A one-die multi-cavity magnetic core forming die and a forming device thereof

Abstract

The utility model relates to magnetic powder core processing equipment technical field discloses a one -mode multi -cavity's magnetic core forming die and forming device, and the magnetic core forming die includes upper die, middle die, lower die and core mould, and the core mould includes several core rods, and the lower die includes several lower punch rod, and the middle die is provided with a plurality of second straight -through holes along the vertical direction, and the upper die includes several upper punch rod, when the upper die, middle die, lower die and core mould close the mould, and the closed annular cavity is formed to several. Through adopting one -mode multi -cavity's structure, fundamentally solve the problem of traditional single -cavity die when pressing annular magnetic powder core low efficiency, capacity limited. Through forming and pressing multiple magnetic cores simultaneously in one pressing action, greatly improve production efficiency, make the output can double even several times in the same production time, significantly reduce the production cost of unit product.

Description

Technical Field

[0001] This utility model relates to the technical field of magnetic powder core processing equipment, and in particular to a multi-cavity magnetic core forming mold and its forming device. Background Technology

[0002] Currently, there are various powder metallurgy forming methods, resulting in numerous classifications. The most common method is powder compression molding, which involves loading a mixture of metal powders into a steel mold cavity, pressing the powder under pressure using a die punch, and then releasing the pressure to remove the compact from the mold cavity, completing the forming process. In continuous production, most molds are designed with one cavity per mold, pressing one magnetic core at a time, which limits production efficiency. If there is a large customer demand and tight delivery time, it is necessary to increase the number of machines and use multiple sets of molds to increase production capacity. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this invention is to propose a multi-cavity magnetic core forming mold and its forming device, thereby solving the problem of low efficiency in pressing annular magnetic powder cores when using a single-cavity mold.

[0004] To achieve this objective, the present invention adopts the following technical solution: A multi-cavity magnetic core forming mold includes an upper mold, a middle mold, a lower mold, and a core mold. The core mold includes a plurality of core rods, each core rod being a straight rod. The length direction of the core rods is arranged in the vertical direction. The plurality of core rods are of the same size and are spaced apart in the horizontal direction. The lower die includes a plurality of lower punches, all of which are the same size. Each lower punch is a hollow straight rod, and its length is arranged vertically. A first through hole is provided through the lower punch in the vertical direction. Each of the lower punches corresponds to a plurality of mandrels. The inner circumference of the first through hole matches the outer circumference of the mandrel. Each of the mandrels passes through the first through hole and is inserted into its corresponding lower punch. The middle mold includes a middle mold body, and the middle mold body is provided with a plurality of second through holes in a vertical direction. The plurality of second through holes are of the same size, and the plurality of second through holes correspond one-to-one with the plurality of lower punches. The inner circumference of the second through hole matches the outer circumference of the lower punch, and the plurality of lower punches are respectively inserted into their corresponding second through holes. The upper die includes a plurality of upper punches, all of the same size. Each upper punch is a hollow straight rod, and its length is arranged vertically. Each upper punch has a vertically opening straight hole inside, with the opening facing downwards. The plurality of upper punches correspond one-to-one with a plurality of lower punches, and each upper punch is positioned directly above its corresponding lower punch. The inner circumference of the opening straight hole matches the outer circumference of the mandrel, and the outer circumference of the upper punch matches the inner circumference of the second through hole. The top surface of the lower punch is provided with a lower forming surface, and the bottom surface of the upper punch is provided with an upper forming surface. When the upper mold, the middle mold, the lower mold and the core mold are closed, a plurality of corresponding upper punches, lower punches, second through holes and core rods, a plurality of lower forming surfaces, a plurality of upper forming surfaces, a plurality of inner walls of the plurality of second through holes and a plurality of outer walls of the plurality of core rods enclose and form a plurality of closed annular cavities. The upper punches and lower punches can move closer to or further away from each other in the vertical direction.

[0005] Preferably, the top surface of the middle mold body, the top surface of the mandrel, and the lower forming surface are arranged parallel to each other. The middle mold body and the mandrel can move in the vertical direction. After the magnetic core is pressed, the top surface of the middle mold body, the top surface of the mandrel, and the lower forming surface are located on the same plane.

