Permanent magnetic ferrite wet-pressing magnetic shoe mold

Abstract

The invention relates to the technical field of permanent magnetic ferrite product production, and particularly discloses a permanent magnetic ferrite wet-pressing magnetic shoe mold which comprises a middle mold, an upper mold and a lower punching mold, a middle mold outer arc, a middle mold outer arc bevel edge and a middle mold plane are arranged in the middle mold, the middle mold is provided with a cavity, and the cavity is provided with a material injection port; an upper die outer arc, an upper die outer arc bevel edge and an upper die plane are arranged in the upper die, an arc-shaped top face is arranged in the upper die, and a water pumping groove is formed in the upper die. The die comprises a middle die, an upper die and a lower stamping die, in the assembling process of the middle die, the upper die and the lower stamping die, in the upper die outer arc, the upper die outer arc bevel edge, the upper die transition fillet and the upper die plane sequentially correspond to the middle die outer arc, the middle die outer arc bevel edge, the middle die transition fillet and the middle die plane in an up-down mode through the upper die outer arc, the upper die outer arc bevel edge, the upper die transition fillet and the upper die plane, and the lower stamping die is connected with the middle die in an inserted mode. The matching degree between the upper mold and the middle mold is good, raw materials are not prone to leakage, stress in the product demolding process is small, and the frequency of knife edge cracks of products is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent ferrite product production, and in particular relates to a permanent ferrite wet-pressed magnetic tile mould. Background Art

[0002] Materials that can respond to magnetic fields in some way are called magnetic materials. According to the strength of the magnetism exhibited by the material in the external magnetic field, it can be divided into diamagnetic materials, paramagnetic materials, ferromagnetic materials, antiferromagnetic materials and ferrimagnetic materials. Most materials are diamagnetic or paramagnetic, and they react weakly to the external magnetic field. Ferromagnetic materials and ferrimagnetic materials are strong magnetic materials, and the magnetic materials usually referred to are strong magnetic materials.

[0003] Motor magnets are a type of permanent magnets that are mainly used in permanent magnet motors. Magnets are mainly used in permanent magnet DC motors. Unlike electromagnetic motors that generate magnetic potential sources through excitation coils, permanent magnet motors use permanent magnetic materials to generate constant magnetic potential sources. Permanent magnets have many advantages in replacing electric excitation, such as simple motor structure, easy maintenance, light weight, small size, reliable use, less copper, low copper consumption, and low energy consumption.

[0004] At present, most permanent magnet ferrite tiles are arc-shaped with high bow height and large curvature. The tiles are prone to knife-edge cracks during mold forming and pressing, which places high demands on mold processing accuracy and press debugging, making it difficult to meet the requirements for large-scale stable production of ferrite products.

[0005] As the requirements for ferrite products become higher and higher, the problem of knife-edge cracks that are prone to occur during mold forming and pressing of magnetic tiles also needs to be solved. Customers cannot accept products with cracks, and products with cracks are prone to cracking during the assembly and use of magnetic tiles.

[0006] The existing magnetic tile mold basically adopts the design of direct intersection of the outer arc and the chord width surface. After the product is pressed and formed, stress will be generated during the demolding process, so it is easy to produce knife cracks at the intersection, resulting in low product qualification rate and high production cost. Therefore, this application proposes a permanent ferrite wet-pressed magnetic tile mold. Summary of the invention

[0007] The purpose of the present invention is to provide a permanent ferrite wet pressed magnetic tile mold to solve the problems raised by the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a permanent ferrite wet pressed magnetic tile mold, comprising a middle mold, an upper mold, and a lower punch;

[0009] The middle mold is provided with a middle mold outer arc, a middle mold outer arc bevel, and a middle mold plane, the middle mold is provided with a cavity, and the cavity is provided with a material injection port;

[0010] The upper mold is provided with an upper mold outer arc, an upper mold outer arc bevel, and an upper mold plane, an arc-shaped top surface is provided in the upper mold, and a water extraction groove is provided in the upper mold;

[0011] The lower punch is provided with a lower punch cambered surface and a lower punch sealing groove.

[0012] Preferably, the outer arc of the middle mold and the beveled edge of the outer arc of the middle mold are smoothly connected through a transition fillet of the middle mold.

[0013] Preferably, the chord width surface at the cavity intersects with the outer arc bevel of the middle mold, the angle between the chord width surface of the cavity and the outer arc bevel of the middle mold is 60°-75°, the outer arc bevel of the middle mold is 5-10mm long, and the height of the chord width surface at the cavity exceeding the transition radius of the middle mold is 1-2mm.

