Pressing die assembly of annular magnetic core

Abstract

The utility model relates to the technical field of pressing dies, and discloses an annular magnetic core pressing die assembly which comprises a base and an annular upper die, a connecting frame is fixedly connected to the upper surface of the base, a hydraulic cylinder is fixedly connected to the interior of the connecting frame, and the output end of the hydraulic cylinder is fixedly connected with a fixing plate. A connecting plate is fixedly connected to the inner wall of the base, a fixed rod is fixedly connected to the upper surface of the connecting plate, a demolding assembly is arranged in the connecting plate and used for demolding the pressed annular magnetic core, and a guide assembly is arranged on the lower surface of the fixed plate and used for guaranteeing the stability of downward pressing of the annular upper mold. The demolding assembly comprises an electric telescopic rod. According to the annular magnetic core demolding device, safe demolding of the annular magnetic core is achieved, waste of raw materials and cost for follow-up processing of defective products are reduced, the situation that density is inconsistent in the annular magnetic core formed through pressing is effectively prevented, and the production quality of the annular magnetic core is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressing dies, in particular to a pressing die assembly for an annular magnetic core. Background Art

[0002] Magnetic cores play a crucial role in the field of electronic components. They are a type of magnetic metal oxide, made from a mixture of various iron oxides through a specific sintering process. This material possesses unique magnetic properties that meet the electromagnetic performance requirements of electronic devices in various operating scenarios, making it widely used as a fundamental functional material in electronic components.

[0003] To meet these requirements, it is usually necessary to use molds of different shapes and structures to manufacture magnetic cores through compression molding. The existing compression mold assembly generally consists of an upper mold, a lower mold, a middle mold, and a core rod. During the manufacturing process, magnetic powder must first be injected into the filling cavity surrounded by the middle mold, lower mold, and core rod. Then, the upper mold is used to press the magnetic powder into a magnetic core, and finally, the formed magnetic core is squeezed out of the mold.

[0004] However, traditional annular magnetic core pressing mold assemblies have some problems when removing the mold. The traditional demolding method relies on some simple push rods or ejector pin structures in the mold assembly to push the core out. During the extrusion molding process of the magnetic core, only some areas of the mold components may start to move first, which will cause the magnetic core to be subjected to uneven external forces. This uneven external force will cause the magnetic core to be partially over-extruded, resulting in scratches, cracks or deformation, etc., and ultimately lead to a large number of defective products. This not only increases production costs, but also affects production efficiency and product quality. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a pressing mold assembly for an annular magnetic core, which aims to improve the problem that the traditional pressing mold assembly for annular magnetic core is easily damaged by external force when removing the model, thereby reducing production efficiency and product quality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressing mold assembly of an annular magnetic core, comprising a base and an annular upper mold, the upper surface of the base is fixedly connected to a connecting frame, the connecting frame is fixedly connected to a hydraulic cylinder, the output end of the hydraulic cylinder is fixedly connected to a fixing plate, the inner wall of the base is fixedly connected to the connecting plate, the upper surface of the connecting plate is fixedly connected to a fixed rod, a demolding assembly is provided inside the connecting plate, and the demolding assembly is used to demold the pressed annular magnetic core, the lower surface of the fixed plate is provided with a guide assembly, and the guide assembly is used to ensure the stability of the downward pressure of the annular upper mold, the demolding assembly comprises an electric telescopic rod, the outer wall of the electric telescopic rod is fixedly connected to the inside of the connecting plate, the output end of the electric telescopic rod is fixedly connected to a tubular middle mold, the inside of the tubular middle mold is fixedly connected to a core rod, the outer wall of the core rod is slidably connected to an annular lower mold, and the lower surface of the annular lower mold is fixedly connected to the upper surface of the fixed rod.

[0007] Furthermore, the guide assembly includes a guide column, the upper surface of which is fixedly connected to the lower surface of the fixed plate, a guide groove is provided inside the base, the outer wall of the guide column is slidably connected to the inner wall of the guide groove, and the lower surface of the guide column is fixedly connected to a limiting block.

[0008] Furthermore, a limiting rod is fixedly connected to the upper surface of the annular upper mold, and a collar is fixedly connected to the outer wall of the limiting rod.

[0009] Furthermore, a storage layer is provided inside the sleeve ring, and an inner wall of the storage layer is slidably connected to an outer wall of the annular upper mold.

[0010] Furthermore, a connecting rod is fixedly connected to the upper surface of the collar, and the upper surface of the connecting rod is fixedly connected to the lower surface of the fixing plate.