[0006] Preferably, the upper die includes an upper die body, and a plurality of upper punches are equally spaced along the circumference on the lower side of the upper die body; The lower die includes a lower die body, and a plurality of upper punches are equally spaced along the circumference on the upper side of the lower die body; The core mold includes a core mold body, and a plurality of core rods are arranged at equal intervals along the circumference on the upper side of the core mold body.

[0007] Preferably, the core mold body is located below the lower mold body, and the lower mold body is provided with a plurality of third through holes in the vertical direction, through which a plurality of core rods are inserted.

[0008] Preferably, the upper mold includes an upper mold cover plate, which is detachably mounted on the lower side of the upper mold body by means of a fastener. The upper mold cover plate is provided with a plurality of first mounting holes, which correspond one-to-one with a plurality of upper punches. The diameter of the mounting holes matches the outer diameter of the upper punches. The plurality of upper punches pass through their corresponding first mounting holes. The upper end of the upper punch is provided with a first mounting protrusion ring, which is located between the upper mold cover plate and the upper mold body. The upper mold cover plate is used to clamp the first mounting protrusion ring and fix the upper punches. The lower die includes a lower die cover plate, which is detachably mounted on the upper side of the lower die body by means of a fastener. The lower die cover plate is provided with a plurality of second mounting holes, which correspond one-to-one with a plurality of lower punches. The diameter of the mounting holes matches the outer diameter of the lower punches. The lower punches pass through their corresponding second mounting holes. The lower end of each lower punch is provided with a second mounting protrusion ring, which is located between the lower die cover plate and the lower die body. The lower die cover plate is used to clamp the second mounting protrusion ring and fix the lower punches. The core mold includes a core mold cover plate, which is detachably mounted on the upper side of the core mold body by means of a fastener. The core mold cover plate is provided with a plurality of third mounting holes, each of which corresponds to a plurality of mandrels. The diameter of the mounting holes matches the outer diameter of the mandrels. The mandrels pass through their corresponding third mounting holes. A third mounting protrusion is provided at the lower end of each mandrel. The third mounting protrusion is located between the core mold cover plate and the core mold body. The core mold cover plate is used to clamp the third mounting protrusion and fix the mandrel.

[0009] A multi-cavity magnetic core forming device includes a fixed bracket, an upper mold driver, a middle mold driver, a core mold driver, and the aforementioned magnetic core forming mold. The lower mold is fixed to the fixed bracket, the upper mold is fixed to the output end of the upper mold driver, and the upper mold driver is used to drive the upper mold to reciprocate in a vertical direction. The middle mold is fixed to the output end of the middle mold driver, and the middle mold driver is used to drive the middle mold to reciprocate in a vertical direction. The core mold is fixed to the output end of the core mold driver, and the core mold driver is used to drive the core mold to reciprocate in a vertical direction. The upper mold driver is a hydraulic driver, and the middle mold driver and the core mold driver are servo motors.

[0010] Preferably, it also includes an upper mold support block, a middle mold support block, a lower mold support block, and a core mold support block; The upper mold support block is connected to the output end of the upper mold driver. The upper mold is detachably mounted on the upper mold support block by a locking member. The upper mold is fixed to the output end of the upper mold driver by the upper mold support block. The middle mold support block is connected to the output end of the middle mold driver. The middle mold is detachably mounted on the middle mold support block by a locking member. The middle mold is fixed to the output end of the middle mold driver by the middle mold support block. The core mold support block is connected to the output end of the core mold driver. The core mold is detachably mounted on the core mold support block by a locking member. The core mold is fixed to the output end of the core mold driver by the core mold support block. The lower mold support block is connected to the fixed bracket, and the lower mold is detachably installed on the lower mold support block by a locking member. The lower mold is fixed to the fixed bracket by the lower mold support block. Preferably, the lower die support block is located below the middle die support block, and the middle die support block has a fourth through hole in the middle part along the vertical direction. A plurality of the lower punch rods pass through the fourth through hole, and the projection of the fourth through hole completely covers the projection of the lower die in the vertical direction.

[0011] Preferably, a fifth through hole is provided in the middle of the lower mold support block along the vertical direction. The fifth through hole is a straight through hole. The inner circumference of the fifth through hole matches the outer circumference of the core mold support block. The core mold support block is disposed in the fifth through hole and can reciprocate along the fifth through hole.

