Centrifugal casting mold for spheroidal graphite cast iron

Abstract

The present application relates to centrifugal casting technical field, disclose a kind of centrifugal casting mould of nodular cast iron piece, including centrifugal system, pouring system, the centrifugal system includes driving device, horizontal casting cylinder, the hollow inner cavity wall of the horizontal casting cylinder is used for the forming of casting piece, the driving device is used to drive the rotation of the horizontal casting cylinder, the pouring system is used to the feeding of the horizontal casting cylinder;The pouring system includes feeding device, pouring pipe, pouring hopper is equipped on the pouring pipe, the pouring hopper is used to receive the material sent by the feeding device, the opening length of the pouring hopper is consistent with the length of the hollow inner cavity wall, wherein, the opening of the pouring hopper is used to the feeding in the hollow inner cavity wall, and when feeding, the opening of the pouring hopper is simultaneously evenly discharged, its advantage lies in, it can be evenly fed to the centrifugal casting mould, improve the uniformity of the forming casting thickness, shorten centrifugal casting time.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a centrifugal casting mold for ductile iron parts. Background Technology

[0002] Centrifugal casting of ductile iron parts involves pouring molten metal into a high-speed rotating mold. Under centrifugal force, the molten metal evenly fills the mold and forms the free surface of the casting. This process achieves cylindrical internal holes without the need for a core.

[0003] In centrifugal casting, the gating system design plays a crucial role, ensuring its smooth flow and structural stability. Especially in horizontal centrifugal casting, existing gating systems typically cannot simultaneously pour along the length of the casting. The molten metal must spread from a point to a surface using centrifugal force. This method obviously requires a considerable amount of time to allow the molten metal to move sufficiently. Furthermore, because the pouring points are all located at the same location, the area containing the ring will be thicker than other areas after pouring, increasing the difficulty of grinding. Additionally, to ensure that other areas meet the required thickness, the amount of molten metal used is maximized, resulting in significant material consumption.

[0004] In summary, there is an urgent need for a centrifugal casting mold for ductile iron parts that can uniformly spread material within the centrifugal casting mold, improve casting accuracy, reduce material consumption, and lower the difficulty of subsequent processing. Summary of the Invention

[0005] In view of the problem of uneven material feeding in existing centrifugal casting molds, a centrifugal casting mold for ductile iron parts is proposed, which can uniformly spread material in the centrifugal casting mold, improve casting accuracy, reduce the consumption of casting materials, and reduce the difficulty of subsequent processing.

[0006] To solve the above problems, the technical solution of the present invention is as follows:

[0007] A centrifugal casting mold for ductile iron parts includes a centrifugal system and a gating system. The centrifugal system includes a drive device and a horizontal casting cylinder. The hollow inner wall of the horizontal casting cylinder is used for forming the casting. The drive device is used to drive the horizontal casting cylinder to rotate. The gating system is used to feed material into the horizontal casting cylinder. The gating system includes a feeding device and a pouring pipe. The pouring pipe is provided with a pouring hopper. The pouring hopper is used to receive the material fed by the feeding device. The opening length of the pouring hopper is consistent with the length of the hollow inner wall. The opening of the pouring hopper is used to feed material into the hollow inner wall, and during feeding, the opening of the pouring hopper simultaneously and uniformly discharges material.

[0008] As a preferred technical solution, the casting pipe is provided with a plurality of casting hoppers, and each casting hopper is evenly distributed around the central axis of the casting pipe.

[0009] As a preferred technical solution, a material collection bin is provided between the feeding device and the casting pipe, and a discharge port is provided at the bottom of the material collection bin. A discharge baffle is provided on at least one side of the discharge port, and the discharge baffle can block the opening of the casting hopper.

[0010] As a preferred technical solution, the length of the discharge port is not less than the length of the opening of the casting hopper.

[0011] As a preferred technical solution, the casting hopper is provided with a piston plate, which moves along the casting hopper to change the volume of the casting hopper.

[0012] As a preferred technical solution, the casting hopper extends through the casting pipe, and the piston plate divides the casting hopper into two parts.

[0013] As a preferred technical solution, the piston plate can be moved to the end of the casting hopper, and the upper and lower end faces of the piston plate are in contact with the outer wall of the casting pipe.

