Mold core assembly and stator injection mold
The core mold assembly with a stopper portion separates contact and parting surfaces to prevent flash and damage, enhancing the quality and reliability of DC motor BMC injection molding by avoiding collisions and facilitating component replacement.
Patent Information
- Application Number
- CN202323368909.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-08
Smart Images
Figure CN222201443U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of injection molds, and in particular to a core component and a stator injection mold. Background Art
[0002] The mating surfaces of the movable mold core and the fixed mold core used for the injection molding of the existing DC motor BMC (Bulk Molding Compound) are tapered. The taper and the movable mold core are integrally formed and located on the plane of the parting surface. Since the tapered structure is relatively fragile, it is easy to bump against the tapered structure during the removal and placement of the movable mold core, resulting in unevenness of the tapered structure, which damages the parting surface between the movable mold core and the fixed mold core, and causes flash on the parting surface during injection molding. Flash refers to the thin flake-like excess material left on the plastic product after cooling when the plastic overflows from the mold joint surface and the gap between the inserts during the injection molding process. It often occurs on the parting surface between the movable mold core and the fixed core, the sliding part of the slider, the gap between the inserts, and the gap between the ejector pins, etc., causing the plastic encapsulation material to jam the motor and cause noise and other defects. Utility Model Content
[0003] In order to overcome the problems existing in the related technology, the present application provides a core mold assembly, which sets a stop portion in the sleeve assembly so that the contact surface between the movable core and the sleeve assembly is aligned with the parting surface of the injection mold, thereby avoiding injection flash on the parting surface due to damage to the contact surface.
[0004] A first aspect of the present application provides a mold core assembly, comprising: a movable mold core;
[0005] The insert sleeve assembly is provided with a cavity in the axial direction, and the movable mold core is arranged on the cavity;
[0006] Wherein, a stopper portion is arranged at one end of the insert sleeve assembly facing the movable mold core, and the stopper portion is clamped with the movable mold core; and the maximum diameter of the stopper portion is smaller than the outer circumferential diameter of the insert sleeve assembly.
[0007] When the mold is injected, the molded part to be injected is placed on the movable mold core, and then the movable mold core is placed in the cavity of the insert assembly, so that the end of the movable mold core is engaged with the stopper to form a contact surface. After the injection molding is started, the plastic sealing material seals the bare mold part according to the design pattern of the mold core assembly, and forms a parting surface on the end face of the insert assembly. The stopper has a certain height and its outer diameter is smaller than the outer diameter of the insert assembly, so that the parting surface and the contact surface do not interfere with each other when the movable mold core is taken in and put out, thereby avoiding the movable mold core from hitting the insert assembly to cause damage to the shape of the contact surface, and thus avoiding flash on the stopper parting surface of the injection molded part after injection molding.
[0008] In some embodiments, the insert assembly includes an insert core, the insert core is provided with the mold cavity in the axial direction, and the stop portion is provided at the axial end of the insert core;
[0009] The maximum diameter of the stop portion is smaller than the outer diameter of the insert core.
[0010] The outer diameter of the insert core is larger than the maximum diameter of the stop portion, thereby ensuring that a parting surface is formed on the end surface of the insert core, so that the contact surface and the parting surface do not interfere with each other, effectively ensuring the integrity of the parting surface of the stop of the injection molded part.
[0011] In some embodiments, the insert assembly further comprises a fixed core, which is axially provided with a matching hole, and the insert core is arranged in the matching hole;
[0012] The end surface of the insert core is flush with the end surface of the fixed core.
[0013] The movable mold core is easy to collide with the insert core during the process of taking and placing, which will cause the insert core and the movable mold core to be damaged by collision. By setting a fixed core, the size of the insert core assembly can be reduced, and the number of parts replacement of the core assembly can be reduced.
[0014] In some embodiments, the insert core is detachably connected to the fixed core.
[0015] During the injection molding process, the insert core not only collides with the movable mold core, but also needs to clean the cavity in the insert core assembly to ensure the stability of product quality. Through the detachable connection between the insert core and the fixed core, it is possible to replace and maintain only the insert core.
[0016] In some embodiments, a transition surface is provided at the connection between the outer periphery of the stop portion and the end surface of the insert assembly.
[0017] In the above-mentioned core assembly, after the injection molding of the injection molded part is completed, a right-angle stop is formed at the outer periphery of the stop part and the end face of the sleeve assembly. The right-angle stop is replaced with a chamfer through the transition surface to ensure that when the injection molded part cooperates with other injection molded parts, it can reduce the occurrence of debris due to right-angle collisions, causing defects such as motor jamming, and at the same time reduce the generation of right angles, which can avoid scratches on operators due to the right-angle stop being too sharp.