[0014] Preferably, the outer arc of the upper mold and the beveled edge of the outer arc of the upper mold are smoothly connected through a transition fillet of the upper mold.

[0015] Preferably, the water extraction trough is arranged around the arc-shaped top surface.

[0016] Preferably, a rubber sealing ring is installed in the sealing groove of the lower punch die.

[0017] Preferably, the size of the transition fillet of the middle mold is R3-R6.

[0018] Preferably, the upper mold is provided with an upper mold outer arc and an upper mold outer arc bevel. The upper mold outer arc is parallel and offset by 0.6-1.2mm compared to the middle mold outer arc. The upper mold outer arc bevel is parallel and offset by 0.6-1.2mm compared to the middle mold outer arc bevel. The upper mold transition radius is parallel and offset by 0.6-1.2mm compared to the middle mold transition radius.

[0019] Preferably, when the upper die and the middle die are matched, there is a gap between the upper die and the middle die, the distance of the gap is 0.6-1.2 mm, and the distance of the gap matches the thickness of the filter paper and filter cloth.

[0020] Preferably, after the middle die, upper die and lower punch are assembled, the arc surface of the lower punch, the inner wall of the cavity and the arc-shaped top surface form a shaping cavity, the injection port is connected to the shaping cavity, and the water extraction trough is connected to the shaping cavity.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The mold in the present invention includes a middle mold, an upper mold, and a lower punch. The middle mold, the upper mold, and the lower punch are connected in a modular manner. Before the green billet is produced, the middle mold, the upper mold, and the lower punch need to be assembled together. During the assembly process, the upper mold needs to be aligned with the middle mold outer arc, the upper mold outer arc bevel, the upper mold transition fillet, and the upper mold plane in sequence through the upper mold outer arc, the upper mold outer arc bevel, the upper mold transition fillet, and the middle mold plane. The lower punch is plugged into the middle mold, the upper mold and the middle mold have a good fit, the raw material is not easy to leak, the stress during the product demoulding process is small, and the frequency of knife-edge cracks in the product is reduced.

[0023] 2. After the upper die and the middle die of the present invention are assembled, the four lower punches are respectively inserted into the four cavities in the middle die. At this time, the arc surface of the lower punch, the inner wall of the cavity, and the arc-shaped top surface form a shaping cavity. The injection port is connected with the shaping cavity, and the raw material enters the shaping cavity from the injection port. The excess raw material is discharged through the water trough. The raw material in the shaping cavity is solidified in the shaping cavity to finally obtain a green billet. Four cavities are arranged in the middle die in the mold. A single mold assembly can produce up to four green billets. The connection between the middle die, the upper die, and the lower punch is stable, and the connection position has a good fit, which can effectively improve the difficulty of press debugging, improve the authenticity rate, and reduce costs.

[0024] 3. The lower punch in the present invention is provided with a lower punch sealing groove, and a rubber sealing ring is installed in the lower punch sealing groove. Cowhide used to replace the rubber sealing ring can be installed in the lower punch sealing groove. The cowhide and the rubber sealing ring have the same effect, both of which are to prevent the leakage of the molding and pressing slurry. The lower punch sealing groove is located at the lower side of the shaping cavity, which is located at the lower side of the injection port. Most of the raw materials entering from the injection port enter the shaping cavity, and part of the raw materials flow to the position of the lower punch sealing groove. The rubber sealing ring is installed in the lower punch sealing groove to block the channel from the injection port to the lower side to avoid a large amount of raw materials from being discharged; the arc-shaped top surface is surrounded by a water pumping groove, and the raw materials enter the shaping cavity to fill the entire shaping cavity. The excess raw materials enter the interior of the water pumping groove and are discharged through it. In this way, the excess raw materials injected into the shaping cavity can be extracted to ensure that the amount of raw materials in the shaping cavity is kept within the specified value, and the formed magnetic tile green body will not be concave or collapsed. The formed green body has a complete shape and a relatively neat appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the permanent ferrite wet pressed magnetic tile mold in the present invention.

[0026] Figure 2 It is a structural schematic diagram of the middle mold in the present invention.

[0027] Figure 3 It is a structural schematic diagram of the upper mold in the present invention.

[0028] Figure 4It is a schematic structural diagram of the lower punch die in the present invention.