[0012] Preferably, it further includes a support platform, a powder box, and a powder box driver. The support platform is connected to the intermediate mold, and the platform surface of the support platform is flush with the top surface of the intermediate mold body. The support platform is used to support the powder box, and the powder box driver is used to drive the powder box to reciprocate along the platform surface of the support platform and the top surface of the intermediate mold body for feeding.

[0013] The technical solution provided by this utility model can include the following beneficial effects: 1. By adopting a multi-cavity mold structure, the problem of low efficiency and limited production capacity of traditional single-cavity molds when pressing toroidal magnetic powder cores is fundamentally solved. By forming and pressing multiple magnetic cores simultaneously in one pressing action, production efficiency is greatly improved, enabling output to double or even several times within the same production time, and significantly reducing the production cost per unit product.

[0014] It can press out multiple products at once with similar size and performance data, and produce more products in the same production time while ensuring product batch stability, thus doubling or even several times the production efficiency.

[0015] 2. After the magnetic core is pressed, the upper punch moves upward while the lower punch remains stationary. The middle die and mandrel move downward. By aligning the top surface of the middle die body, the top surface of the mandrel, and the lower forming surface on the same horizontal plane, the problem of the magnetic core being difficult to demold smoothly after pressing or easily damaged during demolding is solved. This planar alignment method ensures the elimination of steps or uneven surfaces that hinder the smooth removal of the magnetic core, ensuring that the pressed toroidal magnetic core can slide easily and smoothly out of the mold cavity.

[0016] By achieving a smooth removal of the magnetic core, mechanical damage such as scratches, chipping, or deformation that may occur to the magnetic core during traditional demolding processes is effectively avoided. This not only protects the structural integrity and surface quality of the magnetic core but also indirectly maintains its expected magnetic properties, ensuring high product yield and consistency.

[0017] 3. By fixing the upper punch, lower punch, and mandrel as a whole, the overall structural stability and rigidity of the entire mold system are significantly enhanced. This integrated design ensures that all molding components maintain precise relative positions during the pressing process, effectively resisting deformation and vibration caused by high pressure, thereby solving the problems of component misalignment or uneven stress that may occur during the operation of multi-cavity molds.

[0018] Furthermore, this structural design simplifies the mold assembly and calibration process, improving installation efficiency. By providing a robust and unified support platform, the reliability of the mold is ensured under long-term high-intensity operation, reducing failures caused by component wear or loosening, thereby lowering maintenance costs and reducing downtime.

[0019] 4. By introducing a modular, detachable installation structure, a detachable and replaceable installation method is provided for the vulnerable parts of the mold and magnetic powder core contact area, while significantly enhancing the overall rigidity of the mold, thereby greatly reducing maintenance costs and downtime. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of a magnetic core forming mold according to an embodiment of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of a magnetic core forming mold according to an embodiment of the present invention.

[0022] Figure 3 This is a cross-sectional view of a magnetic core forming apparatus according to another embodiment of the present invention.

