CN112040681A

CN112040681A - Shell machining method, shell and electronic equipment

Info

Publication number: CN112040681A
Application number: CN201910482616.XA
Authority: CN
Inventors: 樊泽平
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-12-04

Abstract

The application provides a processing method of a shell, which comprises the following steps: the manufacturing method comprises the following steps of injection molding a shell base material, wherein the shell base material is made of a transparent material and comprises an inner concave surface and an outer convex surface which are arranged in a reverse manner; forming a transparent color layer on the inner concave surface; forming an imitation electro-plated silver layer on the inner concave surface, wherein at least part of the imitation electro-plated silver layer is overlapped with the transparent color layer; and forming a shading primer layer on the inner concave surface, wherein the shading primer layer covers the transparent color layer and the shading primer layer. The application provides a shell and electronic equipment. The processing method of the shell enables the shell substrate to present the effect of metal texture, and the preparation cost of the shell substrate and the coating on the shell substrate is far less than the cost of the metal shell with the same metal texture, so the embodiment provides a cost-saving shell processing method; moreover, the processing procedure of the housing substrate provided by the embodiment is simpler than that of a metal housing, and is more suitable for mass production.

Description

Shell machining method, shell and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a shell machining method, a shell and electronic equipment.

Background

With the pursuit of metal texture of the housing of electronic equipment such as mobile phones, electronic equipment manufacturers all process metal housings as the housing of the electronic equipment, but the housings made of metal materials have high cost and more strict processing process, thereby increasing the production cost of the electronic equipment. Therefore, how to provide a method for processing a housing of an electronic device, which can ensure the metal texture of the housing and reduce the cost of the housing, is a technical problem to be solved.

Disclosure of Invention

The application provides a shell processing method, a shell and electronic equipment, wherein the metal texture of the shell is ensured, and meanwhile the cost of the shell can be reduced.

In a first aspect, the present application provides a method for processing a housing, including: the manufacturing method comprises the following steps of injection molding a shell base material, wherein the shell base material is made of a transparent material and comprises an inner concave surface and an outer convex surface which are arranged in a reverse manner; forming a transparent color layer on the inner concave surface; forming an imitation electro-plated silver layer on the inner concave surface, wherein at least part of the imitation electro-plated silver layer is overlapped with the transparent color layer; and forming a shading primer layer on the inner concave surface, wherein the shading primer layer covers the transparent color layer and the shading primer layer.

In a second aspect, the present application provides a housing, which is formed by processing according to the processing method.

In a third aspect, the present application provides a housing, comprising: the shell base material comprises an inner concave surface or an outer convex surface which are arranged in a reverse manner, and is made of a transparent material; the transparent color layer covers the concave surface; the anti-electric-plating silver layer at least partially covers the transparent color layer; and the shading primer layer covers the anti-electro-plating silver layer.

In a fourth aspect, the present application provides an electronic device, which includes the housing.

The transparent shell base material is formed by injection molding, the transparent color layer and the imitation electroplated silver layer are formed on the inner concave surface of the shell base material, and the shading primer layer is arranged on the transparent color layer and the imitation electroplated silver layer, so that the shell base material has the effect of metal texture, and the preparation cost of the shell base material and the coating on the shell base material is far less than that of a metal shell with the same metal texture, so that the embodiment provides a shell processing method capable of saving cost; moreover, the processing procedure of the housing substrate provided by the embodiment is simpler than that of a metal housing, and is more suitable for batch production; in addition, because the casing base material is formed by the plastic material, the casing made of the casing base material can not cause interference or shielding to antenna signals in the electronic equipment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method for processing a housing according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a housing substrate according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a housing substrate and a transparent color layer provided in an embodiment of the present application.

Fig. 4 is a schematic structural diagram of the housing substrate, the transparent color layer, and the imitation silver plating layer provided in the embodiment of the present application.

Fig. 5 is a schematic structural diagram of the housing substrate, the transparent color layer, the imitation silver plating layer, and the light-shielding primer layer provided in the embodiment of the present application.

Fig. 6 is a schematic flow chart of a processing method of a housing according to a second embodiment of the present application.

Fig. 7 is a top view of a housing base material according to an embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of the housing substrate, the transparent color layer, the imitation silver plating layer, the shading primer layer, and the hardened layer provided in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The embodiments listed in the present application may be appropriately combined with each other.

Referring to fig. 1, fig. 1 is a flow chart illustrating a method for processing a housing. The application provides a processing method of a shell, which comprises the following steps.

In operation 101, referring to fig. 2, the housing substrate 10 is injection molded. The casing base material 10 is made of a transparent material. The shell substrate 10 includes an inner concave surface 11 and an outer convex surface 12 which are oppositely arranged.

Specifically, the injection molding, also called injection molding, is to inject a completely molten plastic material into a mold cavity at a certain temperature under high pressure, and to obtain the housing base material 10 after cooling and solidification. The plastic material includes, but is not limited to, polycarbonate (abbreviated as PC), polymethyl methacrylate (abbreviated as PMMA), and the like. The injection-molded case substrate 10 has a light transmittance greater than a predetermined value, for example, a light transmittance greater than 70%, and the like. Visually, the plastic sample is transparent, so that the plastic housing substrate 10 has a glass texture. In addition, the plastic substrate has better notch impact strength. For example, the notch of the plastic sample has a strong impact resistance, so that the housing base material 10 molded by the plastic material has good drop-resistant and impact-resistant properties.

Specifically, the housing substrate 10 is used for processing into a housing. The housing is applied to a battery cover of an electronic device, and the like. The electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a wearable device, and the like.

It is understood that the housing substrate 10 is made of plastic. When the plastic shell is used for electronic equipment, compared with a metal shell, the shell processed by the embodiment can save cost, has higher strength, reduces the risk of cracking, can also reduce the interference and shielding on antenna signals, and promotes good communication of the electronic equipment.

