Mobile phone front shell hardware structure

Abstract

The utility model discloses a mobile phone front shell hardware structure belongs to mobile phone structure design field. This mobile phone front shell hardware structure includes front shell hardware spare and front shell plastic, and the side surface of front shell hardware spare is inwards retracted along the horizontal direction and forms the retraction, and the retraction is completely wrapped by front shell plastic, and the front shell hardware spare only bottom is provided with the seal glue surface that front shell plastic is pasted. The utility model can solve the problem of the high flatness requirement of front shell hardware spare, the high processing cost of pouring gate and the easy overflow glue of the double seal glue surface design of the front shell hardware spare and front shell plastic.

Description

Technical Field

[0001] This utility model relates to the field of mobile phone structural design, and in particular to a hardware structure for the front shell of a mobile phone. Background Technology

[0002] In the field of mobile phone structural design, the front shell, as a crucial component, is typically manufactured by combining front shell metal components with front shell plastic to balance structural strength and lightweight requirements. Currently, in common mobile phone front shell designs, the sealing surfaces between the front shell metal components and the front shell plastic are mostly the sides and bottom. This dual-sealing design presents several problems in actual production. Side sealing requires the use of mold slides, and mold slide sealing demands extremely high flatness on the sides of the front shell metal components. Even minor unevenness on the sides of the front shell metal components, such as burrs of about 0.1mm, can cause molten plastic to overflow from the gap between the sides of the front shell metal components and the mold slides during injection molding, resulting in excess plastic. This severely affects the product's appearance and sealing performance, leading to an increased defect rate.

[0003] Meanwhile, to meet the high flatness requirements of the front shell hardware for side sealing, the gates of the front shell hardware can only be removed one by one using CNC (Computer Numerical Control) milling machines. However, CNC cutting is not only inefficient but also costly, with the gate cutting cost for each mobile phone front shell hardware component often reaching around 0.45 yuan. For mobile phone manufacturers producing on a large scale, this is a considerable expense. In addition, the double-sealing surface design makes the mold structure complex, and the processing and maintenance costs of the mold slides are also high, further increasing the overall production cost of the mobile phone front shell.

[0004] Therefore, the industry urgently needs a new design solution that can balance structural reliability and economy. Utility Model Content

[0005] The purpose of this utility model is to provide a mobile phone front shell hardware structure that solves the problems of high flatness requirements, high gate processing costs, and easy glue overflow caused by the existing mobile phone front shell hardware and front shell plastic double sealing surface design.

[0006] To achieve the above objectives, this utility model provides a mobile phone front shell hardware structure, including a front shell hardware component and a front shell plastic component. The side of the front shell hardware component is horizontally tapered inward to form an inward portion, which is completely wrapped by the front shell plastic component. The front shell hardware component has an adhesive surface that adheres to the front shell plastic component only at its bottom.

[0007] Preferably, in the aforementioned mobile phone front shell hardware structure, the gate on the front shell hardware is located within the plastic wrapping area corresponding to the inward portion, and the gate is removed by a die-cutting process.

[0008] Preferably, in the aforementioned mobile phone front shell hardware structure, the punched surface formed by the die-cutting process is flush with the outer surface of the front shell plastic.

[0009] Preferably, in the aforementioned mobile phone front shell hardware structure, the front shell hardware is formed by die casting, and the inward portion is an integrally formed internal tangential structure during the molding process.

[0010] Preferably, in the aforementioned mobile phone front shell hardware structure, the front shell plastic and the front shell hardware are combined through an in-mold injection molding process.

[0011] Preferably, in the aforementioned mobile phone front shell hardware structure, a stepped structure is formed between the recessed portion and the top surface of the front shell hardware, and the stepped structure is completely covered by the front shell plastic.

[0012] Preferably, in the aforementioned mobile phone front shell hardware structure, the material of the front shell hardware is a metal alloy.

[0013] Preferably, in the aforementioned mobile phone front shell hardware structure, the metal alloy is aluminum alloy or stainless steel.