[0023] The components include: mandrel 11, mandrel body 12, mandrel cover plate 13, third mounting hole 131, lower punch 21, first through hole 211, lower forming surface 212, lower mold body 22, lower mold cover plate 23, second mounting hole 231, middle mold body 31, second through hole 311, mold sleeve 32, upper punch 41, open straight hole 411, upper forming surface 412, upper mold body 42, upper mold cover plate 43, first mounting hole 431, annular cavity 5, fixed bracket 6, mandrel support block 61, lower mold support block 62, fifth through hole 621, middle mold support block 63, fourth through hole 631, upper mold support block 64, support platform 71, and powder box 72. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0026] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] A multi-cavity magnetic core forming mold includes an upper mold, a middle mold, a lower mold, and a core mold. The core mold includes a plurality of core rods 11, each core rod 11 being a straight rod. The length direction of the core rods 11 is arranged in the vertical direction. The plurality of core rods 11 have the same size and are spaced apart in the horizontal direction. The lower die includes a plurality of lower punches 21, all of which are the same size. Each lower punch 21 is a hollow straight rod, and its length direction is vertical. A first through hole 211 is provided through the lower punch 21 in the vertical direction. Each of the lower punches 21 corresponds to a plurality of mandrels 11. The inner circumference of the first through hole 211 matches the outer circumference of the mandrel 11. Each of the mandrels 11 passes through the first through hole 211 and is inserted into its corresponding lower punch 21. The middle mold includes a middle mold body 31, and the middle mold body 31 is provided with a plurality of second through holes 311 in a vertical direction. The plurality of second through holes 311 have the same size and correspond one-to-one with the plurality of lower punch rods 21. The inner circumference of the second through hole 311 matches the outer circumference of the lower punch rod 21. The plurality of lower punch rods 21 are respectively inserted into their corresponding second through holes 311 through the second through holes 311. The upper die includes a plurality of upper punch rods 41, all of the same size. Each upper punch rod 41 is a hollow straight rod, and its length direction is vertical. Each upper punch rod 41 has a vertically opening straight hole 411 inside, with the opening of the straight hole 411 facing downward. Each of the upper punch rods 41 corresponds to a plurality of lower punch rods 21. Each of the upper punch rods 41 is positioned directly above its corresponding lower punch rod 21. The inner circumference of the straight hole 411 matches the outer circumference of the mandrel 11, and the outer circumference of the upper punch rod 41 matches the inner circumference of the second through hole 311. The top surface of the lower punch 21 is provided with a lower forming surface 212, and the bottom surface of the upper punch 41 is provided with an upper forming surface 412. When the upper mold, the middle mold, the lower mold and the core mold are closed, a plurality of corresponding upper punches 41, lower punches 21, second through holes 311 and core rods 11, the inner walls of a plurality of lower forming surfaces 212, a plurality of upper forming surfaces 412, a plurality of second through holes 311 and the outer walls of a plurality of core rods 11 enclose a plurality of closed annular cavities 5. The upper punch 41 and the lower punch 21 can move closer to or further away from each other in the vertical direction.

[0029] like Figure 1 and Figure 2 As shown, by adopting a multi-cavity mold structure, the problems of low efficiency and limited production capacity of traditional single-cavity molds in pressing toroidal magnetic powder cores are fundamentally solved. By forming and pressing multiple magnetic cores simultaneously in one pressing action, production efficiency is greatly improved, enabling output to double or even several times within the same production time, and significantly reducing the production cost per unit product.

[0030] It can press out multiple products at once with similar size and performance data, and produce more products in the same production time while ensuring product batch stability, thus doubling or even several times the production efficiency.

[0031] In one embodiment, before pressing begins, the upper punch 41 is in a high position, the upper forming surface 412 is away from the second through hole 311, and the lower forming surface 212, the inner wall of the second through hole 311 and the outer wall of the core mold form an upward-opening annular groove for filling powder. After the powder is filled, the upper punch 41 moves downward, and the upper forming surface 412 closes the opening of the annular groove to form a closed annular cavity 5. Then the upper punch 41 continues to move downward to press the powder into an annular magnetic powder core. After pressing is completed, the upper punch 41 moves upward, and the upper forming surface 412 moves away from the second through hole 311 again, so that the pressed magnetic powder core can be removed. The powder is filled again and the pressing action is repeated to achieve semi-continuous magnetic powder core pressing processing. Multiple annular cavities 5 are formed by multiple upper punches 41, multiple lower punches 21, multiple second through holes 311 and multiple core rods 11, so that multiple magnetic powder cores can be pressed in a single pressing action. The mold can produce several times more than a single cavity in the same production time, which greatly improves the production efficiency and solves the problem of low pressing efficiency of annular magnetic powder cores when using a single cavity mold.

[0032] Preferably, the top surface of the middle mold body 31, the top surface of the core rod 11, and the lower forming surface 212 are arranged parallel to each other. The middle mold body 31 and the core rod 11 can move in the vertical direction. After the magnetic core is pressed, the top surface of the middle mold body 31, the top surface of the core rod 11, and the lower forming surface 212 are located in the same plane.

[0033] like Figure 3 As shown, after the magnetic core is pressed, the upper punch moves upward while the lower punch remains stationary, and the middle die and mandrel move downward. By aligning the top surface of the middle die body 31, the top surface of the mandrel 11, and the lower forming surface 212 on the same horizontal plane, the problem of the magnetic core being difficult to demold smoothly after pressing or easily damaged during demolding is solved. This planar alignment method can ensure the elimination of steps or uneven surfaces that hinder the smooth removal of the magnetic core, ensuring that the pressed toroidal magnetic core can slide out of the mold cavity easily and smoothly.