It is understood that the shape of the housing base material 10 may be an arc plate shape. Specifically, the shell can be a three-dimensional curved surface shell; or the shell is a 2.5D curved shell or a 2D curved shell. The outer convex surface 12 is a surface exposed to air when the housing is attached to the electronic device, and the inner concave surface 11 is a surface facing a battery or the like in the electronic device when the housing is attached to the electronic device. The housing in this embodiment, taking a mobile phone as an example, may be a housing that includes four side surfaces and a back surface and is integrally formed; it may be a part of the above-mentioned housing, for example, a battery cover on the back of the mobile phone only and not including the side of the mobile phone; or a local area of the battery cover on the back of the mobile phone, and the like. Of course, in other embodiments, the housing may also be flat.

In operation 102, referring to fig. 3, a transparent color layer 20 is formed on the inner concave surface 11.

In one embodiment, the transparent color layer 20 is a layer having a high transmittance and a color. Wherein, the light transmittance of the transparent color layer 20 is greater than 20%. The transparent color layer 20 covers the entire inner concave surface 11. When the shell base material 10 is viewed from the side of the outer convex surface 12 of the shell base material 10, the shell base material 10 is in the color of the transparent color layer 20, so that the shell base material 10 forming the transparent color layer 20 has a certain light transmittance and has a color. The color of the transparent color layer 20 includes, but is not limited to, black, blue, green, cyan, red, etc., to achieve that an electronic device may have a back cover of a variety of different colors. The specific color of the transparent color layer 20 is not limited herein.

In practical applications, the transparent color layer 20 may have some functions besides the basic color effect, for example, fluorescent particles are provided in the transparent color layer 20 to emit light in dark environment. In addition, the color of the transparent color layer 20 may be changed according to temperature, humidity, illumination, and the like.

In another embodiment, the transparent color layer 20 covers a portion of the inner concave surface 11. At this time, when the housing base material 10 is viewed from the side of the outer convex surface 12 of the housing base material 10, the portion of the housing base material 10 on which the transparent color layer 20 is disposed shows the color of the transparent color layer 20, and the portion of the housing base material 10 on which the transparent color layer 20 is not disposed is transparent, so that the colors of different regions of the housing base material 10 have different colors.

Specifically, the transparent color layer 20 is formed on the inner concave surface 11 by a method including, but not limited to, spraying, dipping, curtain coating, and the like. By using the above method, the thin transparent color layer 20 can be rapidly formed on the inner concave surface 11 of the housing substrate 10, so that the housing substrate 10 has a color without excessively increasing the thickness of the housing substrate 10, which is beneficial to the development of light and thin electronic devices.

In operation 103, referring to fig. 4, an electroplated silver layer 30 is formed on the inner concave surface 11, and the electroplated silver layer 30 at least partially overlaps the transparent color layer 20.

Specifically, the silver electroplating-like layer 30 is in the color of metallic silver, and has a high reflectivity for light, so that the housing substrate 10 can have an effect similar to a reflective surface of silver electroplating, and the housing substrate 10 has a high glossiness. It is understood that the material of the imitation silver plating layer 30 includes solvent, leveling agent, adhesive, metal particles (e.g., aluminum particles), etc., and the imitation silver plating layer 30 has the light reflecting effect of silver plating but the cost is much less than the cost of silver plating.

Specifically, the imitation silver plating layer 30 at least partially overlaps the transparent color layer 20. The silver plating-like layer 30 and the transparent color layer 20 are overlapped and disposed on the housing base material 10, so that the housing base material 10 has a colored metallic texture. When the transparent color layer 20 is blue, the plastic shell substrate 10 is similar to a blue metal shell after the transparent color layer 20 and the silver-plated imitation layer 30 are coated, so that the shell substrate 10 has a metal texture without reaching the cost for preparing the metal shell substrate 10, thereby providing a cost-effective shell processing method. Moreover, the transparent shell base material 10 is superposed with the imitation electrosilvering layer 30 and the transparent color layer 20, so that the formed shell has the texture of mirror surface treatment on the metal surface; or the shell has the texture formed by overlapping glass and metal.

It is understood that the present embodiment includes, but is not limited to, the following several molding methods: a transparent color layer 20 is first provided on the inner concave surface 11, and then a silver-plated imitation layer 30 is provided on the transparent color layer 20. Or, the silver electroplating-imitated layer 30 is firstly arranged on the inner concave surface 11, and then the transparent color layer 20 is arranged on the silver electroplating-imitated layer 30, so that at least part of the silver electroplating-imitated layer 30 and the transparent color layer 20 can be overlapped, and the overlapped part of the silver electroplating-imitated layer 30 and the transparent color layer 20 has a color effect and a metal reflection effect.

Specifically, the imitation silver plating layer 30 may cover the entire transparent color layer 20, so that the housing base material 10 has a metal texture. It can be understood that the imitation silver plating layer 30 may also cover a part of the transparent color layer 20, so that only the region of the housing substrate 10 where the transparent color layer 20 is disposed has a color effect, and the region of the housing substrate 10 where the transparent color layer 20 and the imitation silver plating layer 30 are disposed has a metal texture, so as to realize that the housing of the electronic device presents a differentiated visual effect. Of course, in other embodiments, the imitation silver plating layer 30 may be spliced with the transparent color layer 20 to provide a metallic reflective effect on one portion of the housing substrate 10 and a color effect on another portion of the housing substrate 10.

Specifically, the pattern of the electroplated silver layer 30 formed on the inner concave surface 11 includes, but is not limited to, spraying, dipping, curtain coating, and the like. In the above manner, a very thin imitation silver plating layer 30 can be rapidly formed on the inner concave surface 11 of the housing substrate 10, so that the housing substrate 10 has a metal texture and the thickness of the housing substrate 10 is not excessively increased.

