MRE sealing ring pouring preparation mold and anisotropic sealing ring preparation method

Abstract

The invention discloses an MRE sealing ring pouring preparation mold and an anisotropic sealing ring preparation method, the MRE sealing ring pouring preparation mold comprises a mold and a magnetic field generation device, and the mold is arranged in a magnetic field generated by the magnetic field generation device; the die comprises a heat conduction pressing head, a heat conduction base, an outer diameter control die and an inner diameter control die, the outer diameter control die and the inner diameter control die are arranged on the heat conduction base, the inner diameter control die is arranged on an inner ring of the outer diameter control die in a sleeved mode, and the lower end of the heat conduction pressing head is arranged on the inner ring of the outer diameter control die and arranged at the upper end of the inner diameter control die. An outer ring of the inner diameter control die, an inner ring of the outer diameter control die, the top of the heat conduction base and the bottom of the heat conduction pressing head form a pouring inner cavity used for forming the anisotropic MRE sealing ring in a pouring mode. According to the invention, the magnetomechanical property of the MRE sealing ring can be improved; and disassembly and cleaning are convenient, the preparation efficiency is improved, and the forming effect of sealing ring preparation is guaranteed.

Description

Technical Field

[0001] The present invention specifically relates to a mold for casting and preparing an MRE sealing ring and a method for preparing an anisotropic sealing ring. Background Art

[0002] Hydraulic systems play a vital role in modern industry, and seals must maintain excellent sealing performance under harsh environments such as high pressure and high temperature. Traditional sealing materials such as rubber and polyurethane will have problems such as unadjustable sealing performance and poor adaptability (pressure fluctuations) under extreme conditions, leading to seal failure. In order to meet these challenges, magnetorheological elastomers (MRE) have been introduced into the sealing field as a smart material. They can change their own mechanical properties under the action of an external magnetic field and provide dynamic and adaptive sealing solutions. However, in the preparation of sealing rings, the existing mold design is complex, inconvenient to disassemble and demold, and magnetization cannot be added or the magnetic field distribution is uneven, resulting in unstable performance of MRE sealing rings. In addition, it is difficult for traditional molds to achieve the chain arrangement of ferromagnetic particles in MRE materials, which affects the magnetomechanical properties of the sealing ring. Therefore, there is an urgent need for an efficient and precise anisotropic MRE sealing ring preparation mold and method. Summary of the invention

[0003] The purpose of the present invention is to provide a mold for casting and preparing an MRE sealing ring and a method for preparing an anisotropic sealing ring, so as to improve the magnetomechanical properties of the MRE sealing ring; facilitate disassembly and cleaning, improve preparation efficiency, and ensure the molding effect of the sealing ring preparation.

[0004] The technical solution adopted by the present invention is: A mold for casting and preparing an MRE sealing ring, comprising a mold and a magnetic field generating device, wherein the mold is arranged in a magnetic field generated by the magnetic field generating device during operation; The mold includes a thermally conductive pressure head, a thermally conductive base, an outer diameter control mold and an inner diameter control mold. The outer diameter control mold and the inner diameter control mold are arranged on the thermally conductive base, the inner diameter control mold is sleeved on the inner ring of the outer diameter control mold, the lower end of the thermally conductive pressure head is arranged on the inner ring of the outer diameter control mold, and is arranged on the upper end of the inner diameter control mold. The outer ring of the inner diameter control mold, the inner ring of the outer diameter control mold, the top of the thermally conductive base and the bottom of the thermally conductive pressure head form a casting inner cavity for casting an anisotropic MRE sealing ring.

[0005] Preferably, the magnetic field generating device comprises an electromagnetic coil wound around the outer ring of the outer diameter control die.

[0006] Preferably, the thermal conductive pressure head includes a heat transfer pressure plate and an exhaust ring, the lower end of the heat transfer pressure plate and the exhaust ring are arranged on the inner ring of the outer diameter control mold, and the heat transfer pressure plate is arranged above the exhaust ring; wherein the thermal conductive pressure head is formed by the heat transfer pressure plate and the exhaust ring being bonded together, and can realize the molding, pressing and exhausting functions.

[0007] Preferably, the heat transfer plate is bonded to the exhaust ring.

[0008] Preferably, both the outer diameter control mold and the inner diameter control mold are positioned and connected to the heat conductive base via positioning pins.

