Pouring method for directional solidification crystallization furnace and splash-proof bushing

Abstract

The invention discloses a pouring method for a directional solidification crystallization furnace and a splash-proof lining, and belongs to the technical field of investment precision casting.The method comprises the steps that when the vacuum degree of a feeding chamber meets the technological requirement, cleaned mother alloy is added into a smelting chamber crucible through the feeding chamber; a filter screen is arranged in a clamping groove of the mold shell, a splash-proof lining is placed on a pouring cup of the mold shell, then the mold shell is placed on a crystallizer, and a furnace door is closed; the shell is heated and subjected to heat preservation according to a heating curve specified by the process; after the vacuum degree of the smelting chamber reaches the standard, the master alloy is melted at the maximum power, and the temperature is increased to the overheating temperature; inserting a thermocouple into the metal liquid level to measure the temperature; tilting the crucible for pouring; after standing according to the technological procedure, controlling the drawing speed and the drawing time to move down the shell; and heating is stopped, the shell is taken out, and the splash-proof lining is taken down. The stability of the flow guiding and pouring process of the molten metal is optimized, the risk that the molten metal is splashed to damage a furnace body is reduced, the quality and efficiency of a casting are improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of investment precision casting, and particularly relates to a method for pouring a directional solidification crystallizer and a splash-proof bushing. Background Art

[0002] In the process of investment precision casting, the equipment used for directional and single-crystal superalloy castings is usually a directional solidification crystallizer. During the pouring process of directional and single-crystal superalloy castings, the molten metal melted in the crucible needs to be poured into the cavity of the high-temperature shell mold. At present, during the pouring process of the directional solidification crystallizer, the following problems often occur: the flow length of the molten metal is too long or too short, and it cannot be aligned with the sprue cup of the shell mold, resulting in the molten metal splashing onto the furnace wall, heater, and heat-insulating carbon felt, causing equipment failures. Therefore, to sum up, during the pouring process of the directional solidification crystallizer at present, due to the too long or too short flow length of the molten metal, the molten metal may not be aligned with the sprue cup of the shell mold, so that the molten metal may splash onto the furnace wall, heater, or heat-insulating carbon felt, causing equipment failures. Summary of the Invention

[0003] The present invention provides a method for pouring a directional solidification crystallizer and a splash-proof bushing, aiming to solve the problem that during the pouring process of the directional solidification crystallizer at present, due to the too long or too short flow length of the molten metal, the molten metal may not be aligned with the sprue cup of the shell mold, so that the molten metal may splash onto the furnace wall, heater, or heat-insulating carbon felt, causing equipment failures.

[0004] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a method for pouring a directional solidification crystallizer, including the following steps: S1. When the vacuum degree of the charging chamber reaches the process requirement, add the cleaned master alloy into the crucible in the melting chamber through the charging chamber; S2. Install the filter screen in the shell mold slot, place the splash-proof bushing on the sprue cup of the shell mold, then place the shell mold on the crystallizer and close the furnace door; S3. Heat and keep the shell mold warm according to the heating curve specified by the process; S4. After the vacuum degree of the melting chamber meets the standard, melt the master alloy at the maximum power and raise the temperature to the superheat temperature; S5. Insert the thermocouple into the position one-third to one-half below the molten metal surface to measure the temperature; S6. Tilt the crucible for pouring; S7. After standing according to the process regulations, control the pulling speed and pulling time to move the shell mold downward; S8. Stop heating and take out the shell mold, and remove the splash-proof bushing.

[0005] In some embodiments, in S2, the size of the splash guard sleeve placed on the mold shell pouring cup is adapted to the diameter of the mold, and the thickness of the splash guard sleeve is uniform.

[0006] Further, in S2, the splash guard sleeve is made of high-purity, high-strength, and high-density graphite material.

[0007] Further, in S2, the part of the splash guard sleeve corresponding to the opening of the mold shell pouring cup matches the shape of the opening of the mold shell pouring cup.

[0008] Further, in S2, the total height of the splash guard sleeve is set according to the size of the mold.

[0009] In some embodiments, in S3, the heating curve specified by the process includes: the upper zone temperature control stage of the mold shell, the lower zone temperature control stage of the mold shell, and the heat preservation stage.