[0018] In some embodiments, the transition surface is an arc surface, one end of the arc surface is connected to the outer periphery of the stop portion; and the other end of the arc surface is connected to the end surface of the insert assembly.
[0019] In the above-mentioned core component, the outer periphery of the arc surface has no taper angle, has more uniform strength, and can avoid taper angle collision when taking and placing and installing on other adapters.
[0020] In some embodiments, the movable mold core includes a mold core member, a protrusion, and a guide column that are fixedly connected in sequence;
[0021] The outer periphery of the core component is used for sleeve mounting of the part to be injected;
[0022] The insert assembly has a concave cavity matched with the convex part;
[0023] The guide post passes through the concave cavity and is arranged in the cavity;
[0024] The maximum outer diameter of the convex portion is smaller than the outer diameter of the core member.
[0025] That is, in the implementation method of the present application, the core component is used to fix the part to be injected, ensuring that the part to be injected can be injected in the core assembly; one end of the core component connected to the convex part is snapped into the stop part to form a contact surface, and the convex part is used to be nested in the insert assembly, thereby ensuring the firmness of the movable core.
[0026] In some embodiments, the cross section of the protrusion is an isosceles trapezoid, and the protrusion has a first end and a second end opposite to each other, the first end is connected to the core member, and the diameter of the first end is larger than that of the second end.
[0027] That is, in the implementation of the present application, the convex portion is sleeved in the concave cavity of the insert assembly to ensure that the position of the core component can be fixed, thereby ensuring the stability of the injection molding.
[0028] In some embodiments, the outer diameter of the core member is equal to the outer diameter of the stop portion.
[0029] That is, in the implementation of the present application, the outer diameter of the core component is the same as the outer diameter of the stop portion, which ensures the flatness of the contact surface and reduces the external structure of the contact surface that is bumped during the placement and pick-up process.
[0030] A second aspect of the present application provides a stator injection mold, comprising:
[0031] upper mold;
[0032] A lower mold, wherein the upper mold and the lower mold are engaged with each other to form a mold cavity;
[0033] The core is the core assembly mentioned above, and the core is arranged in the mold cavity.
[0034] In the above-mentioned stator injection mold, the fixed core in the core assembly is placed on the lower mold, and the sleeve core is sleeved on the fixed core. During injection molding, the movable core sleeved with the stator core is placed in the sleeve core, the injection molding is started, the upper mold covers the lower mold, and the plastic sealing material is heated and filled in the mold cavity, thereby forming an injection molded stator.
[0035] The technical solution provided by this application may have the following beneficial effects:
[0036] The present application provides a core mold assembly, including a movable core mold and a sleeve assembly, wherein a stopper portion provided on the sleeve assembly is engaged with the movable core mold to form a contact surface; the outer diameter of the stopper portion is smaller than the outer diameter of the sleeve assembly, so that a parting surface of the injection mold is formed on the end surface of the sleeve assembly. By providing the stopper portion, the contact surface and the parting surface are separated into two planes, and the contact surface and the parting surface do not interfere with each other. Damage to the contact surface will not affect the injection molding of the parting surface during the injection molding of the plastic encapsulation material. At the same time, in the process of taking and placing the movable core mold, the contact surface will not bump against the parting surface, effectively avoiding the occurrence of flash on the stopper parting surface of the injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.
[0038] Figure 1 It is a structural schematic diagram of an existing mold core assembly shown in an embodiment of the present application;
[0039] Figure 2 It is a structural schematic diagram of a core assembly shown in an embodiment of the present application;
[0040] Figure 3 is an exploded schematic diagram of a core assembly shown in an embodiment of the present application;
[0041] Figure 4 This application example shows Figure 3 A is a partial enlarged schematic diagram;
[0042] Figure 5 It is a structural schematic diagram of the insert sleeve assembly shown in the embodiment of the present application;
[0043] Figure 6 is a cross-sectional view of a core assembly shown in an embodiment of the present application;
[0044] Figure 7 This is the structural intention of the movable mold core shown in the embodiment of the present application.
