CN106563919B - A kind of preparation method of mobile phone center, rear cover - Google Patents

A kind of preparation method of mobile phone center, rear cover Download PDF

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Publication number
CN106563919B
CN106563919B CN201610608581.6A CN201610608581A CN106563919B CN 106563919 B CN106563919 B CN 106563919B CN 201610608581 A CN201610608581 A CN 201610608581A CN 106563919 B CN106563919 B CN 106563919B
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forging
mobile phone
stamping
die casting
cover
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CN106563919A (en
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任项生
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Guangdong Evenwin Precision Technology Co Ltd
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Guangdong Evenwin Precision Technology Co Ltd
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Priority to CN201410264957.7A priority patent/CN104015009B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C18/00Alloys based on zinc
    • C22C18/04Alloys based on zinc with aluminium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/02Alloys based on magnesium with aluminium as the next major constituent

Abstract

The present invention relates to technical field of mobile phones, more particularly to the preparation method of a kind of mobile phone center, rear cover;The present invention passes through: die casting-forging and stamping-CNC-post-processing obtains mobile phone center, rear cover.The advantage of die casting, forging and stamping is embodied a concentrated reflection of, the consistency of product is ensure that while quick production, reaches the aesthetic requirement of metal appearance part.The technique reduces by 50% or more manufacturing cost, efficiency improves 60% or more.

