CN112954098B

CN112954098B - Workpiece manufacturing method, workpiece and mobile terminal

Info

Publication number: CN112954098B
Application number: CN201911266314.5A
Authority: CN
Inventors: 邹凌云; 陈志斌; 杨伟
Original assignee: Oneplus Technology Shenzhen Co Ltd
Current assignee: Oneplus Technology Shenzhen Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2023-04-11
Anticipated expiration: 2039-12-11
Also published as: CN112954098A

Abstract

The invention provides a workpiece manufacturing method, a workpiece and a mobile terminal. The workpiece manufacturing method includes: plating a metal film layer on the carbon-containing silicon layer positioned on the surface of the workpiece body by using a physical vapor deposition process; forming a primer layer on a predetermined injection molding area of the metal film layer; a silicone gum portion is formed on the primer layer using an injection molding process. The technological process of the present invention is to plate one metal film layer on the surface of the carbon containing silicon layer, and the primer layer has excellent adhesion to the metal film layer and excellent adhesion to the primer layer.

Description

Workpiece manufacturing method, workpiece and mobile terminal

Technical Field

The invention relates to the technical field of silica gel injection molding, in particular to a workpiece manufacturing method, a workpiece and a mobile terminal.

Background

At present, the mobile phone industry raises a tide of irregular full-screen, and along with the increasing demand of consumers on the full-screen of the mobile phone, various large mobile phone manufacturers release a Liuhai screen and a water drop screen, and strive to improve the screen occupation ratio of the mobile phone. However, no matter how the improvement is, the size of the Liuhai screen is just up and down, substantial progress is difficult to be made, and the design of the lifting type camera solves the technical problem that the front camera of the full-screen mobile phone is placed everywhere.

But the lift design reduces the sealing performance of the mobile phone, the waterproof and dustproof performance is poor, and water and dust are easy to enter. Adopt the mode that silica gel was moulded plastics to mould plastics the waterproof silica gel of round on the surface of lifting support, can effectual waterproof and the dustproof function that improves the cell-phone. However, in the actual production process, it is found that the support subjected to PVD treatment overflows a predetermined injection molding region in the silica gel injection molding process, and the silica gel is firmly adhered on the region with the silica gel primer and is also adhered on other regions without the primer, so that the cleaning of the silica gel is difficult, and thus the injection molding process cannot be used for producing the sealing support.

Disclosure of Invention

In view of the above problems, the present invention provides a new workpiece manufacturing method, a workpiece, and a mobile terminal.

According to an embodiment of the present invention, there is provided a workpiece manufacturing method including:

plating a metal film layer on the carbon-containing silicon layer positioned on the surface of the workpiece body by using a physical vapor deposition process;

forming a primer layer on a predetermined injection molding area of the metal film layer;

a silicone gum portion is formed on the primer layer using an injection molding process.

In the above method for manufacturing a workpiece, after the silicone part is formed, the silicone overflowing to the metal film layer is removed.

In the above method for manufacturing a workpiece, the thickness of the metal film layer is 20nm to 40nm.

In the above-described method for manufacturing a workpiece, the metal film layer is formed using chromium, titanium, nickel, a chromium-titanium alloy, a nickel-chromium alloy, stainless steel, or zirconium.

In the above-described workpiece manufacturing method, the metal film layer is formed using chromium.

In the above-described method for manufacturing a workpiece, the undercoat layer is formed using one or more of ethyl acetate, polysiloxane, and epoxy resin.

In the above-described workpiece manufacturing method, the carbon-containing silicon layer is a metal carbide layer, a metal silicide layer, a metal silicon carbide layer, a silicon dioxide layer, or a silicon carbide layer.

In the above-described workpiece manufacturing method, the carbon-containing silicon layer is formed by a physical vapor deposition process before the metal film layer is plated.

In the workpiece manufacturing method, the workpiece is a lifting type camera support.

In the above-described workpiece manufacturing method, the workpiece body is a metal body.

According to another embodiment of the present invention, there is provided a workpiece produced by the above-described workpiece producing method, the workpiece including: the workpiece comprises a workpiece body, and a silicon-containing layer, a metal film layer, a bottom coating layer and an organic silica gel part which are sequentially stacked on the workpiece body.

