Steady-flow pouring system for cylindrical casting

Abstract

The invention relates to the technical field of casting, in particular to a steady-flow gating system for cylindrical castings, which comprises a cylindrical casting cavity, a sprue cup, a sprue runner and cross gates, two ends of the sprue runner are respectively communicated with the sprue cup and each cross gate, and the cross gates extend along the radial direction of the sprue runner and are communicated with the cavity; a plurality of flow stabilizing pieces are arranged on the straight pouring runner, each flow stabilizing piece comprises a flow stabilizing cavity, an inlet section and an outlet section, the inlet section and the outlet section are arranged at the two ends of the flow stabilizing cavity correspondingly and communicate with the straight pouring runner, a flow stabilizing barrel extending in the axial direction of the flow stabilizing cavity is arranged in the flow stabilizing cavity, and an annular cavity is formed between the flow stabilizing barrel and the flow stabilizing cavity; the inner diameter of the annular cavity is larger than that of the straight pouring runner, the bottom end of the flow stabilizing cylinder communicates with the outlet section, the top end of the flow stabilizing cylinder is closed, the inlet section communicates with the annular cavity, and through holes are formed in the peripheral wall of the flow stabilizing cylinder. The hot erosion damage of molten metal to the bottom of the direct pouring runner and the wall surface of the cylindrical casting cavity can be inhibited.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a steady-flow pouring system for cylindrical castings. Background Technology

[0002] Currently, large cylindrical castings are typically poured using gravity. When the height of the cylindrical casting exceeds 500mm, a bottom-pouring gating system is usually preferred to ensure stable filling of the mold cavity with molten metal. Figure 1 As shown, molten metal enters the sprue 3 from top to bottom through the pouring cup 2 and reaches the bottom of the cylindrical casting cavity 1. It then enters the cylindrical casting cavity 1 through the gating runner 6. When the casting height exceeds 1 meter, the molten metal flows from top to bottom, and the large potential energy is continuously converted into kinetic energy, and the flow velocity of the molten metal continuously increases. That is, the high-speed flowing molten metal will form a strong impact force. This impact force will directly act on the gating runner 6 and the wall of the cylindrical casting cavity 1, forming a strong erosion effect. This causes the non-metallic refractory material on the gating runner 6 and the wall of the cylindrical casting cavity 1 to fall off and enter the molten metal, which can easily lead to slag inclusion defects in the casting.

[0003] In summary, the existing gating system for cylindrical castings cannot suppress the thermal erosion damage of molten metal to the gating system's runner 6 and the wall of the cylindrical casting cavity 1, resulting in technical defects such as slag inclusions after casting. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a stable flow gating system for cylindrical castings, which aims to solve the technical problem that the casting system cannot suppress the thermal erosion damage of the molten metal to the straight and horizontal runners of the gating system and the cavity wall of the cylindrical casting, resulting in slag inclusions after the casting is formed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a stable flow casting system for cylindrical castings, including a cylindrical casting cavity, a pouring cup, a sprue, and multiple runners. The top end of the sprue is connected to the pouring cup, and the bottom end of the sprue is connected to each runner. The multiple runners are arranged circumferentially along the cylindrical casting cavity, and each runner extends radially along the cylindrical casting cavity and is connected to the cylindrical casting cavity. Several flow stabilizers are provided on the sprue, each flow stabilizer including a flow stabilizing cavity, an inlet section, and an outlet section. The inlet section is located at the top of the flow stabilizing cavity, and the outlet section is located within the flow stabilizing cavity. At the bottom, both the inlet and outlet sections are connected to the direct casting channel, and both the inlet and outlet sections are coaxial with the direct casting channel. A flow stabilizing cylinder is installed inside the flow stabilizing cavity, extending along its own axis. An annular cavity is formed between the outer wall of the flow stabilizing cylinder and the inner wall of the flow stabilizing cavity. The inner diameter of the annular cavity is larger than the inner diameter of the direct casting channel. The bottom end of the flow stabilizing cylinder is connected to the outlet section, and the top end of the flow stabilizing cylinder is closed. The inlet section is connected to the annular cavity. Multiple through holes are opened on the top of the outer peripheral wall of the flow stabilizing cylinder. The multiple through holes are spaced apart along the circumference of the flow stabilizing cylinder. The through holes connect the annular cavity and the outlet section.

