CN109952001B - Double-sided friction stir welding cold plate and processing method thereof - Google Patents
Double-sided friction stir welding cold plate and processing method thereof Download PDFInfo
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- CN109952001B CN109952001B CN201910257420.0A CN201910257420A CN109952001B CN 109952001 B CN109952001 B CN 109952001B CN 201910257420 A CN201910257420 A CN 201910257420A CN 109952001 B CN109952001 B CN 109952001B
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- 238000003466 welding Methods 0.000 title claims abstract description 104
- 238000003756 stirring Methods 0.000 title claims abstract description 53
- 238000003672 processing method Methods 0.000 title abstract description 13
- 230000017525 heat dissipation Effects 0.000 claims abstract description 90
- 239000000758 substrate Substances 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 18
- 230000003749 cleanliness Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Pressure Welding/Diffusion-Bonding (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention relates to the technical field of heat dissipation equipment, in particular to a double-sided friction stir welding cold plate and a processing method thereof. According to the double-sided friction stir welding cold plate, the circulation ports are formed in the peripheral side face of the substrate, the upper flow channels and the lower flow channels are formed in the upper side face and the lower side face of the substrate, the upper flow channels are arranged at intervals and are not communicated with each other, the lower flow channels are arranged at intervals and are not communicated with each other, only the upper flow channels and the lower flow channels are vertically communicated, and the complexity of a process is reduced; in addition, the apron corresponds the setting with the runner, and the apron welds with the base plate welding through friction stir welding and shaping, can prevent effectively that the welding bits from getting into the runner, guarantees the cleanliness of runner, improves the radiating effect. The processing method is used for processing the double-sided friction stir welding cold plate, has a simple processing technology, can reduce impurities in a runner, and improves the heat dissipation effect.
Description
Technical Field
The invention relates to the technical field of heat dissipation equipment, in particular to a double-sided friction stir welding cold plate and a processing method thereof.
Background
The cold plate is a single fluid (gas or liquid) heat exchanger, and plays roles in heat dissipation and cooling through the circulation flow of the fluid. The cold plate is usually made of aluminum alloy or copper alloy materials, has the characteristics of high heat dissipation efficiency, small temperature gradient and the like, has wide application prospect in the fields of power electronics, aerospace, ships and the like, and is an ideal heat dissipation element of various high-power electronic equipment. In the electronic industry, electronic fluoride liquid is generally used for heat dissipation of chips as a circulation medium in the cold plate, and the requirement on the cleanliness of the cold plate is high, so that the structure of the cold plate needs to be specially designed. The cold plate typically includes a base plate and a cover plate, the flow channel layout is designed on the base plate, and then the cover plate is fixed above the flow channels to seal the flow channels and prevent leakage of the cooling liquid.
At present, the welding mode of the cold plate base plate and the cover plate generally adopts the processes of vacuum brazing, soldering, flame welding and the like, so that a large amount of welding impurities are easily caused in the cold plate flow passage, and the heat dissipation effect is poor. The welding seam of friction stir welding is not contacted with the runner, and welding impurities cannot remain in the runner by friction stir welding. However, in friction stir welding, since the size of the cover plate is large relative to the corresponding runner size, the arrangement of the runners in the cold plate is greatly limited by the welding process, thereby increasing the complexity of the processing process.
Accordingly, there is a need for a dual-sided friction stir welding cold plate and a method of processing the same to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a double-sided friction stir welding cold plate which can reduce impurities in a runner, improve the heat dissipation effect, is convenient to process and has a simple processing technology.
The invention further aims to provide a processing method of the double-sided friction stir welding cold plate, which is used for processing the double-sided friction stir welding cold plate, has a simple processing technology, can reduce impurities in a runner and improves the heat dissipation effect.
In order to achieve the above object, the following technical scheme is provided:
the double-sided friction stir welding cold plate comprises a substrate and a cover plate, wherein a circulation port and a runner are arranged on the substrate, the runner is divided into an upper runner arranged on the upper side surface of the substrate at intervals and a lower runner arranged on the lower side surface of the substrate at intervals, and the lower runner is communicated with the upper runner so that cold flow medium enters from one circulation port and sequentially and alternately flows through the upper runner and the lower runner and flows out from the other circulation port;
and at least two cover plates and the base plate are welded and formed through friction stir welding.