In operation 104, referring to fig. 5, a light-shielding primer layer 40 is formed on the inner concave surface 11, and the light-shielding primer layer 40 covers the transparent color layer 20 and the imitation silver layer 30.

Specifically, the light-shielding primer layer 40 has a light-shielding effect to shield devices in the electronic device, and also prevents light from entering from the back surface of the electronic device (the side where the battery cover is located) and from exiting from the front surface of the electronic device (the side where the display screen is located), so that shadows of internal devices (such as a motherboard) appear on the display screen; in addition, the light-shielding primer layer 40 also has the function of protecting the transparent color layer 20 and the imitation silver layer 30 covered thereby, so as to prevent the housing base material 10 from being damaged during transportation and installation. The color of the light-shielding primer layer 40 is not limited in the present application.

In the embodiment, the transparent shell substrate 10 is formed by injection molding, the transparent color layer 20 and the imitation silver plating layer 30 are formed on the inner concave surface 11 of the shell substrate 10, and the shading primer layer 40 is arranged on the transparent color layer 20 and the imitation silver plating layer 30, so that the shell substrate 10 presents a metal texture effect, and the preparation cost of the shell substrate 10 and the coating on the shell substrate 10 is far less than that of a metal shell with the same metal texture, so that the embodiment provides a shell processing method with cost saving; moreover, the processing procedure of the housing substrate 10 provided by the embodiment is simpler than that of a metal housing, and is more suitable for mass production; in addition, since the housing base material 10 is formed of a plastic material, the housing made of the housing base material 10 does not interfere with or shield the antenna signal in the electronic device.

Referring to fig. 6, fig. 6 is a flowchart of another method for processing a housing according to an embodiment of the present disclosure. The method of processing the housing includes, but is not limited to, the following steps.

In operation 201, plastic particles are provided. Operation 201 includes, but is not limited to, the following steps.

Operation 211, selecting plastic particles. Wherein, the plastic particles have better chemical resistance. In other words, the housing substrate 10 formed by the plastic particles does not have a strong chemical reaction with the material of the coating layer when the subsequent coating layer such as the transparent color layer 20 is sprayed, and still maintains a good chemical stability. And the plastic particles have better toughness, so that the notch impact strength of the shell base material 10 formed by the plastic particles is more than 10kj per square meter. For example, the plastic particles include, but are not limited to, Polycarbonate (PC) and polymethyl methacrylate (PMMA).

Operation 212, drying the plastic particles. The plastic particles are dried for 2-6 hours by adopting a dehumidifying dryer or a hot air dryer at the drying temperature of 100-120 ℃, so that the moisture content in the plastic particles is not more than 0.05 percent, the density of the shell base material 10 formed by the plastic particles is high, the uniformity is good, the toughness of the shell base material 10 is strong, the defects such as bubbles in the shell base material 10 are few, and the forming quality of the shell base material 10 is improved.

In operation 202, referring to fig. 2, the housing substrate 10 is injection molded. Operation 202 includes, but is not limited to, the following operations 221-224.

Operation 221, an injection mold is provided. Wherein the shape of the injection mold is customized in advance according to the size, appearance shape and the like of the housing base material 10 to be molded. The injection mold comprises a male mold plate and a female mold plate. The cavity plate has a cavity surface adapted to the shape of the outer convex surface 12 of the housing base material 10. The male template comprises a male mold core. The female die core and the male die core are covered to form a die cavity. When the female die core and the male die core are covered, the female die core and the male die core body are buckled. The male die core comprises a male die core body and a sliding block, wherein the male die core body is provided with a through hole, the sliding block is positioned in the through hole and is in clearance fit with the inner wall of the through hole, and the sliding block can slide in the through hole so as to be close to or far away from the female die core. When the distance between the slide block and the cavity is a preset distance, the shape of the mold cavity is the shape of the shell base material 10 to be molded. As can be appreciated, the predetermined pitch is the thickness of the housing base material 10 to be formed.

Before the plastic base material is injected, the first mold closing is carried out, the male mold plate and the female mold plate, the male mold core body and the female mold core are completely closed, the mold closing force is provided by the injection molding machine and the compression spring, at the moment, a first interval is formed between the sliding block and the female mold core, and at the moment, the first interval is close to the thickness of the mold cavity between the male mold core body and the female mold core. And the first spacing is maintained by spring force and injection molding machine pressure. After the first mold closing, the method further comprises the following steps: preheating a frame mold and an injection mold, adding the injection mold on an injection molding machine table by a travelling crane, and heating the injection mold to a working temperature by a mold temperature controller or electric heating, wherein the working temperature is usually between 150 and 260 ℃, so that the phenomenon that the temperature difference between the molten plastic base material and the injection mold is large and the solidification or poor liquidity is avoided when the molten plastic base material is injected subsequently.

It can be understood that the inner surface finish degree of the core surface of the core insert and the inner surface finish degree of the core surface of the cavity insert should be within a preset range, so as to ensure that the surface of the transparent plastic shell to be molded obtained after demolding is smooth and bright.

An operation 222 injects a molten plastic substrate between the core and cavity.

Specifically, adding the dried plastic particles into a hopper of an injection molding machine; and adjusting the heating temperature of the plastic particles to 270-320 ℃ according to the physical characteristics of the plastic particles, and injecting the molten plastic base material into the mold cavity between the male mold core and the female mold core after the plastic particles form the molten plastic base material. The molten plastic substrate may be debubbled or the like prior to injection to reduce impurities and defects in the molten plastic substrate. The melted plastic base material has fluidity, and because the distance between the slide block and the cavity is close to the thickness of the die cavity between the core insert body and the cavity, the melted plastic base material can uniformly flow in the die cavity, thereby avoiding the defects that the fluidity difference of the melted plastic base material in the die cavity is large, the fluidity of the thick part of the die cavity is large, the fluidity of the thin part of the die cavity is small, and further the melted plastic filling is not full at the thin part of the die cavity, and the formed shell base material 10 at the thin part of the die cavity has the defects of over-thin and hollow, and the like.