[0014] Preferably, in the aforementioned mobile phone front shell hardware structure, the material of the front shell plastic is thermoplastic.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In this invention, the side of the front shell hardware component tapers inward along the horizontal direction to form an inward portion, which is completely wrapped by the front shell plastic, leaving only the bottom sealing surface that adheres to the front shell plastic. On the one hand, this significantly reduces the requirements for the flatness of the side of the front shell hardware component, reducing the rate of excess glue defects; on the other hand, the structure of the inward portion can be adapted to a more efficient mold punching process to remove the gate, replacing the costly and inefficient CNC cutting method, effectively reducing production costs while improving production efficiency and product yield. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the mobile phone front shell hardware in one embodiment of this utility model; Figure 2 This is a partially enlarged schematic diagram of detail A of the hardware component on the front shell of a mobile phone in one embodiment of this utility model; Figure 3 This is one embodiment of the present invention. Figure 2A schematic diagram of the structure of the mobile phone front shell hardware during the die-cutting process of the gate in the BB cross-section direction; Figure 4 This is a schematic diagram of the overall structure of the mobile phone front shell hardware and the front shell plastic sealant in one embodiment of the present invention; Figure 5 This is a partially enlarged schematic diagram of detail C on the front shell of a mobile phone in one embodiment of this utility model; Figure 6 This is one embodiment of the present invention. Figure 5 Schematic diagram of the cross-sectional structure of DD.

[0017] Among them, 1. Front shell hardware; 2. Front shell plastic; 3. Sealing surface. Detailed Implementation

[0018] The following is a more detailed description of a mobile phone front shell hardware structure according to the present invention, with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0019] For clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not detailed in detail, as they would confuse the present invention with unnecessary detail. It should be understood that in the development of any actual embodiment, numerous implementation details must be made to achieve the developer's specific goals, such as changes from one embodiment to another according to limitations related to the system or business. Furthermore, it should be understood that such development work may be complex and time-consuming, but is merely routine work for those skilled in the art.

[0020] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0021] Taking a certain model of mobile phone front shell as an example, the original front shell structure had two sealing surfaces 3: the side and the bottom, for the front shell metal part 1 and the front shell plastic part 2. During production, due to the difficulty in precisely controlling the flatness of the side of the front shell metal part 1, glue overflow frequently occurred, resulting in a high product defect rate. Furthermore, the gates of the front shell metal part 1 were individually removed by CNC, which consumed a lot of time and cost. At the same time, the complex mold slides also made mold processing and maintenance costs high, greatly increasing the production cost of this mobile phone front shell.

[0022] In view of this, such as Figure 1-6 As shown, this embodiment proposes a mobile phone front shell hardware structure, aiming to solve the problems of high flatness requirements, high risk of glue overflow, high production cost, and low production efficiency caused by the traditional double-sealing surface design of mobile phone front shells. This mobile phone front shell hardware structure includes a front shell hardware component 1 and a front shell plastic component 2. The side of the front shell hardware component 1 tapers inward in the horizontal direction to form an inward portion, which is completely wrapped by the front shell plastic component 2; the front shell hardware component 1 only has a sealing surface 3 at its bottom that adheres to the front shell plastic component 2.

[0023] Furthermore, the front shell hardware component 1 is made of a metal alloy, specifically aluminum alloy or stainless steel. Aluminum alloy offers advantages such as lightweight, good thermal conductivity, and moderate cost, meeting the basic requirements of weight control and structural strength for mobile phone front shells. Stainless steel, on the other hand, boasts higher rigidity and corrosion resistance, making it suitable for product scenarios with high durability requirements. Both can be stably manufactured to achieve the desired structure through molding processes.

[0024] The front shell hardware 1 is integrally formed using a die-casting process. This process involves injecting molten metal alloy into a precision mold cavity under high pressure and high speed, and then cooling and solidifying to form the desired structure. During the die-casting process, the side of the front shell hardware 1 contracts inward along the horizontal direction to form an inward shrinkage section. This inward shrinkage section is not formed by subsequent processing, but is an internally shaped structure integrally formed by die-casting simultaneously with the main body of the front shell hardware 1. This inward shrinkage section is located on the side of the front shell hardware 1 near the sealing surface 3, and is the area where the side of the front shell hardware 1 shrinks towards the interior of the main body of the front shell hardware 1. This integral molding design can ensure the connection strength between the inward shrinkage section and the main body of the front shell hardware 1, and can also avoid dimensional errors and cost increases caused by secondary processing. At the same time, a stepped structure with the same width as the shrinkage width of the inward shrinkage section is formed between the inward shrinkage section and the top surface of the front shell hardware 1. During the subsequent injection molding process, the stepped structure will also be completely wrapped by the front shell plastic 2, further enhancing the bonding stability between the hardware and the plastic.

[0025] Furthermore, the gate is the feed inlet for the front shell hardware part 1, and it needs to be cut off after molding. For example... Figure 3 As shown, the gate reserved during the die casting of the front shell hardware 1 is located in the corresponding area of ​​the inner recess. In this embodiment, the gate is specifically located in the upper part of the inner recess. Unlike the traditional design where the gates are individually removed by CNC due to the exposed sides of the front shell hardware and the high flatness requirements, this embodiment directly removes the sprue material of the gate using a die-cutting process after the front shell hardware 1 is formed. This allows for the removal of gates from multiple products at once, and the die-cut surface formed after die-cutting is flush with the outer surface of the front shell plastic 2, with an error controlled within ±0.02mm. This improves both the appearance flatness and significantly increases production efficiency.

