CN102371646A - Preparation method of workpiece - Google Patents
Preparation method of workpiece Download PDFInfo
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- CN102371646A CN102371646A CN2010102514887A CN201010251488A CN102371646A CN 102371646 A CN102371646 A CN 102371646A CN 2010102514887 A CN2010102514887 A CN 2010102514887A CN 201010251488 A CN201010251488 A CN 201010251488A CN 102371646 A CN102371646 A CN 102371646A
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Abstract
The invention provides a preparation method of a workpiece. The method comprises technical points that: a workpiece film sleeve is arranged on a first mold body of a workpiece mold; the workpiece mold is composed of a first mold body and a second mold body; the workpiece film sleeve is composed of a first section and a second section; the shape of the first section is coupled with a first mold cavity of the first mold body; the shape of the second section is coupled with a second mold cavity of the first mold body; the workpiece film sleeve and the second mold cavity form a third mold cavity coupled with the workpiece; a resin composition is injected into the third mold cavity; the resin composition is cured, such that a composite workpiece is obtained; the workpiece film sleeve is peeled from the composite workpiece, such that the workpiece is obtained. Compared to existing technologies, with the method provided by the invention, a trace of a parting line is prevented from being left on the surface of the injection-molded workpiece. Therefore, an injection-molded workpiece with a good appearance quality can be obtained, and a subsequent polishing process specially carried out for removing the parting line trace is not required.
Description
Technical field
The present invention relates to the resin combination field shaping technique, be specifically related to a kind of preparation method of workpiece.
Background technology
In electronic product fields such as notebook computer, computer monitor, phone housing, all-in-one, be that the injection moulding workpiece of feedstock production has obtained using widely with the resin combination.Compare with the workpiece of traditional metal material, the injection moulding workpiece has advantages such as cheap, that production efficiency is high, moulding is easy.
When the injection moulding workpiece of some type of preparation, because the particularity of workpiece moulding need be provided with mould die joint (the mould die joint also can be called the Mosaic face that the mould splicing stays) at the cross section of workpiece stripping direction maximum.When this type of preparation injection moulding workpiece, in mould, inject the resin combination (like nylon-type and polystyrene type plastics) of fusion earlier, be cured then and obtain the injection moulding workpiece.Because the resin combination of fusion has high fluidity, therefore more or less can enter in the parting line of mould, thereby stay the parting line vestige at the surface of the work of injection moulding processing.When needs prepared the injection moulding workpiece of high polishing, the parting line vestige of surface of the work can be more obvious.
The parting line of injection moulding surface of the work can cause a lot of negative effects to the injection moulding workpiece.At first, parting line can influence the presentation quality of injection moulding surface of the work, therefore need carry out polishing to the injection moulding workpiece usually and eliminate parting line, and polishing has increased operation, lowers efficiency, and injection moulding workpiece cost is increased.Secondly, parting line also is not suitable for preparing the workpiece that the surface has continuous texture.Usually; In the prior art; When the preparation surface has the workpiece of continuous texture, need prepare texture respectively at two part inner surfaces of mould, but because texture is meticulousr usually; Therefore go out texture at the die joint of mould and be difficult to reach and be connected completely and mate, so cause the texture of surface of the work mismatching phenomenon or disruption to occur at the die joint place.In addition, accurate tiny continuous texture, the texture mispairing problem at surface of the work die joint place is more serious.In the prior art, usually can only surface of the work preparation discrete, irregular, or do not need the accurately problem of coupling, so the prior art surface of the work that can't solve at present forms the problem of continuous texture.
Summary of the invention
The problem that the present invention will solve is to provide a kind of preparation method of workpiece, and compared with prior art, the surface of the work of this preparation method's preparation the parting line vestige can not occur.
In order to solve above technical problem, the present invention provides a kind of preparation method of injection moulding workpiece, comprising:
Workpiece film cover is installed on first mold of workpiece mould; Said workpiece mould is made up of first mold and second mold; Said workpiece film cover is made up of first and second portion; The shape of first die cavity of the shape of said first and said first mold is complementary, and the partial shape of second die cavity of the shape of said second portion and said second mold is complementary, and said workpiece film cover is formed the 3rd die cavity that is complementary with said workpiece with said second die cavity;
In said the 3rd die cavity, inject resin combination;
Solidify said resin combination and obtain composite articles, said composite articles has said workpiece film cover;
Workpiece film cover peeled off from said composite articles obtain workpiece.
