Neodymium-iron-boron magnetic material processing cold-press forming apparatus and method of use

Abstract

This invention discloses a cold pressing molding equipment and method for processing neodymium iron boron magnetic materials. The equipment includes a pressure chamber, a mold shell fixed inside the pressure chamber, and a first power component and a second power component disposed inside the pressure chamber. By setting the inner mold shell, the lower pressure head is first moved into the mold shell, positioning the inner mold shell and the lower pressure head. A first distance sensor monitors the movement of the inner mold shell, and a second distance sensor monitors the movement of the lower pressure head. When the inner mold shell reaches the designated position, the system controls the electronically controlled valve to discharge the material. After discharge, the upper pressure head is controlled to press the material. After pressing, the system controls the upper pressure head and the inner mold shell to move back to their original positions, and the lower pressure head moves downward to remove the molded product. This method not only prevents magnetic material powder from escaping from gaps during discharge or pressing, but also facilitates the removal of the molded product after pressing, reducing the forced contact area between the product and the mold cavity wall during demolding.

Description

Technical Field

[0001] This invention relates to the field of cold pressing technology for magnetic materials, specifically to a cold pressing equipment and method for processing neodymium iron boron magnetic materials. Background Technology

[0002] Neodymium iron boron (NdFeB), simply put, is a type of magnet. Unlike the magnets we usually see, NdFeB magnetic materials possess extremely high energy product and coercivity, far exceeding the magnetic properties of traditional AlNiCo, ferrite, and Samarium Cobalt permanent magnets. Furthermore, NdFeB magnetic materials also boast advantages such as high energy density, high energy product, and high coercivity, leading to their widespread application in modern industry and electronics.

[0003] Currently, there are various magnetic material molding devices on the market, such as die-casting machines, injection molding machines, and extruders. During the molding process, the raw material needs to be loaded into the molding cavity, then extruded by the extrusion head, and finally removed from the extrusion die.

[0004] In actual production, after molding is completed, the existing method of removing the molded product is to push the pressure head upward to eject the molded product from the mold. However, during the upward movement of the molded product, the side of the product will rub against the inner wall of the mold, which can easily cause wear and defects on the side of the product.

[0005] The existing method involves making the lower pressure head movable for demolding. This method, where both the upper and lower pressure heads are movable, avoids excessive force from the lower pressure head pushing the formed blank upwards, which could cause cracks in the blank. However, before pressing, the lower pressure head needs to be moved into the forming cavity, and magnetic material powder needs to be poured into the cavity before pressing. But because the lower pressure head is movable, there is a gap between the lower pressure head and the forming cavity. During material pouring or pressing by the upper pressure head, the powder can escape from the gap, resulting in poor and inconsistent product quality after molding.

[0006] Faced with the above situation, when both the upper and lower pressure heads inside the mold are movable, how to prevent material leakage through gaps during the feeding process and how to ensure the quality of the finished product when demolding become problems that need to be solved. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a cold pressing molding equipment and method for processing neodymium iron boron magnetic materials, which avoids material leakage through gaps during the material feeding process and also ensures the quality of the finished product when demolding.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a cold-pressing molding device for processing neodymium iron boron magnetic materials, comprising a pressure chamber, a mold shell fixed inside the pressure chamber, a first power assembly and a second power assembly disposed inside the pressure chamber, wherein the output end of the first power assembly is fixedly connected to a lower pressure head. The second power assembly includes a second telescopic mechanism fixedly connected to the pressure chamber and a moving plate. The top plate of the pressure chamber is equipped with a first distance sensor for detecting the distance of the moving plate.

[0009] A mold inner shell, which is movably inserted into the mold outer shell, is fixedly connected below the movable plate. The inner shell contains a mold cavity. A third power assembly is located below the movable plate, comprising a third telescopic mechanism connected to the bottom side of the movable plate and an upper pressure head fixedly connected to the output shaft of the third telescopic mechanism. A second distance sensor for detecting the distance to the upper pressure head is embedded in the top plate of the mold inner shell. A material feeding assembly is located inside the pressure chamber, comprising a material storage tank, a material injection pipe communicating with the storage tank, and an electrically controlled valve mounted on the material injection pipe. The end of the material injection pipe communicates with the mold cavity.