[0034] By achieving a smooth removal of the magnetic core, mechanical damage such as scratches, chipping, or deformation that may occur to the magnetic core during traditional demolding processes is effectively avoided. This not only protects the structural integrity and surface quality of the magnetic core but also indirectly maintains its expected magnetic properties, ensuring high product yield and consistency.

[0035] Furthermore, this aligned demolding mechanism reduces wear on mold components during demolding, extends mold life, and lowers maintenance frequency and costs. Overall, this design improves the smoothness and reliability of mold operation, providing a crucial guarantee for the efficient and non-destructive production of magnetic cores.

[0036] Preferably, the upper die includes an upper die body 42, and a plurality of upper punches 41 are equally spaced along the circumference on the lower side of the upper die body 42; The lower die includes a lower die body 22, and a plurality of upper punches 41 are equally spaced along the circumference on the upper side of the lower die body 22; The core mold includes a core mold body 12, and a plurality of core rods 11 are arranged at equal intervals along the circumference on the upper side of the core mold body 12.

[0037] By fixing the upper punch 41, lower punch 21, and mandrel 11 as a whole, the overall structural stability and rigidity of the entire mold system are significantly enhanced. This integrated design ensures that all molding components maintain precise relative positions during the pressing process, effectively resisting deformation and vibration caused by high pressure, thereby solving the problems of component misalignment or uneven stress that may occur during the operation of multi-cavity molds.

[0038] Furthermore, this structural design simplifies the mold assembly and calibration process, improving installation efficiency. By providing a robust and unified support platform, the reliability of the mold is ensured under long-term high-intensity operation, reducing failures caused by component wear or loosening, thereby lowering maintenance costs and reducing downtime.

[0039] Preferably, the core mold body 12 is located below the lower mold body 22, and the lower mold body 22 is provided with a plurality of third through holes in the vertical direction, and a plurality of core rods 11 are inserted through the third through holes.

[0040] By using the third through hole to prevent the core rod 11 from being exposed, the mechanical interference problem between the core rod 11 and the lower mold body 22 during vertical movement is effectively solved.

[0041] Preferably, the upper mold includes an upper mold cover plate 43, which is detachably mounted on the lower side of the upper mold body 42 by means of a fastener. The upper mold cover plate 43 is provided with a plurality of first mounting holes 431, which correspond one-to-one with a plurality of upper punch rods 41. The diameter of the mounting hole matches the outer diameter of the upper punch rod 41. The plurality of upper punch rods 41 pass through their corresponding first mounting holes 431. The upper end of the upper punch rod 41 is provided with a first mounting protrusion ring, which is located between the upper mold cover plate 43 and the upper mold body 42. The upper mold cover plate 43 is used to clamp the first mounting protrusion ring and fix the upper punch rod 41. The lower die includes a lower die cover plate 23, which is detachably mounted on the upper side of the lower die body 22 by means of fasteners. The lower die cover plate 23 is provided with a plurality of second mounting holes 231, which correspond one-to-one with a plurality of lower punches 21. The diameter of the mounting hole matches the outer diameter of the lower punch 21. The plurality of lower punches 21 pass through their corresponding second mounting holes 231. The lower end of the lower punch 21 is provided with a second mounting protrusion ring, which is located between the lower die cover plate 23 and the lower die body 22. The lower die cover plate 23 is used to clamp the second mounting protrusion ring and fix the lower punch 21. The core mold includes a core mold cover plate 13, which is detachably mounted on the upper side of the core mold body 12 by means of fasteners. The core mold cover plate 13 is provided with a plurality of third mounting holes 131, which correspond one-to-one with a plurality of mandrels 11. The diameter of the mounting hole matches the outer diameter of the mandrel 11. The mandrels 11 pass through their corresponding third mounting holes 131. A third mounting protrusion is provided at the lower end of the mandrel 11. The third mounting protrusion is located between the core mold cover plate 13 and the core mold body 12. The core mold cover plate 13 is used to clamp the third mounting protrusion and fix the mandrel 11.

