CN107148199B - Heat-conducting graphite gasket and preparation method thereof - Google Patents
Heat-conducting graphite gasket and preparation method thereof Download PDFInfo
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- CN107148199B CN107148199B CN201710442971.5A CN201710442971A CN107148199B CN 107148199 B CN107148199 B CN 107148199B CN 201710442971 A CN201710442971 A CN 201710442971A CN 107148199 B CN107148199 B CN 107148199B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a heat-conducting graphite gasket and a preparation method thereof, comprising the following steps: a plurality of single-specification or multi-specification graphite gaskets arranged at intervals along the horizontal direction, wherein the lower surface of each graphite gasket is coated with a silica gel layer; a release film is adhered to the lower surface of the graphite gasket; the upper surface of the graphite gasket is coated with a low-viscosity protective film. The heat-conducting graphite gasket is convenient to use and beneficial to improving the assembly work efficiency. The preparation method of the heat-conducting graphite gasket can effectively avoid adhesion between adjacent formed graphite gaskets, and has high processing precision and high material utilization rate.
Description
Technical Field
The invention relates to the technical field of manufacturing of graphite gaskets, in particular to a heat-conducting graphite gasket and a preparation method thereof.
Background
In recent years, with the continuous development of electronic technology, electronic products are continuously updated, the size of working components is smaller and smaller, the working speed and efficiency are higher and the heating value is larger and larger, so that the electronic products are required to be provided with corresponding heat dissipation devices, the heat dissipation devices are ensured to have stronger heat dissipation capability, the reliability of the performance of the products is ensured, and the service life of the products is prolonged.
Graphite is used as a heat conduction and radiation material, and is a preferred material for solving the heat conduction and radiation technology of modern electronic products due to the special low density (relative to metals), high heat conduction and radiation coefficient and low thermal resistance. The graphite radiating fin not only can conduct heat horizontally, but also can conduct heat vertically, and especially, the lamellar structure is utilized, so that the graphite radiating fin is not only better applicable to the surface of any product, but also can effectively conduct heat and dissipate heat.
When the existing graphite gaskets are manufactured, the graphite gaskets are processed by a vertical working procedure after being processed by a transverse working procedure of a cutter, or the graphite gaskets are formed by stamping the graphite gaskets by an AB combined die, so that a plurality of graphite gaskets are formed. When in use, the graphite gaskets are stuck on the electronic components one by one. However, there are the following problems:
1. when the cutter is adopted for processing, the processed graphite gaskets have no space, the adjacent graphite gaskets are easy to adhere, and the use of customers is inconvenient.
2. When the AB combined die is used for forming, the die sleeve position precision is poor, the material utilization rate is low, the leftover materials are wasted much, and the size of the processed product cannot meet the size requirement of a more precise electronic product.
3. When the graphite gasket is used, the graphite gaskets are required to be stuck on the electronic components one by one, and the assembly work efficiency is low.
Disclosure of Invention
The invention aims to provide a heat-conducting graphite gasket which is convenient to use and beneficial to improving the assembly work efficiency.
The invention further aims to provide a preparation method of the heat-conducting graphite gasket, which can effectively avoid adhesion between adjacent formed graphite gaskets, and has high processing precision and high material utilization rate.
To achieve the purpose, the invention adopts the following technical scheme:
a thermally conductive graphite gasket comprising: a plurality of single-specification or multi-specification graphite gaskets arranged at intervals along the horizontal direction, wherein the lower surface of each graphite gasket is coated with a silica gel layer; a release film is adhered to the lower surface of the graphite gasket; the upper surface of the graphite gasket is coated with a low-viscosity protective film.
As a further improvement of the invention, the release film is a PET grid film; the thickness of the release film is 0.05 mm-0.15 mm.
As a further improvement of the present invention, the low-viscosity protective film is a low-viscosity PET protective film; the thickness of the low-viscosity protective film is 0.1 mm-0.15 mm.
As a further improvement of the invention, the thickness of the graphite gasket is 3.0 mm-5.0 mm.