In one embodiment, the workpiece is a lifting camera support.

In the workpiece, the thickness of the metal film layer is 20nm-40nm.

In the above workpiece, the metal film layer is formed using chromium, titanium, nickel, a chromium-titanium alloy, a nickel-chromium alloy, stainless steel, or zirconium.

In the above workpiece, the metal film layer is formed using chromium.

In the above work piece, the primer layer is formed using one or more of ethyl acetate, polysiloxane, and epoxy resin.

In the above workpiece, the carbon-containing silicon layer is a metal carbide layer, a metal silicide layer, a metal silicon carbide layer, a silicon dioxide layer, or a silicon carbide layer.

In the above workpiece, the carbon-containing silicon layer is a carbon-containing silicon thin film layer.

In the above workpiece, the body of the workpiece is a metal body.

According to another embodiment of the invention, a mobile terminal is provided, which comprises the lifting type camera support.

According to the workpiece manufacturing method, the metal film layer is plated on the surface of the carbon-containing silicon layer, the adhesive force between the bottom coating and the metal film layer is good, the adhesive force between the organic silica gel and the bottom coating area is also good, and the adhesive force between the organic silica gel and the metal film layer is poor in the area without the bottom coating, so that the problems of adhesive force and difficulty in cleaning the adhesive are well solved when the organic silica gel part is formed through injection molding.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.

FIG. 1 shows a schematic flow diagram of a method of manufacturing a workpiece according to an embodiment of the invention.

Fig. 2 shows a schematic structural view of an elevating type camera stand body according to an embodiment of the present invention.

Fig. 3 shows a schematic block diagram of an elevating camera stand according to an embodiment of the present invention.

Detailed Description

The terms as used herein:

"by 8230; \ 8230; preparation" is synonymous with "comprising". As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains" or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of 823070, 8230composition" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of 8230' \8230"; composition "appears in a clause of the subject matter of the claims and not immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or range defined by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of 1 to 5 is disclosed, the described range should be interpreted to include ranges 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, and 5, and so forth. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

In these examples, the parts and percentages are by mass unless otherwise indicated.

The mass part represents a basic unit of measurement of a mass ratio of the components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.

"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).

In order to solve the problem that the silica gel is bonded in a region without a primer in the injection molding process of the bracket subjected to PVD (physical vapor deposition) treatment, which causes difficulty in cleaning, the inventor conducts a great deal of research, and a great deal of experiments through changing raw materials, changing process parameters and the like, finds that carbon and silicon elements in a PVD film layer are combined with the injection molding silica gel to generate chemical bonds, so that the problem of difficulty in cleaning is caused. The silicone rubber in the present application refers to silicone gum, also referred to as silicone rubber.

The inventors tried to solve the above problems by using various methods, one is to remove carbon and silicon components in the PVD film and use different raw materials, but although the problem of silica gel injection molding glue is solved, the color of the product is greatly limited, for example, black color cannot be applied to the product.

The other method is to reserve carbon and silicon components in a PVD film layer to realize the color required by a product, and a transparent AF film layer (an anti-fingerprint film layer or a hydrophobic layer) is added on the color layer, so that the problem of silica gel adhesion can be effectively solved, but the adhesion between a silica gel primer and the AF film layer is insufficient due to the isolation effect of the AF layer, so that the bonding force between silica gel and the product in the area is not feasible, and the production cannot be realized.

Based on the scheme, the inventor uses laser to carve the area needing silica gel injection molding to remove the AF coating on the surface, and then brushes the primer and injects the silica gel. However, although this method can solve the problem of adhesive force of the silica gel adhesive, due to the limitation of laser engraving, the engraving on the inner side of the corner of the product is not in place, and if AF is in a transparent state, it cannot be determined whether AF is removed completely, which not only increases the cost in the process, but also has the quality risk that part of the product is still not adhesive.

After numerous attempts and investigations, the inventors found that by applying a metal film layer on the surface of a PVD film layer containing silicon carbide, the adhesion of the silica gel to the primer region is good, while in the region without primer, the adhesion of the silica gel is poor, thereby solving the problems of adhesion and difficulty in cleaning the gel well.