[0006] In one alternative embodiment, the total area of ​​the plurality of through holes is greater than the cross-sectional area of ​​the direct-flow channel.

[0007] In one alternative embodiment, the top surface of the flow stabilizer cylinder is configured as a conical surface.

[0008] In one alternative embodiment, the taper of the conical surface ranges from 15° to 75°.

[0009] In one alternative embodiment, the cross-section of the flow stabilizer is smaller than the cross-section of the direct casting channel.

[0010] In one alternative embodiment, multiple flow stabilizers are provided, and the multiple flow stabilizers are arranged at equal or non-equal intervals along the axial direction of the direct casting channel.

[0011] In one optional embodiment, a plurality of flow stabilizers divide the direct casting channel into multiple sub-direct flow channels, each sub-direct flow channel having a height range of 500mm to 1500mm.

[0012] In one optional embodiment, a transition cavity is provided at the bottom of the direct pouring channel, and the direct pouring channel is connected to each horizontal pouring channel through the transition cavity. The inner diameter of the transition cavity is larger than the inner diameter of the direct pouring channel and the inner diameter of the horizontal pouring channel.

[0013] In one alternative embodiment, a plurality of through holes are evenly spaced along the circumferential direction of the flow-stabilizing cylinder.

[0014] In one alternative embodiment, the through hole is a round hole, an elliptical hole, or a rectangular hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In use, the flow-stabilizing casting system for cylindrical castings of this invention features a flow-stabilizing component on the direct casting channel. This component includes a flow-stabilizing cavity, an inlet section, and an outlet section. The inlet section is located at the top of the flow-stabilizing cavity, and the outlet section is located at the bottom. Both the inlet and outlet sections are connected to the direct casting channel and are coaxial with it. A flow-stabilizing cylinder extending axially is installed within the flow-stabilizing cavity. An annular cavity is formed between the outer wall of the flow-stabilizing cylinder and the inner wall of the flow-stabilizing cavity. The inner diameter of the annular cavity is larger than the inner diameter of the direct casting channel. The bottom of the flow-stabilizing cylinder is connected to the outlet section, and the top of the flow-stabilizing cylinder is sealed. The inlet section is connected to the annular cavity. Multiple through holes are provided on the top of the outer peripheral wall of the flow stabilizing cylinder. These through holes are spaced apart along the circumference of the flow stabilizing cylinder and connect the annular cavity and the outlet section. Therefore, when the molten metal enters the annular cavity from top to bottom through the inlet section for expansion and buffering, it is then diverted into the outlet section through the multiple through holes on the top of the outer peripheral wall of the flow stabilizing cylinder. This achieves the dispersion of the kinetic energy of the molten metal and the gradual attenuation of the flow velocity, thereby effectively suppressing the thermal erosion damage of the molten metal to the straight and horizontal runners of the gating system and the cavity wall of the cylindrical casting. This effectively avoids the defects of slag inclusions after casting and improves the casting effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the casting system involved in the background art of this invention; Figure 2 This is a schematic diagram of the steady-flow casting system involved in this embodiment; Figure 3 for Figure 2 Top view; Figure 4 This is a cross-sectional view of the flow stabilizer involved in this embodiment.

[0017] Numbers in the attached drawings: 1. Cylindrical casting cavity; 2. Pour cup; 3. Straight runner; 30. Sub-straight runner; 4. Flow stabilizer; 40. Flow stabilizer cavity; 401. Annular cavity; 41. Inlet section; 42. Outlet section; 43. Flow stabilizer cylinder; 430. Through hole; 44. Positioning step; 45. Conical surface; 5. Transition cavity; 6. Horizontal runner. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0020] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, it should be noted that in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] During gravity casting of large cylindrical castings, due to the large height of the casting and the significant potential energy difference of the sprue 3, the molten metal forms a high-speed jet at the bottom under continuous acceleration, which causes strong thermal erosion on the inlet of the sprue 6 and the wall of the cylindrical casting cavity 1. This causes the non-metallic refractory material on the sprue 6 and the wall of the cylindrical casting cavity 1 to fall off and enter the molten metal, ultimately forming defects such as inclusions and surface roughness on the casting.