Further, the upper flow channel comprises an upper heat dissipation area flow channel, and upper heat dissipation fins are arranged on the cover plate corresponding to the upper heat dissipation area flow channel; and/or
The lower flow channel comprises a lower heat dissipation area flow channel, and a lower heat dissipation fin is arranged on the cover plate corresponding to the lower heat dissipation area flow channel.
Further, the depth value of the upper heat dissipation area flow channel is larger than the fin height value of the upper heat dissipation fin; and/or
The depth value of the flow channel of the lower heat dissipation area is larger than the fin height value of the lower heat dissipation fin.
Further, on one side of the substrate, each runner is correspondingly provided with one cover plate, and at least two adjacent cover plates are connected into a whole.
Further, the upper runner further comprises an upper main runner, and the cover plate of the upper heat dissipation area runner is integrally formed with the cover plates of the upper main runners adjacent to two sides of the cover plate.
Further, the lower runner further comprises a lower main runner, and the cover plates of the two lower heat dissipation area runners and the cover plates of the two lower main runners arranged in the middle of the lower main runner are integrally formed.
A processing method of a double-sided friction stir welding cold plate comprises the following steps:
processing a circulation port: processing the flow port on the peripheral side surface of the substrate;
processing a flow passage: processing a plurality of upper runners which are arranged at intervals on the upper side surface of the substrate, and processing a plurality of lower runners which are arranged at intervals on the lower side surface of the substrate, wherein the lower runners are communicated with the upper runners so that cold flow medium enters from one circulation port, alternately flows through the upper runners and the lower runners in sequence and flows out from the other circulation port;
processing a cover plate: designing and processing a cover plate matched with the flow channel according to the shape of the flow channel;
welding and forming: and welding the cover plate and the base plate by adopting friction welding to obtain the double-sided friction stir welding cold plate.
Further, in the welding molding step, the cover plate and the base plate are welded along edges of the cover plate.
Further, the welding forming step further includes:
at least partially welding the cover plate and the base plate for the second time at the interval area between the upper runners; or/and (or)
And at least partially welding the cover plate and the base plate for the second time at the interval area between the lower runners.
Further, after the welding forming step, the method further comprises: and (3) surface treatment, namely finishing the flatness of the double-sided friction stir welding cold plate by adopting a fly cutting process.
Compared with the prior art, the invention has the beneficial effects that:
according to the double-sided friction stir welding cold plate, the circulating ports are formed in the peripheral side face of the substrate, the upper flow channels and the lower flow channels are formed in the upper side face and the lower side face of the substrate, the upper flow channels are arranged at intervals and are not communicated with each other, the lower flow channels are arranged at intervals and are not communicated with each other, only the upper flow channels and the lower flow channels are communicated with each other up and down, and the complexity of a process is reduced; in addition, the apron corresponds the setting with the runner, and the apron welds with the base plate welding through friction stir welding and shaping, can prevent effectively that the welding bits from getting into the runner, guarantees the cleanliness of runner, improves the radiating effect.
The processing method provided by the invention is used for processing the double-sided friction stir welding cold plate, on one hand, firstly, the circulation port is processed on the peripheral side surface of the substrate, the flow channels are processed on the upper side surface and the lower side surface of the substrate, then, the cover plate and the substrate are welded and molded by adopting friction welding, the complexity of the processing technology is reduced, and welding scraps can be effectively prevented from entering the flow channels in the processing process so as to ensure the cleanliness of the flow channels; on the other hand, the upper runner and the lower runner are respectively processed on the upper side surface and the lower side surface of the substrate, so that the upper runners are not communicated with each other and the lower runners are not communicated with each other, and the lower runners are communicated with the upper runners up and down, so that a cold flow path enters from one circulation port, alternately flows through the upper runner and the lower runner and finally flows out from the other circulation port, the processing technology is simple, the overall connectivity of the cold plate runner is improved, the streaming phenomenon of the cold flow medium is reduced while the fluidity of the cold flow medium is improved, and the heat dissipation effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic view of a structure of a double-sided friction stir welding cold plate according to the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is an exploded view of one direction of a double sided friction stir welded cold plate provided by the present invention;
FIG. 4 is an exploded view of another direction of a double sided friction stir welded cold plate provided by the present invention;
FIG. 5 is a schematic view of a substrate according to the present invention;
FIG. 6 is a schematic view of another direction of a substrate according to the present invention;
fig. 7 is an enlarged view at B in fig. 6.