[0009] Preferably, the heat transfer platen is provided with a central hole for exhaust and weight reduction; Preferably, the material of the thermally conductive pressure head and the material of the thermally conductive base are any one of 10# steel, electrical pure iron and silicon steel.

[0010] Preferably, the inner diameter control mold material is 304 stainless steel, copper or aluminum; The outer diameter control mold material is 304 stainless steel, copper or aluminum, and the surface is sprayed with insulating paint or insulated with FDMD high temperature resistant insulating paper as the winding coil skeleton.

[0011] Preferably, the bushing is arranged on the outer ring of the inner diameter control die and / or the inner ring of the outer diameter control die.

[0012] A method for preparing an anisotropic sealing ring using the MRE sealing ring casting preparation mold as described above comprises the following steps: Preheat the mold; Add ferromagnetic particles to the sealing ring casting material and mix them evenly to form MRE material, and inject the MRE material into the casting cavity of the mold; A uniform magnetic field is generated by a magnetic field generating device, and a certain strength of the magnetic field is maintained, so that the MRE material can be fully pre-structured and formed in the mold through the magnetic field, ensuring that the carbonyl iron powder particles therein are arranged in a chain, and the required anisotropic MRE sealing ring is obtained; The mold containing the MRE material after the magnetic field pre-structuring is placed as a whole between the upper and lower pressing plates of the vulcanizer, and the vulcanization temperature is set. The upper and lower pressing plates of the vulcanizer transfer heat to the heat-conducting pressure head and the heat-conducting base, and the vulcanization pressure is applied through the upper and lower pressing plates by the hydraulic press of the vulcanizer to perform the vulcanization treatment; After the vulcanization treatment is completed, the heating system of the vulcanizer is turned off. After the mold is cooled, the mold is disassembled and demolded to obtain the MRE sealing ring, completing the demolding process.

[0013] Preferably, the sealing ring casting material is polyurethane prepolymer. The beneficial effects of the present invention are: The present invention generates a uniform magnetic field during the casting process of the mold by means of a magnetic field generating device, thereby ensuring that the ferromagnetic particles inside the matrix are arranged in a chain, and improving the magnetomechanical properties of the MRE sealing ring; the mold adopts a modular design of a thermally conductive pressure head, a thermally conductive base, and an inner diameter control mold, which is convenient for disassembly and cleaning, and improves the preparation efficiency; by changing the shape and size of the outer diameter control mold bushing and the inner diameter control mold, it is possible to prepare MRE sealing rings of different shapes and sizes; the present invention uses a thermally conductive pressure head and a thermally conductive base to preheat heat from both upper and lower directions, so that the upper and lower surfaces of the sealing ring can be preferentially solidified and formed, and the interior is still in a fluid state, and the magnetic particles can be arranged in a chain under the action of the magnetic field, thereby ensuring the forming effect of the preparation of the anisotropic sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of an explosion of a mold for casting and preparing an MRE sealing ring in an embodiment of the present invention.

[0015] Figure 2 It is a cross-sectional view of a mold for casting and preparing an MRE sealing ring in an embodiment of the present invention.

[0016] Figure 3 It is a structural schematic diagram of the inner diameter control mold in an embodiment of the present invention.

[0017] Figure 4 Schematic diagram of the structure of the outer diameter control mold in an embodiment of the present invention.

[0018] Figure 5 Schematic diagram of the structure of the heat-conducting base in an embodiment of the present invention.

[0019] Figure 6 Schematic diagram of mold excitation simulation in an embodiment of the present invention.

[0020] Figure 7 It is a schematic structural diagram of an inner diameter control die for preparing a U-shaped ring and a Y-shaped ring in an embodiment of the present invention.

[0021] Figure 8 Schematic diagram of the structure of the bushing in the embodiment of the present invention.

[0022] Fig. 9 It is a schematic diagram of the structure of the exhaust ring when preparing the U-shaped ring in an embodiment of the present invention.

[0023] In the figure: 1-heat transfer plate; 2-exhaust ring; 3-inner diameter control mold; 4-MRE sealing ring; 5-outer diameter control mold; 6-heat conductive base; 7-bushing. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which 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 cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be 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. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1 A mold for casting and preparing an MRE sealing ring, such as Figures 1 to 8 As shown, it includes a mold and a magnetic field generating device, and the mold is arranged in the magnetic field generated by the magnetic field generating device.

