Low-pressure casting mold for valve rocker

Abstract

The utility model provides a low-pressure casting die of a valve rocker arm, which comprises an insert, an upper die insert and a lower die insert, and the upper die insert and the lower die insert are matched with each other to form a plurality of die cavities; a plurality of sprues are annularly arranged on the periphery of the shunting ladle; the sprue bush is communicated with the inner space of the flow dividing bag, so that the molten metal is conveyed to the flow dividing bag from the sprue bush and fills the mold cavity; wherein the mold cavities are uniformly distributed on the periphery of the shunting bag. The shunting bag is communicated with the internal space of the sprue bush, so that molten metal is conveyed to the shunting bag from the sprue bush and is injected into the mold cavity, and small parts such as the valve rocker can be cast. According to the low-pressure casting mold, molten metal is led into the mold cavity from the flow dividing bag under relatively low pressure in a low-pressure pouring mode, so that formation of air holes and shrinkage cavities is reduced, and the low-pressure casting mold is suitable for manufacturing parts in complex shapes.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile component casting, in particular to a low-pressure casting mold for a valve rocker arm. Background Art

[0002] As the trend toward lightweight automobiles deepens, an increasing number of automotive metal parts are being converted from steel to aluminum alloy. This is particularly true for a large number of small parts, for which the development of casting molds is ongoing to improve production efficiency and reduce costs. Aluminum alloy low-pressure casting, due to its numerous advantages, is becoming increasingly popular. Currently, relatively mature processes exist for low-pressure casting of aluminum alloy automotive wheels, aluminum alloy cylinder blocks and heads for automotive engines, intake manifolds, and flywheel housings. Low-pressure casting of small castings is also widely used in production practice.

[0003] Although the casting molds in the prior art can cast well-shaped workpieces, there are problems such as low process yield, low production efficiency and high production cost. In addition, there are often obvious defects in filling and solidification feeding. Utility Model Content

[0004] The utility model aims to solve the above technical problems by connecting a built-in diverter bag at the injection port of the mold cavity to ensure that the molten metal fills the mold cavity when the diverter bag is depressurized, so that the obtained workpiece has better quality and a higher process yield.

[0005] To achieve the above-mentioned purpose, the utility model provides a low-pressure casting mold for a valve rocker arm, the low-pressure casting mold comprising: an insert, the insert comprising an upper mold insert and a lower mold insert, the upper mold insert and the lower mold insert cooperate with each other to form a plurality of mold cavities; a diverter bag, a plurality of gates are arranged around the diverter bag; a gate sleeve, the gate sleeve is connected to the internal space of the diverter bag to deliver the molten metal from the gate sleeve to the diverter bag and fill the mold cavity; wherein the mold cavities are evenly distributed around the periphery of the diverter bag.

[0006] The utility model provides a low-pressure casting mold for manufacturing valve rocker arms. By connecting the diverter bag with the internal space of the gate sleeve, molten metal is transported from the gate sleeve to the diverter bag and injected into the mold cavity, thereby casting a small part such as a valve rocker arm. Among them, the upper mold insert and the lower mold insert cooperate with each other to form a plurality of mold cavities for manufacturing the valve rocker arm, so as to ensure that the mold remains stable during the casting process to obtain a high-quality product; a plurality of gates are arranged around the diverter bag for injecting molten metal into the mold cavity. Well-designed gates can ensure that the molten metal uniformly fills the mold cavity, reducing the generation of defects and bubbles; the diverter bag is connected to the internal space of the gate sleeve, for transporting molten metal from the gate sleeve to the diverter bag and filling the mold cavity. This diverter system helps to control the flow of molten metal, thereby improving the quality and consistency of the product; the mold cavities are evenly distributed around the periphery of the diverter bag, which enables multiple mold cavities to be set up simultaneously for production, improving production efficiency and reducing production costs.