[0029] In the figure: 1. middle die; 11. outer arc of middle die; 12. bevel of outer arc of middle die; 13. transition fillet of middle die; 14. plane of middle die; 15. cavity; 16. injection port; 2. upper die; 21. outer arc of upper die; 22. bevel of outer arc of upper die; 23. transition fillet of upper die; 24. plane of upper die; 25. drainage groove; 26. arc-shaped top surface; 3. lower punch; 31. arc surface of lower punch; 32. sealing groove of lower punch. DETAILED DESCRIPTION

[0030] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 4 A permanent magnet ferrite wet pressed magnetic tile mold includes a middle mold 1, an upper mold 2, and a lower punch 3; the middle mold 1, the upper mold 2, and the lower punch 3 are combined and connected. Before the green billet is produced, the middle mold 1, the upper mold 2, and the lower punch 3 need to be assembled together.

[0032] Motor magnets are a type of permanent magnets that are mainly used in permanent magnet motors. Magnets are mainly used in permanent magnet DC motors. Unlike electromagnetic motors that generate magnetic potential sources through excitation coils, permanent magnet motors use permanent magnetic materials to generate constant magnetic potential sources. Permanent magnets have many advantages in replacing electric excitation, such as simple motor structure, easy maintenance, light weight, small size, reliable use, less copper, low copper consumption, and low energy consumption.

[0033] The magnetic tile is formed by pressing a mold. After the middle mold 1, the upper mold 2, and the lower punch 3 in the mold are assembled together, the raw materials are fed into them to produce the product.

[0034] Permanent magnet ferrite magnetic tiles are all arc-shaped with high bow height and large curvature. The tiles are prone to knife-edge cracks during mold forming and pressing, which places high requirements on mold processing accuracy and press debugging, and is difficult to meet the needs of large-scale stable production of ferrite products. In order to meet the needs of large-scale production of magnetic tiles, this application proposes a permanent magnet ferrite wet-pressed magnetic tile mold.

[0035] Reference Figure 2 The middle mold 1 is provided with a middle mold outer arc 11, a middle mold outer arc bevel 12, and a middle mold plane 14. The middle mold outer arc 11 and the middle mold outer arc bevel 12 are smoothly connected through a middle mold transition fillet 13. The middle mold 1 is provided with a cavity 15. The chord width surface of the cavity 15 intersects with the middle mold outer arc bevel 12. The cavity 15 is provided with a material injection port 16;

[0036] Reference Figure 3 The upper mold 2 is provided with an upper mold outer arc 21, an upper mold outer arc bevel 22, and an upper mold plane 24. The upper mold outer arc 21 and the upper mold outer arc bevel 22 are smoothly connected through an upper mold transition fillet 23. A water extraction groove 25 is provided in the upper mold 2 for draining the green body. An arc-shaped top surface 26 is provided in the upper mold 2. The water extraction groove 25 is arranged around the arc-shaped top surface 26.

[0037] Reference Figure 4 The lower punch 3 is provided with a lower punch arc surface 31 and a lower punch sealing groove 32. A rubber sealing ring is installed in the lower punch sealing groove 32. Cowhide for replacing the rubber sealing ring can be installed in the lower punch sealing groove 32. The cowhide and the rubber sealing ring have the same effect, both of which are to prevent the leakage of the molding pressing slurry. The lower punch 3 is plugged into the cavity 15, and the lower punch 3 and the cavity 15 can slide freely up and down, thus completing the assembly and separation work between the middle mold 1 and the lower punch 3.

[0038] The outer arc 11 of the middle mold intersects with the outer arc bevel 12 of the middle mold, and the two are naturally transitioned through the transition fillet 13 of the middle mold. The size of the transition fillet 13 of the middle mold is R3-R6 (that is, the diameter is 3-6mm); the middle mold 1 is provided with a middle mold plane 14 and a cavity 15, and an injection port 16 is provided in the cavity 15. The chord width surface of the cavity 15 intersects with the outer arc bevel 12 of the middle mold, and the angle between the chord width surface of the cavity 15 and the outer arc bevel 12 of the middle mold is 60°-75°. The outer arc bevel 12 of the middle mold is 5-10mm long, and the height of the chord width surface at the cavity 15 exceeding the transition fillet 13 of the middle mold is 1-2mm.

[0039] The upper mold 2 is provided with an upper mold outer arc 21 and an upper mold outer arc bevel 22. The upper mold outer arc 21 is parallel and offset by 0.6-1.2 mm compared with the middle mold outer arc 11. The upper mold outer arc bevel 22 is parallel and offset by 0.6-1.2 mm compared with the middle mold outer arc bevel 12.

[0040] The upper die outer arc 21 intersects with the upper die outer arc bevel 22, and the two are naturally transitioned through the upper die transition fillet 23. The upper die transition fillet 23 is parallel and offset by 0.6-1.2 mm compared to the middle die transition fillet 13.