[0028] Furthermore, the mold includes a thermally conductive pressure head, a thermally conductive base 6, an outer diameter control mold 5 and an inner diameter control mold 3, the outer diameter control mold 5 and the inner diameter control mold 3 are arranged on the thermally conductive base 6, the inner diameter control mold 3 is sleeved on the inner ring of the outer diameter control mold 5, the lower end of the thermally conductive pressure head is arranged on the inner ring of the outer diameter control mold 5, and arranged on the upper end of the inner diameter control mold 3, the outer ring of the inner diameter control mold 3, the inner ring of the outer diameter control mold 5, the top of the thermally conductive base 6 and the bottom of the thermally conductive pressure head form a casting inner cavity for casting to form a sealing ring; the thermally conductive pressure head and the thermally conductive base are used to form the side end face of the sealing ring, the outer diameter control mold 5 is used to control the outer diameter of the sealing ring to generate a magnetic field with the winding coil, so that the carbonyl iron powder particles form a chain arrangement in the MRE sealing ring, and the inner diameter control mold is used to form the inner diameter of the sealing ring.

[0029] Furthermore, the magnetic field generating device includes an electromagnetic coil wound around the outer ring of the outer diameter control die 5 .

[0030] Furthermore, the thermal conductive pressure head includes a heat transfer pressure plate 1 and an exhaust ring 2, the lower end of the heat transfer pressure plate 1 and the exhaust ring 2 are arranged on the inner ring of the outer diameter control mold 5, and the heat transfer pressure plate 1 is arranged above the exhaust ring 2; wherein the thermal conductive pressure head is formed by the heat transfer pressure plate 1 and the exhaust ring 2 being bonded together, and can realize the molding, pressing and exhausting functions.

[0031] Furthermore, both the outer diameter control mold 5 and the inner diameter control mold 3 are positioned and connected to the heat-conducting base 6 through positioning pins.

[0032] Furthermore, positioning pins are provided at the bottom of the outer diameter control mold 5 and the inner diameter control mold 3, and corresponding thermal conductive base pin holes are distributed on the top of the thermal conductive base 6. The positioning pins at the bottom of the outer diameter control mold 5 and the inner diameter control mold 3 are inserted into the corresponding thermal conductive base pin holes to form positioning.

[0033] Furthermore, the heat transfer platen 1 is provided with a central hole for exhaust and weight reduction; The inner ring of the exhaust ring 2 is used as an exhaust slot hole. Exhaust slots are provided on both sides and the top of the exhaust ring as a material storage slot for exhausting the air inside the molding space and as a storage cavity when the material is pressed and extruded to prevent demolding difficulties. The upper surface of the exhaust ring 2 is chamfered. There are three exhaust paths during MRE preparation: 1. Exhaust through the gap between the thermal pressure head and the outer diameter control die; 2. Exhaust through the exhaust slot; 3. Exhaust through the center hole of the thermal pressure head; the exhaust ring can be replaced according to the requirements of preparing different MRE sealing ring shapes, and MRE sealing rings with different cross-sectional shapes can be prepared, such as Fig. 9 As shown, when a square portion is extended from below the exhaust ring, a U-shaped ring can be prepared, and if the extension is conical, a V-shaped ring can be prepared.

[0034] Furthermore, the central opening of the heat transfer platen 1 , the exhaust holes of the exhaust ring 2 , and the inner circle holes of the inner diameter control die 3 are arranged on the same central axis.

[0035] Example 2 On the basis of Example 1, the materials of the thermally conductive pressure head, the thermally conductive base, the inner diameter control mold and the outer diameter control mold are further limited, and the performance of Example 2 after the limitation is better.

[0036] The material of the thermal conductive pressure head and the material of the thermal conductive base are any one of 10# steel, electrical pure iron and silicon steel, which are used to guide the magnetic field so that as many magnetic flux lines as possible pass through the MRE sealing ring.

[0037] Furthermore, four positioning holes are opened on the heat-conducting base to fix the outer diameter control mold and the inner diameter control mold. To overcome the over-positioning problem, two of the positioning holes are "capsule pin holes" as shown in 601 and 602, that is, composed of two semicircles and a rectangle. The heat-conducting base is hardened on the surface to prevent bumps and bruises, ensuring uniform molding of the bottom of the MRE.