Reference numerals:
100-a substrate; 200-cover plate;
1-a flow port;
2-upper main flow path; 21-a first upper main flow path; 22-a second upper primary runner; 23-a third upper primary runner; 24-a fourth upper primary runner;
3-upper heat dissipation area flow channel;
4-a lower main runner; 41-a first lower primary runner; 42-a second lower primary runner; 43-third lower primary runner; 44-fourth lower primary runner;
5-a lower heat dissipation area flow channel; 51-a first lower heat sink area flow channel; 52-a second lower heat sink zone flow channel;
6-upper radiating fins;
7-lower heat radiating fins.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be further described by the following detailed description with reference to the accompanying drawings.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those conventionally put in use, are merely for convenience of describing the present invention, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The cold plate is used for radiating equipment of electronic equipment, and the double-sided cold plate is that the upper surface and the lower surface of the cold plate are both provided with radiating effect.
Example 1
The embodiment provides a processing method of a double-sided friction stir welding cold plate, which comprises the following steps:
processing a circulation port: processing the flow port 1 on the peripheral side surface of the substrate 100;
processing a flow passage: processing a plurality of upper runners arranged at intervals on the upper side surface of the substrate 100, processing a plurality of lower runners arranged at intervals on the lower side surface of the substrate 100, wherein the lower runners are communicated with the upper runners, and the two runners are respectively and directly communicated with the two circulation ports 1, so that cold flow media enter from one circulation port 1, alternately flow through the upper runners and the lower runners in sequence and flow out from the other circulation port 1;
machining the cover plate 200: the cover plate 200 is designed to be matched with the flow channel according to the shape of the flow channel;
welding and forming: the cover plate 200 is welded to the base plate 100 by friction welding, and a double-sided friction stir welded cold plate is obtained.
According to the processing method provided by the embodiment, on one hand, the circulation port 1 is processed on the peripheral side surface of the substrate 100, the flow channels are processed on the upper side surface and the lower side surface of the substrate 100, and then the cover plate 200 and the substrate 100 are welded and formed by friction welding, so that the complexity of a processing technology is reduced, welding scraps can be effectively prevented from entering the flow channels in the processing process, and the cleanliness of the flow channels is ensured; on the other hand, the upper and lower runners are processed on the upper and lower sides of the substrate 100, so that the upper runners are not communicated with each other and the lower runners are not communicated with each other, but are alternately communicated with each other up and down, so that cold flow medium enters from one circulation port 1, alternately flows through the upper and lower runners, and finally flows out through the other circulation port 1.
The cold flow medium may be a cold flow liquid or a cold flow gas, and the cold flow liquid may be water, an electronic fluorination liquid (HFE), or the like. Of course, the cold flow medium may be other substances as long as it can flow and has a heat dissipation effect.
Optionally, the flow port 1 provided in this embodiment includes an inlet and an outlet, where the inlet and the outlet are disposed on one peripheral side of the substrate 100, and the cold plate flow channel may be designed as a loop, so that the cold flow medium flows out after running in the cold plate flow channel for one week, and the heat dissipation effect of the cold plate is improved. Of course, the inlet and the outlet may be disposed on two peripheral sides of the substrate 100, and the cold plate flow channel may be designed into a shape of "Chinese character 'ji' or a plurality of connected shapes of" Chinese character 'ji', so as to ensure that the cold flow medium flows through each part of the cold plate, and improve the heat dissipation effect of the cold plate. In addition, the inlet and the outlet can be exchanged according to the requirement and the installation position, and the effect can still be achieved.
Illustratively, in the welding forming step, the cover plate 200 and the substrate 100 are welded along the edge of the cover plate 200, so that on one hand, the welding strength of the substrate 100 and the cover plate 200 can be ensured, and on the other hand, the welding scraps can be effectively prevented from entering the flow channel.
Optionally, the welding forming step further includes: optionally, the cover plate 200 and the base plate 100 are secondarily welded at the interval between the upper runners; or/and, optionally, the cover plate 200 and the base plate 100 are secondarily welded at the interval between the lower runners. "optionally" means that secondary welding may be performed as desired at the spaced-apart regions between any one or more of the upper runners; or a secondary weld is made at the spacing between any one or more of the lower runners.
