CN107379596B

CN107379596B - Machining method of shell, shell and terminal equipment

Info

Publication number: CN107379596B
Application number: CN201710783557.0A
Authority: CN
Inventors: 曾赞坚; 曾武春
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-08-31
Filing date: 2017-08-31
Publication date: 2020-05-08
Anticipated expiration: 2037-08-31
Also published as: CN107379596A

Abstract

The invention discloses a processing method of a shell, which is used for processing the shell with an open pore, wherein the open pore has a designed pore diameter, and the processing method comprises the following steps: providing a shell base body, wherein a prefabricated hole is arranged on the shell base body, and the aperture of the prefabricated hole is smaller than the designed aperture; spraying the shell substrate; and expanding the aperture of the prefabricated hole to the designed aperture so as to remove the paint splashed into the prefabricated hole during spraying and form the open hole. The invention also provides a shell processed by the processing method and terminal equipment comprising the shell. The scheme of the invention can solve the problem of poor assembly caused by oil accumulation in the opening of the shell.

Description

Machining method of shell, shell and terminal equipment

Technical Field

The invention relates to the technical field of machining, in particular to a shell machining method, a shell and terminal equipment.

Background

The housing of the handset has various openings such as side key holes, card support holes, etc. Usually, a hole is formed on the semi-finished shell, and then the appearance surface is sprayed, so as to finally form the finished shell. During spraying, paint is easy to splash and deposit in the opening, so that gaps of parts matched with the opening, such as side keys, clamping supports and the like, are poor, and assembly is affected.

Disclosure of Invention

In view of the above, the invention provides a method for processing a housing, a housing and a terminal device, which can solve the problem of poor assembly caused by oil accumulation in an open hole.

A method for processing a housing, which is used for processing the housing having an opening, wherein the opening has a designed aperture, and the processing method comprises the following steps: providing a shell base body, wherein a prefabricated hole is arranged on the shell base body, and the aperture of the prefabricated hole is smaller than the designed aperture; spraying the shell substrate; and expanding the aperture of the prefabricated hole to the designed aperture so as to remove the paint splashed into the prefabricated hole during spraying and form the open hole.

A shell is processed by the processing method.

A terminal device comprises a card support and the shell, wherein the card support is inserted into the opening to form matching.

According to the scheme, the hole diameter of the prefabricated hole is reduced to reserve the machining allowance, the machining allowance is removed after spraying, and the hole is formed, so that splashed paint can be removed, and the problem of poor assembly caused by oil accumulation in the hole is solved.

Drawings

To more clearly illustrate the structural features and effects of the present invention, a detailed description is given below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic front view of a housing base according to an embodiment of the present invention;

FIG. 2 is a side view of the housing base of FIG. 1;

FIG. 3 is a cross-sectional structural schematic view of the housing base of FIG. 1;

FIG. 4 is an enlarged view of the structure at I in FIG. 3;

FIG. 5 is a schematic view of another enlarged structure at I in FIG. 3;

FIG. 6 is a schematic view of a portion of the structure at the preformed hole of FIG. 2;

fig. 7 is a schematic structural view of a milling cutter according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of an injection mold injection molding a housing base according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a housing of an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

The embodiment of the invention provides a shell processing method, which is used for processing a shell base body to obtain a shell with an opening. The shell base body is a shell material obtained by preprocessing of a front-end process, the shell base body already has the basic shape and the structure of the shell, and the shell can be a shell of terminal equipment.

The processing method comprises the following steps: providing a shell base body, wherein a prefabricated hole is arranged on the shell base body, and the aperture of the prefabricated hole is smaller than the designed aperture; spraying the shell substrate; and expanding the aperture of the prefabricated hole to the designed aperture so as to remove the paint splashed into the prefabricated hole during spraying and form the open hole.