[0038] Furthermore, the inner diameter control mold is made of 304 stainless steel, copper, or aluminum, which is used to isolate the magnetic field and allow as few magnetic flux lines as possible to pass through to reduce magnetic leakage and maximize the use of magnetic energy. The inner diameter control mold is connected and fixed to the thermal base through positioning pins. When in use, the positioning holes on one side are filled with glue and connected and fixed with the positioning cylindrical pins. The purpose is to accurately position and ensure the molding accuracy of the inner diameter of the sealing ring. The other side is not filled with glue for easy assembly. As above, the size and shape of the inner diameter control mold can be replaced due to the requirements for preparing different MRE sealing ring sizes and shapes; The outer diameter control mold is made of 304 stainless steel, copper, or aluminum. The surface is sprayed with insulating paint or insulated with FDMD high temperature resistant insulating paper. It is used as the winding coil skeleton. The winding electromagnetic coil is pure copper enameled wire with a wire diameter of 0.9mm and 600 turns. The results of maxwell electromagnetic simulation analysis show that a magnetic field strength of 0-1T can be generated in the sealing ring preparation cavity when a current of 0-5A is applied, which can provide a wide range of magnetic energy drive for the anisotropic MRE chain arrangement. The outer diameter control mold is connected and fixed to the thermal conductive base through positioning pins. When in use, the positioning holes on both sides are filled with glue (the positioning pins are directly connected to the outer diameter control mold) to ensure that the outer diameter control mold is fixed. Bushings of different sizes or cross-sectional shapes can be selected according to different outer diameter requirements to prepare MRE sealing rings of different sizes or cross-sectional shapes.

[0039] The pin hole on the heat-conducting base is used as a positioning groove for the positioning pin to match the relative position of the outer diameter control mold and the inner diameter control mold to ensure the inner and outer diameter dimensions of the material. By changing the dimensions of the inner and outer diameter control molds or adding bushings, MRE rings of different sizes can be prepared. Through the optimal matching of mold materials (the purpose of the optimal matching is to guide the magnetic flux lines through the material molding cavity, and the specific measures include: the outer diameter control mold and the inner diameter control mold are both made of 304 stainless steel (copper or aluminum can also be used, considering the material strength and low cost, 304 is selected), which has a relatively small magnetic permeability and low cost, and the heat-conducting pressure head (heat transfer plate, exhaust ring) and the base are all made of strong magnetic conductive materials such as 10# steel), the casting chamber can be subjected to a uniform magnetic field when preparing the MRE sealing ring. Changing the size of the coil current can change the degree of directional arrangement of the carbonyl iron powder particles inside the sealing ring during preparation, so as to achieve the effect of preparing MRE sealing rings with different properties.

[0040] The mold also includes a bushing, and bushings of different sizes can be selected and arranged on the outer ring of the inner diameter control mold and / or the inner ring of the outer diameter control mold.

[0041] A method for preparing an anisotropic sealing ring using the above-mentioned MRE sealing ring casting preparation mold comprises the following steps: preheating the mold; Add ferromagnetic particles to the sealing ring casting material and mix them evenly to form MRE material, and inject the MRE material into the casting cavity of the mold; A uniform magnetic field is generated by a magnetic field generating device, and a certain magnetic field strength of 100mT~1000mT is maintained. The casting material is fully pre-structured and formed in the mold through the magnetic field to ensure the chain arrangement of anisotropic carbonyl iron powder particles; After the magnetic field pre-structuring is completed, the mold containing the MRE material is placed as a whole between the upper and lower pressing plates of the flat vulcanizer, the vulcanization temperature is set, and the vulcanization pressure is applied by a hydraulic press to perform the vulcanization treatment; After the vulcanization treatment is completed, the heating system is turned off, and after the mold is cooled, the mold is disassembled and demolded to obtain the MRE sealing ring 4, completing the demolding process.

