A volcano orifice plug jig and a manufacturing process thereof

Abstract

The application discloses a volcano hole plug jig and a manufacturing process thereof, and through the profiling integrated design of a plug body, an inner ring part and an outer ring part, when the plug body is assembled by being inserted into an inner hole of a volcano hole position through the inner ring part, the outer ring part is just covered on an arc edge area of the volcano hole position, a physical barrier is formed, direct contact of a polishing brush with an intersection of the arc edge area and an inner hole wall is blocked and excessive grinding is prevented, polishing for a long time is prevented from causing excessive wear of the arc edge, contour deformation and other collapse defects are completely eliminated, and meanwhile, a transition arc surface which is accurately matched with curvature of the arc edge of the volcano hole position is arranged on an outer circumferential surface of the outer ring part, in an assembled state, the transition arc surface uniformly transitions along an extension direction of the arc edge, the polishing brush is allowed to moderately grind an outer surface of the arc edge along a tangent direction of the transition arc surface, the arc edge area neither appears gloss loss due to being completely blocked nor encounters a collapse risk due to insufficient protection.

Description

Technical Field

[0001] This invention belongs to the field of mobile phone cover plate processing technology, and relates to a polishing fixture, specifically a crater hole plug fixture and its manufacturing process. Background Technology

[0002] In the manufacturing process of electronic products, housing components are typically made of glass, ceramic, or composite materials. To meet increasingly stringent appearance quality requirements, these housings need to be polished after molding to remove machining marks and achieve a smooth, glossy surface.

[0003] For housing components like mobile phone cover plates with camera openings, the edges of the openings are often designed as raised, crater-like arc edges to enhance structural strength or meet requirements such as waterproofing and decoration. However, this crater structure faces a significant technical challenge in the polishing process: because the arc edge protrudes from the main surface of the product, the rotating polishing brush will preferentially contact and grind the top of the arc edge and the junction between the arc edge and the inner wall of the opening. Prolonged polishing operations can easily lead to the arc edge area collapsing, resulting in excessive wear, contour deformation, or quality defects such as excessive grinding at the root of the arc edge leading to a dull edge. Furthermore, once collapse occurs, the entire product will be scrapped due to poor appearance, causing a significant decrease in yield. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a crater hole plug fixture and its manufacturing process, which solves the problem that the arc edge of the crater hole on the mobile phone cover plate is easily swept away during the polishing process.

[0005] The objective of this invention can be achieved through the following technical solutions: A crater hole plug fixture is fitted into a crater hole on a mobile phone cover to protect the crater hole during polishing. The crater hole has an inner hole and a raised arc edge. The crater hole plug fixture includes a plug body, an inner ring portion, and an outer ring portion. The outline shape of the plug body matches the outline shape of the crater hole. The inner ring portion is located at the bottom of the plug body and is adapted to mate with the inner hole of the crater hole to fit the plug body into the crater hole. The outer ring portion is evenly wrapped around the outer edge of the plug body to cover the arc edge area of ​​the crater hole in the assembled state.

[0006] Furthermore, the plug body, inner ring, and outer ring are integrally molded using glass fiber reinforced composite materials through injection molding.

[0007] Furthermore, the top of the plug is provided with a direction identification mark to indicate the correct assembly direction of the plug and the crater hole.

[0008] Furthermore, the plug body has a hollow cavity inside, which is filled with phase change energy storage material to absorb the heat generated during polishing and reduce the risk of thermal deformation of the plug body and the crater pores.

[0009] Furthermore, the inner ring has a hollow structure in the middle to reduce the overall weight of the fixture and save materials.

[0010] Furthermore, an annular elastic layer is provided on the outer circumferential surface of the inner ring. The annular elastic layer forms an elastic interference fit with the wall of the inner hole of the crater hole to enhance the fixing stability and compensate for the dimensional tolerance of the inner hole. A smooth guide structure is provided at the bottom of the inner ring to guide the inner ring into the inner hole of the crater hole.

[0011] Furthermore, the outer circumference of the outer ring is provided with a transition arc surface, the curvature of which matches the curvature of the arc edge of the crater hole.

[0012] Furthermore, a wear indicator layer is embedded on the surface of both the plug body and the outer ring. The wear indicator layer is made of a material that is different in color from the plug body. When the plug body or the outer ring wears down to a preset thickness, the wear indicator layer is exposed to indicate that the fixture needs to be replaced.

[0013] Furthermore, the surfaces of the plug body and the outer ring are coated with a diamond-like coating or a ceramic coating to improve the wear resistance of the fixture and reduce the friction coefficient during polishing.