A preparation method of a heat-conducting graphite gasket comprises the following steps:
step A: blanking, and preparing a release film and a low-viscosity protective film;
and (B) step (B): stamping forming, namely stamping forming the graphite material sheet by using stamping forming equipment with a plurality of cavity punches and an upper die for installing the cavity punches, forming a plurality of graphite gaskets with single specifications or multiple specifications, and enabling each stamped graphite gasket to enter a cavity of the corresponding cavity punch;
step C: adopt the liftout device that has a plurality of liftout poles and is located the limiting plate of the top of a plurality of liftout poles to carry out the roof pressure to graphite gasket: placing a low-viscosity protective film between a material pushing rod and a limiting plate, enabling the material pushing rod to extend into a cavity of a cavity punch corresponding to the material pushing rod to push out the graphite gasket, and bonding the graphite gasket and the low-viscosity protective film by matching with the limiting plate to form a heat-conducting graphite gasket semi-finished product;
step D: and taking out the semi-finished product of the heat-conducting graphite gasket, and attaching a release film on the upper surface of the graphite gasket to obtain the heat-conducting graphite gasket.
As a further improvement of the invention, in the step B, when the graphite sheet is placed, the upper surface of the graphite sheet with the silica gel layer is adhered to the knife edge surface of the cavity punch.
As a further improvement of the invention, in the step A, when the release film and the low-viscosity protective film are prepared by adopting punching equipment, a layer of transparent protective film with the thickness of 0.075mm and the weight of 30g is respectively attached to the non-product contact surface of the release film and the low-viscosity protective film.
The beneficial effects of the invention are as follows: the invention provides a heat-conducting graphite gasket, which comprises a plurality of graphite gaskets with single specification or multiple specifications, wherein the graphite gaskets are arranged at intervals along the horizontal direction, and the lower surface of each graphite gasket is coated with a silica gel layer; a release film is adhered to the lower surface of the graphite gasket; the upper surface of the graphite gasket is coated with a low-viscosity protective film. When in use, the release film is removed, a plurality of graphite gaskets are adhered to the electronic components through the silica gel layer, and then the low-viscosity protective film is removed. Compared with the prior art that graphite gaskets are bonded one by one, the heat-conducting graphite gasket is convenient to use, and the assembly work efficiency is greatly improved. According to the preparation method of the heat-conducting graphite gasket, provided by the invention, the graphite material sheet is subjected to stamping forming by adopting stamping forming equipment with a plurality of cavity punches, a plurality of graphite gaskets with single specification or multiple specifications are formed at one time, and the formed graphite gaskets respectively enter the cavities of the corresponding cavity punches; the ejection rod of the ejection device stretches into the cavity of the cavity punch corresponding to the ejection rod to eject the graphite gasket, the ejection rod is matched with the limiting plate to eject the graphite gasket to be bonded with the low-viscosity protective film to form a heat-conducting graphite gasket semi-finished product, the heat-conducting graphite gasket semi-finished product is finally taken out, and the release film is attached to the upper surface of the graphite gasket of the heat-conducting graphite gasket semi-finished product, so that the heat-conducting graphite gasket is obtained. The method can effectively avoid adhesion between the adjacent formed graphite gaskets, and the graphite gaskets have high processing precision and high material utilization rate.
Drawings
FIG. 1 is a schematic diagram of a thermally conductive graphite gasket according to the present invention;
FIG. 2 is a schematic diagram of a heat conductive graphite gasket according to the present invention in step B;
fig. 3 is a schematic processing diagram of the heat-conducting graphite gasket in the step C according to the present invention.
In the figure: 1-a low-viscosity protective film; 2-graphite flakes; 21-graphite gaskets; 3-release film; 4-upper die; 41-cavity punch; 5-lower die; 6-a material ejection device; 61-ejector pins.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 3, a thermally conductive graphite gasket, comprising: a plurality of single-specification or multi-specification graphite gaskets 21 arranged at intervals along the horizontal direction, the lower surface of each graphite gasket 21 being coated with a silica gel layer; the lower surface of the graphite gasket 21 is adhered with a release film 3; the upper surface of the graphite gasket 21 is coated with a low-viscosity protective film 1.