Preferably, the area that surrounds of the connecting line of said first and second portion greater than said first or said second portion said connecting line projected area on the whole.
Preferably, before on first mold that said workpiece film cover is installed in the workpiece mould, also comprise step:
Film is carried out the hot-forming workpiece film cover that obtains, and the shape of said workpiece film cover and the partial shape of said workpiece are complementary.Be specially, the shape of said workpiece film cover is complementary with the shape of the outer surface of said workpiece at least.
Preferably, said workpiece film cover is processed by rigid material or elastomeric material.
Preferably, said workpiece film cover is processed by PET, ABS, PE, PMMA, PP or PC.
Preferably, the thickness of said workpiece film cover is 0.05mm～1mm.
Preferably, the inner surface of said workpiece film cover is processed with first space pattern.
Preferably, said first space pattern is continuous texture, local grain or literal.
Preferably, said method also comprises step: the inner surface at said workpiece film cover applies mould release.
Preferably, said mould release is film-type mould release, solution-type mould release or paste mould release.
The present invention also provides a kind of product, comprising:
Housing;
Said housing is prepared by following method:
Housing film cover is installed on first mold of housing mould; Said housing mould is made up of first mold and second mold; Said housing film cover is made up of first and second portion; The shape of first die cavity of the shape of said first and said first mold is complementary, and the partial shape of second die cavity of the shape of said second portion and said second mold is complementary, and said housing film cover is formed the 3rd die cavity that is complementary with said housing with said second die cavity;
In said the 3rd die cavity, inject resin combination;
Solidify said resin combination and obtain combined housing, said combined housing has said housing film cover;
Housing film cover peeled off from said combined housing obtain housing.
Preferably, said product is computer or mobile phone.
The present invention provides a kind of preparation method of workpiece; The present invention installs workpiece film cover earlier on first mold of workpiece mould, the workpiece mould is made up of first mold and second mold, and workpiece film cover is made up of first and second portion; Workpiece film cover and second die cavity of second mould are formed and workpiece the 3rd die cavity that is complementary; In the 3rd die cavity, inject resin combination then, after the curing, workpiece film cover peeled off obtain workpiece.Compared with prior art; Owing in mould, be provided with workpiece film cover; Therefore resin combination can not flow to the parting line place of mould, therefore can not stay the vestige of parting line at injection moulding workpiece outer surface, so not only can obtain presentation quality good injection molding workpiece; Nor must adopt follow-up polishing program to remove the parting line vestige specially again, mentioned the production efficiency of workpiece.
Description of drawings
Fig. 1 is a workpiece film cover sketch map provided by the invention;
Fig. 2 is the surface topography sketch map of the injection moulding workpiece of the embodiment of the invention 1 preparation;
Fig. 3 is the surface topography sketch map of the injection moulding workpiece of comparative example 1 preparation;
Fig. 4 is a workpiece surface appearance partial enlarged drawing shown in Figure 3;
Fig. 5 is the surface topography sketch map of the injection moulding workpiece of the embodiment of the invention 2 preparations;
Fig. 6 is an injection moulding workpiece surface appearance partial enlarged drawing among Fig. 5;
Fig. 7 is the surface topography sketch map of the injection moulding workpiece of comparative example 2 preparations;
Fig. 8 is a workpiece surface appearance partial enlarged drawing shown in Figure 7.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
The embodiment of the invention provides a kind of preparation method of injection moulding workpiece, comprising:
Workpiece film cover is installed on first mold of workpiece mould; Said workpiece mould is made up of first mold and second mold; Said workpiece film cover is made up of first and second portion; The shape of first die cavity of the shape of said first and said first mold is complementary, and the partial shape of second die cavity of the shape of said second portion and said second mold is complementary, and said workpiece film cover is formed the 3rd die cavity that is complementary with said workpiece with said second die cavity;
In said the 3rd die cavity, inject resin combination;
Solidify said resin combination and obtain composite articles, said composite articles has said workpiece film cover;
Workpiece film cover peeled off from said composite articles obtain workpiece.
