Motor magnetic tile injection production mold and production method

Abstract

This invention discloses an injection molding die for motor magnets, comprising a lower mold assembly and an upper mold assembly. The lower mold assembly includes a first mold part and a first cavity disposed on the first mold part. The upper mold assembly includes a second mold part for use with the first mold part. The second mold part has a second cavity disposed on the side near the first mold part. The second cavity is recessed from the second mold part and communicates with the first cavity. This achieves the effect of concentrating the mold parting marks generated during the injection molding process at the annular protrusion structure, thereby reducing the formation of mold parting lines and burrs on the inner and outer annular walls of the injection molded part and improving product yield.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold and production method for motor magnets. Background Technology

[0002] An electric motor rotor typically consists of a rotor core, magnets, and a plastic frame for fixing the magnets. To improve the bonding strength and assembly efficiency between the magnets and the plastic frame, current production processes usually employ injection molding to encapsulate and fix multiple magnets into a magnet assembly. During injection molding, several magnets are pre-placed in the mold cavity, and then molten material is injected into the cavity, allowing the molten material to encapsulate the magnets and form a monolithic structure after cooling.

[0003] Existing injection molding molds for magnetic tiles typically form an annular injection cavity through the cooperation of upper and lower molds. Due to the structural characteristics of the cavity, the mold parting area usually corresponds to the inner and outer annular walls of the product. When the molten material fills the cavity and is molded under holding pressure, the molten material easily forms mold-closing marks along the parting area. With the increase in the number of times the mold is used, parting lines (i.e., burrs) are prone to appear in the parting area, thus affecting the appearance quality of the product and subsequent assembly performance. Therefore, how to reduce the formation of parting lines and burrs on the inner and outer annular walls of the product has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides an injection molding mold and production method for motor magnet tiles.

[0005] The technical solution adopted by this invention to solve its technical problem is: The present invention provides an injection molding mold for producing motor magnets, including a lower mold assembly and an upper mold assembly; the lower mold assembly includes a first mold and a first cavity disposed on the first mold, and the upper mold assembly includes a second mold for use in conjunction with the first mold, the second mold having a second cavity disposed on the side near the first mold, the second cavity being recessed from the second mold and communicating with the first cavity.

[0006] Preferably, both the first and second cavities are annularly shaped. The second mold has several gates connected to the second cavity for injecting molten material into the cavity via external injection molding equipment. The several gates are arranged in a annular array along the second cavity. By arranging the several gates in a annular array along the second cavity, the molten material can be injected into the cavity through multiple gates, shortening the flow distance of the molten material and improving the uniformity of material filling in the cavity. This helps to reduce problems such as local missing glue, uneven filling, and differences in molding shrinkage.

[0007] Preferably, the radial opening dimension of the second cavity is smaller than that of the first cavity, the inner ring wall diameter of the second cavity is larger than that of the first cavity, and the outer ring wall diameter of the second cavity is smaller than that of the first cavity. This is to form an annular protrusion structure on the top of the injection molded part. The second cavity and the first cavity form a radially misaligned structure, so that an annular protrusion is formed on the top of the injection molded part. This can concentrate the mold parting marks generated during the injection molding process as much as possible in the annular protrusion area, thereby reducing the possibility of the inner and outer ring walls of the product forming parting lines, thus improving the appearance quality and fit performance of the product.

[0008] Preferably, the second mold is provided with a first limiting member and a second limiting member. The first limiting member is located within the inner space formed by the annular second cavity, and the second limiting member is located on the outer side of the second cavity. The first and second limiting members protrude from the second mold towards the side closer to the first mold. Correspondingly, the first mold is provided with a cavity groove for accommodating the first and second limiting members. The first and second limiting members are located on the inner and outer sides of the second cavity, respectively, and cooperate with the cavity groove on the first mold. This can guide and limit the relative position of the upper and lower molds, improve the mold closing positioning accuracy, and avoid mold offset from affecting the product dimensional accuracy.