[0014] A manufacturing process for a crater plug fixture as described above includes: Obtain the 3D model data of the crater holes on the phone's cover plate; Based on the 3D model data, the dimensions of the inner ring are designed to match the inner hole of the crater hole, and the outline of the outer ring is designed to cover the arc edge area of ​​the crater hole. The thickness of the plug body, inner ring, and outer ring is designed within a preset range; Manufacture an injection mold, use wear-resistant material for injection molding, and obtain a crater plug fixture.

[0015] The beneficial effects of this invention are as follows: The crater hole plug fixture provided by this invention, through the contour-integrated design of the plug body, inner ring, and outer ring, allows the plug body to be installed by inserting it into the inner hole of the crater hole through the inner ring. The outer ring precisely covers the arc edge area of ​​the crater hole, forming a physical barrier that prevents the polishing brush from directly contacting and excessively grinding the junction of the arc edge area and the inner hole wall. This completely eliminates the defects of excessive wear and contour deformation caused by long-term polishing. At the same time, by setting a transition arc surface on the outer circumference of the outer ring that precisely matches the curvature of the arc edge of the crater hole, the transition arc surface uniformly transitions along the extension direction of the arc edge in the assembled state. This allows the polishing brush to moderately grind the outer surface of the arc edge along the tangent direction of the transition arc surface, so that the arc edge area will not lose its gloss due to complete obstruction, nor will it suffer from the risk of collapse due to insufficient protection. By establishing a precise balance between physical isolation and polishing permission, the arc edge area of ​​the crater hole can maintain its complete contour and obtain a uniform and bright appearance quality after polishing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the use of the present invention.

[0017] Figure 2 This is a schematic diagram of the crater-shaped holes on the phone's cover.

[0018] Figure 3 This is a top view of the present invention.

[0019] Figure 4 This is a cross-sectional schematic diagram of the present invention.

[0020] Figure 5 This is a schematic diagram of the assembly state of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, this invention provides a crater hole plug fixture, which is used to fit into the crater hole 10 on a mobile phone cover plate to effectively protect the crater hole 10 during the polishing process. Figure 2 As shown, the volcano hole 10 on the mobile phone cover has an inner hole and an arc edge that protrudes upward from the edge of the inner hole. This protruding arc edge is a weak area that is very easy to be over-grinded and collapsed during the polishing process.

[0023] like Figures 3-4 As shown, the crater hole plug fixture mainly includes: a plug body 1, an inner ring portion 2, and an outer ring portion 3. The outline shape of the plug body 1 matches the outline shape of the crater hole position 10 to ensure a good fit between the plug body 1 and the crater hole position 10 after assembly. The inner ring portion 2 is located at the bottom of the plug body 1 and is used to fit and mate with the inner hole of the crater hole position 10, thereby stably assembling the entire plug body 1 within the crater hole position 10. The outer ring portion 3 is evenly arranged around the outer edge of the plug body 1, such as... Figure 5 As shown, when the fixture is in the assembly state, the outer ring 3 just covers the arc edge area of ​​the crater hole 10, which plays a role in physical isolation and protection, preventing the polishing brush from directly and excessively grinding the arc edge area of ​​the crater hole 10.

[0024] To achieve excellent mechanical strength and wear resistance, the plug body 1, inner ring 2, and outer ring 3 are made of glass fiber reinforced composite material and integrally molded using injection molding. This not only ensures the compactness and dimensional accuracy of the overall fixture structure but also eliminates the need for subsequent assembly, which is beneficial for mass production and cost control. The glass fiber reinforced composite material preferably contains 20%-40% glass fiber by mass, with the remainder being high-temperature resistant engineering plastics. These high-temperature resistant engineering plastics are made of polyetheretherketone, polyphenylene sulfide, or polyamide, enabling the fixture to withstand the high-speed friction of the polishing brush during repeated polishing without easily deforming or being damaged.

[0025] Specifically, the thickness of the plug body 1 is controlled between 1.0mm and 1.5mm, ensuring sufficient structural strength to withstand polishing pressure without being too thick and affecting the polishing brush's work on the area surrounding the crater hole 10. The width of the outer ring 3, i.e., the length extending outward from the edge of the plug body 1, is designed to be 1.5mm-3.0mm, and the thickness of the outer ring 3 is 0.3mm-0.5mm, allowing it to float above the arc edge of the crater hole 10, forming a protective barrier. The central part of the inner ring 2 is designed with a hollow structure 6, and the wall thickness of the inner ring 2 is set to 1.5mm-2.0mm. This reduces the overall weight of the fixture and saves injection molding material, lowering the unit cost.