And an operation 223 of pushing the slide block to approach the cavity insert so that the stroke of the slide block is a preset stroke.

Specifically, the second mold closing is performed when the injection of the molten plastic substrate is complete or about to be complete. And the second-time die assembly is to push the slide block to be close to the female die core, the distance between the slide block and the female die core is a preset distance, and the whole die cavity is filled with the molten plastic base material. It is understood that the difference between the first distance and the preset distance is the preset stroke. The preset stroke is 0.4 mm-0.7 mm. The distance between the slide block and the cavity is the thickness of the shell base material 10 by pushing the slide block to be close to the cavity, so that the melted plastic base material forms the shape of the shell base material 10 to be molded.

Operation 224 cools the molten plastic substrate to form the housing substrate 10.

Specifically, the molten plastic substrate is uniformly cooled by passing cooling water through the injection mold, which lasts about 10 to 40 seconds. And opening the mold to take the shell base material 10 after cooling. The injection molding machine drives the male mold part to retreat, so that the shell base material 10 is separated from the female mold side, and the product is taken out by a mechanical arm or a manual work.

In the above manner, in the process of molding the housing base material 10, the molten plastic base material has good fluidity in the injection mold, and the housing base material 10 with good molding quality is promoted.

In other embodiments, after the first mold closing, injecting a molten first portion of the plastic substrate between the core and the cavity, wherein the cavity between the core and the cavity is not filled; and driving the sliding piece to be close to the cavity insert until a second distance is formed between the sliding piece and the cavity insert. At this time, the second pitch is larger than the thickness of the case base material 10 to be molded; injecting the molten second part of the plastic base material between the male mold core and the female mold core; and driving the sliding part to be close to the female die core until a preset distance is formed between the sliding part and the female die core, wherein the preset distance is the thickness of the sliding part and the female die core which are shell base materials 10, and at the moment, the die cavity between the male die core and the female die core is filled up, so that the molten plastic base materials form the shape of the shell base materials 10 to be molded.

Specifically, the mass of the plastic substrate of the first portion is greater than the mass of the plastic substrate of the second portion. For example, the mass of the plastic substrate of the first portion is 80% to 90% of the total mass of the plastic substrate injected into the injection mold.

By injecting the molten plastic base material twice, after the molten plastic base material is injected for the first time, the cavity between the male mold core and the female mold core is not filled, the molten plastic base material has better fluidity in the cavity, and after the molten plastic base material is injected for the second time, the cavity between the male mold core and the female mold core is filled, so that the molded shell base material 10 is uniform and has few defects.

In operation 203, after the injection molding of the housing base material 10, the regions of the gate and flash of the injection molding process of the housing base material 10 are washed away by a numerical control machine (CNC). Specifically, the main shaft rotating speed of the CNC cutter is controlled to be 50000 +/-5000 rad/min, and the feeding is controlled to be 3000 mm/min. The water gap and the overflow level on the housing base material 10 are removed in the above manner, so that the surface of the housing base material 10 is free of residues in the injection molding process.

After the water gap and the flash of the case base material 10 are removed, the case base material 10 is subjected to ultrasonic cleaning. Placing the shell base material 10 in pure water by setting the ultrasonic frequency to be 40KHZ, and cleaning for about 4 min; the case base material 10 is dried at a temperature of 50 ± 5 ℃ after the case base material 10 is washed. The water gap and the overflow level on the housing base material 10 can be removed through the above operations, so that the surface of the housing base material 10 substantially forms a preset housing shape. A low viscosity electrostatic protection film is coated on the dried casing base material 10 to prevent the casing base material 10 from being damaged by collision in the process of transporting the casing base material 10, and the low viscosity electrostatic protection film is removed before the next operation.

It will be appreciated that the markings may be printed on the inner concave surface 11 of the housing substrate 10 after the operation of molding the housing substrate 10 or after removing the water gap and flash level of the housing substrate 10. The logo includes, but is not limited to, specific graphics, text, etc. so that the user can identify the manufacturer of the electronic device, etc. through the logo on the housing. Specifically, specific processes for printing indicia on the concave surface 11 of the housing substrate 10 include, but are not limited to, screen printing and offset printing. Describing by taking a screen printing technology as an example, a screen plate with the mesh number of 300 and 420 meshes is adopted, and the screen plate is placed on the inner concave surface 11 and is provided with a preset mark shape; the scraper is obliquely cut to enable the included angle between the scraper and the screen plate to be about 35 degrees, and the scraper is forcibly slid on the screen plate after the raw material of the mark is dipped on the scraper, so that the raw material of the mark permeates into the inner concave surface 11 through the screen plate and forms the shape of the mark on the inner concave surface 11. Standing the printed shell base material 10 for 30-60min, and baking at 50-60 ℃ for 60-90 min. And coating the dried shell base material 10 with a low-viscosity electrostatic protection film.

Since the housing base material 10 is made of a transparent material, the marks printed on the inner concave surface 11 of the housing base material 10 can be seen from the outer convex surface 12 side of the housing base material 10, that is, the marks can be seen from the outside of the electronic device by the user. Compared with the process of forming the mark on the metal shell through the processes of laser etching and the like, the forming process of the mark saves a large amount of manufacturing procedures, time cost and processing cost. And the mark is arranged on the inner concave surface 11 of the shell base material 10 and can not be damaged by external friction.

In operation 204, referring to fig. 3, a transparent color layer 20 is formed on the inner concave surface 11.

Specifically, the specific steps of operation 204 include, but are not limited to: spraying transparent colored paint on the inner concave surface 11, wherein the color type of the transparent colored paint is one or more; curing the clear pigmented paint to form the clear pigmented layer 20. In addition, operation 204 includes specific steps in operation 102, which are not described in detail herein.