[0009] Preferably, the second module has a plurality of first rods arranged in a ring array along the second cavity; the first module has a plurality of second rods for use with the first rods, the plurality of second rods being located inside the first cavity and on the side close to the outer wall of the first cavity, the plurality of second rods being arranged in a ring array along the first cavity, and there is a gap between two adjacent second rods for accommodating external magnetic tiles, the first rods and the second rods cooperate to form a magnetic tile mounting area, and cooperate to form a through hole for penetrating the molded product, which helps to optimize the product's stress structure while reducing the product's weight, and facilitates the subsequent clamping and installation of the product.

[0010] Preferably, the first mold has a third cavity. The first cavity is annularly formed, and the third cavity is recessed from the outer wall of the first cavity. The third cavity is formed along the length of the first cavity and is connected to the first cavity. The third cavity is used to accommodate and limit one end of the external magnetic tile in the thickness direction. The third cavity is used to accommodate one end of the magnetic tile in the thickness direction, so that the magnetic tile can be supported and positioned in the radial direction, thereby reducing the risk of displacement of the magnetic tile caused by the impact of molten material during injection molding and improving the positional accuracy of the magnetic tile.

[0011] Preferably, the first mold has a groove, the first cavity is annular, the groove is cut from the inner wall of the first cavity, the groove is cut along the length of the first cavity and is connected to the first cavity, the groove is used to cooperate with the third cavity to accommodate and limit the two ends of the outer magnetic tile in the thickness direction, the groove and the third cavity respectively correspond to the two ends of the magnetic tile in the thickness direction, which can form a matching limiting structure for the two sides of the magnetic tile, so that the magnetic tile maintains a stable posture during injection molding, thereby further improving the accuracy of the magnetic tile installation position.

[0012] Preferably, the production mold also includes a base, with the lower mold assembly fixedly mounted on the base. The upper mold assembly is driven by an external drive component to move closer to or further away from the lower mold assembly, so that the first cavity and the second cavity cooperate to form a closed injection molding cavity, thereby realizing the injection molding of the magnetic tile assembly. The lower mold assembly is installed and supported by the base, and the upper mold assembly is driven by an external drive component to perform mold opening and closing movements, which can achieve stable cooperation between the first cavity and the second cavity and meet the needs of continuous injection molding production of magnetic tile assemblies.

[0013] Preferably, the base is provided with a demolding assembly, which includes a plate and an ejector pin on the plate. The end of the ejector pin is driven to extend into the first cavity to eject the molded product. The ejector pin can eject the molded product from the first cavity after the mold is opened, thereby reducing the risk of product surface damage and improving demolding efficiency.

[0014] A method for injection molding production of motor magnets includes the following steps: S1. Place several magnetic tiles inside the first cavity; S2. Drive the upper mold assembly closer to the lower mold assembly, so that the second mold part and the first mold part cooperate to close the mold, and the second cavity and the first cavity together form an injection cavity for covering the magnetic tile; S3. Molten material is injected into the injection cavity through the gating port, so that the molten material covers the magnetic tile and fills the first cavity and the second cavity; S4. The second cavity is used to form an annular protrusion structure on the top of the injection molded part, and the inner and outer ring walls of the injection molded part are lowered to form the parting line. S5. After the molten material cools and solidifies, the upper mold assembly is driven to open, and the molded product is ejected through the ejector pin. By first positioning the magnetic tile, and then using the first cavity and the second cavity to form a closed injection molding cavity to cover and mold the magnetic tile, not only can the integrated manufacturing of the magnetic tile and the plastic structure be realized, but also the annular protrusion structure formed by the second cavity can reduce the possibility of forming parting lines in the functional areas of the product, thereby improving the molding quality and product yield of the magnetic tile assembly.

