A permanent ferrite magnetic tile mold capable of preventing explosion

Abstract

The invention discloses a permanent magnet ferrite tile mold capable of preventing cracking, relates to the technical field of permanent magnet ferrite tile molds, and solves the technical problem that the existing permanent magnet ferrite tile molds often cause cracking when the tile products are heated up or cooled down during sintering, resulting in low production quality of the tile products. The invention comprises a mold body, which comprises a concave mold, several convex molds inserted under the concave mold, and a water absorption plate arranged above the concave mold. Several cavities are formed between each convex mold and the concave mold and the water absorption plate, and a filter cloth is arranged between the water absorption plate and the concave mold. Several small water absorption holes and a pair of large water absorption holes are arranged on the water absorption plate corresponding to each cavity position, and the several small water absorption holes are gradually divergently arranged from the center to the surroundings. The design of the invention can make the green body density tend to be consistent, can effectively solve the problem of product cracking of the tile products during kiln sintering, and significantly improve the production quality of the tile products.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnet ferrite tile molds, and in particular relates to a permanent magnet ferrite tile mold capable of preventing explosion. Background Art

[0002] Permanent ferrite is a kind of metal oxide with ferromagnetism. It is an important component of magnetic materials. It is mainly made of SrO (strontium oxide) or BaO (barium oxide) and Fe2O3 (ferric oxide) as raw materials and manufactured by ceramic process. Features and performance: Hard and brittle: Compared with other permanent magnets, ferrite magnets are hard and brittle. Low magnetic energy: But its magnetic energy is relatively low. Not easy to demagnetize and corrode: Ferrite magnets have strong anti-demagnetization and corrosion resistance, which is mainly due to its main raw material is oxide, so it is not affected by the environment or chemicals (except strong acid). Simple production process and low price: Its production process is relatively simple, and because the raw material price is cheap, the price of the finished product is relatively low compared with other magnets. The production process of permanent ferrite mainly includes the following steps: Batching: SrO or BaO and Fe2O3 and other raw materials are batched in a certain proportion. Pre-burning: The batched mixture is pre-burned. Crushing: The pre-burned material is crushed. Ball milling: ball mill the crushed material to obtain finer powder. Powder making: further process the ball milled powder to obtain magnetic powder that meets the requirements. Molding: dry pressing magnetic field molding, dry pressing molding or wet pressing magnetic field molding are used to make magnetic powder into magnets. Sintering: sinter the molded magnet to improve its magnetic properties. Machining: mechanically process the sintered magnet to meet the requirements of its size and shape. Permanent ferrite has a wide range of applications in many fields due to its unique performance and price advantages: namely, the electronics industry: used to manufacture various electronic devices and components. Information industry: used to manufacture computers, communication equipment, etc. Motorcycle and power tool industry: used to manufacture engines, motors and other components. Automobile industry: used to manufacture sensors, actuators and other components. Other fields: also widely used in handicrafts, adsorbents, toys, motors, speakers and other fields.

[0003] The permanent ferrite magnetic tile forming mainly consists of a hydraulic press, a mold, and a wire package. Since the wire package is around the vertical mold, the magnetic lines of force form a closed magnetic field through the press and the mold during the pressing process. In the permanent ferrite mold forming process, at the moment when the hydraulic press is closed, the slurry is injected from the injection hole into the mold cavity (the cavity is a closed cavity formed between the water absorption plate, the middle mold, and the punch, wherein there is a filter cloth between the concave mold and the water absorption plate, and the punch has a sealing ring) for magnetization. When the product is pressed, it is magnetized and pressed at the same time. During the forming pressing process, the magnetic field of the wire package magnetizes and orients the slurry in the mold. While the slurry in the cavity is pressed, the water of the slurry is sucked into the negative pressure barrel from the water absorption plate through the filter cloth and the water absorption hole through the vacuum. When the set pressure is reached, the forming pressing is completed and the green blank is taken out from the mold. After the pressing is completed, the water absorption plate leaves the concave mold, and a closed space cannot be formed under the water absorption plate, and water backflow will occur.

