Diesel engine flywheel casting mold and casting method

Abstract

The application discloses a diesel engine flywheel casting mold and a casting method. The diesel engine flywheel casting mold comprises a lower mold, a first recess is defined in the lower mold; an upper mold is combined with the lower mold, the upper mold defines a second recess, and the upper mold is provided with a pouring hole and a vent hole, the first recess cooperates with the second recess to form a flywheel casting cavity; the pouring hole and the vent hole are communicated with the second recess; a first heat pipe is installed on the lower mold and is arranged below a central area of the first recess; a second heat pipe is installed on the lower mold and is arranged below an edge of the first recess; a positioning rod is installed on the lower mold and is arranged in the second recess, the positioning rod extends upwards and penetrates through the upper mold; and an ultrasonic vibration device is connected with an end of the positioning rod penetrating through the upper mold. The diesel engine flywheel casting mold can improve the casting quality, reduce the waste rate, and further reduce the processing cost.

Description

Technical Field

[0001] This application relates to the field of flywheel casting technology, and in particular to a diesel engine flywheel casting mold and casting method. Background Technology

[0002] Casting is a widely used metal forming process and the main processing method for obtaining component blanks in the machinery manufacturing field. The conventional process is as follows: solid metal raw materials are melted into molten metal liquid that meets the pouring requirements, and then poured into a pre-prepared casting cavity via a ladle. After the molten metal liquid has completely cooled and solidified, the casting is demolded and removed, thus completing the entire processing process.

[0003] However, there are still two types of technical problems in current casting production. First, when molten metal is injected into the mold cavity, it is easily affected by fluctuations in the pouring flow rate, insufficient air removal from the mold cavity, and entrapment of filling disturbances, which can easily trap a large number of pores. After solidification, these pores remain permanently inside or near the surface of the casting, destroying the structural continuity and density, significantly reducing the mechanical strength, fatigue resistance, and surface finish of the casting, and directly lowering the finished product qualification rate and service life. Second, when producing large castings, the temperature field distribution in the mold cavity is uneven after filling in the conventional center casting process. The heat exchange efficiency is high and the cooling is fast in the edge area of ​​the inner wall of the mold cavity, while the heat is concentrated in the center casting area, the heat exchange path is long, and the cooling is significantly delayed. This uneven solidification can easily cause defects such as shrinkage cavities, shrinkage porosity, internal cracks, and uneven distribution of residual stress, which not only deteriorates the finished product quality and performance of large castings, but also increases the scrap rate and processing costs of production enterprises. Summary of the Invention

[0004] To address the aforementioned technical problems, this application proposes a diesel engine flywheel casting mold that can improve casting quality, reduce scrap rate, and thus lower processing costs.

[0005] This application also proposes a casting method applicable to the aforementioned diesel engine flywheel casting mold.

[0006] The diesel engine flywheel casting mold of the first aspect of this application includes: Use the lower mold to define the first groove; An upper mold covers the lower mold, the upper mold defines a second groove, and is provided with a casting hole and a vent hole. The first groove and the second groove cooperate to form a flywheel casting cavity; the casting hole and the vent hole are both connected to the second groove. The first heat pipe is installed in the lower mold and is located below the central area of ​​the first groove; The second heat pipe is installed in the lower mold and positioned below the edge of the first groove; A positioning rod is installed in the lower mold and disposed in the second groove; the positioning rod extends upward and passes through the upper mold. An ultrasonic vibration device is connected to the end of the positioning rod that passes through the upper mold.

[0007] The diesel engine flywheel casting mold of this application embodiment has at least the following beneficial effects: By heating the central area of ​​the first groove with the first heat pipe and the edge area of ​​the first groove with the second heat pipe, the uniformity of the temperature field distribution in the cavity can be improved, thereby reducing the probability of defects such as shrinkage cavities, shrinkage porosity, internal cracks and uneven distribution of residual stress in the finished product; the positioning rod is connected to an ultrasonic vibration device, which can effectively reduce the bubbles generated during the flow of molten metal, improve the continuity and density of the finished product structure, increase the product qualification rate, reduce the scrap rate, and thus reduce processing costs.