[0015] The beneficial effects of this invention are: This technology involves setting a second cavity on the second mold that is connected to the first cavity, so that the first cavity and the second cavity together constitute the injection molding cavity. The second cavity forms an annular protrusion structure on the top of the injection molded part, thereby changing the flow path of the molten material in the parting area. This makes it less likely for the molten material to overflow along the corresponding areas of the inner and outer ring walls of the injection molded part. This concentrates the mold closing marks generated during the injection molding process at the annular protrusion structure, thereby reducing the formation of mold closing lines and burrs on the inner and outer ring walls of the injection molded part and improving product yield. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the injection molding mold of the present invention; Figure 2 This is a schematic diagram of the upper mold assembly of the present invention; Figure 3 This is a schematic diagram of the structure of the lower mold assembly of the present invention; Figure 4 This is a plan view of the first module of the present invention; Figure 5 This is an exploded view of the injection molding mold of the present invention; Figure 6 This is one of the structural schematic diagrams of the cavity of the present invention; Figure 7 This is the second schematic diagram of the cavity structure of the present invention; Figure 8 This is a schematic diagram of the structure of the product produced by the injection molding mold of this invention.

[0019] The reference numerals in the figures include: 1. Lower mold assembly; 2. Upper mold assembly; 3. Base; 11. First mold piece; 12. First cavity; 13. Second rod; 14. Third cavity; 15. Groove; 21. Second mold piece; 211. First limiting member; 212. Second limiting member; 213. Third limiting member; 22. Second cavity; 23. First rod; 24. Sprue; 25. Limiting protrusion; 31. Plate body; 32. Ejector pin. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0021] In the description of this application, terms such as "first" and "second" are used only to distinguish different objects, not to describe a specific order. Furthermore, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0022] The terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0023] In this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0024] It is understood that in this application, "when," "if," and "if" all refer to the device making a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment action when it is implemented, nor do they imply any other limitations.

[0025] In this application, the use of singular representations for elements is intended to indicate "one or more" rather than "one and only one," unless otherwise specified.

[0026] It is understood that in the embodiments of this application, "B corresponding to A" means that there is a correspondence between A and B, and B can be determined based on A. Determining B based on A does not mean that B can be determined solely based on A; B can also be determined based on A and / or other information.

[0027] Example 1 Reference Figures 1 to 8 A type of injection molding mold for producing motor magnets includes a lower mold assembly 1 and an upper mold assembly 2. The lower mold assembly 1 includes a first mold 11 and a first cavity 12 disposed on the first mold 11. The upper mold assembly 2 includes a second mold 21 for use in conjunction with the first mold 11. The second mold 21 has a second cavity 22 on the side near the first mold 11. The second cavity 22 is recessed from the second mold 21 and communicates with the first cavity 12.

[0028] In this embodiment, the external magnetic tile is a hexagonal prism structure used in conjunction with the groove 15 and the third cavity 14.

[0029] With the above-described structural configuration, in use, this technology provides a second cavity 22 on the second mold 21 that is connected to the first cavity 12, so that the first cavity 12 and the second cavity 22 together constitute the injection molding cavity. The second cavity 22 forms an annular protrusion structure on the top of the injection molded part, thereby changing the flow path of the molten material in the parting area. This makes it less likely for the molten material to overflow along the corresponding areas of the inner and outer ring walls of the injection molded part. This concentrates the mold closing marks generated during the injection molding process at the annular protrusion structure, thereby reducing the formation of mold closing lines and burrs on the inner and outer ring walls of the injection molded part and improving product yield.

[0030] After the second cavity 22 forms an annular protrusion structure, when the molten material overflows outward along the parting surface, it needs to pass through the transition area corresponding to the annular protrusion structure. The equivalent leakage path of the parting surface increases, the local leakage channel narrows, and the flow resistance of the molten material in the parting micro-slit increases. Since the formation of burrs depends on the overflow of molten material from the parting micro-slit, the burrs at the inner and outer annular walls can be significantly reduced. According to the slit flow theory, the leakage amount of molten material along the parting surface is proportional to the cube of the parting gap and inversely proportional to the leakage path length. Therefore, by increasing the leakage path length, the tendency of molten material to seep outward from the parting surface can be effectively reduced, and the formation of burrs can be reduced. At the same time, when the molten material flows outward from the parting surface, it needs to pass through the turning transition area corresponding to the annular protrusion, the flow direction changes, the local flow resistance increases, and the equivalent leakage path is lengthened, thereby reducing the tendency of molten material to seep into the parting surface micro-slit and reducing the formation of burrs.

