An MRE sealing ring casting preparation mold and an anisotropic sealing ring preparation method

Abstract

The present invention discloses a pouring preparation mold for an MRE sealing ring and a preparation method for an anisotropic sealing ring, including a mold and a magnetic field generating device, and the mold is arranged in the magnetic field generated by the magnetic field generating device; the mold includes a heat-conducting pressure head, a heat-conducting 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 heat-conducting base, the inner diameter control mold is sleeved on the inner ring of the outer diameter control mold, the lower end of the heat-conducting pressure head is arranged on the inner ring of the outer diameter control mold and is arranged at the upper end of the inner diameter control mold, and an inner pouring cavity is formed by the outer ring of the inner diameter control mold, the inner ring of the outer diameter control mold, the top of the heat-conducting base and the bottom of the heat-conducting pressure head for pouring and forming an anisotropic MRE sealing ring. The present invention can improve the magneto-mechanical properties of the MRE sealing ring; is convenient for disassembly and cleaning, improves the preparation efficiency, and ensures the forming effect of the sealing ring preparation.

Description

Technical Field

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

[0002] Hydraulic systems play a crucial 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 have problems such as non-adjustable sealing performance and poor adaptability (pressure fluctuations) under extreme conditions, leading to seal failure. To address these challenges, magnetorheological elastomers (MREs), as a type of smart material, have been introduced into the sealing field. They can change their mechanical properties under the action of an external magnetic field, providing a dynamic and adaptive sealing solution. However, in the preparation of sealing rings, existing molds have complex designs, are inconvenient to disassemble and demold, cannot be magnetized or have uneven magnetic field distribution, resulting in unstable performance of MRE sealing rings. In addition, traditional molds are difficult to achieve the chain arrangement of ferromagnetic particles in MRE materials, affecting the magneto-mechanical properties of the sealing rings. Therefore, there is an urgent need for an efficient and precise preparation mold and method for anisotropic MRE sealing rings. Summary of the Invention

[0003] The purpose of the present invention is to provide a casting preparation mold for an MRE sealing ring and a preparation method for an anisotropic sealing ring, which can improve the magneto-mechanical properties of the MRE sealing ring; facilitate disassembly and cleaning, improve the preparation efficiency, and ensure the forming effect of the sealing ring preparation.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A casting preparation mold for an MRE sealing ring includes a mold and a magnetic field generating device. During operation, the mold is arranged in the magnetic field generated by the magnetic field generating device;

[0006] The mold includes a heat-conducting punch, a heat-conducting 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 heat-conducting base. The inner diameter control mold is sleeved on the inner ring of the outer diameter control mold. The lower end of the heat-conducting punch is arranged in the inner ring of the outer diameter control mold and is arranged above 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 heat-conducting base, and the bottom of the heat-conducting punch form a casting inner cavity for casting an anisotropic MRE sealing ring.

[0007] Preferably, the magnetic field generating device includes an electromagnetic coil wound around the outer ring of the outer diameter control mold.

[0008] Preferably, the heat-conducting punch includes a heat transfer pressing plate and an exhaust ring. The lower end of the heat transfer pressing plate and the exhaust ring are arranged in the inner ring of the outer diameter control mold, and the heat transfer pressing plate is arranged above the exhaust ring; wherein the heat-conducting punch is adhesively combined by the heat transfer pressing plate and the exhaust ring, and can realize the forming and pressure-feeding and exhaust functions.

[0009] Preferably, the heat transfer pressure plate is adhesively connected to the exhaust ring.

[0010] Preferably, both the outer diameter control die and the inner diameter control die are positioned and connected to the heat conducting base through positioning pins.

[0011] Preferably, the heat transfer pressure plate is provided with a central hole for exhaust and weight reduction;

[0012] Preferably, the materials of both the heat conducting pressure head and the heat conducting base are any one of 10# steel, electrolytic iron, and silicon steel.

[0013] Preferably, the material of the inner diameter control die is 304 stainless steel, copper, or aluminum;

[0014] The material of the outer diameter control die is 304 stainless steel, copper, or aluminum, and its surface is sprayed with insulating paint or insulated with FDMD high-temperature resistant insulating paper to serve as the winding coil skeleton.

[0015] 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.

