CN106425007B - Welding structure and method for vacuum brazing of metal plate and metal fin - Google Patents
Welding structure and method for vacuum brazing of metal plate and metal fin Download PDFInfo
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- CN106425007B CN106425007B CN201610864378.5A CN201610864378A CN106425007B CN 106425007 B CN106425007 B CN 106425007B CN 201610864378 A CN201610864378 A CN 201610864378A CN 106425007 B CN106425007 B CN 106425007B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
- B23K3/087—Soldering or brazing jigs, fixtures or clamping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
Abstract
the invention discloses a welding structure for vacuum brazing of a metal plate and a metal fin, which comprises the metal fin, the metal plate and a welding flux layer, wherein the metal plate is provided with a plurality of welding flux layers; the metal fins are formed by arranging a plurality of forces in parallel at intervals; the solder layers are arranged on two sides of the metal plate to form composite soldering lugs, the composite soldering lugs are respectively inserted into intervals between the forces to form a soldering main body, the thickness of each composite soldering lug is equal to the distance between the forces, the height of each composite soldering lug is smaller than that of each metal fin, and the length of each composite soldering lug is larger than that of each metal fin; the welding structure for vacuum brazing of the metal plate and the metal fin further comprises a welding clamp for clamping and fixing the welding main body, and the welding clamp comprises a clamping structure for clamping and fixing two side faces, parallel to the composite soldering lug, of the welding main body. Also discloses a welding method for vacuum brazing of the metal plate and the metal fin; according to the invention, the metal plate and the metal fin are skillfully matched, so that a finished product after vacuum welding can obtain better welding quality, the production efficiency is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to a welding structure, in particular to a welding structure and a welding method for vacuum brazing of metal plates and metal fins, which can avoid the problem of insufficient welding between the metal fins and a metal base.
Background
In the field of welding, the demands for high quality welding are increasing, with increasing demands for precision and quality in the metal working industry. Vacuum brazing means that workpieces are heated in a vacuum chamber and is mainly used for welding products with high quality and easily-oxidized materials. Compared with common welding, the method can achieve more accurate and perfect welding effect, and meet the welding requirement between more precise metal devices. For example, the machining of the metal structural parts of heat sinks that are very commonly used on the market; in order to achieve better heat dissipation, a heat sink generally includes a fin portion for enlarging a heat dissipation area and a base portion in surface contact with a heat generating device. The existing processing modes are probably as follows:
1. adopt metal sheet base 2a and metal fin 1a directly to adopt frock clamp to weld metal fin and metal base, the radiator product that has thinner denser fin generally all adopts the folding fin of S type metal as the preparation part, place the fin whole in the metal sheet top, then weld contact site, as shown in figure 1, but frock clamp is complicated, the process is various, because welding quality is unstable, often can lead to the fin to have the deformation, and the welding area between fin and the base is little, joint strength is low, lead to the rosin joint scheduling problem easily.
2. the manufacturing method adopts a shovel fin mode, as shown in fig. 2, a metal fin 1b is directly machined on a metal plate by equipment, so that spaced grooves are dug on the solid metal plate, and the metal fin 1b with a certain thickness is formed on a solid base 2 b.
3. the metal fin 1c and the base 2c are manufactured by machining, and as shown in fig. 3, the metal fin and the base are not suitable for machining due to the defects of high cost, low efficiency, high requirement on the precision of equipment and the like.
therefore, the existing radiator structure formed by processing the metal fins with small thickness and small distance and the metal plate generally has the problems of low welding quality, process difficulty, low production efficiency and high cost.
