Mold for improving joint of silica gel coated with plastic
By improving the mold structure and using raised parts and annular raised structures to prevent silicone from flowing into the bottom of deep holes, the problems of silicone overflow and difficulty in cleaning are solved, and an efficient and low-cost silicone coating effect is achieved.
Patent Information
- Application Number
- CN202422755458.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-12
AI Technical Summary
Existing silicone overmolding molds, when manufacturing plastic products with deep-hole structures, have problems with silicone overflow and difficulty in cleaning, resulting in increased product quality and cost.
An improved mold structure is adopted, including an upper mold part and a lower mold part, which are provided with a glue inlet channel and a protrusion. The end of the protrusion abuts the bottom of the deep hole, the side spacing matches the inner wall, and an annular protrusion structure is provided at the end to prevent silicone from flowing into the bottom of the deep hole.
The precise and uniform molding of the silicone layer around the deep hole is achieved, which improves the product appearance quality and dimensional accuracy, reduces the cleaning workload and lowers the manufacturing cost.
Smart Images
Figure CN223383852U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molds, in particular to a mold for improving the joint of silicone-coated plastics. Background Art
[0002] In the field of silicone-coated plastic products, there is a specific type of plastic product with deep holes and further through-holes machined into the deep holes. When coating these products, the goal is to coat the silicone only to the inner walls of the deep holes, while leaving the bottom of the deep holes and the inner walls of the through-holes free of silicone.
[0003] Traditional silicone overmolding molds face many problems when used in the manufacturing process of such products. After the silicone overmolding process, due to limitations of mold structure and process parameters, some silicone often overflows. Especially in deep hole structures, the through-hole structure will lead to reduced airtightness. During the injection process, the silicone can easily flow to the bottom of the deep hole, which leads to the need to clean the overflowed silicone later. However, the characteristics of the deep hole structure make the cleaning of the silicone extremely difficult. The depth of the deep hole and the relatively narrow space make it difficult for cleaning tools to effectively reach and thoroughly remove the silicone residue. Conventional cleaning methods such as manual wiping and simple mechanical cleaning are not only inefficient, but also difficult to ensure that the silicone at the bottom of the deep hole can be completely cleaned.
[0004] Incomplete silicone cleaning can affect subsequent processing steps, such as assembly accuracy. Furthermore, to achieve optimal product quality, additional manpower, material resources, and time are required to clean the silicone, significantly increasing manufacturing costs. Therefore, existing silicone overmolding molds and related processes are no longer able to meet the requirements for efficient and cost-effective production of these deep-pored plastic products with specialized overmolding requirements. A new process or mold structure is urgently needed to address these issues. Utility Model Content
[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.
[0006] A mold for improving the joint of silicone-coated plastic, used for forming a silicone layer on the surface of a plastic product with a deep-hole structure, comprising an upper mold component and a lower mold component that are docked with each other, at least one mold cavity is formed between the upper mold component and the lower mold component after docking, the upper mold component is provided with a glue inlet channel for docking with the mold cavity, a structure for positioning the plastic product and a raised portion for docking with the deep-hole structure of the plastic product are provided in the mold cavity, the end of the raised portion is arranged to abut against the bottom of the deep-hole structure, the side of the raised portion is arranged to be spaced to match the inner wall of the deep-hole structure, and an annular raised structure is also provided at the end of the raised portion to generate a certain pressing force to press the deep-hole structure at the junction between the inner wall and the bottom.
[0007] Preferably, the annular protrusion structure has an outer annular surface, an inner annular surface and an abutting end surface, the outer annular surface is a vertical surface or an inclined surface, the inner annular surface is an inclined surface, and the inclination of the inner annular surface is greater than the inclination of the outer annular surface, and the abutting end surface is pressed against the bottom of the deep hole structure.
[0008] Preferably, there is a distance between the annular protrusion structure and the end surface edge of the protrusion.
[0009] Preferably, the protrusion is configured as a deep hole structure with a through hole at the docking bottom.
[0010] Preferably, the raised portion is arranged to be a deep hole structure having an annular boss on the edge of the docking hole structure, wherein the raised portion and the annular boss are clearance-fitted, and the inner annular surface of the annular boss structure is press-fitted at the junction of the end and side of the annular boss.