In one possible embodiment, the clear paints are of one color type, and the clear paints of one color are sprayed over the inner concave surface 11 to form a uniform layer 20 of clear color on the inner concave surface 11.

In another possible embodiment, the transparent paints are of a plurality of colors, the transparent paints of the plurality of colors are sequentially sprayed on the same region, and the colors of the transparent paints are different, so that the inner concave surface 11 is gradually changed.

In yet another possible embodiment, the transparent paints are in a plurality of colors, and at least two different transparent paints are respectively sprayed on different areas of the inner concave surface 11. For example, the transparent colored paints of the multiple colors are respectively sprayed on different areas, and the different areas are not overlapped with each other, so that the different areas on the inner concave surface 11 are different colors, thereby realizing that the shell base material 10 presents a colorful pattern formed by splicing the multiple colors, and increasing the visual cool effect of the shell base material 10. For another example, the transparent paints of multiple colors are respectively sprayed on different areas, and the areas sprayed by the transparent paints of at least two colors are overlapped with each other, that is, the transparent paints of at least two colors are overlapped with each other, so that the transparent paints of two colors can be used to present three colors on the housing substrate 10, in other words, the method can be used to spray the transparent paints of fewer color types to form patterns of more color types.

It will be appreciated that the transparent color layer 20 may cover the entire interior concave surface 11 or cover portions of the interior concave surface 11. In this embodiment, the transparent color layer 20 covers the entire inner concave surface 11.

In the step of spraying the transparent colored paint on the inner concave surface 11, the shell base material 10 is clamped by a clamp, the surface layer of the inner concave surface 11 of the shell base material 10 is cleaned, a spray gun with the caliber of 0.8mm is adopted, and the transparent colored paint is sprayed on the inner concave surface 11 for multiple times under the gas pressure of 2-3 kg. The transparent colored paint is sprayed for multiple times, so that the point defects caused by the rebounding of the transparent colored paint on the concave surface 11 of the shell base material 10 are reduced by reducing the amount of the transparent colored paint sprayed for each time, and the forming quality of the transparent colored paint on the shell base material 10 is improved.

And in the step of curing the transparent colored paint, baking the transparent colored paint at 60-80 ℃ for 10-20 min.

The transparent color layer 20 provides a color effect to the housing base material 10 by forming the transparent color layer 20 on the housing base material 10.

In operation 205, referring to fig. 4, a silver plating-like layer 30 is formed on the inner concave surface 11.

Specifically, the specific steps of operation 205 include, but are not limited to: spraying imitation electroplating silver paint on the inner concave surface 11, wherein the imitation electroplating silver paint covers all the transparent color layers 20; and curing the imitation silver plating paint so that the imitation silver plating paint forms the imitation silver plating layer 30. In addition, operation 205 includes specific steps in operation 103, which are not described herein again.

In this embodiment, the imitation silver plating paint is sprayed on the transparent color layer 20 to form the imitation silver plating layer 30. Of course, in other embodiments, the artificial silver plating paint may be directly sprayed on the inner concave surface 11 of the housing substrate 10 to make the housing substrate 10 have a silver color. Of course, in other embodiments, the imitation silver plating paint covers a partial transparent color layer 20, so that one part of the housing base material 10 presents color effect and metal texture, and the other part presents color effect, so as to realize a plurality of different visual effects.

And in the step of curing the imitation silver plating paint, baking the imitation silver plating paint at 60-80 ℃ for 10-20 min.

The transparent color layer 20 and the electrosilvering-imitating layer 30 are formed on the housing base material 10, so that the housing base material 10 presents color effect and metal texture.

In operation 206, referring to fig. 5, a light-shielding primer layer 40 is formed on the inner concave surface 11, and the light-shielding primer layer 40 covers the transparent color layer 20 and the imitation silver layer 30.

Specifically, the specific steps of operation 206 include, but are not limited to: spraying shading primer on the whole inner concave surface 11; curing the opacifying primer to form the opacifying primer layer 40.

In this embodiment, a light-shielding primer layer 40 is formed by spraying a light-shielding primer on the whole inner concave surface 11, and the light-shielding primer layer 40 covers the transparent color layer 20 and the imitation silver plating layer 30. The light-shielding primer layer 40 has a light-shielding effect to shield devices in the electronic device, and also prevents light from entering from the back surface of the electronic device (the side where the battery cover is located) and from exiting from the front surface of the electronic device (the side where the display screen is located), so that shadows of internal devices (such as a motherboard) appear on the display screen; in addition, the light-shielding primer layer 40 also has the function of protecting the transparent color layer 20 and the imitation silver layer 30 covered thereby, so as to prevent the housing base material 10 from being damaged during transportation and installation.

Of course, in other embodiments, the light blocking primer may be directly sprayed on the inner concave surface 11 of the housing substrate 10, so that the housing substrate 10 takes on the color of the light blocking primer.

In the step of curing the shading primer, the shading primer is baked at 60-80 ℃ for 30-60 min. This process can completely dry the clear color layer 20, the imitation electro-silvered layer 30, and the opacifying primer.

It can be understood that, since the area of the water gap and the flash on the housing base material 10 is located on the outer concave surface 12 of the housing base material 10, and the transparent color layer 20, the silver-plated-on layer 30 and the light-shielding primer layer 40 are located on the inner concave surface 11 of the housing base material 10, the step of milling the area of the water gap and the flash on the housing base material 10 by the numerical control machine tool may be performed during or after the process of molding the transparent color layer 20, the silver-plated-on layer 30 and the light-shielding primer layer 40 on the inner concave surface 11.