Specifically, the shell base body with the prefabricated holes is processed through a front-end process. The front-end process may be one process or a combination of two or more processes. The housing base may be made using a suitable process or combination of processes as desired. For example, the housing base body with the prefabricated hole may be formed by injection molding in one step through a plastic injection molding process, or may be formed by a plastic injection molding process in combination with a hole forming process (a process of forming a hole), or may be formed by a metal forging process in combination with a hole forming process, or the like.

The aperture of the prefabricated hole is smaller than a design aperture, and the design aperture is the designed inner diameter value of the opening hole in the shell. In a subsequent step, the inner wall material of the preformed hole is removed to enlarge the aperture of the preformed hole to the design aperture. That is, when the housing base is manufactured, a machining allowance of the opening is reserved, and then the machining allowance needs to be removed.

Then, the housing base is sprayed. The housing base is not limited to plastic materials and metal materials, and therefore the spraying process is not limited to spraying on the plastic materials and the metal materials. The housing base body may have a sprayed surface, which may be an appearance surface, a surface requiring decoration or protection, or the like, and a non-sprayed surface, which may be an inner surface, a surface requiring no decoration or protection, or the like. The jig can be used for shielding the non-spraying surface to prevent the non-spraying surface from being splashed with paint, so that only the spraying surface is ensured to be attached with paint.

During the spraying process, paint may splash into the preformed holes, and the splashed paint needs to be removed after the spraying is completed. Since the machining allowance is reserved, the hole diameter of the prefabricated hole can be enlarged to the designed hole diameter by removing the machining allowance, so that the splashed paint is removed while the open hole is machined. It will be appreciated that the machining allowance is suitably selected, for example, to be greater than or equal to the thickness of the paint being splashed into the machining allowance so as to ensure that the paint being splashed into the machining allowance is completely removed after the machining allowance is removed. The value of the machining allowance can be determined by comprehensively considering the technological parameters such as the spraying speed, the spraying time, the spraying temperature, the paint type and the like, and the structural characteristics of the shell matrix and the prefabricated hole.

Therefore, according to the processing method of the embodiment, the hole diameter of the prefabricated hole is firstly reduced to reserve the processing allowance, and the processing allowance is removed after spraying to obtain the open hole, so that the paint splashed into the prefabricated hole can be removed, and the problem of poor assembly caused by oil accumulation in the open hole is solved.

In one embodiment, the step of expanding the aperture of the preformed hole to the design aperture may comprise: milling the prefabricated hole by a milling cutter, expanding the aperture of the prefabricated hole to the designed aperture to form the open hole, and forming a chamfer on the edge of the outward opening of the open hole. In other embodiments, other hole machining processes may be used to form the apertures and chamfers.

Specifically, in the present embodiment, as shown in fig. 1 to 3, the case body 10 may be a case material of a mobile phone case. As shown in fig. 1 to 3, a prefabricated hole 11 is formed in the housing base 10, wherein a dotted frame in fig. 1 indicates an area where the prefabricated hole 11 is located, and fig. 2 and 3 show a structure of the prefabricated hole 11. In this embodiment, the preformed hole 11 may be formed on a side surface of the housing base 10 having a small area, and the preformed hole 11 may be formed as a hole into which the mobile phone card holder is inserted after processing. However, in other embodiments, the preformed hole 11 may be a hole that is provided at any position of the housing base 10 and may be processed to be engaged with any component.

As shown in fig. 4, in the present embodiment, the prefabricated hole 11 may be milled by a milling cutter, the inner wall material of the prefabricated hole 11 is removed to form an opening 21, and a chamfer C is formed on an outward opening side of the opening 21. The spraying is carried out in the direction of the outer side of the housing base body 10; after the housing base 10 has been machined into a housing, the card holder is also inserted into the opening 21 on this side. The opening edge refers to an edge line of the opening outward of the opening hole 21. In fig. 4, the preformed hole 11 before milling is compared with the opening 21 formed after milling, and the two dotted lines represent the maximum contour of the preformed hole 11.