[0022] Therefore, this invention proposes a steady-flow casting system for cylindrical castings.

[0023] Please refer to Figures 2-4 The stable flow casting system of the present invention includes a cylindrical casting cavity 1, a pouring cup 2, a direct pouring channel 3, a flow stabilizer 4, a transition cavity 5, and multiple horizontal runners 6.

[0024] Please refer to Figures 2-4 The direct gating channel 3 extends vertically, and its top end is connected to the pouring cup 2. The bottom end of the direct gating channel 3 is connected to each of the horizontal gating channels 6. Multiple horizontal gating channels 6 are arranged circumferentially along the cylindrical casting cavity 1. Each horizontal gating channel 6 extends radially along the cylindrical casting cavity 1, and each horizontal gating channel 6 is connected to the cylindrical casting cavity 1.

[0025] Specifically, a transition cavity 5 is provided at the bottom of the sprue 3. The bottom of the sprue 3 is connected to each runner 6 through the transition cavity 5, and the inner diameter of the transition cavity 5 is larger than the inner diameter of the sprue 3 and the inner diameter of the runner 6. It can be understood that because the inner diameter of the transition cavity 5 is larger than the inner diameter of the sprue 3 and the inner diameter of the runner 6, the flow rate of the molten metal decreases after entering the transition cavity 5. Then, it flows evenly into the cylindrical casting cavity 1 through multiple circumferentially distributed runner 6 inlets, so that multiple circumferential areas of the cylindrical casting are filled synchronously and evenly, improving the pouring effect of the cylindrical casting, while significantly reducing the thermal erosion effect of the molten metal on the inlets of the runner 6.

[0026] The connection between the straight pouring channel 3 and each horizontal pouring channel 6 through the transition cavity 5 means that the bottom opening of the straight pouring channel 3 extends into the upper area of ​​the transition cavity 5, and each horizontal pouring channel 6 is connected from the side wall of the transition cavity 5 in the circumferential direction. The connection position is located within the space of the transition cavity 5, rather than directly connecting to the outer wall of the straight pouring channel 3. The inlet end face of each horizontal pouring channel 6 is flush with the inner wall of the transition cavity 5 to eliminate the step at the connection between the horizontal pouring channels 6.

[0027] The number of horizontal runners 6 is 4 to 8. In this embodiment, there are 4 horizontal runners 6, which are evenly distributed around the circumference of the cylindrical casting. In other embodiments, there may also be 8 horizontal runners 6. When the horizontal runners 6 are arranged non-uniformly, the spacing between the horizontal runners 6 is adjusted adaptively according to the change in the casting wall thickness. For example, the number of horizontal runners 6 can be reduced in thin-walled areas, but all horizontal runners 6 must be fluidly connected through the same transition cavity 5.

[0028] Based on the above structure, several flow stabilizers 4 are provided on the direct casting channel 3.

[0029] Please refer to Figure 2 and Figure 4 The flow stabilizer 4 includes a flow stabilizer cavity 40, an inlet section 41, and an outlet section 42. The inlet section 41 is located at the top of the flow stabilizer cavity 40, and the outlet section 42 is located at the bottom of the flow stabilizer cavity 40. Both the inlet section 41 and the outlet section 42 are connected to the direct casting channel 3, and both the inlet section 41 and the outlet section 42 are coaxial with the direct casting channel 3. A flow stabilizer cylinder 43 extending along its own axial direction is provided inside the flow stabilizer cavity 40. The flow stabilizer cylinder 43 is coaxial with the inlet section 41 or the outlet section 42.