Operation 207, referring to fig. 7, after the step of milling the area of the water gap and the flash on the housing substrate 10 by the numerical control machine and the step of forming the light-shielding primer layer 40 on the imitation silver layer 30, further includes:

the predetermined area 13 of the housing substrate 10 is ground. The preset area 13 comprises an area with milling cutter marks on the outer convex surface 12, an area with parting lines formed in the injection molding process on the outer convex surface 12, and an area with the transparent colored paint, the imitation silver plating paint and the shading primer on the outer convex surface 12. Further, the milling tool mark area is the tool mark left when the numerical control machine mills the water gap and the flash on the housing base material 10.

It will be appreciated that the water gap and flash on the casing substrate 10 are located on the outer convex surface 12 of the casing substrate 10. The parting line is a very small gap existing when the parting surface of the core insert and the parting surface of the cavity insert are closed, and the small gap causes the outer convex surface 12 of the shell base material 10 to form the parting line when the shell base material 10 is injection molded. The small gap corresponds to the position of the outer convex surface 12 of the casing base material 10, so that when the sliding member is driven to compress the molten plastic base material, partial gas in the mold cavity is released, and the sliding member cannot reach a preset stroke due to overlarge gas pressure in the mold cavity when the molten plastic base material is compressed. The parting line may be provided annularly on the outer convex surface 12 of the casing base material 10. The clear lacquer, the silver plating-like lacquer and the black matrix may splash onto the outer convex surface 12 of the housing base material 10 during the spraying of the clear lacquer, the silver plating-like lacquer and the black matrix.

Through the regional 13 of predetermineeing of casing substrate 10 of polishing to get rid of the sword mark on the casing substrate 10 and the region of paint that splashes, with the smooth and clean casing substrate 10 of shaping surface, and at the spraying transparent color paint imitative silver-plated paint reaches again to predetermineeing regional 13 after the shading priming paint and polish, can use once polish and can polish the sword mark on the casing substrate 10 and the paint that splashes, avoid needing to polish many times, improve the efficiency of casing substrate 10 processing.

Specifically, the step of grinding the preset region 13 of the housing base material 10 includes grinding the preset region 13 of the housing base material 10 by using a grinding wheel, which specifically includes but is not limited to: polishing a preset area 13 of the shell base material 10 by using a first grinding wheel, wherein the mesh number of the first grinding wheel is 800 meshes, and the polishing time of the first grinding wheel is 15-30 s; polishing the preset area 13 of the shell base material 10 by using a second grinding wheel, wherein the mesh number of the second grinding wheel is 1000 meshes, and the polishing time of the second grinding wheel is 15-30 s; polishing the preset area 13 of the shell base material 10 by using a third grinding wheel, wherein the mesh number of the third grinding wheel is 3000 meshes, and the polishing time of the third grinding wheel is 15-30 s; and polishing the preset area 13 of the shell base material 10 by using a fourth grinding wheel, wherein the mesh number of the fourth grinding wheel is 5000 meshes, and the polishing time of the fourth grinding wheel is 15-30 s. Of course, the present embodiment provides a better grinding wheel mesh and grinding time, but other grinding wheel meshes and grinding times can be used to form the shell substrate 10 with a smooth and clean surface.

In this embodiment, the preset region 13 of the shell base material 10 is sequentially polished by the first grinding wheel, the second grinding wheel, the third grinding wheel and the fourth grinding wheel to remove the tool marks and the paint splashing region on the shell base material 10, so as to form the shell base material 10 with a smooth and clean surface. The grinding wheel with gradually increased mesh number is adopted to polish the shell base material 10, so that the shell base material 10 is firstly subjected to rough polishing and then fine polishing, and the polishing efficiency is improved.

Further, please refer to fig. 7, which illustrates an example in which the housing substrate 10 is a battery cover of a mobile phone. The preset area 13 is an arc surface area on the battery cover, which is close to the side surface of the electronic device, and the preset area 13 is approximately in a shape of a square ring. The predetermined area 13 includes a straight extending area 131 and a corner area 132. In the step of polishing the predetermined region 13 of the housing base material 10, the grinding wheel is controlled to polish the linearly extending region 131 on the outer convex surface 12 at the rotation speed of 5000-.

Specifically, referring to fig. 7, the linear extending region 131 includes a first extending region 133, a second extending region 134, a third extending region 135 and a fourth extending region 136, wherein the first extending region 133 and the second extending region 134 both extend along the length direction of the electronic device. The third extending region 135 and the fourth extending region 136 both extend along the width direction of the electronic device. The corner regions 132 include four corner regions 132, and each corner region 132 is connected to a linearly extending region 131 extending along the width direction of the electronic device and a linearly extending region 131 extending along the length direction of the electronic device. Specifically, the parting line is located in the first extension area 133, the second extension area 134, the third extension area 135, the fourth extension area 136, and the corner area 132 between the adjacent two.

In the grinding process, the grinding wheel is controlled to grind the first extension area 133, the corner area 132 between the first extension area 133 and the second extension area 134, the corner area 132 between the second extension area 134 and the third extension area 135, the corner area 132 between the third extension area 135 and the fourth extension area 136, and the corner area 132 between the fourth extension area 136 and the first extension area 133 in sequence.

The straight extending area 131 and the corner area 132 are polished by controlling different speeds of the grinding wheel, so that smooth transition between the straight extending area 131 and the corner area 132 can be realized without occurrence of boundary lines or edges, the corner area 132 is polished by controlling the grinding wheel at a larger rotating speed to adapt to the curved shape of the corner area 132, the cambered surface forming of the corner area 132 of the shell base material 10 is promoted, and the shell base material 10 is facilitated to form a curved shell.

Further, after polishing the predetermined region 13 of the housing substrate 10, the method further includes: and polishing the preset area 13 of the shell base material 10 for 1min to 1.5min by adopting an aluminum oxide polishing solution with the particle diameter of 100nm to 200nm and matching with a wool wheel or a cloth wheel, so that the edge of the shell base material 10 is smooth and round, glittering and translucent, has no paint splash, and the preset area 13 is as smooth as a mirror surface.