In the embodiment, the machining allowance is removed in a milling mode of the milling cutter, the machining precision is high, the size consistency is good, and the assembling requirement of the clamping support and the open hole 21 can be met. By further forming the chamfer C, the sharp edge of the original prefabricated hole 11 is removed, and the hand scraping is avoided; when the clamping support is matched with the chamfer C, the surface abrasion of the clamping support is small, so that the surface treatment (such as spraying, plating, anodic oxidation and the like) effect on the clamping support is more durable; but also makes the fit of the card holder with the opening 21 more stable. In other embodiments, other reaming processes may also be used to remove the machining allowance; and/or, a fillet may also be machined instead of the chamfer C.

In this embodiment, as shown in fig. 3 and 4, the housing base 11 may include a base large surface a and an arc-shaped side surface B connected to the base large surface a. The major surface a of the base body refers to the major appearance surface and the carrying surface of the housing base body 11, and has a larger area and is smoother. The arc side surface B is an arc surface connected with the large surface A of the base body, has a small area and can be positioned on one side or two sides of the large surface A of the base body. The preliminary hole 11 is opened on the arc-shaped side surface B so that the opening edge of the formed opening hole 21 is located on the arc-shaped side surface B. The opening edge is positioned on the arc-shaped side surface B. In other embodiments, the shape and configuration of the housing base body may be designed according to needs, and is not limited to the structure in this embodiment. In this embodiment, the housing base 11 may be formed by a plastic injection molding process to simultaneously form the large surface a, the arc-shaped side surface B and the prefabricated hole 11. In other embodiments, other processes may be used, such as the metal forging process described above in conjunction with the hole making process.

In one embodiment of this embodiment, the tool path of the milling tool is arranged such that the chamfers C are evenly distributed along the open edge. As shown in fig. 4, the path of the milling cutter may be set to produce a uniform chamfer C. The term "uniform chamfer C" means that the width L of the projection of the chamfer surface of the chamfer C is uniform at each position of the opening edge in the view shown in fig. 4, and such chamfer C is also called a profile C angle. The milling cutter path can be designed to be a three-dimensional milling path so as to mill a uniform chamfer C, namely, the working height of the milling cutter is adjusted according to the bending conditions of different positions on the edge of the opening so as to ensure that the milling amount of different positions on the edge of the opening is uniform and consistent. In this embodiment, the uniform chamfer C is more aesthetically pleasing.

In another embodiment of this embodiment, unlike the previous embodiment, the chamfers C are non-uniformly distributed along the opening edge, as shown in fig. 5. That is, in the view shown in fig. 5, the width L of the chamfer surface projection of the chamfer C, which is also called a two-dimensional tool path C angle, is different at each position of the opening edge. For example, the width L of the chamfer C is largest at the position where the curvature of the arc-shaped side B is largest, and gradually decreases at the remaining positions. The path of the milling cutter may be designed as a two-dimensional path to mill a non-uniform chamfer C. That is, when each position of the opening edge is milled, the working height of the milling cutter is always unchanged, so that the milling amount at different positions on the opening edge is different. For example, the milling amount is maximized at a position where the curvature of the opening edge is maximized, and the milling amount is gradually reduced at the remaining positions, thereby forming the non-uniform chamfer C. In the embodiment, the non-uniform chamfer C has a larger chamfer surface, which is beneficial to the surface treatment effect of the protective card holder and the assembly of the enhanced card holder.

In this embodiment, in the process of milling the prefabricated hole 11 to form the opening 21 and the chamfer C by the milling cutter, the milling cutter may cut twice to remove the machining allowance and machine the chamfer C.