[0007] Low-pressure casting molds use low-pressure pouring to introduce molten metal from a manifold into the mold cavity at relatively low pressure, reducing the formation of pores and shrinkage holes. This makes them suitable for manufacturing parts with complex shapes. Low-pressure casting molds can improve production efficiency, reduce material waste, and enhance product quality and stability, thereby reducing manufacturing costs and enhancing product competitiveness.

[0008] In any of the above technical solutions, each mold cavity is connected to a corresponding gate.

[0009] By assigning a gate to each mold cavity, each space in the mold dedicated to the part being cast has a dedicated gate for molten metal. This design ensures that each mold cavity is fully and evenly filled, minimizing the risk of bubbles and defects. Providing each mold cavity with an independent gate allows for greater control over the flow of molten metal, thereby improving product quality and consistency.

[0010] In any of the above technical solutions, an annular runner is provided inside the diversion package, and the annular runner surrounds and defines a cavity structure.

[0011] An annular runner is designed inside the diverter bag, forming a cavity structure around the gate sleeve. After depressurization, the diverter bag is vented, and the molten metal inside will flow into every corner of the mold cavity. This facilitates filling the mold cavity with molten metal. At the same time, the formation of the cavity structure can better control the flow and distribution of the molten metal, thereby ensuring the quality and consistency of the valve rocker arm casting. This low-pressure casting mold has no obvious defects in filling, solidification and shrinkage. The built-in diverter bag can effectively feed the casting to obtain a good casting. By optimizing the internal structure of the diverter bag, this technical solution further improves the performance and production efficiency of the low-pressure casting mold, providing reliable process support for the manufacture of high-quality valve rocker arms.

[0012] In any of the above technical solutions, the low-pressure casting mold also includes: a mold frame, the mold frame includes an upper mold frame and a lower mold frame, and the upper mold frame is arranged on one side of the upper mold insert to adjust the tightness between the upper mold insert and the lower mold insert.

[0013] By positioning the upper mold frame on one side of the upper mold insert and the lower mold frame on the other side, the interaction between the upper and lower mold frames allows for adjustment of the mold assembly to ensure optimal clearance or tightness between the upper and lower mold inserts. Adjusting the mold frames allows for flexible control of mold assembly to accommodate castings of varying sizes and shapes. This technical solution makes the mold more flexible and adjustable during production, improving production efficiency and product quality while reducing production costs.

[0014] In any of the above technical solutions, the lower mold frame is provided with a pouring basin, which is communicated with the interior of the diversion package.

[0015] By providing a pouring basin in the lower mold frame and ensuring internal connectivity between the diverter ladle and the pouring basin, a more uniform and stable distribution of molten metal can be achieved, reducing the generation of gas and inclusions, thereby improving the quality of the casting and molding efficiency. This design also helps reduce oxidation and leakage of the molten metal during the pouring process, further ensuring the consistency and stability of the casting. Therefore, the design of the pouring basin helps improve the efficiency and reliability of the casting process, while reducing the scrap rate and improving production efficiency. Among them, two gate sleeves are connected above the pouring basin to ensure that the two diverter ladle are emptied and the workpiece is cast at the same time, improving production efficiency and saving production costs.

[0016] In any of the above technical solutions, a heating plate is provided between the diversion ladle and the sprue sleeve, and the heating plate is provided with perforations for the passage of molten metal.

[0017] By placing a heating plate between the manifold and the sprue bushing, and with perforations for the passage of molten metal, the temperature control and stability of the molten metal during the low-pressure casting process are improved. By placing the heating plate between the manifold and the sprue bushing, the molten metal is effectively heated, ensuring ideal fluidity and castability during the casting process. The perforations on the heating plate allow the molten metal to flow smoothly, while the heating effect of the heating plate reduces the risk of solidification, thereby reducing the possibility of defects in the production process. Therefore, this design helps to improve the molding quality of castings, reduce scrap rates during production, and improve production efficiency and cost-effectiveness.

[0018] In any of the above technical solutions, a plurality of heating tubes are provided inside the heating plate.

