Neodymium-iron-boron cylindrical magnet mold and demolding mechanism

Abstract

The utility model discloses a neodymium-iron-boron cylindrical magnet mold and a demolding mechanism, and relates to the technical field of neodymium-iron-boron magnet machining. The cylindrical magnet mold is divided into an upper mold and a lower mold, the opposite sides of the upper mold and the lower mold are provided with inwards-concave arc surfaces in a linear array, 25 cylindrical mold cavities are formed after mold closing and are installed on the upper pressing rod and the lower pressing rod through threaded holes respectively, and an auxiliary demolding structure is arranged on the cylindrical magnet mold. The demolding mechanism comprises an ejection assembly and a sliding assembly, the ejection assembly comprises an ejection rod assembly and a driving part, the ejection rod assembly is fixedly installed on the driving part, and the driving part drives an ejection rod frame to reciprocate left and right in the horizontal direction; the sliding assembly comprises a sliding rail and a sliding frame, the sliding frame is assembled on the sliding rail in a sliding mode, and the demolding mechanism is fixedly installed at the front end of the sliding frame. And a receiving device is arranged on the sliding frame. One-time forming and efficient demolding of multiple magnets are achieved, the magnets are prevented from being damaged, the automation degree is high, the production efficiency is remarkably improved, and the reject ratio is reduced.

Description

Technical Field

[0001] This utility model relates to the field of neodymium iron boron magnet processing technology, and in particular to a neodymium iron boron cylindrical magnet mold and demolding mechanism. Background Technology

[0002] Neodymium iron boron (NdFeB) magnets are widely used in motors, electronic components, and medical devices due to their excellent properties such as high energy product and high coercivity. Among them, rod-shaped NdFeB magnets are core components of micro-motors, sensors, and other devices. Cold pressing is a key manufacturing process for rod-shaped NdFeB magnets, and its core equipment is the cold pressing mold. To ensure the dimensional accuracy and molding consistency of the rod-shaped magnets, the industry generally adopts a double-die mating structure—that is, the left and right dies are mated to form an axially extending rod-shaped cavity. NdFeB powder is filled into the cavity and then pressed to form the magnet. This structure can effectively control the coaxiality and inner wall smoothness of the cavity, improving the shape accuracy of the molded part.

[0003] However, existing double-die cold pressing molds have significant technical drawbacks in practical applications, severely impacting product yield and production efficiency. First, after the cylindrical magnet is pressed into shape, strong adhesion forms between the cylindrical magnet mold and the inner wall of the die cavity, as well as the gap between the molded parts. This makes the surface of the molded part prone to tearing or edge damage during demolding. Second, existing demolding methods rely on manual demolding, resulting in low efficiency and safety.

[0004] In summary, the existing double-concave rod-shaped NdFeB cold-pressing molds have not effectively solved the problem of molded parts breakage and deformation caused by adhesion during the demolding process. The existing technology still has shortcomings and cannot meet the requirements of yield and production efficiency for industrial mass production. Therefore, there is an urgent need for a composite demolding structure that is simple in structure, low in modification cost, and can simultaneously solve the problem of mold seam adhesion, in order to fill the gap in the existing technology.

[0005] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0006] The main purpose of this utility model is to propose a neodymium iron boron cylindrical magnet mold and demolding mechanism to solve the technical problems of adhesion between the cylindrical magnet and the mold cavity surface after the cylindrical magnet is pressed and formed, which easily causes damage to the surface of the cylindrical magnet during demolding, and the low demolding efficiency of the cylindrical magnet.

[0007] Therefore, this utility model proposes a neodymium iron boron cylindrical magnet mold and a demolding mechanism.

[0008] Preferably, the present invention may also have the following technical features:

[0009] A neodymium iron boron cylindrical magnet mold includes a worktable and a cylindrical magnet mold. The worktable is provided with a pressing cavity. The cylindrical magnet mold includes an upper mold and a lower mold. The upper mold and the lower mold are respectively provided with concave arc surfaces on opposite sides. When the upper mold and the lower mold are closed, they are assembled in the pressing cavity of the worktable to form a closed pressing area. The concave arc surfaces form mold cavities respectively. The upper mold and the lower mold are respectively fixedly connected to an upper pressure rod and a lower pressure rod.