As shown in fig. 1, one embodiment of the present invention provides a workpiece manufacturing method including: in step S100, a metal film layer is plated on the carbon-containing silicon layer on the surface of the workpiece body by using a physical vapor deposition process; in step S200, forming a primer layer on a predetermined injection molding region of the metal film layer; in step S300, a silicone part is formed on the primer layer using an injection molding process.

The workpiece manufacturing method of the invention can be applied to workpieces which have a carbon-containing silicon layer on the surface of a workpiece body and need to form an organic silica gel part on the carbon-containing silicon layer by injection molding, and can be used for a lifting camera support (hereinafter referred to as a support) of a mobile terminal. The organic silicon rubber part can be used as a sealing piece to prevent water and dust.

The support body as the lifting type camera support can be made of metal materials, such as stainless steel, so that the support is high in strength. The workpiece of the present invention can be manufactured directly using a product having a carbon-containing silicon layer on the surface of the workpiece body. It is also possible to form a carbon-containing silicon layer on the workpiece body before step S100, and then perform the subsequent steps. The carbon-containing silicon layer can be formed on the whole surface of the workpiece body according to actual requirements, and can also be formed on part of the surface of the workpiece body.

For example, metal carbides, metal silicides, metal silicon carbides, silica or silicon carbides, etc. may be formed as decorative film layers on the stent body, which may impart color and improve wear resistance to the stent. More specifically, canTo form, for example, crC, tiC, crSiC, tiSiC, crCN, tiSiCN, crSiCN, WC, siO ₂ A silicon-carbon containing material layer of SiC.

The PVD film of the above materials is preferably formed using a Physical Vapor Deposition (PVD) process, whereby a desired color can be obtained. The PVD film layers of these materials may be black, gray, blue black, blue gray, and the like. Physical vapor deposition is a technique of vaporizing the surface of a solid or liquid material source into gaseous atoms, molecules or partially ionized ions by a physical method under vacuum conditions, and depositing a film having a specific function on the surface of a substrate by a low-pressure gas process. The materials are difficult to form into a thin film layer by other physical methods, and the film layer can be formed by a chemical mixing reaction method, but the quality of the film layer is not as good as that of a PVD film layer. Even if a carbon-containing silicon layer is formed by a chemical mixing reaction, since silicon and carbon are contained, there is a problem of sticking when an organic silicone part is formed later.

The PVD film layer containing silicon and carbon is preferably sputtered, for example, the workpiece sample can be placed in a vacuum environment, and a multi-target continuous magnetron sputtering method is adopted in a single film coating furnace chamber for coating, and the total coating pressure is preferably controlled to be 0.30Pa to 0.50Pa, for example, 0.35Pa, 0.40Pa, and 0.45Pa. The thickness of the silicon-containing carbon thin film layer is preferably 0.2 μm to 3.0. Mu.m, and may be, for example, 0.5. Mu.m, 0.8. Mu.m, 1.0. Mu.m, 1.5. Mu.m, 2.0. Mu.m, or 2.5. Mu.m.

After the carbon-containing silicon layer is formed on the surface of the workpiece body, a metal film layer is plated on the carbon-containing silicon layer by using a physical vapor deposition process in step S100. For example, after a PVD film layer containing carbon and silicon is formed on the surface of the lift-type camera support body, a metal film layer is formed on the PVD film layer containing carbon and silicon by using a PVD process. The metal film layer is also preferably sputtered, and the total pressure of the plating film is preferably 0.50Pa to 0.80Pa, and may be 0.60Pa or 0.70Pa, for example. In the application, the PVD process preferably adopts a sputtering mode, and the sputtering mode is better in uniformity and plating winding performance and is suitable for the lifting camera support.

The metal film layer may be formed using chromium (Cr), titanium (Ti), nickel (Ni), a chromium-titanium alloy (Cr/Ti), a nickel-chromium alloy (Ni/Cr), stainless steel (SUS), zirconium (Zr), or the like. The Ni target is less in PVD coating and has higher processing difficulty. Stainless steel does not perform as a surface coating as does metals such as Cr. However, the metal films of Ti and Zr having the same thickness showed a greater discoloration than the Cr film. Therefore, cr, ti, and Zr are preferable, and Cr is more preferable for forming the metal film layer.

