CN116713706A - Fin type radiator processing method - Google Patents
Fin type radiator processing method Download PDFInfo
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- CN116713706A CN116713706A CN202310632625.9A CN202310632625A CN116713706A CN 116713706 A CN116713706 A CN 116713706A CN 202310632625 A CN202310632625 A CN 202310632625A CN 116713706 A CN116713706 A CN 116713706A
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- Prior art keywords
- fin
- stamping
- aluminum
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- surface roughening
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- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 93
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000003466 welding Methods 0.000 claims abstract description 67
- 238000007788 roughening Methods 0.000 claims abstract description 51
- 238000005507 spraying Methods 0.000 claims abstract description 48
- 239000011888 foil Substances 0.000 claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 42
- 229910052802 copper Inorganic materials 0.000 claims description 38
- 239000010949 copper Substances 0.000 claims description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 33
- 238000005488 sandblasting Methods 0.000 claims description 31
- 229910052759 nickel Inorganic materials 0.000 claims description 16
- 229910000679 solder Inorganic materials 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000005476 soldering Methods 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 10
- 230000003746 surface roughness Effects 0.000 claims description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 239000011135 tin Substances 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001465 metallisation Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 1
- 238000004080 punching Methods 0.000 description 29
- 239000000463 material Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 16
- 238000007747 plating Methods 0.000 description 14
- 230000007306 turnover Effects 0.000 description 12
- 230000017525 heat dissipation Effects 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000009713 electroplating Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 239000010977 jade Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 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
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention relates to a processing method of a fin type radiator, which comprises the steps of carrying out surface roughening treatment on a required welding area of an aluminum foil belt through a surface roughening device, spraying metal on the required welding area of the aluminum foil belt subjected to the surface roughening treatment through a spraying device to form a local weldable layer, stamping the aluminum foil belt with the local weldable layer to form a stamping hole, and obtaining a formed radiating fin.
Description
Technical Field
The invention relates to the technical field of radiators, in particular to a processing method of a fin radiator.
Background
In the conventional fin type radiator, for example, a heat pipe radiator is taken as an example, a heat pipe and radiating fins are welded together through solder paste, and the aluminum foil fins for radiating heat can be welded under the condition of lower than 180 ℃ only after nickel electroplating or electroless nickel plating. If the aluminum foil fin is not plated or chemically plated with a layer of weldable layer, at the welding temperature lower than 180 ℃, no proper soldering flux is used for removing a compact oxide layer on the surface of the aluminum material, so that the brazing filler metal cannot wet the aluminum base material to form a good alloy layer, and the aluminum foil fin cannot be welded. The method has the advantages that complicated chemical treatment processes are needed for forming the weldable layer through electroplating or chemical plating, a series of environmental protection problems such as chemical liquid medicine, waste liquid discharge treatment, odor treatment and the like are related, sustainable development of enterprises is not facilitated, and meanwhile, in the case that the radiator electroplating or chemical plating process cannot be completed in the same factory due to environmental protection requirements, the punched aluminum fins are transported to an electroplating or chemical plating factory and returned to the factory for welding after electroplating or chemical plating is completed, so that the production period is prolonged, the damage rate of the fins in the transportation process is increased and the like.
Further, the thermal conductivity of nickel was 73.3W/(m·k) (at 100 ℃) and the thermal conductivity of aluminum was 237W/(m·k) (at 100 ℃) and the entire surface of the aluminum foil fin was nickel-plated, and then soldering at a low temperature was possible, but the heat dissipation efficiency was lowered.
In order to solve the above problems, patent document (CN 216357981U) discloses a fin type heat sink which improves an aluminum sheet, a welding portion is provided on the aluminum sheet, and a copper foil is provided on the welding portion for stable adhesion of solder, so that a heat conductive member and the aluminum sheet can be stably welded together without nickel plating of the aluminum sheet, thereby omitting an aluminum sheet nickel plating process. However, the copper foil in the fin type heat radiator needs to be connected to the aluminum sheets through hot pressing, the number of the aluminum sheets in the fin type heat radiator is large, the process of connecting the copper foil to each aluminum sheet through hot pressing so as to weld is complex, and especially for a small fin type heat radiator, the accuracy of the copper foil position in the process step is difficult to ensure, the stability of connection is difficult to control, and the implementation difficulty is high. Therefore, it is highly desirable to provide an alternative processing method to reduce environmental pollution during the fabrication of conventional fin-type heat sinks, simplify the process and increase the heat dissipation efficiency thereof.