[0010] Furthermore, both the upper and lower molds are cuboids of the same size, and the concave arc surfaces of the upper mold and the lower mold are respectively set to correspond one-to-one, forming a cylindrical mold cavity after the molds are closed. There are 25 mold cavities.

[0011] Furthermore, it also includes an auxiliary demolding structure, which includes micro-air holes, a common air blowing pipe, and an air source interface channel. There are multiple micro-air holes, which are located on the inner wall of the concave arc surface. The common air blowing pipe is arranged along the length direction of the upper and lower molds and communicates with the micro-air holes. The air source interface channel is located at the end of the upper and lower molds away from the concave arc surface and is perpendicular to the common air blowing pipe.

[0012] Furthermore, the micro-pores on the inner wall of each cylindrical mold cavity are distributed on both sides along the length of the concave arc surface, and the diameter of the micro-pores is 0.2 mm.

[0013] A demolding mechanism for a mold using neodymium iron boron cylindrical magnets further includes a demolding mechanism comprising an ejection assembly and a sliding assembly. The sliding assembly includes a slide rail and a carriage, the carriage being slidably mounted on the slide rail, and the ejection assembly being fixedly mounted on the carriage. The ejection assembly includes an ejector rod assembly and a driving member, the ejector rod assembly being configured in a one-to-one correspondence with the mold cavity, and the driving member driving the ejector rod assembly to reciprocate, ejecting the neodymium iron boron cylindrical magnets from the mold cavity.

[0014] Furthermore, the push rod assembly includes a push rod and a push rod frame, the push rod being perpendicular to the push rod frame, and the contact surface of the push rod facing the magnet being a planar pushing surface.

[0015] Furthermore, the driving component is a cylinder, and the cylinder drives the push rod assembly to move back and forth horizontally.

[0016] Furthermore, it also includes a receiving device, which includes a mounting plate, a connecting rod, and a receiving plate; one end of the connecting rod is connected to the mounting plate, and the other end is connected to the receiving plate, and the mounting plate is mounted on the carriage.

[0017] Furthermore, the upper surface of the receiving plate is provided with a plurality of circular positioning grooves, the number of which is consistent with the number of concave arc surfaces, and the inner diameter of the positioning grooves is adapted to the outer diameter of the cylindrical magnet.

[0018] Furthermore, the upper surface of the receiving plate and the upper surface of the lower mold when it is raised to its highest point are on the same horizontal plane, and the positioning groove of the receiving plate is coaxially aligned with the axis of the concave arc surface of the lower mold.

[0019] The beneficial effects of this utility model compared with the prior art include:

[0020] The integrated mold cavity layout allows for the molding of 25 uniform cylindrical magnets in a single press, improving production efficiency compared to traditional cavity molds. Under the same production capacity requirements, it can reduce the frequency of equipment startup and continuous operation time, reduce fixed costs such as equipment depreciation and power consumption, significantly compress the marginal cost of large-scale production, and enhance the product's market competitiveness.

[0021] The auxiliary demolding structure solves demolding defects at the source and greatly improves the product qualification rate. It uses micro-pores evenly distributed at the bottom of the cavity to blow air through the micro-pores before demolding, which precisely counteracts the adsorption force between the cavity and the magnet.

[0022] The planar pushing surface is completely in contact with the end face of the magnet, and the pushing force is evenly applied to the entire magnet without local stress concentration.

[0023] The receiving plate with positioning grooves has groove dimensions that precisely match the outer diameter and height of the cylindrical magnet. Each groove can only accommodate one magnet, achieving one-to-one precise positioning of the magnet after demolding.

[0024] The automated demolding is achieved by using a cylinder-driven push mechanism, and the carriage module drives the receiving plate to complete the automated transfer without human intervention. The automated action response speed is stable, without the random errors of manual operation. In addition, the operator stays away from dangerous work positions such as mold opening and closing and push, eliminating safety hazards such as mechanical extrusion and falling heavy objects, which meets the safety standards of intelligent manufacturing. Attached Figure Description

[0025] Figure 1 This is an overall front view of the present invention.

[0026] Figure 2 This is an overall side view of the present invention.

[0027] Figure 3 This is a top view of the carriage and demolding mechanism of this utility model.

[0028] Figure 4 This is a top view of the slide rail and worktable of this utility model.

[0029] Figure 5This is a cross-sectional view of the cylindrical magnet mold of this utility model.