[0041] The upper mold 2 is provided with an upper mold plane 24 which intersects with the upper mold outer arc bevel 22. The upper mold 2 is processed with a drainage groove 25 at a position corresponding to the middle mold cavity 15 of the middle mold 1. The drainage groove 25 is used for draining the green body.

[0042] The mold comprises a middle mold 1, an upper mold 2, and a lower punch 3. The middle mold 1, the upper mold 2, and the lower punch 3 are connected in a modular manner. Before the green blank is produced, the middle mold 1, the upper mold 2, and the lower punch 3 need to be assembled together. During the assembly process, the upper mold 2 needs to correspond to the middle mold outer arc 11, the middle mold outer arc bevel 12, the middle mold transition fillet 13, and the middle mold plane 14 in sequence through the upper mold outer arc 21, the upper mold outer arc bevel 22, the upper mold transition fillet 23, and the upper mold plane 24. The upper mold 2 and the middle mold 1 have a good fit, the raw material is not easy to leak, the stress in the product demoulding process is small, and the frequency of knife edge cracks in the product is reduced.

[0043] The lower punch 3 is provided with a lower punch arc surface 31, and a lower punch sealing groove 32 is processed around it. A cowhide or rubber sealing ring is installed at the lower punch sealing groove 32. The cowhide or rubber sealing ring is used to prevent the leakage of the molding and pressing slurry. The lower punch 3 is installed in the cavity 15 in the middle mold 1, and the lower punch 3 and the cavity 15 can slide freely up and down.

[0044] During molding and pressing, the upper mold 2 is matched with the middle mold outer arc 11, the middle mold outer arc bevel 12, the middle mold transition fillet 13, and the middle mold plane 14 through the upper mold outer arc 21, the upper mold outer arc bevel 22, the upper mold transition fillet 23, and the upper mold plane 24. Specifically, the upper mold 2 is in one-to-one correspondence with the middle mold outer arc 11, the middle mold outer arc bevel 12, the middle mold transition fillet 13, and the middle mold plane 14 through the upper mold outer arc 21, the upper mold outer arc bevel 22, the upper mold transition fillet 23, and the upper mold plane 24, and when the upper mold 2 is matched with the middle mold 1, there is a gap between the two, and the distance of the gap is 0.6-1.2mm, which matches the thickness of the filter paper and filter cloth; the filter paper and filter cloth are used to filter the moisture of the slurry so that the green body can be formed, remove excess moisture in the raw material, and allow the raw material to solidify inside the molding cavity, and the raw material is finally solidified into a green body.

[0045] After the middle die 1, the upper die 2, and the lower punch 3 are assembled, the arc surface 31 of the lower punch, the inner wall of the cavity 15, and the arc-shaped top surface 26 form a shaping cavity, the injection port 16 is connected with the shaping cavity, the raw material enters the shaping cavity from the injection port 16, and the excess raw material is discharged through the water extraction trough 25, that is, the water extraction trough 25 is connected with the shaping cavity.

[0046] The lower punch 3 is provided with a lower punch sealing groove 32, and a rubber sealing ring is installed in the lower punch sealing groove 32. The lower punch sealing groove 32 can be installed with cowhide to replace the rubber sealing ring. The cowhide and the rubber sealing ring have the same effect, and both are used to prevent the leakage of the molding and pressing slurry. The lower punch sealing groove 32 is located at the lower side of the shaping cavity, which is located at the lower side of the injection port 16. Most of the raw materials entering from the injection port 16 enter the shaping cavity, and part of the raw materials flow to the position of the lower punch sealing groove 32. The rubber sealing ring is installed in the lower punch sealing groove 32 to block the channel from the injection port 16 to the lower side to prevent a large amount of raw materials from being discharged;

[0047] When the magnetic tile is formed, the lower punch arc surface 31 in the lower punch 3 fits with the structure of the bottom of the magnetic tile green body, and the arc top surface 26 fits with the structure of the top of the magnetic tile green body, and the inner wall of the cavity 15 fits with the structure of the side of the magnetic tile green body, and they cooperate together to form a molding cavity with the same shape as the magnetic tile green body, thereby pressing the magnetic tile green body;

[0048] The arc-shaped top surface 26 is surrounded by a water extraction groove 25. The raw material enters the molding cavity and fills the entire molding cavity. The excess raw material enters the inside of the water extraction groove 25 and is discharged through it. In this way, the excess raw material injected into the molding cavity can be extracted to ensure that the amount of raw material in the molding cavity is maintained within the specified value, and the molded magnetic tile green body will not be dented or collapsed.