[0030] In addition, please refer to Figure 2 and Figure 4An annular cavity 401 is formed between the outer wall of the flow stabilizer cylinder 43 and the inner wall of the flow stabilizer cavity 40. The inner diameter of the annular cavity 401 is larger than the inner diameter of the direct casting channel 3. The bottom end of the flow stabilizer cylinder 43 is connected to the outlet section 42, and the top end of the flow stabilizer cylinder 43 is closed. The inlet section 41 is connected to the annular cavity 401. Multiple through holes 430 are provided on the top of the outer peripheral wall of the flow stabilizer cylinder 43. The multiple through holes 430 are spaced apart along the circumference of the flow stabilizer cylinder 43. The through holes 430 connect the annular cavity 401 and the outlet section 42. In summary, the molten metal introduced by the pouring cup 2 first enters the straight runner 3 and accelerates downward under the action of gravity. When the molten metal reaches the flow stabilizer 4, it enters the annular cavity 401 from the inlet section 41 for expansion and buffering, and then flows into the outlet section 42 through multiple through holes 430 on the top of the outer peripheral wall of the flow stabilizer 43. This achieves the dispersion of the kinetic energy of the molten metal and the gradual decrease of the flow rate, thereby effectively suppressing the thermal erosion damage of the molten metal to the straight and horizontal runners 6 of the gating system and the wall of the cylindrical casting cavity 1, and thus effectively avoiding the defects of slag inclusions after the casting is formed.

[0031] It should be noted that the flow diversion between the annular cavity 401 and the multiple circumferential through holes 430 on the flow stabilizer 401 creates a dual flow stabilization effect, which decomposes the kinetic energy of the high-potential molten metal step by step. This prevents the high-speed flowing molten metal from generating a strong impact force on the walls of the horizontal runner 6 and the cylindrical casting cavity 1, thus avoiding strong erosion of the walls of the horizontal runner 6 and the cylindrical casting cavity 1. This effectively achieves stable filling of the mold with molten metal and ensures the quality of the casting.

[0032] In a simulated scenario, a large cylindrical casting has an outer diameter of 1600 mm, an inner diameter of 1200 mm, and a height of 4000 mm. The casting material is ductile iron QT400-18, with a mass of approximately 26750 kg. The pouring temperature is 1400℃, and the pouring time is 200 s. Simulation data for this large cylindrical casting shows that without flow stabilizers 4 on the sprue 3, the maximum transient velocity at the inlet of the gating sprue 6 is 11.69 m / s. However, after installing two flow stabilizers 4 on the sprue 3, the velocity drops from 11.69 m / s to 7.685 m / s, a decrease of 34.26%. Therefore, by setting a flow stabilizer 4 on the straight runner 3, and utilizing the flow diversion mechanism of the annular cavity 401 and multiple through holes 430 inside the flow stabilizer 4, the thermal erosion damage of the high-temperature and high-speed molten metal to the horizontal runner 6 and the wall of the cylindrical casting cavity 1 is effectively suppressed, thus avoiding slag inclusion defects after the casting is formed.

[0033] It should be noted that after the molten metal enters the sprue 3 from the gate, it will accelerate due to gravity, with the flow speed increasing and the impact force becoming stronger as it flows downwards. If only one flow stabilizer 4 is set, it can only reduce the flow velocity locally. The uncovered area below will be subjected to high-speed impact, which will exacerbate the thermal erosion of the sprue wall, the inlet of the horizontal runner 6, and the wall of the cylindrical casting cavity 1. Therefore, this embodiment has multiple flow stabilizers 4. In this way, during the pouring process, the high-temperature molten metal passes through each flow stabilizer 4 sequentially from top to bottom. Because the multiple flow stabilizers 4 are arranged in segments along the axial direction, the molten metal undergoes a flow velocity suppression and flow direction realignment every time it passes through a joint, avoiding the problem of secondary acceleration caused by the long acceleration section after the molten metal has been stabilized by a single flow stabilizer 4.

[0034] Please refer to Figure 4 Multiple flow stabilizers 4 divide the direct-flow channel 3 into multiple sub-direct-flow channels 30, each with a height ranging from 500mm to 1500mm. That is, it can be understood that when the height of a sub-direct-flow channel 30 is less than 500mm, although the flow rate of the molten metal can be further reduced, the number of flow stabilizers 4 also increases significantly; when the height of a sub-direct-flow channel 30 is greater than 1500mm, the acceleration time of the molten metal in a single sub-direct-flow channel 30 is too long, causing a secondary acceleration problem. In this embodiment, the height of each sub-direct-flow channel 30 is 500mm; in other embodiments, the height of each sub-direct-flow channel 30 can also be 1500mm, 800mm, or 1000mm. For example, when the total length of the direct-flow channel 3 is 2000mm and four flow stabilizers 4 are arranged, the height of each sub-direct-flow channel 30 is 500mm.