[0031] Specifically, both the first cavity 12 and the second cavity 22 are annularly arranged. The second mold 21 is provided with several gating ports 24, which are connected to the second cavity 22 and are used to inject molten material into the cavity via external injection molding equipment. The several gating ports 24 are arranged in a annular array along the second cavity 22. By arranging the several gating ports 24 in an annular array along the second cavity 22, the molten material can enter the injection cavity simultaneously from multiple positions, shortening the flow distance of the molten material and improving the uniformity of material filling in the cavity. This helps to reduce problems such as local missing glue, uneven filling, and differences in molding shrinkage.

[0032] Specifically, the radial opening dimension of the second cavity 22 is smaller than that of the first cavity 12, the inner ring wall diameter of the second cavity 22 is larger than that of the first cavity 12, and the outer ring wall diameter of the second cavity 22 is smaller than that of the first cavity 12. This is to form an annular protrusion structure on the top of the injection molded part. The second cavity 22 and the first cavity 12 form a radially misaligned structure, so that an annular protrusion is formed on the top of the injection molded part. This can concentrate the mold parting marks generated during the injection molding process as much as possible in the annular protrusion area, thereby reducing the possibility of forming parting lines on the functional surfaces such as the inner and outer ring walls of the product, thus improving the appearance quality and fit performance of the product.

[0033] Specifically, the second module 21 is provided with a first limiting member 211 and a second limiting member 212. The first limiting member 211 is located within the inner space formed by the annular second cavity 22, and the second limiting member 212 is located on the outer side of the second cavity 22. The first limiting member 211 and the second limiting member 212 protrude from the second module 21 toward the side closer to the first module 11. The first module 11 is provided with corresponding cavities for accommodating the first limiting member 211 and the second limiting member 212. The first limiting member 211 and the second limiting member 212 are located on the inner and outer sides of the second cavity 22, respectively, and cooperate with the cavities on the first module 11. This can guide and limit the relative position of the upper and lower molds, improve the mold closing positioning accuracy, and avoid mold offset from affecting the product dimensional accuracy.

[0034] The second module 21 is also provided with a third limiting member 213 for use in conjunction with the second limiting member 212. The third limiting member 213 is located on the outside of the second cavity 22 and is arranged intersecting with the second limiting member 212. Both the second limiting member 212 and the third limiting member 213 are strip-shaped. The length direction of the second limiting member 212 and the length direction of the third limiting member 213 intersect at an angle of 90 degrees. The corresponding first module 11 is provided with a strip-shaped protrusion for use in conjunction with the third limiting member 213.

[0035] The product described in this technical solution is a magnetic tile assembly obtained through injection molding.

[0036] Specifically, the second module 21 is provided with a plurality of first rods 23, which are arranged in a ring array along the second cavity 22; the first module 11 is provided with second rods 13 for use with the first rods 23, which are located in the first cavity 12 and on the side close to the outer wall of the first cavity 12. The second rods 13 are arranged in a ring array along the first cavity 12, and there is a gap between two adjacent second rods 13 for accommodating external magnetic tiles. The first rods 23 and the second rods 13 cooperate to form a magnetic tile installation area and cooperate to form a through hole for penetrating the molded product. This is beneficial for optimizing the product's stress structure while reducing the product's weight and facilitating subsequent clamping and installation of the product.

[0037] Specifically, the first mold 11 is provided with a third cavity 14. The first cavity 12 is annularly opened, and the third cavity 14 is recessed from the outer wall of the first cavity 12. The third cavity 14 is opened along the length direction of the first cavity 12 and is connected to the first cavity 12. The third cavity 14 is used to accommodate and limit one end of the external magnetic tile in the thickness direction. The third cavity 14 is used to accommodate one end of the magnetic tile in the thickness direction, so that the magnetic tile can be supported and positioned in the radial direction, thereby reducing the risk of displacement of the magnetic tile caused by the impact of molten material during injection molding and improving the positional accuracy of the magnetic tile.