Description

A kind of preparation method of mobile phone center, rear cover
The application is that application No. is 201410264957.7 divisional application, the original bill applyings date are as follows: 06 month 2014 13 Day, a kind of denomination of invention are as follows: the preparation method of mobile phone center, rear cover.
Technical field
The present invention relates to technical field of mobile phones, more particularly to the preparation method of a kind of mobile phone metal center, rear cover.
Background technique
Not only have exquisite appearance on mobile phone using metal center, shell, and have fine and smooth feel, wear-resisting, shatter-resistant, The advantages that anticorrosive, thus liked again by consumer.Wherein, rear cover a part important as mobile phone, smooth in appearance, Inside structure is complicated.The common practice of cell phone rear cover is at present: die casting (or forging and stamping) -- CNC-- appearance processing-rear cover;Die casting Has many advantages, such as high-efficient, the forming, part that can manufacture that structure is complicated, at low cost;Since melt is filled in compression mod at a high speed When, the phenomenon of sinuous flow can be generated, stomata or shrinkage hole are partially formed, influences the resistance to air-tightness of casting, there is this kind of technique and ask Topic is that die-cast product consistency is inadequate, and process is more, is not used by industry.Though another forging technology can obtain fine and close Product, due to production process complexity, among these include repeatedly forging and stamping and be mingled with it is therein heating, annealing etc. process, process work Sequence needs to reach 12 folders or more;So that forging cost is very high, usually more than ten times of die-cast product, while forging and pressing energy consumption pole Height can consume electric energy and water resource in large quantities, not meet environmentally protective requirement.
Summary of the invention
To solve the above-mentioned problems, the object of the present invention is to provide one kind can reduce cost 50%, efficiency improves 60%, while guaranteeing the preparation method of the mobile phone center of the consistency of product, rear cover.
The present invention is achieved through the following technical solutions:
The preparation method of a kind of mobile phone center, rear cover, first carries out melting die casting for alloy base material, the die casting that then will be obtained Part carries out forging and stamping one or twice, is then processed with CNC machine, finally post-process by the object after CNC is processed To the mobile phone center, rear cover.
Preferably, in the die casting process, alloy base material molten metal be under 15~100MPa pressure, with 10~50 meters/ The speed packed type chamber of second.
Preferably, in the die casting process, 610~650 DEG C of cast temperature.
Wherein, the forging and stamping process is to carry out isothermal forging with mechanical press;The blank temperature in entire forming process Keep constant value.Isothermal forging be in order to make full use of certain metals possessed high-ductility at a temperature of waiting one, or in order to Obtain specific tissue and performance.
In the forging and stamping process, mechanical press carries out the preceding heat treatment of vacuum forging, institute to workpiece before carrying out isothermal forging Stating temperature is 380~500 DEG C;Preferably applied metal be plastically deformed, improve workpiece mechanical performance (intensity, plasticity, toughness, Fatigue strength) and reliability.
Preferably, after the die casting workpiece thickness made allowance 15%~30%;Primarily to subsequent forging and stamping add Work.
Wherein, in the alloy material each ingredient mass percent are as follows: Cu 0.5~4.0%, Si 10.0~ 12.0%, Mg 0.02~0.3%, Zn≤0.1%, Fe≤1.3%, Mn≤0.5%, Ni≤0.5%, Sn≤0.35%, Al 3.0~11.5%.The performance requirement of alloy material: 193~296Mpa of shear strength, 395~700 DEG C of fusion temperature, tension is strong Spend 247~410Mpa, elongation percentage 5~25%.
Preferably, in the alloy material each ingredient mass percent are as follows: Al 8.9%~9.2%, Mn 0.19%~ 0.25%, Zn 0.65%~0.75%, Si 0.035%~0.05%, Cu 0.015%~0.025%, Ni < 0.002%, Fe < 0.003%, Be < 0.0015%, remaining Mg.The performance requirement of alloy material: tensile strength 230Mpa, yield strength 165Mpa prolong Stretch rate 3%, shear strength 140Mpa, fatigue strength 70Mpa, impact strength 2.2J, hardness 75BHN, young's modulus 45Gpa dives Hot 373KJ/KG.
Die-casting process of the present invention adds Forging Technology, and entire workpiece is made successively to undergo the place of die casting and forging and stamping completely completely Reason, in order to reach fine quality, cooperates the processing forged and pressed after entire die casting, needs to be screened on alloy material, while It optimizes, such as is reserved on workpiece after needing die casting for the ease of forging and stamping, while in Forging Technology in preparation method It is preceding that the preceding heat treatment of vacuum forging is carried out to workpiece.The present invention takes full advantage of high-efficient die-casting process, forming, can manufacture structure Complex Parts, advantage at low cost, in combination with forging and stamping to increase the density of the workpiece surface, make surface it is more regular it is fine and close from And subsequent appearance processing is made to can be realized better effect.It changes metal structure, improves metallicity.Workpiece is by hot forging After pressure, as cast condition originally is loose, hole, fine fisssure etc. are compacted or soldering;Dendrite originally is broken, makes crystal grains fine. The present invention use simultaneously mechanical press carry out isothermal forging and simultaneously forge and press before to workpiece carry out vacuum forging before heat, energy Change original carbide segregation and uneven distribution, make even tissue, to obtain internal closely knit, uniform, subtle, comprehensive It can be good.So that metal plastic flowing and the workpiece of required shape is made.Metal generates Plastic Flow by following rule after by external force: First is that constancy of volume is regular, in addition to the part cut off intentionally, remaining metal only has the transfer of mutual alignment, and total volume is constant;Two It is minimum drag rule, metal is always flowed to the smallest part of resistance.In production, often according to these rule control workpiece shapes Shape realizes the deformation such as jumping-up pulling, reaming, bending, drawing.Wherein, in order to reach the quality standards of final products, reach simultaneously More succinct smooth technique, reduces scrappage save the cost, cooperates production method of the present invention, to the constituent content of alloy Also there is certain requirement with physico-chemical property.
In short, workpiece size produced by the present invention is accurate, is conducive to tissue batch production, accurate size, the stabilization of forming. Efficient metal forming machinery and automatic stamping line can be used, organize specialized high-volume or mass production.Cost can be reduced 50%, efficiency improves 60%, while guaranteeing the consistency of product.
Specific embodiment
The present invention is described in further detail With reference to embodiment, to help those skilled in the art's reason The solution present invention.
Embodiment 1
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 15MPa pressure, with the speed packed type chamber of 50 meter per seconds, and die casting is carried out at 610 DEG C of cast temperature.Workpiece after die casting Thickness made allowance 15%~30%.Then it is forged and pressed, (temperature is for heat treatment before first carrying out vacuum forging to workpiece before forging and stamping 380℃);Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%-30% is forged It is depressed into product requirement thickness, forges and presses with emphasis on the outer surface of mobile phone center, rear cover, the mobile phone center, rear cover appearance is made with this The consistency in face greatly improves, convenient for subsequent surface treatment so that the mobile phone center, rear exterior surface meet appearance requirement, One to two folder techniques are needed to can be completed to make Forging Technology only, compared to the processing work that tradition forging and stamping need more than ten folders or more Skill greatly improves efficiency;Then workpiece is processed as requested with CNC machine, obtain target product mobile phone center, after Lid.
