KR20170010618A - Method of manufacturing mobile phone frames using vacuum die-casting process - Google Patents

Method of manufacturing mobile phone frames using vacuum die-casting process Download PDF

Info

Publication number
KR20170010618A
KR20170010618A KR1020150102488A KR20150102488A KR20170010618A KR 20170010618 A KR20170010618 A KR 20170010618A KR 1020150102488 A KR1020150102488 A KR 1020150102488A KR 20150102488 A KR20150102488 A KR 20150102488A KR 20170010618 A KR20170010618 A KR 20170010618A
Authority
KR
South Korea
Prior art keywords
frame
cavity
mobile phone
molten aluminum
casting
Prior art date
Application number
KR1020150102488A
Other languages
Korean (ko)
Inventor
김권희
Original Assignee
고려대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 고려대학교 산학협력단 filed Critical 고려대학교 산학협력단
Priority to KR1020150102488A priority Critical patent/KR20170010618A/en
Publication of KR20170010618A publication Critical patent/KR20170010618A/en

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14Machines with evacuated die cavity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04Casting aluminium or magnesium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/033Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/0202Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets

Abstract

According to a method of manufacturing a mobile phone frame, the method prepares molten aluminum and charges the molten aluminum into a cavity in a condition where gas inside the cavity of a mold is forcibly discharged to the outside using a vacuum pump. Afterwards, the present invention enables the molten aluminum to be solidified while maintaining a predetermined vacuum level inside the cavity to form a mobile phone frame. Then, the frame is separated from the cavity, wherein a polishing process which polishes a surface of the frame is able to additionally be performed.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a mobile phone frame using a vacuum die casting process,
The present invention relates to a method of manufacturing a mobile phone frame using a vacuum die casting process, and more particularly, to a method of manufacturing a mobile phone frame using a vacuum die casting process capable of suppressing the generation of bubbles by controlling vacuum.
Mobile phone frames made of aluminum are used. Aluminum is lightweight, easy to mold, has better impact resistance than plastic materials, and has electromagnetic wave shielding properties.
Methods for producing corrosion-resistant, abrasion-resistant and various colors by anodizing a surface of a rolled material or a plate using an aluminum alloy are well known.
However, manufacturing of a mobile phone frame using an aluminum alloy requires a separate process such as machining in order to realize a complicated and precise shape of a frame including a fastening part with an interior material, so that it can be economically realized not.
In order to minimize the machining process, attempts have been made to manufacture a preform of a frame by die casting at a time. Die casting is a kind of casting technology for casting a molten aluminum alloy casting casting into a mold having a predetermined shape to form bubbles inside or on the surface of the casting aluminum alloy during coagulation to lower the strength and uneven surface texture .
It is an object of the present invention to provide a method of manufacturing a mobile phone frame using a vacuum die casting process capable of realizing uniformity of strength and surface texture.
According to another aspect of the present invention, there is provided a method of manufacturing a mobile phone frame, comprising the steps of: preparing molten aluminum; injecting molten aluminum into the cavity in a state where a gas in the cavity of the mold is discharged; Charge. Thereafter, the molten aluminum is solidified in the cavity to form a frame of the mobile phone. Thereafter, the frame is released from the cavity.
In one embodiment of the present invention, a polishing process for polishing the surface of the frame may be additionally performed.
In one embodiment of the present invention, when charging molten aluminum into the cavity, a vacuum process in the cavity may be performed using a vacuum pump connected to the cavity.
According to the method of manufacturing a mobile phone frame according to the embodiments of the present invention, a die casting process for manufacturing a frame in a vacuum state of a cavity is performed. Therefore, it is possible to suppress the generation of residual bubbles in the frame and to increase the strength thereof. Furthermore, the uniformity of the surface texture of the frame can be realized.
1 is a photograph showing a mobile phone frame manufactured by a method of manufacturing a mobile phone frame according to an embodiment of the present invention.
2 is a photomicrograph showing the surface of the mobile phone frame of Fig.
3 is a photomicrograph showing the surface of a mobile phone frame formed through a general die casting process (comparative example).