[0016] A method for preparing an anisotropic sealing ring by using the MRE sealing ring casting preparation mold as described above includes the following steps:

[0017] Preheat the mold;

[0018] Add ferromagnetic particles to the sealing ring casting material and mix evenly to form MRE material, and inject the MRE material into the casting cavity of the mold;

[0019] Generate a uniform magnetic field through a magnetic field generating device, maintain a certain intensity of the magnetic field, and enable the MRE material to be fully pre-structured and formed in the mold through the magnetic field to ensure the chain arrangement of the carbonyl iron powder particles therein, thereby obtaining the required anisotropic MRE sealing ring;

[0020] After the magnetic field pre-structuring is completed, place the mold filled with MRE material as a whole between the upper and lower pressure plates of the vulcanizer, set the vulcanization temperature, transfer the heat from the upper and lower pressure plates of the vulcanizer to the heat conducting pressure head and the heat conducting base, and apply vulcanization pressure through the hydraulic press of the vulcanizer via the upper and lower pressure plates for vulcanization treatment;

[0021] After the vulcanization treatment is completed, turn off the heating system of the vulcanizer. After the mold cools down, disassemble and demold the mold to obtain the MRE sealing ring, thus completing the demolding process.

[0022] Preferably, the sealing ring casting material is polyurethane prepolymer.

[0023] The beneficial effects of the present invention are:

[0024] The present invention uses a magnetic field generating device to generate a uniform magnetic field during the die casting process, ensuring the chain arrangement of ferromagnetic particles inside the matrix and improving the magneto-mechanical properties of the MRE sealing ring. The die adopts a modular design of a heat-conducting pressure head, a heat-conducting base, and an inner diameter control die, which is convenient for disassembly and cleaning, improving the preparation efficiency. By changing the shape and size of the outer diameter control die bushing and the inner diameter control die, it becomes possible to prepare MRE sealing rings of different shapes and sizes. The present invention conducts heat conduction preheating from two directions, top and bottom, through the heat-conducting pressure head and the heat-conducting base, enabling the upper and lower surfaces of the sealing ring to be preferentially cured and formed, while the interior remains in a flowing state. The magnetic particles can be arranged in a chain under the action of the magnetic field, ensuring the forming effect of the anisotropic sealing ring preparation. Description of the Drawings

[0025] Figure 1 is an exploded schematic view of the die-casting preparation die for the MRE sealing ring in the embodiment of the present invention.

[0026] Figure 2 is a cross-sectional view of the die-casting preparation die for the MRE sealing ring in the embodiment of the present invention.

[0027] Figure 3 is a structural schematic view of the inner diameter control die in the embodiment of the present invention.

[0028] Figure 4 is a structural schematic view of the outer diameter control die in the embodiment of the present invention.

[0029] Figure 5 is a structural schematic view of the heat-conducting base in the embodiment of the present invention.

[0030] Figure 6 is a schematic diagram of the die excitation simulation in the embodiment of the present invention.

[0031] Figure 7 is a structural schematic view of the inner diameter control die for preparing U-shaped rings and Y-shaped rings in the embodiment of the present invention.

[0032] Figure 8 is a structural schematic view of the bushing in the embodiment of the present invention.

[0033] Figure 9 is a structural schematic view of the exhaust ring when preparing U-shaped rings in the embodiment of the present invention.

[0034] In the figure: 1 - heat transfer pressing plate; 2 - exhaust ring; 3 - inner diameter control die; 4 - MRE sealing ring; 5 - outer diameter control die; 6 - heat-conducting base; 7 - bushing. Detailed Embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0036] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This 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. Therefore, it should not be construed 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between 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.

[0038] Embodiment 1

[0039] An MRE seal ring casting preparation mold, as Figures 1 - 8 shown, includes a mold and a magnetic field generating device, and the mold is disposed in the magnetic field generated by the magnetic field generating device.

[0040] Further, the mold includes a heat-conducting punch, 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 punch is arranged on the inner ring of the outer diameter control mold 5 and is disposed above 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 punch form a pouring inner cavity for pouring and forming a sealing ring. The heat-conducting punch and the heat-conducting base are used to form the side end faces of the sealing ring. The outer diameter control mold 5 is used to control the outer diameter of the formed sealing ring and generate a magnetic field with the wound coil, so that the carbonyl iron powder particles form a chain-like arrangement in the MRE sealing ring. The inner diameter control mold is used to form the inner diameter of the sealing ring.

[0041] Further, the magnetic field generating device includes an electromagnetic coil wound around the outer ring of the outer diameter control mold 5.

[0042] Further, the heat-conducting punch includes a heat-transfer pressing plate 1 and an exhaust ring 2. The lower end of the heat-transfer pressing plate 1 and the exhaust ring 2 are arranged in the inner ring of the outer diameter control mold 5, and the heat-transfer pressing plate 1 is disposed above the exhaust ring 2. The heat-conducting punch is formed by adhesively cooperating the heat-transfer pressing plate 1 and the exhaust ring 2, and can achieve the functions of forming and pressing material for exhausting air.