[0010] In some embodiments, in S4, after melting the master alloy at the maximum power and raising the temperature, the molten metal needs to be refined to the specified temperature.

[0011] In some embodiments, in S6, before tilting the crucible for pouring, it is necessary to check the temperature of the molten metal, the slag floating level, and the vacuum degree of the melting chamber.

[0012] In some embodiments, in S7, when lowering the mold shell, the pulling speed and pulling time are set according to the height of the mold shell and the process requirements.

[0013] The present invention also provides a splash guard sleeve for pouring in a directional solidification crystallizer furnace. The splash guard sleeve for pouring in a directional solidification crystallizer furnace is the splash guard sleeve used in the above-mentioned method for pouring in a directional solidification crystallizer furnace; the size of the splash guard sleeve is adapted to the diameter of the mold; the thickness of the splash guard sleeve is uniform; the splash guard sleeve is made of high-purity, high-strength, and high-density graphite material; the part of the splash guard sleeve corresponding to the opening of the mold shell pouring cup matches the shape of the opening of the mold shell pouring cup; the total height of the splash guard sleeve is set according to the size of the mold; The splash guard sleeve is of a cylindrical structure, and the cylindrical structure includes a straight cylinder section and a necking section connected in sequence from top to bottom. The radial dimension of the necking section gradually decreases along the direction from top to bottom, and an extension part is formed at the outer edge of the cylindrical structure at one end of the straight cylinder section far from the necking section.

[0014] Compared with the prior art, the method and splash guard sleeve for pouring in a directional solidification crystallizer furnace of the present invention have the following beneficial effects: A method for pouring in a directional solidification crystallization furnace according to the present invention includes vacuum control, installation of a splash-proof bushing, heating curve, melting parameters, temperature measurement, pouring operation, and pulling logic. By systematically controlling the pouring process and controlling the vacuum degree, temperature, pouring timing, and pulling parameters in stages, it ensures that the molten metal accurately flows into the mold shell, avoiding splash problems caused by too long or too short processes. The installation of the splash-proof bushing directly intercepts the splashing molten metal, protects the integrity of components such as the furnace body heater and thermal insulation carbon felt in the solidification crystallization furnace, and reduces the risk of equipment loss. It can be applicable to the process requirements and process regulations in this field, ensuring that the method can be adapted to different alloys and mold shell specifications. Through the synergistic effect of the splash-proof bushing and process control, the present invention improves the problems of molten metal splashing and equipment damage.

[0015] On the other hand, a splash-proof bushing for pouring in a directional solidification crystallization furnace according to the present invention is adapted to the crystallizer diameter, with uniform thickness, made of high-purity, high-strength, and high-temperature-resistant graphite material, matched with the pouring cup, and the total height is adapted. The splash-proof bushing has the dual functions of guiding and preventing splashing. The converging section can guide the molten metal to flow into the pouring cup concentratedly, reducing splashing; the extension part can expand the contact area between the bushing and the pouring cup, enhancing the installation stability. The cylindrical structure design allows uniform expansion at high temperatures, avoiding seal failure caused by deformation. This splash-proof bushing can be adapted to different sizes of crystallizers, and the high-purity, high-strength, and high-temperature-resistant graphite material extends the service life of the bushing. Through the structural optimization and material selection of the splash-proof bushing, the common improvement of splash prevention, flow guiding, and installation stability is achieved, which has better practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings in the specification are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention.

[0017] Figure 1 It is a schematic structural diagram of a splash-proof bushing for pouring in a directional solidification crystallization furnace according to the present invention; Figure 2 It is a schematic structural diagram of a splash-proof bushing for pouring in a directional solidification crystallization furnace in an embodiment of the present invention.

[0018] Reference numerals; Among them, 1, straight barrel section, 2, converging section, 3, extension part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0023] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0024] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] How to ensure that the molten metal accurately flows into the mold shell during the pouring process of the directional solidification crystallization furnace, avoid splashing problems caused by too long or too short flow paths, protect the integrity of components such as the furnace body heater and the heat preservation carbon felt in the solidification crystallization furnace, and reduce the risk of equipment loss.

