Annular injection mold for rubber coating of bearing and injection molding part
By adopting an annular uniformly distributed injection port design in the bearing rubber ring injection mold, multi-point synchronous injection molding is achieved, solving the problem of broken mark interface in the polymer material fusion area and improving the quality and durability of the bearing rubber.
Patent Information
- Application Number
- CN202421966249.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-08-14
AI Technical Summary
During the bearing wrap ring injection molding process, the polymer material fusion area is prone to form a broken interface, resulting in stress concentration when the bearing is running at high frequency and high speed, affecting stability and durability.
The injection port design with annular uniform distribution is adopted. Through multi-point synchronous injection molding, it ensures that the polymer material is evenly filled into the product forming chamber to avoid uneven flow and fine break marks at the convergence point.
Improves the surface finish and consistency of the internal structure of the injection molded product, and enhances the durability and service life of the product.
Smart Images
Figure CN223186878U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molds, in particular to a bearing rubber-coated annular injection mold and an injection molded part. Background Art
[0002] Bearing overmolding is a unique manufacturing process that combines injection molding technology with the structural characteristics of bearings. A polymer material is injected into a mold using an injection molding machine to form an annular bearing with an overmolded layer. During the overmolding process, the polymer material is injected into the mold as a fluid from the gate, then smoothly extends along opposite paths, ultimately converging and merging at the other end of the mold. However, during this fusion process, the arrangement and bonding of the polymer chains fail to achieve perfect continuity in certain areas, resulting in subtle fractures and interfaces.
[0003] In large annular injection-molded products in other fields, the impact of this fracture interface is minimal. However, the bearings mentioned above are small, precision parts widely used in the structure of automotive automatic doors. Over time, especially when the bearings are subjected to the harsh conditions of high-frequency, high-speed operation of automotive automatic doors, these fractures gradually become weak points where stress concentration occurs. With long-term use, due to uneven stress, the polymer coating in the fracture area begins to show performance differences, resulting in subtle changes in the roundness of the annular coating of the bearing, which in turn affects the overall stability and balance. When the automatic door is opened, the high-speed rotation of the bearing exacerbates this imbalance, causing violent vibration and accompanied by discordant noises, which significantly reduces passenger comfort and the durability of vehicle components.
[0004] Therefore, how to ensure the continuity and uniformity of polymer materials during the fusion process during the annular injection molding of bearing encapsulation is the key to improving the quality of bearing encapsulation. Utility Model Content
[0005] The purpose of the utility model is to provide a bearing rubber-coated annular injection mold and an injection molded part to solve the problem that a fracture interface is formed in the fusion area of the polymer material under the existing annular bearing rubber-coated injection molding method.
[0006] In the first aspect, the utility model provides a bearing rubber-coated annular injection mold, comprising: a fixed mold plate and a movable mold plate, the bottom end of the fixed mold plate is connected to the top end of the movable mold plate, a gate is provided in the fixed mold plate, and a movable mold round rod and a fixed mold insert round rod located on the top of the movable mold round rod are provided in the movable mold plate; the fixed mold plate and the movable mold plate form an annular product molding chamber on the outside of the movable mold round rod; the gate is located above the product molding chamber, and the bottom of the gate has a glue injection port evenly distributed in a ring shape, and the glue injection port is used to allow the injection material in the gate to be filled into the product molding chamber from top to bottom through multi-point injection molding.
[0007] Furthermore, the gate is located in the central area above the product molding chamber, and a cap molding chamber is provided at the bottom of the gate. The cap molding chamber is circular, and the bottom outer edge of the cap molding chamber is connected to the top inner edge of the product molding chamber, and the glue injection port at the bottom of the gate is connected to the top of the central area of the cap molding chamber.
[0008] Furthermore, the gate is annular, and the glue injection port at the bottom of the gate is coaxial with the product molding chamber and connected to the top of the product molding chamber, and the glue is injected in an annular manner through a hot runner.
[0009] Furthermore, the multiple glue injection ports at the bottom of the gate are evenly distributed in a ring shape around the central axis of the product molding chamber and are connected to the top of the product molding chamber. The number of the glue injection ports is greater than four.
[0010] Furthermore, the bearing rubber-coated annular injection mold also includes: a fixed mold taking-up plate, a stripper plate, a pad, a spacer plate, a movable mold taking-up plate and a protective sleeve; the bottom end of the fixed mold taking-up plate is fixedly connected to the stripper plate, the inside of the stripper plate is fixedly connected to the protective sleeve, the bottom end of the stripper plate is fixedly connected to the top of the fixed mold plate, the bottom end of the movable mold plate is fixedly connected to the top of the pad, the bottom end of the pad is fixedly connected to the top of the spacer, and the bottom end of the spacer is fixedly connected to the top of the movable mold taking-up plate.