[0043] Further, 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.

[0044] Further, positioning pins are provided at the bottoms of the outer diameter control mold 5 and the inner diameter control mold 3, and corresponding heat-conducting base pin holes are distributed on the top of the heat-conducting base 6. The positioning pins at the bottoms of the outer diameter control mold 5 and the inner diameter control mold 3 are inserted into the corresponding heat-conducting base pin holes to form positioning.

[0045] Further, the heat-transfer pressing plate 1 is provided with a central hole for exhausting air and reducing weight;

[0046] The inner ring of the exhaust ring 2 serves as an exhaust groove hole. Exhaust grooves are opened on both sides and the top of the exhaust ring and serve as material storage grooves for exhausting the air inside the forming space and storing the cavity when the material is extruded under pressure, preventing difficult demolding. A chamfer is provided on the upper surface of the exhaust ring 2. When preparing MRE, the exhaust path is divided into three types: 1. Exhausting air through the fitting clearance between the heat-conducting punch and the outer diameter control mold; 2. Exhausting air through the exhaust groove; 3. Exhausting air through the central hole of the heat-conducting punch. The exhaust ring can be replaced according to the requirements for preparing different MRE sealing ring shapes, and MRE sealing rings with different cross-sectional shapes can be prepared. For example, Figure 9 As shown, when a part of the square extends below the exhaust ring, a U-shaped ring can be prepared. If the extension is conical, a V-shaped ring can be prepared.

[0047] Further, the central opening of the heat-transfer pressing plate 1, the exhaust holes of the exhaust ring 2, and the inner ring holes of the inner diameter control mold 3 are arranged on the same central axis.

[0048] Example 2

[0049] On the basis of Example 1, the materials of the heat-conducting pressure head, heat-conducting base, inner diameter control die, and outer diameter control die are further defined, and the performance of Example 2 after the definition is better.

[0050] The materials of the heat-conducting pressure head and the heat-conducting base are any one of 10# steel, electrolytic iron, and silicon steel, which are used to guide the magnetic field so that as many magnetic induction lines as possible pass through the MRE sealing ring.

[0051] Furthermore, four positioning holes are opened on the heat-conducting base to fix the outer diameter control die and the inner diameter control die. To overcome the problem of over-positioning, two of the positioning holes, such as 601 and 602, are "capsule pin holes", that is, composed of two semi-circles and a rectangle. The surface of the heat-conducting base is hardened to prevent knocking and bumping, and to ensure uniform bottom forming of the MRE.

[0052] Furthermore, the material of the inner diameter control die is 304 stainless steel, copper, or aluminum, which is used to isolate the magnetic field so that as few magnetic induction lines as possible pass through to reduce magnetic leakage and maximize the utilization of magnetic energy. The inner diameter control die is connected and fixed to the heat-conducting base through a positioning pin. During use, one side of the positioning hole is filled with glue and connected and fixed to the positioning cylindrical pin for precise positioning to ensure the forming accuracy of the inner diameter of the sealing ring, and the other side is not filled with glue for convenient assembly. Similarly, the size and shape of the inner diameter control die can be replaced according to the requirements of different MRE sealing ring sizes and shapes;

[0053] The material of the outer diameter control die 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, the winding electromagnetic coil is made of pure copper enameled wire with a wire diameter of 0.9 mm and 600 turns. Using Maxwell electromagnetic simulation analysis, the results show that a magnetic field intensity of 0-1 T can be generated in the cavity for preparing the sealing ring when a current of 0-5 A is applied, which can provide a wide range of magnetic energy drive for the anisotropic MRE chain arrangement. The outer diameter control die is connected and fixed to the heat-conducting base through a positioning pin. During use, both sides of the positioning hole are filled with glue (the positioning pin is directly connected to the outer diameter control die) to ensure the fixation of the outer diameter control die. Different sizes or cross-sectional shapes of bushing sleeves can be selected according to different outer diameters for preparing MRE sealing rings with different sizes or cross-sectional shapes.