When the heat-conducting graphite gasket provided by the invention is used, the release film 3 is firstly removed, then a plurality of graphite gaskets are adhered to the electronic components through the silica gel layer on the lower surface of the release film, and then the low-viscosity protective film 1 is removed, so that the assembly of the graphite gaskets on the electronic components is realized, the heat-conducting graphite gasket is more convenient to use, and the assembly working efficiency is greatly improved.
As a further improvement of the present invention, the release film 3 is a blue PET mesh film; the grid film is adopted to reduce the contact area between the grid film and the graphite gasket, so that the grid film is torn off from the graphite gasket when the graphite gasket is convenient to use. The thickness of the release film 3 is 0.05 mm-0.15 mm.
As a further improvement of the present invention, the low-adhesion protective film 1 is a blue PET protective film; the thickness of the low-viscosity protective film 1 is 0.1mm to 0.15mm.
In the above-mentioned thermally conductive graphite gasket, the graphite gasket 21 includes a graphite base material and a silica gel layer coated on the upper surface of the graphite base material. Wherein, the thickness of the graphite gasket 21 is 3.0 mm-5.0 mm, and the thickness of the silica gel layer is 0.05 mm-0.1 mm.
A preparation method of a heat-conducting graphite gasket comprises the following steps:
step A: blanking, and preparing a release film 3 and a low-viscosity protective film 1;
and (B) step (B): the graphite sheet 2 is press-formed by a press forming apparatus having a plurality of cavity punches 41, an upper die 4 for mounting the plurality of cavity punches 41, and a lower die 5, and a plurality of single-gauge or multi-gauge graphite shims 21 are formed. Wherein a plurality of cavity punches 41 are mounted to the lower surface of the upper die 4 of the press forming apparatus. The graphite gasket 21 formed by punching enters the cavity of the cavity punch 41 corresponding to the graphite gasket; in particular, when the graphite sheet 2 is placed, the upper surface of the graphite sheet 2 having the silica gel layer is stuck to the edge surface of the cavity punch 41, so as to fix the graphite sheet 2, and prevent the graphite sheet 2 from moving during press forming to affect the machining accuracy of the formed graphite gasket.
Step C: the graphite gasket 21 is subjected to constant pressure by using a ejector 6 having a plurality of ejector pins 61 and a stopper plate located above the plurality of ejector pins 61: the upper die 4 in the step B is movably mounted on the material ejection device 6, wherein one material ejection rod 61 of the material ejection device 6 can be correspondingly inserted into a cavity of one cavity punch 41; the low-viscosity protective film 1 is placed between the top end of the ejector rod 61 and the limiting plate, the ejector rod 61 is driven by the driving device to extend into the cavity of the cavity punch 41 corresponding to the ejector rod to eject the graphite gasket 21, and the ejector rod is matched with the limiting plate to eject the graphite gasket 21 to be bonded with the low-viscosity protective film 3, so that a heat-conducting graphite gasket semi-finished product is formed; wherein the driving device is an air cylinder or a hydraulic cylinder.
Step D: and taking out the semi-finished product of the heat-conducting graphite gasket from the material ejection device 6, and attaching a release film 3 on the upper surface of the graphite gasket 21 to obtain the heat-conducting graphite gasket.
As a further improvement of the invention, in the step A, when the release film 3 and the low-viscosity protective film 1 are prepared by adopting punching equipment, a layer of transparent protective film with the thickness of 0.075mm and the weight of 30g is respectively attached to the non-product contact surface of the release film 3 and the low-viscosity protective film 1 so as to protect the surfaces of the release film 3 and the low-viscosity protective film 1.