Compare in the prior art, the workpiece mould is made up of first mold and second mold, and said first mold and second mold are installed together and form the workpiece mould, and the intersection of first mold and second mold is a die joint; First mold has first die cavity, and second mold has second die cavity, and first die cavity and second die cavity surround the die cavity that the shape with workpiece is complementary.In the process that forms workpiece,, resin combination forms the parting line vestige at surface of the work thereby entering into die joint easily.The embodiment of the invention; Earlier workpiece film cover is installed on first mold of workpiece mould; Workpiece film cover is made up of first and second portion, and the shape of the shape of first and first die cavity is to coupling, and the partial shape of the shape of second portion and second die cavity is to coupling; The connecting line of first and second portion corresponding the position of die joint, die joint can be blocked by workpiece film cover like this.When first mold and second mold fit together, the 3rd die cavity of workpiece film cover and second die cavity composition.The shape of said the 3rd die cavity and workpiece is complementary.Because the die joint of first mold and second mold is blocked by workpiece film cover, when therefore in said the 3rd die cavity, injecting resin combination, thereby can prevent that resin combination from flowing in the die joint stays the parting line vestige at surface of the work.After in the 3rd die cavity, injecting resin combination and it being solidified, workpiece film cover forms composite articles with the resin combination that solidifies, and workpiece film cover is peeled off first from composite articles can be obtained workpiece then.According to the preferred embodiments of the invention; Workpiece has a base plate; The edge of said base plate extends to form sidewall to first side of said base plate, wherein, and first section first that extends to form said sidewall to said first side of said base plate at said edge; Said first is a smooth surface, and the projected area of said housing on plane, said base plate place is greater than the area of said base plate.Workpiece has the maximum cross-section area at the parting line place, in other words, the area of the face that the position surrounded corresponding on this workpiece with mould split line greater than this workpiece on the area in the said parallel cross section of the corresponding face that the position surrounded of mould split line.This moment workpiece film cover first or the second portion projected area on the face that first and second portion connecting line are surrounded less than area that said connecting line surrounded.
According to embodiments of the invention, said workpiece comprises the injection moulding workpiece that is used for electronic product well known to those skilled in the art, like phone housing, notebook computer shell, computer monitor shell, all-in-one shell etc., but is not limited thereto.The raw material of preparation injection moulding workpiece can be resin combination well known to those skilled in the art, like polyolefin resin, polystyrene resins, acrylic resin, fluororesin, polyamide-based resin, Merlon, polyethers resin, polysulfones resin, polyimide based resin, phenolic resins, amino resins and unsaturated-resin.Preferably, said resin combination is preferably plastic products such as polyolefin resin composition and polystyrene resins composition.
According to embodiments of the invention, the second portion for workpiece film cover can be complementary with the partial shape of second die cavity, and the area that this moment, the workpiece film overlapped is less than the area of the outer surface of workpiece; The shape of second portion also can be mated with the shape of said second die cavity fully, and this moment, the area of workpiece film cover equated with the area of the outer surface of workpiece.If instrument is a hull shape; Then the area for the surface of workpiece is meant the area of the outer surface of housing; For the housing workpiece, the area of workpiece film cover can promptly extend to the inner surface of housing greater than the area of housing outside; After injecting resin combination curing, workpiece film cover can be wrapped in the inside with workpiece.
According to embodiments of the invention; When in said workpiece film cover, injecting resin combination; Preferably, resin combination is heated to molten condition, the resin combination with molten condition is injected in the workpiece film cover or in described the 3rd die cavity then; Curable resin composition obtains overlapping the composite articles of forming by resin combination that solidifies and said workpiece film, workpiece film cover is stripped down obtain workpiece then.According to embodiments of the invention; Can the workpiece mould be installed in the preparation process that realizes above-mentioned injection moulding workpiece in the injection machine well known to those skilled in the art; Injection machine can be vertical injection molding machine well known to those skilled in the art, horizontal injection press, all electric injection machine; All can realize the object of the invention, embodiments of the invention do not have special restriction to this.