[0026] Based on this, the present invention provides a method for pouring a directional solidification crystallization furnace, including the following steps: S1. When the vacuum degree in the feeding chamber reaches the process requirement, add the cleaned master alloy into the crucible in the melting chamber through the feeding chamber; S2. Install the filter screen into the slot of the mold shell, place the splash-proof bushing on the sprue cup of the mold shell, then place the mold shell on the crystallizer and close the furnace door; S3. Heat and keep the mold shell warm according to the heating curve specified by the process; S4. After the vacuum degree in the melting chamber meets the standard, melt the master alloy at the maximum power and raise the temperature to the superheat temperature; S5. Insert the thermocouple into the position one-third to one-half downward from the metal liquid surface to measure the temperature; S6. Tilt the crucible for pouring; S7. After standing according to the process regulations, control the pulling speed and pulling time to move the mold shell downward; S8. Stop heating and take out the mold shell, and remove the splash-proof bushing.

[0027] A method for pouring a directional solidification crystallizer according to the present invention solves the problems of furnace body damage of the directional solidification crystallizer caused by metal liquid splashing, process deviation, etc. during the pouring process of the directional solidification crystallizer as a whole by controlling operations such as vacuum degree, heating curve, metal liquid melting, and pouring in stages, and combining the installation and use of the splash-proof bushing, ensuring that the metal liquid can accurately flow into the sprue cup of the mold shell, while reducing the failure rate of the overall equipment and improving the quality of the casting and the stability of the process.

[0028] On the basis of the above, the present invention also provides a splash-proof bushing for pouring a directional solidification crystallizer, and the splash-proof bushing is the splash-proof bushing adopted by the above method for pouring a directional solidification crystallizer; wherein: The size of the splash-proof bushing is adapted to the diameter of the crystallizer; the thickness of the splash-proof bushing is uniform; the splash-proof bushing is made of high-purity graphite material; the part of the splash-proof bushing corresponding to the opening of the mold shell sprue cup matches the shape of the opening of the mold shell sprue cup; the total height of the splash-proof bushing is set according to the size of the crystallizer; As Figure 1 shown, the splash-proof bushing of the present invention is a cylindrical structure, and the cylindrical structure includes a straight cylinder section 1 and a reduced diameter section 2 connected in sequence from top to bottom. The radial dimension of the reduced diameter section 2 gradually decreases along the top-down direction. An extension part 3 is formed on the outer edge of the cylindrical structure at one end of the straight cylinder section 1 far from the reduced diameter section 2. That is, the upper end of the cylindrical structure has a flanging, which can further reduce the sputtering problem that may be caused by the metal liquid entering the opening part of the mold shell sprue cup. The splash-proof bushing suitable for pouring the directional solidification crystallizer provided by the present invention can accurately pour the metal liquid in the crucible into the mold shell, thereby improving the quality of the casting to a certain extent and reducing the loss or damage of the equipment.

[0029] In some embodiments, the splash-proof bushing of the present invention is sized to match the diameter of the mold and has a uniform thickness. It can accommodate molds with diameters of, for example, 200 mm or 400 mm, without requiring additional customization, thereby reducing production costs and ensuring uniform stress on the bushing at high temperatures, thereby avoiding the risk of cracking due to uneven thermal stress. The splash-proof bushing can be made of high-density graphite, which has high thermal conductivity and can quickly dissipate heat, reducing the temperature differential stress between the molten metal and the bushing. It also does not react with the molten metal, preventing impurities from contaminating the molten alloy.

[0030] Furthermore, the lower end of the splash guard bushing of the present invention matches the shape of the mold shell pouring cup opening, ensuring that the molten metal flows directly into the mold shell, avoiding splashing caused by misalignment. The matching shape reduces molten metal overflow and improves pouring efficiency. In some actual working conditions, the total height of the splash guard bushing of the present invention is set according to the size of the crystallizer. The total height of the splash guard bushing is adapted to the crystallizer size and is suitable for mold shells of different heights (such as 350mm and 358mm), avoiding the bushing being too long or too short, which may affect installation stability.