[0019] By installing several heating tubes within the heating plate, the temperature control and stability of the molten metal during the low-pressure casting process can be further improved. The installation of multiple heating tubes within the heating plate enables more uniform and precise heating of the heating plate. These heating tubes can adjust the temperature of the heating plate by controlling the current or heat, ensuring that the molten metal maintains an appropriate temperature throughout its flow. This precise temperature control helps reduce the solidification time of the molten metal and ensures that the molten metal maintains ideal fluidity and castability when filling the mold. As a result, this design further improves the molding quality of the castings, reduces the scrap rate during production, and improves production efficiency and cost-effectiveness.

[0020] In any of the above technical solutions, the maximum outline size of the valve rocker arm is 108mm×53mm×34mm.

[0021] By controlling the maximum outline dimensions of the valve rocker arm within an appropriate range, it can be adapted to specific engine structures and performance requirements. As a critical engine component, the valve rocker arm's dimensions are crucial to engine performance and reliability. By specifying the maximum outline dimensions of the valve rocker arm, it is ensured that it will not collide or interfere with other components during installation and operation, while ensuring proper engine operation. Therefore, the application of this technical invention helps improve engine efficiency and reliability, while simplifying the design and production process and reducing manufacturing costs.

[0022] In any of the above technical solutions, the material of the valve rocker arm is ZL111.

[0023] This embodiment uses ZL111, an aluminum alloy with excellent mechanical properties and heat resistance, as the material for the valve rocker arm. This alloy performs exceptionally well in high-temperature environments, such as those found in automotive engines. By using ZL111 as the material for the valve rocker arm, the arm is ensured to possess sufficient strength and durability in high-temperature and high-pressure operating environments, thereby extending its service life and improving the reliability and stability of the entire engine system. Therefore, the application of this technical invention contributes to improved engine performance and reliability while reducing maintenance costs and replacement frequency.

[0024] In any of the above technical solutions, the blank mass of the valve rocker arm is 0.13kg-0.17kg.

[0025] Determining the quality of the initial material—the blank—is crucial to the manufacturing process, as it directly impacts the performance and quality of the final product. In this case, the valve rocker arm blank mass is specified between 0.13kg and 0.17kg, based on design requirements and engineering standards to ensure the final manufactured valve rocker arm possesses appropriate strength, stability, and weight. Maintaining the blank mass of the valve rocker arm within this range helps improve production efficiency, reduce scrap during production, and ensure consistent performance and reliability of the valve rocker arm throughout its service life. This precise control ensures proper engine system operation and ensures that the valve rocker arm withstands appropriate pressures and loads during operation.

[0026] After adopting the technical solution of the utility model, the following technical effects can be achieved:

[0027] (1) Low-pressure casting molds fill the metal into the mold at lower pressure, thereby reducing the formation of pores and shrinkage cavities;

[0028] (2) The diversion package fills the molten metal into the mold cavity by unloading the pressure, effectively preventing the mixing of gas or impurities;

[0029] (3) The mold cavity is arranged around the periphery of the diversion package. This layout helps the molten metal flow evenly in the mold, ensuring the quality and stability of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic cross-sectional view of a low-pressure casting mold according to an embodiment of the present invention from a main viewing angle;

[0031] Figure 2 A schematic cross-sectional view from a top view of a low-pressure casting mold provided by an embodiment of the present invention;

[0032] Figure 3 A schematic cross-sectional view of the lower mold insert according to an embodiment of the present invention from a main viewing angle;

[0033] Figure 4 A top view of the lower mold insert provided in an embodiment of the present utility model;

[0034] Figure 5 A schematic cross-sectional view of the upper mold insert according to an embodiment of the present invention from a main viewing angle;

[0035] Figure 6 A bottom view of the upper mold insert provided in an embodiment of the present utility model;

[0036] Figure 7 A schematic cross-sectional view of a main viewing angle of a sprue sleeve provided in an embodiment of the present invention;

[0037] Figure 8 A top view of a sprue bushing provided in an embodiment of the present utility model;

[0038] Figure 9 A schematic cross-sectional view of a pouring basin according to an embodiment of the present invention from a main viewing angle;

[0039] Figure 10 A top view of a pouring basin provided in an embodiment of the present utility model;

[0040] Figure 11 A left side view of a pouring basin provided in an embodiment of the present utility model;

[0041] Figure 12 A low-pressure casting diagram of a valve rocker arm provided in an embodiment of the present utility model;

[0042] Figure 13 This is a solidification simulation analysis diagram of the valve rocker arm provided in an embodiment of the present utility model.

