Sintered neodymium-iron-boron forming die

Abstract

The utility model relates to neodymium iron boron magnet forming technical field discloses a sintered neodymium iron boron forming die, including base, the base top is equipped with bottom plate, is equipped with die holder on the bottom plate, and a plurality of forming grooves are reserved in the die holder, and the middle part of bottom plate is equipped with the material conveying groove that communicates with the die holder, and the bottom end communication of material conveying groove has the material conveying pipe, and the bottom surface of die holder is equipped with the groove hole system that communicates with forming groove for material forming, and the groove hole system makes material even forming in forming groove. Compared with prior art, the advantages are that: through the groove hole system that the delivery hole of rice -shaped groove, shunt groove and edge even distribution constitutes, realizes the even shunt and multi -point synchronous feeding of material from the center to each forming groove, adopts the circular hole channel that horizontal vertical interlaced and constitutes the circulating heating groove, and the even auxiliary heating unit that the liquid inlet pipe and the liquid outlet pipe form, can realize all -round even heating heat preservation to groove hole system and material in forming groove.

Description

Technical Field

[0001] This utility model relates to the field of neodymium iron boron magnet forming technology, specifically to a sintered neodymium iron boron forming mold. Background Technology

[0002] In the automated production process of sintered NdFeB magnets, the molding die is a core component that determines the product's shape accuracy, density uniformity, and production efficiency. The rationality of its material distribution and the stability of its temperature control directly affect the magnetic properties and finished product yield of the sintered NdFeB magnets. Existing sintered NdFeB molding dies typically suffer from problems such as uneven material forming, material flowability easily affected by temperature, and low material conveying efficiency.

[0003] Traditional sintered NdFeB molding dies often employ a structure where a single feeding channel is directly connected to the molding tank. This can lead to localized material accumulation or incomplete filling within the molding tank, resulting in significant density variations and poor magnetic property consistency in the finished product. While some dies incorporate heating structures, the heating areas are dispersed, and temperature conduction is uneven. Material within the slot system is prone to reduced fluidity due to localized cooling, leading to molding defects. Furthermore, traditional dies lack convenient structures for replacing and cleaning the heating medium. Adjusting the heating temperature or maintaining the equipment requires disassembling the dies to address the heating channels, which is not only cumbersome but also prolongs equipment downtime and disrupts production continuity. Additionally, some dies have poorly designed material conveying channels, resulting in high material transport resistance and a tendency to clog, making it difficult to meet the high-precision, high-efficiency, and stable molding requirements of large-scale sintered NdFeB production. Utility Model Content

[0004] The technical problem this invention aims to solve is that existing sintered NdFeB molding dies suffer from uneven material forming, material flowability greatly affected by temperature, low material conveying efficiency, and inconvenient maintenance of heating media, resulting in low finished product qualification rate, poor production efficiency, and cumbersome equipment maintenance. The invention aims to achieve uniform material forming, stable temperature control, efficient material conveying, and convenient maintenance during the sintered NdFeB production process, thereby improving the finished product qualification rate, increasing production efficiency, and simplifying the maintenance process.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A sintered NdFeB molding die includes a base, a bottom plate on the top of the base, a mold base on the bottom plate, a plurality of molding grooves reserved in the mold base, a material conveying groove in the middle of the bottom plate communicating with the mold base, a material conveying pipe connected to the bottom end of the material conveying groove, and a slot system on the bottom surface of the mold base communicating with the molding groove for material molding, the slot system enabling the material to be uniformly molded in the molding groove.

[0007] The base plate is equipped with a uniform auxiliary heating unit, which is used to heat and keep the material in the slot system on the bottom surface of the mold base, so as to maintain the fluidity of the material.

[0008] As an improvement, the slot system includes a ribbed groove on the bottom surface of the mold base. The bottom surface of the mold base is also provided with several diversion grooves that communicate with the ribbed grooves. The diversion grooves are matched with the shape of each forming groove. Several conveying holes are provided between the diversion grooves and the corresponding forming grooves. The ribbed grooves can evenly divert the material conveyed by the material conveying groove to each diversion groove. The diversion grooves are designed to adapt to the shape of the forming groove to ensure that the material conveying path matches the forming groove. With the dispersed feeding of the conveying holes, local accumulation of material in the forming groove can be avoided, ensuring uniform filling of material.

[0009] As an improvement, the uniform auxiliary heating unit includes an inlet pipe and an outlet pipe disposed on the bottom surface of the base plate. A circulating heating tank connected to both the inlet pipe and the outlet pipe is provided in the middle of the base plate. The heating medium enters the circulating heating tank from the inlet pipe and can uniformly heat the base plate when circulating in the tank, thereby transferring the heat to the slot system of the mold base to achieve continuous heat preservation of the material and prevent the material from losing fluidity due to temperature drop. At the same time, the outlet pipe can discharge the cooled heating medium in time to maintain the temperature stability in the circulating heating tank.

