Tile-shaped magnet forming die, magnet forming method and motor magnet

Abstract

The present invention relates to a tile-shaped magnet forming die, a magnet forming method, and an electric machine magnet, and includes a base. A fixing frame is provided on the base, a fixing block is provided on the fixing frame, a plurality of forming cavities are formed in the fixing block, a lower die assembly is provided on the fixing frame and below the fixing block, an upper die assembly is provided above the fixing frame and on the fixing block, and a feeding head is provided on the fixing block and on one side of the forming cavity. According to the present invention, the movement of the blanking frame can be reversely controlled according to the actual required amount in the forming cavity, so as to stop the feeding, avoid the unstable feeding amount caused by pressure fluctuations controlled by time, and the thickness stability of the blanks made in the front and back cycles is good.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of tile-shaped magnets, in particular to a tile-shaped magnet forming die, a magnet forming method, and a motor magnet. Background Art

[0002] Magnetic tiles are a type of permanent magnet, mainly used as tile-shaped magnets in permanent magnet motors. According to different raw materials, magnetic tiles are mainly divided into three categories: ferrite magnetic tiles, neodymium iron boron magnetic tiles, and aluminum nickel cobalt magnets. Magnetic tiles are mainly used in permanent magnet DC motors. Permanent magnet motors use permanent magnet materials to generate a constant magnetic potential source, and have the advantages of simple structure, convenient maintenance, light weight, and small volume. According to different usage requirements, some magnetic tiles require a high magnetic flux density on the inner arc surface. Therefore, a special die for manufacturing magnetic tiles with a high magnetic flux density on the inner arc surface is needed.

[0003] In the existing tile-shaped magnet forming die, the injection molding is realized by the injection time. This forming method cannot solve the root problem of pressure instability, so there will be a problem that the thickness of the blanks before and after forming is different. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present invention provides a tile-shaped magnet forming die, a magnet forming method, and a motor magnet. The specific technical solutions are as follows:

[0005] A tile-shaped magnet forming die includes a base, a fixing frame is arranged on the base, a fixing block is arranged on the fixing frame, a plurality of forming cavities are opened in the fixing block, a lower die assembly is arranged on the fixing frame and below the fixing block, an upper die assembly is arranged above the fixing frame and on the fixing block, a filling head is arranged on the fixing block and on one side of the forming cavity, a plurality of fixing frames are arranged inside the filling head and at positions corresponding to the forming cavities, second through holes communicating with the cavity of the filling head are opened on both sides of the fixing frame, a blanking frame is slidably connected inside the fixing frame, first through holes adapted to the second through holes are opened on both sides of the blanking frame, blanking ports communicating with the external environment are opened on both sides of the bottom of the blanking frame, two electric push rods are arranged in the direction opposite to the blanking of the tile-shaped magnet on the filling head, a filling pipe is arranged on the filling head and between the two electric push rods, a driving assembly is arranged on the blanking frame, and the driving assembly pushes the blanking frame to move to control the alignment of the first through hole and the second through hole so that the slurry inside the filling head enters the blanking frame and then flows into the forming cavity through the blanking port.

[0006] As an improvement of the above technical solution, the lower die assembly includes a moving block arranged on the fixing frame, a second cylinder is arranged between the bottom of the moving block and the base, a plurality of connecting rods are arranged on the top of the moving block and at positions corresponding to the forming cavities, and the top of the connecting rods extends into the forming cavity and is fixedly connected to a lower die.

[0007] As an improvement of the above technical solution, the upper die assembly includes an upper die disposed on a fixed frame, and a first cylinder is disposed between the upper die and the fixed frame. The first cylinder pushes the upper die to move and cooperate with the lower die assembly to press and form the slurry inside the forming cavity.

[0008] As an improvement of the above technical solution, the driving assembly includes a fixed rod disposed above the blanking frame. One end of the fixed rod extending outside the fixed frame is fixedly installed with a connecting plate, and a spring is disposed on the surface of the fixed rod between the connecting plate and the injection head.

[0009] As an improvement of the above technical solution, a sealing rail is disposed on the surface of the fixed frame and on one side of the forming cavity.

[0010] The method for forming a tile-shaped magnet includes the following steps:

[0011] S1. Input the slurry into the injection head through a slurry pipe. Use the electric push rod to push the injection head to directly above the forming cavity. The driving assembly drives the blanking frame to move downward, so that the first through hole and the second through hole are aligned. The slurry inside the injection head enters the blanking frame, and finally flows into the forming cavity through the blanking port. Then the driving assembly drives the blanking frame to move upward, so that the first through hole and the second through hole are misaligned, and the second through hole is sealed to prevent continuous blanking.