[0043] Description of reference numerals:

[0044] 100-insert; 110-upper mold insert; 120-lower mold insert; 130-mold cavity; 200-diverter bag; 210-gate; 220-annular runner; 300-gate bushing; 400-upper mold frame; 500-lower mold frame; 510-gate basin; 511-insulation layer; 600-heating plate; 610-perforation; 620-heating tube. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] An embodiment of the present invention provides a low-pressure casting mold for a valve rocker arm, which includes: an insert 100, which includes an upper mold insert 110 and a lower mold insert 120, and the upper mold insert 110 and the lower mold insert 120 cooperate with each other to form a number of mold cavities 130; a diverter bag 200, and a number of gates 210 are arranged around the diverter bag 200; a gate sleeve 300, and the gate sleeve 300 is connected to the internal space of the diverter bag 200 to deliver the molten metal from the gate sleeve 300 to the diverter bag 200 and fill the mold cavity 130; wherein the mold cavity 130 is evenly distributed around the periphery of the diverter bag 200.

[0047] like Figures 1 to 6 As shown, the low-pressure casting mold for manufacturing valve rocker arms provided in this embodiment connects the internal space of the diverter bag 200 with the gate sleeve 300, so that the molten metal is sent from the gate sleeve 300 to the diverter bag 200 and injected into the mold cavity 130, thereby being able to cast small parts such as valve rocker arms. Among them, the upper mold insert 110 and the lower mold insert 120 cooperate with each other to form a number of mold cavities 130 for manufacturing valve rocker arms to ensure that the mold remains stable during the casting process to obtain high-quality products; a number of gates 210 are arranged around the diverter bag 200 for injecting molten metal into the mold cavity 130. Well-designed gates 210 can ensure that the molten metal evenly fills the mold cavity 130, reducing the generation of defects and bubbles; the diverter bag 200 is connected to the internal space of the gate sleeve 300, which is used to deliver the molten metal from the gate sleeve 300 to the diverter bag 200 and fill the mold cavity 130. This diversion system helps to control the flow of molten metal, thereby improving the quality and consistency of the product; the mold cavities 130 are evenly distributed on the periphery of the diverter bag 200, which enables multiple mold cavities 130 to be set up at the same time for production, thereby improving production efficiency and reducing production costs.

[0048] The original pouring process is to use gravity tilting pouring and top riser for shrinkage compensation. This pouring process can obtain better product quality, but the process yield is low, only 24%, the production efficiency is low, and the production cost is high. The low-pressure casting mold proposed in this embodiment is an improvement on the existing gravity tilting pouring process, and is produced by low-pressure pouring. It is required that the pouring process yield should be increased as much as possible while meeting the product quality. By adopting the annular runner 220 and enlarging it, a cavity is eventually formed in the middle of the mold cavity, which is the built-in diverter bag 200. Through numerical simulation analysis, the results show that the pouring process has no obvious defects in filling, solidification and shrinkage compensation, and the built-in diverter bag 200 can effectively compensate for the shrinkage of the casting, thereby obtaining a good casting.

[0049] Figure 12 This is the low-pressure casting diagram of the valve rocker arm in this embodiment. Figure 13 This is a solidification simulation analysis diagram of the valve rocker arm in this embodiment.

[0050] Among them, the low-pressure casting mold of this embodiment produced qualified castings in both trial molds and mass production, with a mass production qualification rate of over 98%. When calculating the process yield, the value was 60% when the intermediate runner diversion package 200 was not emptied. In the actual production process, through reasonable parameter adjustment, the intermediate diversion package 200 was emptied after pressure relief, and the final process yield reached 82%. At the same time, high-quality casting products were obtained, which greatly improved production efficiency and reduced production costs, achieving the purpose and requirements of mold improvement. Among them, the process yield refers to the percentage of the casting weight to the pouring weight.