[0011] Preferably, the protrusion is arranged to be connected to a deep hole structure in which a metal ring is provided on the inner wall of the through hole structure.
[0012] Preferably, the protrusion is configured to engage with a deep hole structure whose inner wall is an inclined surface, wherein the side wall of the protrusion is adapted to the inner wall of the deep hole structure in terms of inclination.
[0013] Preferably, four mold cavities are formed between the upper mold part and the lower mold part after being butted together.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] By adopting the annular raised structure, the silicone layer can be precisely and evenly molded on the surface of the plastic product, especially around the deep hole structure. This avoids problems such as uneven silicone coating and silicone flowing into the bottom of the deep hole, thereby improving the overall appearance quality and dimensional accuracy of the product, making the product more consistent with design standards and usage requirements. In addition, because the mold can effectively prevent silicone from flowing into the bottom of the deep hole, the subsequent cleaning workload of the silicone at the bottom of the deep hole is greatly reduced, eliminating the need for a large amount of manpower and time for cleaning work. At the same time, it also avoids the possibility of product scrapping due to incomplete cleaning, thereby reducing the manufacturing cost of the product.
[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0018] Figure 1 This is a schematic diagram of the structure of the utility model in the mold opening state;
[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in the mold closing state;
[0020] Figure 3 This utility model Figure 2 A schematic structural diagram of an implementation method;
[0021] Figure 4 This utility model Figure 2 A schematic diagram of another embodiment of the present invention;
[0022] Figure 5 This utility model Figure 4 Schematic diagram of the structure after removing the upper mold parts;
[0023] Figure 6 This utility model Figure 4 Schematic diagram of the structure at point B.
[0024] The reference numerals and names in the figures are as follows:
[0025] Plastic product 1, silicone layer 2, deep hole structure 3, metal ring 4, upper mold part 10, glue inlet channel 11, lower mold part 20, protrusion 30, annular protrusion structure 31, outer ring surface 32, inner ring surface 33, and abutting end surface 34. DETAILED DESCRIPTION
[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0027] See also Figure 1-6 In an embodiment of the present invention, a mold for improving the joint of silicone-coated plastic is proposed, which is used to form a silicone layer 2 on the surface of a plastic product 1 with a deep hole structure 3, including an upper mold part 10 and a lower mold part 20 that are docked with each other, and can provide a closed and regularly shaped space for the molding of silicone on the surface of the plastic product 1, that is, at least one mold cavity is formed between the upper mold part 10 and the lower mold part 20 after docking, such as Figure 1 As shown, the present technical solution takes the four mold cavities formed between the upper mold part 10 and the lower mold part 20 after docking as an example to describe its specific implementation method; the upper mold part 10 is provided with a glue inlet channel 11 to dock with the mold cavity. The glue inlet channel 11 is a channel for liquid silicone to enter the mold cavity. Its reasonable setting can make the silicone maintain a stable flow rate and pressure during the injection process, and can be evenly and smoothly filled into the mold cavity, avoiding problems such as local glue shortage or silicone accumulation caused by uneven silicone flow, thereby ensuring the integrity and uniformity of the silicone layer 2 formed on the surface of the plastic product 1.
[0028] The mold cavity is equipped with a structure for positioning the plastic product 1 and a protrusion 30 for docking with the deep hole structure 3 of the plastic product 1. The protrusion 30 is primarily designed to fit within the deep hole structure 3 of the plastic product 1. By inserting into the deep hole structure 3, it can limit and guide the formation of silicone rubber in the area surrounding the deep hole, allowing the silicone rubber to form a predetermined shape and thickness around the deep hole, preventing excessive silicone from flowing into the deep hole and causing unnecessary cleaning work.
[0029] The end of the raised portion 30 is configured to abut the bottom of the deep hole structure 3, while the side portions of the raised portion 30 are spaced to match the inner wall of the deep hole structure 3. This contact between the end and the bottom provides support and positioning for the deep hole structure 3 from the bottom, preventing deformation of the deep hole under the pressure of silicone injection. The spacing between the side portions and the inner wall ensures that the silicone does not hinder the normal flow of silicone to fill the area surrounding the deep hole, while also defining the flow range of the silicone, allowing the silicone to be properly coated around the deep hole. Furthermore, an annular raised structure 31 is provided at the end of the raised portion 30 to generate a certain compressive force to press against the deep hole structure 3 at the junction between the inner wall and the bottom. The annular raised structure 31 generates a compressive force at the junction between the inner wall and the bottom of the deep hole, primarily to further restrict the flow of silicone. This critical junction creates a sealing effect, effectively preventing silicone from flowing into the deep hole bottom, ensuring that the deep hole bottom and the inner wall of the through-hole are not coated with silicone as required, reducing subsequent cleaning work and related costs.