After the sanding polishing, the case substrate 10 is subjected to ultrasonic cleaning. Placing the shell base material 10 in pure water by setting the ultrasonic frequency of 40KHZ, and cleaning for about 4 min; the case base material 10 is dried at a temperature of 50 ± 5 ℃ after the completion of the cleaning.

In operation 208, referring to fig. 8, after the step of polishing the predetermined region 13 of the housing substrate 10, the method further includes: spraying hardening liquid on the outer convex surface 12; and curing the hardening liquid to form a hardened layer 50 on the outer convex surface 12.

The hardness standard of the housing substrate 10 is made to meet the use standard by molding the hardened layer 50 on the outer convex surface 12 of the housing substrate 10. The hardened case substrate 10 can satisfy the following requirements: taking a shell base material 10 with the thickness of 10-15 mu m, marking 3 lines with the length of 3-5 cm on the outer convex surface 12 of the shell base material 10 from different directions by using a pencil at an angle of 45 degrees and a load of 1000g, and not forming a groove or a concave hole on the outer convex surface 12 of the shell base material 10; taking a shell base material 10 with the thickness of 10-15 mu m, rubbing an outer convex surface 12 of the shell base material 10 along a line with the length of 3-4cm by using 2 cm-2 cm steel wool, and testing frequency: 35-50 rubs/min for a total of 2500 rubs without forming a wire groove or scratch on the outer convex surface 12 of the housing base material 10; taking a shell base material 10 with the thickness of 10-15 μm, dropping a steel ball with the weight of 110g at the height of 20cm, and detecting four corner positions of the outer convex surface 12 of the shell base material 10 with emphasis, wherein the outer convex surface 12 of the shell base material 10 can not crack.

The transparent hardened layer 50 is formed through the spraying process, so that the uniform hardened layer 50 is formed on the surface of the shell substrate 10, rainbow lines are prevented from appearing on the surface of the shell substrate 10, the transparent hardened layer 50 formed through the spraying process is beneficial to testing the hardness of the shell substrate 10 after the hardening treatment through a plurality of hardness testing modes provided by the embodiment, and the fingerprint resistance of the surface can be improved and the yield can be improved.

The shell machining method further comprises machining hole positions through a numerical control machine tool. The hole site includes earphone hole, the interface of charging data line, goes out sound hole etc.. The main shaft rotating speed of a processing cutter of the numerical control machine tool is controlled to be 50000 +/-5000 rad/min, and the feeding is 3000 mm/min.

The melted plastic base material is injected into the injection mold, the distance between the sliding block and the cavity insert is larger, the flow rate of the melted plastic base material is improved, and the sliding block of the injection mold is driven to compress the melted plastic base material so as to form the uniformly-formed and high-quality shell base material 10; the transparent color layer 20, the silver-plating-imitating layer 30 and the shading primer layer 40 are sequentially formed on the inner concave surface 11 of the shell substrate 10, so that the shell substrate 10 presents a metal texture effect, and the preparation cost of the shell substrate 10 and the coating on the shell substrate 10 is far less than that of a metal shell with the same metal texture, so that the embodiment provides a cost-saving shell processing method; the washing and cutting tool marks, parting lines and splashed paint on the shell base material 10 are removed through one-time polishing, so that the surface smoothness of the shell base material 10 is improved, and the processing efficiency of the shell base material 10 is improved; the outer convex surface 12 of the shell substrate 10 is formed with the hardened layer 50, so that the hardness of the shell is improved, and the anti-falling performance of the electronic device is improved.

The application also provides a shell which is processed and formed by the processing method in any one of the above embodiments. The shell manufactured by the processing method has metal texture but lower cost.

The application also provides a shell, which comprises a shell substrate 10, a transparent color layer 20, an anti-electro-plating silver layer and a shading primer layer 40. The shell base material 10 comprises an inner concave surface 11 or an outer convex surface 12 which are arranged in a reverse mode, and the shell base material 10 is made of transparent materials. The transparent color layer 20 covers the inner concave surface 11. The anti-electro-silvering layer at least partially covers the transparent color layer 20. The light-blocking primer layer 40 covers the anti-electro-silvering layer.

The transparent color layer 20 and the imitation silver plating layer 30 are formed on the inner concave surface 11 of the shell substrate 10, and the shading primer layer 40 is arranged on the transparent color layer 20 and the imitation silver plating layer 30, so that the shell substrate 10 presents a metal texture effect, and the preparation cost of the shell substrate 10 and the coating on the shell substrate 10 is far less than that of a metal shell with the same metal texture, so that the embodiment provides a shell with a saved cost; moreover, the processing procedure of the housing substrate 10 provided by the embodiment is simpler than that of a metal housing, and is more suitable for mass production; in addition, since the housing base material 10 is formed of a plastic material, the housing made of the housing base material 10 does not interfere with or shield the antenna signal in the electronic device.

Wherein, the inner concave surface 11 is a three-dimensional arc surface. The outer convex surface 12 is a three-dimensional arc surface matched with the inner concave surface 11. Of course, in other embodiments, the concave surface 11 is a 2.5D curved surface, a 2D curved surface. The outer convex surface 12 is a 2.5D curved surface or a 2D curved surface matched with the inner concave surface 11.

The application further provides an electronic device comprising the housing according to any one of the above embodiments. The electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a wearable device, and the like. The housing in this embodiment, taking a mobile phone as an example, may be a housing that includes four side surfaces and a back surface and is integrally formed; it may be a part of the above-mentioned housing, for example, a battery cover on the back of the mobile phone only and not including the side of the mobile phone; or a local area of the battery cover on the back of the mobile phone, and the like. Of course, in other embodiments, the housing may also be flat.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the principles of the application, and it is intended that such changes and modifications be covered by the scope of the application.