[0008] In some embodiments of this application, the lower mold is equipped with a first protruding ring, which is disposed within the first groove; The upper mold is equipped with a second protruding ring, which is corresponding to the first protruding ring and is disposed in the second groove.

[0009] In some embodiments of this application, the lower mold is provided with an mounting ring groove, which is disposed at the bottom of the first groove; The first convex ring is movably and vertically installed in the mounting ring groove and is connected to a drive mechanism that drives its lifting and lowering. The drive mechanism is located below the mounting ring groove.

[0010] In some embodiments of this application, the second heat pipe is configured as a coil, and the second heat pipe is wound around the outer periphery of the mounting annular groove.

[0011] In some embodiments of this application, the lower mold is further provided with a positioning post, which extends upward into the casting hole.

[0012] In some embodiments of this application, the first heat pipe is configured as a coil, and the first heat pipe is wound around the outer periphery of the positioning post.

[0013] In some embodiments of this application, the casting hole is located at the center of the second groove, and the vent hole is located at the edge region of the second groove; The ventilation holes are provided in multiple ways, and the multiple ventilation holes are evenly spaced around the circumference.

[0014] The casting method of the second aspect of this application, applicable to the above-mentioned diesel engine flywheel casting mold, includes the following steps: The upper mold covers the lower mold and is connected by fasteners to form the flywheel casting cavity; The first heat pipe heats to a first set temperature, and the second heat pipe heats to a second set temperature; Molten metal is poured into the flywheel casting cavity through the casting hole; Start the ultrasonic vibration device; after stopping the casting of molten metal, the ultrasonic vibration device will stop after running for a set time.

[0015] In some embodiments of this application, before molten metal is poured into the flywheel casting cavity, the drive mechanism drives the first convex ring to descend into the mounting ring groove; When molten metal is observed flowing out of the vent hole, the drive mechanism drives the first convex ring to rise to the end position of the stroke and makes it protrude out of the mounting ring groove.

[0016] In some embodiments of this application, the first set temperature is lower than the second set temperature.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a cross-sectional schematic diagram of a diesel engine flywheel casting mold according to an embodiment of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a top view of the diesel engine flywheel casting mold according to an embodiment of this application.

[0019] Icon labels: The components include: lower mold 100, first groove 110, first protruding ring 111, mounting ring groove 120, drive mechanism 121, and positioning pin 130. Upper mold 200, second groove 210, second convex ring 211, casting hole 220, vent hole 230; First heat pipe 300; Second heat pipe 400; Positioning rod 500, ultrasonic vibration device 510. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, "multiple" refers to two or more. If "first" or "second" is mentioned, it is only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The embodiments of this application may omit unnecessary detailed descriptions. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0025] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0026] Reference Figures 1 to 3 The first aspect of this application discloses a diesel engine flywheel casting mold, including a lower mold 100 and an upper mold 200. When pouring molten metal, the upper mold 200 covers the lower mold 100 and is connected by fasteners. The split upper and lower mold structure facilitates the subsequent mold opening and removal of the formed flywheel, and also facilitates precise alignment and positioning when closing the mold, effectively reducing the problem of finished product dimensional deviation caused by mold misalignment.

[0027] Reference Figure 1As shown, the lower mold 100 defines a first groove 110, and the upper mold 200 defines a second groove 210. The first groove 110 and the second groove 210 cooperate to form a flywheel casting cavity. The upper mold 200 is also provided with a casting hole 220 and a vent hole 230. Both the casting hole 220 and the vent hole 230 are connected to the second groove 210. The casting hole 220 is the inlet for pouring molten metal into the flywheel casting cavity, and the vent hole 230 is used to discharge gas from the flywheel casting cavity. When the flywheel casting cavity is full of molten metal, some of the molten metal will overflow from the vent hole 230, thus visually confirming that the flywheel casting cavity is full of molten metal. There is no need to set up an additional liquid level detection device in the cavity, which simplifies the mold structure and reduces the additional cost of production equipment.