[0054] The pin holes on the heat-conducting base serve as the positioning grooves for the positioning pins, which are used to coordinate the relative positions of the outer diameter control die and the inner diameter control die to ensure the inner and outer diameter dimensions of the material. By changing the dimensions of the inner and outer diameter control dies or adding bushings, MRE rings of different sizes can be prepared. Through the optimal combination of die materials (the purpose of the optimal combination is to guide the magnetic induction lines through the material forming cavity. The specific measures include: both the outer diameter control die and the inner diameter control die are made of 304 stainless steel with relatively low relative magnetic permeability and low cost (copper or aluminum can also be used, and 304 is selected considering material strength and low cost), while the heat-conducting punch (heat-transfer pressing plate, exhaust ring) and the base are made of strongly magnetic materials such as 10# steel), the casting chamber can be subjected to a uniform magnetic field when preparing the MRE sealing ring. By changing the magnitude of the current passing through the coil during preparation, the degree of oriented arrangement of carbonyl iron powder particles inside the sealing ring can be changed, achieving the effect of preparing MRE sealing rings with different properties.

[0055] The die also includes bushings, and bushings of different sizes can be selected and set on the outer ring of the inner diameter control die and / or the inner ring of the outer diameter control die.

[0056] An anisotropic sealing ring preparation method using the above-mentioned MRE sealing ring casting preparation die includes the following steps: preheating the die;

[0057] Adding ferromagnetic particles to the sealing ring casting material and mixing evenly to form MRE material, and injecting the MRE material into the casting cavity of the die;

[0058] Generating a uniform magnetic field through a magnetic field generating device, maintaining a certain magnetic field intensity of 100 mT to 1000 mT, and enabling the casting material to be fully pre-structured and formed in the die through the magnetic field to ensure the chain-like arrangement of anisotropic carbonyl iron powder particles;

[0059] After the magnetic field pre-structuring is completed, the die filled with MRE material is placed as a whole between the upper and lower pressing plates of a flat vulcanizing machine, the vulcanization temperature is set, and vulcanization pressure is applied through a hydraulic press for vulcanization treatment;

[0060] After the vulcanization treatment is completed, the heating system is turned off. After the die cools down, the die is disassembled and demolded to obtain the MRE sealing ring 4, completing the demolding process.

[0061] The main steps of the above-mentioned sealing ring preparation method are as follows: preheating the die body, magnetic field regulation, material casting, curing and forming, and demolding treatment. More specific steps are as follows:

[0062] Step 1: Mold Preparation: Determine the size and cross-sectional shape of the seal ring to be prepared, select a suitable mold for matching, bond the heat transfer pressure plate 1 and the exhaust ring 2 with an adhesive (which can be 502 glue) to form a heat conduction pressure head, and then evenly spray a polyurethane high-efficiency demolding agent on each part of the mold to facilitate subsequent demolding. The mold assembly sequence is the heat conduction base 6 - the outer diameter control mold 5 - the inner diameter control mold 3 - the heat conduction pressure head (the heat transfer pressure plate 1 and the exhaust ring 2). Specifically, first fix the heat conduction 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 conduction 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 conduction base respectively. Thus, a storage cavity for the MRE seal ring 4 is formed among the inner diameter control mold, the outer diameter control mold, and the heat conduction base. Then insert the heat conduction pressure head into the inner diameter 501 of the outer diameter control mold 5, and the fit is a concentric fit. The mold assembly is completed, and the cross-sectional view is as shown in Figure 2 shown;

[0063] Step 2: Mold Preheating: Start the flat vulcanizing machine, directly contact the heat transfer pressure plate 1 and the heat conduction base 6 with the heating plate of the flat vulcanizing machine. The preheating principle of other parts in the mold is heat conduction of materials. 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 poured polyurethane magnetorheological material;

[0064] Step 3: Material Pouring: Mix the polyurethane prepolymer and ferromagnetic particles evenly, extract them with a syringe, and slowly inject them into the cavity formed by the outer diameter control mold 5 and the inner diameter control mold 3. After filling until slightly overflowing, match the lower surface of the heat conduction pressure head (the combination of 1 and 2) with the upper surface of the inner diameter control mold 3. To ensure smooth fitting, the outer diameter of the heat conduction pressure head (101 and 201) is 0.2 mm different from the inner diameter of the outer diameter control mold (501);

[0065] Step 4: Magnetic Field Pre-structuring: Energize the electromagnetic coil wound around the outer diameter control mold 5 to generate a uniform magnetic field with a magnetic field strength of 0 T - 1 T. Keep 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 the chain arrangement of carbonyl iron powder particles and produce an anisotropic MRE seal ring;

[0066] Step 5: Curing and Forming: Place the mold containing the MRE material after magnetic field pre-structuring as a whole between the upper and lower pressure plates of the flat vulcanizing machine. Set the vulcanization temperature to 110 °C, apply a vulcanization pressure of 15 MPa through the hydraulic press, and set the time to 30 minutes. This process is the first vulcanization;

[0067] Step 6: Demolding process: After the first vulcanization is completed, turn off the heating system. After the mold cools down, disassemble the mold for demolding. The disassembly process is to perform a demolding action on the outer ring 102 of the heat transfer pressing plate 1, so that it drives the exhaust ring 2 to separate from the outer diameter control mold. After separation, the formed MRE sealing ring is still in the cavity formed by the inner diameter control mold 3, the outer diameter control mold 5, and the heat conduction base 6. It is necessary to lift the outer diameter control mold 5 to separate it from the heat conduction base 6. Finally, use a tool to pull out the inner diameter control mold 5 to obtain the MRE sealing ring 4, completing the demolding process.