For said workpiece film cover; Can use rigid material or elastomeric material to prepare; The preferred elastomeric material that uses prepares; More preferably use plastics to prepare, like polypropylene-based resin PP, polythylene resin PE, polystyrene glycol ester PET, acrylonitrile-butadiene-styrene copolymer ABS, methyl methacrylate PMMA, polycarbonate etc. with certain toughness.When the plastics that use has certain toughness prepare workpiece film cover, help workpiece film cover stripped down from workpiece and recycle.For the thickness of workpiece film cover, embodiments of the invention do not have special restriction, are preferably 0.05mm～1mm, more preferably 0.1mm～0.9mm, more preferably 0.2mm～0.8mm, more preferably 0.3mm～0.8mm, more preferably 0.4mm～0.6mm.
For the preparation method of workpiece film cover, embodiments of the invention do not have special restriction, can adopt the method for injection moulding to make, and obtain through polishing then.Can be raw material with the film also, adopt hot press molding method then, obtain workpiece film cover after the cooling, all can realize the purpose of the embodiment of the invention.
According to the embodiment of the invention; When workpiece film cover is installed on mould; In order to help that final workpiece film cover is stripped down from composite articles, can apply mould release at the inner surface of workpiece film cover, behind the coating mould release; After injection moulding obtains composite articles in workpiece film cover or said the 3rd die cavity then, can easily workpiece film cover be taken off.For mould release; Embodiments of the invention do not have special restriction; Can use mould release well known to those skilled in the art; Object lesson can be film-type mould release, solution-type mould release, paste and wax shape mould release, and the example of film-type mould release has polyester mould release, polyethylene mould release, polyvinyl chloride mould release, glassine paper mould release, fluoroplastics mould release; The object lesson of solution-type mould release has slaine mould release, ketone mould release, acid amides mould release and the halogenated hydrocarbons mould release of hydro carbons mould release, alcohols mould release, carboxylic acid and carboxylic acid esters mould release, carboxylic acid; The object lesson of paste and wax shape mould release has silicone grease mould release, the heat-resisting ointment mould release of HK-50 etc.Concrete when selecting mould release, can select with injection moulding workpiece material according to workpiece film cover, separate as long as help the injection moulding workpiece put from the workpiece film, all belong to those skilled in the art's common practise according to unlike material selection mould release.
According to embodiments of the invention; When preparation surface has the workpiece of space pattern, can be pre-formed space pattern at the inner surface of workpiece film cover, after injecting resin combination then and solidifying; The space pattern of workpiece film cover inner surface just can have the workpiece of space pattern on injection moulding surface of the work moulding formation surface; Said space pattern can be preferably the continuous stereo pattern for continuous texture, local grain or literal, more preferably continuous texture.With prior art space pattern is molded over mould inner surface, because the problem of parting line, the phenomenon of mispairing or interruption appears in space pattern on the workpiece easily at the parting line place, thereby is difficult to form continuous space pattern at surface of the work.When embodiments of the invention formed continuous space pattern at workpiece film cover inner surface, space pattern did not have the influence of parting line, thereby the problem of mispairing or interruption can not occur separating continuously.
According to embodiments of the invention, when workpiece film cover inner surface forms continuous space pattern, can use film to be raw material, hot pressing forms space pattern on film in advance, and then the film that will have a space pattern carries out hot-formingly directly obtaining.Workpiece film cover has first and second portion; First should with the first die cavity shape of first mould to coupling; Second portion should with the partial shape of second die cavity of second mould to coupling, make workpiece film cover that the parting line of first mould and second mould is blocked fully as long as can access.Further, the shape of this workpiece film cover is complementary with the shape of the outer surface of said workpiece at least.Further the shape of this workpiece film cover also has the partial shape of work piece inner surface except the shape of the outer surface that comprises workpiece.
Compared with prior art, embodiments of the invention are installed earlier workpiece film cover on first mold of workpiece mould, when first mold and second mold fit together, and the 3rd die cavity of workpiece film cover and second die cavity composition.The shape of said the 3rd die cavity and workpiece is complementary.Because the die joint of first mold and second mold is blocked by workpiece film cover, when therefore in said the 3rd die cavity, injecting resin combination, thereby can prevent that resin combination from flowing in the die joint stays the parting line vestige at surface of the work.The curable resin composition moulding obtains composite articles then, and then workpiece film cover stripped down can obtain workpiece.Because the existence of workpiece film cover; Therefore resin combination can not flow into the parting line place of mould, therefore can not stay the parting line vestige at surface of the work, has improved the presentation quality of surface of the work; And the polishing program of having saved surface of the work, improved the formation efficiency of workpiece.