[0045] 1. movable mold core; 10. contact surface; 11. mold core member; 12. convex part; 13. guide column;
[0046] 2. Insert assembly; 20. Stop portion; 200. Parting surface; 201. Transition surface; 21. Insert core; 22. Fixed core. DETAILED DESCRIPTION
[0047] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0048] The mating surfaces of the movable mold core and the fixed mold core used for the injection molding of the existing DC motor BMC (Bulk Molding Compound) are taper-matched, such as Figure 1 As shown in the figure, in this structure, the taper and the movable mold core are integrally formed and located on the plane of the parting surface. Since the taper structure is relatively fragile, it is easy to bump against the taper structure during the process of taking and placing the movable mold core, resulting in unevenness of the taper structure, which damages the parting surface of the movable mold core and the fixed mold core, and causes flash on the parting surface during injection molding, causing the plastic sealing material to jam the motor and produce noise.
[0049] In response to the above problems, an embodiment of the present application provides a core mold assembly that can separate the contact surface and the parting surface between the movable core mold and the insert sleeve assembly through a stop portion, thereby avoiding injection flash on the parting surface due to damage to the contact surface.
[0050] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.
[0051] Example 1
[0052] See also Figure 2 , a core component provided in an embodiment of the present application includes:
[0053] The insert assembly 2 is provided with a cavity in the axial direction, and the movable mold core 1 is arranged on the cavity;
[0054] The end of the insert assembly 2 facing the movable mold core 1 is provided with a stopper portion 20 , and the stopper portion 20 is engaged with the movable mold core 1 ; the maximum diameter of the stopper portion 20 is smaller than the outer diameter of the insert assembly 2 .
[0055] The core component in the present application is provided with a stopper portion 20 in the inserting assembly 2. When the movable core 1 is placed in the cavity of the inserting assembly 2, the movable core 1 is engaged with the stopper portion 20 to form a contact surface 10, which is the surface where the movable core 1 contacts the inserting assembly 2. A parting surface 200 is formed on the end surface of the inserting assembly 2 to separate the contact surface 10 between the movable core 1 and the inserting assembly 2 from the parting surface 200 after the injection mold is formed, so that the contact surface 10 and the parting surface 200 do not interfere with each other. In the actual injection molding process, since the movable core 1 needs to be manually operated, it is inevitable to avoid collision. Therefore, by setting the contact surface 10 and the parting surface 200 to be separated, the collision damage of the contact surface 10 cannot affect the parting surface 200, thereby reducing the flash (such as, thin sheet-like excess) on the stopper surface of the injection molded part, and improving the injection molding manufacturing quality level.
[0056] Specifically, the movable mold core 1 is arranged on the mold cavity, so that the movable mold core 1 is fixed in the insert assembly 2 during injection molding, ensuring that the position of the injection-molded part does not loosen, and the movable mold core 1 is clamped with the stop portion 20, so that the insert assembly 2 and the movable mold core 1 are tightly matched, and during injection molding, the plastic encapsulation material can be formed in the designed space.
[0057] In this embodiment, the shapes of the movable mold core 1 and the insert sleeve assembly 2 can be adjusted according to actual needs. For example, when the mold core assembly of the embodiment of the present application is used for a plastic-encapsulated motor, the overall shape of the movable mold core 1 can be cylindrical, which is convenient for the stator core to be sleeved on the movable mold core 1 to achieve injection molding of the stator. The stopper portion 20 is provided to eliminate the flash of the stopper parting surface of the injection-molded stator, thereby avoiding the problem of the motor being stuck due to debris from the flash when the injection-molded stator and the rotor are assembled.
[0058] The core mold assembly in this embodiment separates the contact surface 10 and the parting surface 200 through the stop portion 20, so that the damage to the contact surface 10 cannot affect the parting surface 200, and the problem of injection molding stop flash caused by the collision between the movable core 1 and the insert assembly 2 is eliminated.
[0059] Example 2
[0060] In actual application, collisions are inevitable during the process of taking and placing the movable mold core 1 and the inserting sleeve component 2. In order to avoid other quality and safety issues caused by the collisions between the movable mold core 1 and the inserting sleeve component 2, the embodiment of the present application is based on the embodiment 1, and the following structure is designed to ensure that the inserting sleeve component 2 can be quickly replaced after a certain period of work, thereby improving the quality level of the injection molded parts. Please refer to Figures 3 to 6 The insert assembly 2 in the embodiment of the present application includes an insert core 21, the insert core 21 is provided with the cavity in the axial direction, and the stopper portion 20 is provided at the axial end of the insert core 21;
[0061] The maximum diameter of the stop portion 20 is smaller than the outer diameter of the insert core 21 .
[0062] By providing the insert core 21, whose outer diameter is larger than the maximum diameter of the stopper 20, it is ensured that the parting surface 200 is formed at the end of the insert core 21 and the contact surface 10 between the stopper 20 and the movable core 1 is not on the same plane.
