NdFeB magnetic material processing and cold press molding equipment and use method

Abstract

The invention discloses neodymium-iron-boron magnetic material machining cold press forming equipment and a using method.The neodymium-iron-boron magnetic material machining cold press forming equipment comprises a pressurizing box, a mold outer shell fixed in the pressurizing box, a first power assembly and a second power assembly, and the first power assembly and the second power assembly are arranged in the pressurizing box; a mold inner shell and a lower pressing head are positioned and matched, a first distance sensor is arranged to monitor the moving state of the mold inner shell, a second distance sensor is arranged to monitor the moving state of the lower pressing head, after the mold inner shell reaches a designated position, a system controls an electric control valve to conduct discharging, after discharging, an upper pressing head is controlled to conduct pressing, and after pressing, the mold inner shell and the lower pressing head are matched. And the system controls the upper pressing head and the mold inner shell to move back to original positions, the lower pressing head moves downwards, and the formed product is taken out, so that the magnetic material powder can be prevented from escaping from the gap during blanking or pressing, the formed product is convenient to take after pressing, and the forced contact area between the product and the mold cavity wall during demolding is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cold pressing and forming of magnetic materials, in particular to a cold pressing and forming device for processing neodymium iron boron magnetic materials and a use method thereof. Background Art

[0002] NdFeB, in simple terms, is a kind of magnet. Unlike the magnets we usually see, NdFeB magnetic materials have extremely high magnetic energy product and coercive force. Its magnetic properties are much higher than those of traditional AlNiCo, ferrite and SmCo permanent magnet materials. In addition, NdFeB magnetic materials also have the advantages of high energy density, high magnetic energy product and coercive force, which makes them widely used in modern industry and electronic technology.

[0003] At present, there are many magnetic material molding devices on the market, such as die casting machines, injection molding machines, extruders, etc. In the molding process, the raw materials need to be filled into the molding cavity, then extruded by the extrusion head, and finally taken out from the extrusion die.

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

[0005] The existing solution is to set the lower punch to be movable for demoulding, and to use the movable upper and lower punches for demoulding to avoid the lower punch pushing the molded blank upward with too much force, which causes cracks in the blank. However, before pressing and molding, the lower punch needs to be moved into the molding cavity, and magnetic material powder is poured into the molding cavity before pressing. However, since the lower punch is movable, there is a gap between the lower punch and the molding cavity. During the pouring or pressing process of the upper punch, powder will escape from the gap, which will result in poor product quality and uneven quality of the molded product.

[0006] Faced with the above situation, when the upper and lower pressure heads in the mold are movable, how to avoid the phenomenon of raw 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] In order to solve the above technical problems, the present invention provides a NdFeB magnetic material processing cold pressing molding equipment and a use method, which avoids the gap leakage of raw materials during the feeding process, and also ensures the quality of the finished product when demolding.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cold pressing forming equipment for processing NdFeB magnetic materials, comprising a pressurizing box, a mold shell fixed in the pressurizing box, a first power assembly and a second power assembly arranged inside the pressurizing box, wherein the output end of the first power assembly is fixedly connected with a lower pressure head. The second power assembly comprises a second telescopic mechanism and a moving plate fixedly connected with the pressurizing box. The top plate of the pressurizing box is provided with a first distance sensor for detecting the distance of the moving plate.

[0009] A mold inner shell that is movably inserted into the mold outer shell is fixedly connected below the movable plate, and a mold inner cavity is arranged inside the mold inner shell. A third power assembly is arranged below the movable plate, and the third power assembly includes 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 of the upper pressure head is embedded in the top plate of the mold inner shell. A material discharge assembly is arranged in the pressurized box, and the material discharge assembly includes a material storage box, a material injection pipe connected to the material storage box, and an electric control valve arranged on the material injection pipe, wherein the end of the material injection pipe is connected to the mold inner cavity.

[0010] As a preferred technical solution of the present invention, a plurality of 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 side ends of the fixed columns.

[0011] As a preferred technical solution of the present invention, guide members are arranged on both sides of the upper pressure head, a guide groove for movement of the guide members is opened in the mold cavity, and a moving opening for movement of the output shaft rod of the third telescopic mechanism is opened at the top of the mold cavity.

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

[0013] As a preferred technical solution of the present invention, a sealing ring is provided on the bottom side of the inner shell of the mold for extrusion contact with the lower pressure head.

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

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

[0016] The present invention provides a method for using a cold pressing forming device for processing a NdFeB magnetic material, comprising the following steps:

[0017] S1. Before pressing and molding, the first power assembly is started and the pressing head moves into the mold shell.

[0018] S2. The second power assembly drives the mold inner shell to move downward, and 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 mold inner shell.

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

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

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

[0022] S3. The electric control valve is opened, and a certain amount of magnetic material powder is poured into the inner shell of the mold. After the magnetic material powder is injected once, the electric control valve is closed.

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

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

[0025] S4.1. When L2<L b , the upper pressure head continues to move downward.

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

[0027] S4. The upper pressure head and the lower pressure head press the magnetic material. After a specified period of 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 up to the highest point of its travel range, the distance value detected by the first distance sensor is L c .