[0010] As a preferred embodiment of the present invention, multiple fixed columns are fixedly connected to the bottom side of the movable plate, and the inner shell of the mold is fixedly connected to the bottom end of the fixed columns.

[0011] As a preferred embodiment of the present invention, guide members are provided on both sides of the upper pressure head, a guide groove for the movement of the guide members is provided in the inner cavity of the mold, and a moving port for the movement of the output shaft of the third telescopic mechanism is provided at the top of the inner cavity of the mold.

[0012] As a preferred embodiment of the present invention, a molding cavity is provided inside the outer shell of the mold, and the inner shell of the mold is movably inserted into the molding cavity.

[0013] As a preferred embodiment of the present invention, a sealing ring is provided on the bottom side of the inner shell of the mold to make contact with the pressing head.

[0014] As a preferred technical solution of the present invention, the position where the injection tube communicates with the inner cavity of the mold is higher than the required injection height in the inner cavity of the mold. When the material is injected into the inner cavity of the mold through the injection tube, the average accumulation height of the material will not exceed the opening height at the end of the injection tube. In this way, during the pressing process of the upper pressure head, the opening at the end of the injection tube will not affect the pressing of the upper pressure head.

[0015] As a preferred embodiment of the present invention, the first power assembly includes a first telescopic mechanism fixedly disposed inside the pressurization box, and a support plate is fixedly connected to the output end of the first telescopic mechanism. The support plate is fixedly connected to the lower pressure head.

[0016] This invention provides a method for using a cold pressing forming equipment for processing neodymium iron boron magnetic materials, comprising the following steps:

[0017] S1. Before pressing and molding, start the first power unit and move the lower pressure head into the mold shell.

[0018] S2. The second power component drives the inner shell of the mold to move downward. The real-time distance detected by the first distance sensor is L1. The moving distance of the moving plate detected by the first distance sensor is equivalent to the moving distance of the inner shell of the mold.

[0019] Assuming the distance detected by the second distance sensor is L when the inner shell of the mold is in full contact with the lower pressure head. a .

[0020] S2.1. When L1 < L a The inner shell of the mold continues to move downwards.

[0021] S2.2. When L1 >= L a The second power unit stops working, and the system controls the feeding unit to start working.

[0022] S3. The electric control valve opens, pouring a fixed amount of magnetic material powder into the inner shell of the mold. After one injection of magnetic material powder is completed, the electric control valve closes.

[0023] S4. The system controls the third power mechanism to start working, and the second distance sensor detects the real-time distance between the inner shell of the mold and the upper pressure head as L2.

[0024] Assume the distance detected by the second distance sensor is L when the upper pressure head completes the downward pressing action. b .

[0025] S4.1. When L2 < L b The upper pressure head continues to move downwards.

[0026] S4.2. When L2 >= L b The system controls the third power component to stop working.

[0027] S4. The upper and lower pressure heads press the magnetic material. After a specified time, the system controls the third power component to drive the upper pressure head to move upward.

[0028] Assume that when the upper pressure head moves to the highest point of its stroke range, the distance value detected by the first distance sensor is L. c .

[0029] When L2 > L c The third power component continuously drives the upper pressure head to move upward.

[0030] When L2 <= L c The system controls the third power component to stop working, and the system controls the second power component to work.

[0031] S5. The second power component drives the inner shell of the mold to move upward to the highest point of the inner shell's stroke range.

[0032] S6. The system controls the first power component to start working, and the first telescopic mechanism drives the lower pressure head to move downward, so that the molded product can be taken out from the surface of the lower pressure head.