Specifically, as shown in fig. 5, the tool path of the milling cutter may include a first tool path and a second tool path S, and the milling cutter travels along the first tool path and mills the prefabricated hole 11 to expand the aperture of the prefabricated hole 11 to the designed aperture; the milling cutter follows a second path S to form a chamfer C on the opening edge. The projection of the second tool path S at the view angle shown in fig. 5 is indicated by a dashed box, and the projection of the second tool path S is similar to the contour of the prepared hole 11 or the opening edge. The second tool path S may be a tool path such that the chamfer C is a uniform chamfer or a non-uniform chamfer. The two tool paths are designed, so that the milling cutter can be controlled in a segmented mode, and the milling precision is improved. In other embodiments, the milling cutter may also machine the bore 21 and chamfer C along a single pass. The feed design of single sword way does benefit to and promotes machining efficiency.

Fig. 6 is a schematic structure of the milling cutter 30. As shown in fig. 6, the milling cutter 30 may include a shank 31, a first blade 32, and a second blade 33. Wherein the second cutting edge 33 is adapted to follow the first cutting path to remove the machining allowance, and the first cutting edge 32 is adapted to follow the second cutting path S to machine the chamfer C. In order to make the second cutting edge 33 mill the inner wall of the prefabricated hole 11, the first cutting edge 32 rotates idle and does not cut the housing base body 10, and when the first cutting edge 32 processes the chamfer C, the second cutting edge 33 rotates idle and does not cut the inner wall of the opening 21, the milling height of the milling cutter 30 on the first cutting path is set to be larger than that on the second cutting path S. That is, the second cutting edge 33 is first milled along the first cutting path until the machining allowance is completely removed, and then the milling cutter 30 is lowered to the working height so that the first cutting edge 32 reaches the milling position and is fed along the second cutting path S. The milling height or the working height refers to a height value of a working position of the milling cutter 30 from a reference surface of a machine table, and the milling height or the working height can be set according to specific conditions.

In one embodiment, the processing method may further include: providing an injection mold; accordingly, the molding the housing base body through the plastic injection molding process may include: and forming the shell base body by using the injection mold through a plastic injection molding process.

Specifically, fig. 7 shows an injection mold 40 of the present embodiment. As shown in fig. 7, the injection mold 40 may include a male mold half 42, a female mold half 41, and a core 43, the male mold half 42 being fitted to the female mold half 41. The male mold half 42 has an outer convex surface 421, the female mold half 41 has an inner concave surface 411 facing the outer convex surface 421, and the outer convex surface 421 and the inner concave surface 411 enclose a mold cavity. The core 43 is inserted into the male mold 42 and the female mold 41 and penetrates the outer convex surface 421 and the inner concave surface 411. The parting surface of the mold cavity is the surface where the outer convex surface 421 fits the inner concave surface 411, and the mold cavity and the mold core 43 together form the housing base body 10. The outer convex surface 421 is used to form the inner surface of the housing base 10, the inner concave surface 411 is used to form the outer surface of the housing base 10, and the core 43 is used to form the preformed hole 11.

During injection molding, the injection mold 40 is filled with molten plastic material, so that the mold cavity is filled with the molten plastic material. During the filling process, pressure is maintained (i.e. a certain injection pressure is ensured for the molten plastic material in the mold cavity). The mold cavity is then cooled to solidify the molten plastic material within the mold cavity. Finally, the core 43 is removed and the male mold 42 and the female mold 41 are separated to release the mold, resulting in the housing base 10 having the preformed hole 11.

In one embodiment, the spraying the housing base body in the present machining method may include: shielding the non-spraying surface by using a jig; spraying a primer on the spraying surface; and spraying a finish paint on the primer. The primer is used for improving the adhesive force of the finish paint, and the finish paint is used for presenting rich color and texture. And a layer of varnish can be sprayed on the top coat to increase the glossiness and hardness of the top coat.