[0011] Furthermore, a spring is sleeved on the outer wall of the fixed rod.

[0012] Furthermore, one end of the spring is fixedly connected to the upper surface of the connecting plate, and the other end of the spring is fixedly connected to the lower surface of the tubular middle mold.

[0013] Furthermore, a notch is provided inside the base, and an annular gasket is fixedly connected to the upper surface of the annular lower mold.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, the fixed plate is driven downward by the hydraulic cylinder, thereby driving the annular upper mold to move downward. At the same time, the sliding arrangement of the guide column in the guide groove ensures the stability of the downward pressure of the annular upper mold, thereby improving the accuracy and efficiency of the pressing. The electric telescopic rod drives the tubular middle mold and the core rod to move downward, so that the tubular middle mold can slide downward along the outer wall of the fixed rod. At the same time, the squeezing and contraction of the spring effectively prevents the tubular middle mold from moving downward too quickly, thereby damaging the demoulding of the magnetic core. As the tubular middle mold continues to move downward, the annular magnetic core pressed and formed on the upper surface of the fixed rod is exposed, thereby achieving safe demoulding of the annular magnetic core and reducing the waste of raw materials and the cost of subsequent processing of defective products.

[0016] 2. In the present invention, the fixed plate is driven downward by the hydraulic cylinder, so that the sleeve will also move into the tubular middle mold, thereby squeezing the air on the inner wall of the tubular middle mold, so that the air can be discharged through the gap between the sleeve and the annular upper mold. When the annular upper mold moves to the surface of the magnetic core, the annular upper mold will be squeezed by the magnetic core and move upward. Then, through the setting of the limiting rod, the annular upper mold will slide upward along the outer wall of the limiting rod until the annular upper mold moves to the storage layer, thereby realizing the air exhaust operation before pressing the magnetic core, effectively preventing the density inconsistency inside the pressed annular magnetic core, and greatly improving the production quality of the annular magnetic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a pressing die assembly for a ring-shaped magnetic core proposed in the present invention;

[0018] Figure 2 This is a schematic diagram of the connecting plate structure of a pressing die assembly of a ring-shaped magnetic core proposed in the present invention;

[0019] Figure 3 This is a schematic diagram of the connecting frame structure of a pressing die assembly of a ring-shaped magnetic core proposed in the present invention;

[0020] Figure 4 This is a schematic diagram of the guide groove structure of a pressing die assembly for an annular magnetic core proposed in the present invention.

[0021] Legend:

[0022] 1. Base; 2. Hydraulic cylinder; 3. Connecting frame; 4. Annular upper die; 5. Tubular middle die; 6. Mandrel; 7. Annular lower die; 8. Connecting plate; 9. Electric telescopic rod; 10. Fixed rod; 11. Spring; 12. Limit rod; 13. Storage layer; 14. Guide column; 15. Limit block; 16. Ring; 17. Fixed plate; 18. Notch; 19. Guide groove; 20. Connecting rod; 21. Annular gasket. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Reference Figure 1 - Figure 3 The utility model provides an embodiment: a pressing die assembly for an annular magnetic core, comprising a base 1 and an annular upper die 4, a connecting frame 3 being fixedly connected to the upper surface of the base 1, a hydraulic cylinder 2 being fixedly connected to the interior of the connecting frame 3, a fixed plate 17 being fixedly connected to the output end of the hydraulic cylinder 2, when the annular magnetic core is produced using the die, magnetic powder is first evenly filled into the annular space formed between the annular gasket 21, the core rod 6, and the tubular middle die 5, and then the hydraulic cylinder 2 is started, which can drive the fixed plate 17 to move downward, thereby driving the annular upper die 4 below it to move downward, and at the same time, the fixed plate 17 is pressed against the fixing plate 17. A guide assembly is provided on the lower surface, and the guide assembly includes a guide column 14. The upper surface of the guide column 14 is fixedly connected to the lower surface of the fixed plate 17. A guide groove 19 is provided inside the base 1. The outer wall of the guide column 14 is slidably connected to the inner wall of the guide groove 19. The lower surface of the guide column 14 is fixedly connected to the limit block 15. A guide assembly is provided under the fixed plate 17, so that the guide column 14 can slide in the guide groove 19 inside the base 1, thereby ensuring the stability of the downward pressure of the annular upper mold 4. As the annular upper mold 4 continues to move downward, the annular upper mold 4 will move into the annular magnetic powder filling chamber between the core rod 6 and the tubular middle mold 5, and The annular gasket 21, the core rod 6, and the tubular middle mold 5 together press the magnetic powder into an annular magnetic core. The inner wall of the base 1 is fixedly connected to a connecting plate 8, and the upper surface of the connecting plate 8 is fixedly connected to a fixed rod 10. A demoulding component is provided inside the connecting plate 8. The demoulding component is used to demould the annular magnetic core after the pressing is completed. When the annular magnetic core is pressed, the demoulding work of the annular magnetic core needs to be carried out. The electric telescopic rod 9 is started to work. The outer wall of the electric telescopic rod 9 is fixedly connected to the inside of the connecting plate 8. The electric telescopic rod 9 can drive the tubular middle mold 5 and the core rod 6 to move downward, and the tubular middle mold 5 will slide downward along the outer wall of the fixed rod 10, thereby The spring 11 is squeezed and contracted, and the spring 11 can generate a buffering force for the downward movement of the tubular middle mold 5, thereby effectively preventing the tubular middle mold 5 from moving down too quickly and causing damage to the magnetic core demolding. As the tubular middle mold 5 continues to move downward, the annular lower mold 7 and the pressed annular magnetic core on the upper surface of the fixed rod 10 will be exposed, thereby realizing the demolding of the annular magnetic core. The demolding assembly includes an electric telescopic rod 9, the output end of the electric telescopic rod 9 is fixedly connected to the tubular middle mold 5, the inside of the tubular middle mold 5 is fixedly connected to the core rod 6, the outer wall of the core rod 6 is slidably connected to the annular lower mold 7, and the lower surface of the annular lower mold 7 is fixedly connected to the upper surface of the fixed rod 10.