A kind of preferred embodiment in; The present invention forms continuous space pattern at workpiece film cover inner surface earlier; Like this workpiece film cover is installed in the mould; Inject then again workpiece film cover is peeled off after resin combination solidifies after, can obtain the workpiece that the surface has continuous space pattern.
The embodiment of the invention also provides a kind of electronic product, and said electronic product has housing, and said housing is obtained by the preparation method of above injection moulding workpiece provided by the invention.Compared with prior art, surface of shell does not have parting line, has therefore improved the presentation quality of housing, has saved the polishing program that the table of housing is showed off, and has improved the production efficiency of housing.This housing has a base plate; The edge of said base plate extends to form sidewall to first side of said base plate; Wherein, First section of said edge extends to form the first of said sidewall to said first side of said base plate, and said first is a smooth surface, and the projected area of said housing on plane, said base plate place is greater than the area of said base plate.
According to the embodiment of the invention; The object lesson of said electronic product can be electronic products such as mobile phone, notebook computer, display, all-in-one; All-in-one can be for having the all-in-one of functions such as fax, printing and duplicating; Also can be for display and cabinet are made computer together, electronic product according to the invention is not limited to this.Certainly can also be other product, teacup etc. for example.
The embodiment of the invention also provides a kind of electronic product; This electronic product comprises housing at least, and this housing has a base plate, and the edge of said base plate extends to form sidewall to first side of said base plate; Wherein, First section of said edge extends to form the first of said sidewall to said first side of said base plate, and said first is a smooth surface, and the projected area of said housing on plane, said base plate place is greater than the area of said base plate.
Below with specific embodiment and comparative example technical scheme of the present invention is described, but protection scope of the present invention does not receive the restriction of following examples.
Embodiment 1
Used thickness is that the polyethylene film of 0.2mm is material, and is hot-forming, obtains workpiece film cover as shown in Figure 1 after the cooling;
Workpiece film cover is installed on first mold of workpiece mould of injection machine; Spraying one deck polyurethane mould release is got second mold and first set of molds of workpiece mould then and is dressed up the workpiece mould in workpiece film cover, and workpiece film cover is positioned at this workpiece mould.This moment, workpiece film cover was formed the 3rd die cavity that is complementary with workpiece with second die cavity of second mold;
The polyphenylene oxide (PPO) that in the 3rd die cavity, injects fusion solidifies the composite articles that obtains having workpiece film cover;
Workpiece film cover taken off from composite articles obtain described injection moulding workpiece like Fig. 2.
Injection moulding workpiece outer surface is smooth smooth, does not have the parting line vestige.
Comparative example 1
The injection moulding workpiece of preparation and embodiment 1 shape;
Spraying one deck polyurethane mould release, close die then in the die cavity of mould;
Polyphenylene oxide (PPO) curing of in die cavity, injecting fusion obtains the injection moulding workpiece.
As shown in Figure 3, it is the enlarged drawing of Fig. 3 that there are parting line vestige, Fig. 4 in the place, maximum cross-section of injection moulding workpiece, and the parting line vestige is to enter into two die joints between the mold by resin combination to form.
Embodiment 2
Used thickness be the polyethylene terephtalate film of 0.3mm as raw material, suppress continuous textured pattern LENOVO in the one side of film earlier; Again with obtaining workpiece film cover after the film hot compacting cooling;
Workpiece film cover is installed on first mold of workpiece mould of injection machine;
Spraying one deck polyurethane mould release is got second mold and first set of molds of workpiece mould then and is dressed up the workpiece mould in workpiece film cover, and this moment, workpiece film cover was formed the 3rd die cavity that is complementary with workpiece with second die cavity of second mold;
The polyphenylene oxide (PPO) that in the 3rd die cavity, injects fusion solidifies the composite articles that obtains having workpiece film cover;
Workpiece film cover taken off from composite articles obtain described injection moulding workpiece like Fig. 5.
Injection moulding workpiece outer surface shown in Figure 5 is smooth smooth, and texture does not have the mispairing problem continuously, and partial enlarged drawing is as shown in Figure 6.