[0035] In this embodiment, multiple flow stabilizers 4 are arranged at equal intervals along the axial direction of the direct casting channel 3, which is equivalent to segmenting and controlling the direct casting channel 3. Each flow stabilizer 4 plays the role of deceleration and flow stabilization. The flow rate of the molten metal in each sub-direct flow channel 30 is uniformly controlled within a reasonable range to avoid excessively high or low flow rates in a certain section, and to ensure that the flow rate of the molten metal decreases uniformly as it passes through each sub-direct flow channel 30.

[0036] Additionally, refer to Figure 2 The equidistant flow stabilizers 4 allow the pressure in the direct pouring channel 3 to be evenly distributed along the axial direction, thereby ensuring that the flow rate and pressure of the molten metal at the inlet of each horizontal sprue 6 are consistent. This allows the cylindrical casting cavity 1 to be evenly filled, avoiding problems such as local erosion and insufficient filling, and improving the casting effect.

[0037] Of course, in other embodiments, multiple flow stabilizers 4 may also be arranged in a non-equidistant manner along the axial direction of the direct casting channel 3. This is not limited here. For those skilled in the art, by reasonably setting the arrangement of the flow stabilizers 4, it should also fall within the protection scope of this invention.

[0038] In addition, refer to Figure 4 The inlet section 41 and outlet section 4 of the current stabilizer 4 are provided with positioning steps 44, which are used to position the end face of the sub-DC channel 30, which is beneficial to the connection between the current stabilizer 4 and the sub-DC channel 30.

[0039] The total area of ​​the multiple through holes 430 is larger than the horizontal cross-sectional area of ​​the direct-flow channel 3, enabling the molten metal to expand and divert during the transition from the annular cavity 401 to the outlet section 42 within the flow stabilizer 4. This avoids a sudden increase in flow velocity, aggravated pressure fluctuations, and unstable liquid flow caused by local throttling, thereby enhancing the flow stabilizer 4's ability to disperse the kinetic energy of the high-speed molten metal. It should be noted that the total area of ​​the multiple through holes 430 refers to the sum of the projected areas of all through holes 430 on the plane perpendicular to the axis of the flow stabilizer cylinder 43.

[0040] Since the annular cavity 401 of the flow stabilizer 4 and the through holes 430 on the flow stabilizer cylinder 43 play the roles of buffering and rectifying, if the total flow area of ​​the through holes 430 is smaller than the cross-sectional area of ​​the direct gating channel 3, the flow of molten metal through the through holes 430 will be greatly restricted, resulting in molten metal stagnation and pressure accumulation in the direct gating channel 3, and at the same time, the molten metal supply speed of the horizontal gating channel 6 will decrease. However, if the total area of ​​the through holes 430 is larger than the cross-sectional area of ​​the direct gating channel 3, it can ensure that the flow capacity of molten metal through the flow stabilizer 4 is not lower than the conveying capacity of the direct gating channel 3, achieving the effect of stabilizing the flow without obstructing the flow, thereby meeting the needs of rapid and continuous filling of the cylindrical casting cavity 1 and preventing the pouring effect from being affected by insufficient liquid supply.

[0041] In addition, when the total flow area of ​​the through holes 430 is sufficient, the molten metal will not experience local high-speed impacts due to insufficient flow space when passing through the circumferentially distributed through holes 430. The molten metal can smoothly flow from the annular cavity 401 into the flow-stabilizing cylinder 43, resulting in a more uniform flow velocity distribution. This avoids local turbulence caused by flow restriction due to the through holes 430, reduces the possibility of air entrapment and slag inclusion, and ensures that the pressure of the molten metal flowing into each horizontal gating channel 6 is consistent, thereby improving the uniformity of circumferential filling of the cylindrical casting.

[0042] For example, if the inner diameter of the direct casting channel is Φ180 mm, then its cross-sectional area is 25447 mm². If the total number of through holes 430 is set to 24, and each hole is a Φ8 mm round hole, the total area is 24×π×(4)² = 12064 mm², which does not meet the requirements. Therefore, it is adjusted to 36 Φ10 mm round holes, and the total area is 36×π×(5)² = 28274 mm², which exceeds the cross-sectional area of ​​the direct casting channel of 28274 mm².