[0042] In a specific embodiment, the fixing element is a bolt, and the upper mold body 42, the lower mold body 22 and the core mold body 12 are provided with threaded holes that match the bolt.

[0043] By introducing a modular, detachable mounting structure, a detachable and replaceable mounting method is provided for vulnerable parts of the mold and magnetic powder core contact area, while significantly enhancing the overall rigidity of the mold, thereby greatly reducing maintenance costs and downtime.

[0044] A multi-cavity magnetic core forming device includes a fixed bracket 6, an upper mold driver, a middle mold driver, a core mold driver, and the aforementioned magnetic core forming mold. The lower mold is fixed to the fixed bracket 6, the upper mold is fixed to the output end of the upper mold driver, and the upper mold driver is used to drive the upper mold to reciprocate in the vertical direction. The middle mold is fixed to the output end of the middle mold driver, and the middle mold driver is used to drive the middle mold to reciprocate in the vertical direction. The core mold is fixed to the output end of the core mold driver, and the core mold driver is used to drive the core mold to reciprocate in the vertical direction. The upper mold driver is a hydraulic driver, and the middle mold driver and the core mold driver are servo motors.

[0045] By cleverly combining different types of actuators, the complex requirements for high-pressure driving force and high-precision positioning control during the core pressing process are solved. Using a hydraulic actuator to drive the upper mold, which interacts with the stationary lower mold, provides a powerful and stable pressing force, ensuring that the magnetic powder is fully and uniformly densified within the multi-cavity mold. This is crucial for forming high-density, high-performance magnetic cores.

[0046] Meanwhile, the use of servo motors in the intermediate mold driver and core mold driver provides excellent movement accuracy and repeatability. The servo motors can precisely control the vertical displacement of the intermediate mold and core mold, which is crucial for accurate positioning and smooth demolding of the magnetic core.

[0047] Preferably, it also includes an upper mold support block 64, a middle mold support block 63, a lower mold support block 62, and a core mold support block 61; The upper mold support block 64 is connected to the output end of the upper mold driver. The upper mold is detachably mounted on the upper mold support block 64 by a locking member. The upper mold is fixed to the output end of the upper mold driver by the upper mold support block 64. The middle mold support block 63 is connected to the output end of the middle mold driver. The middle mold is detachably installed on the middle mold support block 63 by a locking member. The middle mold is fixed to the output end of the middle mold driver by the middle mold support block 63. The core mold support block 61 is connected to the output end of the core mold driver. The core mold is detachably mounted on the core mold support block 61 by a locking member. The core mold is fixed to the output end of the core mold driver by the core mold support block 61. The lower mold support block 62 is connected to the fixed bracket 6. The lower mold is detachably installed on the lower mold support block 62 by a locking member. The lower mold is fixed to the fixed bracket 6 by the lower mold support block 62. The locking components consist of several bolts. The upper mold support block 64, the middle mold support block 63, the lower mold support block 62, and the core mold support block 61 are all provided with several threaded holes that match the bolts.

[0048] By employing an upper mold support block 64, a middle mold support block 63, a lower mold support block 62, and a core mold support block 61, and using locking components to achieve detachable connection of the mold, the structural rigidity and maintenance flexibility of the entire molding device are greatly enhanced.

[0049] Preferably, the intermediate mold further includes a mold sleeve 32, the intermediate mold body 31 is detachably embedded in the mold sleeve 32, and the mold sleeve 32 is installed on the intermediate mold support block by a number of bolts.

[0050] Preferably, the lower die support block 62 is located below the middle die support block 63. The middle die support block 63 has a fourth through hole 631 in the middle along the vertical direction. A plurality of the lower punch rods 21 pass through the fourth through hole 631, and the projection of the fourth through hole 631 completely covers the projection of the lower die in the vertical direction.

[0051] By setting a fourth through hole 631, mechanical interference between the lower punch 21 and the lower die and the middle die support block 63 during vertical movement is avoided.

[0052] Preferably, a fifth through hole 621 is provided in the middle of the lower mold support block 62 along the vertical direction. The fifth through hole 621 is a straight through hole. The inner circumference of the fifth through hole 621 matches the outer circumference of the core mold support block 61. The core mold support block 61 is disposed in the fifth through hole 621, and the core mold support block 61 can reciprocate along the fifth through hole 621.