[0030] Figure 6 This is a side sectional view of the cylindrical magnet mold of this utility model. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0032] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0033] like Figure 1-6 The diagram illustrates a neodymium iron boron cylindrical magnet mold, comprising a cylindrical magnet mold 1 and a worktable 29. The worktable 29 has a pressing cavity 30, which mates with a lower mold 3. When the upper mold 2 and lower mold 3 are closed, a closed region is formed within the pressing cavity 30 of the worktable 29. The cylindrical magnet mold 1 is divided into an upper mold 2 and a lower mold 3, which have identical structures and are mirror images of each other. A linear array of magnets is provided on the opposite side of the upper mold 2 and lower mold 3. Multiple concave arc surfaces 4, when the upper mold 2 and the lower mold 3 are closed, the concave arc surface 4 of the upper mold 2 and the concave arc surface 4 of the lower mold 3 form a cylindrical mold cavity, the size of which is the size of the cylindrical magnet; the upper mold 2 and the lower mold 3 are provided with threaded holes 5 on opposite sides, the upper mold 2 and the lower mold 3 are fixedly installed on the upper pressure rod 6 and the lower pressure rod 7 respectively through the threaded holes 5, the upper pressure rod 6 and the lower pressure rod 7 are driven by a hydraulic device to complete the opening and closing of the cylindrical magnet mold 1.

[0034] like Figure 5-6 The upper mold 2 and lower mold 3 shown are both cuboids of the same size. The concave arc surface 4 of the upper mold 2 and the concave arc surface 4 of the lower mold 3 are set one-to-one. After the molds are closed, a cylindrical mold cavity is formed, which ensures that the inner wall of the mold cavity is smooth and regular, and guarantees the shape accuracy and surface finish of the magnet. There are 25 mold cavities, which significantly improves the output per unit time.

[0035] like Figure 5-6The diagram also includes an auxiliary demolding structure 18, which works in conjunction with the ejector assembly 9 to further improve demolding smoothness and prevent the magnet from adhering to the inner wall of the mold cavity. The auxiliary demolding structure 18 consists of multiple micro-air holes 19 on the inner wall of the cylindrical mold cavity. Gas is ejected before the ejector rod demolds the cylindrical magnet, reducing the friction between the cylindrical magnet and the mold cavity and providing an auxiliary pushing force to the cylindrical magnet. The upper mold 2 and the lower mold 3 are equipped with a common air blowing pipe 20 along their length. The blowing pipe 20 is used to evenly distribute gas to each micro air hole 19 to ensure consistent air pressure. The blowing pipe 20 is connected to the micro air holes 19. The upper mold 2 and the lower mold 3 have air source interface channels 21 on opposite end faces of the concave arc surface 4. The air source interface channels 21 are perpendicular to the blowing pipe 20. The micro air holes on the inner wall of each cylindrical mold cavity are distributed on both sides along the length of the concave arc surface, which can realize multiple air outlets. The diameter of the micro air holes is 0.2mm.

[0036] like Figure 1-4 The demolding mechanism shown includes a demolding mechanism 8 for a neodymium iron boron cylindrical magnet mold. The demolding mechanism 8 automatically completes the demolding operation after the magnet is formed, replacing manual operation to reduce labor intensity and improve production safety. The demolding mechanism 8 includes an ejector assembly 9 and a sliding assembly 10. The ejector assembly 9 includes an ejector rod 22, an ejector rod holder 12, and a cylinder 13. The cylinder 13 provides a power source to drive the ejector rod holder 12, causing it to move left and right after the magnet is formed to complete the demolding. The ejector rod assembly 11 is divided into a left ejector rod assembly 14 and a right ejector rod assembly 15, both of which are fixedly mounted on the cylinder 13. The cylinder 13 drives the ejector frame 12 to move back and forth horizontally. The ejector frame 12 serves to integrate and fix the ejector rods, ensuring that all ejector rods move synchronously. The distance between the left ejector rod assembly 14 and the right ejector rod assembly 15 is greater than the length of the cylindrical magnet. The sliding assembly 10 includes a slide rail 16 and a slide frame 17. The slide frame 17 is slidably mounted on the slide rail 16. The ejector assembly 9 is fixedly installed at the front end of the slide frame 17, so that the ejector rod assembly 11 corresponds to the concave arc surface of the lower mold 3. The sliding assembly 10 can drive the demolding mechanism 8 to flexibly adjust the working position, ensuring that the ejector rod 22 is accurately aligned with the mold cavity. After demolding, it can also drive the mechanism away from the mold, leaving space for the next mold closing.