The mass percent of each ingredient is wherein required in alloy material are as follows: Cu 1.5~3.5%, Si 10.5~12.0%, Mg≤0.3%, Zn≤0.1%, Fe≤1.3%, Mn≤0.5%, Ni≤0.5%, Sn≤0.30%, Al surplus.Alloy material Performance requirement: tensile strength 296Mpa, yield strength 186Mpa, elongation percentage 2%, shear strength 196Mpa, the coefficient of expansion 21.0(10-6Degree-1), 625 DEG C of fusion temperature.
Embodiment 2
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 100MPa pressure, with the speed packed type chamber of 10 meter per seconds, and die casting is carried out at 650 DEG C of cast temperature.Workpiece after die casting Thickness stay and Yu 15%.Then it is forged and pressed, the preceding heat treatment of vacuum forging (temperature is 500 DEG C) first is carried out to workpiece before forging and stamping; Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%~30% is forged and pressed to production Product require thickness, forge and press with emphasis on the outer surface of mobile phone center, rear cover, the cause of the mobile phone center, rear exterior surface is made with this Density greatly improves, convenient for subsequent surface treatment so that the mobile phone center, rear exterior surface meet appearance requirement, to make Forging Technology only needs one to two folder techniques can be completed, compared to the treatment process that tradition forging and stamping need more than ten folders or more, significantly Improve efficiency;Then workpiece is processed with CNC machine as requested, obtains target product mobile phone center, rear cover.
The mass percent of each ingredient is wherein required in alloy material are as follows: Cu 3.0~4.5%, Si 10.5~12.0%, Mg≤0.1%, Zn≤0.1%, Fe≤1.3%, Mn≤0.5%, Ni≤0.5%, Sn≤0.35%, Al surplus.Alloy material Performance requirement: tensile strength 330Mpa, yield strength 165Mpa, elongation percentage 2.5%, shear strength 200Mpa, the coefficient of expansion 20.7(10-6Degree-1), 675 DEG C of fusion temperature.
Embodiment 3
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 50MPa pressure, with the speed packed type chamber of 20 meter per seconds, and die casting is carried out at 620 DEG C of cast temperature.Workpiece after die casting Thickness stay and Yu 20%.Then it is forged and pressed, the preceding heat treatment of vacuum forging (temperature is 450 DEG C) first is carried out to workpiece before forging and stamping; Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%~30% is forged and pressed to production Product require thickness, forge and press with emphasis on the outer surface of mobile phone center, rear cover, the cause of the mobile phone center, rear exterior surface is made with this Density greatly improves, convenient for subsequent surface treatment so that the cell phone rear cover outer surface meets appearance requirement, to make to forge and press Technique only needs one to two folder techniques can be completed, and compared to the treatment process that tradition forging and stamping need more than ten folders or more, greatly promotes Efficiency;Then workpiece is processed with CNC machine as requested, obtains target product mobile phone center, rear cover.
The mass percent of each ingredient is wherein required in alloy material are as follows: Cu 0.5~1.2%, Mg 0.02~0.03%, Zn surplus, Fe≤0.06%, Sn≤0.002%, Al 10.8~11.5%.The performance requirement of alloy material: tensile strength 404Mpa, yield strength 320Mpa, elongation percentage 5%, shear strength 296Mpa, the coefficient of expansion 24.1 (10-6Degree-1), fusion temperature 460~490 DEG C.
Embodiment 4
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 80MPa pressure, with the speed packed type chamber of 35 meter per seconds, and die casting is carried out at 620 DEG C of cast temperature.Workpiece after die casting Thickness stay and Yu 20%.Then it is forged and pressed, the preceding heat treatment of vacuum forging (temperature is 450 DEG C) first is carried out to workpiece before forging and stamping; Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%~30% is forged and pressed to production Product require thickness, forge and press with emphasis on the outer surface of mobile phone center, rear cover, the cause of the mobile phone center, rear exterior surface is made with this Density greatly improves, convenient for subsequent surface treatment so that the mobile phone center, rear exterior surface meet appearance requirement, to make Forging Technology only needs one to two folder techniques can be completed, compared to the treatment process that tradition forging and stamping need more than ten folders or more, significantly Improve efficiency;Then workpiece is processed with CNC machine as requested, obtains target product mobile phone center, rear cover.
The mass percent of each ingredient is wherein required in alloy material are as follows: Cu 0.75~1.25%, Mg 0.03~ 0.06%, Zn surplus, Fe≤0.75%, Sn≤0.001%, Al 3.9~4.3%.The performance requirement of alloy material: tension is strong Spend 292~335Mpa, elongation percentage 9~14%, shear strength 273Mpa, the coefficient of expansion 27 (10-6Degree-1), fusion temperature 395~ 425℃。
Embodiment 5
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 55MPa pressure, with the speed packed type chamber of 35 meter per seconds, and die casting is carried out at 640 DEG C of cast temperature.Workpiece after die casting Thickness stay and Yu 25%.Then it is forged and pressed, the preceding heat treatment of vacuum forging (temperature is 420 DEG C) first is carried out to workpiece before forging and stamping; Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%-30% is forged and pressed to production Product require thickness, forge and press with emphasis on the outer surface of mobile phone center, rear cover, the cause of the mobile phone center, rear exterior surface is made with this Density greatly improves, convenient for subsequent surface treatment so that the mobile phone center, rear exterior surface meet appearance requirement, to make Forging Technology only needs one to two folder techniques can be completed, compared to the treatment process that tradition forging and stamping need more than ten folders or more, significantly Improve efficiency;Then workpiece is processed with CNC machine as requested, obtains target product mobile phone center, rear cover.
The mass percent of each ingredient is wherein required in alloy material are as follows: Mg≤0.03%, Zn surplus, Al 3.9~ 4.3%.The performance requirement of alloy material: 247~286Mpa of tensile strength, elongation percentage 15~25%, shear strength 216Mpa are swollen Swollen coefficient 27 (10-6Degree-1), 395~425 DEG C of fusion temperature.
Embodiment 6
The preparation method of a kind of mobile phone center, rear cover: alloy base material is first subjected to die casting, is using alloy base material molten metal Under 80MPa pressure, with the speed packed type chamber of 30 meter per seconds, and die casting is carried out at 640 DEG C of cast temperature.Workpiece after die casting Thickness stay and Yu 25%.Then it is forged and pressed, the preceding heat treatment of vacuum forging (temperature is 420 DEG C) first is carried out to workpiece before forging and stamping; Then isothermal forging one or twice is carried out with mechanical press, the thickness surplus of the die casting 15%-30% is forged and pressed to production Product require thickness, forge and press with emphasis on the outer surface of mobile phone center, rear cover, the cause of the mobile phone center, rear exterior surface is made with this Density greatly improves, convenient for subsequent surface treatment so that the mobile phone center, rear exterior surface meet appearance requirement, to make Forging Technology only needs one to two folder techniques can be completed, compared to the treatment process that tradition forging and stamping need more than ten folders or more, significantly Improve efficiency;Then workpiece is processed with CNC machine as requested, obtains target product mobile phone center, rear cover.
Wherein alloy material is magnesium alloy, the mass percent of ingredient are as follows: Al 8.9%~9.2%, Mn 0.19% ~0.25%, Zn 0.65%~0.75%, Si 0.035%~0.05%, Cu 0.015%~0.025%, Ni < 0.002%, Fe < 0.003%, Be < 0.0015%, remaining Mg.The performance requirement of alloy material: tensile strength 230Mpa, yield strength 165Mpa, Elongation percentage 3%, shear strength 140Mpa, fatigue strength 70Mpa, impact strength 2.2J, hardness 75BHN, young's modulus 45Gpa, Latent heat 373KJ/KG.