[0038] It is worth noting that the arc area of ​​the third cavity 14 is smaller than the arc area of ​​the magnetic tile at one end in the corresponding thickness direction, so that the molten material can fully cover and limit the external magnetic tile.

[0039] Specifically, the first module 11 is provided with a groove 15, and the first cavity 12 is annularly opened. The groove 15 is cut from the inner wall of the first cavity 12. The groove 15 is cut along the length direction of the first cavity 12 and is connected to the first cavity 12. The groove 15 is used to cooperate with the third cavity 14 to accommodate and limit the two ends of the outer magnetic tile in the thickness direction. The groove 15 and the third cavity 14 correspond to the two ends of the magnetic tile in the thickness direction, which can form a matching limiting structure for the two sides of the magnetic tile, so that the magnetic tile maintains a stable posture during the injection molding process, thereby further improving the accuracy of the magnetic tile installation position.

[0040] Specifically, the production mold also includes a base 3, with the lower mold assembly 1 fixedly mounted on the base 3. The upper mold assembly 2 is driven by an external drive component to move closer to or further away from the lower mold assembly 1, so that the first cavity 12 and the second cavity 22 cooperate to form a closed injection molding cavity, thereby realizing the injection molding of the magnetic tile assembly. The lower mold assembly 1 is installed and supported by the base 3, and the upper mold assembly 2 is driven by an external drive component to perform mold opening and closing movements, which can achieve a stable fit between the first cavity 12 and the second cavity 22, meeting the needs of continuous injection molding production of magnetic tile assemblies.

[0041] Specifically, the base 3 is provided with a demolding assembly, which includes a plate 31 and an ejector pin 32 provided on the plate 31. The end of the ejector pin 32 is driven to extend into the first cavity 12 to eject the molded product. The ejector pin 32 can eject the molded product from the first cavity 12 after the mold is opened, thereby reducing the risk of product surface damage and improving demolding efficiency.

[0042] The plate component 31 is driven by an external driving component to drive the ejector pin 32 to reciprocate. The base 3 is U-shaped and located in the outside. The plate component 31 is slidably mounted on the base 3. A return spring is also provided between the plate component 31 and the lower mold assembly 1. This technical solution can solve the technical problem by means of the above-mentioned technical features. Therefore, other technologies known to those skilled in the art will not be described in detail.

[0043] A method for injection molding production of motor magnets includes the following steps: S1. Place several magnetic tiles inside the first cavity 12; S2. Drive the upper mold assembly 2 closer to the lower mold assembly 1, so that the second mold 21 and the first mold 11 cooperate to close the mold, and the second cavity 22 and the first cavity 12 together form an injection cavity for covering the magnetic tile; S3. Molten material is injected into the injection cavity through the gating port 24, so that the molten material covers the magnetic tile and fills the first cavity 12 and the second cavity 22; S4. The second cavity 22 is used to form an annular protrusion structure on the top of the injection molded part, and the inner and outer ring walls of the injection molded part are lowered to form the parting line. S5. After the molten material cools and solidifies, drive the upper mold assembly 2 to open and eject the molded product through the ejector pin 32. By first positioning the magnetic tile, and then using the first cavity 12 and the second cavity 22 to form a closed injection molding cavity to cover and mold the magnetic tile, not only can the integrated manufacturing of the magnetic tile and the plastic structure be realized, but also the annular protrusion structure formed by the second cavity 22 can reduce the possibility of forming parting lines in the functional areas of the product, thereby improving the molding quality and product yield of the magnetic tile assembly.

[0044] Example 2 Embodiment 2 of this application can be implemented alone or in combination with Embodiment 1 described above, and this application does not impose any restrictions.