[0012] S2. Use the electric push rod to pull the injection head back to the initial position, and start the first cylinder, so that the first cylinder drives the upper die to move downward to press and form the slurry.

[0013] S3. After pressing is completed, start the second cylinder. The second cylinder drives the lower die to move upward to remove the formed tile-shaped magnet from the forming cavity. Then the injection head moves to push the tile-shaped magnet off the fixed block.

[0014] For the motor magnet, a tile-shaped magnet is obtained by using the above-mentioned method for forming a tile-shaped magnet, and the motor magnet is obtained after sintering, heat treatment, machining, and surface coating of the tile-shaped magnet.

[0015] The beneficial effects of the present invention:

[0016] The injection head is pushed directly above the molding cavity by an electric push rod. At this time, the driving assembly will drive the blanking frame downward to align the first through hole and the second through hole. The slurry inside the injection head enters the blanking frame and finally flows into the molding cavity through the blanking port. As the slurry in the molding cavity increases, the slurry will push the blanking frame upward to misalign the first through hole and the second through hole, seal the second through hole, and prevent continuous blanking, thus completing automatic quantitative feeding, achieving rapid on-off, reducing filling errors. The actual amount required inside the molding cavity can be used to reversely control the movement of the blanking frame to stop the injection, avoiding the instability of the injection amount caused by pressure fluctuations when using time control. The thickness stability of the blanks made in the front and back cycles is good. Description of the Drawings

[0017] Figure 1 Front view of the overall structure of the present invention;

[0018] Figure 2 Schematic structural diagram of the injection of the present invention;

[0019] Figure 3 For the present invention Figure 2 Enlarged structural diagram at A in;

[0020] Figure 4 Schematic structural diagram of the injection stop of the present invention;

[0021] Figure 5 For the present invention Figure 4 Enlarged structural diagram at B in;

[0022] Figure 6 Top view of the fixing block of the present invention.

[0023] Reference numerals: 1, base; 11, fixing frame; 2, upper mold; 21, first cylinder; 3, moving block; 31, connecting rod; 32, lower mold; 33, second cylinder; 4, fixing block; 41, molding cavity; 5, injection head; 51, spring; 52, connecting plate; 53, blanking frame; 531, blanking port; 532, first through hole; 54, fixing frame; 541, second through hole; 55, fixing rod; 56, electric push rod; 57, injection pipe; 6, sealing rail. Detailed Description of the Invention

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] As the slurry moves upward inside

[0026] Tile-shaped magnet forming die, including a base 1, a fixing frame 11 is arranged on the base 1, a fixing block 4 is arranged on the fixing frame 11, multiple forming cavities 41 are opened in the fixing block 4, a lower die assembly is arranged on the fixing frame 11 and below the fixing block 4, an upper die assembly is arranged on the fixing frame 11 and above the fixing block 4, a feeding head 5 is arranged on the fixing block 4 and on one side of the forming cavity, multiple fixing frames 54 are arranged inside the feeding head 5 and at positions corresponding to the forming cavities 41, second through holes 541 communicating with the cavity of the feeding head 5 are opened on both sides of the fixing frame 54, a blanking frame 53 is slidably connected inside the fixing frame 54, first through holes 532 adapted to the second through holes 541 are opened on both sides of the blanking frame 53, blanking ports 531 communicating with the external environment are opened on both sides of the bottom of the blanking frame 53, two electric push rods 56 are arranged in the direction opposite to the blanking of the tile-shaped magnet on the feeding head 5, a feeding pipe 57 is arranged on the feeding head 5 and between the two electric push rods 56, a driving assembly is arranged on the blanking frame 53, and the driving assembly pushes the blanking frame 53 to move to control the alignment of the first through hole 532 and the second through hole 541 so that the slurry inside the feeding head 5 enters the blanking frame 53, and then flows into the forming cavity 41 through the blanking port 531.