[0033] This invention provides a cold pressing forming equipment and method for processing neodymium iron boron magnetic materials, which has the following beneficial effects:

[0034] This invention, by setting an inner mold shell, requires the lower pressure head to be moved into the outer mold shell before pressing. The inner mold shell and the lower pressure head are positioned and engaged. Then, material is injected into the inner mold cavity. A first distance sensor monitors the movement of the inner mold shell, and a second distance sensor monitors the movement of the lower pressure head. When the inner mold shell reaches the designated position, the system automatically controls the electronically controlled valve to discharge the material. After discharge, the upper pressure head is controlled to press the material. After pressing, the system controls the upper pressure head and the inner mold shell to move back to their original positions, and the lower pressure head moves downward to facilitate the removal of the molded product. This method not only prevents magnetic material powder from escaping from gaps during discharge or pressing, but also facilitates the removal of the molded product after pressing. It significantly reduces the forced contact area between the product and the mold cavity wall during demolding, with only a small contact distance during the upward movement of the inner mold shell during demolding. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0036] Figure 2 This is a schematic diagram of the cross-sectional structure of the mold inner shell and the lower pressure head abutting together according to the present invention.

[0037] Figure 3 This is a schematic diagram of the structure during the pressing process of the inner shell of the mold according to the present invention.

[0038] Figure 4 This is a schematic diagram of the structure during the downward pressing process of the upper pressure head of the present invention.

[0039] In the diagram: 1. Pressure box; 2. First power assembly, 201. Lower pressure head, 202. First telescopic mechanism, 203. Support plate; 3. Mold shell, 301. Molding cavity; 4. Second power assembly, 401. Second telescopic mechanism, 402. Moving plate, 403. Fixed column; 5. Mold inner shell, 501. Mold inner cavity, 502. Guide groove, 503. Moving port; 6. Material feeding assembly, 601. Material storage box, 602. Electrically controlled valve, 603. Injection pipe; 7. Third power assembly, 701. Third telescopic mechanism, 702. Upper pressure head, 703. Guide component; 8. First distance sensor; 9. Second distance sensor; 10. Sealing ring. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0041] Example 1: This invention designs a cold pressing forming equipment for processing neodymium iron boron magnetic materials, mainly including the following:

[0042] exist Figure 1 and Figure 2 The equipment on display includes a pressure box 1, inside which a mold shell 3 is fixed, and also a first power assembly 2 and a second power assembly 4.

[0043] The first telescopic mechanism 202 in the first power assembly 2 is located inside the pressure box 1. The output end of the first telescopic mechanism 202 is fixedly connected to the support plate 203, and the support plate 203 is fixedly connected to the lower pressure head 201.

[0044] The second telescopic mechanism 401 in the second power assembly 4 is fixed inside the pressure chamber 1, and its output end is connected to the moving plate 402. A first distance sensor 8 is configured on the top plate of the pressure chamber 1, which is used to detect the distance of the moving plate 402. The inner mold shell 5 is fixedly connected to the lower part of the moving plate 402, and the inner mold shell 5 is movably inserted into the outer mold shell 3. The outer mold shell 3 has a forming cavity 301 inside, and the inner mold shell 5 moves within this forming cavity 301. The inner mold shell 5 has an inner mold cavity 501 inside, and multiple fixing posts 403 are fixedly connected to the bottom side of the moving plate 402. The inner mold shell 5 is connected to the bottom side of these fixing posts 403. In addition, a sealing ring 10 is provided on the bottom side of the inner mold shell 5, and the sealing ring 10 is in pressure contact with the lower pressure head 201.

[0045] from Figure 2 Below the movable plate 402, a third power assembly 7 is positioned. The third power assembly 7 includes a third telescopic mechanism 701, which is fixedly connected to the movable plate 402, and its output shaft is fixedly connected to the upper pressure head 702. Guide members 703 are provided on both sides of the upper pressure head 702, and guide grooves 502 for the guide members 703 to move are formed within the mold cavity 501. A moving opening 503 for the output shaft of the third telescopic mechanism 701 is also formed at the top of the mold cavity 501. Furthermore, a second distance sensor 9 is embedded in the top plate of the mold inner shell 5; this sensor is used to detect the distance to the upper pressure head 702.