[0028] In some embodiments of this application, the lower mold 100 is equipped with a first heat pipe 300 and a second heat pipe 400. The first heat pipe 300 is disposed below the central region of the first groove 110, and the second heat pipe 400 is disposed below the edge of the first groove 110. (See also...) Figure 1 As shown, the casting hole 220 is located at the center of the second groove 210, aligned with the center area of ​​the first groove 110. Considering that the temperature inside the flywheel casting cavity is low before molten metal is poured into it, the molten metal initially poured into the casting hole 220 will experience a large temperature difference. Localized rapid cooling will not only prematurely reduce the fluidity of the molten metal, but also easily generate uneven internal stress, thus affecting the quality of the final product. Therefore, a first heat pipe 300 is provided to heat the center area of ​​the first groove 110 before pouring the molten metal into the flywheel casting cavity, reducing the initial temperature drop after the molten metal enters the cavity. This can reduce the adverse effects of the temperature difference inside the cavity on the initially poured molten metal, avoid a decrease in the quality of the finished product, and at the same time ensure the overall fluidity of the molten metal.

[0029] The flywheel casting mold in this embodiment is designed for large diesel engine flywheel components. Due to the large overall diameter of the flywheel, the temperature difference between the central and edge areas of the casting cavity is significant. The central area accumulates more heat and dissipates it more slowly, resulting in a significantly slower cooling rate compared to the edge areas. This inherent temperature gradient easily leads to the edge solidifying first, followed by the center, ultimately causing shrinkage cavities and porosity defects in the center. Therefore, a second heat pipe 400 is provided to heat the edge areas of the flywheel casting cavity. This reduces the cooling rate of the molten metal at the edge areas, allowing it to flow more quickly and fully to all edges and corners of the casting cavity, preventing insufficient material at the edges. Furthermore, it reduces the overall temperature difference between the central and edge areas, resulting in a more uniform cooling rate of the molten metal throughout the cavity. This reduces the impact of uneven solidification of the molten metal on the mechanical properties and internal quality of the finished product, meeting the strength requirements of diesel engines operating under high torque conditions.

[0030] The first heat pipe 300 and the second heat pipe 400 are preferably coiled. The coil structure can increase the contact area between the heating pipe and the mold body, improve the heat exchange efficiency, and allow the heat to be diffused more evenly to the corresponding area, avoiding the problem of uneven local heating. It is also more suitable for the heating requirements of the annular flywheel cavity. Other heating devices can also be used according to actual needs.

[0031] In some embodiments of this application, the lower mold 100 is also equipped with a positioning rod 500, see reference Figure 1 As shown, the positioning rod 500 is disposed within the first groove 110, extends upward and passes through the upper mold 200, and the end of the positioning rod 500 passing through the upper mold 200 is connected to an ultrasonic vibration device 510. After the molten metal is poured into the flywheel casting cavity, the ultrasonic vibration device 510 is activated. During the filling and flow of the molten metal, it will entrain air inside the cavity and generate new bubbles due to the flow and turbulence. If the bubbles cannot be discharged in time, they will form porosity defects, disrupting the continuity of the flywheel structure and affecting the dynamic balance accuracy. Ultrasonic vibration can effectively promote the aggregation and upward discharge of small bubbles, reduce the bubbles generated during the flow of molten metal, improve the continuity and density of the finished product structure, increase the product qualification rate, reduce the scrap rate, and thus reduce processing costs.

