Permanent magnetic ferrite magnetic shoe forming die capable of inhibiting generation of invisible cracks

Abstract

The utility model discloses a permanent magnetic ferrite magnetic shoe forming die capable of inhibiting generation of invisible cracks, which comprises an upper die, a middle die and a lower male die, a base is arranged on the bottom surface of the lower male die, a buffer block is arranged between the lower male die and the base, a through hole is arranged in the buffer block, a first spring is arranged in the through hole, and a second spring is arranged in the first spring. The two ends of the first spring are fixed to the lower male die and the base correspondingly. The buffer block and the first spring are arranged below the lower male die, so that when the upper die is pressed downwards, the buffer block and the first spring can absorb impact and relieve instant impact of forming pressure on a magnetic tile blank, stress concentration caused by rigid contact is avoided, and invisible cracks in the magnetic tile blank are reduced. The limiting columns are arranged to limit the deformation quantity of the buffer blocks and the first springs, normal forming of the magnetic shoe is prevented from being influenced by excessive deformation, and meanwhile, the elastic pads are arranged below the limiting columns to prevent the limiting columns from causing impact when making contact with the base to influence forming of the magnetic shoe.

Description

Technical Field

[0001] This utility model relates to a molding die for permanent magnet ferrite tiles that suppresses the generation of hidden cracks. Background Technology

[0002] Permanent magnet ferrite materials occupy an extremely important position in modern industry and technology due to their many advantages, such as good magnetic properties, high coercivity, low cost, and stable chemical properties. Among them, permanent magnet ferrite tiles, as a common magnetic component, are widely used in various electromagnetic devices such as motors, generators, transformers, sensors, and magnetic chucks.

[0003] In the molding process of permanent magnet ferrite tiles, the pressing operation of the mold is a crucial step in applying pressure to shape the powder. However, traditional molds typically use direct mechanical pressure to rapidly compress the powder during pressing, lacking buffer devices or slow-release structures. This instantaneous high-speed pressing generates significant impact stress between powder particles. Due to the inherent brittleness of permanent magnet ferrite materials, this instantaneous impact stress can easily exceed the material's compressive strength, thus forming hidden cracks within the blank. Utility Model Content

[0004] The main purpose of this invention is to provide a mold for forming permanent magnet ferrite tiles that suppresses the generation of hidden cracks, so as to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved by adopting the following technical solution:

[0006] A mold for forming permanent magnet ferrite tiles that suppresses the generation of hidden cracks includes an upper mold, a middle mold, and a lower punch. A base is provided on the bottom surface of the lower punch, and a buffer block is provided between the lower punch and the base. A through hole is provided in the buffer block, and a first spring is provided in the through hole. The two ends of the first spring are respectively fixed to the lower punch and the base.

[0007] Preferably, the bottom surface of the lower punch is provided with a limiting post inserted into the first spring, and the length of the limiting post is less than the thickness of the buffer block.

[0008] Preferably, the base has a groove below the limiting post, and an elastic pad is provided in the groove.

[0009] Preferably, four through holes are provided, and the four through holes are respectively located at the four corners of the buffer block.

[0010] Preferably, pressure plates are provided on both sides of the upper mold, and a telescopic rod is provided between the pressure plates and the base, with a second spring inside the telescopic rod.

[0011] Preferably, a connecting plate is provided behind the middle mold, and a hydraulic cylinder is provided below the connecting plate.

[0012] Preferably, a slider is provided on the outer wall of the intermediate mold along its height direction, and a support plate is provided on the base on the outer side of the intermediate mold, and a groove is provided on the inner wall of the support plate along its length direction.

[0013] Preferably, the top surface of the support plate is provided with an inwardly bent limiting plate.

[0014] Preferably, the top surface of the limiting plate is provided with a buffer pad.

[0015] The beneficial technical effects of this utility model are as follows:

[0016] 1. This utility model provides a buffer block and a first spring installed below the lower punch. When the upper die is pressed down, the buffer block and the first spring absorb the impact, reducing the instantaneous impact of the forming pressure on the magnetic tile blank. This avoids stress concentration caused by rigid contact and reduces the generation of hidden cracks inside the magnetic tile blank. By setting a limiting post, the deformation of the buffer block and the first spring is limited, preventing excessive deformation from affecting the normal forming of the magnetic tile. Simultaneously, an elastic pad is installed below the limiting post to prevent impact from the limiting post when it contacts the base, thus affecting the forming of the magnetic tile.

[0017] 2. This utility model provides second springs on both sides of the upper mold and a buffer pad on the top surface of the limiting plate, so that the upper mold can be buffered when it is pressed down, reducing the impact force generated when it is pressed down, and further suppressing the generation of hidden cracks in the magnetic tile. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front structure of the mold according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the back structure of the mold according to an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the mold according to an embodiment of the present invention;

[0021] Figure 4 This is an exploded view of the lower punch, buffer block, and base according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the base structure of an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the middle mold structure in an embodiment of the present invention.

[0024] In the diagram: 1. Upper mold; 2. Middle mold; 3. Lower punch; 4. Base; 5. Buffer block; 6. Through hole; 7. First spring; 8. Limiting post; 9. Groove; 10. Elastic pad; 11. Pressure plate; 12. Telescopic rod; 13. Second spring; 14. Connecting plate; 15. Hydraulic cylinder; 16. Slider; 17. Support plate; 18. Slide groove; 19. Limiting plate; 20. Buffer pad. Detailed Implementation

[0025] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0026] like Figures 1-6 As shown, the permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks provided in this embodiment includes an upper mold 1, a middle mold 2 and a lower punch 3. A base 4 is provided on the bottom surface of the lower punch 3. A buffer block 5 is provided between the lower punch 3 and the base 4. A through hole 6 is provided in the buffer block 5. A first spring 7 is provided in the through hole 6. The two ends of the first spring 7 are respectively fixed on the lower punch 3 and the base 4.