[0053] The fifth through hole 621 effectively solves the problem of insufficient support stability of the core mold in the entire mold assembly due to its distance from the cavity and long transmission distance. The fifth through hole 621 provides circumferential guidance and support for the core mold support block 61, greatly enhancing its stability during vertical movement.

[0054] Preferably, it further includes a support platform 71, a powder box 72, and a powder box driver. The support platform 71 is connected to the intermediate mold, and the platform surface of the support platform 71 is flush with the top surface of the intermediate mold body 31. The support platform 71 is used to support the powder box 72, and the powder box driver is used to drive the powder box 72 to reciprocate along the platform surface of the support platform 71 and the top surface of the intermediate mold body 31 and to add powder.

[0055] By setting a support platform 71 that is flush with the top surface of the middle mold body 31, a flat and seamless moving plane is provided for the powder box 72, ensuring that the powder box 72 will not get stuck or tilt during reciprocating movement, thereby ensuring accurate filling of powder.

[0056] Other configurations and operations according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0057] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-cavity magnetic core forming mold, characterized in that: It includes an upper mold, a middle mold, a lower mold, and a core mold. The core mold includes several core rods, each of which is a straight rod. The length of each core rod is arranged vertically. The core rods are of the same size and are spaced apart horizontally. The lower die includes a plurality of lower punches, all of which are the same size. Each lower punch is a hollow straight rod, and its length is arranged vertically. A first through hole is provided through the lower punch in the vertical direction. Each of the lower punches corresponds to a plurality of mandrels. The inner circumference of the first through hole matches the outer circumference of the mandrel. Each of the mandrels passes through the first through hole and is inserted into its corresponding lower punch. The middle mold includes a middle mold body, and the middle mold body is provided with a plurality of second through holes in a vertical direction. The plurality of second through holes are of the same size, and the plurality of second through holes correspond one-to-one with the plurality of lower punches. The inner circumference of the second through hole matches the outer circumference of the lower punch, and the plurality of lower punches are respectively inserted into their corresponding second through holes. The upper die includes a plurality of upper punches, all of the same size. Each upper punch is a hollow straight rod, and its length is arranged vertically. Each upper punch has a vertically opening straight hole inside, with the opening facing downwards. The plurality of upper punches correspond one-to-one with a plurality of lower punches, and each upper punch is positioned directly above its corresponding lower punch. The inner circumference of the opening straight hole matches the outer circumference of the mandrel, and the outer circumference of the upper punch matches the inner circumference of the second through hole. The top surface of the lower punch is provided with a lower forming surface, and the bottom surface of the upper punch is provided with an upper forming surface. When the upper mold, the middle mold, the lower mold and the core mold are closed, a plurality of corresponding upper punches, lower punches, second through holes and core rods, a plurality of lower forming surfaces, a plurality of upper forming surfaces, a plurality of inner walls of the plurality of second through holes and a plurality of outer walls of the plurality of core rods enclose and form a plurality of closed annular cavities. The upper punches and lower punches can move closer to or further away from each other in the vertical direction.

2. The multi-cavity magnetic core forming mold according to claim 1, characterized in that: The top surface of the middle mold body, the top surface of the mandrel, and the lower forming surface are arranged parallel to each other. The middle mold body and the mandrel can move in the vertical direction. After the magnetic core is pressed, the top surface of the middle mold body, the top surface of the mandrel, and the lower forming surface are located on the same plane.

3. The multi-cavity magnetic core forming mold according to claim 1, characterized in that: The upper die includes an upper die body, and a plurality of upper punches are equally spaced along the circumference on the lower side of the upper die body; The lower die includes a lower die body, and a plurality of upper punches are equally spaced along the circumference on the upper side of the lower die body; The core mold includes a core mold body, and a plurality of core rods are arranged at equal intervals along the circumference on the upper side of the core mold body.

4. The multi-cavity magnetic core forming mold according to claim 3, characterized in that: The core mold body is located below the lower mold body. The lower mold body has several third through holes along the vertical direction, and several core rods are inserted through the third through holes.