[0032] Reference Figure 3 As shown, multiple positioning rods 500 are provided, evenly spaced around the circumference. The specific number of positioning rods 500 is determined according to the manufacturing requirements of the flywheel. The evenly distributed positioning rods 500 ensure that the molten metal in all areas of the entire cavity receives sufficient ultrasonic vibration, avoiding vibration blind spots. Simultaneously, in the areas where positioning rods 500 are provided, corresponding holes can be left for the flywheel position on the finished product. These pre-drilled holes can be directly used as mounting holes for the flywheel, eliminating the need for subsequent secondary drilling and further improving production efficiency.

[0033] In some embodiments of this application, the lower mold 100 is further provided with a positioning post 130, which extends upward into the casting hole 220. (See also...) Figure 1 As shown, the positioning post 130 has, on the one hand, a center hole pre-drilled in the center area of ​​the finished product to meet the assembly requirements of the flywheel; on the other hand, the positioning post 130 is set as... Figure 1 As shown, the conical structure causes molten metal to rush directly to the center of the mold cavity bottom when injected from the casting hole 220. Long-term impact can accelerate wear on the mold cavity surface. The conical structure effectively diverts the poured molten metal, significantly buffering the impact force, reducing damage to the mold surface, and extending the equipment's lifespan. Simultaneously, the diverted molten metal flows more smoothly, reducing splashing, improving operational safety, and minimizing waste of metal raw materials.

[0034] In some embodiments of this application, the first heat pipe 300 is configured as a coil. The first heat pipe 300 is wrapped around the outer periphery of the positioning post 130, which can ensure that the heating area accurately corresponds to the central area of ​​the first groove 110 and fits the contour of the central area. This allows the heat to be concentrated in the area that needs to be preheated, so that the area that does not need to be heated is not heated and heat is wasted. It can also ensure that the preheating temperature of the central area is uniform and meets the standard, thereby improving the accuracy of heating and energy utilization efficiency.

[0035] In some embodiments of this application, vent holes 230 are disposed at the edge region of the second groove 210, and multiple vent holes 230 are provided, evenly spaced around the circumference. Specifically, the vent holes 230 are disposed at the edge region of the second groove 210. When molten metal overflows from the vent holes 230, it can be visually confirmed that the corresponding position is filled with molten metal. Since the edge span of the large flywheel cavity is large, a single vent hole 230 can only reflect the local filling status. If a single vent hole 230 overflows but other edge regions are not yet filled, it is easy to misjudge and stop casting prematurely, resulting in insufficient material in the finished product. By providing multiple evenly distributed vent holes 230, it is possible to visually confirm whether all edge regions of the flywheel casting cavity have been filled with molten metal, effectively avoiding misjudgment and improving the finished product qualification rate.

[0036] In some embodiments of this application, the lower mold 100 is equipped with a first protruding ring 111, which is disposed within a first groove 110; the upper mold 200 is equipped with a second protruding ring 211, which is correspondingly disposed to the first protruding ring 111 and is disposed within a second groove 210. Specifically, refer to... Figure 1 , Figure 2 As shown, the position and shape of the first convex ring 111 and the second convex ring 211 must meet the design requirements of the flywheel. The two can work together to integrally process an inner ring structure that meets the design requirements on the formed flywheel, thus satisfying the assembly design requirements of the flywheel.

[0037] Furthermore, refer to Figure 2 As shown, the lower mold 100 is provided with a mounting ring groove 120, which is located at the bottom of the first groove 110. The first convex ring 111 is movably and vertically mounted in the mounting ring groove 120 and is connected to a drive mechanism 121 that drives its lifting and lowering. The drive mechanism 121 is located below the mounting ring groove 120. The drive mechanism 121 can be selected with a suitable telescopic structure according to the actual situation, which is not limited in this embodiment.