For example, when one cover plate 200 is provided to cover a plurality of upper runners, in order to ensure non-communication between the upper runners, it is necessary to perform secondary welding of a spacer between the upper runners.
For example, when one cover plate 200 is provided on a plurality of lower runners, in order to ensure non-communication between the lower runners, it is necessary to perform secondary welding of a spacer between the lower runners.
In addition, after the welding forming step, the method further comprises the following steps: and (3) surface treatment, namely finishing the surface flatness of the double-sided friction stir welding cold plate by adopting a fly-cutting process so as to ensure that the cold plate is fully contacted with a heat source, improve the heat dissipation effect and improve the stability of the cold plate.
As shown in fig. 1 to 7, based on the above processing method of the double-sided friction stir welding cold plate, this embodiment further provides a double-sided friction stir welding cold plate, which includes a substrate 100 and a cover plate 200 disposed on the substrate 100, where a circulation port 1 and a flow channel are disposed on the substrate 100. The flow channels are divided into an upper flow channel arranged on the upper side surface of the substrate 100 at intervals and a lower flow channel arranged on the lower side surface of the substrate 100 at intervals, wherein the lower flow channel is communicated with the upper flow channel, so that cold flow medium enters from one flow port 1, alternately flows through the upper flow channel and the lower flow channel, and finally flows out from the other flow port 1. The cover plate 200 is disposed corresponding to the flow channel, and is formed with the base plate 100 by friction welding.
According to the double-sided friction stir welding cold plate provided by the embodiment, on one hand, through the arrangement of the circulation port 1 on the peripheral side surface of the substrate 100, the upper runner and the lower runner are arranged on the upper side surface and the lower side surface of the substrate 100, the upper runners are arranged at intervals and are not communicated with each other, the lower runners are arranged at intervals and are not communicated with each other, only the upper runners and the lower runners are communicated with each other up and down, the cover plate 200 is correspondingly arranged with the runners, and the cover plate 200 is welded with the substrate 100 through friction welding, so that the complexity of a processing technology is reduced, welding scraps can be effectively prevented from entering the runners, the cleanliness of the runners is guaranteed, the overall connectivity of the cold plate runners is improved, the streaming phenomenon of cold flow media is reduced while the fluidity of the cold flow media is improved, and the heat dissipation effect is improved.
Illustratively, as shown in fig. 2 in combination with fig. 3, the upper flow channel includes an upper main flow channel 2 and an upper heat dissipation area flow channel 3, and the two upper main flow channels 2 are respectively and directly communicated with the two flow ports 1; the upper heat dissipation fins 6 are arranged on the cover plate 200 corresponding to the upper heat dissipation area flow channel 3. The upper main runner 2 is directly communicated with the circulation port 1, so that the integral pressure drop of the cold plate can be reduced, and the fluidity of cold flow medium at the circulation port 1 is improved. The upper radiating fins 6 are arranged on the cover plate 200 corresponding to the upper radiating area flow channel 3, so that the flow path of cold flow medium in the upper radiating area flow channel 3 is increased, and the radiating effect of the radiating area on the cold plate can be improved.
Preferably, in order to prevent the cover plate 200 from being warped during welding, the depth value of the upper heat dissipation area flow channel 3 is greater than the fin height value of the upper heat dissipation fins 6, so that the upper heat dissipation area flow channel 3 can sufficiently accommodate the fins of the upper heat dissipation fins 6. Specifically, the difference between the depth value of the upper heat dissipation area flow channel 3 and the fin height value of the upper heat dissipation fins 6 is more than or equal to 0.1mm.
The fin height value of the upper radiating fin 6 provided in this embodiment is not more than 5mm, the thickness of a single fin is 0.1mm, and the distance between two fins is 0.2mm.
Illustratively, as shown in fig. 4 in combination with fig. 2, the lower flow passage includes a lower main flow passage 4 and a lower heat dissipation area flow passage 5, and the two lower main flow passages 4 are respectively in direct communication with the two flow ports 1; the cover plate 200 corresponding to the lower heat dissipation area flow channel 5 is provided with a lower heat dissipation fin 7. The lower main runner 4 is directly communicated with the circulation port 1, so that the integral pressure drop of the cold plate can be reduced, and the fluidity of cold flow medium at the circulation port 1 is improved. The lower radiating fins 7 are arranged on the cover plate 200 corresponding to the lower radiating area flow channel 5, so that the circulation path of cold flow medium in the lower radiating area flow channel 5 is increased, and the radiating effect of the radiating area under the cold plate can be improved.