Claims (1)

1. the preparation method of a kind of mobile phone center, rear cover, which is characterized in that alloy base material is first carried out melting die casting, then will Obtained die casting carries out forging and stamping one or twice, is then processed with CNC machine, finally by the object after CNC is processed into Row post-processing, obtains the mobile phone center, rear cover;
The mass percent of each ingredient in the alloy base material are as follows: Cu 0.5~4.0%, Si 10.0~12.0%, Mg 0.02 ~0.3%, Zn≤0.1%, Fe≤1.3%, Mn≤0.5%, Ni≤0.5%, Sn≤0.35%, Al 3.0~11.5%,
The forging and stamping process is carries out isothermal forging with mechanical press, in the forging and stamping process, mechanical press progress isothermal The preceding heat treatment of vacuum forging is carried out to workpiece before forging and stamping, the temperature is 380~500 DEG C;
Alloy base material molten metal is under 15~100MPa pressure, with the speed packed type chamber of 10~50 meter per seconds, the die carter In sequence, 610~650 DEG C of cast temperature, the thickness made allowance 15%-30% of workpiece, the property of the alloy base material after the die casting It can require: 193~296Mpa of shear strength, 395~700 DEG C of fusion temperature, 247~410Mpa of tensile strength, elongation percentage 5~ 25%.
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CN201410264957.7A CN104015009B (en) 2014-06-13 2014-06-13 A kind of mobile phone center, the preparation method of bonnet

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