[0046] Combination Figure 3 and Figure 4The pressure chamber 1 is equipped with a feeding assembly 6, which includes a storage bin 601 fixed inside the pressure chamber 1. One side of the storage bin 601 is connected to an injection pipe 603, and an electrically controlled valve 602 is mounted on the surface of the injection pipe 603. The end of the injection pipe 603 is connected to the inner cavity 501 of the mold, and the position where the injection pipe 603 connects to the inner cavity 501 is higher than the required injection height within the inner cavity 501. When material is injected into the inner cavity 501 through the injection pipe 603, the average accumulation height of the material will not exceed the opening height at the end of the injection pipe 603. This ensures that during the downward pressing of the upper pressure head 702, the opening at the end of the injection pipe 603 will not affect the downward pressing action of the upper pressure head 702.

[0047] Example 2: The working principle of a cold pressing forming equipment for processing neodymium iron boron magnetic materials in this invention is as follows:

[0048] First, before pressing and molding, the first power component 2 is activated, and the lower pressure head 201 moves into the mold shell 3.

[0049] Then, the second power assembly 4 drives the inner mold shell 5 to move downwards. The real-time distance detected by the first distance sensor 8 is L1. The moving distance of the moving plate 402 detected by the first distance sensor 8 is equivalent to the moving distance of the inner mold shell 5. And let's assume that the distance detected by the second distance sensor 9 when the inner mold shell 5 is in complete contact with the lower pressure head 201 is L1. a .

[0050] Scenario 1: When L1 is less than L a At that time, the inner shell 5 of the mold continues to move downward.

[0051] Scenario 2, when L1 is greater than or equal to L a At this time, the second power component 4 stops working, the inner shell of the mold 5 stops moving downward, and the system controls the unloading component 6 to start working.

[0052] Immediately afterwards, the solenoid valve 602 opens, injecting a fixed amount of magnetic material powder from the storage tank 601 into the mold cavity 501. After one injection of magnetic material powder is completed, the solenoid valve 602 closes.

[0053] The system controls the third power mechanism 7 to start working. The second distance sensor 9 detects the real-time distance between the inner mold shell 5 and the upper pressure head 702 as L2, and assumes that the distance detected by the second distance sensor 9 when the upper pressure head 702 completes the downward pressing action is L. b .

[0054] Scenario 1: When L2 is less than L b The upper pressure head 702 continues to move downwards.

[0055] Scenario 2, when L2 is greater than or equal to Lb The system controls the third power component 7 to stop working, and the upper pressure head 702 stops moving downward.

[0056] The upper pressure head 702 and the lower pressure head 201 press the magnetic material. After a specified time, the system controls the third power component 7 to move the upper pressure head 702 upward. When the upper pressure head 702 moves to the highest point of its travel range, the distance value detected by the first distance sensor 8 is L. c .

[0057] Scenario 1: When L2 is greater than L c The third power component 7 continuously drives the upper pressure head 702 to move upward.

[0058] Scenario 2, when L2 is less than or equal to L c At this time, the system controls the third power component 7 to stop working, the upper pressure head 702 stops moving upward, and the system controls the second power component 4 to work, the second power component 4 drives the inner mold shell 5 to move upward to the highest point of the travel range of the inner mold shell 5.

[0059] The system controls the first power component 2 to start working, and the first telescopic mechanism 202 drives the lower pressure head 201 to move downward, so that the molded product can be taken out from the surface of the lower pressure head 201.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold pressing forming device for processing neodymium iron boron magnetic materials, comprising a pressure chamber (1), a mold shell (3) fixed inside the pressure chamber (1), a first power assembly (2) and a second power assembly (4) disposed inside the pressure chamber (1), wherein, The output end of the first power component (2) is fixedly connected to a pressure head (201), characterized in that: The first power assembly (2) includes a first telescopic mechanism (202) fixedly installed inside the pressure box (1). The output end of the first telescopic mechanism (202) is fixedly connected to a support plate (203), and the support plate (203) is fixedly connected to the lower pressure head (201). The second power assembly (4) includes a second telescopic mechanism (401) and a movable plate (402) that are fixedly connected to the pressurization box (1); The top plate of the pressurization chamber (1) is equipped with a first distance sensor (8) for detecting the distance of the moving plate (402). The moving plate (402) is fixedly connected to the lower part of the mold inner shell (5) which is movably inserted into the mold outer shell (3), and the mold inner shell (5) is provided with a mold inner cavity (501). A third power assembly (7) is disposed below the movable plate (402). The third power assembly (7) includes a third telescopic mechanism (701) connected to the bottom side of the movable plate (402) and an upper pressure head (702) fixedly connected to the output shaft of the third telescopic mechanism (701). The top plate of the inner shell (5) of the mold is equipped with a second distance sensor (9) for detecting the distance of the upper pressure head (702); The pressure box (1) is equipped with a feeding assembly (6), which includes a storage box (601), a feeding pipe (603) connected to the storage box (601), and an electric control valve (602) configured on the feeding pipe (603). The end of the feeding pipe (603) is connected to the inner cavity of the mold (501), and the position where the feeding pipe (603) is connected to the inner cavity of the mold (501) is higher than the required injection height in the inner cavity of the mold (501).