[0025] Reference Figure 2 - Figure 4 , the upper surface of the annular upper mold 4 is fixedly connected to the limit rod 12, and an air exhaust component is arranged above the annular upper mold 4, the outer wall of the limit rod 12 is fixedly connected with a collar 16, the upper surface of the collar 16 is fixedly connected with a connecting rod 20, and the upper surface of the connecting rod 20 is fixedly connected to the lower surface of the fixed plate 17. When the hydraulic cylinder 2 drives the fixed plate 17 to move downward, due to the connection effect of the connecting rod 20, the collar 16 below it will also be driven to move downward. A storage layer 13 is provided inside the collar 16, and the inner wall of the storage layer 13 is slidably connected to the outer wall of the annular upper mold 4. As the collar 16 moves downward, when the collar 16 moves to the inner wall of the tubular middle mold 5, the air on the inner wall of the tubular middle mold 5 will be squeezed. At this time, the air will be discharged through the gap between the collar 16 and the annular upper mold 4, which can effectively In order to prevent the occurrence of inconsistent density inside the pressed annular magnetic core, a spring 11 is provided on the outer wall of the fixed rod 10, one end of the spring 11 is fixedly connected to the upper surface of the connecting plate 8, and the other end of the spring 11 is fixedly connected to the lower surface of the tubular middle mold 5. A slot 18 is provided inside the base 1. As the annular upper mold 4 moves to the surface of the magnetic core, under the extrusion of the magnetic core of the annular upper mold 4, the annular upper mold 4 will also move upward, and through the setting of the limiting rod 12, the annular upper mold 4 will slide upward along the outer wall of the limiting rod 12, and then the annular upper mold 4 will move to the storage layer 13 inside the ring 16, thereby realizing the air exhaust operation before pressing the magnetic core. The upper surface of the annular lower mold 7 is fixedly connected to the annular gasket 21, and the magnetic core is transferred to the sintering furnace for calcination through the annular gasket 21.

[0026] Working principle: When using the device, first, magnetic powder is evenly loaded into the annular space formed between the annular gasket 21, the core rod 6, and the tubular middle die 5, and then the hydraulic cylinder 2 is started. The hydraulic cylinder 2 can drive the fixed plate 17 to move downward, and then drive the annular upper die 4 below it to move downward. At the same time, a guide assembly is provided under the fixed plate 17, so that the guide column 14 can slide in the guide groove 19 inside the base 1, thereby ensuring the stability of the downward pressure of the annular upper die 4. As the annular upper die 4 continues to move downward, the annular upper die 4 will move into the annular magnetic powder filling chamber between the core rod 6 and the tubular middle die 5, and together with the annular gasket 21, the core rod 6, and the tubular middle die 5, press the magnetic powder into an annular magnetic core;