Hereinafter, embodiments of the present invention will be described in detail. The present invention can take various forms and can take various forms. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprise", "comprising", and the like are intended to specify that there is a feature, step, function, element, or combination of features disclosed in the specification, Quot; or " an " or < / RTI > combinations thereof.
On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Manufacturing method of mobile phone frame
In the method of manufacturing a mobile phone frame according to an embodiment of the present invention, molten aluminum is prepared. The aluminum can be melted at a melting point temperature of 660 ° C or higher. Also, the melting point temperature may be changed according to an element included in the aluminum.
Then, the molten aluminum is charged into the cavity while the gas in the cavity of the mold is discharged. That is, by evacuating the inside of the cavity, the cavity that can remain in the solidification of the molten aluminum can be removed. Thus, the solidified frame can have an improved structure and a uniform surface. In addition, since the cavity is evacuated, the molten aluminum can be charged into the cavity more easily.
A venting block may be formed in the cavity to evacuate the cavity. In this case, the cavity may be evacuated by connecting a vacuum pump to the cavity via the venting block.
 The molten aluminum is then solidified in the cavity to form a frame of the mobile phone. At this time, since the inside of the cavity is evacuated, formation of pores in the frame is suppressed, and further, the surface of the frame can be uniform.
Thereafter, the frame is released from the cavity. The process of releasing the frame may be performed using, for example, an eject pin provided to pass through the cavity. That is, the frame can be released from the cavity by ejecting pins through the cavity and contacting the frame formed in the cavity.
In the vacuum die casting process according to the present invention, a frame of a mobile phone can be manufactured by pouring molten metal into a mold having a predetermined shape. That is, the frame can be easily manufactured in a single process as compared with the conventional forging process.
The molten aluminum used in the vacuum die casting process comprises a silicon component. The silicon contained in the molten aluminum may be contained in a proportion of 10 to 20% by weight. The molten aluminum containing silicon may have improved flowability and entrainment properties.
In one embodiment of the present invention, a step of polishing the surface of the frame may be additionally performed. The polishing process may remove surface oxides, foreign substances, and the like of the frame formed by the vacuum die casting process. Further, polish polishing by sandblasting, hair line, buffing or the like can be performed depending on the required surface texture.
1 is a photograph showing a mobile phone frame manufactured by a method of manufacturing a mobile phone frame according to an embodiment of the present invention. 2 is a photomicrograph showing the surface of the mobile phone frame of Fig. In the case of Fig. 2, the surface of the mobile phone frame is photographed at 100 magnification.
Referring to FIGS. 1 and 2, it can be seen that the mobile phone frame formed through the vacuum die casting process has a uniform surface.
3 is a photomicrograph showing the surface of a mobile phone frame formed through a general die casting process (comparative example). 3 is a photograph of the surface of the mobile phone frame taken at 200 magnifications.
Referring to FIG. 3, it can be seen that bubbles remain on the surface of the mobile phone frame formed through the general die casting process.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.
Embodiments of the present invention can be applied to a frame of a mobile phone made of aluminum. Furthermore, this technology can be applied to a frame of a mobile electronic device including a mobile phone.

Claims (3)

  1. Preparing molten aluminum;
    Charging the molten aluminum into the cavity with the gas in the cavity of the mold being discharged;
    Solidifying the molten aluminum within the cavity to form a frame of the mobile phone; And
    And releasing the frame from the cavity.
  2. The method of claim 1, further comprising polishing the surface of the frame.
  3. The method of claim 1, wherein charging the molten aluminum into the cavity is performed using a vacuum pump connected to the cavity.
KR1020150102488A 2015-07-20 2015-07-20 Method of manufacturing mobile phone frames using vacuum die-casting process KR20170010618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150102488A KR20170010618A (en) 2015-07-20 2015-07-20 Method of manufacturing mobile phone frames using vacuum die-casting process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150102488A KR20170010618A (en) 2015-07-20 2015-07-20 Method of manufacturing mobile phone frames using vacuum die-casting process