[0026] To prevent operators from making directional errors during fixture installation, a direction identification mark 4 is provided on the top of the plug body 1. The direction identification mark 4 can be in the shape of an arrow, a triangular protrusion, or a recess, etc., to visually indicate the correct assembly direction of the plug body 1 and the crater hole 10. Operators only need to align the direction identification mark 4 with the preset position to quickly complete the installation, thereby effectively improving work efficiency and avoiding protection failure or product damage caused by reverse installation.

[0027] Considering the heat generated by high-speed friction during polishing, if this heat accumulates in the crater hole 10 area of ​​the phone cover, it may cause thermal deformation at the edge of the crater hole 10, thus affecting the dimensional accuracy of the product. Therefore, this invention provides a hollow cavity 5 inside the plug body 1, and fills this hollow cavity 5 with a phase change energy storage material. The phase change energy storage material is paraffin or hydrated salt, which utilizes its property of absorbing or releasing a large amount of latent heat near the phase change temperature. This allows it to effectively absorb and store heat during polishing, thereby reducing the overall temperature of the plug body 1 and the crater hole 10, significantly mitigating the risk of thermal deformation. Simultaneously, the design of the hollow cavity 5 also helps to further reduce the overall weight of the fixture.

[0028] To improve assembly stability and adaptability to product inner hole dimensional tolerances, an annular elastic layer 7 is provided on the outer circumferential surface of the inner ring portion 2. The annular elastic layer 7 can be made of silicone, rubber, or thermoplastic elastomer, and its outer diameter is slightly larger than the inner hole diameter of the crater hole position 10. When the inner ring portion 2 is inserted into the inner hole of the crater hole position 10, the annular elastic layer 7 forms an elastic interference fit with the hole wall, thereby providing uniform radial clamping force and effectively preventing the fixture from loosening or rotating due to vibration during polishing. Simultaneously, the annular elastic layer 7 can automatically compensate for minor dimensional deviations generated during inner hole machining, reducing the stringent requirements on the injection molding accuracy of the inner ring portion 2. Furthermore, to facilitate insertion, the bottom of the inner ring portion 2 is provided with a smooth guide structure, such as a chamfer or arc surface, which guides the inner ring portion 2 smoothly into the inner hole of the crater hole position 10, reducing insertion resistance and preventing scratches on the inner hole wall.

[0029] The outer circumferential surface of the outer ring 3 is provided with a transition arc surface 8, the curvature of which precisely matches the curvature of the arc edge of the crater hole 10. When the fixture is assembled in place, the transition arc surface 8 and the arc edge of the crater hole 10 transition evenly. This prevents excessive grinding of the arc edge area while allowing the polishing brush to perform moderate grinding and polishing on the outer surface of the arc edge of the crater hole 10 along the direction of the transition arc surface 8. This prevents the arc edge area from being completely blocked and thus avoids the problem of dull polishing. In this way, the required gloss level of the arc edge area is achieved during the polishing process, while eliminating the defects of slump.

[0030] To facilitate operators in determining the service life of the fixture, wear indicator layers are embedded on the surfaces of both the plug body 1 and the outer ring 3. These wear indicator layers are made of a material with a distinct color different from the plug body 1, and their embedding depth corresponds to a preset wear limit thickness. After multiple uses, if the surface wear reaches this preset thickness, the wear indicator layer will be exposed. Operators can then quickly identify visually that the fixture has reached the end of its service life and needs replacement, thus preventing protective failure due to excessive fixture wear.

[0031] To further improve the wear resistance of the fixture and reduce frictional resistance during polishing, the surfaces of the plug body 1 and the outer ring 3 are coated with a diamond-like carbon (DLC) coating or a ceramic coating. The DLC coating has extremely high hardness and a low coefficient of friction, which can significantly reduce frictional heat and debris generation between the polishing brush and the fixture, while extending the fixture's replacement cycle. The ceramic coating has excellent high-temperature resistance and wear resistance, making it particularly suitable for industrial applications requiring continuous polishing over extended periods. Both coatings can be uniformly adhered to the surfaces of the plug body 1 and the outer ring 3 using either physical vapor deposition (PVD) or chemical vapor deposition (CVD) processes.