Disclosure of Invention
the technical problem to be solved by the invention is to provide a welding structure for vacuum brazing of a metal plate and a metal fin, and the problem of unstable welding quality between the metal fin and a metal base is solved.
the technical solution of the invention is as follows:
A welding structure for vacuum brazing of a metal plate and a metal fin comprises the metal fin, wherein the welding structure also comprises the metal plate and a welding flux layer; the metal fins are formed by arranging a plurality of forces in parallel at intervals; the welding flux layer is arranged on two sides of the metal plate to form composite welding sheets, the composite welding sheets are respectively inserted into intervals among the power bodies to form a welding main body, the thickness of each composite welding sheet is equal to the interval among the power bodies, the height of each composite welding sheet is smaller than that of each metal fin, and the length of each composite welding sheet is larger than that of each metal fin; the welding structure for vacuum brazing of the metal plate and the metal fin further comprises a welding clamp for clamping and fixing the welding main body, wherein the welding clamp comprises a clamping structure for clamping and fixing two side faces, parallel to the composite soldering lug, of the welding main body.
the invention also provides a welding method for vacuum brazing of the metal plate and the metal fin, which effectively solves the problem of unstable welding quality between the metal fin and the metal base.
The technical solution is as follows:
a method of welding a metal plate to a metal fin by vacuum brazing, wherein the method comprises the steps of:
respectively inserting a plurality of composite soldering lugs between adjacent stiffening forces of a metal fin to form a welding main body, wherein the thickness of each composite soldering lug is equal to the distance between the adjacent stiffening forces;
clamping the outer side surface of the part, provided with the composite soldering lug, of the welding main body by using a welding fixture to form a welding structure for vacuum brazing of the metal plate and the metal fin;
thirdly, putting the welding structure of the metal plate and the metal fin in vacuum brazing into a vacuum brazing furnace for welding;
and step four, taking out the welded structure of the metal plate and the metal fin through vacuum brazing, detaching the welding fixture, and cutting and processing the welded structure of the metal plate and the metal fin through vacuum brazing according to the product design structure to form an integral product with a base of a solid structure and the metal fin.
From the above description, it is clear that the present invention has the following advantages:
The invention relates to a welding structure and a method for vacuum brazing of a metal plate and a metal fin, which take the metal fin as a main body part, insert a composite soldering lug of the metal plate with a solder layer into a part of the metal fin needing to form a solid base, respectively compress a plurality of composite soldering lugs with the metal fin to form the solid structure, clamp and fix the composite soldering lug by a welding clamp and then send the composite soldering lug and the metal fin into a vacuum brazing furnace for welding, thereby obtaining the solid base part formed by welding the composite soldering lug and the metal fin in a large area, and the welding structure and the method for vacuum brazing of the metal plate and the metal fin have the following advantages:
1. the structure is simple, the operation is convenient, and the production efficiency is improved;
2. the production cost is low, the welding strength is high, the phenomenon of non-welding is avoided, and the problem of unstable welding quality between the metal fin and the base is solved;
3. The problem that the metal fins are easy to bend and deform due to the fact that the metal fins are welded in the height direction by a long man is solved;
4. The uniformity of the spacing between the stiffness of the metal fin and the stiffness is better ensured.
Drawings
FIG. 1 is a schematic structural diagram of a conventional heat sink body structure fabricated by direct welding;
FIG. 2 is a schematic structural diagram of a conventional heat sink main body structure with a blade structure;
FIG. 3 is a schematic structural diagram of a conventional directly formed heat sink body structure;
FIG. 4 is a schematic structural view of a welding body of the welding structure for vacuum brazing of metal plates and metal fins according to the present invention;
FIG. 5 is a schematic structural view of a welded structure of vacuum brazing of metal plates and metal fins according to the present invention;
FIG. 6 is a schematic view of a welded structure of vacuum brazing of metal plates and metal fins according to the present invention after welding and finish machining;
FIG. 7 is a schematic structural diagram of a punching jig in the welding method for vacuum brazing of metal plates and metal fins according to the present invention;
FIG. 8 is a schematic view of the welding method for vacuum brazing of metal plates and metal fins according to the present invention.