[0027] When the annular magnetic core is pressed, it is necessary to demould the annular magnetic core, and the electric telescopic rod 9 is started to work. The electric telescopic rod 9 can drive the tubular middle mold 5 and the core rod 6 to move downward, and the tubular middle mold 5 will slide downward along the outer wall of the fixed rod 10, so that the spring 11 is squeezed and contracted. The spring 11 can generate a buffering force for the downward movement of the tubular middle mold 5, thereby effectively preventing the tubular middle mold 5 from moving down too quickly and causing damage to the demoulding of the magnetic core. As the tubular middle mold 5 continues to move downward, the annular lower mold 7 on the upper surface of the fixed rod 10 and the pressed annular magnetic core are exposed, thereby realizing demoulding of the annular magnetic core. At this time, the magnetic core can be transferred to the sintering furnace for calcination through the annular gasket 21;

[0028] An air exhaust component is arranged above the annular upper mold 4. When the hydraulic cylinder 2 drives the fixed plate 17 to move downward, it will also drive the ring 16 below it to move downward. As the ring 16 moves downward, when the ring 16 moves to the inner wall of the tubular middle mold 5, the air on the inner wall of the tubular middle mold 5 will be squeezed. At this time, the air will be discharged through the gap between the ring 16 and the annular upper mold 4, thereby effectively preventing the density inconsistency inside the pressed annular magnetic core. As the annular upper mold 4 moves to the surface of the magnetic core, the annular upper mold 4 will also move upward under the extrusion of the magnetic core, and through the setting of the limit rod 12, the annular upper mold 4 will slide upward along the outer wall of the limit rod 12, and then the annular upper mold 4 will move to the storage layer 13 inside the ring 16, thereby realizing the air exhaust operation before pressing the magnetic core.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressing die assembly for an annular magnetic core, comprising a base (1) and an annular upper die (4), characterized in that: The upper surface of the base (1) is fixedly connected to a connecting frame (3), the interior of the connecting frame (3) is fixedly connected to a hydraulic cylinder (2), the output end of the hydraulic cylinder (2) is fixedly connected to a fixed plate (17), the inner wall of the base (1) is fixedly connected to a connecting plate (8), the upper surface of the connecting plate (8) is fixedly connected to a fixed rod (10), a demoulding assembly is provided inside the connecting plate (8), the demoulding assembly is used to demould the annular magnetic core after pressing, and a guide assembly is provided on the lower surface of the fixed plate (17), the guide assembly is used to ensure the stability of the downward pressing of the annular upper mold (4); The demoulding assembly comprises an electric telescopic rod (9), the outer wall of the electric telescopic rod (9) is fixedly connected to the inside of the connecting plate (8), the output end of the electric telescopic rod (9) is fixedly connected to a tubular middle mold (5), the inside of the tubular middle mold (5) is fixedly connected to a core rod (6), the outer wall of the core rod (6) is slidably connected to an annular lower mold (7), and the lower surface of the annular lower mold (7) is fixedly connected to the upper surface of the fixed rod (10).

2. The pressing die assembly for an annular magnetic core according to claim 1, characterized in that: The guide assembly comprises a guide column (14), the upper surface of the guide column (14) is fixedly connected to the lower surface of the fixed plate (17), a guide groove (19) is provided inside the base (1), the outer wall of the guide column (14) is slidably connected to the inner wall of the guide groove (19), and the lower surface of the guide column (14) is fixedly connected to the limit block (15).

3. The pressing die assembly for an annular magnetic core according to claim 1, wherein: The upper surface of the annular upper die (4) is fixedly connected to a limiting rod (12), and the outer wall of the limiting rod (12) is fixedly connected to a collar (16).

4. The pressing die assembly for an annular magnetic core according to claim 3, characterized in that: A storage layer (13) is provided inside the sleeve ring (16), and the inner wall of the storage layer (13) is slidably connected to the outer wall of the annular upper mold (4).

5. The pressing die assembly for an annular magnetic core according to claim 3, characterized in that: The upper surface of the collar (16) is fixedly connected to a connecting rod (20), and the upper surface of the connecting rod (20) is fixedly connected to the lower surface of the fixing plate (17).

6. The pressing die assembly for an annular magnetic core according to claim 1, characterized in that: The outer wall of the fixed rod (10) is sleeved with a spring (11).

7. The pressing die assembly for an annular magnetic core according to claim 6, characterized in that: One end of the spring (11) is fixedly connected to the upper surface of the connecting plate (8), and the other end of the spring (11) is fixedly connected to the lower surface of the tubular middle mold (5).

8. The pressing die assembly for an annular magnetic core according to claim 1, characterized in that: A notch (18) is provided inside the base (1), and an annular gasket (21) is fixedly connected to the upper surface of the annular lower mold (7).

Images