[0051] Low-pressure casting molds use low-pressure pouring to introduce molten metal into the mold cavity 130 at relatively low pressure, thereby reducing the formation of pores and shrinkage cavities and making them suitable for manufacturing parts with complex shapes. Low-pressure casting molds can improve production efficiency, reduce material waste, and enhance product quality and stability, thereby reducing manufacturing costs and enhancing product competitiveness.

[0052] like Figures 7 and 8 As shown, it should also be noted that the valve rocker arm casting requires annealing before and after rough machining to reduce internal stress, improve mechanical properties, and eliminate casting defects such as pores and slag inclusions. In addition, the casting is also subject to airtightness testing after machining. This is an important means of ensuring its quality and performance, helping to identify and resolve potential problems and improve product reliability and safety. Preferably, the sprue bushing 300 can be made of ceramic material.

[0053] In some embodiments of the present application, each mold cavity 130 is connected to a corresponding gate 210 .

[0054] like Figure 2 As shown, by connecting each mold cavity 130 to a corresponding gate 210, this means that in the mold, each space to be cast has a dedicated gate 210 for injecting molten metal. This design ensures that each mold cavity 130 is fully and evenly filled, minimizing the generation of bubbles and defects. By providing an independent gate 210 for each mold cavity 130, the flow of molten metal can be better controlled, thereby improving the quality and consistency of the product. In specific production and manufacturing, one diversion package 200 corresponds to multiple mold cavities 130, which helps to further optimize the structure of the low-pressure casting mold, improve production efficiency, reduce costs, and enhance product reliability and quality.

[0055] In some embodiments of the present application, an annular runner 220 is provided inside the diversion package 200 , and the annular runner 220 surrounds and defines a cavity structure.

[0056] like Figure 2As shown, an annular runner 220 is designed inside the diverter bag 200, and a cavity structure is formed around the position of the gate sleeve 300. The diverter bag 200 is in an empty state after the pressure is released, and the molten metal inside will flow into all corners of the mold cavity 130, which is conducive to filling the mold cavity 130 with molten metal. At the same time, through the formation of the cavity structure, the flow and distribution of the molten metal can be better controlled, thereby ensuring the quality and consistency of the valve rocker arm casting. The low-pressure casting mold has no obvious defects in filling, solidification and shrinkage. The built-in diverter bag 200 can effectively compensate for the shrinkage of the casting, thereby obtaining a good casting. By optimizing the internal structure of the diverter bag 200, this technical solution further improves the performance and production efficiency of the low-pressure casting mold, and provides reliable process support for the manufacture of high-quality valve rocker arms.

[0057] In some embodiments of the present application, the low-pressure casting mold further includes an upper mold frame 400 and a lower mold frame 500 . The upper mold frame 400 is arranged on a side close to the upper mold insert 110 , and the lower mold frame 500 is arranged on a side close to the lower mold insert 120 .

[0058] like Figure 1 As shown, by arranging the upper mold frame 400 on one side of the upper mold insert 110 and the lower mold frame 500 on one side of the lower mold insert 120, the mutual cooperation between the upper mold frame 400 and the lower mold frame 500 makes it possible to adjust the assembly state of the mold to ensure that the gap or tightness between the upper mold insert 110 and the lower mold insert 120 reaches the optimal state. By adjusting the mold frame, the assembly of the mold can be flexibly controlled to adapt to the requirements of castings of different sizes or shapes. Therefore, the application of this technical solution makes the mold more flexible and adjustable during the production process, improves production efficiency and product quality, and reduces production costs. It should be noted that a heating pipe 620 can be provided inside the upper mold insert 110 and the lower mold insert 120, so that the molten metal flowing through the gate sleeve 300, the diverter bag 200 and the mold cavity 130 can be heated or kept warm to improve the molding quality of the casting.