[0045] A mold for injection molding motor magnets includes a lower mold assembly 1 and an upper mold assembly 2. The lower mold assembly 1 includes a first mold 11 and a first cavity 12 disposed on the first mold 11. The upper mold assembly 2 includes a second mold 21 for use in conjunction with the first mold 11. The second mold 21 has a second cavity 22 on the side near the first mold 11. The second cavity 22 is recessed from the second mold 21 and communicates with the first cavity 12.

[0046] The second module 21 is also provided with a limiting protrusion 25 on the side near the first module 11. The limiting protrusion 25 is formed by protrusion from the second module 21. The number of limiting protrusions 25 is equal to that of the external magnetic tiles. There must be at least a gap between two adjacent limiting protrusions 25 for the flow of molten material. The end of the limiting protrusion 25 away from the second module 21 abuts against the external magnetic tiles.

[0047] In other embodiments, the second module 21 may also have an annular limiting protrusion 25 on the side near the first module 11. The end of the annular limiting protrusion 25 away from the second module 21 abuts against the external magnetic tile. The limiting protrusion 25 is provided with a gap for the flow of molten material, and the gap is located at the end of the limiting protrusion 25 away from the second module 21.

[0048] Specifically, the production mold also includes a base 3, with the lower mold assembly 1 fixedly mounted on the base 3. The upper mold assembly 2 is driven by an external drive component to move closer to or further away from the lower mold assembly 1, so that the first cavity 12 and the second cavity 22 cooperate to form a closed injection molding cavity, thereby realizing the injection molding of the magnetic tile assembly. The lower mold assembly 1 is installed and supported by the base 3, and the upper mold assembly 2 is driven by an external drive component to perform mold opening and closing movements, which can achieve a stable fit between the first cavity 12 and the second cavity 22, meeting the needs of continuous injection molding production of magnetic tile assemblies.

[0049] Specifically, the base 3 is provided with a demolding assembly, which includes a plate 31 and an ejector pin 32 provided on the plate 31. The end of the ejector pin 32 is driven to extend into the first cavity 12 to eject the molded product. The ejector pin 32 can eject the molded product from the first cavity 12 after the mold is opened, thereby reducing the risk of product surface damage and improving demolding efficiency.

[0050] There are two lower mold components 1 and two bases 3. The two lower mold components 1 are fixedly mounted on the corresponding bases 3. The two bases 3 are installed in the circumferential position of the turntable and maintain a preset distance from the rotation center of the turntable. The turntable is driven to rotate by an external drive mechanism. There is one upper mold component 2, which is located at the working position of one of the lower mold components 1.

[0051] In use, one lower mold assembly 1 is located at the working station and cooperates with the upper mold assembly 2 to complete the mold closing and injection molding. The other lower mold assembly 1 is located at the loading and unloading station. The molded product is ejected by an external drive component and a demolding component, and a new magnetic tile is installed by the operator or an automatic feeding mechanism. After the current injection molding process is completed, the drive mechanism drives the turntable to rotate, causing the two lower mold assemblies 1 to exchange positions. The lower mold assembly 1 at the original loading and unloading station enters the working station for the next injection molding cycle, while the lower mold assembly 1 at the original working station moves to the loading and unloading station for demolding and reloading. This allows the injection molding process to be carried out simultaneously with the demolding and loading processes, improving production cycle and equipment utilization, and reducing equipment waiting time.

[0052] The above descriptions provide one or more embodiments in conjunction with specific details, but do not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A mold for injection molding motor magnets, comprising a lower mold assembly (1) and an upper mold assembly (2); characterized in that: The lower mold assembly (1) includes a first mold (11) and a first cavity (12) disposed on the first mold (11). The upper mold assembly (2) includes a second mold (21) for use with the first mold (11). The second mold (21) has a second cavity (22) on the side near the first mold (11). The second cavity (22) is recessed from the second mold (21) and communicates with the first cavity (12).

2. The injection molding die for producing motor magnets according to claim 1, characterized in that: The first cavity (12) and the second cavity (22) are both opened in a ring. The second mold (21) is provided with several pouring ports (24). The pouring ports (24) are connected to the second cavity (22) and are used to inject molten material into the cavity through external injection molding equipment. The several pouring ports (24) are arranged in a ring array along the second cavity (22).