[0063] In this embodiment, the insert assembly 2 further includes a fixed core 22, which is axially provided with a matching hole, and the insert core 21 is arranged in the matching hole;
[0064] The end surface of the insert core 21 is flush with the end surface of the fixed core 22 .
[0065] In this embodiment, the insert core 21 and the fixed core 22 are detachably connected.
[0066] Specifically, by setting an insert core 21 in the insert assembly 2 and setting a stop portion 20 at the end of the insert core 21, the contact surface 10 is separated from the parting surface 200, thereby eliminating the problem of flash on the injection stop parting surface caused by a defective contact surface 10. By setting a fixed core 22 in the insert assembly 2, and the end face of the fixed core 22 is flush with the end face of the insert core 21, the flatness of the parting surface 200 is ensured.
[0067] In practical applications, after the insert core 21 has been used for a certain number of times or for a certain number of years, the insert core 21 can be replaced and the fixed core 22 can be used to reduce production costs.
[0068] Example 3
[0069] In order to make the parting surface 200 and the outer peripheral surface of the stop portion 20 in Example 1 and Example 2 form a smoother structure, so as to ensure that it is not easy to cut the human body during assembly and that there will be no chipping due to slight bumps during the process of taking and placing, the embodiment of the present application also designs a corresponding structure. On the basis of the above-mentioned embodiments 1 and 2, a transition surface 201 is provided at the connection between the outer periphery of the stop portion 20 and the end face of the insert assembly 2 in the embodiment of the present application.
[0070] In practical applications, after injection molding, a right-angle stop is formed between the end face of the insert assembly 2 and the outer peripheral surface of the stop portion 20 of the injection molded part. The right-angle stop is changed to a chamfer through the transition surface 201, thereby eliminating the right-angle stop and avoiding scratches on the human body caused by the right-angle stop being too sharp. The transition surface 201 is provided on the stop surface of the injection molded part to facilitate the assembly work of the subsequent process.
[0071] In this embodiment, the transition surface 201 is an arc surface, one end of which is connected to the outer periphery of the stop portion 20 ; and the other end of which is connected to the end surface of the insert assembly 2 .
[0072] Specifically, the arc-shaped transition surface 201 has a smooth surface structure. Since there is no taper angle, the problem of plastic peeling due to collision can be avoided during placement and subsequent assembly.
[0073] In the embodiment of the present application, a transition surface 201 is provided between the end surface of the insert core 21 and the outer peripheral surface of the stop portion 20, thereby reducing the generation of right angles at the stop of the injection molded part, reducing safety accidents, and avoiding the situation where the plastic packaging material jams the motor.
[0074] Example 4
[0075] In order to make the movable mold core 1 in the above embodiment have wider adaptability with the insert assembly 2, the embodiment of the present application also designs a corresponding structure. On the basis of the above embodiment, the movable mold core 1 in the embodiment of the present application includes a mold core member 11, a protrusion 12 and a guide column 13 which are fixedly connected in sequence;
[0076] The outer periphery of the core member 11 is used for sleeve mounting of the part to be injected;
[0077] The insert assembly 2 has a concave cavity matched with the convex portion 12;
[0078] The guide post 13 passes through the concave cavity and is disposed in the cavity;
[0079] The maximum outer diameter of the protrusion 12 is smaller than the outer diameter of the core member 11 .
[0080] Specifically, the core component 11 is used to sleeve the injection molded part to be tested. The core component 11 and the injection molded part to be tested are in an adaptive relationship. The shapes of the core component 11 and the injection molded part to be tested are designed according to the needs of use. In the embodiment of the present application, the peripheral structure of the core component 11 can be the same as the hole structure of the injection molded part. Exemplarily, when the core component 11 is a cylinder, the cavity in the injection molded part (that is, the structure sleeved on the core component 11) can be a cylinder.
[0081] When the movable core 1 is used, it is sleeved on the core component 11 of the part to be injection molded (for example, the core component 11 of the stator core), and is fixed in the insert assembly 2 through the protrusion 12 and the guide column 13. The outer diameter of the protrusion 12 is smaller than the outer diameter of the core component 11, so that a corresponding contact surface 10 is formed on the end surface where the protrusion 12 is connected to the core component 11 (that is, the stop portion 20 is clamped with the core component 11).
[0082] In this embodiment, the cross section of the convex portion 12 is an isosceles trapezoid. The convex portion 12 has a first end and a second end opposite to each other. The first end is connected to the core member 11 , and the diameter of the first end is greater than that of the second end.