[0059] In some embodiments of the present application, the lower mold frame 500 is provided with a pouring basin 510 , and the pouring basin 510 is communicated with the interior of the diversion package 200 .

[0060] like Figure 1 、 Figures 9 to 11As shown, by providing a pouring basin 510 on the lower mold frame 500 and ensuring that the diversion bag 200 is connected to the inside of the pouring basin 510, a more uniform and stable distribution of molten metal can be achieved, reducing the generation of gas and inclusions, thereby improving the quality of the casting and the molding efficiency. This design also helps to reduce the oxidation and leakage of the molten metal during the pouring process, further ensuring the consistency and stability of the casting. Therefore, the design of the pouring basin 510 helps to improve the efficiency and reliability of the casting process, while reducing the scrap rate and improving production efficiency. Among them, two gate sleeves 300 are connected above the pouring basin 510 to ensure that the two diversion bags 200 are emptied and cast workpieces at the same time, thereby improving production efficiency and saving production costs.

[0061] like Figure 9 As shown, it should be noted that the inner wall of the pouring basin 510 is provided with an insulation layer 511, which can reduce the loss of the molten metal temperature and ensure that the molten metal maintains a stable temperature when filling the mold, thereby reducing the occurrence of casting defects. In addition, the stable temperature helps to maintain the fluidity and quality of the molten metal, thereby improving production efficiency and reducing production interruptions.

[0062] In some embodiments of the present application, a heating plate 600 is provided between the diversion package 200 and the sprue bushing 300 , and the heating plate 600 is provided with a through hole 610 for the molten metal to pass through.

[0063] like Figure 1 As shown, by providing a heating plate 600 between the diverter bag 200 and the sprue sleeve 300, and the heating plate 600 is provided with a perforation 610 for the molten metal to pass through, the temperature control and stability of the molten metal during the low-pressure casting process are improved. By providing the heating plate 600 between the diverter bag 200 and the sprue sleeve 300, the molten metal can be effectively heated to ensure that it maintains ideal fluidity and castability during the flow process. The perforation 610 design on the heating plate 600 allows the molten metal to flow smoothly, and the heating effect of the heating plate 600 can reduce the risk of solidification of the molten metal, thereby reducing the possibility of defects in the production process. Therefore, this design helps to improve the molding quality of the casting, reduce the scrap rate in production, and at the same time improve production efficiency and cost-effectiveness.

[0064] In some embodiments of the present application, a plurality of heating tubes are provided inside the heating plate.

[0065] By providing a plurality of heating tubes 620 inside the heating plate 600, the temperature control and stability of the molten metal during the low-pressure casting process can be further improved. The installation of multiple heating tubes 620 inside the heating plate 600 can achieve more uniform and precise heating of the heating plate 600. These heating tubes 620 can adjust the temperature of the heating plate 600 by controlling the current or heat, thereby ensuring that the molten metal always maintains a suitable temperature during the flow process. This precise temperature control helps to reduce the solidification time of the molten metal and ensures that the molten metal maintains ideal fluidity and castability when filling the mold. Therefore, this design further improves the molding quality of the casting, reduces the scrap rate in production, and improves production efficiency and cost-effectiveness.

[0066] In some embodiments of the present application, the maximum outline size of the valve rocker arm is 108 mm×53 mm×34 mm.

[0067] like Figure 2 As shown, by controlling the maximum outline dimensions of the valve rocker arm within an appropriate range, it can be adapted to specific engine structures and performance requirements. As a critical engine component, the valve rocker arm's dimensions are crucial to engine performance and reliability. By specifying the maximum outline dimensions of the valve rocker arm, it is ensured that it will not collide or interfere with other components during installation and operation, while ensuring proper engine operation. Therefore, the application of this technical invention helps improve engine efficiency and reliability, while simplifying the design and production process and reducing manufacturing costs.