Disclosure of Invention
In view of the above, the present invention provides a method for processing a fin type radiator, which is green in production environment, simple in process and high in production efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a processing method of a fin type radiator comprises the following steps:
s11, unreeling and feeding an aluminum foil belt;
s12, processing to obtain a formed radiating fin with a local welding layer;
s13, sleeving a plurality of radiating fins on the copper pipe.
Further, the step S12 includes:
s1211, carrying out surface roughening treatment on a welding area required by the aluminum foil belt;
s1212, spraying metal on a required welding area of the aluminum foil tape subjected to surface roughening treatment to form a local weldable layer;
and S1213, stamping the aluminum foil strip with the local weldable layer, and forming a stamping hole and a stamping flanging by stamping to obtain the formed heat radiation fin.
Further, at least one punching hole is formed in the heat dissipation fin, the punching hole is used for the copper pipe to pass through, the punching hole is at least partially positioned on the partial welding layer, and the inner wall of the punching hole is formed with the partial welding layer for welding with the copper pipe.
Further, at least one stamping turnover edge is arranged on the radiating fin, and a local welding layer is formed on the surface of the stamping turnover edge and is used for being welded with the aluminum bottom plate.
Further, the step S12 includes:
s1221, stamping an aluminum foil belt to form a stamping hole and a stamping flanging edge to obtain a formed radiating fin;
s1222, carrying out surface roughening treatment on a welding area required by the radiating fins;
s1223, spraying metal on the welding area required by the radiating fin subjected to the surface roughening treatment to form a local weldable layer.
Further, the method also comprises the following steps:
s21, feeding an aluminum bottom plate;
s22, carrying out surface roughening treatment on a welding area required by the aluminum bottom plate;
s23, spraying metal on the welding area required by the aluminum bottom plate to form a local weldable layer.
Further, the surface roughening treatment method is sand blasting, and after the surface roughening treatment, the surface roughness of the required welding area is 2.5-3.5 mu m.
Further, the thickness of the local solderable layer after metallization is in the range of 0.3-10 μm.
Further, the sprayed metal is nickel, copper, tin, silver or gold.
Further, the method also comprises the following steps:
s31, injecting solder paste at the welding position of the copper pipe and the fins, and brushing the solder paste on the local part of the aluminum bottom plate;
s32, after the fins with the copper tubes penetrating through are assembled with the aluminum bottom plate, clamping the fins with a clamp to ensure the stability of assembly;
s33, feeding the clamp into a reflow oven for reflow soldering so as to enable the copper pipe and the fins to be welded together by the aluminum bottom plate and the fins;
s34, removing the clamp after discharging, and obtaining the fin type radiator.
Compared with the prior art, the invention has the beneficial effects that:
(1) By arranging the local weldable layer, the whole electroplating or chemical plating of the radiating fins is not needed, so that the pollution to the environment caused by electroplating or chemical plating is avoided; particularly, under the condition that the electroplating or chemical plating process of the radiator cannot be completed in the same factory due to the environmental protection requirement, the punched aluminum fins are not required to be transported to the electroplating or chemical plating factory, the production process is simplified, and the defects of high damage rate, overlong production period and the like of the fins caused in the transportation process are avoided.
(2) The welding layer can be obtained by locally spraying the required welding part according to the actual welding part, the whole nickel plating of the fins is not needed, the heat conductivity of aluminum is far higher than that of nickel, and the heat dissipation performance of the heat dissipation fins plated with nickel is far higher than that of the whole nickel plating fins, so that the number of the required fins can be reduced to realize the same heat dissipation effect, the consumption of aluminum materials can be reduced at the same time, and the product cost is greatly reduced on the premise of ensuring the heat dissipation effect.
(3) By arranging the local welding layer, whole nickel plating is not needed, and meanwhile, the consumption of noble metal is reduced, so that the product cost is further reduced.
(4) The surface roughness of the aluminum foil belt after surface roughening treatment and the thickness of the weldable layer formed by spraying are controlled, so that the sprayed metal forms physical adhesion on the roughened surface, and when the local thickness of the weldable layer is controlled to be 0.3-10 mu m, the weldable layer does not form continuous sheet metal, and therefore the peeling phenomenon caused by the influence of the expansion coefficient of the metal is avoided.