[0049] The green body is a product produced by the upper die 2, the middle die 1 and the lower punch die 3 when working, by injecting materials through the injection port 16 and the press forming and pressing.

[0050] Working principle:

[0051] The mold includes a middle mold 1, an upper mold 2, and a lower punch 3. The middle mold 1, the upper mold 2, and the lower punch 3 are connected in a modular manner. Before the green blank is produced, the middle mold 1, the upper mold 2, and the lower punch 3 need to be assembled together. During the assembly process, the upper mold 2 needs to be aligned with the middle mold outer arc 11, the middle mold outer arc bevel 12, the middle mold transition fillet 13, and the middle mold plane 14 through the upper mold outer arc 21, the upper mold outer arc bevel 22, the upper mold transition fillet 23, and the upper mold plane 24. The upper mold 2 and the middle mold 1 have a good fit, the raw material is not easy to leak, the stress in the product demoulding process is small, and the frequency of knife cracks in the product is reduced;

[0052] After the upper mold 2 and the middle mold 1 are assembled, the four lower punches 3 are respectively inserted into the four cavities 15 in the middle mold 1. At this time, the arc surface 31 of the lower punch, the inner wall of the cavity 15, and the arc-shaped top surface 26 form a shaping cavity. The injection port 16 is connected with the shaping cavity. The raw material enters the shaping cavity from the injection port 16, and the excess raw material is discharged through the water trough 25. The raw material in the shaping cavity is solidified in the shaping cavity to finally obtain a green billet. Four cavities 15 are arranged in the middle mold 1 in the mold, and a single mold assembly can produce up to four green billets.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet ferrite wet pressed magnetic tile mold, characterized in that: It comprises a middle die (1), an upper die (2) and a lower punch die (3); The middle mold (1) is provided with a middle mold outer arc (11), a middle mold outer arc bevel (12), and a middle mold plane (14); the middle mold (1) is provided with a mold cavity (15), and the mold cavity (15) is provided with a material injection port (16); The upper mold (2) is provided with an upper mold outer arc (21), an upper mold outer arc bevel (22), and an upper mold plane (24); the upper mold (2) is provided with an arc-shaped top surface (26); and the upper mold (2) is provided with a water extraction groove (25); The lower punch die (3) is provided with a lower punch die cambered surface (31) and a lower punch die sealing groove (32).

2. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: The middle mold outer arc (11) and the middle mold outer arc bevel (12) are smoothly connected via the middle mold transition fillet (13).

3. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: The chord width surface at the mold cavity (15) intersects with the outer arc bevel (12) of the middle mold, the angle between the chord width surface of the mold cavity (15) and the outer arc bevel (12) of the middle mold is 60°-75°, the outer arc bevel (12) of the middle mold is 5-10 mm long, and the height of the chord width surface at the mold cavity (15) exceeding the transition fillet (13) of the middle mold is 1-2 mm.

4. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: The upper die outer arc (21) and the upper die outer arc bevel (22) are smoothly connected via an upper die transition fillet (23).

5. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: The water extraction groove (25) is arranged around the arc-shaped top surface (26).

6. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: A rubber sealing ring is installed in the lower punch die sealing groove (32).

7. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 2, characterized in that: The size of the middle mold transition fillet (13) is R3-R6.

8. A permanent ferrite wet pressed magnetic tile mold according to claim 4, characterized in that: The upper mold (2) is provided with an upper mold outer arc (21) and an upper mold outer arc bevel (22); the upper mold outer arc (21) is parallel and offset by 0.6-1.2 mm compared to the middle mold outer arc (11); the upper mold outer arc bevel (22) is parallel and offset by 0.6-1.2 mm compared to the middle mold outer arc bevel (12); and the upper mold transition fillet (23) is parallel and offset by 0.6-1.2 mm compared to the middle mold transition fillet (13).

9. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: When the upper die (2) and the middle die (1) are matched, there is a gap between the upper die (2) and the middle die (1), the distance of the gap is 0.6-1.2 mm, and the distance of the gap matches the thickness of the filter paper and filter cloth.

10. A permanent magnet ferrite wet pressed magnetic tile mold according to claim 1, characterized in that: After the middle die (1), the upper die (2) and the lower punch die (3) are assembled, the arc surface (31) of the lower punch die, the inner wall of the cavity (15) and the arc-shaped top surface (26) form a shaping cavity, the injection port (16) is connected to the shaping cavity, and the water extraction trough (25) is connected to the shaping cavity.

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