[0014] As a preferred technical solution, the piston plate at the bottom of the casting hopper is driven by a drive mechanism to move along the inner wall of the casting hopper.

[0015] The beneficial effects of this invention are:

[0016] The centrifugal casting mold for ductile iron parts of the present invention uses a pouring pipe set inside a horizontal casting cylinder for intermediate handling during the pouring process. The length of the opening of the pouring hopper on the pouring pipe, which is used to receive the molten metal, is consistent with the length of the casting. This ensures that the molten metal flows out simultaneously and uniformly during the final pouring, achieving uniform feeding at the beginning of casting. This improves the uniformity of the axial wall thickness of the casting after centrifugal forming, significantly shortens the centrifugal casting time, and when the material is uniformly poured onto the hollow inner wall, it can also be coordinated with the rotation speed of the horizontal casting cylinder to improve the uniformity of the radial thickness of the formed casting. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the centrifugal casting mold for the ductile iron parts described in this invention;

[0018] Figure 2 This is a partial cross-sectional schematic diagram of the centrifugal casting mold for the ductile iron parts described in this invention;

[0019] Figure 3 This is a cross-sectional plan view of the pouring pipe of the centrifugal casting mold for the ductile iron parts described in this invention;

[0020] Figure 4 A partial schematic diagram of the centrifugal casting mold for the ductile iron casting with a collection bin;

[0021] Figure 5 This is a cross-sectional plan view of the casting pipe with an aggregate bin;

[0022] Figure 6 A schematic diagram of the cross-sectional state of a casting hopper with a piston plate;

[0023] Figure 7 This is a schematic diagram of the cross-section of a casting hopper with a piston plate, in state two.

[0024] The reference numerals and components involved in the accompanying drawings are shown below:

[0025] 1. Drive unit; 2. Horizontal casting cylinder; 3. Mounting base; 4. Feeding device; 5. Casting pipe; 6. Collection bin; 11. Support roller; 12. Pressure roller device; 51. Casting hopper; 52. Piston plate; 61. Discharge baffle; 62. Discharge port. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To better understand the centrifugal casting mold for ductile iron parts provided in this embodiment, a brief introduction to existing centrifugal casting molds is given below. For example, Chinese patent application No. 2019113523857 discloses a horizontal centrifugal casting machine with uniform feeding, including a base and a motor, a feeding device, and a centrifugal cylinder mounted on the base. The centrifugal cylinder is fixed to the output end of the motor, and a support frame is fixed on the base. While the rotating motor drives the spiral blades to feed material horizontally and uniformly, the rotating motor drives the feeding component to move horizontally in the guide cylinder, thereby changing the position of the feeding component in the centrifugal cylinder. This makes the liquid metal distributed more evenly in the centrifugal cylinder, reducing the trouble of adding an electric control device to drive the horizontal movement of the guide cylinder, saving production costs. At the same time, the setting of the flow control device makes it easy to control the flow rate of the liquid metal, so that the speed at which the liquid metal flows into the centrifugal cylinder is not too fast, which is conducive to the natural cooling of the liquid metal. Although the feeder of this horizontal centrifugal casting machine can move horizontally within the guide cylinder, the outlet of the feeder is still a point outlet relative to the length of the guide cylinder. The molten metal flowing out can only contact a certain point in the guide cylinder. Moreover, the guide cylinder is constantly rotating, and the solution diffuses not only radially but also axially, resulting in a large degree of freedom in diffusion. This leads to poor uniformity and requires longer centrifugation time and speed to compensate for the defects as much as possible. To solve the above problems, the present invention provides a centrifugal casting mold for ductile iron parts as described below:

[0028] Please see the appendix Figure 1 , Figure 1This is a three-dimensional schematic diagram of the centrifugal casting mold for ductile iron parts according to the present invention. A centrifugal casting mold for ductile iron parts includes a centrifugal system and a gating system. The centrifugal system includes a drive device 1 and a horizontal casting cylinder 2. The hollow inner wall of the horizontal casting cylinder 2 is used for forming the casting. The drive device 1 is used to drive the horizontal casting cylinder 2 to rotate. Specifically, in this embodiment, the drive device 1 and the horizontal casting cylinder 2 are mounted on a mounting base 3. The drive device 1 consists of a motor, a transmission rod, support rollers 11, and a reduction gear set. There are two sets of support rollers 11, which are installed parallel to each other on the mounting base 3. One set is linked to the motor through the transmission rod, while the other set rotates freely. The horizontal casting cylinder 2 is mounted on the two sets of support rollers 11, with its axis parallel to the support rollers 11. To better drive the rotation of the horizontal casting cylinder 2, the support rollers 11 are provided with... The protruding disc is adapted to the annular groove on the outer wall of the horizontal casting cylinder 2. The disc on the support roller 11 drives the horizontal casting cylinder 2 to rotate through friction. Preferably, a pressure roller device 12 is provided directly above the horizontal casting cylinder 2. The pressure roller device 12 is a rod-shaped structure with a rotating wheel at one end. One end of the rod-shaped structure is fixed to a corresponding fixing member. The rotating wheel is in close contact with the outer wall of the horizontal casting cylinder 2 and transmits downward pressure to it, so that the horizontal casting cylinder 2 can better follow the support roller 11 to rotate. In some preferred embodiments, the rod-shaped structure that fixes the position of the rotating wheel can be a telescopic rod. When the telescopic rod controls the rotating wheel to separate from the horizontal casting cylinder 2, the horizontal casting cylinder 2 can be disassembled or replaced. At the same time, the telescopic rod can be adapted to horizontal casting cylinders 2 of different diameters. In some preferred embodiments, the driving method between the support roller 11 and the horizontal casting cylinder 2 can also be gear meshing drive. The horizontal casting cylinder 2 has a hollow center. The gating system feeds molten ductile iron material into the hollow inner wall of the horizontal casting cylinder 2 through this hollow center. The rotation of the horizontal casting cylinder 2 then disperses the material from the hollow inner wall to other locations. It should be understood that the more uniform the distribution of the material fed by the gating system, the more uniform the wall thickness of the casting after centrifugation, and the shorter the required centrifugal casting time. Therefore, to ensure a more uniform distribution of the material fed by the gating system, please refer to the appendix. Figure 2 , Figure 2This is a partial cross-sectional schematic diagram of the centrifugal casting mold for ductile iron parts according to the present invention. In this embodiment, the casting system includes a feeding device 4 and a casting pipe 5. The feeding device 4 is used to receive molten material and transfer it to the next process. For example, the feeding device 4 can transfer the material to the casting pipe 5. Specifically, in this embodiment, the casting pipe 5 is a cylindrical structure. The casting pipe 5 can rotate around its central axis, and the casting pipe 5 is coaxial with the horizontal casting cylinder 2. The casting pipe 5 is connected to a motor through a reduction gear set, a transmission rod, etc., and is driven to rotate by the motor. The casting pipe 5 is provided with at least one casting hopper 51. The casting hopper 51 is used to receive the material flowing out from the feeding device 4. The length of the casting hopper 51 is the same as the length of the hollow inner wall of the horizontal casting cylinder 2, and the internal space of the casting hopper 51 is uniform. That is, any segment of the casting hopper 51 of equal length has the same volume, length, width, and height, so that the molten liquid inside is uniformly distributed.

[0029] The centrifugal casting mold for ductile iron parts described in this invention is used as follows: When the opening of the pouring hopper 51 on the pouring pipe 5 is opposite to the outlet of the feeding device 4, the molten material is quantitatively poured into the hopper of the feeding device 4. The molten liquid flows into the pouring hopper 51 on the pouring pipe 5 along the corresponding channel. After the molten liquid in the pouring hopper 51 is full or leveled, the pouring pipe 5 is driven to rotate. The opening of the pouring hopper 51 begins to tilt towards the bottom of the hollow inner cavity wall. Since the opening of the pouring hopper 51 is the same length as the hollow inner cavity wall, the molten liquid flows towards the hollow inner cavity wall along the opening of the pouring hopper 51. At this time, the horizontal casting cylinder 2 is also rotating, so that the flowing molten liquid is evenly distributed on the hollow inner cavity wall. After the molten liquid in the pouring hopper 51 flows out, the opening of the pouring hopper 51 is aligned with the outlet of the feeding device 4 again, and the above pouring process is repeated.