Publications (1)

Publication Number Publication Date
KR20170010618A true KR20170010618A (en) 2017-02-01

Family

ID=58109368

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150102488A KR20170010618A (en) 2015-07-20 2015-07-20 Method of manufacturing mobile phone frames using vacuum die-casting process

Country Status (1)

Country Link
KR (1) KR20170010618A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108901154A (en) * 2018-06-29 2018-11-27 Oppo广东移动通信有限公司 Center production method, center and electronic device
WO2019022558A1 (en) * 2017-07-27 2019-01-31 (주)케이에이치바텍 Method for manufacturing frame structure for portable terminal
KR20190013394A (en) * 2017-07-27 2019-02-11 주식회사 케이에이치바텍 Manufacturing method of frame structure for portable device
CN110071989A (en) * 2019-03-27 2019-07-30 中山市优绿智得数码科技有限公司 A kind of printing manufacturing process being exclusively used in cell phone rear cover

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019022558A1 (en) * 2017-07-27 2019-01-31 (주)케이에이치바텍 Method for manufacturing frame structure for portable terminal
KR20190013394A (en) * 2017-07-27 2019-02-11 주식회사 케이에이치바텍 Manufacturing method of frame structure for portable device
CN108901154A (en) * 2018-06-29 2018-11-27 Oppo广东移动通信有限公司 Center production method, center and electronic device
CN108901154B (en) * 2018-06-29 2020-06-30 Oppo广东移动通信有限公司 Middle frame manufacturing method, middle frame and electronic device
CN110071989A (en) * 2019-03-27 2019-07-30 中山市优绿智得数码科技有限公司 A kind of printing manufacturing process being exclusively used in cell phone rear cover

Similar Documents

Publication Publication Date Title
KR101888571B1 (en) Method of manufacturing middle frame for mobile electronic device and middle frame for mobile electronic device
CN103990775B (en) Extruding metal autoform method and its product
EP1711291B1 (en) Cylinder liner for insert casting
TWI467025B (en) Aluminum alloys, aluminum alloy products and methods for making the same
JP5417557B2 (en) Internal gear manufacturing method
KR100944130B1 (en) Semi-solid molding method
CN103298962B (en) For the aluminium alloy of die casting
CN106735186B (en) A kind of method that 3D printing-isostatic cool pressing prepares titanium alloy multi-stage gear
JP6284048B2 (en) Semi-solid molten cast forging method
CN101927329B (en) Vacuum high-pressure casting method
JP2019502028A5 (en)
CN104726756B (en) High-performance beryllium-aluminum alloy and preparing method thereof
WO2016045534A1 (en) Die-casting process method for die-cast molding of metal in semi-solid state
JP4224024B2 (en) Vacuum die casting method and apparatus for aluminum alloy and aluminum alloy product
CN104439158B (en) Use the method and apparatus of casting and forming tool production metal parts
JP4693772B2 (en) Metal glass forming method
Chung et al. A study on semisolid processing of A356 aluminum alloy through vacuum-assisted electromagnetic stirring
JP2519416B2 (en) Die casting method and die casting equipment
CN109482813B (en) WCp/EPS lost foam pattern and WCp/Fe composite material preparation
CN103567384B (en) The method for manufacturing rotor
CN105063438B (en) A kind of preparation method of high copper silicon magnesium system POWDER METALLURGY ALUMINIUM ALLOYS
JP6495246B2 (en) Aluminum alloy and die casting method
US9004147B2 (en) Method and apparatus for press casting
CN109175350B (en) Al-Mg-Mn-Sc-Zr aluminum alloy powder for additive manufacturing and preparation method thereof
CN105121682B (en) R-T-B series magnets raw alloy and its manufacture method