[0004] At present, the green body is air-dried and then sintered in a kiln. After sintering, it is ground and the excess is removed by a grinding wheel before it is ground into a finished product.

[0005] However, since the magnetic tile product is arc-shaped, the density of the magnetic tile product gradually decreases from the middle to the two sides. Due to the difference in density, the magnetic tile product often cracks when it is heated up or cooled down during sintering. After the cracking occurs, it can only be adjusted by adjusting the temperature rise curve and air door of the kiln, but the cracking still occurs. Therefore, based on the above problems, a permanent ferrite magnetic tile mold that can prevent cracking is proposed. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a permanent magnet ferrite tile mold that can prevent cracking, which solves the technical problem that the existing permanent magnet ferrite tile mold often cracks when the tile product is sintered due to temperature increase and temperature decrease, resulting in low production quality of the tile product.

[0007] To achieve the above object, according to an embodiment of the first aspect of the present invention, a permanent magnet ferrite magnetic tile mold capable of preventing explosion is provided, comprising a mold body, wherein the mold body comprises a concave mold, a plurality of convex molds inserted under the concave mold, and a water absorption plate arranged above the concave mold;

[0008] A plurality of cavities are formed between each of the male and female dies and the water absorbing plate, and a filter cloth is arranged between the water absorbing plate and the female die;

[0009] The water absorption plate is provided with a plurality of small water absorption holes and a pair of large water absorption holes corresponding to each cavity position, the plurality of small water absorption holes are gradually arranged from the center to the surroundings, and the pair of large water absorption holes are located at the outermost sides of the small water absorption holes;

[0010] The water absorption plate is provided with a square water absorption groove corresponding to each cavity position, and each pair of large water absorption holes is connected with each square water absorption groove. By designing the water absorption plate in the mold body as an arc surface at the position corresponding to each cavity, the water absorption plate is provided with several small water absorption holes and a pair of large water absorption holes at the position corresponding to each cavity, and the several small water absorption holes are gradually arranged from the center to the surroundings, and the number of small water absorption holes gradually decreases from the center to the surroundings, because the moisture in the center of the green body is discharged last during the drying process, and small water absorption holes are added in the middle of the green body to discharge part of the moisture first, and there are square water absorption grooves around the small water absorption holes corresponding to each cavity, and the density of the magnetic tile product in the middle gradually decreases from the two sides of the arc to the two sides, so large water absorption holes are designed on both sides of the arc; the top surface of each convex mold in the mold body is designed as an arc surface, and each convex mold and the concave mold are plugged into each other below, and a sealing ring is used for sealing when plugging in. The present invention produces magnetic tile products based on the above technology, which can make the density of the green body tend to be consistent, can effectively solve the product explosion of magnetic tile products during kiln sintering, and significantly improve the production quality of magnetic tile products.

[0011] A further improvement is that the female mold is provided with a plurality of slots which are plugged into each male mold.

[0012] A further improvement is that a sealing ring is sleeved on each of the male molds, and the sealing ring contacts the inner wall of each slot.

[0013] A further improvement is that a plurality of residual water grooves are designed above the water absorption plate, each residual water groove corresponds to each cavity and is located in the square water absorption groove.

[0014] A further improvement is that the water absorption plate is designed as a curved surface at the position corresponding to each cavity.

[0015] A further improvement is that each pair of the large water absorption holes corresponds to two sides of the arc surface of each cavity.

[0016] A further improvement is that the filter cloth is arched upward at a position corresponding to each cavity.

[0017] A further improvement is that after the mold body is assembled, each square water absorption groove is located on the bottom surface of the water absorption plate, and the bottom surface of each pair of large water absorption holes is perpendicular to the square water absorption groove.

[0018] A further improvement is that the number of the small water absorption holes gradually decreases from the center to the periphery.