Claims

1. A method of machining a housing, comprising:

the manufacturing method comprises the following steps of injection molding a shell base material, wherein the shell base material is made of a transparent material and comprises an inner concave surface and an outer convex surface which are arranged in a reverse manner;

forming a transparent color layer on the inner concave surface;

forming an imitation electro-plated silver layer on the inner concave surface, wherein at least part of the imitation electro-plated silver layer is overlapped with the transparent color layer;

and forming a shading primer layer on the inner concave surface, wherein the shading primer layer covers the transparent color layer and the shading primer layer.

2. The method of manufacturing a housing of claim 1, wherein the step of injection molding the housing base material comprises:

providing an injection mold, wherein the injection mold comprises a male mold core and a female mold core, the male mold core and the female mold core are covered to form a mold cavity, the male mold core comprises a male mold core body and a sliding block, the sliding block can slide relative to the male mold core body, and the distance between the sliding block and the female mold core is a preset distance, so that the shape of the mold cavity is the shape of a shell base material to be molded;

injecting the molten plastic base material between the male mold core and the female mold core;

pushing the sliding block to be close to the female die core so that the stroke of the sliding block is a preset stroke;

cooling the molten plastic substrate to form a housing substrate.

3. The method of claim 1, wherein said step of forming a transparent color layer on said inner concave surface comprises:

spraying transparent colored paint on the inner concave surface, wherein the color type of the transparent colored paint is one or more;

and curing the transparent color paint to form a transparent color layer by the transparent color paint.

4. A method for processing a shell according to claim 3, wherein when the transparent color paint has a plurality of colors, the transparent color paints of the plurality of colors are sequentially sprayed on the same region on the inner concave surface; or when the transparent colored paint has multiple colors, the transparent colored paint with at least two different colors is respectively sprayed on different areas on the inner concave surface.

5. The method for processing a case according to claim 3, wherein the step of curing the transparent color paint comprises baking the transparent color paint at 60 to 80 ℃ for 10 to 20 min.

6. The method of manufacturing a housing of claim 1, wherein said step of forming a simulated silver layer on said inner recessed surface comprises:

spraying imitation electroplating silver paint on the inner concave surface, wherein the imitation electroplating silver paint covers all the transparent color layers;

and curing the imitation silver plating paint to form an imitation silver plating layer.

7. The method for processing a shell according to claim 6, wherein in the step of curing the imitation silver plating paint, the imitation silver plating paint is baked at 60-80 ℃ for 10-20 min.

8. The method of manufacturing a housing according to claim 1, wherein the step of forming an opaque primer layer on the inner concave surface includes:

spraying shading primer on the whole inner concave surface;

curing the opacifying primer to form the opacifying primer layer.

9. The method of manufacturing a housing according to claim 8, wherein the step of curing the opacifying primer to form the opacifying primer layer comprises baking the opacifying primer at 60 ℃ to 80 ℃ for 30min to 60 min.

10. The method of manufacturing a housing according to claim 1, wherein the step of injection molding the housing base material further comprises:

and milling the water gap and the flash area on the shell substrate through a numerical control machine.

11. The method of processing a housing according to claim 10, wherein the step of milling the region of the water gap and the flash on the housing base material by the numerical control machine and the step of molding the light-shielding primer layer on the imitation silver plating layer are followed by:

polish the preset region of casing substrate, preset the region and include have on the outer convex surface mill the area of tool mark have on the outer convex surface the region of the parting line that injection moulding process formed the outer convex surface have transparent colour lacquer imitative silver-plating lacquer reaches the region of shading priming paint.

12. The method of claim 11, wherein the step of polishing the predetermined area of the housing substrate comprises:

polishing a preset area of the shell substrate by using a first grinding wheel, wherein the mesh number of the first grinding wheel is 800 meshes, and the polishing time of the first grinding wheel is 15-30 s;

polishing the preset area of the shell substrate by using a second grinding wheel, wherein the mesh number of the second grinding wheel is 1000 meshes, and the polishing time of the second grinding wheel is 15-30 s;

polishing a preset area of the shell base material by using a third grinding wheel, wherein the mesh number of the third grinding wheel is 3000 meshes, and the polishing time of the third grinding wheel is 15-30 s;

and polishing the preset area of the shell substrate by adopting a fourth grinding wheel, wherein the mesh number of the fourth grinding wheel is 5000 meshes, and the polishing time of the fourth grinding wheel is 15-30 s.

13. The method of claim 11, wherein the predetermined area is a square ring shape, and the predetermined area includes a straight extending area and a corner area;

in the step of polishing the preset region of the housing substrate, the grinding wheel is controlled to polish the linear extension region at the rotating speed of 5000-.

14. The method of processing a housing as recited in claim 11, further comprising, after grinding the predetermined area of the housing substrate:

polishing the preset area of the shell substrate for 1-1.5 min by adopting an alumina polishing solution with the particle diameter of 100-200 nm;

spraying hardening liquid on the outer convex surface;

and curing the hardening liquid to form a hardened layer on the outer convex surface.

15. The method of manufacturing a housing according to claim 1, wherein the step of injection molding the housing base material further comprises:

and printing marks on the inner concave surface by a screen printing technology or an offset printing technology.

16. A housing formed by processing according to any one of claims 1 to 15.

17. A housing, comprising:

the shell base material comprises an inner concave surface or an outer convex surface which are arranged in a reverse manner, and is made of a transparent material;

the transparent color layer covers the concave surface;

the anti-electric-plating silver layer at least partially covers the transparent color layer; and

and the shading primer layer covers the anti-electro-plating silver layer.

18. The housing of claim 17 wherein said concave surface is a three-dimensional arcuate surface and said convex surface is a three-dimensional arcuate surface mating with said concave surface.

19. An electronic device, characterized in that it comprises a housing according to claim 17 or 18.