[0037] like Figure 1-4 The cylinder 13 shown is fixedly installed at the front end of the slide 17, located on the right side of the receiving plate 27. This layout makes the force transmission path direct and smooth, while the structure is compact and does not interfere with other components, ensuring that all mechanisms work together.

[0038] like Figure 1-4The number of ejector pins in the left ejector pin assembly 14 and the right ejector pin assembly 15 shown is consistent with the number of arc surfaces, and each ejector pin is set in a one-to-one correspondence with the concave arc surface, so as to realize the synchronous demolding of magnets in all mold cavities, which is in line with the concept of multi-cavity batch production and further improves efficiency. The ejector pin 22 is perpendicular to the ejector pin frame 12. The lower end of the ejector pin is provided with a flat pushing surface 23. The design of the flat pushing surface 23 can increase the contact area between the pushing surface 23 and the cylindrical magnet, so that the pushing force is evenly distributed, avoiding excessive local pressure that causes the magnet end face to be concave and chipped, while improving the pushing stability and preventing the ejector pin from slipping.

[0039] like Figure 1-4 The diagram also includes a receiving device 24, which is configured to receive the cylindrical magnet pushed out by the demolding mechanism 8 and facilitate the next step of transfer. The receiving device 24 includes a mounting plate 25, connecting rods 26 and a receiving plate 27. There are four connecting rods 26, one end of which is connected to the mounting plate 25 and the other end is connected to the receiving plate 27. The mounting plate 25 is mounted on the carriage 17.

[0040] like Figure 1-4 The receiving plate 27 shown has multiple circular positioning grooves 28 on its end face facing the cylindrical magnet mold 1. The positioning grooves 28 are used to accurately position and separate the magnets, preventing them from colliding and scratching each other. The number of positioning grooves 28 is the same as the number of concave arc surfaces, enabling one-to-one magnet reception and matching the synchronous demolding rhythm. The inner diameter of the positioning grooves 28 is adapted to the outer diameter of the cylindrical magnet, which can stably accommodate the magnet and prevent rolling deviation during movement. The upper end face of the receiving plate 27 and the upper end face of the lower mold 3 when it is raised to the highest point are on the same horizontal plane, and the positioning grooves 28 are aligned with the axis of the concave arc surface 4 of the lower mold 3.

[0041] like Figure 1-6The NdFeB cylindrical magnet mold and demolding mechanism shown herein are used as follows: A lower hydraulic rod lowers the lower mold to a designated position in the pressing cavity, filling it with NdFeB powder. A hydraulic device drives the upper and lower pressure rods to close the upper and lower molds, respectively. The linear array of concave arc surfaces on their opposing sides precisely aligns to form 25 cylindrical mold cavities, pressing the filled NdFeB powder. After pressing, the hydraulic device simultaneously lifts the upper and lower molds. The lower mold stops lifting when the concave arc surface of the lower mold aligns with the positioning groove of the receiving plate at a preset height, while the upper mold continues to lift until it does not interfere with the forward and backward sliding of the carriage, completing the next demolding action. After the mold opening action is completed, an air source is connected through the air source interface channel. Gas is diverted through the common air pipe to the micro-air holes on both sides of the inner wall of the mold cavity and ejected, counteracting the attraction between the magnet and the mold cavity. At the same time, the carriage moves along the slide rail to precisely align the demolding mechanism, and the upper surface of the receiving plate remains flush with the upper surface of the lower mold raised to its highest point. Then, the cylinder drives the ejector frame to move the ejector assembly. The right ejector assembly pushes the cylindrical magnet onto the receiving plate, and the magnet falls precisely into the positioning groove on the receiving plate that matches its outer diameter. After the cylindrical magnet is transferred to the receiving plate, the carriage drives the receiving device and the magnet to continue sliding forward along the slide rail. After sliding until the receiving plate is aligned with the cylindrical magnet placement platform, the cylinder drives the ejector frame to reset, and the left ejector assembly pushes the cylindrical magnet onto the placement platform, completing the entire process from pressing to demolding.