Preferably, in order to prevent the cover plate 200 from being warped during welding, the depth value of the lower heat dissipation area flow channel 5 is greater than the fin height value of the lower heat dissipation fins 7, so that the lower heat dissipation area flow channel 5 can sufficiently accommodate the fins of the lower heat dissipation fins 7. Specifically, the difference between the depth value of the lower heat dissipation area flow channel 5 and the fin height value of the lower heat dissipation fins 7 is more than or equal to 0.1mm.
The fin height value of the lower radiating fin 7 provided in this embodiment is not more than 5mm, the thickness of a single fin is 0.1mm, and the distance between two fins is 0.2mm.
Alternatively, in the present embodiment, one cover plate 200 is disposed on each flow channel on one side of the substrate 100.
Preferably, in order to reduce the number of the cover plates 200 to reduce the complexity of the process during the welding of the cover plates 200 to the substrate 100, at least two adjacent cover plates 200 are integrally connected. The connection can be integrated, or can be integrated by welding.
Illustratively, the cover plate 200 of the upper heat dissipation area flow channel 3 is integrally formed with the cover plates 200 of the upper main flow channels 2 adjacent to both sides thereof.
Illustratively, the cover plates 200 of the two lower heat dissipation area flow channels 5 are integrally formed with the cover plates 200 of the two lower main flow channels 4 disposed therebetween.
Preferably, as shown in fig. 5, in the double-sided friction stir welding cold plate provided in the present embodiment, the upper flow passage includes an upper main flow passage 2 and an upper heat dissipation zone flow passage 3, wherein the upper main flow passage 2 includes a first upper main flow passage 21, a second upper main flow passage 22, a third upper main flow passage 23, and a fourth upper main flow passage 24. The layout of the upper runner is as follows: the first upper main runner 21, the second upper main runner 22, the upper heat dissipation area runner 3, the third upper main runner 23 and the fourth upper main runner 24 are sequentially arranged at intervals. Wherein the second upper main runner 22, the upper heat dissipation area runner 3 and the third upper main runner 23 correspond to one cover plate 200 together, when the cover plate 200 is welded to the substrate 100, welding is performed along the edge of the cover plate 200, and then secondary welding is performed at the interval between the second upper main runner 22 and the upper heat dissipation area runner 3 and the interval between the upper heat dissipation area runner 3 and the third upper main runner 23.
Preferably, as shown in fig. 6, in the double-sided friction stir welding cold plate provided in the present embodiment, the lower flow passage includes a lower flow passage 4 and a lower heat dissipation zone flow passage 5, wherein the lower flow passage 4 includes a first lower main flow passage 41, a second lower main flow passage 42, a third lower main flow passage 43, and a fourth lower main flow passage 44; the lower heat dissipation area flow path 5 includes a first lower heat dissipation area flow path 51 and a second lower heat dissipation area flow path 52. The layout of the lower runner is as follows: the first lower main runner 41, the first lower heat dissipation area runner 51, the second lower main runner 42, the third lower main runner 43, the second lower heat dissipation area runner 52, and the fourth lower main runner 44 are disposed at intervals, the second lower main runner 42 and the third lower main runner 43 are disposed between the first heat dissipation area runner and the second lower heat dissipation area runner 52, and the second lower main runner 42 and the third lower main runner 43 are disposed along the width direction of the substrate 100. Wherein, the first lower heat dissipation area flow channel 51, the second lower main flow channel 42, the third lower main flow channel 43 and the first lower heat dissipation area flow channel 51 correspond to one cover plate 200 together, when the cover plate 200 is welded to the substrate 100, the welding is performed along the edge of the cover plate 200, and then the secondary welding is performed at the interval between the first lower heat dissipation area flow channel 51, the second lower heat dissipation area flow channel 52, the second lower main flow channel 42 and the third lower main flow channel 43.
Illustratively, as shown in fig. 7, the first lower main flow channel 41 is connected to one of the flow ports 1, and the fourth lower main flow channel 44 is connected to the other flow port 1, and both flow ports 1 may be used as inlets or outlets.