[0043] Of course, the total area of ​​all through holes 430 is slightly larger than the cross-sectional area of ​​the direct casting channel. For example, the total area of ​​through holes 430 exceeds the cross-sectional area of ​​the direct casting channel by 10% to 30%. In this way, after the molten metal enters the annular cavity 401 from the inlet section 41, it is sufficiently buffered and decelerated, and then smoothly flows into the outlet section 42 through the multiple evenly distributed through holes 430. If the excess is too large, such as greater than 50%, the residence time of the molten metal in the annular cavity 401 will be shortened, weakening its kinetic energy dissipation function.

[0044] Reference Figure 4 In this embodiment, multiple through holes 430 are evenly spaced along the circumference of the flow stabilizer body 43, and the central axis of the through holes 430 is perpendicular to the outer wall surface of the flow stabilizer body 43. The multiple through holes 430 evenly arranged along the circumference of the flow stabilizer body 43 can make the molten metal transition evenly to the outlet section 42 along the circumference of the flow stabilizer body 43.

[0045] Reference Figure 4 The top surface of the flow stabilizer 43 is designed as a conical surface 45. If the top surface of the flow stabilizer 43 were flat, when the molten metal enters the annular cavity from the inlet section, it is easy to form local accumulation and eddies at the top surface of the flow stabilizer 43. After the molten metal impacts the flat surface, it will bounce around, causing splashing. The conical surface structure can guide the molten metal, change the contact mode between the molten metal and the top of the flow stabilizer 43, thereby suppressing energy dissipation instability caused by vertical impact and effectively avoiding splashing of the molten metal. It can be seen that the flow guide of the conical surface 45 reduces the local flow velocity, avoids vertical impact on the flat top surface, alleviates splashing caused by the instability of the liquid flow, and allows the molten metal to slide smoothly down the conical surface into the annular cavity 401.

[0046] The taper of the conical surface 45 ranges from 15° to 75°, ensuring that the liquid flows smoothly down the conical surface under gravity and accelerates its circumferential diffusion into the annular cavity 401; in this embodiment, the taper of the conical surface 45 is 35°. Of course, in other embodiments, the taper of the conical surface can also be 15° or 75°. Reference Figure 4 The horizontal cross-section of the flow stabilizer cylinder 43 is smaller than the horizontal cross-section of the direct pouring channel 3, which ensures that the annular cavity has a sufficiently large horizontal cross-sectional area to accommodate and buffer the high-speed falling molten metal. In summary, since the flow rate of the molten metal in each sub-channel 30 is controllable, the liquid flow entering the stabilizing cavity 40 can be fully expanded and then undergoes secondary rectification through the annular cavity expansion, the through hole 430 diversion, the conical surface guidance, and the central channel of the stabilizing cylinder 43. Finally, it smoothly merges into the transition cavity 5 in a low-disturbance and low-shear state, avoiding the scouring of the horizontal runner 6 inlet by the high-speed liquid flow, alleviating thermal erosion, and improving the uniformity of filling the cylindrical casting cavity 1.

[0047] Working principle of the invention: In the pouring process of the present invention, the molten metal enters the upper section of the straight pouring channel 3 from the pouring cup 2 and flows into the inlet section 41 of the flow stabilizer 4. Under the guidance of the top conical surface of the flow stabilizer cylinder 43, it enters the annular cavity 401 for expansion and buffering along the circumference. Then, it is diverted through multiple through holes 430 on the flow stabilizer cylinder 43 into the outlet section 42, realizing the dispersion of kinetic energy and the gradual attenuation of flow velocity. After that, it enters the transition cavity 5 for further buffering. Then, it is evenly distributed to each horizontal sprue 6 along the circumference of the transition cavity 5, and finally enters the cylindrical casting cavity 1 for filling.

[0048] In summary, the present invention has the following beneficial effects: 1. The flow stabilizer 4 of the present invention has the functions of reducing speed, stabilizing pressure and equalizing flow, which effectively alleviates the thermal erosion and slag inclusion defects caused by the concentrated release of potential energy in the traditional bottom injection system.