[0042] The sealing ring preparation method mainly includes the following steps: preheating the mold body, magnetic field control, material pouring, curing and demoulding, and more specifically: Step 1: Mold preparation: Determine the size and cross-sectional shape of the sealing ring to be prepared, select a suitable mold to match, bond the heat transfer plate 1 and the exhaust ring 2 with adhesive (502 glue can be used) to form a thermal pressure head, and then evenly spray each part of the mold with polyurethane high-efficiency release agent to facilitate subsequent demolding. The mold assembly sequence is as follows: heat-conducting base 6-outer diameter control mold 5-inner diameter control mold 3-heat-conducting pressure head (heat transfer pressure plate 1 and exhaust ring 2). Specifically, first fix the heat-conducting base 6, match the two positioning pins 502 and 503 on the bottom surface of the outer diameter control mold 5 with the pin holes 601 and 603 of the heat-conducting base respectively, and then match the positioning pins 301 and 302 of the inner diameter control mold 3 with the pin holes 602 and 604 of the heat-conducting base respectively. At this point, the inner diameter control mold, the outer diameter control mold, and the heat-conducting base form the MRE sealing ring 4 material storage cavity, and then insert the heat-conducting pressure head into the inner diameter 501 of the outer diameter control mold 5. The match is concentric, and the mold assembly is completed. The cross-sectional view is shown in FIG. Figure 2 As shown; Step 2: Preheating the mold: Start the flat vulcanizer, and make the heat transfer plate 1 and the heat conductive base 6 directly contact with the heating plate of the flat vulcanizer. The preheating principle of other parts in the mold is the heat conduction of the material. The preheating time is 30 minutes, so that the temperature of other parts in the mold rises to 110°C to ensure good fluidity of the subsequent casting of polyurethane magnetorheological material; Step 3: Material pouring: Mix the polyurethane prepolymer and the ferromagnetic particles evenly, draw with a syringe, and slowly inject into the cavity formed by the outer diameter control mold 5 and the inner diameter control mold 3 until it is full and slightly overflows, and then match the lower surface of the thermal conductive pressure head (combination of 1 and 2) with the upper surface of the inner diameter control mold 3. To ensure the matching lubrication, the outer diameter of the thermal conductive pressure head (101 and 201) and the inner diameter of the outer diameter control mold (501) differ by 0.2 mm; Step 4: Magnetic field pre-structuring: energize the electromagnetic coil wound on the outer diameter control mold 5 to generate a uniform magnetic field with a magnetic field strength of 0T-1T. Maintain the magnetic field strength so that the material can be fully pre-structured and formed in the mold. The pre-structuring time is 30 minutes to ensure that the carbonyl iron powder particles are arranged in a chain to obtain an anisotropic MRE sealing ring. Step 5: Curing and molding: Place the mold containing the MRE material after the magnetic field pre-structuring is completed between the upper and lower platens of the flat vulcanizer, set the vulcanization temperature to 110°C, apply a vulcanization pressure of 15MPa through a hydraulic press, and set the time to 30min. This process is a single vulcanization; Step 6: Demolding: After the primary vulcanization is completed, turn off the heating system, wait for the mold to cool down, and then decompose and demold the mold. The decomposition process is to perform a demolding action on the outer ring 102 in the heat transfer platen 1, so that it drives the exhaust ring 2 to separate from the outer diameter control mold. After separation, the molded MRE sealing ring is still in the cavity formed by the inner diameter control mold 3, the outer diameter control mold 5 and the thermal conductive base 6. The outer diameter control mold 5 needs to be pulled up to separate it from the thermal conductive base 6. Finally, use a tool to pull off the inner diameter control mold 5 to obtain the MRE sealing ring 4 and complete the demolding process.