[0019] A further improvement is that the top surface of each of the male molds is designed as a curved surface.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention designs the green body, that is, designs the compression ratio to make the density of the green body tend to be consistent, specifically: the outer arc R4 of the green body is matched with the outer arc R3 of the concave mold, and the inner arc R1 of the green body is matched with the arc R2 of the punch mold. The compression ratios of the six points of the green body (A2 / A1=B2 / B1) can be made consistent by adjusting the outer arc R4 and the inner arc R3 of the green body. The absorbent plate in the mold body is designed as an arc surface at the position corresponding to each cavity, and the absorbent plate is provided with several small absorbent holes and a pair of large absorbent holes at the position corresponding to each cavity. Several small absorbent holes are gradually arranged from the center to the surroundings, and the number of small absorbent holes gradually decreases from the center to the surroundings. Because the moisture in the center of the green body is discharged last during the drying process, small absorbent holes are added in the middle of the green body to discharge part of the moisture first. There are square absorbent grooves around the small absorbent holes corresponding to each cavity. The density of the magnetic tile product in the middle gradually decreases from both sides of the arc to both sides, so large absorbent holes are designed on both sides of the arc; the top surface of each convex mold in the mold body is designed as an arc surface, and each convex mold and concave mold are plugged into each other at the bottom, and a sealing ring is used for sealing when plugging. The present invention produces magnetic tile products based on the above technology, which can make the density of the green body tend to be consistent, can effectively solve the problem of product cracking during kiln sintering of magnetic tile products, and significantly improves the production quality of magnetic tile products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the magnetic tile mold (after the green blank is placed) of the present invention;

[0023] Figure 2 The present invention Figure 1 The enlarged structural diagram at A in the middle;

[0024] Figure 3 is a schematic bottom-up cross-sectional view of a water-absorbing plate of the present invention;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the concave mold of the present invention when viewed from above;

[0026] Figure 5 It is a schematic diagram of the front view structure of the die section of the present invention.

[0027] Markings in the figure:

[0028] 1. Square water absorption trough; 2. Large water absorption hole; 3. Small water absorption hole; 4. Residual water trough; 5. Water absorption plate; 6. Green body; 7. Filter cloth; 8. Cavity; 9. Sealing ring; 10. Concave die; 11. Punch die; 12. Anti-return water absorption hole; 13. Vertical injection section; 14. Horizontal injection section. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0030] like Figure 1 As shown, a permanent magnet ferrite tile mold capable of preventing explosion comprises:

[0031] The mold body includes a die 10, a plurality of convex molds 11 inserted below the die 10, and a water absorbing plate 5 arranged above the die 10;

[0032] A plurality of cavities 8 are formed between each male mold 11, the female mold 10 and the water absorption plate 5. A filter cloth 7 is arranged between the water absorption plate 5 and the female mold 10. The filter cloth 7 is arched upward at the position corresponding to each cavity 8. The water absorption plate 5 is designed as a curved surface at the position corresponding to each cavity 8. The top surface of each male mold 11 is designed as a curved surface.

[0033] It should be noted that the reference Figure 2 As shown, before the mold body is assembled and used, a suitable green body 6 is pre-selected, and the outer arc R4 of the green body 6 is matched with the outer arc R3 of the concave mold 10, and the inner arc R1 of the green body 6 is matched with the arc R2 of the punch 11. The compression ratios (A2 / A1=B2 / B1) of the six points of the green body can be made consistent by adjusting the outer arc R4 and the inner arc R3 of the green body 6:

[0034] Several small water absorption holes 3 and a pair of large water absorption holes 2 are provided on the water absorption plate 5 corresponding to each cavity 8. Several small water absorption holes 3 are gradually arranged from the center to the surroundings, and the number of small water absorption holes 3 gradually decreases from the center to the surroundings. A pair of large water absorption holes 2 is located at the outermost side of the small water absorption holes 3, and each pair of large water absorption holes 2 corresponds to the two sides of the arc surface of each cavity 8, and the number of large water absorption holes 2 on both sides is appropriately increased or decreased according to the length of the shaft height.