[0031] In addition, the method for directional solidification crystallization furnace casting of the present invention adopts segmented control of the heating curve, which includes upper and lower zone temperature control and insulation stages. Staged heating avoids cracking of the mold shell due to sudden heating, achieves temperature gradient optimization, and ensures the stability of directional solidification of the molten metal.

[0032] Furthermore, the present invention requires refining to a specified temperature after smelting to remove impurities from the molten metal. Pre-pouring parameter checks include checking the molten metal temperature, dross level, and vacuum level. This improves casting quality, preemptively eliminating anomalies such as insufficient temperature and excessive dross, and ensuring a successful casting. Furthermore, in the present method, the withdrawal speed and time are set based on the mold height and process requirements. By adapting these parameters to a mold height of, for example, 350 mm, casting quality can be improved.

[0033] The method for pouring in a directional solidification crystallization furnace and the splash-proof bushing of the present invention are further described in detail below through specific embodiments.

[0034] The splash-proof bushing of the present invention is made of three-high graphite, which mainly refers to special graphite with high strength, high density and high purity. It has the characteristics of high thermal conductivity, good thermal stability and impact resistance, and does not react with molten metal liquid.

[0035] like Figure 1 and Figure 2As shown in the figure, the splash-proof bushing of the present invention needs to have a simple and practical shape, generally in the shape of a conical funnel. According to the diameters of 200 mm and 400 mm of the water-cooled copper disk crystallizer of the directional solidification crystallization furnace, two sizes of splash-proof bushings are designed. The specific dimensions of the splash-proof bushing applicable to the crystallizer with a diameter of 200 mm are as follows: the thickness is 8 mm, the upper end diameter is 140 mm, the lower end diameter is 88 mm, the total height is 103 mm, and the outer edge diameter is 240 mm. The specific dimensions of the splash-proof bushing applicable to the crystallizer with a diameter of 400 mm are as follows: the thickness is 8 mm, the upper end diameter is 140 mm, the lower end diameter is 88 mm, the total height is 213 mm, and the outer edge diameter is 240 mm.

[0036] The total height of the upper and lower zone heaters of the mold shell designed by the current directional solidification crystallization furnace is 500 mm. Generally, the height dimension of the general directional and single crystal mold shells (including the pouring cup) does not exceed 450 mm. The upper end diameter of the ceramic pouring cup of the mold shell is 140 mm. When using the splash-proof bushing, its lower end can be perfectly docked with the ceramic pouring cup of the mold shell. The splashed molten metal during the pouring process can adhere to the inside of the splash-proof bushing and will not damage the furnace body.

[0037] As a specific embodiment, the mold shell of a single crystal working blade with a diameter of 200 mm is poured; The master alloy material of the working blade is DD6. A combination of a crystallization chassis with a diameter of 200 mm is used, with five pieces in a group. The pouring weight is 6 KG, and the total height of the mold shell is 350 mm.

[0038] Charging; when the vacuum degree of the charging chamber reaches the process requirements, the cleaned 6 KG master alloy is added to the crucible in the melting chamber through the charging chamber, and the crucible should be avoided from being knocked; The mold shell is put into the furnace; first, the filter screen is installed in the card slot of the mold shell, then the splash-proof bushing for the crystallizer with a diameter of 200 mm is placed on the ceramic pouring cup of the mold shell, and finally the mold shell with a flat bottom is stably placed on the clean crystallizer, the furnace door is closed, and the casting chamber starts to evacuate.

[0039] Heating the mold shell; The mold shell is heated according to the mold shell heating curve specified in the process regulations. When the mold shell reaches the specified upper and lower zone temperatures, the mold shell starts to be insulated.

[0040] Alloy melting; When the vacuum degree of the melting chamber reaches the process requirements, the master alloy is melted at the maximum power to ensure that the molten metal does not splash. After the alloy ingot is melted clean, power is supplied at the heating power to raise the temperature of the molten metal to the specified superheat (refining) temperature in the regulations; Temperature measurement; After checking that the vacuum degree of the temperature measurement chamber, the temperatures of the upper and lower zone heaters meet the requirements, the thermocouple should be lowered to a position one-third to one-half below the molten metal surface to measure the temperature of the molten metal.