[0083] Specifically, by providing the convex portion 12 with an isosceles trapezoidal cross section, when it cooperates with the concave cavity in the insert assembly 2, it has higher firmness and improves the injection molding stability.
[0084] In this embodiment, the outer diameter of the core member 11 is equal to the outer diameter of the stop portion 20 .
[0085] Specifically, by designing the outer diameters of the core member 11 and the stop portion 20 to be equal, the uniformity of the outer shape of the injection molded part at the contact surface 10 can be improved.
[0086] The embodiment of the present application provides a core component 11, a protrusion 12 and a guide column 13, so as to improve the firmness of the movable core 1 and the insert assembly 2, enhance the stability during injection molding, and ensure the quality level of injection molding.
[0087] Example 5
[0088] On the basis of the above embodiments, the present application further provides a stator injection mold, specifically comprising:
[0089] upper mold;
[0090] A lower mold, wherein the upper mold and the lower mold are engaged with each other to form a mold cavity;
[0091] The core is the core assembly mentioned above, and the core is arranged in the mold cavity.
[0092] Specifically, a hydraulic press is used to insert the stator core into the core component 11 in the movable core 1 through a die tooling, the movable core 1 is placed in the insert assembly 2, fixed in the insert core 21, and the equipment is started so that the upper mold covers the lower mold, thereby enclosing the core assembly, the core assembly is located in the mold cavity, and the BMC plastic encapsulation material is injected into the mold cavity through the injection molding equipment, thereby completing the stator injection molding, after the movable core 1 is taken out and the injection molded stator is disassembled, the injection molded stator and the injection molded rotor are assembled, thereby completing the assembly of the plastic encapsulated motor. Among them, the inner cavity stop parting surface of the injection molded stator and the transition surface 201 in the parting surface 200 overlap with the stop parting surface of the injection molded rotor, and the transition surface 201 of the chamfered structure cooperates with the injection molded rotor, thereby reducing the right-angle collision between the two during assembly, and ensuring the quality level of the plastic encapsulated motor.
[0093] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A core assembly for an injection mold, characterized in that: include: Movable mold core; The insert sleeve assembly is provided with a cavity in the axial direction, and the movable mold core is arranged on the cavity; Wherein, a stopper portion is arranged at one end of the insert sleeve assembly facing the movable mold core, and the stopper portion is clamped with the movable mold core; and the maximum diameter of the stopper portion is smaller than the outer circumferential diameter of the insert sleeve assembly.
2. The core assembly according to claim 1, characterized in that: The insert assembly comprises an insert core, the insert core is provided with the cavity in the axial direction, and the stop portion is provided at the axial end of the insert core; The maximum diameter of the stop portion is smaller than the outer diameter of the insert core.
3. The core assembly according to claim 2, characterized in that: The insert assembly also includes a fixed core, which is axially provided with a matching hole, and the insert core is arranged in the matching hole; The end surface of the insert core is flush with the end surface of the fixed core.
4. The core assembly according to claim 3, characterized in that: The insert core is detachably connected to the fixed core.
5. The core assembly according to claim 1, characterized in that: A transition surface is provided at the connection between the outer periphery of the stop portion and the end surface of the insert assembly.
6. The core assembly according to claim 5, characterized in that: The transition surface is an arc surface, one end of which is connected to the outer periphery of the stop portion; and the other end of which is connected to the end surface of the insert assembly.
7. The core assembly according to claim 1, characterized in that: The movable mold core comprises a mold core member, a convex portion and a guide column which are fixedly connected in sequence; The outer periphery of the core component is used for sleeve mounting of the part to be injected; The insert assembly has a concave cavity matched with the convex part; The guide column passes through the concave cavity and is arranged in the cavity; The maximum outer diameter of the convex portion is smaller than the outer diameter of the core member.
8. The core assembly according to claim 7, characterized in that: The cross section of the convex portion is an isosceles trapezoid. The convex portion has a first end and a second end opposite to each other. The first end is connected to the core member, and the diameter of the first end is greater than that of the second end.
9. The core assembly according to claim 8, characterized in that: The outer diameter of the core member is equal to the outer diameter of the stop portion.
10. A stator injection mold, characterized in that: include: upper mold; A lower mold, wherein the upper mold and the lower mold are engaged with each other to form a mold cavity; A core, wherein the core comprises a core assembly as described in any one of claims 1 to 9, and the core is arranged in the mold cavity.