[0026] In addition, according to experimental data, traditional CNC cutting can only process about 1,800 gates per hour, while the mold punching process in this embodiment can process about 18,000 gates per hour, which is 10 times more efficient. At the same time, the gate processing cost of a single mobile phone front shell is reduced from about 0.45 yuan to about 0.15 yuan, achieving the goal of cost reduction in large-scale production.

[0027] Furthermore, the material of the front shell plastic 2 is thermoplastic. In this embodiment, a composite material of polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS) is selected as the material of the front shell plastic 2. Its flowability and mechanical strength are suitable for the requirements of in-mold injection molding process. The front shell plastic 2 and the front shell hardware 1 can be integrated through in-mold injection molding process.

[0028] In the production of mobile phone front covers, the front cover metal parts 1 and the front cover plastic parts 2 need to be sealed through the sealing surface 3. In traditional designs, the front cover metal parts 1 and the front cover plastic parts 2 have two sealing surfaces 3: the side and the bottom. The side sealing relies on the mold slide, and the mold slide sealing has extremely high requirements for the flatness of the side of the front cover metal parts 1. Even a slight defect can easily lead to glue overflow.

[0029] In this embodiment, after the inward-shrinking section is set, the side of the front shell hardware 1 no longer directly serves as the sealing surface 3; only the bottom sealing surface 3 is retained, thus simplifying the sealing structure. Specifically, the die-cast front shell hardware 1 is precisely positioned and fixed in the injection mold cavity. After mold closing, molten PC / ABS composite material is injected into the cavity. Under pressure, the plastic material fully fills the space of the inward-shrinking section and the stepped structure of the front shell hardware 1, and only one sealing surface 3 is formed at the bottom of the front shell hardware 1, which is in contact with the front shell plastic 2. This sealing surface 3 is the only bottom sealing surface 3. In this embodiment, the front shell hardware 1 no longer needs to undergo strict control of the flatness of its side surface, which can effectively avoid poor glue overflow caused by insufficient side flatness, improve the reliability of sealing, and thus improve the yield of front shell injection molding.

[0030] In summary, in this embodiment, the side of the front shell hardware shrinks inward along the horizontal direction to form an inward portion, which is completely wrapped by the front shell plastic, leaving only the bottom sealing surface that is in contact with the front shell plastic. On the one hand, this can significantly reduce the requirements for the flatness of the hardware side and reduce the rate of excess glue; on the other hand, the structure of the inward portion can be adapted to a more efficient mold punching process to remove the gate, replacing the costly and inefficient CNC cutting method, effectively reducing production costs while improving production efficiency and product yield.

[0031] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A hardware structure for a mobile phone front cover, characterized in that, It includes a front shell hardware component and a front shell plastic component. The side of the front shell hardware component tapers inward in the horizontal direction to form an inward portion, which is completely wrapped by the front shell plastic component. The front shell hardware component has an adhesive surface at its bottom that is in contact with the front shell plastic component.

2. The mobile phone front shell hardware structure according to claim 1, characterized in that, The gate of the front shell hardware is located in the plastic-encased area corresponding to the inward portion, and the gate is removed by a die-cutting process.

3. The mobile phone front shell hardware structure according to claim 2, characterized in that, The die-cutting surface formed by the die-cutting process is flush with the outer surface of the front shell plastic.

4. The mobile phone front shell hardware structure according to claim 1, characterized in that, The front shell hardware is formed by die casting, and the inward section is an integrally formed internal structure during the molding process.

5. The mobile phone front shell hardware structure according to claim 1, characterized in that, The front shell plastic and the front shell hardware are combined through an in-mold injection molding process.

6. The mobile phone front shell hardware structure according to claim 1, characterized in that, A stepped structure is formed between the recessed portion and the top surface of the front shell hardware, and the stepped structure is completely covered by the front shell plastic.

7. The mobile phone front shell hardware structure according to any one of claims 1-6, characterized in that, The front shell hardware is made of metal alloy.

8. The mobile phone front shell hardware structure according to claim 7, characterized in that, The metal alloy is either an aluminum alloy or stainless steel.

9. The mobile phone front shell hardware structure according to any one of claims 1-6, characterized in that, The front shell plastic is made of thermoplastic.

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