[0027] Input the slurry into the feeding head 5 through a slurry pipe, use the electric push rod 56 to push the feeding head 5 to directly above the forming cavity 41. At this time, the driving assembly will drive the blanking frame 53 to move downward so that the first through hole 532 and the second through hole 541 are aligned. The slurry inside the feeding head 5 enters the blanking frame 53 and finally flows into the forming cavity 41 through the blanking port 531. As the slurry inside the forming cavity increases, the slurry will push the blanking frame upward, causing the first through hole 532 and the second through hole 541 to be misaligned, sealing the second through hole 541 to prevent continuous feeding, thus completing automatic quantitative feeding, achieving rapid on-off, reducing filling errors. For the actual amount required inside the forming cavity, the movement of the blanking frame can be controlled in reverse to stop the feeding, avoiding unstable feeding amount caused by pressure fluctuations when controlled by time. The thickness stability of the blanks made in the front and back cycles is good. Use the electric push rod 56 to pull the feeding head 5 back to the initial position, start the first cylinder 21, so that the first cylinder 21 drives the upper die 2 to move downward to press the slurry into shape. After pressing, start the second cylinder 33, and the second cylinder 33 drives the lower die 32 to move upward to remove the formed tile-shaped magnet from the forming cavity 41. Then the feeding head 5 moves to push the tile-shaped magnet off the fixing block 4 and moves back to directly above the forming cavity 41 to continue feeding. During the movement of the feeding head 5, the blanking of the tile-shaped magnet and the feeding of the forming cavity 41 can be completed. Both the upper die 2 and the lower die 32 are made of magnetically conductive materials, and during the pressing process, the magnetically conductive materials are energized to form an orientation magnetic field.

[0028] In one embodiment, refer toFigure 1 The lower mold assembly includes a moving block 3 disposed on the fixing frame 11. A second cylinder 33 is provided between the bottom of the moving block 3 and the base 1. Multiple connecting rods 31 are arranged at the top of the moving block 3 and at positions corresponding to the molding cavity 41. The top of the connecting rod 31 extends into the molding cavity 41 and is fixedly connected to a lower mold 32. The second cylinder 33 can drive the lower mold 32 to move upward through the connecting rod 31, ejecting the tile-shaped magnet inside the molding cavity 41 from the molding cavity 41. In cooperation with the pushing of the injection head 5 on the tile-shaped magnet, automatic blanking of the tile-shaped magnet can be completed.

[0029] In one embodiment, refer to Figure 1 The upper mold assembly includes an upper mold 2 disposed on the fixing frame 11. A first cylinder 21 is provided between the upper mold 2 and the fixing frame 11. The first cylinder 21 pushes the upper mold 2 to move and cooperate with the lower mold assembly to press and mold the slurry inside the molding cavity 41. The first cylinder 21 drives the upper mold 2 to move downward, and the slurry inside the molding cavity 41 can be pressed and molded.

[0030] In order to enable the blanking frame 53 to move up and down under the feedback action of the slurry inside the molding cavity 41, refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The driving assembly includes a fixing rod 55 disposed above the blanking frame 53. One end of the fixing rod 55 extending outside the fixing frame 54 is fixedly installed with a connecting plate 52. A spring 51 is arranged on the surface of the fixing rod 55 between the connecting plate 52 and the injection head 5. When there is no slurry inside the molding cavity 41 and the blanking frame 53 is aligned with the molding cavity 41, under the action of the spring 51, the blanking frame 53 moves downward, aligning the first through hole 532 and the second through hole 541, so that the slurry inside the injection head 5 enters the blanking frame 53 and then flows into the molding cavity 41 through the blanking port 531. When the molding cavity 41 is filled with slurry, under the reaction force of the slurry, there is an upward acting force on the blanking frame 53, causing the blanking frame 53 to drive the fixing rod 55 to move upward and stretch the spring 51.

[0031] In order to prevent the excess slurry in the blanking frame 53 from flowing out during the movement of the injection head 5, refer to Figure 6 A sealing rail 6 is provided on the surface of the fixing frame 54 and on one side of the molding cavity 41. The sealing rail 6 can push the blanking frame 53 upward, causing the first through hole 532 and the second through hole 541 to be misaligned. At the same time, the sealing rail 6 can block the blanking port 531 at the bottom of the blanking frame 53 to prevent excess slurry from flowing out and polluting the working environment.

[0032] The present invention provides a method for forming a tile-shaped magnet, including the following steps:

[0033] S1. Input the slurry into the injection head 5 through the slurry pipe. Use the electric push rod 56 to push the injection head 5 directly above the molding cavity 41. The driving assembly drives the blanking frame 53 to move downward, aligning the first through hole 532 with the second through hole 541. The slurry inside the injection head 5 enters the blanking frame 53 and finally flows into the molding cavity 41 through the blanking port 531. Then, the driving assembly drives the blanking frame 53 to move upward, misaligning the first through hole 532 and the second through hole 541 and sealing the second through hole 541 to prevent continuous feeding.

[0034] S2. Use the electric push rod 56 to pull the injection head 5 back to the initial position. Start the first cylinder 21, causing the first cylinder 21 to drive the upper mold 2 to move downward to press and form the slurry.