Optionally, the length of the fourth lower main runner 44 is greater than the sum of the lengths of the first lower main runner 41, the first heat dissipation area runner, the second lower main runner 42, the third lower main runner 43 and the second lower heat dissipation area runner 52, so as to improve the fluidity of the cold flow medium and improve the heat dissipation effect.
The flow path of the cold flow medium is as follows: flows in from the first flow port 1, flows through the first lower main flow passage 41, the first upper main flow passage 21, the first lower heat dissipation area flow passage 51, the second upper main flow passage 22, the second lower main flow passage 42, the upper heat dissipation area flow passage 3, the third lower main flow passage 43, the third upper main flow passage 23, the second lower heat dissipation area flow passage 52, the fourth upper main flow passage 24, and the fourth lower main flow passage 44 in this order, and then flows out from the second flow port 1.
It should be noted that, in the present embodiment, the substrate 100 is made of 6-series aluminum, the thickness of the substrate 100 is 3mm, the cover plate 200 corresponding to the upper main runner 2 and the lower main runner 4 is made of 6-series aluminum, and the cover plate 200 corresponding to the upper heat dissipation area runner 3 and the lower heat dissipation area runner 5, which are provided with heat dissipation fins, is made of 1-series aluminum. Of course, the substrate 100 and the cover 200 may be made of other materials with good heat dissipation effect, such as copper, which is not illustrated herein.
Example two
The embodiment provides a processing method of a double-sided friction stir welding cold plate, which comprises the following steps:
1. preparing materials: the aluminum substrate 100 is 6-series aluminum, the main runner cover plate 200 is 6-series aluminum, the thickness is 3mm, the cover plate 200 with a radiating fin structure is 1-series aluminum, the fin height is not more than 5mm, the fin processing limit thickness is 0.1mm, and the fin spacing is 0.2mm.
2. Processing: processing an inlet and an outlet on the peripheral side surface of the substrate 100, processing flow channels on the upper side surface and the lower side surface of the substrate 100, wherein the depth of the flow channel of a heat dissipation area is 0.1mm more than the height of a fin, so that the cover plate 200 is prevented from warping during welding;
3. welding: the friction stir welding is adopted to weld along the edge of each cover plate 200, and then secondary welding is required to be carried out in each overlap area, so that internal flow passage series flow is prevented;
4. fly cutting: the surfaces of the two sides of the cold plate fly flat, so that the planeness of the contact surface of the whole plate heat source is ensured.
In this embodiment, friction stir welding is a solid phase welding technique, which can avoid defects such as air holes and cracks generated in the fusion welding process, effectively reduce the generation of welding scraps, prevent the welding scraps from entering the runner, and ensure the cleanliness of the runner.
Based on the above processing method of the friction stir welding cold plate, the embodiment also provides a double-sided friction stir welding cold plate, which comprises a substrate 100 and a cover plate 200 arranged on the substrate 100, wherein an inlet, an outlet and a flow channel are arranged on the substrate 100. The inlet and the outlet are arranged on the peripheral side surface of the substrate 100, the flow channel is divided into an upper flow channel arranged on the upper side surface of the substrate 100 at intervals and a lower flow channel arranged on the lower side surface of the substrate 100 at intervals, and the lower flow channel is communicated with the upper flow channel, so that a cold flow path enters from one circulation port 1, alternately flows through the upper flow channel and the lower flow channel, and finally flows out from the other circulation port 1. The cover plate 200 is disposed corresponding to the flow channel, and is formed with the base plate 100 by friction welding. The inlet and the outlet of the double-sided friction stir welding cold plate can be exchanged; processing the upper flow channel and the lower flow channel on the upper and lower sides of the substrate 100, respectively, can reduce the complexity of the process and improve the design flexibility; the base plate 100 and the cover plate 200 are welded and formed through friction stir welding, so that aluminum scraps can be effectively prevented from entering the runner in the processing process, and the cleanliness of the inner runner is ensured; the depth of the heat dissipation area flow channel 3 on the base plate 100 is 0.1mm more than the height of the actual fins, and the cover plate 200 can be prevented from warping during welding.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The double-sided friction stir welding cold plate comprises a substrate (100) and a cover plate (200), wherein the substrate (100) is provided with two circulation ports (1) and flow channels, the number of the circulation ports (1) is two, the flow channels are divided into an upper flow channel which is arranged on the upper side surface of the substrate (100) at intervals and a lower flow channel which is arranged on the lower side surface of the substrate (100) at intervals, the upper flow channels are arranged at intervals and are not communicated with each other, the lower flow channels are arranged at intervals and are not communicated with each other, and the lower flow channels are communicated with the upper flow channels so that cold flow medium enters from one circulation port (1), sequentially and alternately flows through the upper flow channels and the lower flow channels and flows out from the other circulation ports (1);