[0029] When L2>L c , the third power assembly 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 assembly drives the mold inner shell to move upward to the highest point within the mold inner shell travel range.

[0032] S6. The system controls the first power assembly 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] The present invention provides a NdFeB magnetic material processing cold pressing forming equipment and a use method, which has the following beneficial effects:

[0034] The present invention sets a mold inner shell. When pressing, it is necessary to first move the lower pressure head into the mold outer shell, position and match the mold inner shell with the lower pressure head, and then inject material into the mold cavity. A first distance sensor is configured to monitor the movement state of the mold inner shell, and a second distance sensor is configured to monitor the movement state of the lower pressure head. When the mold inner shell reaches the specified position, the system automatically controls the electric control valve to unload the material. After the unloading is completed, the upper pressure head is controlled to press. After the pressing is completed, the system controls the upper pressure head and the mold inner 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 can not only prevent the magnetic material powder from escaping from the gap during unloading or pressing, but also facilitate the removal of the molded product after the pressing is completed, and greatly reduces the forced contact area between the product and the mold cavity wall during demolding. During demolding, there is only a small contact distance when the mold inner shell moves upward. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0039] In the figure: 1. pressurizing 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. unloading assembly, 601. material storage box, 602. electric control valve, 603. injection pipe; 7. third power assembly, 701. third telescopic mechanism, 702. upper pressure head, 703. guide piece; 8. first distance sensor; 9. second distance sensor; 10. sealing ring. DETAILED DESCRIPTION

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

[0041] Embodiment 1: The present invention designs a cold pressing forming equipment for processing NdFeB magnetic materials, which mainly includes the following contents:

[0042] exist Figure 1 and Figure 2 The device shown includes a pressurized box 1, inside which a mold shell 3 is fixed, and a first power assembly 2 and a second power assembly 4 are also provided.

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

[0044] The second telescopic mechanism 401 in the second power assembly 4 is fixed inside the pressurizing box 1, and its output end is connected to the moving plate 402. A first distance sensor 8 is arranged on the top plate of the pressurizing box 1, and this sensor is used to detect the distance of the moving plate 402. The lower part of the moving plate 402 is fixedly connected to the mold inner shell 5, and the mold inner shell 5 can be movably inserted into the mold outer shell 3. A molding cavity 301 is provided inside the mold outer shell 3, and the mold inner shell 5 moves in this molding cavity 301. There is a mold inner cavity 501 inside the mold inner shell 5, and a plurality of fixed columns 403 are fixedly connected to the bottom side of the moving plate 402, and the mold inner shell 5 is connected to the bottom side ends of these fixed columns 403. In addition, a sealing ring 10 is provided on the bottom side surface of the mold inner shell 5, and the sealing ring 10 is in extrusion contact with the lower pressure head 201.

[0045] from Figure 2 As can be seen, a third power assembly 7 is arranged below the movable plate 402. The third power assembly 7 includes a third telescopic mechanism 701, and the third telescopic mechanism 701 is fixedly connected to the movable plate 402, and its output shaft is fixedly connected to the upper press head 702. Guide members 703 are arranged on both sides of the upper press head 702, and a guide groove 502 for the guide member 703 to move is provided in the mold cavity 501. A moving opening 503 for the output shaft of the third telescopic mechanism 701 to move is also provided at the top of the mold cavity 501. In addition, a second distance sensor 9 is embedded in the top plate of the mold inner shell 5, and this sensor is used to detect the distance of the upper press head 702.

[0046] Combination Figure 3 and Figure 4The pressurizing box 1 is provided with a material discharge assembly 6: the material discharge assembly 6 comprises a material storage box 601, and the material storage box 601 is fixed inside the pressurizing box 1. One side of the material storage box 601 is connected to an injection pipe 603, and an electric control valve 602 is provided on the surface of the injection pipe 603. The end of the injection pipe 603 is connected to the mold cavity 501, and the position where the injection pipe 603 is connected to the mold cavity 501 is higher than the height of the material required to be injected into the mold cavity 501. When the material is injected into the mold cavity 501 through the injection pipe 603, the average stacking height of the material will not exceed the opening height of the end of the injection pipe 603, so that it can be ensured that during the downward pressing process 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] Embodiment 2: In the present invention, a method for using a cold pressing forming device for processing NdFeB magnetic materials has the following specific working principle:

[0048] Firstly, before the pressing and forming, the first power assembly 2 is started, and the lower pressing head 201 moves into the mold shell 3 .

[0049] Then, the second power assembly 4 drives the mold inner shell 5 to move downward, and 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 mold inner shell 5. When the mold inner shell 5 is in full contact with the lower pressure head 201, the distance value detected by the second distance sensor 9 is L a .

[0050] Case 1: When L1 is less than L a When the mold inner shell 5 continues to move downward.

[0051] Case 2: When L1 is greater than or equal to L a When the second power assembly 4 stops working, the mold inner shell 5 stops moving downward, and the system controls the blanking assembly 6 to start working.