[0038] Before pouring molten metal into the flywheel casting cavity, the drive mechanism 121 drives the first protruding ring 111 to descend into the mounting ring groove 120. If the first protruding ring 111 is initially in the working position, the ring itself will obstruct the path of the molten metal flowing to the edge, slowing down the filling speed and easily causing the molten metal at the edge to cool and solidify prematurely. By pre-retracting the first protruding ring 111 into the groove, the flow path from the center to the edge of the cavity becomes smoother, allowing the molten metal to flow quickly and unobstructed to the edge area of ​​the flywheel casting cavity. After observing molten metal flowing out of the vent hole 230 and confirming that the overall cavity filling is complete, the drive mechanism 121 drives the first protruding ring 111 to rise to the end position of its stroke and protrude from the mounting ring groove 120 to ensure that the cooled and formed flywheel structure meets the design requirements. This design solves the problem of the fixed protruding ring obstructing the filling process and ensures that the finished product structure meets the design requirements.

[0039] In some embodiments of this application, the second heat pipe 400 is configured as a coil and is wound around the outer periphery of the mounting ring groove 120. When the first convex ring 111 descends into the mounting ring groove 120, molten metal will partially enter the mounting ring groove 120 to fill the space vacated by the first convex ring 111. If the molten metal entering the groove cools and solidifies prematurely, a solidified layer will form in the groove, blocking the upward path of the first convex ring 111, causing the first convex ring 111 to fail to reach its final position. The second heat pipe 400, wound around the outer periphery of the mounting ring groove 120, can maintain the temperature of the mounting ring groove 120 area and slow down the cooling rate of the molten metal entering the mounting ring groove 120. When the filling is completed and the convex ring needs to be ejected, the molten metal in the groove remains in a flowable molten state, thereby ensuring that the drive mechanism 121 can smoothly drive the first convex ring 111 to rise and fall, ensuring the operational reliability of the lifting structure.

[0040] The diesel engine flywheel casting mold of this application heats the central area of ​​the first groove 110 through the first heat pipe 300 and the edge area of ​​the first groove 110 through the second heat pipe 400. This allows for targeted adjustment of the temperature in different areas of the cavity, improving the uniformity of the overall temperature field distribution in the cavity, and thus reducing the probability of defects such as shrinkage cavities, shrinkage porosity, internal cracks, and uneven distribution of residual stress in the finished product. The positioning rod 500 is connected to an ultrasonic vibration device 510, which can effectively promote the discharge of air bubbles, reduce air bubbles generated during the flow of molten metal, improve the continuity and density of the finished product structure, increase the product qualification rate, reduce the scrap rate, and thus reduce processing costs.

[0041] The casting method of the second aspect of this application, applicable to the above-mentioned diesel engine flywheel casting mold, includes the following steps: S1. The upper mold 200 covers the lower mold 100 and is connected by fasteners to form a flywheel casting cavity; S2, the first heat pipe 300 heats to the first set temperature, and the second heat pipe 400 heats to the second set temperature; S3. After the first heat pipe 300 is heated to the first set temperature and the second heat pipe 400 is heated to the second set temperature, both the first heat pipe 300 and the second heat pipe 400 stop heating, and within a set time period, molten metal is poured into the flywheel casting cavity through the casting hole 220. The set time period can be set according to the actual situation to ensure that the areas heated by the first heat pipe 300 and the areas heated by the second heat pipe 400 still have a high temperature. S4. Start the ultrasonic vibration device 510; after stopping the casting of molten metal, the ultrasonic vibration device 510 runs for a set time and then stops; the set time for the ultrasonic vibration device 510 can be set according to the actual situation, and is not limited in this embodiment. However, it should be noted that the set time here should not be too long, so as to avoid affecting the cooling and forming of the molten metal.

[0042] In some embodiments of this application, the first set temperature is lower than the second set temperature. Specifically, the first heat pipe 300 is located in the central region of the first groove 110. During the casting of molten metal, new high-temperature molten metal is continuously injected into this region, rapidly accumulating heat and raising the temperature. It is only necessary to reduce the impact of the initial temperature difference on the initially poured molten metal; therefore, the first set temperature here does not need to be too high. The second heat pipe 400 is located in the edge region of the first groove 110. This region is far from the casting inlet, receives less heat, and cools faster than the central region. A higher preheating temperature can delay cooling, which is beneficial for the molten metal to flow to the edge region of the first groove 110, ensuring complete filling. Therefore, the second set temperature needs to be set higher. This differentiated gradient temperature setting not only matches the temperature change patterns of different regions and meets the temperature control requirements but also avoids unnecessary energy waste, making it more energy-efficient and reasonable.