the cover plate (200) is covered at a position corresponding to the upper flow passage on the upper side surface of the base plate (100), and the cover plate (200) is covered at a position corresponding to the lower flow passage on the lower side surface of the base plate (100); at least two cover plates (200) and the base plate (100) are welded and formed through friction stir welding;
the upper flow channel comprises an upper heat dissipation area flow channel (3), and an upper heat dissipation fin (6) is arranged on the cover plate (200) corresponding to the upper heat dissipation area flow channel (3);
the lower flow channel comprises a lower heat dissipation area flow channel (5), and a lower heat dissipation fin (7) is arranged on the cover plate (200) corresponding to the lower heat dissipation area flow channel (5).
2. The double-sided friction stir welding cold plate according to claim 1, wherein the depth value of the upper heat dissipation area flow channel (3) is larger than the fin height value of the upper heat dissipation fins (6); and/or
The depth value of the lower heat dissipation area flow channel (5) is larger than the fin height value of the lower heat dissipation fins (7).
3. The double-sided friction stir welding cold plate according to claim 1, wherein one cover plate (200) is provided for each runner on one side of the base plate (100), and at least two adjacent cover plates (200) are integrally connected.
4. A double sided friction stir welded cold plate according to claim 3 wherein the upper runner further comprises an upper main runner (2), the cover plate (200) of the upper heat sink zone runner (3) being integrally formed with the cover plates (200) of the upper main runner (2) adjacent to both sides thereof.
5. A double sided friction stir welded cold plate according to claim 3, wherein the lower runner further comprises a lower main runner (4), the cover plates (200) of the two lower heat dissipation area runners (5) being integrally formed with the cover plates (200) of the two lower main runners (4) disposed therebetween.
6. A method for processing a double-sided friction stir welding cold plate, characterized by comprising the steps of:
processing flow port (1): processing the flow port (1) on the peripheral side surface of the substrate (100);
processing a flow passage: processing a plurality of upper runners arranged at intervals on the upper side surface of the substrate (100), and processing a plurality of lower runners arranged at intervals on the lower side surface of the substrate (100), wherein the lower runners are communicated with the upper runners so that cold flow media enter from one circulation port (1), alternately flow through the upper runners and the lower runners in sequence and flow out from the other circulation port (1);
processing a cover plate: designing and processing a cover plate (200) matched with the flow channel according to the shape of the flow channel;
welding and forming: and welding the cover plate (200) and the base plate (100) by adopting friction stir welding to obtain the double-sided friction stir welding cold plate.
7. The method of manufacturing a double-sided friction stir welded cold plate according to claim 6, wherein in the welding forming step, the cover plate (200) and the base plate (100) are welded along edges of the cover plate (200).
8. The method of manufacturing a double-sided friction stir welded cold plate according to claim 7, wherein in the welding forming step further comprises:
at least partially in the upper flow channel-to-one spacing region, performing a secondary welding of the cover plate (200) and the base plate (100); or/and (or)
And at least partially in the space between the lower runners, performing secondary welding on the cover plate (200) and the base plate (100).
9. The method of manufacturing a double sided friction stir welded cold plate according to claim 6, further comprising, after the welding forming step: and (3) surface treatment, namely finishing the flatness of the double-sided friction stir welding cold plate by adopting a fly cutting process.
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| CN110883417B (en) * | 2019-12-20 | 2021-05-25 | 佳创机械设备制造(固安)有限公司 | Friction stir welding method for radiator product without rigid support |
| CN115443053A (en) * | 2022-11-09 | 2022-12-06 | 深圳比特微电子科技有限公司 | Liquid-cooled heat sink and liquid-cooled electronic apparatus |
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