[0011] In a second aspect, the utility model provides a bearing rubber-coated annular injection molded part produced by the above-mentioned bearing rubber-coated annular injection mold.
[0012] The present invention has the following beneficial effects: The bearing encapsulated annular injection mold and injection molded parts of the present invention adopt an annular evenly distributed injection port design at the bottom of the gate, and through multi-point synchronous injection molding, it ensures that the polymer material can be evenly and smoothly filled from top to bottom to every corner of the product molding chamber. Compared with the traditional single-point injection molding method, the present invention effectively prevents the uneven flow and fine fractures at the convergence point that may be caused by the single path when the material flows in the mold. Multi-point injection molding promotes the wide and uniform distribution of materials, reduces the accumulation of internal stress, and thus improves the surface finish of the product and the consistency of the internal structure, which not only improves the overall quality of the injection molded product, but also enhances the durability and service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0014] Figure 1This is a structural diagram of the first embodiment of the rubber-coated annular injection mold for a bearing provided by the utility model;
[0015] Figure 2 for Figure 1 A partial enlarged view of
[0016] Figure 3 This is a structural diagram of the second embodiment of the rubber-coated annular injection mold for a bearing provided by the utility model;
[0017] Figure 4 for Figure 3 A partial enlarged view of
[0018] Figure 5 Schematic diagram of the third embodiment of the bearing encapsulated annular injection mold provided by the present invention, wherein (a) is a schematic diagram of the first multi-point gluing method, (b) is a schematic diagram of the second multi-point gluing method, and (c) is a schematic diagram of the third multi-point gluing method;
[0019] Figure 6 This is a schematic diagram of the bearing encapsulated annular injection molded part of the present invention.
[0020] Illustration: 1-Fixed mold removal plate; 2-Stripper plate; 3-Fixed mold plate; 4-Moving mold plate; 5-Backing plate; 6-Spacer; 7-Moving mold removal plate; 8-Protective cover; 9-Cap molding chamber; 10-Product molding chamber; 11-Fixed mold insert round rod; 12-Moving mold round rod; 13-Gate; 100-Bearing rubber-coated annular injection molded part. DETAILED DESCRIPTION
[0021] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.
[0022] Example 1
[0023] See also Figure 1 and Figure 2, this embodiment provides a bearing rubber-coated annular injection mold, including: a fixed mold taking plate 1, a stripper plate 2, a fixed mold plate 3, a movable mold plate 4, a pad 5, a spacer plate 6, a movable mold taking plate 7 and a protective sleeve 8; the bottom end of the fixed mold plate 3 is connected to the top of the movable mold plate 4, the bottom end of the fixed mold taking plate 1 is fixedly connected with the stripper plate 2, the inside of the stripper plate 2 is fixedly connected with the protective sleeve 8, the bottom end of the stripper plate 2 is fixedly connected to the top of the fixed mold plate 3, the bottom end of the movable mold plate 4 is fixedly connected to the top of the pad 5, the bottom end of the pad 5 is fixedly connected to the top of the spacer plate 6, and the bottom end of the spacer plate 6 is fixedly connected to the top of the movable mold taking plate 7. A gate 13 is provided within the fixed mold plate 3, and a movable mold rod 12 and a fixed mold insert rod 11 located on top of the movable mold rod 12 are provided within the movable mold plate 4. The fixed mold plate 3 and the movable mold plate 4 form an annular product molding chamber 10 outside the movable mold rod 12. The gate 13 is located above the product molding chamber 10, and the bottom of the gate 13 has injection ports evenly distributed in an annular pattern. The injection ports are used to allow the injection material in the gate 13 to be filled into the product molding chamber 10 from top to bottom through multi-point injection molding. The gate 13 is located in the center area above the product molding chamber 10. The bottom of the gate 13 is provided with a cap molding chamber 9. The cap molding chamber 9 is circular, and the bottom outer edge of the cap molding chamber 9 is connected to the top inner edge of the product molding chamber 10. The injection port at the bottom of the gate 13 is connected to the top of the center area of the cap molding chamber 9.
[0024] This embodiment is designed to design a gate 13 located in the central area above the product molding chamber 10, and its bottom not only integrates the injection ports that are evenly distributed in an annular shape, but also has a circular cap molding chamber 9. The outer edge of the bottom of the cap molding chamber 9 is connected to the inner edge of the top of the product molding chamber 10, and the injection port at the bottom of the gate 13 is directly aligned with the top of the central area of the cap molding chamber 9, realizing a precise and efficient injection molding process. During the injection molding process, the cap molding chamber 9 is first preliminarily injected through the injection port to form the cap part at the top of the product. Subsequently, the injection material is uniformly filled into the product molding chamber 10 from top to bottom through the injection ports that are evenly distributed in an annular shape in a multi-point injection molding manner. This top-down, multi-point synchronous injection molding method effectively solves the problems of a single material flow path, uneven flow, and fine fractures at the convergence point in traditional single-point injection molding. After the product is injection-molded in the product molding chamber 10, the cap part at the top of the product needs to be removed by turning or other processes. This embodiment optimizes the injection inlet layout to promote the uniform distribution and orderly flow of the injection material in the mold, which not only improves the stability and controllability of the injection molding process, but also significantly improves the surface quality and internal structure uniformity of the product.