(5) The aluminum foil strip is stamped at the local welding layer position, so that the local welding layer is formed on the inner wall of the stamping hole, particularly, sprayed metal is adhered to the inner wall of the stamping hole for welding with the copper pipe, the local welding layer is formed on the surface of the stamping turnover edge for welding with the aluminum bottom plate, the radiating fins are not required to be connected with the welding materials through other methods, the assembly line production is convenient to realize, and the production efficiency is improved. After the copper pipe passes through the punching hole attached with the sprayed metal, the reflow soldering is convenient, and the copper pipe and the radiating fins are stably soldered together through solder paste at a soldering temperature lower than 180 ℃.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart showing a method for manufacturing a fin-type heat sink according to an embodiment of the invention;
FIG. 2 shows a top view of a spray-applied partially solderable aluminum foil strip in accordance with an embodiment of the present invention;
fig. 3 shows a top view of a heat sink fin according to an embodiment of the invention;
fig. 4 is a perspective view of a heat sink fin according to an embodiment of the invention;
fig. 5 is a flow chart of a method for manufacturing a two-fin heat sink according to an embodiment of the invention.
In the figure: 1. an aluminum foil tape; 2. a local solderable layer; 3. a heat radiation fin; 4. punching a hole; 5. stamping the flanging edge.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a processing method of a fin type radiator, which is specifically as follows.
Example 1
As shown in fig. 1-4, the radiator of the embodiment of the invention comprises a radiating fin 3, a copper pipe and an aluminum bottom plate, wherein as shown in fig. 4, which is a perspective view of the radiating fin 3, two punching holes 4 are formed in the radiating fin 3, the radiating fin 3 is sleeved on the copper pipe through the punching holes 4, and the radiating fin 3 and the copper pipe are welded together through a reflow soldering process; the heat radiation fins 3 are provided with two rectangular stamping turnover edges 5, the stamping turnover edges 5 are positioned at the bottoms of the heat radiation fins 3 and are perpendicular to the heat radiation fins 3, and the fin group penetrated with copper tubes is welded with the aluminum bottom plate through the stamping turnover edges 5.
Fig. 1 shows a processing method of a fin-type radiator according to an embodiment of the invention, which includes the following steps:
s11, unreeling and feeding the aluminum foil belt.
S12, processing to obtain the formed radiating fin with the local welding layer.
Preferably S12 comprises:
s1211, carrying out surface roughening treatment on a welding area required by the aluminum foil strip.
According to the required welding position of the radiator, the required welding area on the aluminum foil belt is determined, in this embodiment, the heat radiating fin 3 is provided with two punching holes 4 and two punching flanging edges 5, and the punching holes 4 and the punching flanging edges 5 are the required welding positions, so that the required welding area is set at the corresponding position of the aluminum foil belt, and the punching holes 4 and the punching flanging edges 5 are positioned on the required welding area.
After the aluminum foil belt enters the surface roughening device, the part which does not need surface roughening treatment is shielded by a mould in a shielding mode, the surface roughening treatment is carried out by a sand blasting mode, and the process parameters of the surface roughening device are controlled to ensure that the surface roughness range of the treated part of the aluminum foil belt is 2.5-3.5 mu m after the surface roughening treatment is finished.
Preferably, when the surface roughening device is sandblasted, the following technological parameters are adopted: the sand blasting material is 60-80 mesh brown steel jade, the sand blasting distance is 0.2-0.3m, the sand blasting angle is 75-90 degrees, the sand blasting air pressure is 0.3-0.5MPa, the diameter of a sand blasting nozzle is 5-8mm, and the moving speed of a workpiece relative to a sand blasting gun is 10-15m/min.
After surface roughening treatment, microscopic dents are generated on the surface of the aluminum material, the surface roughness is increased, so that the physical adhesive force between two metals is increased, and the surface roughness range of the aluminum foil belt after the surface roughening treatment is controlled to be 2.5-3.5 mu m, so that the sprayed metal forms physical adhesion on the roughened surface in the next spraying process, and the bonding force between the radiating fins and the sprayed metal is ensured.