[0068] In summary, 1. Integrated magnetic field generation device: The mold is internally equipped with an electromagnetic coil, which can generate a uniform magnetic field during the pouring process to ensure the chain-like arrangement of ferromagnetic particles and improve the magneto-mechanical properties of the MRE sealing ring. 2. Modular design: The mold adopts a modular design of a heat conduction pressing head, a heat conduction base, and an inner diameter control mold, which is convenient for disassembly and cleaning, improves the preparation efficiency, and makes it possible to prepare MRE sealing rings with different cross-sectional shapes and sizes by changing the shapes and sizes of the outer diameter control mold bushing and the inner diameter control mold. 3. Precise magnetic control: By precisely controlling the magnitude of the energized current, the magnetic field intensity generated by the excitation coil is controlled to ensure the performance stability and consistency of the MRE sealing ring. 4. Controllable forming and convenient demolding: The mold adopts a preferential preheating scheme for the upper heat conduction base, and the rest of the mold is preheated by heat conduction. This design enables the upper and lower surfaces of the sealing ring to be preferentially cured and formed, while the inside is still in a flowing state. The magnetic particles can be chain-like arranged under the action of the magnetic field, ensuring the forming effect and magneto-mechanical properties of the sealing ring preparation; the design of the exhaust ring material storage groove and the selection of the demolding agent enable high demolding efficiency of the sealing ring, good forming quality of the sealing ring, and not easy to get stuck in the mold.

[0069] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0070] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. An MRE sealing ring casting preparation mold, characterized in that: It includes a mold and a magnetic field generating device. During operation, the mold is arranged within the magnetic field generated by the magnetic field generating device; The mold includes a heat-conducting press 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 press head is arranged on the inner ring of the outer diameter control mold (5) and is disposed at 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 press head form a casting inner cavity for casting and forming a sealing ring; The magnetic field generating device includes an electromagnetic coil wound around the outer ring of the outer diameter control mold (5); The heat-conducting press head includes a heat-transfer pressing plate (1) and an exhaust ring (2). The lower end of the heat-transfer pressing plate (1) and the exhaust ring (2) are arranged within the inner ring of the outer diameter control mold (5), and the heat-transfer pressing plate (1) is disposed above the exhaust ring (2).

2. The MRE seal ring casting preparation mold according to claim 1, characterized in that: The heat-transfer pressing plate is adhesively connected to the exhaust ring.

3. The MRE seal ring casting preparation mold according to claim 1, characterized in that: 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.

4. The MRE seal ring casting preparation mold according to claim 1, characterized in that: The heat-transfer pressing plate (1) is provided with a central hole for exhausting air and reducing weight; The inner ring of the exhaust ring (2) serves as an exhaust groove hole. Exhaust grooves are provided on both sides and the top of the exhaust ring, serving as material-containing grooves for exhausting the air inside the forming space and storing the cavity when the material is extruded under pressure.

5. The pouring and preparation mold for the MRE sealing ring according to claim 1, characterized in that: The material of the heat-conducting press head and the heat-conducting base is any one of 10# steel, electrolytic iron, and silicon steel.

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

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

8. An anisotropic seal ring preparation method using the MRE seal ring casting preparation mold as described in claim 1, characterized in that: It includes the following steps: Preheat the mold; Add ferromagnetic particles to the sealing ring casting material and mix evenly to form MRE material, and inject the MRE material into the casting cavity of the mold; Generate a uniform magnetic field through the magnetic field generating device, maintain a certain magnetic field strength, and enable the MRE material to be 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, place the mold filled with MRE material as a whole between the upper and lower pressing plates of the vulcanizer, set the vulcanization temperature, transfer the heat from the upper and lower pressing plates of the vulcanizer to the heat-conducting press head and the heat-conducting base, apply vulcanization pressure, and perform vulcanization treatment; After the vulcanization treatment is completed, turn off the heating system of the vulcanizer. After the mold cools down, disassemble and demold the mold to obtain an MRE sealing ring, completing the demolding process.

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