[0035] S3. After pressing, start the second cylinder 33. The second cylinder 33 drives the lower mold 32 to move upward to remove the formed tile-shaped magnet from the molding cavity 41. Then, the injection head moves to push the tile-shaped magnet off the fixing block 4.

[0036] The present invention provides a motor magnet. The tile-shaped magnet is obtained by using the above-mentioned tile-shaped magnet forming method. After sintering, heat treatment, machining, and surface coating of the tile-shaped magnet, the motor magnet is obtained.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Tile-shaped magnet forming die, Characterized in that: It includes a base (1), a fixing frame (11) is arranged on the base (1), a fixing block (4) is arranged on the fixing frame (11), multiple forming cavities (41) are opened in the fixing block (4), a lower die assembly is arranged on the fixing frame (11) and below the fixing block (4), an upper die assembly is arranged above the fixing frame (11) and on the fixing block (4), a feeding head (5) is arranged on the fixing block (4) and on one side of the forming cavity, multiple fixing frames (54) are arranged inside the feeding head (5) at positions corresponding to the forming cavities (41), second through holes (541) communicating with the cavity of the feeding head (5) are opened on both sides of the fixing frame (54), a blanking frame (53) is slidably connected inside the fixing frame (54), first through holes (532) adapted to the second through holes (541) are opened on both sides of the blanking frame (53), blanking ports (531) communicating with the external environment are opened on both sides of the bottom of the blanking frame (53), two electric push rods (56) are arranged in the direction opposite to the blanking of the tile-shaped magnet on the feeding head (5), a feeding pipe (57) is arranged on the feeding head (5) and between the two electric push rods (56), a driving assembly is arranged on the blanking frame (53), and the driving assembly pushes the blanking frame (53) to move to control the alignment of the first through hole (532) and the second through hole (541) so that the slurry inside the feeding head (5) enters the blanking frame (53), and then flows into the forming cavity (41) through the blanking port (531). As the slurry inside the forming cavity (41) increases, the slurry will push the blanking frame (53) to move upward, causing the first through hole (532) and the second through hole (541) to be misaligned; the driving assembly includes a fixing rod (55) arranged above the blanking frame (53), a connecting plate (52) is fixedly installed at one end of the fixing rod (55) extending outside the fixing frame (54), and a spring (51) is arranged on the surface of the fixing rod (55) between the connecting plate (52) and the feeding head (5); a sealing rail (6) is arranged on the surface of the fixing frame (54) and on one side of the forming cavity (41).

2. The tile-shaped magnet forming die according to claim 1, Characterized in that: The lower die assembly includes a moving block (3) arranged on the fixing frame (11), a second cylinder (33) is arranged between the bottom of the moving block (3) and the base (1), multiple connecting rods (31) are arranged on the top of the moving block (3) at positions corresponding to the forming cavities (41), and the top of the connecting rods (31) extends into the forming cavity (41) and is fixedly connected with a lower die (32).

3. The tile-shaped magnet forming die according to claim 1, Characterized in that: The upper mold assembly includes an upper mold (2) disposed on a fixed frame (11). A first cylinder (21) is provided between the upper mold (2) and the fixed frame (11). The first cylinder (21) pushes the upper mold (2) to move and cooperate with the lower mold assembly to press and form the slurry inside the forming cavity (41).

4. Method for forming a tile-shaped magnet Characterized in that: Using the tile-shaped magnet forming mold according to any one of claims 1-3, comprising the following steps: S1. Input the slurry into the injection head (5) through a slurry pipe. Use the electric push rod (56) to push the injection head (5) to directly above the forming cavity (41). The driving assembly drives the blanking frame (53) to move downward, so that the first through hole (532) and the second through hole (541) are aligned. The slurry inside the injection head (5) enters the blanking frame (53), and finally flows into the forming cavity (41) through the blanking port (531). As the slurry inside the forming cavity (41) increases, the slurry will push the blanking frame (53) upward, causing the first through hole (532) and the second through hole (541) to be misaligned, sealing the second through hole (541) to prevent continuous blanking; S2. Use the electric push rod (56) to pull the injection head (5) back to the initial position. Start the first cylinder (21) so that the first cylinder (21) drives the upper mold (2) to move downward to press and form the slurry; S3. After pressing is completed, start the second cylinder (33). The second cylinder (33) drives the lower mold (32) to move upward to remove the formed tile-shaped magnet from the forming cavity (41), and then the injection head moves to push the tile-shaped magnet off the fixed block (4).

5. Motor magnet Characterized in that The tile-shaped magnet is obtained by using the tile-shaped magnet forming method according to claim 4, and the motor magnet is obtained after sintering, heat treatment, machining, and surface coating of the tile-shaped magnet.

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