S1212, spraying metal on the required welding area of the aluminum foil strip subjected to the surface roughening treatment to form a local weldable layer.
As shown in fig. 2, the aluminum foil strip 1 after the surface roughening treatment enters a spraying device, the part which does not need the spraying treatment is shielded by a mould in a shielding mode, the spraying treatment is carried out, a local weldable layer 2 is formed, and the thickness range of the local weldable layer 2 is ensured to be 0.3-10 μm by controlling the technological parameters of the spraying device.
Preferably, when the spraying device performs spraying, the process parameters are as follows: the spraying material is metallic nickel, and the feeding speed is as follows: 0.3-0.5m/s, spraying pressure of 0.5-1.0MPa, metal melting initial temperature of 800-1300 ℃ and spraying distance of 0.3-0.5m.
The local weldable layer is too thin to achieve the weldable effect; the local solder layer is too thick, continuous sheet metal can be formed, the continuous sheet metal is influenced by the expansion coefficient of the metal, the peeling phenomenon is easy to occur under the physical acting force of thermal expansion and cold contraction, and the continuous sheet metal is easy to separate after being stressed, so that the tensile force of the solder layer is insufficient.
The spray material can be selected from nickel, copper, tin, silver or gold according to actual needs. Preferably, the spray material is copper.
And S1213, stamping the aluminum foil strip with the local weldable layer, and forming a stamping hole and a stamping flanging by stamping to obtain the formed heat radiation fin.
As shown in fig. 4, the heat dissipation fins 3 obtained after punching have punching holes 4 through which copper tubes pass, the punching holes 4 are located on the local solderable layer 2, after punching is completed, local solderable layers, specifically, sprayed metal is attached to the inner walls of the punching holes 4, and after the copper tubes pass through the punching holes 4, the sprayed metal attached to the inner walls of the punching holes 4 can enable the heat dissipation fins 3 and the copper tubes to be stably welded together.
The heat radiation fins 3 are provided with two stamping turnover edges 5 which are used for being welded with the aluminum bottom plate, the stamping turnover edges 5 are positioned on the local weldable layer 2, and the local weldable layer is formed on the stamping turnover edges 5, so that the heat radiation fins 3 and the aluminum bottom plate can be stably welded together.
Furthermore, the number of the punching holes can be one or more according to actual product requirements, and each punching hole is at least partially positioned on the partial welding layer, so that the partial welding layer can be formed on the inner wall part of the punching hole, and the punching hole can be used for welding with a copper pipe.
Furthermore, the stamping turnover edges can be arranged into one or more according to actual product requirements, and each stamping turnover edge is at least partially positioned on the partial weldable layer so as to ensure that the stamping turnover edge part forms the partial weldable layer, thereby being used for being welded with the aluminum bottom plate.
S13, sleeving a plurality of radiating fins on the copper pipe.
S21, feeding an aluminum bottom plate.
The formed aluminum bottom plate is sent into the surface roughening device through a feeder.
S22, carrying out surface roughening treatment on the welding area required by the aluminum bottom plate.
Determining a required welding area on an aluminum bottom plate according to a required welding position of a radiator, shielding a part which does not need surface roughening treatment through a mould after the aluminum bottom plate enters the surface roughening device, carrying out surface roughening treatment through a sand blasting mode, and controlling technological parameters of the surface roughening device to ensure that the surface roughness range of the aluminum bottom plate is 2.5-3.5 mu m after the surface roughening treatment is finished.
Preferably, when the surface roughening device is sandblasted, the following technological parameters are adopted: the sand blasting material is 60-80 mesh brown steel jade, the sand blasting distance is 0.2-0.3m, the sand blasting angle is 75-90 degrees, the sand blasting air pressure is 0.3-0.5MPa, the diameter of a sand blasting nozzle is 5-8mm, and the moving speed of a workpiece relative to a sand blasting gun is 10-15m/min.
S23, spraying metal on the welding area required by the aluminum bottom plate to form a local weldable layer.
The aluminum bottom plate subjected to surface roughening treatment enters a spraying device, the part which is not required to be sprayed is shielded by a mould in a shielding mode, spraying treatment is carried out, a local weldable layer is formed, and the thickness range of the local weldable layer is ensured to be 0.3-10 mu m by controlling the technological parameters of the spraying device.