[0027] When the upper mold 1 is pressed down, the buffer block 5 and the first spring 7 can absorb the impact, reduce the instantaneous impact of the forming pressure on the magnetic tile blank, avoid stress concentration caused by rigid contact, and reduce the generation of hidden cracks inside the magnetic tile blank.

[0028] In this embodiment, as Figure 4 As shown, the bottom surface of the lower punch 3 is provided with a limiting post 8 inserted into the first spring 7. The length of the limiting post 8 is less than the thickness of the buffer block 5, which limits the downward stroke of the lower punch 3 and prevents the first spring 7 from being over-compressed, thus affecting the normal forming of the magnetic tile.

[0029] In this embodiment, as Figure 4 As shown, a groove 9 is provided on the base 4 below the limiting post 8, and an elastic pad 10 is provided in the groove 9. When the limiting post 8 contacts the base 4, the elastic pad 10 absorbs the impact and prevents the impact between the limiting post 8 and the base 4 from affecting the forming of the magnetic tile.

[0030] In this embodiment, as Figure 4 As shown, there are four through holes 6, which are respectively located at the four corners of the buffer block 5. The first springs 7 distributed at the four corners achieve uniform buffering and ensure the buffering effect.

[0031] In this embodiment, as Figure 3 As shown, pressure plates 11 are provided on both sides of the upper mold 1, and a telescopic rod 12 is provided between the pressure plate 11 and the base 4. A second spring 13 is provided inside the telescopic rod 12 to absorb lateral impact force and reduce the risk of hidden cracks on the edge of the magnetic tile blank.

[0032] In this embodiment, as Figure 2 As shown, a connecting plate 14 is provided behind the middle mold 2, and a hydraulic cylinder 15 is provided below the connecting plate 14. After molding is completed, the hydraulic cylinder 15 is activated to move the middle mold 2 down, demolding the molded magnetic tile for easy removal.

[0033] In this embodiment, as Figure 5 and Figure 6 As shown, a slider 16 is provided on the outer wall of the middle mold 2 along its height direction, and a support plate 17 is provided on the base 4 on the outer side of the middle mold 2. A groove 18 is provided on the inner wall of the support plate 17 along its length direction to ensure that the middle mold 2 moves vertically and to ensure that the demolding process is carried out smoothly.

[0034] In this embodiment, as Figure 5 As shown, the top surface of the support plate 17 is provided with an inwardly bent limiting plate 19 to limit the stroke of the middle mold 2 and ensure that the middle mold 2 is in the correct position during the magnetic tile forming process.

[0035] In this embodiment, as Figure 1 As shown, the top surface of the limiting plate 19 is provided with a buffer pad 20. When the upper mold 1 is pressed down, it first contacts the buffer pad 20 and then gradually squeezes downward, further improving the buffering effect and suppressing the generation of invisible cracks in the magnetic tile.

[0036] In summary, in this embodiment, by setting a buffer block 5 and a first spring 7 below the lower punch 3, the buffer block 5 and the first spring 7 can absorb the impact when the upper die 1 is pressed down, reducing the instantaneous impact of the forming pressure on the magnetic tile blank, avoiding stress concentration caused by rigid contact, and reducing the generation of hidden cracks inside the magnetic tile blank. By setting a limiting post 8, the deformation of the buffer block 5 and the first spring 7 is limited to prevent excessive deformation from affecting the normal forming of the magnetic tile. At the same time, an elastic pad 10 is set below the limiting post 8 to prevent the limiting post 8 from causing impact when it contacts the base 4, thus affecting the forming of the magnetic tile.

[0037] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A molding die for permanent magnet ferrite tiles that suppresses the generation of hidden cracks, characterized in that: It includes an upper mold (1), a middle mold (2) and a lower punch (3). The bottom surface of the lower punch (3) is provided with a base (4). A buffer block (5) is provided between the lower punch (3) and the base (4). A through hole (6) is provided in the buffer block (5). A first spring (7) is provided in the through hole (6). The two ends of the first spring (7) are fixed on the lower punch (3) and the base (4) respectively.

2. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 1, characterized in that: The bottom surface of the lower punch (3) is provided with a limiting post (8) inserted into the first spring (7), and the length of the limiting post (8) is less than the thickness of the buffer block (5).

3. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 2, characterized in that: The base (4) has a groove (9) below the limiting post (8), and an elastic pad (10) is provided in the groove (9).

4. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 1, characterized in that: Four through holes (6) are provided, and the four through holes (6) are respectively located at the four corners of the buffer block (5).

5. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 1, characterized in that: The upper mold (1) is provided with pressure plates (11) on both sides, and a telescopic rod (12) is provided between the pressure plate (11) and the base (4). A second spring (13) is provided inside the telescopic rod (12).

6. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 1, characterized in that: A connecting plate (14) is provided behind the middle mold (2), and a hydraulic cylinder (15) is provided below the connecting plate (14).

7. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 6, characterized in that: A slider (16) is provided on the outer wall of the middle mold (2) along its height direction, and a support plate (17) is provided on the base (4) on the outer side of the middle mold (2), and a groove (18) is provided on the inner wall of the support plate (17) along its length direction.

8. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 7, characterized in that: The top surface of the support plate (17) is provided with an inwardly bent limiting plate (19).

9. The permanent magnet ferrite tile forming mold for suppressing the generation of hidden cracks according to claim 8, characterized in that: The top surface of the limiting plate (19) is provided with a buffer pad (20).

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