The metal film layer is preferably 10nm to 40nm, and may be 15nm, 18nm, 20nm, 25nm, 30nm or 35nm, for example. When the thickness of the metal film layer is less than 10nm, the silica gel has certain anti-adhesion property after injection molding, the difficulty of cleaning the silica gel can be reduced, but the anti-adhesion property is possibly insufficient, so that the color change is preferably greater than or equal to 10nm and greater than 40 nm; when used for the elevating type camera head support, from the viewpoint of the blocking resistance and the color change, it is more preferably from 15nm to 35nm, further preferably from 18nm to 32nm.

After forming the metal film layer on the carbon-containing silicon layer, a primer layer is formed on a predetermined injection molding region of the metal film layer in step S200.

The adhesion is insufficient when the silicone part is directly formed on the metal film layer in the predetermined injection molding region on the metal film layer, and therefore, the primer layer is formed first to enhance the adhesion of the silicone part.

The primer may be applied to a predetermined region by a coating process, and the primer may be a mixture of one or more of ethyl acetate, polysiloxane, and epoxy resin. Baking may be performed after coating, for example, for 15-30min to form a primer layer.

After the undercoat layer is formed, an organic silicone part is formed on the undercoat layer using an injection molding process in step S300. The silica gel injection molding is a process of forming a silica gel elastomer by injecting solid or liquid silica gel through a mold and curing at high temperature.

Due to the processing technology, the precision of the workpiece body often cannot meet the precision requirement of injection molding sealing glue, and the glue cannot be sealed, so that silica gel remains in a non-injection molding area in the injection molding process. For example, the metal bracket used as the lifting camera bracket is often processed by powder metallurgy and has a grinding process, and the precision requirement of injection molding sealing compound cannot be met due to the overlapping tolerance. In addition, since the surface of the sealant is an appearance surface, if the sealant is too tight, scratches are easily generated, and therefore, the sealant cannot be too tight, which also causes silica gel to remain in a non-injection molding area during injection molding.

Finally, the residual silicone gel in the non-injection molding area can be removed at any time after the silicone gel part is injection molded, for example, for a lift type camera support, the residual silicone gel in the non-injection molding area is preferably removed immediately after the silicone gel part for sealing is formed, but can also be removed before being assembled to the mobile terminal. Because the surface of the carbon-containing silicon layer is plated with the metal film layer, the adhesive force between the bottom coating and the metal film layer is good, the adhesive force between the organic silica gel and the bottom coating area is also good, and in the area without the bottom coating, the silica gel is directly contacted with the metal film layer, so the adhesive property is poor, and the problems of adhesive force and difficult cleaning of the adhesive are well solved.

Another embodiment of the present invention provides a workpiece comprising: the workpiece comprises a workpiece body, and a silicon-containing layer, a metal film layer, a bottom coating layer and an organic silica gel part which are sequentially stacked on the workpiece body.

In the above workpiece, the thickness of the metal film layer is preferably 20nm to 40nm. The metal film layer may be formed using chromium, titanium, nickel, a chromium-titanium alloy, a nickel-chromium alloy, stainless steel, or zirconium, and is preferably formed using chromium. The primer layer may be formed using one or more of ethyl acetate, polysiloxane, and epoxy resin. The carbon-containing silicon layer may be formed using metal carbide, metal silicide, metal silicon carbide, silicon dioxide, or silicon carbide. The carbon-containing silicon layer is preferably a carbon-containing silicon thin film layer formed by a physical vapor deposition process. When the workpiece is the lifting camera support, the workpiece body is preferably a metal body, and more preferably stainless steel. Adopt the metal body can strengthen the intensity of support, feel and colour are better, can satisfy the high design requirement of cell-phone. For other details of the structure of the workpiece, reference may be made to the above-mentioned manufacturing method, which is not described herein again.

One example of a workpiece is a lift camera mount. Referring to fig. 2 and 3, the elevating type camera bracket body 110 shown in fig. 2 includes a predetermined injection molding region 111, and the predetermined injection molding region 111 may be formed in a groove shape, and the groove-shaped injection molding region may enhance a coupling force with silicone rubber. The elevating camera support 100 shown in fig. 3 includes a silicone rubber portion 112 formed on the surrounding injection molding region 111.

According to another embodiment of the invention, a mobile terminal is also provided, which includes the above lifting type camera support. The mobile terminal in the application can be a mobile phone, a tablet computer, a notebook computer and the like.