[0035] A square water absorption groove 1 is arranged on the water absorption plate 5 corresponding to each cavity 8, and each pair of large water absorption holes 2 is connected to each square water absorption groove 1. The water absorption plate 5 is designed as an arc surface at the position corresponding to each cavity 8. The water absorption plate 5 is provided with several small water absorption holes 3 and a pair of large water absorption holes 2 at the position corresponding to each cavity 8. Several small water absorption holes 3 are gradually arranged from the center to the surroundings, and the number of small water absorption holes 3 gradually decreases from the center to the surroundings. Because the moisture in the center of the green body 6 is discharged last during the drying process, small water absorption holes 3 are added in the middle of the green body 6 to discharge part of the moisture first. There are square water absorption grooves 1 around the small water absorption holes 3 corresponding to each cavity 8. The density of the magnetic tile product in the middle gradually decreases from both sides of the arc to both sides, so large water absorption holes 2 are designed on both sides of the arc. The production of magnetic tile products based on the above technology can make the density of the green body 6 tend to be consistent, which can effectively solve the problem of product cracking during sintering of the magnetic tile product in the kiln, and significantly improve the production quality of the magnetic tile product.

[0036] Specifically, as a preferred implementation scheme, the die 10 is provided with several slots which are plugged into each punch 11. The top surface of each punch 11 in the mold body is designed as an arc surface. Each punch 11 and the die 10 are plugged into each other below, and a sealing ring 9 is used for sealing during the plugging. A sealing ring 9 is sleeved on each punch 11, and the sealing ring 9 contacts the inner wall of each slot to improve the sealing performance.

[0037] Specifically, as a preferred implementation scheme, several residual water grooves 4 are designed above the water absorption plate 5, each residual water groove 4 corresponds to each cavity 8 and is located in the square water absorption groove 1, the groove depth is 6-20mm, and the depth of the groove is 2-4mm lower than the depth of the large water absorption hole 2. The residual water groove 4 prevents the vacuum from forming a closed space after the pressing is completed, and prevents water from returning from the large water absorption hole 2 on the water absorption plate 5.

[0038] Specifically, as a preferred implementation scheme, after the mold body is assembled as a whole, each square water absorption groove 1 is located on the bottom surface of the water absorption plate 5, and the bottom surface of each pair of large water absorption holes 2 is perpendicular to the square water absorption groove 1.

[0039] like Figures 1 to 5 As shown, in this embodiment, it is also necessary to explain that before the application document is implemented, the concave mold 10 is pre-designed at each corresponding cavity 8 as follows Figure 4 As shown, a material injection pipe is provided at the position corresponding to each cavity 8, and the material injection pipe is divided into a horizontal material injection section 14 and a vertical material injection section 13. A φ4-8 anti-reversal material absorption hole 12 is designed above the corresponding horizontal material injection section 14 on the water absorption plate 5. This design prevents the green body from having uneven density due to reversal. Figure 3In addition, it should be noted that the application document focuses on improving the existing permanent magnet ferrite tile mold itself to prevent the tile products from frequently exploding when heated up or cooled down during sintering, which results in low production quality of the tile products, and does not involve other aspects; the working principle of a permanent magnet ferrite tile mold that can prevent exploding is introduced as follows:

[0040] When the permanent magnet ferrite mold is assembled and molded, at the moment after the hydraulic press is molded, the slurry is injected from the injection hole into the mold cavity 8 of the mold (the mold cavity is a closed cavity formed between the water absorption plate 5, the punch 11, and the die 10, wherein there is a filter cloth 7 between the die 10 and the water absorption plate 5, and the punch 11 has a sealing ring 9) for magnetization. When the product is pressed, the magnetization is performed while pressing. During the molding and pressing, the coil magnetic field magnetizes and orients the slurry of the mold. While the slurry in the mold cavity 8 is pressed, the water of the slurry is sucked into the negative pressure barrel from the top of the water absorption plate 5 through the filter cloth 7, the small water absorption hole 3, and the large water absorption hole 2. When the set pressure is reached, the molding and pressing is completed, and the green blank 6 is taken out from the mold. The above is the existing public technology.