Comparative example 2
Use inner surface to have the mould of continuous textured pattern LENOVO;
In mould inner surface spraying one deck polyurethane mould release, close die then;
Polyphenylene oxide (PPO) curing of in mould, injecting fusion obtains the injection moulding workpiece;
The injection moulding workpiece is taken out, and picture on surface is as shown in Figure 7, and texture has the mispairing problem continuously, and partial enlarged drawing is as shown in Figure 8.
Therefore, when workpiece film cover is set at mould inner surface, can avoid parting line that the workpiece presentation quality is impacted.
More than the preparation method of injection moulding workpiece provided by the present invention has been carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. the preparation method of a workpiece is characterized in that, comprising:
Workpiece film cover is installed on first mold of workpiece mould; Said workpiece mould is made up of first mold and second mold; Said workpiece film cover is made up of first and second portion; The shape of first die cavity of the shape of said first and said first mold is complementary, and the partial shape of second die cavity of the shape of said second portion and said second mold is complementary, and said workpiece film cover is formed the 3rd die cavity that is complementary with said workpiece with said second die cavity;
In said the 3rd die cavity, inject resin combination;
Solidify said resin combination and obtain composite articles, said composite articles has said workpiece film cover;
Workpiece film cover peeled off from said composite articles obtain workpiece.
2. preparation method according to claim 1 is characterized in that, the area that the connecting line of said first and second portion surrounds greater than said first or said second portion said connecting line projected area on the whole.
3. preparation method according to claim 1 is characterized in that, before on first mold that said workpiece film cover is installed in the workpiece mould, also comprises step:
Film is carried out the hot-forming workpiece film cover that obtains, and the shape of said workpiece film cover and the partial shape of said workpiece are complementary.
4. preparation method according to claim 1 is characterized in that, said workpiece film cover is processed by rigid material or elastomeric material.
5. preparation method according to claim 1 is characterized in that, the thickness of said workpiece film cover is 0.05mm～1mm.
6. according to each described preparation method of claim 1 to 5, it is characterized in that the inner surface of said workpiece film cover is processed with first space pattern.
7. according to each described preparation method of claim 3, it is characterized in that, also comprise step:
Inner surface at said workpiece film cover applies mould release.
8. a product is characterized in that, comprising:
Housing;
Wherein, said housing is prepared by following method:
Housing film cover is installed on first mold of housing mould; Said housing mould is made up of first mold and second mold; Said housing film cover is made up of first and second portion; The shape of first die cavity of the shape of said first and said first mold is complementary, and the partial shape of second die cavity of the shape of said second portion and said second mold is complementary, and said housing film cover is formed the 3rd die cavity that is complementary with said housing with said second die cavity;
In said the 3rd die cavity, inject resin combination;
Solidify said resin combination and obtain combined housing, said combined housing has said housing film cover;
Housing film cover peeled off from said combined housing obtain housing.
9. product according to claim 8 is characterized in that, said product is computer or mobile phone.
10. a product is characterized in that, comprising:
Housing; Has a base plate; The edge of said base plate extends to form sidewall to first side of said base plate, wherein, and first section first that extends to form said sidewall to said first side of said base plate at said edge; Said first is a smooth surface, and the projected area of said housing on plane, said base plate place is greater than the area of said base plate.
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| CN2010102514887A CN102371646A (en) | 2010-08-11 | 2010-08-11 | Preparation method of workpiece |
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| CN103507204A (en) * | 2012-06-27 | 2014-01-15 | 比亚迪股份有限公司 | Molding method of injection molding element |
| CN103822118A (en) * | 2014-01-28 | 2014-05-28 | 徐松炎 | Light-transmitting LED (light-emitting diode) waterproof lamp group and manufacturing method thereof |
| CN106413294A (en) * | 2015-07-31 | 2017-02-15 | 联想(北京)有限公司 | Electronic equipment shell and preparation method thereof |
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| CN106413294B (en) * | 2015-07-31 | 2019-10-29 | 联想(北京)有限公司 | A kind of electronic equipment shell and preparation method thereof |
| CN110091471A (en) * | 2018-01-31 | 2019-08-06 | 北京小米移动软件有限公司 | Injection mold, the shell of mobile device and its processing method |
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Application publication date: 20120314 |