[0030] Therefore, by adopting the provision of the annular raised structure 31, the silicone layer 2 can be precisely and evenly formed on the surface of the plastic product 1, especially around the deep hole structure 3, avoiding problems such as uneven silicone coating and silicone flowing into the bottom of the deep hole, thereby improving the overall appearance quality and dimensional accuracy of the product, making the product more consistent with design standards and usage requirements. In addition, because the mold can effectively prevent silicone from flowing into the bottom of the deep hole, the subsequent workload of cleaning the silicone at the bottom of the deep hole is greatly reduced, eliminating the need for a large amount of manpower and time for cleaning work, and also avoiding the possibility of product scrapping due to incomplete cleaning, thereby reducing the manufacturing cost of the product.
[0031] See also Figure 2-6 To ensure a tighter fit between the annular protrusion 31 and the deep hole structure 3 of the plastic product 1, and to allow the silicone layer 2 to be precisely injected into the inner wall of the deep hole without penetrating the bottom of the deep hole, the annular protrusion 31 comprises an outer annular surface 32, an inner annular surface 33, and an abutting end surface 34. The outer annular surface 32 is a vertical or inclined surface, while the inner annular surface 33 is an inclined surface, with the slope of the inner annular surface 33 being greater than that of the outer annular surface 32. The abutting end surface 34 presses against the bottom of the deep hole structure 3. The vertical or inclined configuration of the outer annular surface 32 and the larger slope of the inner annular surface 33 enable the annular protrusion 31 to better adapt to the shape of the deep hole structure 3 when inserted into the deep hole structure 3. The different slopes of the inner and outer annular surfaces 32 also create a "flow-guiding" effect, guiding the silicone to flow along a predetermined path, that is, precisely toward the inner wall of the deep hole, while effectively preventing the silicone from penetrating the bottom of the deep hole. The tight pressing fit between the abutting end surface 34 and the bottom of the deep hole further blocks the passage for the silicone to flow to the bottom of the deep hole, ensuring that the silicone layer 2 can be accurately formed only on the inner wall of the deep hole.
[0032] See also Figure 2-6 There is a distance between the annular protrusion structure 31 and the end face edge of the protrusion 30. The setting of this distance can play a certain transition role, that is, the annular protrusion structure 31 plays a greater role in enhancing the air density of the bottom of the deep hole structure 3. The setting of this distance can not only make the annular protrusion 30 and the bottom of the deep hole structure 3 tightly pressed together, but also ensure that the bottom of the deep hole structure 3 will not be concavely deformed due to excessive pressure, causing silicone to flow into the concave deformed structure.
[0033] The arrangement of the protrusion 30 and the annular protrusion structure 31 enables the mold to be configured to be used for the production of various types of plastic products 1 with deep hole structures 3, with silicone encapsulation to the inner wall of the deep hole.
[0034] Example 1, please refer to Figure 3 and Figure 6 The raised portion 30 is configured to dock with a deep hole structure 3 with a through hole at the bottom. During the silicone encapsulation process on the surface of the plastic product 1 with a through hole structure at the bottom of the deep hole structure 3, the silicone layer 2 can be completely blocked by the annular raised structure 31, and the setting of the through hole structure may not cause the air tightness inside the deep hole structure 3 to decrease and improve the ability of silicone to guide penetration, thereby ensuring more precise positioning of the silicone encapsulation process on the surface of the plastic product 1 with further through holes in this type of deep hole structure 3.
[0035] Example 2, please refer to Figure 3 and Figure 6 On the basis of Example 1, the raised portion 30 is further configured to be connected to a deep hole structure 3 having an annular boss on the edge of the through-hole structure, wherein the raised portion 30 and the annular boss are clearance-fitted, and the inner annular surface 33 of the annular raised structure 31 is pressed against the junction of the end and side of the annular boss. In the setting, the slope of the inner annular surface 33 of the annular raised structure 31 is used to press against the junction of the end and side of the annular boss, so that the annular raised structure 31 can press and seal the bottom of the deep hole structure 3 from the two structures of the abutting end surface 34 and the inner annular surface 33, thereby ensuring that this type of structure can also be set with the same high-precision silicone layer 2.