5. A multi-cavity magnetic core forming mold according to claim 3, characterized in that: The upper mold includes an upper mold cover plate, which is detachably mounted on the lower side of the upper mold body by means of a fastener. The upper mold cover plate is provided with a plurality of first mounting holes, which correspond one-to-one with a plurality of upper punches. The diameter of the mounting holes matches the outer diameter of the upper punches. The plurality of upper punches pass through their corresponding first mounting holes. The upper end of the upper punch is provided with a first mounting protrusion ring, which is located between the upper mold cover plate and the upper mold body. The upper mold cover plate is used to clamp the first mounting protrusion ring and fix the upper punches. The lower die includes a lower die cover plate, which is detachably mounted on the upper side of the lower die body by means of a fastener. The lower die cover plate is provided with a plurality of second mounting holes, which correspond one-to-one with a plurality of lower punches. The diameter of the mounting holes matches the outer diameter of the lower punches. The lower punches pass through their corresponding second mounting holes. The lower end of each lower punch is provided with a second mounting protrusion ring, which is located between the lower die cover plate and the lower die body. The lower die cover plate is used to clamp the second mounting protrusion ring and fix the lower punches. The core mold includes a core mold cover plate, which is detachably mounted on the upper side of the core mold body by means of a fastener. The core mold cover plate is provided with a plurality of third mounting holes, each of which corresponds to a plurality of mandrels. The diameter of the mounting holes matches the outer diameter of the mandrels. The mandrels pass through their corresponding third mounting holes. A third mounting protrusion is provided at the lower end of each mandrel. The third mounting protrusion is located between the core mold cover plate and the core mold body. The core mold cover plate is used to clamp the third mounting protrusion and fix the mandrel.

6. A multi-cavity magnetic core forming device, characterized in that: The device includes a fixed bracket, an upper mold driver, a middle mold driver, a core mold driver, and a magnetic core forming mold as described in any one of claims 1-5. The lower mold is fixed to the fixed bracket, the upper mold is fixed to the output end of the upper mold driver, and the upper mold driver is used to drive the upper mold to reciprocate in a vertical direction. The middle mold is fixed to the output end of the middle mold driver, and the middle mold driver is used to drive the middle mold to reciprocate in a vertical direction. The core mold is fixed to the output end of the core mold driver, and the core mold driver is used to drive the core mold to reciprocate in a vertical direction. The upper mold driver is a hydraulic driver, and the middle mold driver and the core mold driver are servo motors.

7. The multi-cavity magnetic core forming device according to claim 6, characterized in that: It also includes an upper mold support block, a middle mold support block, a lower mold support block, and a core mold support block; The upper mold support block is connected to the output end of the upper mold driver. The upper mold is detachably mounted on the upper mold support block by a locking member. The upper mold is fixed to the output end of the upper mold driver by the upper mold support block. The middle mold support block is connected to the output end of the middle mold driver. The middle mold is detachably mounted on the middle mold support block by a locking member. The middle mold is fixed to the output end of the middle mold driver by the middle mold support block. The core mold support block is connected to the output end of the core mold driver. The core mold is detachably mounted on the core mold support block by a locking member. The core mold is fixed to the output end of the core mold driver by the core mold support block. The lower mold support block is connected to the fixed bracket. The lower mold is detachably installed on the lower mold support block by a locking member. The lower mold is fixed to the fixed bracket by the lower mold support block.

8. The multi-cavity magnetic core forming device according to claim 7, characterized in that: The lower die support block is located below the middle die support block. The middle die support block has a fourth through hole in the middle part along the vertical direction. Several lower punch rods pass through the fourth through hole and are arranged in the vertical direction. The projection of the fourth through hole completely covers the projection of the lower die.

9. The multi-cavity magnetic core forming device according to claim 7, characterized in that: The lower mold support block has a fifth through hole in the middle along the vertical direction. The fifth through hole is a straight through hole. The inner circumference of the fifth through hole matches the outer circumference of the core mold support block. The core mold support block is disposed in the fifth through hole and can reciprocate along the fifth through hole.

10. A multi-cavity magnetic core forming apparatus according to claim 6, characterized in that: It also includes a support platform, a powder box, and a powder box driver. The support platform is connected to the intermediate mold, and the platform surface of the support platform is flush with the top surface of the intermediate mold body. The support platform is used to support the powder box, and the powder box driver is used to drive the powder box to reciprocate along the platform surface of the support platform and the top surface of the intermediate mold body for feeding.

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