[0041] Pouring; Carry out tilting furnace slag skimming, check the molten metal temperature, dross grade, upper and lower zone temperatures, and the vacuum degree of the melting chamber. After meeting the requirements of the process specification, tilt the crucible for pouring.

[0042] Shell pulling; After pouring is completed, let it stand according to the regulations and then start pulling. Move the shell downward at the specified pulling speed and pulling time (or pulling height) according to the regulations.

[0043] Taking out of the furnace; After the pulling is completed, quickly move the shell downward to the bottom of the casting chamber. Stop the power supply of the two-zone heater to let its temperature drop. Close the isolation valve, break the vacuum in the casting chamber and take out the shell.

[0044] Remove the 200mm diameter splash guard for the mold from the sprue cup of the shell, and pour the next furnace of castings according to the above steps.

[0045] As a specific embodiment, pouring of a shell with a 400mm diameter for a certain directional guide vane; The mother alloy material of this directional vane is DZ40M, using a 400mm diameter crystal chassis combination, fourteen pieces in a group, pouring weight 11KG, and the total height of the shell is 358mm.

[0046] Charging; When the vacuum degree of the charging chamber reaches the process requirements, add 11KG of clean mother alloy into the melting chamber crucible through the charging chamber, and avoid bumping the crucible; Putting the shell into the furnace; First, install the filter screen into the slot of the shell, then place the 400mm diameter splash guard for the mold on the ceramic sprue cup of the shell, and finally place the shell with a flat bottom steadily on the clean mold. Close the furnace door and start evacuating the casting chamber.

[0047] Heating the shell; Heat the shell according to the shell heating curve specified in the process specification. When the shell reaches the specified upper and lower zone temperatures, the shell starts to be kept warm.

[0048] Alloy melting; When the vacuum degree of the melting chamber reaches the process requirements, melt the mother alloy with the maximum power to ensure that the molten metal does not splash. After the alloy ingot is melted clean, supply power at the heating power to raise the temperature of the molten metal to the specified superheat (refining) temperature in the regulations.

[0049] Temperature measurement; Check the vacuum degree of the temperature measurement chamber and the temperatures of the upper and lower zone heaters. After meeting the requirements, the thermocouple should descend to the position one-third to one-half below the molten metal surface to measure the molten metal temperature.

[0050] Pouring; Carry out tilting furnace slag avoidance, check the molten metal temperature, dross grade, upper and lower zone temperatures, and melting chamber vacuum degree. After meeting the requirements of the process specifications, tilt the crucible for pouring.

[0051] Pull the mold shell; After pouring is completed, start pulling after standing according to the regulations. Move the mold shell downward at the pulling speed and pulling time (or pulling height) required by the regulations.

[0052] Take out of the furnace; After the pulling is completed, quickly move the mold shell down to the bottom of the casting chamber. Stop the power supply of the double-zone heater to let its temperature drop. Close the isolation valve, break the vacuum in the casting chamber and take out the mold shell.

[0053] Remove the splash guard bushing for the mold with a diameter of 400mm from the sprue cup of the mold shell, and pour the next furnace of castings according to the above steps.

[0054] A method for pouring in a directional solidification crystallization furnace and a splash guard bushing according to the present invention. Two sizes of splash guard bushings designed for different specifications of molds are realized for universal installation through an adaptable structure, which not only meets the process requirements of molds with diameters of 200mm and 400mm, but also simplifies the operation process. While ensuring the quality of the castings, the failure rate of the equipment is reduced.

[0055] A method for pouring in a directional solidification crystallization furnace and a splash guard bushing according to the present invention. A conical funnel-shaped splash guard bushing made of high-purity graphite material, with its excellent thermal conductivity, thermal stability and impact resistance, effectively intercepts the splashing molten metal during pouring, solves the problem of molten metal splashing onto the furnace wall, heater and thermal insulation carbon felt, significantly reduces the failure rate of the equipment, and extends the service life of the key components of the equipment. The present invention ensures the stability of the molten metal from melting to pouring through the control of the vacuum degree, the regulation of the staged heating curve, the precise measurement of the molten metal temperature and the dynamic adjustment of the pulling parameters, ensures the diversion of the molten metal, and improves the quality and efficiency of the castings. And the present invention can, to a certain extent, eliminate the risk of damage to the furnace body caused by the splashing of molten metal in the directional solidification crystallization furnace and improve the service life of the equipment.