[0025] Example 2
[0026] See also Figure 3 and Figure 4, this embodiment provides a bearing rubber-coated annular injection mold, including: a fixed mold taking plate 1, a stripper plate 2, a fixed mold plate 3, a movable mold plate 4, a pad 5, a spacer plate 6, a movable mold taking plate 7 and a protective sleeve 8; the bottom end of the fixed mold plate 3 is connected to the top of the movable mold plate 4, the bottom end of the fixed mold taking plate 1 is fixedly connected with the stripper plate 2, the inside of the stripper plate 2 is fixedly connected with the protective sleeve 8, the bottom end of the stripper plate 2 is fixedly connected to the top of the fixed mold plate 3, the bottom end of the movable mold plate 4 is fixedly connected to the top of the pad 5, the bottom end of the pad 5 is fixedly connected to the top of the spacer plate 6, and the bottom end of the spacer plate 6 is fixedly connected to the top of the movable mold taking plate 7. A gate 13 is provided within the fixed mold plate 3, and a movable mold rod 12 and a fixed mold insert rod 11 located on top of the movable mold rod 12 are provided within the movable mold plate 4. The fixed mold plate 3 and the movable mold plate 4 form an annular product molding chamber 10 outside the movable mold rod 12. The gate 13 is located above the product molding chamber 10, and the bottom of the gate 13 has injection ports evenly distributed in an annular pattern. The injection ports are used to fill the injection material in the gate 13 into the product molding chamber 10 from top to bottom through multi-point injection molding. The gate 13 is annular, and the injection port at the bottom of the gate 13 is coaxial with the product molding chamber 10 and connected to the top of the product molding chamber 10, allowing the glue to be fed in an annular manner through a hot runner.
[0027] In this embodiment, the gate 13 is located above the product molding chamber 10 and is an annular structure with an annular glue injection port at its bottom. These glue injection ports are coaxially arranged with the product molding chamber 10 and directly connected to its top, forming an efficient and uniform injection channel network. During the injection molding process, the injection material is filled into the product molding chamber 10 from top to bottom in a multi-point injection molding manner through the annular cylindrical glue injection port in the gate 13. This multi-point, synchronous injection molding method completely abandons the limitations of traditional single-point injection molding and effectively solves the problems of uneven flow and fine fractures at the convergence point caused by the single material flow path. It not only promotes the extensive and uniform distribution of the injection molding material in the mold, but also significantly improves the surface finish and internal structure consistency of the injection molded product.
[0028] Example 3
[0029] See also Figure 4 and Figure 5, this embodiment provides a bearing rubber-coated annular injection mold, including: a fixed mold taking plate 1, a stripper plate 2, a fixed mold plate 3, a movable mold plate 4, a pad 5, a spacer plate 6, a movable mold taking plate 7 and a protective sleeve 8; the bottom end of the fixed mold plate 3 is connected to the top of the movable mold plate 4, the bottom end of the fixed mold taking plate 1 is fixedly connected with the stripper plate 2, the inside of the stripper plate 2 is fixedly connected with the protective sleeve 8, the bottom end of the stripper plate 2 is fixedly connected to the top of the fixed mold plate 3, the bottom end of the movable mold plate 4 is fixedly connected to the top of the pad 5, the bottom end of the pad 5 is fixedly connected to the top of the spacer plate 6, and the bottom end of the spacer plate 6 is fixedly connected to the top of the movable mold taking plate 7. The fixed mold plate 3 is provided with a gate 13, and the movable mold plate 4 is provided with a movable mold rod 12 and a fixed mold insert rod 11 located on top of the movable mold rod 12. The fixed mold plate 3 and the movable mold plate 4 form an annular product molding chamber 10 outside the movable mold rod 12. The above structure is the same as that of the second embodiment. This embodiment uses multi-point glue injection. Specifically, there are three methods.