[0043] In summary, 1. Integrated magnetic field generating device: The mold has built-in electromagnetic coils, which can generate a uniform magnetic field during the casting process, ensure the chain arrangement of ferromagnetic particles, and improve the magnetomechanical properties of the MRE sealing ring. 2. Modular design: The mold adopts a modular design of thermal conductive pressure head, thermal conductive base and inner diameter control mold, which is easy to disassemble and clean, improves preparation efficiency, and controls the shape and size of the mold by changing the outer diameter and inner diameter, making it possible to prepare MRE sealing rings with different cross-sectional shapes and sizes. 3. Precise magnetic control: By precisely controlling the size of the current, the magnetic field strength generated by the excitation coil is controlled to ensure the performance stability and consistency of the MRE sealing ring. 4. Controllable forming and easy demoulding: The mold adopts the upper heat-conducting base priority preheating scheme, and the other molds are preheated by heat conduction. This design allows the upper and lower surfaces of the sealing ring to be solidified and formed first, while the interior is still in a fluid state. The magnetic particles can be arranged in a chain under the action of the magnetic field to ensure the molding effect and magnetomechanical properties of the sealing ring. The design of the exhaust ring material storage groove and the selection of the demoulding agent make the sealing ring demoulding efficiency high, the sealing ring molding quality good, and not easy to get stuck.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A mold for casting and preparing an MRE sealing ring, characterized in that: It includes a mold and a magnetic field generating device, and when working, the mold is arranged in the magnetic field generated by the magnetic field generating device; The mold comprises a heat-conducting pressure head, a heat-conducting base (6), an outer diameter control mold (5) and an inner diameter control mold (3); the outer diameter control mold (5) and the inner diameter control mold (3) are arranged on the heat-conducting base (6); the inner diameter control mold (3) is sleeved on the inner ring of the outer diameter control mold (5); the lower end of the heat-conducting pressure head is arranged on the inner ring of the outer diameter control mold (5) and arranged on the upper end of the inner diameter control mold (3); the outer ring of the inner diameter control mold (3), the inner ring of the outer diameter control mold (5), the top of the heat-conducting base (6) and the bottom of the heat-conducting pressure head form a casting inner cavity for casting to form a sealing ring.

2. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The magnetic field generating device comprises an electromagnetic coil wound around the outer ring of the outer diameter control die (5).

3. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The heat transfer pressure head comprises a heat transfer pressure plate (1) and an exhaust ring (2); the lower end of the heat transfer pressure plate (1) and the exhaust ring (2) are arranged on the inner ring of the outer diameter control mold (5); and the heat transfer pressure plate (1) is arranged above the exhaust ring (2).

4. The MRE sealing ring casting and preparation mold according to claim 3, characterized in that: The heat transfer pressing plate is bonded to the exhaust ring.

5. The MRE sealing ring casting and preparation mold according to claim 2, characterized in that: The outer diameter control die (5) and the inner diameter control die (3) are both positioned and connected to the heat-conducting base (6) via positioning pins.

6. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The heat transfer platen (1) is provided with a central hole for exhaust and weight reduction; The inner ring of the exhaust ring (2) serves as an exhaust slot hole, and exhaust slots are provided on both sides and the top of the exhaust ring to serve as material storage slots for exhausting air inside the molding space and for serving as a storage cavity when the material is extruded under pressure.

7. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The material of the heat-conducting pressure head and the material of the heat-conducting base are any one of 10# steel, electrical pure iron and silicon steel.

8. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The inner diameter control mold material is 304 stainless steel, copper, or aluminum; The outer diameter control mold material is 304 stainless steel, copper, or aluminum, and the surface is sprayed with insulating paint or insulated with FDMD high temperature resistant insulating paper as a winding coil skeleton.

9. The MRE sealing ring casting and preparation mold according to claim 1, characterized in that: The mold further comprises a bushing, which is sleeved on the outer ring of the inner diameter control mold (3) and / or the inner ring of the outer diameter control mold (5).

10. A method for preparing an anisotropic sealing ring using the MRE sealing ring casting preparation mold as claimed in claim 1, characterized in that: The following steps are involved: Preheat the mold; Add ferromagnetic particles to the sealing ring casting material and mix them evenly to form MRE material, and inject the MRE material into the casting cavity of the mold; A uniform magnetic field is generated by a magnetic field generating device, and the magnetic field is maintained at a certain strength, so that the MRE material can be fully pre-structured and formed in the mold through the magnetic field, ensuring the chain arrangement of anisotropic carbonyl iron powder particles; The mold containing the MRE material after the magnetic field pre-structuring is placed as a whole between the upper and lower pressing plates of the vulcanizer, and the vulcanization temperature is set. The upper and lower pressing plates of the vulcanizer transfer heat to the thermal conductive pressure head and the thermal conductive base, and the vulcanization pressure is applied to perform the vulcanization treatment; After the vulcanization treatment is completed, the heating system of the vulcanizer is turned off. After the mold is cooled, the mold is disassembled and demolded to obtain the MRE sealing ring, completing the demolding process.

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