Preferably, when the spraying device performs spraying, the process parameters are as follows: the spraying material is metallic nickel, and the feeding speed is as follows: 0.3-0.5m/s, spraying pressure of 0.5-1.0MPa, metal melting initial temperature of 800-1300 ℃ and spraying distance of 0.3-0.5m.
The spray material can be selected from nickel, copper, tin, silver or gold according to actual needs.
S31, injecting solder paste at the welding position of the copper pipe and the fins, and brushing the solder paste on the partial welding layer of the aluminum bottom plate.
S32, after the fin group penetrated with the copper pipe is assembled with the aluminum bottom plate, the fin group is clamped by a clamp to ensure the stability of the assembly.
S33, sending the clamp into a reflow oven for reflow soldering so as to enable the copper pipe and the fins, and welding the aluminum bottom plate and the fin group together.
S34, removing the clamp after discharging, and obtaining the fin type radiator.
Embodiment two:
in order to further accurately position the local solderable layer, reduce the amount of metal used for spraying and improve the heat dissipation performance of the heat sink, the invention also provides a processing method of the fin type heat sink shown in fig. 5, which comprises the following steps:
s11, unreeling and feeding the aluminum foil belt.
S12, processing to obtain the formed radiating fin with the local welding layer.
Preferably S12 comprises:
s1221, stamping the aluminum foil strip to form a stamping hole and a stamping flanging edge, thereby obtaining the formed heat radiation fin.
And stamping to obtain the formed radiating fin, wherein the fin is provided with at least one stamping hole and at least one stamping flanging.
S1222, carrying out surface roughening treatment on the welding area required by the radiating fin.
And (3) carrying out surface roughening treatment on the inner wall of the punching hole and the surface of the punching flanging which is required to be contacted with the aluminum bottom plate in a sand blasting mode, wherein the surface roughness range is 2.5-3.5 mu m after the surface roughening treatment is finished.
Preferably, when the surface roughening device is sandblasted, the following technological parameters are adopted: the sand blasting material is 60-80 mesh brown steel jade, the sand blasting distance is 0.2-0.3m, the sand blasting angle is 75-90 degrees, the sand blasting air pressure is 0.3-0.5MPa, the diameter of a sand blasting nozzle is 5-8mm, and the moving speed of a workpiece relative to a sand blasting gun is 10-15m/min.
S1223, spraying metal on the welding area required by the radiating fin subjected to the surface roughening treatment to form a local weldable layer.
And (3) spraying the inner wall of the punching hole and the surface of the punching flanging which is required to be contacted with the aluminum bottom plate to form a local welding layer, and controlling the technological parameters of a spraying device to ensure that the thickness range of the local welding layer is 0.3-10 mu m.
Preferably, when the spraying device performs spraying, the process parameters are as follows: the spraying material is metallic nickel, and the feeding speed is as follows: 0.3-0.5m/s, spraying pressure of 0.5-1.0MPa, metal melting initial temperature of 800-1300 ℃ and spraying distance of 0.3-0.5m.
The spray material can be selected from nickel, copper, tin, silver or gold according to actual needs.
S13, sleeving a plurality of radiating fins on the copper pipe.
S21, feeding an aluminum bottom plate.
The formed aluminum bottom plate is sent into the surface roughening device through a feeder.
S22, carrying out surface roughening treatment on the welding area required by the aluminum bottom plate.
Determining a required welding area on an aluminum bottom plate according to a required welding position of a radiator, shielding a part which does not need surface roughening treatment through a mould after the aluminum bottom plate enters the surface roughening device, carrying out surface roughening treatment through a sand blasting mode, and controlling technological parameters of the surface roughening device to ensure that the surface roughness range of the aluminum bottom plate is 2.5-3.5 mu m after the surface roughening treatment is finished.
Specifically, when the surface roughening device is subjected to sand blasting, the process parameters are as follows: the sand blasting material is 60-80 mesh brown steel jade, the sand blasting distance is 0.2-0.3m, the sand blasting angle is 75-90 degrees, the sand blasting air pressure is 0.3-0.5MPa, the diameter of a sand blasting nozzle is 5-8mm, and the moving speed of a workpiece relative to a sand blasting gun is 10-15m/min.
S23, spraying metal on the welding area required by the aluminum bottom plate to form a local weldable layer.