[0036] Example 3, please refer to Figure 4-6 On the basis of Example 2, the protrusion 30 is further configured to be connected to the deep hole structure 3 of the inner wall of the through-hole structure and provided with a metal ring 4. The metal ring 4 itself has a certain strength. If there is a certain tolerance between the size of the metal ring 4 and the size of the mold during positioning, it will often lead to an increase in airtightness. The introduction of this metal ring 4 on the basis of Example 2 also ensures the precision of the molding of the silicone layer 2 without glue overflow.
[0037] Example 4, please refer to Figure 3-6 The raised portion 30 is configured to dock with a deep hole structure 3 whose inner wall is an inclined surface, wherein the side wall of the raised portion 30 is adapted to the inner wall of the deep hole structure 3 in terms of inclination, that is, the inner wall of the deep hole structure 3 can be a vertical surface or an inclined surface, both of which can be achieved through the annular raised structure 31 adopted in the present technical solution to achieve only the rubber coating of the inner wall of the deep hole structure 3, without allowing the silicone to penetrate into the bottom of the deep hole structure 3.
[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.
Claims
1. A mold for improving the joint of silicone-coated plastic, used for forming a silicone layer (2) on the surface of a plastic product (1) with a deep hole structure (3), characterized in that: The invention comprises an upper mold part (10) and a lower mold part (20) that are docked with each other, wherein at least one mold cavity is formed between the upper mold part (10) and the lower mold part (20) after docking, the upper mold part (10) is provided with a glue inlet channel (11) to dock with the mold cavity, and a structure for positioning and placing a plastic product (1) and a protrusion (30) for docking with a deep hole structure (3) of the plastic product (1) are provided in the mold cavity, the end of the protrusion (30) is arranged to abut against the bottom of the deep hole structure (3), the side of the protrusion (30) is arranged to be spaced to match the inner wall of the deep hole structure (3), and an annular protrusion structure (31) is further provided at the end of the protrusion (30) to generate a certain pressing force to press the deep hole structure (3) at the junction between the inner wall and the bottom.
2. A mold for improving the joint of silicone-coated plastic according to claim 1, characterized in that: The annular protrusion structure (31) comprises an outer annular surface (32), an inner annular surface (33) and an abutting end surface (34); the outer annular surface (32) is a vertical surface or an inclined surface; the inner annular surface (33) is an inclined surface; and the inclination of the inner annular surface (33) is greater than the inclination of the outer annular surface (32); the abutting end surface (34) is press-fitted with the bottom of the deep hole structure (3).
3. The mold for improving the joint of silicone-coated plastic according to claim 1, characterized in that: There is a distance between the annular protrusion structure (31) and the end surface edge of the protrusion (30).
4. The mold for improving the joint of silicone-coated plastic according to claim 2, characterized in that: The raised portion (30) is configured to be connected to a deep hole structure (3) with a through hole at the bottom.
5. A mold for improving the joint of silicone-coated plastic according to claim 4, characterized in that: The raised portion (30) is configured to connect to a deep hole structure (3) having an annular boss at the edge of the through hole structure, wherein the raised portion (30) and the annular boss are clearance-fitted, and the inner annular surface (33) of the annular raised structure (31) is press-fitted at the junction of the end and side of the annular boss.
6. The mold for improving the joint of silicone-coated plastic according to claim 4, characterized in that: The protrusion (30) is arranged to connect with the deep hole structure (3) having a metal ring (4) provided on the inner wall of the through hole structure.
7. The mold for improving the joint of silicone-coated plastic according to claim 1, characterized in that: The protrusion (30) is configured to connect with a deep hole structure (3) whose inner wall is an inclined surface, wherein the side wall of the protrusion (30) is adapted to the inner wall of the deep hole structure (3) in terms of inclination.
8. The mold for improving the joint of silicone-coated plastic according to claim 1, characterized in that: Four mold cavities are formed between the upper mold part (10) and the lower mold part (20) after being butted together.