The embodiment of the invention also provides a shell which can be manufactured by adopting the processing method in the embodiment. Fig. 8 shows a schematic structure of the housing 20 of the present embodiment, wherein the housing 20 may be a housing of a terminal device such as a mobile phone, a tablet computer, and the like. As shown in fig. 5, 6 and 8, the housing 20 has an opening 21 (the area indicated by the dashed line frame in fig. 8), and the opening 21 is formed by machining the prefabricated hole 11 in the above embodiment. Of course, as shown in fig. 8, other features, such as snaps, stops, ribs, etc., may be provided on the housing 20. The shell 20 of the embodiment avoids the defect of oil accumulation in the opening 21, and the assembly clearance between the opening 21 and the part inserted into the opening 21 is good; after the chamfer C is arranged on the opening edge of the open pore 21, the scratch can be prevented, and the surface treatment (such as spraying, plating, anodic oxidation and the like) effect on the part can be ensured to be more durable; but also makes the fitting of the component to the opening 21 more stable.

The embodiment of the present invention further provides a terminal device, which may include a card holder and the above housing 20, where the terminal device includes, but is not limited to, a mobile phone and a tablet computer. Fig. 9 shows a schematic structure of the terminal device 100 of the present embodiment, in which the terminal device 100 is a mobile phone, and the housing 20 may be a rear case of the terminal device 100. The rear housing 20 is fitted with a card holder 22. As shown in fig. 8, the card holder 22 is inserted into the opening 21 to be fitted. Of course, other components may be inserted into and mated with the opening 21, such as side keys, headphone plugs, data line plugs, fasteners (e.g., screws), and the like.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for processing a housing, which is used for processing the housing having an opening, wherein the opening has a designed aperture, the method comprising:

providing a shell base body, wherein a prefabricated hole is arranged on the shell base body, and the aperture of the prefabricated hole is smaller than the designed aperture;

spraying the shell substrate;

expanding the aperture of the prefabricated hole to the designed aperture through a hole expanding process so as to remove the paint splashed into the prefabricated hole during spraying and form the open hole;

wherein the step of expanding the aperture of the preformed hole to the design aperture by a reaming process comprises:

milling the prefabricated hole by a milling cutter, expanding the aperture of the prefabricated hole to the designed aperture, and forming a chamfer on the edge of the outward opening of the opening,

wherein the cutter path of the milling cutter comprises a first cutter path and a second cutter path,

milling the prefabricated hole by a milling cutter, expanding the aperture of the prefabricated hole to the designed aperture to form the open hole, and forming a chamfer on the outward opening edge of the open hole, wherein the step of milling the prefabricated hole by the milling cutter comprises the following steps:

the milling cutter travels along the first cutter path and mills the prefabricated hole, and the aperture of the prefabricated hole is enlarged to the designed aperture to form the open hole; the milling cutter follows the second path to form a chamfer on the opening edge.

2. The method of manufacturing of claim 1, wherein the step of providing a housing base includes:

forming the shell body through a plastic injection molding process, so that the shell body is provided with an arc-shaped side surface, and the prefabricated hole is formed in the arc-shaped side surface;

wherein the tool paths of the milling cutter are arranged so that the chamfers are evenly distributed along the opening edge.

3. The method of manufacturing of claim 1, wherein the step of providing a housing base includes:

wherein the tool paths of the milling cutter are arranged so that the chamfers are non-uniformly distributed along the opening edge.

4. The processing method according to any one of claims 1 to 3,

the milling height of the milling cutter on the first cutter path is larger than that on the second cutter path.

5. The machining method according to claim 2 or 3, characterized by further comprising:

providing an injection mold; the injection mold comprises a male mold, a female mold and a mold core; the male die is attached to the female die, the male die is provided with an outer convex surface, the female die is provided with an inner concave surface facing the outer convex surface, and a die cavity is formed by the outer convex surface and the inner concave surface in a surrounding mode; the mold core is inserted into the male mold and the female mold and penetrates through the outer convex surface and the inner concave surface;

wherein, step through plastic injection molding process shaping the casing base member includes:

and forming the shell base body by using the injection mold through a plastic injection molding process.

6. The manufacturing method according to any one of claims 1 to 3, wherein the case base has a sprayed face and a non-sprayed face, and the step of spraying the case base includes:

shielding the non-spraying surface by using a jig;

spraying a primer on the spraying surface;

and spraying a finish paint on the primer.