[0030] The centrifugal casting mold for ductile iron parts of the present invention uses a pouring pipe 5 inside a horizontal casting cylinder 2 for intermediate handling during the pouring process. The length of the opening of the pouring hopper 51 on the pouring pipe 5, used to receive the molten metal, is consistent with the length of the casting. This ensures that the molten metal flows out simultaneously and uniformly during the final pouring, achieving uniform feeding at the start of casting. This improves the axial wall thickness uniformity of the casting after centrifugal forming and significantly shortens the centrifugal casting time. It should be noted that in the above embodiments, the pouring pipe 5 can also be a cuboid structure, and its central axis of rotation need not coincide with the rotation axis of the horizontal casting cylinder 2 but should remain parallel. Furthermore, it should be understood that when the material is uniformly poured onto the hollow inner wall, ensuring that the horizontal casting cylinder 2 rotates exactly an integer number of times at the end of unloading can also greatly improve the radial thickness uniformity of the formed casting. Therefore, to ensure uniform material release, the horizontal casting cylinder 2 can also be driven by an independent motor to precisely control the rotation angle of the pouring pipe 5.

[0031] In the above embodiments, when the material content in the pouring hopper 51 is insufficient for the casting to be formed in one step, a secondary feeding is required. At this time, it is necessary to wait for the feeding device 4 to feed material into the pouring hopper 51 again, which greatly reduces the pouring efficiency. To solve the above problem, please refer to the appendix. Figure 3 , Figure 3 This is a cross-sectional plan view of the pouring pipe of the centrifugal casting mold for ductile iron parts according to the present invention. In this embodiment, the pouring pipe 5 is provided with multiple pouring hoppers 51, and the pouring hoppers 51 are evenly distributed around the central axis of the pouring pipe 5. Each pouring hopper 51 is centrally symmetrical. During pouring, at least one set of pouring hoppers 51 receives the molten liquid from the feeding device 4 in a quantitative manner. When the pouring of liquid in the pouring hopper 51 is completed and the surface of the molten liquid is flat, the pouring pipe 5 is rotated so that the next adjacent pouring hopper 51 is aligned with the feeding device 4, while the pouring hopper 51 that was previously filled with molten liquid enters the unloading state. Therefore, in this embodiment, the feeding process and the unloading process are carried out simultaneously, so that the molten liquid continuously enters the hollow inner cavity wall until the required molten liquid quality of the casting is achieved. This greatly improves the casting efficiency and applicability of the centrifugal casting mold for ductile iron parts according to the present invention, enabling it to cast castings with a molten liquid requirement greater than the volume of the pouring hopper 51.

[0032] It is obvious that in the above embodiments, the feeding time of the casting hopper 51 and the time spent waiting for the molten metal to self-level within the casting hopper 51 will limit the continuity of the casting process. To more quickly fill the casting hopper 51 with molten metal, please refer to the appendix. Figure 4 Appendix Figure 5 , Figure 4 This is a partial schematic diagram of the centrifugal casting mold for the ductile iron part with a material collection bin. Figure 5The diagram shows a cross-sectional plan of a casting pipe with a collection bin. In this embodiment, a collection bin 6 is provided between the feeding device 4 and the casting pipe 5. The bottom of the collection bin 6 is in close contact with the outer wall of the casting pipe 5. The collection bin 6 has a cavity structure with a volume larger than that of the casting hopper 51. The outlet of the feeding device 4 delivers the solution into the collection bin 6. An outlet 62 is provided at the bottom of the cavity structure of the collection bin 6. When the opening of the casting hopper 51 coincides with the outlet 62 of the collection bin 6, the molten liquid in the collection bin 6 is transferred to the casting hopper 51. Preferably, the side of the outlet 62 at the bottom of the cavity structure of the collection bin 6 is a discharge baffle 61. The size of the discharge baffle 61 is large enough to completely fit and block the opening of the casting hopper 51. When using the centrifugal casting mold for ductile iron parts described in this embodiment, the collection bin 6 can be fixed on the mounting base 3 by a bracket, and its position remains unchanged. The casting pipe 5 continues to rotate, and the bottom of the collection bin 6... Covering the upper semi-cylindrical surface of the casting pipe 5, the cavity structure of the collection bin 6 is filled with molten liquid. When the opening of the casting hopper 51 on the rotating casting pipe 5 begins to coincide with the discharge port 62 at the bottom of the collection bin 6, the molten liquid flows in from the opening. Compared with the feeding method through the feeding device 4, the feeding efficiency is greatly increased. At the same time, as the casting pipe 5 rotates, one side of the casting hopper 51 gradually moves to the bottom of the discharge baffle 61. Under the closure of the discharge baffle 61, the molten liquid inside will not flow out. Meanwhile, the overlapping opening used to transfer the molten liquid changes from small to large and then back to small, ensuring that the molten liquid in the casting hopper 51 is filled. It should be understood that the partition between two adjacent casting hoppers 51 can block the discharge port 62 at the bottom of the collection bin 6, so that the molten liquid in the collection bin 6 can be replenished. The volume of molten liquid in the collection bin 6 can also be increased by increasing the feeding rate of the feeding device 4 to ensure that the volume of molten liquid in the collection bin 6 is greater than the volume of molten liquid in the casting hopper 51. In this embodiment, the centrifugal casting mold for ductile iron parts is equipped with a material collection bin 6 that provides intermediate storage, thus avoiding the problems of the feeding speed of the feeding device 4 and the time required for the solution to spread in the pouring hopper 51.