[0010] As an improvement, several conveying holes are evenly distributed along the edge of the forming groove to ensure that the material is evenly and uniformly spread in the forming groove at a constant speed. The evenly distributed edge design of the conveying holes allows the material to be fed synchronously from multiple positions in the forming groove, avoiding the difference in material accumulation speed caused by single feeding, further improving the uniformity of material filling, and ensuring that the density of the sintered NdFeB product after forming is consistent.

[0011] As an improvement, the circulating heating tank is composed of several interconnected circular channels arranged horizontally and vertically. The interlaced circular channels can expand the coverage of the heating medium, making the heating of each area of ​​the bottom plate uniform, avoiding local low temperature in the tank system due to heating dead zones. At the same time, the circular channels have low flow resistance, which can improve the circulation efficiency of the heating medium and shorten the temperature adjustment response time.

[0012] As an improvement, the base plate is provided with drain holes around its perimeter that communicate with the circulating heating tank. The drain holes are threaded. When it is necessary to replace the heating medium or clean the circulating heating tank, the threads can be unscrewed to drain the residual heating medium or impurities in the tank through the drain holes. This eliminates the need to disassemble the entire mold, simplifies maintenance operations, and reduces equipment downtime.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] 1. This utility model uses a trough system composed of a rice-shaped trough, a diversion trough, and conveying holes evenly distributed on the edge to achieve uniform material diversion from the center to each forming trough and synchronous feeding at multiple points. This effectively avoids the problems of local accumulation or incomplete filling caused by traditional single-channel feeding, and significantly improves the density uniformity and magnetic performance consistency of sintered NdFeB products.

[0015] 2. This utility model uses a circulating heating tank composed of intersecting horizontal and vertical circular channels, combined with a uniform auxiliary heating unit formed by the liquid inlet pipe and the liquid outlet pipe, which can achieve all-round uniform heating and heat preservation of the tank system and the material in the molding tank, avoid the decrease in material fluidity caused by local cooling, reduce molding defects, and ensure product molding quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the appearance of this utility model.

[0017] Figure 2 This is an exploded schematic diagram of this utility model.

[0018] Figure 3 This is a schematic diagram of the bottom surface of the mold base of this utility model.

[0019] Figure 4 This is a cross-sectional view of the present invention.

[0020] As shown in the figure: 1. Base; 2. Base plate; 3. Mold base; 4. Forming groove; 5. Material conveying groove; 6. Material conveying pipe; 7. Groove system; 71. Meter-shaped groove; 72. Diverting groove; 73. Conveying hole; 8. Uniform auxiliary heating unit; 81. Liquid inlet pipe; 82. Liquid outlet pipe; 83. Circulating heating tank; 84. Liquid discharge hole; 85. Thread. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 3As shown, a sintered NdFeB molding die includes a base 1. The top of the base 1 is fixedly connected to a base plate 2 by bolts. The base plate 2 is made of heat-resistant stainless steel, which can withstand long-term heating and is not easily deformed. The top surface is precisely connected to the mold base 3 by a positioning pin. The mold base 3 is made of high-strength mold steel, and the surface is quenched to improve wear resistance. Several forming grooves 4 are pre-reserved in the mold base 3 by milling. The shape and size of the forming grooves 4 are designed according to the target sintered NdFeB product.

[0024] The middle part of the base plate 2 is formed by drilling and milling to form a material conveying trough 5. The top of the material conveying trough 5 is in close contact with the bottom surface of the mold base 3 and connected to it. The bottom end is fixed by welding to a material conveying pipe 6, which is made of stainless steel. The other end is connected to the outlet of the external feeding equipment through a flange. The bottom surface of the mold base 3 is formed by milling to form a slot system 7. The slot system 7 includes a swivel 71, a diversion trough 72 and a conveying hole 73. The swivel 71 is located at the center of the bottom surface of the mold base 3 and is directly connected to the material conveying trough 5. The diversion trough 72 extends from the swivel 71 to each forming groove 4. Its cross-sectional shape is adapted to the edge contour of the forming groove 4. The conveying hole 73 is formed by drilling evenly along the edge of the forming groove 4 to ensure that the material can enter the forming groove 4 from multiple points on the edge.

