Crater forming mold core for rear cover of mobile phone

Abstract

The utility model discloses a crater forming mold core for a rear cover of a mobile phone, which relates to the technical field of molds, and comprises an upper mold core and a lower mold core which can be oppositely closed, a base part matched with the rear cover of the mobile phone in shape is convexly arranged on the closing surface of the upper mold core, and at least one forming part is convexly arranged at any corner of the top surface of the base part. At least one edge of the forming part is provided with a fillet, the radius of the fillet is R, the top surface of each forming part is convexly provided with a limiting part for limiting the downward pressing depth of the upper mold core, and the edge of the side wall of each limiting part is perpendicular to the edge of the corresponding forming part. According to the utility model, the pressing depth of the upper mold core can be effectively limited, excessive pressing is avoided, the dimensional accuracy of an R angle at a molded crater is ensured, and the appearance quality of a final product is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a volcano-shaped mold core for mobile phone back cover molding. Background Technology

[0002] With the continuous development of the smartphone market, the design and materials of phone casings have gradually become one of the key considerations in the phone manufacturing process. Fiberglass, due to its excellent mechanical properties, thermal stability, and lightweight characteristics, has been widely used in the manufacture of phone back covers, especially in high-end phones. Fiberglass not only enhances the phone's appearance but also effectively strengthens its durability and pressure resistance. In the design of fiberglass back covers, the crater shape (i.e., the raised area formed on the back cover surface) has gradually become a unique design element. This crater design not only improves the phone's aesthetics but also further enhances its drop resistance and pressure resistance by altering the back cover's structure. Therefore, the crater molding process is being used more and more widely in the production of phone back covers.

[0003] In the traditional molding process of fiberglass back covers for mobile phones, mold making is particularly crucial. Typically, based on the customer's needs, the designer will create a mold that matches the shape requirements of the crater. This traditional molding method is mainly achieved through mechanical pressing or injection molding technology. In mold design, it is necessary to precisely create the concave and convex molds according to the shape of the crater.

[0004] However, when using this molding method, a technical challenge often arises in actual production: the radius (R-angle) of the molded part (i.e., the smoothness of the curve) cannot meet the design requirements. The problem mainly stems from stress concentration during the crater molding process, especially in the crater area where the fiberglass material has high hardness, easily leading to uneven stress distribution during molding. If precise depth control is lacking during mold pressing, the upper mold (punch) often presses down excessively, affecting the part's shape. Particularly in the crater area, this can easily result in undesirable shapes, affecting not only the surface quality of the back cover in the crater area but also potentially its appearance and performance.

[0005] In view of this, the inventor conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Utility Model Content

[0006] This utility model provides a volcano-shaped mold core for mobile phone back cover molding, which aims to solve the problem that the radius angle does not meet the standard due to excessive pressure during the molding process of existing molds.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A volcano-shaped mold core for a mobile phone back cover includes an upper mold core and a lower mold core that can be closed relative to each other. The closing surface of the upper mold core is provided with a base portion that conforms to the shape of the mobile phone back cover. At least one forming portion is provided at any corner of the top surface of the base portion. At least one edge of the forming portion has a rounded corner with a radius of R. The top surface of each forming portion is provided with a limiting portion for limiting the pressing depth of the upper mold core. The sidewall edge of the limiting portion is perpendicular to the edge of the forming portion.

[0009] Furthermore, the mold closing surface of the lower mold core is recessed with a first cavity that corresponds to the position of the base and matches its shape, and the bottom wall of the first cavity is recessed with a second cavity that corresponds to the position of the molding part and matches its shape.

[0010] Furthermore, the fillet radius R of the above-mentioned molded part is 1.2-1.5mm.

[0011] Furthermore, the height of the aforementioned limiting part is 0.08-0.1 mm.

[0012] Furthermore, the aforementioned forming part can be any one of a rectangle, circle, triangle, ellipse or polygon.

[0013] Furthermore, the above-mentioned molding part consists of two circular protrusions arranged at intervals along a straight line, and the top surface of each of the above-mentioned circular protrusions is provided with the above-mentioned limiting part.

[0014] Furthermore, the above-mentioned molding part consists of a plurality of spaced circular protrusions, which are distributed in a triangular pattern, and the top surface of each of the above-mentioned circular protrusions is provided with the above-mentioned limiting part.

[0015] As can be seen from the above description of the structure of this utility model, this utility model has the following advantages:

[0016] This invention effectively limits the downward pressing depth of the upper mold core after the upper and lower mold cores are closed by setting a limiting part perpendicular to the forming part of the upper mold core. This ensures uniform pressure distribution during the mold closing process, avoids over-pressing, ensures the dimensional accuracy of the R-angle at the crater after molding, and significantly improves the appearance quality of the final product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the molding part of this utility model.