[0041] The present invention is based on the above technology, and designs the green body 6, that is, designs the compression ratio to make the density of the green body 6 tend to be consistent, specifically: the outer arc R4 of the green body 6 is matched with the outer arc R3 of the die 10, and the inner arc R1 of the green body 6 is matched with the arc R2 of the punch 11. The compression ratios (A2 / A1=B2 / B1) of the 6 points of the green body can be made consistent by adjusting the outer arc R4 and the inner arc R3 of the green body 6.

[0042] The design of the water absorption plate 5 in the mold body is as follows: the water absorption plate 5 is designed as an arc surface at the position corresponding to each cavity 8, and the water absorption plate 5 is provided with several small water absorption holes 3 and a pair of large water absorption holes 2 at the position corresponding to each cavity 8, and the several small water absorption holes 3 are gradually divergently arranged from the center to the surroundings, and the number of small water absorption holes 3 gradually decreases from the center to the surroundings, because the moisture in the center of the green body 6 is discharged last during the drying process, and the small water absorption holes 3 are added in the middle of the green body 6 to discharge part of the moisture first, and there are square water absorption grooves 1 around the small water absorption holes 3 corresponding to each cavity 8, and the density in the middle of the magnetic tile product gradually decreases from both sides of the arc to both sides, so large water absorption holes 2 are designed on both sides of the arc;

[0043] The top surface of each convex mold 11 in the mold body is designed as an arc surface, and each convex mold 11 and the concave mold 10 are plugged into each other at the bottom, and the sealing ring 9 is used for sealing during plugging. The present invention produces magnetic tile products based on the above technology, which can make the density of the green body 6 tend to be consistent, can effectively solve the problem of product cracking during sintering in the kiln, and significantly improve the production quality of magnetic tile products.

[0044] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A permanent magnet ferrite tile mold capable of preventing explosion, characterized in that: The mold body comprises a die (10), a plurality of convex dies (11) inserted below the die (10), and a water absorbing plate (5) arranged above the die (10); A plurality of cavities (8) are formed between each of the male mold (11), the female mold (10) and the water absorption plate (5), and a filter cloth (7) is arranged between the water absorption plate (5) and the female mold (10); The water absorption plate (5) is provided with a plurality of small water absorption holes (3) and a pair of large water absorption holes (2) corresponding to each cavity (8), the plurality of small water absorption holes (3) are arranged to gradually diverge from the center to the surroundings, and the pair of large water absorption holes (2) are located at the outermost sides of the small water absorption holes (3); A square water absorption groove (1) is arranged on the water absorption plate (5) corresponding to the position of each cavity (8), and each pair of large water absorption holes (2) is connected to each square water absorption groove (1).

2. A permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: The female mold (10) is provided with a plurality of slots for plugging into each male mold (11).

3. A permanent magnet ferrite tile mold capable of preventing explosion according to claim 2, characterized in that: A sealing ring (9) is sleeved on each of the male molds (11), and the sealing ring (9) is in contact with the inner wall of each slot.

4. A permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: A plurality of residual water grooves (4) are designed above the water absorption plate (5), and each residual water groove (4) corresponds to each cavity (8) and is located inside the square water absorption groove (1).

5. The permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: The water absorption plate (5) is designed as a curved surface at a position corresponding to each cavity (8).

6. A permanent magnet ferrite tile mold capable of preventing explosion according to claim 5, characterized in that: Each pair of the large water absorption holes (2) corresponds to two sides of the arc surface of each cavity (8).

7. The permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: The filter cloth (7) is arched upward at a position corresponding to each cavity (8).

8. The permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: After the mold body is assembled, each square water absorption groove (1) is located on the bottom surface of the water absorption plate (5), and the bottom surface of each pair of large water absorption holes (2) is perpendicular to the square water absorption groove (1).

9. The permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: The number of the small water absorption holes (3) gradually decreases from the center to the periphery.

10. The permanent magnet ferrite tile mold capable of preventing explosion according to claim 1, characterized in that: The top surface of each of the male molds (11) is designed as a curved surface.

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