[0052] Next, the electric control valve 602 is opened to inject a certain amount of magnetic material powder from the storage box 601 into the mold cavity 501. After the injection of the magnetic material powder is completed, the electric control valve 602 is closed.

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

[0054] Case 1: When L2 is less than L b , the upper pressure head 702 continues to move downward.

[0055] Case 2: When L2 is greater than or equal to Lb , the system controls the third power assembly 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 assembly 7 to drive the upper pressure head 702 to move 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] Case 1: When L2 is greater than L c , the third power assembly 7 continues to drive the upper pressure head 702 to move upward.

[0058] Case 2: When L2 is less than or equal to L c When the system controls the third power assembly 7 to stop working, the upper pressure head 702 stops moving upward, and the system controls the second power assembly 4 to work, and the second power assembly 4 drives the mold inner shell 5 to move upward to the highest point position within the travel range of the mold inner shell 5.

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

[0060] 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 cold pressing molding device for processing NdFeB magnetic materials, comprising a pressurizing box (1), a mold shell (3) fixed in the pressurizing box (1), a first power assembly (2) and a second power assembly (4) arranged inside the pressurizing box (1), wherein: The output end of the first power assembly (2) is fixedly connected to a pressure head (201), which is characterized in that: The second power assembly (4) comprises a second telescopic mechanism (401) fixedly connected to the pressurized box (1) and a movable plate (402); The top plate of the pressurizing box (1) is provided with a first distance sensor (8) for detecting the distance of the moving plate (402); A mold inner shell (5) that is movably inserted into the mold outer shell (3) is fixedly connected below the movable plate (402), and a mold inner cavity (501) is provided inside the mold inner shell (5); A third power assembly (7) is disposed below the movable plate (402), and the third power assembly (7) comprises 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 mold inner shell (5) is embedded with a second distance sensor (9) for detecting the distance of the upper pressure head (702); A material discharge assembly (6) is arranged in the pressurized box (1), and the material discharge assembly (6) comprises a material storage box (601), an injection pipe (603) connected to the material storage box (601), and an electric control valve (602) arranged on the injection pipe (603), wherein the end of the injection pipe (603) is connected to the mold cavity (501).

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

3. The cold pressing forming equipment for processing NdFeB magnetic materials according to claim 1, characterized in that: Guide members (703) are arranged on both sides of the upper pressing head (702), a guide groove (502) for the guide member (703) to move is provided in the mold cavity (501), and a moving opening (503) for the output shaft of the third telescopic mechanism (701) to move is provided at the top of the mold cavity (501).

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

5. The cold pressing forming equipment for processing NdFeB magnetic materials according to claim 1, characterized in that: The bottom side surface of the mold inner shell (5) is provided with a sealing ring (10) which is in compression contact with the lower pressure head (201).

6. The NdFeB magnetic material processing cold pressing forming equipment according to claim 1, characterized in that: The position where the injection pipe (603) is connected to the mold inner cavity (501) is higher than the height of the material required to be injected into the mold inner cavity (501).

7. The NdFeB magnetic material processing cold pressing forming equipment according to claim 1, characterized in that: The first power assembly (2) comprises a first telescopic mechanism (202) fixedly arranged inside the pressurizing box (1); an 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).

8. A method for using a cold pressing molding device for processing NdFeB magnetic materials, characterized in that: A cold pressing forming device for processing NdFeB magnetic materials according to any one of claims 1 to 7 comprises the following steps: S1. Before pressing and molding, the first power assembly (2) is started, and the lower pressing head (201) is moved into the mold housing (3); S2. The second power assembly (4) drives the mold inner shell (5) to move downward, and the real-time distance detected by the first distance sensor (8) is L1; Assume that the distance value detected by the second distance sensor (9) when the mold inner shell (5) is in full contact with the lower pressure head (201) is L a ; S2.

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

2. When L1>=L a , the second power assembly (4) stops working, and the system controls the unloading assembly (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 magnetic material powder is injected once, the electric control valve (602) is closed; S4. The system controls the third power mechanism (7) to start working, and the second distance sensor (9) detects that the real-time distance between the mold inner shell (5) and the upper pressure head (702) is L2; Assume that the distance value detected by the second distance sensor (9) when the upper pressure head (702) completes the downward pressure 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 assembly (7) to stop working; S4. The upper pressure head (702) and the lower pressure head (201) press the magnetic material. After a specified period of time, the system controls the third power assembly (7) to drive the upper pressure head (702) to move upward; Assume that when the upper pressure head (702) moves upward to the highest point of its travel range, the distance value detected by the first distance sensor (8) is L c ; When L2>L c , the third power assembly (7) continuously drives the upper pressure head (702) to move upward; When L2<=L c , the system controls the third power assembly (7) to stop working, and the system controls the second power assembly (4) to work; S5. The second power assembly (4) drives the mold inner shell (5) to move upward to the highest point of the mold inner shell (5) within the travel range; S6. The system controls the first power assembly (2) to start working, and the first telescopic mechanism (202) drives the lower pressing head (201) to move downward, so that the molded product can be taken out from the surface of the lower pressing head (201).

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