[0056] Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technical personnel in the industry can smoothly implement the present invention according to the instructions and the above description. Any equivalent changes made by slightly modifying and evolving the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for pouring in a directional solidification crystallization furnace, characterized in that It includes the following steps: S1. When the vacuum degree of the charging chamber reaches the process requirement, add the cleaned master alloy into the crucible in the melting chamber through the charging chamber; S2. Install the filter screen into the slot of the mold shell, place the splash-proof bushing on the pouring cup of the mold shell, then place the mold shell on the crystallizer and close the furnace door; S3. Heat and keep the mold shell warm according to the heating curve specified by the process; S4. After the vacuum degree of the melting chamber meets the standard, melt the master alloy at the maximum power and raise the temperature to the superheat temperature; S5. Insert the thermocouple into the part where the metal liquid surface is one-third to one-half downward to measure the temperature; S6. Tilt the crucible for pouring; S7. After standing according to the process regulations, control the pulling speed and pulling time to move the mold shell downward; S8. Stop heating and take out the mold shell, and remove the splash-proof bushing.

2. The method for pouring in a directional solidification crystallization furnace according to claim 1, characterized in that In the above S2, the size of the splash-proof bushing placed on the pouring cup of the mold shell is adapted to the diameter of the crystallizer, and the thickness of the splash-proof bushing is uniform.

3. The method for pouring in a directional solidification crystallization furnace according to claim 2, characterized in that, In the above S2, the splash-proof bushing is made of high-purity, high-strength and high-graphitization graphite material.

4. The method for pouring in a directional solidification crystallization furnace according to claim 2, characterized in that, In the above S2, the part of the splash-proof bushing corresponding to the opening of the pouring cup of the mold shell matches the shape of the opening of the pouring cup of the mold shell.

5. The method for pouring in a directional solidification crystallization furnace according to claim 2, characterized in that, In the above S2, the total height of the splash-proof bushing is set according to the size of the crystallizer.

6. The method for pouring in a directional solidification crystallization furnace according to claim 1, wherein, In the above S3, the heating curve specified by the process includes: the upper zone temperature control stage of the mold shell, the lower zone temperature control stage of the mold shell, and the heat preservation stage.

7. The method for pouring in a directional solidification crystallization furnace according to claim 1, characterized in that, In the above S4, after melting the master alloy at the maximum power and raising the temperature, the molten metal needs to be refined to the specified temperature.

8. The method for pouring in a directional solidification crystallization furnace according to claim 1, wherein In the above S6, before tilting the crucible for pouring, it is necessary to check the temperature of the molten metal, the scum level, and the vacuum degree of the melting chamber.

9. The method for pouring in a directional solidification crystallization furnace according to claim 1, characterized in that, In the above S7, during the downward movement of the mold shell, the pulling speed and pulling time are set according to the height of the mold shell and the process requirements.

10. A splash-proof bushing for pouring in a directional solidification crystallizer furnace, the splash-proof bushing is the splash-proof bushing used in the method for pouring in a directional solidification crystallizer furnace according to any one of claims 1-9, and is characterized in that: The size of the splash-proof bushing is adapted to the diameter of the crystallizer; the thickness of the splash-proof bushing is uniform; the splash-proof bushing is made of high-purity, high-strength and high-graphitization graphite material; the part of the splash-proof bushing corresponding to the opening of the pouring cup of the mold shell matches the shape of the opening of the pouring cup of the mold shell; the total height of the splash-proof bushing is set according to the size of the crystallizer; The shown splash-proof bushing is of a cylindrical structure, and the cylindrical structure includes a straight cylinder section (1) and a necking section (2) connected in sequence from top to bottom. The radial dimension of the necking section (2) gradually decreases along the direction from top to bottom, and an extension part (3) is formed on the outer edge of the cylindrical structure at one end of the straight cylinder section (1) far from the necking section (2).

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