[0042] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0043] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A neodymium iron boron cylindrical magnet mold, characterized in that: The system includes a workbench (29) and a cylindrical magnet mold (1); the workbench (29) is provided with a pressing cavity (30); the cylindrical magnet mold (1) includes an upper mold (2) and a lower mold (3), and the upper mold (2) and the lower mold (3) are respectively provided with concave arc surfaces (4) on opposite sides; when the upper mold (2) and the lower mold (3) are closed, they are assembled in the pressing cavity (30) of the workbench (29) to form a closed pressing area, and the concave arc surface (4) forms a corresponding mold cavity; the upper mold (2) and the lower mold (3) are respectively fixedly connected to an upper pressing rod (6) and a lower pressing rod (7).

2. The neodymium iron boron cylindrical magnet mold as described in claim 1, characterized in that: The upper mold (2) and the lower mold (3) are both cuboids of the same size. The concave arc surface (4) of the upper mold (2) and the concave arc surface (4) of the lower mold (3) are set one-to-one. After the molds are closed, a cylindrical mold cavity is formed. There are 25 mold cavities.

3. The neodymium iron boron cylindrical magnet mold as described in claim 2, characterized in that: It also includes an auxiliary demolding structure (18), which includes micro air holes (19), an air blowing pipe (20), and an air source interface channel (21). There are multiple micro air holes (19), which are located on the inner wall of the concave arc surface (4). The air blowing pipe (20) is arranged along the length direction of the upper mold (2) and the lower mold (3) and is connected to the micro air holes (19). The air source interface channel (21) is located at one end of the upper mold (2) and the lower mold (3) away from the concave arc surface (4) and is perpendicular to the air blowing pipe (20).

4. The neodymium iron boron cylindrical magnet mold as described in claim 3, characterized in that: The micro-pores (19) on the inner wall of each cylindrical mold cavity are distributed on both sides along the length of the concave arc surface (4), and the diameter of the micro-pores (19) is 0.2 mm.

5. A demolding mechanism for a neodymium iron boron cylindrical magnet mold according to any one of claims 1-4, characterized in that: It also includes a demolding mechanism (8), which includes an ejection assembly (9) and a sliding assembly (10). The sliding assembly (10) includes a slide rail (16) and a carriage (17). The carriage (17) is slidably mounted on the slide rail (16), and the ejection assembly (9) is fixedly mounted on the carriage (17). The ejection assembly (9) includes an ejector rod assembly (11) and a driving member. The ejector rod assembly (11) is arranged in a one-to-one correspondence with the mold cavity. The driving member drives the ejector rod assembly (11) to reciprocate and eject the neodymium iron boron cylindrical magnet in the mold cavity.

6. The demolding mechanism of the neodymium iron boron cylindrical magnet mold as described in claim 5, characterized in that: The push rod assembly (11) includes a push rod (22) and a push rod frame (12). The push rod (22) is perpendicular to the push rod frame (12), and the contact surface of the push rod (22) facing the magnet is set as a planar pushing surface (23).

7. The demolding mechanism of the neodymium iron boron cylindrical magnet mold as described in claim 5, characterized in that: The driving component is a cylinder (13), which drives the push rod assembly (11) to move back and forth in the horizontal direction.

8. The demolding mechanism of the neodymium iron boron cylindrical magnet mold as described in claim 5, characterized in that: It also includes a receiving device (24), which includes a mounting plate (25), a connecting rod (26) and a receiving plate (27); one end of the connecting rod (26) is connected to the mounting plate (25) and the other end is connected to the receiving plate (27), and the mounting plate (25) is mounted on the carriage (17).

9. The demolding mechanism of the neodymium iron boron cylindrical magnet mold as described in claim 8, characterized in that: The upper surface of the receiving plate (27) is provided with a plurality of circular positioning grooves (28). The number of positioning grooves (28) is the same as the number of concave arc surfaces (4), and the inner diameter of the positioning grooves (28) is adapted to the outer diameter of the cylindrical magnet.

10. The demolding mechanism of the neodymium iron boron cylindrical magnet mold as described in claim 9, characterized in that: The upper surface of the receiving plate (27) and the upper surface of the lower mold (3) when it is raised to the highest point are on the same horizontal plane, and the positioning groove (28) of the receiving plate (27) is coaxially aligned with the axis of the concave arc surface (4) of the lower mold (3).

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