[0068] This embodiment controls the maximum outline size of the valve rocker arm within a certain range, indicating that the part cast by this application is a small part with a simple structure and low mass. Therefore, the control requirements for production costs are high, and a production process that can produce better benefits needs to be adopted. The low-pressure casting mold provided by this embodiment is provided with a diverter bag 200, and then the molten metal in the diverter bag 200 is filled into the mold cavity 130 in an empty state. Under this condition, the molten metal can better fill the gaps and compensate for shrinkage defects, and finally a well-formed valve rocker arm is cast.

[0069] In some embodiments of the present application, the material of the valve rocker arm is ZL111.

[0070] This embodiment uses ZL111, an aluminum alloy with excellent mechanical properties and heat resistance, as the material for the valve rocker arm. This alloy performs exceptionally well in high-temperature environments, such as those found in automotive engines. By using ZL111 as the material for the valve rocker arm, the arm is ensured to possess sufficient strength and durability in high-temperature and high-pressure operating environments, thereby extending its service life and improving the reliability and stability of the entire engine system. Therefore, the application of this technical invention contributes to improved engine performance and reliability while reducing maintenance costs and replacement frequency.

[0071] In some embodiments of the present application, the mass of the valve rocker arm blank is 0.13 kg-0.17 kg.

[0072] Determining the quality of the initial material—the blank—is crucial to the manufacturing process, as it directly impacts the performance and quality of the final product. In this case, the valve rocker arm blank mass is specified between 0.13kg and 0.17kg, based on design requirements and engineering standards to ensure the final manufactured valve rocker arm possesses appropriate strength, stability, and weight. Maintaining the blank mass of the valve rocker arm within this range helps improve production efficiency, reduce scrap during production, and ensure consistent performance and reliability of the valve rocker arm throughout its service life. This precise control ensures proper engine system operation and ensures that the valve rocker arm withstands appropriate pressures and loads during operation.

[0073] Although the present invention is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims

1. A low-pressure casting mold for a valve rocker arm, characterized in that: The low pressure casting mold comprises: Inserts (100), the inserts (100) comprising an upper mold insert (110) and a lower mold insert (120), the upper mold insert (110) and the lower mold insert (120) cooperating with each other to form a plurality of mold cavities (130); A diversion package (200), wherein a plurality of gates (210) are provided around the diversion package (200); a sprue bushing (300), the sprue bushing (300) being in communication with the inner space of the diversion package (200) so as to deliver the molten metal from the sprue bushing (300) to the diversion package (200) and fill the mold cavity (130); The mold cavity (130) is evenly distributed around the periphery of the diversion package (200).

2. The low-pressure casting mold according to claim 1, characterized in that: Each mold cavity (130) is correspondingly connected to one of the gates (210).

3. The low pressure casting mold according to claim 1, characterized in that: An annular runner (220) is provided inside the diversion package (200), and the annular runner (220) surrounds and defines a cavity structure.

4. The low-pressure casting mold according to claim 1, characterized in that The low-pressure casting mold further comprises an upper mold frame (400) and a lower mold frame (500), wherein the upper mold frame (400) is arranged on a side close to the upper mold insert (110), and the lower mold frame (500) is arranged on a side close to the lower mold insert (120).

5. The low-pressure casting mold according to claim 4, characterized in that: The lower mold frame (500) is provided with a pouring basin (510), and the pouring basin (510) is communicated with the interior of the diversion package (200).

6. The low pressure casting mold according to claim 1, characterized in that: A heating plate (600) is provided between the diversion package (200) and the sprue sleeve (300), and the heating plate (600) is provided with a perforation (610) for the passage of molten metal.

7. The low-pressure casting mold according to claim 6, characterized in that: Several heating tubes (620) are provided inside the heating plate (600).

8. The low pressure casting mold according to claim 1, characterized in that: The maximum outline size of the valve rocker arm is 108 mm×53 mm×34 mm.

9. The low-pressure casting mold according to claim 1, characterized in that: The material of the valve rocker arm is ZL111.

10. The low pressure casting mold according to claim 1, characterized in that: The blank mass of the valve rocker arm is 0.13kg-0.17kg.

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