[0025] See appendix Figure 2 Appendix Figure 3 and attached Figure 4 As shown, the uniform auxiliary heating unit 8 includes an inlet pipe 81, an outlet pipe 82, and a circulating heating tank 83. Both the inlet pipe 81 and the outlet pipe 82 are made of stainless steel and are fixed to both sides of the bottom surface of the base plate 2 by welding, and are connected to the inlet and outlet ports of the external temperature control equipment. The circulating heating tank 83 is formed in the base plate 2 by drilling and consists of several horizontal and vertical circular channels to ensure that the heating medium can uniformly cover the base plate 2. Drain holes 84 are formed around the base plate 2 by drilling. The drain holes 84 are connected to the circulating heating tank 83 and have threads tapped on the inner wall, which are threaded to the threaded connection 85. The thread 85 is made of brass and has good sealing performance and corrosion resistance.

[0026] In specific implementation of this utility model: the outlet of the external feeding device is connected to the conveying pipe 6 through a flange, and the inlet and outlet of the external temperature control device are connected to the inlet pipe 81 and the outlet pipe 82 respectively to ensure stable connection of the equipment. The feeding device and the temperature control device are started, and the feeding device conveys the sintered NdFeB raw material to the conveying trough 5 along the conveying pipe 6. After the raw material is collected in the conveying trough 5, it flows into the spherical groove 71 on the bottom surface of the mold base 3.

[0027] The swivel groove 71 evenly distributes the raw material to each distribution groove 72. The distribution groove 72 guides the flow of the raw material according to the shape of the forming groove 4. Finally, the raw material enters from multiple points on the edge of the forming groove 4 through the conveying hole 73, so as to achieve uniform filling of the raw material in the forming groove 4 and avoid the problems of local accumulation or insufficient filling. At the same time, the temperature control equipment delivers the heated medium (such as heat transfer oil) along the liquid inlet pipe 81 to the circulating heating tank 83. The medium circulates in the crisscrossing channels, evenly heating the base plate 2. The heat is conducted through the base plate 2 to the mold base 3 and the groove system 7, maintaining the temperature stability of the raw material and ensuring that the raw material always maintains good fluidity and ensuring the molding quality.

[0028] When it is necessary to replace the heating medium or clean the circulating heating tank 83, turn off the temperature control equipment, disconnect the inlet pipe 81 and outlet pipe 82 from the external equipment, unscrew the thread 85, and the residual medium or impurities in the circulating heating tank 83 will be discharged through the drain hole 84. After cleaning, tighten the thread 85 again and connect the external temperature control equipment to resume use. There is no need to disassemble the entire mold, which greatly shortens the maintenance time and ensures production continuity.

[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A sintered NdFeB forming mold, comprising a base (1), characterized in that: The base (1) has a base plate (2) on top, and a mold base (3) is provided on the base plate (2). Several forming grooves (4) are reserved in the mold base (3). A material conveying groove (5) communicating with the mold base (3) is provided in the middle of the base plate (2). A material conveying pipe (6) is connected to the bottom end of the material conveying groove (5). A slot system (7) for material forming is provided on the bottom surface of the mold base (3) communicating with the forming groove (4). The slot system (7) makes the material uniformly formed in the forming groove (4). The base plate (2) is provided with a uniform auxiliary heating unit (8) for heating and heat preservation of the material in the groove system (7) on the bottom surface of the mold base (3) to maintain the fluidity of the material.

2. The sintering NdFeB molding die according to claim 1, characterized in that: The slot system (7) includes a swivel-shaped slot (71) on the bottom surface of the mold base (3). The bottom surface of the mold base (3) is also provided with a number of diversion slots (72) that communicate with the swivel-shaped slot (71). The diversion slots (72) match the shape of each forming slot (4). A number of conveying holes (73) are provided between the diversion slots (72) and the corresponding forming slots (4).

3. The sintering NdFeB molding die according to claim 1, characterized in that: The uniform auxiliary heating unit (8) includes an inlet pipe (81) and an outlet pipe (82) disposed on the bottom surface of the base plate (2), and a circulating heating tank (83) connected to the inlet pipe (81) and the outlet pipe (82) is provided in the middle of the base plate (2).

4. The sintering NdFeB molding die according to claim 2, characterized in that: The conveying holes (73) are evenly distributed along the edge of the forming groove (4) to ensure that the material is spread evenly and uniformly in the forming groove (4).

5. A sintered NdFeB forming mold according to claim 3, characterized in that: The circulating heating tank (83) is composed of several interconnected circular channels arranged horizontally and vertically.

6. The sintering NdFeB molding die according to claim 3, characterized in that: The bottom plate (2) is provided with a drain hole (84) around its perimeter that communicates with the circulating heating tank (83), and the drain hole (84) is threaded with a thread (85).

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