3. The injection molding die for producing motor magnets according to claim 1, characterized in that: The radial opening dimension of the second cavity (22) is smaller than that of the first cavity (12), the inner ring wall diameter of the second cavity (22) is larger than that of the inner ring wall diameter of the first cavity (12), and the outer ring wall diameter of the second cavity (22) is smaller than that of the outer ring wall diameter of the first cavity (12), so as to form an annular protrusion structure on the top of the injection molded part.

4. The injection molding die for producing motor magnet tiles according to claim 2, characterized in that: The second module (21) is provided with a first limiting member (211) and a second limiting member (212). The first limiting member (211) is located in the inner space formed by the annular second cavity (22), and the second limiting member (212) is located on the outer side of the second cavity (22). The first limiting member (211) and the second limiting member (212) protrude from the second module (21) toward the side close to the first module (11). The first module (11) is provided with corresponding cavity grooves for accommodating the first limiting member (211) and the second limiting member (212).

5. A motor magnet injection molding die according to any one of claims 1-4, characterized in that: The second module (21) is provided with a number of first rods (23), and the number of first rods (23) are arranged in a ring array along the second cavity (22); the first module (11) is provided with second rods (13) for use with the first rods (23), and the number of second rods (13) are located in the first cavity (12) and on the side close to the outer ring wall of the first cavity (12). The number of second rods (13) are arranged in a ring array along the first cavity (12), and there is a gap between two adjacent second rods (13) for accommodating external magnetic tiles.

6. The injection molding die for producing motor magnet tiles according to claim 1, characterized in that: The first module (11) is provided with a third cavity (14). The first cavity (12) is opened in a ring shape. The third cavity (14) is formed by recessing from the outer ring wall of the first cavity (12). The third cavity (14) is opened along the length direction of the first cavity (12) and is connected to the first cavity (12). The third cavity (14) is used to accommodate and limit one end of the external magnetic tile in the thickness direction.

7. The injection molding die for producing motor magnets according to claim 6, characterized in that: The first module (11) is provided with a groove (15), the first cavity (12) is opened in an annular shape, the groove (15) is cut from the inner ring wall of the first cavity (12), the groove (15) is cut along the length direction of the first cavity (12) and is connected to the first cavity (12), the groove (15) is used to cooperate with the third cavity (14) to accommodate and limit the two ends of the outer magnetic tile in the thickness direction.

8. The injection molding die for producing motor magnets according to claim 1, characterized in that: The production mold also includes a base (3), a lower mold assembly (1) fixed on the base (3), and an upper mold assembly (2) driven by an external drive to move closer to or further away from the lower mold assembly (1), so that the first cavity (12) and the second cavity (22) cooperate to form a closed injection cavity, so as to realize the injection molding of the magnetic tile assembly.

9. The injection molding die for producing motor magnet tiles according to claim 8, characterized in that: The base (3) is provided with a demolding assembly, which includes a plate (31) and an ejector pin (32) on the plate (31). The end of the ejector pin (32) is driven to extend into the first cavity (12) to eject the molded product.

10. A method for injection molding production of motor magnets, characterized in that, Includes the following steps: S1. Place several magnetic tiles inside the first cavity (12); S2. Drive the upper mold assembly (2) to approach the lower mold assembly (1), so that the second mold (21) and the first mold (11) cooperate to close the mold, and the second cavity (22) and the first cavity (12) together form an injection cavity for covering the magnetic tile; S3. Molten material is injected into the injection cavity through the pouring port (24) so ​​that the molten material covers the magnetic tile and fills the first cavity (12) and the second cavity (22). S4. The second cavity (22) is used to form an annular protrusion structure on the top of the injection molded part, and the inner and outer ring walls of the injection molded part are lowered to form the mold parting line; S5. After the molten material cools and solidifies, drive the upper mold assembly (2) to open and eject the solidified product through the ejector pin (32).

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