[0019] Figure 3 This is a schematic diagram of the stepped section of this utility model.

[0020] Figure 4 for Figure 3Enlarged structural diagram at point A

[0021] Figure 5 This is a schematic diagram of the structure of the first embodiment of the molding part of this utility model.

[0022] Figure 6 This is a schematic diagram of the second embodiment of the molding part of this utility model.

[0023] Reference numerals: 10-Upper mold core; 11-Base; 12-Forming part; 13-Restriction part. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] Reference Figures 1 to 4 A volcano-shaped mold core for a mobile phone back cover includes a lower mold core (not shown) and an upper mold core 10 that can move relative to the lower mold core and close with it. The upper mold core 10 and the lower mold core are respectively used to be embedded in the upper template (not shown) and the lower template (not shown) of the mold. The closing surface of the upper mold core 10 is provided with a base 11 that matches the shape of the mobile phone back cover. At least one forming part 12 is provided at any corner of the top surface of the base 11. The forming part 12 can be any one of rectangle, circle, triangle, ellipse or polygon, and at least one edge of the forming part 12 has a rounded corner with a radius of R. In this embodiment, R is 1.2-1.5mm, preferably 1.2mm. The top surface of each molding part 12 is provided with a limiting part 13 for limiting the pressing depth of the upper mold core. The limiting part 12 has the same shape as the top cross-section of the molding part 12. The height of the limiting part 13 is 0.08-0.1mm, preferably 0.08mm. The side wall edge of the limiting part 13 is perpendicular to the edge of the molding part 12. The mold closing surface of the lower mold core is recessed with a first cavity (not shown in the figure) that matches the shape of the base 11. The bottom wall of the first cavity is recessed with a second cavity (not shown in the figure) that corresponds to the position of the molding part 12.

[0026] Reference Figures 1 to 4 In application, the unformed fiberglass substrate is placed into the first cavity of the lower mold core by a robotic arm or manually. Then, the upper mold plate moves the upper mold core 10 downward to close with the lower mold core. During the mold closing process, the limiting part 13 contacts the second cavity of the lower mold core, thereby limiting the further downward pressure of the upper mold core 10, ensuring the accuracy and uniform pressure during mold closing, and avoiding the problem of substandard R-angle at the crater after molding due to over-pressing.

[0027] Reference Figures 1 to 5In the first embodiment of the molding part 12 of this utility model, the molding part 12 consists of two circular protrusions arranged at intervals along a straight line, and the top surface of each circular protrusion is provided with the aforementioned limiting part 13.

[0028] Reference Figures 1 to 5 In the second embodiment of the molding part 12 of this utility model, the molding part 12 is a plurality of circular protrusions arranged at intervals, the plurality of circular protrusions are distributed in a triangular pattern, and the top surface of each circular protrusion is provided with the aforementioned limiting part 13.

[0029] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A volcano-shaped mold core for a mobile phone back cover, comprising an upper mold core and a lower mold core that can be closed relative to each other, characterized in that: The upper mold core has a base protruding from its mold-closing surface that matches the shape of the phone back cover. At least one forming part is protruding from any corner of the top surface of the base. At least one edge of the forming part has a rounded corner with a radius of R. The top surface of each forming part has a limiting part for limiting the pressing depth of the upper mold core. The sidewall edge of the limiting part is perpendicular to the edge of the forming part.

2. The mobile phone back cover volcano-shaped molding core according to claim 1, characterized in that: The mold core has a first recessed cavity on its mating surface that corresponds to and matches the shape of the base, and the bottom wall of the first recessed cavity has a second recessed cavity that corresponds to and matches the shape of the molding part.

3. The mobile phone back cover volcano-shaped molding core according to claim 1, characterized in that: The fillet radius R of the molded part is 1.2-1.5mm.

4. The mobile phone back cover volcano-shaped molding core according to claim 1, characterized in that: The height of the limiting part is 0.08-0.1 mm.

5. The mobile phone back cover volcano-shaped molding core according to claim 1, characterized in that: The forming part can be any one of a rectangle, circle, triangle, ellipse or polygon.

6. The mobile phone back cover volcano-shaped molding core according to any one of claims 1 to 5, characterized in that: The forming part consists of two circular protrusions spaced apart along a straight line, and the top surface of each circular protrusion is provided with the limiting part.

7. The mobile phone back cover crater molding die according to any one of claims 1 to 5, characterized in that: The forming part consists of multiple spaced circular protrusions arranged in a triangular pattern, and the top surface of each circular protrusion is provided with the limiting part.

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