[0049] 2. The flow stabilizer 4 of the present invention has the functions of expanding capacity, buffering, limiting flow and guiding flow, transforming the turbulent flow of molten metal into laminar flow, avoiding direct impact of high-speed molten metal on the wall of the cylindrical casting cavity 1, and reducing the probability of air entrapment during the flow of molten metal, thus reducing the porosity inside the casting.

[0050] 3. Multiple horizontal runners 6 are distributed around the circumference of the cylindrical casting cavity 1, while the flow stabilizer 4 can ensure that the flow rate and pressure of the molten metal flowing into the bottom of the straight runner 3 are uniform and stable. Compared with the gating system without the flow stabilizer 4, the speed and time consistency of the molten metal entering each horizontal runner 6 are stronger, realizing synchronous filling of the cylindrical casting cavity 1 around the circumference, avoiding excessively fast or slow filling in local areas, and is suitable for cylindrical castings with strict wall thickness requirements.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A steady-flow gating system for a cylindrical casting, comprising a cylindrical casting cavity, a pouring cup, a sprue, and multiple runners, wherein the top end of the sprue is connected to the pouring cup, the bottom end of the sprue is connected to each runner, the multiple runners are arranged circumferentially along the cylindrical casting cavity, each runner extends radially along the cylindrical casting cavity, and each runner is connected to the cylindrical casting cavity; characterized in that, The direct casting channel is provided with several flow stabilizers, each including a flow stabilizing cavity, an inlet section, and an outlet section. The inlet section is located at the top of the flow stabilizing cavity, and the outlet section is located at the bottom of the flow stabilizing cavity. Both the inlet and outlet sections are connected to the direct casting channel and are coaxial with it. The flow stabilizing cavity contains a flow stabilizing cylinder along its own axial direction. An annular cavity is formed between the outer wall of the flow stabilizing cylinder and the inner wall of the flow stabilizing cavity. The inner diameter of the annular cavity is larger than the inner diameter of the direct casting channel. The bottom of the flow stabilizing cylinder is connected to the outlet section, and the top of the flow stabilizing cylinder is closed. The inlet section is connected to the annular cavity. Multiple through holes are provided on the top of the outer peripheral wall of the flow stabilizing cylinder. The multiple through holes are spaced apart along the circumference of the flow stabilizing cylinder and connect the annular cavity and the outlet section.

2. The stable flow casting system for cylindrical castings according to claim 1, characterized in that, The total area of ​​the plurality of through holes is greater than the cross-sectional area of ​​the direct casting channel.

3. The stable flow casting system for cylindrical castings according to claim 1, characterized in that, The top surface of the flow stabilizer cylinder is set as a cone.

4. The steady-flow casting system for cylindrical castings according to claim 3, characterized in that, The taper of the cone surface ranges from 15° to 75°.

5. The steady-flow casting system for cylindrical castings according to claim 1, characterized in that, The cross-section of the flow stabilizer cylinder is smaller than the cross-section of the direct casting channel.

6. The steady-flow casting system for cylindrical castings according to claim 1, characterized in that, Multiple flow stabilizers are provided, and these multiple flow stabilizers are arranged at equal or non-equal intervals along the axial direction of the direct casting channel.

7. The steady-flow casting system for cylindrical castings according to claim 6, characterized in that, Multiple flow stabilizers divide the direct casting channel into multiple sub-direct flow channels, each sub-direct flow channel having a height range of 500mm to 1500mm.

8. The stable flow casting system for cylindrical castings according to claim 1, characterized in that, The bottom end of the direct pouring channel is provided with a transition cavity, through which the direct pouring channel is connected to each horizontal pouring channel. The inner diameter of the transition cavity is larger than the inner diameter of the direct pouring channel and the inner diameter of the horizontal pouring channel.

9. The steady-flow casting system for cylindrical castings according to claim 1, characterized in that, The multiple through holes are evenly spaced along the circumferential direction of the flow-stabilizing cylinder.

10. A steady-flow gating system for cylindrical castings according to claim 1 or 9, characterized in that, The through hole can be a round hole, an elliptical hole, or a square hole.

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