[0033] In centrifugal casting of ductile iron parts, since the inner surface of the casting is a free surface, the amount of molten metal poured into the mold directly determines the inner diameter and wall thickness of the casting. Precise control of the molten metal is essential to ensure the casting's accuracy and quality. Existing centrifugal casting methods rely on quantitative pouring. However, during this process, molten metal may remain on intermediate mechanisms such as the feeding device 4, resulting in the actual amount of molten metal used in the casting being less than the amount poured. In traditional centrifugal casting, uneven feeding on the inner surface of the casting compromises the quality of the inner surface. Therefore, adding excess molten metal is used to address both issues simultaneously. However, this approach obviously increases the burden of subsequent grinding processes, wastes materials, and reduces economic efficiency. Based on the centrifugal casting mold for ductile iron parts described in this invention, which addresses the issue of feeding uniformity, this invention also provides a centrifugal casting mold capable of molten metal metering at the end of the pouring process, as illustrated in the following embodiment:

[0034] Please see the appendix Figure 6 , Figure 6This is a schematic diagram of the cross-sectional state of a casting hopper with a piston plate. Based on the material collection bin 6 between the feeding device 4 and the casting pipe 5, a set of casting hoppers 51 are provided on the casting pipe 5. Of the four side walls of the casting hopper 51, adjacent side walls are perpendicular, and opposite side walls are parallel. The piston plate 52 passes through the central axis of the casting pipe 5. A piston plate 52 is provided inside the casting hopper 51. The side wall of the piston plate 52 fits against the side wall of the casting hopper 51 and can move up and down along the inner cavity of the casting hopper 51. The piston plate 52 divides the inner cavity of the casting hopper 51 into upper and lower sections. The vessel consists of two parts, with the upper and lower cavities not communicating with each other. The upper and lower end faces of the piston plate 52 are fitted to the shape of the outer wall of the casting pipe 5. That is, when the outer wall of the casting pipe 5 is flat, the end face of the piston plate 52 is flat, and when the outer wall of the casting pipe 5 is curved, the end face of the piston plate 52 is also a matching curved surface. The piston plate 52 can be moved to the end of the casting hopper 51. The piston plate 52 located at the end of the casting hopper 51 fills the opening of the casting hopper 51 on the casting pipe 5. The outer wall of the piston plate 52 and the outer wall of the casting pipe 5 are smoothly connected to form a whole. Preferably, the piston plate 52 is slidably connected to the side wall of the casting hopper 51 via a planar connection. The piston plate 52 slides along the inner wall of the casting hopper 51 under its own weight. The bottom of the collecting hopper 6 completely covers the outer wall of the upper semi-cylindrical area of ​​the casting pipe 5. In the use of the centrifugal casting mold for ductile iron parts described in this embodiment, in the initial state, the upper opening of the casting hopper 51 is directly opposite the discharge port 62 at the bottom of the collecting hopper 6, and the lower opening is located directly below. The piston plate 52 inside is located at the lower end of the casting hopper 51. It should be understood that... The lower end refers to the bottom relative to the entire device and does not change with the rotation of the pouring hopper 51; the collecting bin 6 and the pouring hopper 51 are filled with molten metal. The pouring pipe 5 begins to rotate, and the upper opening of the pouring hopper 51 moves toward the discharge baffle 61. When the pouring hopper 51 rotates to the horizontal position, the opening of the pouring hopper 51 begins to move away from the bottom surface of the collecting bin 6, and the molten metal begins to flow out. The piston plate 52 at the other end begins to move to the upper position of the pouring hopper 51 and toward the discharge port 62 of the collecting bin 6. Meanwhile, please refer to the attached... Figure 7 , Figure 7The diagram shows a cross-sectional view of the casting hopper with a piston plate in state two. The piston plate 52 begins to move downwards, i.e., to the other end where material is being discharged. The volume of the casting hopper 51 located above gradually increases and draws in the molten material from the collection bin 6. Meanwhile, the molten material remaining on the inner wall of the other section of the casting hopper 51 is scraped out of the casting hopper 51 by the movement of the piston plate 52. Therefore, in one casting, the solution in the casting hopper 51 is completely fed into the horizontal casting cylinder 2. The volume of the casting hopper 51 is the amount of molten material entering the horizontal casting cylinder 2. The number of rotations of the casting pipe 5 determines the number of times the casting hopper 51 is used for casting, thus providing high-precision quantitative material supply for the centrifugal casting process. It should be noted that during the movement of the piston plate 52, the molten liquid in the collection bin 6 also provides downward pressure to the piston plate 52, enabling it to move smoothly downward. When the piston plate 52 rotates from bottom to top, the solution adhering to its end face will be scraped off at the intersection with the edge of the collection bin 6, further improving the accuracy of the feeding. Protruding blocks can be set at the openings at both ends of the pouring hopper 51, and the corresponding piston plate 52 is provided with grooves for the blocks to be embedded in, in order to prevent the piston plate 52 from falling out of the pouring hopper 51.