[0030] like Figure 5 As shown in (a), in the first method, the gate is located above the product molding chamber, and the bottom of the gate has injection ports evenly distributed in a circular shape. The injection ports are used to allow the injection material in the gate to be filled from top to bottom into the product molding chamber through multi-point injection molding. The multiple injection ports at the bottom of the gate are evenly distributed in a circular shape around the central axis of the product molding chamber and connected to the top of the product molding chamber. The number of injection ports is greater than four, and in this embodiment, there are six injection ports. The gate is set above the product molding chamber, and its bottom is evenly distributed around the central axis of the product molding chamber, with a series of injection ports evenly distributed in a circular shape. These injection ports are not only closely connected to the top of the product molding chamber, but also constitute the key channel for multi-point injection molding. During the injection molding process, the injection material is filled from bottom to top into the product molding chamber through these evenly distributed injection ports in a multi-point, synchronous manner. This multi-point injection molding method completely subverts the traditional single-point injection molding model and effectively solves the problems of uneven flow and fine fractures at the convergence point that may be caused by the single flow path of the material in the mold. By injecting multiple points simultaneously, the injection material can be spread more evenly in the mold, reducing the concentration of internal stress, thereby improving the overall quality and surface finish of the product.
[0031] like Figure 5 As shown in (b), the second method uses a main channel located in the center of the molding chamber and multiple branch channels connected to the bottom of the main channel for injection. The injection material is divided from the main channel to each branch channel, achieving multi-point injection. The branch channels are shaped like an inverted figure eight, achieving inverted figure eight injection.
[0032] like Figure 5In the third method, shown in (c), a main channel located in the center of the molding chamber is connected to multiple branch channels at the bottom of the main channel for injection. The injection material is then diverted from the main channel to the various branch channels, achieving multi-point injection. The branch channels are shaped like a figure eight, enabling figure eight injection.
[0033] See also Figure 6 The embodiment of the present invention also provides a bearing rubber-coated annular injection molded part 100, which is manufactured using the bearing rubber-coated annular injection molding method described above. The bearing rubber-coated annular injection molded part eliminates the problems of uneven flow and fine fractures at the convergence point caused by the single flow path of the material in the mold during traditional single-point injection molding, and significantly improves the surface finish and internal structure consistency of the injection molded product.
[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0035] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can, for example, be implemented in an order other than that illustrated or described herein.
[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A bearing encapsulated annular injection mold, characterized in that: include: A fixed mold plate (3) and a movable mold plate (4), wherein the bottom end of the fixed mold plate (3) is connected to the top end of the movable mold plate (4), a gate (13) is provided in the fixed mold plate (3), and a movable mold round rod (12) and a fixed mold insert round rod (11) located on the top of the movable mold round rod (12) are provided in the movable mold plate (4); the fixed mold plate (3) and the movable mold plate (4) form an annular product molding chamber (10) outside the movable mold round rod (12); the gate (13) is located above the product molding chamber (10), and the bottom of the gate (13) has injection ports uniformly distributed in an annular shape, and the injection ports are used to allow the injection material in the gate (13) to be filled into the product molding chamber (10) from top to bottom through multi-point injection molding.
2. A bearing encapsulated annular injection mold according to claim 1, characterized in that: The gate (13) is located in the central area above the product molding chamber (10); a cap molding chamber (9) is provided at the bottom of the gate (13); the cap molding chamber (9) is circular; the bottom outer edge of the cap molding chamber (9) is connected to the top inner edge of the product molding chamber (10); and the glue injection port at the bottom of the gate (13) is connected to the upper center area of the cap molding chamber (9).
3. The bearing encapsulated annular injection mold according to claim 1, characterized in that: The gate (13) is annular, and the glue injection port at the bottom of the gate (13) is coaxial with the product molding chamber (10) and communicated with the top of the product molding chamber (10), and the glue is injected in an annular manner through a hot runner.
4. The bearing encapsulated annular injection mold according to claim 1, characterized in that: The multiple glue injection ports at the bottom of the gate (13) are evenly distributed in a ring shape around the central axis of the product molding chamber (10) and are connected to the top of the product molding chamber (10). The number of the glue injection ports is greater than four.
5. The bearing encapsulated annular injection mold according to claim 1, characterized in that: Also includes: A fixed die taking plate (1), a stripping plate (2), a pad (5), a spacer (6), a movable die taking plate (7) and a protective cover (8); the bottom end of the fixed die taking plate (1) is fixedly connected to the stripping plate (2), the interior of the stripping plate (2) is fixedly connected to the protective cover (8), the bottom end of the stripping plate (2) is fixedly connected to the top end of the fixed die plate (3), the bottom end of the movable die plate (4) is fixedly connected to the top end of the pad (5), the bottom end of the pad (5) is fixedly connected to the top end of the spacer (6), and the bottom end of the spacer (6) is fixedly connected to the top end of the movable die taking plate (7).
6. A bearing encapsulated annular injection molded part, characterized in that: The bearing is made by adopting the bearing rubber-coated annular injection mold described in any one of claims 1 to 5.