods (10) being arranged at an angle, and the die-casting upper mold (1) is provided with guide holes cooperating with the guide rods (10).

3. The automobile vacuum pump housing manufacturing device according to claim 1, characterized in that: A limiting block (11) for limiting and fixing the upper molding die (3) is installed on the die-casting lower die (4); A guide rod (12) is also installed on the die-casting lower mold (4), and the guide rod (12) is arranged vertically. The die-casting upper mold (1) is provided with a guide hole that cooperates with the guide rod (12).

4. A method for manufacturing a car vacuum pump housing, applied to the car vacuum pump housing manufacturing device according to any one of claims 1 to 3, characterized in that: The following steps are involved: S100. heating and melting the aluminum raw material; S200. After adding a slag remover to the molten aluminum in step S100, insert the working end of the rotary dehydrogenator into the molten aluminum, continue stirring, introduce inert gas, and simultaneously add a refining agent to the molten aluminum; S300. After the die-casting upper mold (1) and the die-casting lower mold (4) are preheated, a release agent is applied to the surface of the molding upper mold (3), the molding lower mold (5) and the core (6), and then the molds are closed; S400. pouring the molten aluminum after the impurities are removed in step S200 into the mold in step S300; S500. After the aluminum liquid cools down, the cast blank is taken out and shot blasted.

5. The method for manufacturing a vehicle vacuum pump housing according to claim 4, characterized in that: In step S100, the aluminum raw material is heated to 720°C to 750°C to be completely melted, and the temperature is kept for 30 minutes to 60 minutes.

6. The method for manufacturing a vehicle vacuum pump housing according to claim 4, characterized in that: In step S200, the slag remover is composed of 40%-60% Na2SiF6, 20%-30% NaCl, and 10%-20% C powder in mass percentage, the particle size is controlled at 80 mesh to 120 mesh, and the mass proportion of the slag remover added is 0.1%-0.15%. The refining agent is composed of NaCl, KCL and Na3AlF6 in a mass ratio of 3:2:1, and the mass proportion of the refining agent added is 0.2%-0.3%.

7. The method for manufacturing a vehicle vacuum pump housing according to claim 4, characterized in that: In step S200, when the refining agent is added, the speed of the working end of the rotating dehydrogenator is 450 rpm to 550 rpm. After the refining agent is added, the speed of the working end of the rotating dehydrogenator is 250 rpm to 350 rpm, and the dehydrogenation time is continued for 5 min to 7 min.

8. The method for manufacturing a vehicle vacuum pump housing according to claim 4, characterized in that: In step S500, the shot blasting frequency is 45±5 Hz, and the shot blasting time is 10 min to 15 min.

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