2. The cold pressing forming equipment for processing neodymium iron boron magnetic materials according to claim 1, characterized in that: Multiple fixed columns (403) are fixedly connected to the bottom side of the movable plate (402), and the inner shell of the mold (5) is fixedly connected to the bottom end of the fixed columns (403).

3. The cold pressing forming equipment for processing neodymium iron boron magnetic materials according to claim 1, characterized in that: The upper pressure head (702) is provided with guide members (703) on both sides, the mold cavity (501) is provided with guide groove (502) for the movement of guide member (703), and the top of the mold cavity (501) is provided with moving port (503) for the movement of output shaft of third telescopic mechanism (701).

4. The cold pressing forming equipment for processing neodymium iron boron magnetic materials according to claim 1, characterized in that: The mold outer shell (3) has a molding cavity (301) inside, and the mold inner shell (5) is movably inserted into the molding cavity (301).

5. The cold pressing equipment for processing neodymium iron boron magnetic materials according to claim 1, characterized in that: The bottom side of the inner shell (5) of the mold is provided with a sealing ring (10) that is in contact with the pressing head (201).

6. A method of using a cold pressing forming equipment for processing neodymium iron boron magnetic materials, characterized in that, The cold pressing equipment for processing neodymium iron boron magnetic materials according to any one of claims 1 to 5 includes the following steps: S1. Before pressing and molding, start the first power assembly (2) and move the lower pressure head (201) into the mold shell (3); S2. The second power component (4) drives the inner shell of the mold (5) to move downward, and the real-time distance detected by the first distance sensor (8) is L1; Let the distance value detected by the second distance sensor (9) when the inner shell of the mold (5) is in complete contact with the lower pressure head (201) be L. a ; S2.

1. When L1 < L a The inner shell of the mold (5) continues to move downward; S2.

2. When L1 >= L a The second power component (4) stops working, and the system controls the unloading component (6) to start working; S3. The electric control valve (602) is opened, and a certain amount of magnetic material powder is poured into the inner shell (5) of the mold. After the injection of magnetic material powder is completed, the electric control valve (602) is closed. S4. The system controls the third power component (7) to start working, and the second distance sensor (9) detects the real-time distance between the inner shell of the mold (5) and the upper pressure head (702) as L2; Suppose that the distance value detected by the second distance sensor (9) when the upper pressure head (702) completes the pressing action is L. b ; S4.

1. When L2 < L b The upper pressure head (702) continues to move downward; S4.

2. When L2 >= L b The system controls the third power component (7) to stop working; S4. The upper pressure head (702) and the lower pressure head (201) press the magnetic material. After a specified time, the system controls the third power component (7) to drive the upper pressure head (702) to move upward. Suppose that when the upper pressure head (702) moves to the highest point of its stroke range, the distance value detected by the first distance sensor (8) is L. c ; When L2 > L c The third power component (7) continuously drives the upper pressure head (702) to move upward; When L2 <= L c The system controls the third power component (7) to stop working, and the system controls the second power component (4) to work; S5. The second power component (4) drives the inner shell of the mold (5) to move upward to the highest point of the stroke range of the inner shell of the mold (5); S6. The system controls the first power component (2) to start working, and the first telescopic mechanism (202) drives the lower pressure head (201) to move downward, so that the molded product can be taken out from the surface of the lower pressure head (201).

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