[0032] This embodiment also provides the manufacturing process of the above-mentioned crater plug fixture, which specifically includes the following steps: S1. Obtain the 3D model data of the volcano-shaped hole 10 on the phone cover. This 3D model data can be obtained through reverse scanning or by directly calling the product design CAD model, and should at least include key parameters such as the inner hole diameter, the radius of curvature and height of the arc edge, and the hole depth.

[0033] S2. Based on the three-dimensional model data, design the dimensions of the inner ring 2 so that it can be positioned and matched with the inner hole of the crater hole 10. At the same time, design the outline of the outer ring 3 so that it can completely cover the arc edge area of ​​the crater hole 10.

[0034] S3, within a preset range, design the thickness of the plug body 1, the inner ring 2, and the outer ring 3. Specifically, the thickness of the plug body 1 is set to 1.0mm-1.5mm, the wall thickness of the inner ring 2 is set to 1.5mm-2.0mm, and the thickness of the outer ring 3 is set to 0.3mm-0.5mm; at the same time, a cavity 5 and a hollow structure 6 are reserved in the design.

[0035] S4. Based on the above design results, manufacture the injection mold. The mold adopts a high-precision mold core to ensure that the matching gap between the transition arc surface 8 and the product arc edge is controlled within ±0.05mm. Wear-resistant materials such as glass fiber reinforced composite materials are used for injection molding. The injection temperature is controlled at 280℃-350℃, the injection pressure is 80MPa-120MPa, the holding time is 3-8 seconds, and the mold temperature is 80℃-120℃.

[0036] S5 involves trimming, cleaning, and dimensional inspection of the formed crater plug fixture. Once qualified, it can be packaged and stored or directly put into production line use.

[0037] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A crater hole plug fixture, fitted into a crater hole (10) on a mobile phone cover plate to protect the crater hole (10) during polishing, the crater hole (10) having an inner hole and a raised arc edge, characterized in that, The crater hole plug fixture includes: a plug body (1), an inner ring (2), and an outer ring (3). The outline shape of the plug body (1) matches the outline shape of the crater hole (10). The inner ring (2) is located at the bottom of the plug body (1) and is adapted to fit into the inner hole of the crater hole (10) to assemble the plug body (1) into the crater hole (10). The outer ring (3) is evenly wrapped around the outer edge of the plug body (1) to cover the arc edge area of ​​the crater hole (10) in the assembled state.

2. The crater plug fixture according to claim 1, characterized in that, The plug body (1), inner ring (2) and outer ring (3) are integrally formed by injection molding using glass fiber reinforced composite material.

3. The crater plug fixture according to claim 1, characterized in that, The top of the plug (1) is provided with a direction identification mark (4) to indicate the correct assembly direction of the plug (1) and the crater hole (10).

4. The crater plug fixture according to claim 1, characterized in that, The plug body (1) has a hollow cavity (5) inside, and the hollow cavity (5) is filled with phase change energy storage material.

5. The crater plug fixture according to claim 1, characterized in that, The inner circle (2) has a hollow structure (6) in the middle.

6. The crater plug fixture according to claim 1, characterized in that, An annular elastic layer (7) is provided on the outer circumferential surface of the inner ring (2). The annular elastic layer (7) forms an elastic interference fit with the hole wall of the crater hole (10). A smooth guide structure is provided at the bottom of the inner ring (2) to guide the inner ring (2) into the inner hole of the crater hole (10).

7. The crater plug fixture according to claim 1, characterized in that, The outer periphery of the outer ring (3) is provided with a transition arc surface (8), the curvature of which matches the curvature of the arc edge of the crater hole (10).

8. The crater plug fixture according to claim 1, characterized in that, The surfaces of the plug (1) and the outer ring (3) are both embedded with a wear indicator layer. The wear indicator layer is made of a material that is different in color from the plug (1). When the plug (1) or the outer ring (3) is worn to a preset thickness, the wear indicator layer is exposed to indicate that the fixture needs to be replaced.

9. The crater plug fixture according to claim 1, characterized in that, The surfaces of the plug body (1) and the outer ring (3) are also coated with a diamond-like coating or a ceramic coating.

10. A manufacturing process for a crater plug fixture as described in any one of claims 1-9, characterized in that, include: Obtain the 3D model data of the crater holes on the phone's cover plate; Based on the 3D model data, the dimensions of the inner ring are designed to match the inner hole of the crater hole, and the outline of the outer ring is designed to cover the arc edge area of ​​the crater hole. The thickness of the plug body, inner ring, and outer ring is designed within a preset range; Manufacture an injection mold, use wear-resistant material for injection molding, and obtain a crater plug fixture.

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