[0035] Preferably, in some embodiments, in order to maintain a faster rotation speed of the pouring pipe 5 and increase the feeding speed, the pouring pipe 5 is also surrounded by several pouring hoppers 51 with only one opening, and the inner wall of the pouring hopper 51 is also a square regular structure. The bottom of the pouring hopper 51 is provided with a piston plate 52 that is driven by a drive mechanism to move along the inner wall of the pouring hopper 51. The piston plate 52 driven by the drive mechanism can provide active negative pressure to quickly draw the molten liquid in the collection bin 6 when liquid is fed in, and push the piston plate 52 to quickly discharge the material when unloading, thereby improving the continuity and speed of feeding. The drive mechanism can be a high-temperature resistant telescopic drive mechanism, and a cooling mechanism can also be provided for the drive mechanism. This is the prior art and will not be described in detail here.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and additions without departing from the principle of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention.

Claims

1. A centrifugal casting mold for ductile iron parts, comprising a centrifugal system and a gating system, wherein the centrifugal system includes a driving device and a horizontal casting cylinder, the hollow inner wall of the horizontal casting cylinder is used for forming the casting, the driving device is used to drive the horizontal casting cylinder to rotate, and the gating system is used to feed material into the horizontal casting cylinder; characterized in that, The casting system includes a feeding device and a casting pipe. A casting hopper is provided on the casting pipe to receive the material fed by the feeding device. The opening length of the casting hopper is the same as the length of the hollow inner cavity wall. The opening of the casting hopper is used to feed material into the hollow inner cavity wall, and during feeding, the opening of the casting hopper simultaneously and evenly discharges material. The casting hopper penetrates the casting pipe. A piston plate is provided inside the casting hopper, dividing the casting hopper into two parts. The upper and lower end faces of the piston plate conform to the shape of the outer wall surface of the casting pipe. The piston plate moves along the casting hopper to change its volume. The piston plate can move to the end of the casting hopper. A collection bin is provided between the feeding device and the casting pipe. The bottom of the collection bin has a discharge port. The bottom of the collection bin is in close contact with the outer wall of the casting pipe and covers the upper semi-cylindrical surface of the casting pipe.

2. The centrifugal casting mold for ductile iron parts according to claim 1, characterized in that, The discharge port is provided with a discharge baffle on at least one side, and the discharge baffle can block the opening of the casting hopper.

3. The centrifugal casting mold for ductile iron parts according to claim 1, characterized in that, The length of the discharge port is not less than the length of the opening of the casting hopper.

4. The centrifugal casting mold for ductile iron parts according to claim 1, characterized in that, The piston plate at the bottom of the casting hopper is driven by a drive mechanism to move along the inner wall of the casting hopper.

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