The preparation method of the heat-conducting graphite gasket provided by the invention can effectively avoid adhesion between adjacent formed graphite gaskets, and has the advantages of high processing precision, high forming efficiency and high material utilization rate of the graphite gaskets.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. The preparation method of the heat-conducting graphite gasket is used for preparing the heat-conducting graphite gasket, and the heat-conducting graphite gasket comprises a plurality of single-specification or multi-specification graphite gaskets (21) which are arranged at intervals along the horizontal direction, wherein the lower surface of each graphite gasket (21) is coated with a silica gel layer; a release film (3) is adhered to the lower surface of the graphite gasket (21); the upper surface of the graphite gasket (21) is stuck with a low-viscosity protective film (1);
the preparation method of the heat-conducting graphite gasket is characterized by comprising the following steps of:
step A: discharging, and preparing a release film (3) and a low-viscosity protective film (1);
and (B) step (B): stamping forming, namely stamping forming the graphite material sheet (2) by using stamping forming equipment with a plurality of cavity punches (41) and an upper die (4) for installing the plurality of cavity punches (41), forming a plurality of single-specification or multi-specification graphite gaskets (21), and enabling each stamped graphite gasket (21) to enter a cavity of the corresponding cavity punch (41);
step C: the graphite gasket (21) is jacked by adopting a jacking device (6) with a plurality of jacking rods (61) and limiting plates positioned above the jacking rods (61): the low-viscosity protective film (1) is placed between the ejector rod (61) and the limiting plate, the ejector rod (61) stretches into a cavity of the cavity punch (41) corresponding to the ejector rod to eject the graphite gasket (21), and the graphite gasket (21) is pressed to be bonded with the low-viscosity protective film (1) through matching with the limiting plate, so that a heat-conducting graphite gasket semi-finished product is formed;
step D: and taking out the semi-finished product of the heat-conducting graphite gasket, and attaching a release film (3) on the upper surface of the graphite gasket (21) to obtain the heat-conducting graphite gasket.
2. The method for preparing the heat-conducting graphite gasket according to claim 1, wherein the release film (3) is a PET grid film; the thickness of the release film (3) is 0.05 mm-0.15 mm.
3. The method for preparing the heat-conducting graphite gasket according to claim 1, wherein the low-viscosity protective film (1) is a low-viscosity PET protective film; the thickness of the low-viscosity protective film (1) is 0.1 mm-0.15 mm.
4. The method for preparing a thermally conductive graphite gasket according to claim 1, characterized in that the thickness of the graphite gasket (21) is 3.0mm to 5.0mm.
5. The method for preparing a thermally conductive graphite gasket according to claim 1, wherein in the step B, when the graphite sheet (2) is placed, the upper surface of the graphite sheet (2) having the silica gel layer is adhered to the knife edge surface of the cavity punch (41).
6. The method for preparing the heat-conducting graphite gasket according to claim 1, wherein in the step a, when the release film (3) and the low-viscosity protective film (1) are prepared by using punching equipment, a transparent protective film with the thickness of 0.075mm and the weight of 30g is respectively attached to the non-product contact surfaces of the release film (3) and the low-viscosity protective film (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442971.5A CN107148199B (en) | 2017-06-13 | 2017-06-13 | Heat-conducting graphite gasket and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442971.5A CN107148199B (en) | 2017-06-13 | 2017-06-13 | Heat-conducting graphite gasket and preparation method thereof |
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| Publication Number | Publication Date |
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| CN107148199A CN107148199A (en) | 2017-09-08 |
| CN107148199B true CN107148199B (en) | 2023-07-07 |
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| CN201710442971.5A Active CN107148199B (en) | 2017-06-13 | 2017-06-13 | Heat-conducting graphite gasket and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110696194B (en) * | 2019-10-16 | 2021-07-23 | 山东微滕新材料科技有限公司 | Punching and forming method for producing graphite composite gasket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015064519A1 (en) * | 2013-11-01 | 2015-05-07 | 東レ・デュポン株式会社 | Graphite laminate |
| CN205902315U (en) * | 2016-08-12 | 2017-01-18 | 深圳市津田电子有限公司 | Compound graphite radiating sheet |
| CN206237724U (en) * | 2016-11-13 | 2017-06-09 | 沈开湘 | A kind of radiator structure for electronic component |
| CN206977895U (en) * | 2017-06-13 | 2018-02-06 | 昆山市飞荣达电子材料有限公司 | A kind of conductive graphite pad |
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Effective date of registration: 20230607 Address after: 213200 No.139 Huaye Road, Jintan District, Changzhou City, Jiangsu Province Applicant after: Feirongda Technology (Jiangsu) Co.,Ltd. Address before: No. 258, Dongping Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, 215311 Applicant before: KUNSHAN FEIRONGDA ELECTRONIC MATERIAL Co.,Ltd. |
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