The aluminum bottom plate subjected to surface roughening treatment enters a spraying device, the part which is not required to be sprayed is shielded by a mould in a shielding mode, spraying treatment is carried out, a local weldable layer is formed, and the thickness range of the local weldable layer is ensured to be 0.3-10 mu m by controlling the technological parameters of the spraying device.
Specifically, when the spraying device performs spraying, the technological parameters are as follows: the spraying material is metallic nickel, and the feeding speed is as follows: 0.3-0.5m/s, spraying pressure of 0.5-1.0MPa, metal melting initial temperature of 800-1300 ℃ and spraying distance of 0.3-0.5m.
The spray material can be selected from nickel, copper, tin, silver or gold according to actual needs.
S31, injecting solder paste at the welding position of the copper pipe and the fins, and brushing the solder paste on the partial welding layer of the aluminum bottom plate.
S32, after the fin group penetrated with the copper pipe is assembled with the aluminum bottom plate, the fin group is clamped by a clamp to ensure the stability of the assembly.
S33, sending the clamp into a reflow oven for reflow soldering so as to enable the copper pipe and the fins, and welding the aluminum bottom plate and the fin group together.
S34, removing the clamp after discharging, and obtaining the fin type radiator.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The processing method of the fin type radiator is characterized by comprising the following steps of:
s11, unreeling and feeding an aluminum foil belt;
s12, processing to obtain a formed radiating fin with a local welding layer;
s13, sleeving a plurality of radiating fins on the copper pipe.
2. The method for manufacturing a fin-type heat sink as claimed in claim 1, wherein the step S12 includes:
s1211, carrying out surface roughening treatment on a welding area required by the aluminum foil belt;
s1212, spraying metal on a required welding area of the aluminum foil tape subjected to surface roughening treatment to form a local weldable layer;
and S1213, stamping the aluminum foil strip with the local weldable layer, and forming a stamping hole and a stamping flanging by stamping to obtain the formed heat radiation fin.
3. The method of claim 2, wherein the heat sink fin has at least one hole punched therein for the copper tube to pass through, the hole being at least partially located on the partially solderable layer, and the hole having an inner wall formed with the partially solderable layer for soldering with the copper tube.
4. The method of claim 2, wherein the heat sink fin has at least one stamped flange formed with a partially solderable layer for soldering to an aluminum substrate.
5. The method for manufacturing a fin-type heat sink as claimed in claim 1, wherein the step S12 includes:
s1221, stamping an aluminum foil belt to form a stamping hole and a stamping flanging edge to obtain a formed radiating fin;
s1222, carrying out surface roughening treatment on a welding area required by the radiating fins;
s1223, spraying metal on the welding area required by the radiating fin subjected to the surface roughening treatment to form a local weldable layer.
6. A method of manufacturing a fin radiator as claimed in claim 2 or 5, further comprising the steps of:
s21, feeding an aluminum bottom plate;
s22, carrying out surface roughening treatment on a welding area required by the aluminum bottom plate;
s23, spraying metal on the welding area required by the aluminum bottom plate to form a local weldable layer.
7. The method of claim 6, wherein the surface roughening is performed by sandblasting, and the surface roughness of the desired solder area is in the range of 2.5-3.5 μm.
8. The method of claim 6, wherein the thickness of the partial solderable layer after metallization is in the range of 0.3-10 μm.
9. The method of claim 6, wherein the metal is nickel, copper, tin, silver or gold.
10. The method of processing a fin radiator of claim 6, further comprising the steps of:
s31, injecting solder paste at the welding position of the copper pipe and the fins, and brushing the solder paste on the local part of the aluminum bottom plate;
s32, after the fins with the copper tubes penetrating through are assembled with the aluminum bottom plate, clamping the fins with a clamp to ensure the stability of assembly;
s33, feeding the clamp into a reflow oven for reflow soldering so as to enable the copper pipe and the fins to be welded together by the aluminum bottom plate and the fins;
s34, removing the clamp after discharging, and obtaining the fin type radiator.
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| CN202310632625.9A CN116713706A (en) | 2023-05-31 | 2023-05-31 | Fin type radiator processing method |
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| CN202310632625.9A CN116713706A (en) | 2023-05-31 | 2023-05-31 | Fin type radiator processing method |
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