[0043] The first and second set temperatures can be set according to actual conditions, and are not limited in this embodiment.

[0044] Throughout this specification, references to "implementation method," "partial implementation method," "one implementation method," "another method," "specific method," or "partial method" mean that at least one implementation method or embodiment in this application includes the specific features, structures, materials, or characteristics described in that implementation method or embodiment.

[0045] In this application, numerical ranges are involved. Unless otherwise specified, the numerical ranges mentioned above are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0046] Although illustrative embodiments have been demonstrated and described, those skilled in the art should understand that the above embodiments should not be construed as limiting the present application, and that changes, substitutions and modifications can be made to the embodiments without departing from the spirit, principles and scope of the present application.

Claims

1. A diesel engine flywheel casting mold, characterized in that, include: Use the lower mold to define the first groove; An upper mold covers the lower mold, the upper mold defines a second groove, and is provided with a casting hole and a vent hole. The first groove and the second groove cooperate to form a flywheel casting cavity; the casting hole and the vent hole are both connected to the second groove. The first heat pipe is installed in the lower mold and is located below the central area of ​​the first groove; The second heat pipe is installed in the lower mold and positioned below the edge of the first groove; A positioning rod is installed in the lower mold and disposed in the second groove, the positioning rod extending upward and passing through the upper mold; An ultrasonic vibration device is connected to the end of the positioning rod that passes through the upper mold.

2. The diesel engine flywheel casting mold according to claim 1, characterized in that, The lower mold is equipped with a first protruding ring, which is disposed within the first groove; The upper mold is equipped with a second protruding ring, which is corresponding to the first protruding ring and is disposed in the second groove.

3. The diesel engine flywheel casting mold according to claim 2, characterized in that, The lower mold is provided with an installation ring groove, which is located at the bottom of the first groove; The first convex ring is movably and vertically installed in the mounting ring groove and is connected to a drive mechanism that drives its lifting and lowering. The drive mechanism is located below the mounting ring groove.

4. The diesel engine flywheel casting mold according to claim 3, characterized in that, The second heat pipe is configured as a coil and is wound around the outer periphery of the mounting annular groove.

5. The diesel engine flywheel casting mold according to claim 1, characterized in that, The lower mold is also provided with a positioning post, which extends upward into the casting hole.

6. The diesel engine flywheel casting mold according to claim 5, characterized in that, The first heat pipe is configured as a coil and is wound around the outer periphery of the positioning post.

7. The diesel engine flywheel casting mold according to claim 1, characterized in that, The casting hole is located at the center of the second groove, and the vent hole is located at the edge area of ​​the second groove; The ventilation holes are provided in multiple ways, and the multiple ventilation holes are evenly spaced around the circumference.

8. A casting method applicable to the diesel engine flywheel casting mold according to any one of claims 1 to 7, characterized in that, Includes the following steps: The upper mold covers the lower mold and is connected by fasteners to form the flywheel casting cavity; The first heat pipe heats to a first set temperature, and the second heat pipe heats to a second set temperature; Molten metal is poured into the flywheel casting cavity through the casting hole; Start the ultrasonic vibration device; after stopping the casting of molten metal, the ultrasonic vibration device will stop after running for a set time.

9. The casting method according to claim 8, characterized in that, Before pouring molten metal into the flywheel casting cavity, the drive mechanism drives the first convex ring to descend into the mounting ring groove; When molten metal is observed flowing out of the vent hole, the drive mechanism drives the first convex ring to rise to the end position of the stroke and makes it protrude out of the mounting ring groove.

10. The casting method according to claim 8, characterized in that, The first set temperature is lower than the second set temperature.

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