Hereinafter, the present invention will be described in detail by way of manufacturing examples of the stent, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.

Example 1

And placing the support body sample in a vacuum environment, and coating a film in a film coating furnace chamber in a sputtering mode to form a TiSiCN layer on the support body.

And moving the sample into another coating furnace, and forming a Cr metal film layer with the thickness of about 20nm by adopting a sputtering mode, wherein the coating power is controlled within 1KW, and the total coating air pressure is controlled within 0.50-0.80 Pa.

Then, the area of the sample requiring silica gel injection molding is coated with ethyl acetate as a primer, and baked for 20min to form the primer layer. And putting the sample into a mold to finish organic silica gel injection molding. And finally, removing the residual organic silica gel in the non-injection molding area.

Example 2

Essentially the same as example 1, except that: the thickness of the Cr metal film layer was about 30nm.

Example 3

Basically the same as in example 1, except that: the thickness of the Cr metal film layer was about 40nm.

Example 4

Basically the same as in example 1, except that: a CrSiCN layer was formed on the stent bulk sample.

Example 5

Essentially the same as example 4, except that: the thickness of the Cr metal film layer was about 30nm.

Example 6

Basically the same as in example 4, except that: the thickness of the Cr metal film layer was about 40nm.

Example 7

Essentially the same as example 1, except that: a TiC layer was formed on the stent body sample.

Example 8

Essentially the same as example 7, except that: the thickness of the Cr metal film layer was about 30nm.

Example 9

Essentially the same as example 7, except that: the thickness of the Cr metal film layer was about 40nm.

Comparative example 1

Essentially the same as example 1, except that the metal film layer was not plated.

Comparative example 2

Essentially the same as example 4, except that the metal film layer was not plated.

Comparative example 3

Essentially the same as example 7, except that the metal film layer was not plated.

TABLE 1 Stent color test results

After the metal film layer is formed, the silicone gel outside the predetermined injection molding area is easily removed. The color difference value between each embodiment and the corresponding control can utilize the formula:

and (4) calculating. As can be seen from the data in the above table, the color change after plating chromium is small between 20nm and 30nm, and the color after plating chromium is 40nmThe color change is large. Although not shown in the table, it was experimentally found that the color deviation further significantly increased after the chromium plating was more than 40 nm; the thickness of the other metal film layer is preferably 15nm to 35nm, more preferably 18nm to 32nm, but the metal film of Ti and Zr having the same thickness is more discolored than the Cr film.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims

1. A method of manufacturing a workpiece, comprising:

forming a carbon-containing silicon layer on the surface of the workpiece body through a physical vapor deposition process;

plating a metal film layer on the carbon-containing silicon layer on the surface of the workpiece body by using a physical vapor deposition process;

2. The method of claim 1, wherein after the silicone part is formed, the silicone gel overflowing the metal film layer is removed.

3. The method of claim 1, wherein the metal film layer has a thickness of 20nm to 40nm.

4. The method of manufacturing a workpiece according to claim 1, wherein the metal film layer is formed using chromium, titanium, nickel, a chromium-titanium alloy, a nickel-chromium alloy, stainless steel, or zirconium.

5. The workpiece manufacturing method according to claim 1, wherein the carbon-containing silicon layer is a metal carbide layer, a metal silicide layer, a metal silicon carbide layer, a silicon dioxide layer, or a silicon carbide layer.

6. The method of any one of claims 1 to 5, wherein the workpiece is a lift camera stand.

7. A workpiece produced by the workpiece producing method according to any one of claims 1 to 6, comprising: the workpiece comprises a workpiece body, and a silicon-containing layer, a metal film layer, a bottom coating layer and an organic silica gel part which are sequentially stacked on the workpiece body.

8. The workpiece of claim 7, wherein the workpiece is an elevating camera stand.

9. The workpiece of claim 8, wherein the metal film layer has a thickness of 20nm to 40nm.

10. The workpiece of claim 8, wherein the metal film layer is formed using chromium, titanium, nickel, a chromium titanium alloy, a nickel chromium alloy, stainless steel, or zirconium.

11. A mobile terminal comprising the elevating camera stand according to any one of claims 8 to 10.