main element number description:
The invention comprises the following steps:
1. 1a, 1b, 1 c: metal fin 11: 12 of a strength: bolt head hole
2. 2a, 2b, 2 c: base 3: composite lug 31: positioning pin hole
32: and (3) positioning pin A: the welding main body 4: welding fixture
41: fixing plate 42: limiting plate 43: fixed pressing plate
44: the backing plate 45: the hold-down bolt 46: fixing bolt
5: metal fin punching jig 51: the upper clamp plate 52: lower splint
511. 521: spacing fixed plate 6: punching equipment
Detailed Description
in order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The invention relates to a welding structure for vacuum brazing of a metal plate and a metal fin, which is particularly suitable for processing a radiator product with denser and thinner fins in main application. The invention also adopts metal fins, but the metal fins can be formed by a plurality of independent metal sheets (strength) or integral metal folded fins, but the structure is different from the structure of the existing radiator vacuum brazing. In a preferred embodiment of the present invention, the material of the inserted metal plate is the same as that of the metal fin, so as to avoid the problem of deformation of the fin caused by welding stress generated due to different thermal expansion coefficients of the materials. In general, the material of the metal plate and the metal fin may be aluminum, aluminum alloy, copper alloy, stainless steel, alloy steel, low carbon steel, titanium, nickel, inconel, or the like.
Referring to fig. 4 and 5, which are schematic views illustrating a welding structure for vacuum brazing of metal plates and metal fins according to the present invention, in a preferred embodiment, the welding structure for vacuum brazing of metal plates and metal fins according to the present invention includes a metal fin 1, a metal plate and a solder layer; the metal fin 1 is formed by arranging a plurality of stiffeners 11 in parallel at intervals, and the integral metal fin 1 can be formed by a plurality of independent stiffeners 11 or an integral folding metal fin; the welding flux layer is arranged on two sides of the metal plate to form composite welding sheets 3, the composite welding sheets 3 are respectively inserted into intervals among the power bodies 11 to form a welding main body A, the thickness of each composite welding sheet 3 is equal to the distance among the power bodies 11, so that two side faces of each composite welding sheet 3 can be in close contact with the contact surface of the adjacent power body 11, and the welding effectiveness is guaranteed; the height of the metal fin is less than that of the metal fin 1, and the length of the metal fin is greater than that of the metal fin 1; the position of the composite soldering lug 3 inserted on the metal fin 1 can be adjusted according to product design, and a common radiator product is designed in such a way that the bottom part of the metal fin is made into a metal solid base 2; of course, the heat sink can also be arranged at other positions, such as the middle part, and after welding is completed, the middle position of the solid part can be cut to form two identical heat sinks; the height of the composite soldering lug 3 can be adjusted according to the requirement, that is, the upper surface of the metal solid base 2 of the product can be not a horizontal plane, and the composite soldering lug 3 can be adjusted to form an inclined plane or a curved surface and the like according to the specific requirement; the length of the composite soldering lug 3 is larger than that of the metal fin 1, so that the composite soldering lug 3 is provided with a part protruding out of the metal fin 1 after being inserted, the welding of the composite soldering lug and the metal fin 1 is more complete, and meanwhile, the composite soldering lug 3 is clamped instead of the metal fin when the welding clamp 4 clamps two ends of the extending direction of the welding main body A, so that the possibility of damage of the metal fin is reduced. Of course, in some cases, the composite lug 3 may not protrude from the metal fin 1, but may be kept flush with the metal fin 1. As shown in fig. 5, the welding structure for vacuum brazing of metal plates and metal fins further comprises a welding fixture 4 for clamping and fixing the welding body a, and the welding fixture 4 comprises a clamping structure for clamping and fixing two sides of the welding body a parallel to the composite lug, that is, the welding structure can press the fins and the composite lug tightly. The welding jig 4 of the present invention may be a jig structure that satisfies the requirement of firmly clamping the welding body a.
In the above-mentioned welding structure for vacuum brazing of metal plate and metal fin, in the preferred embodiment, the composite welding lug 3 is an integral structure formed by coating a solder layer on the metal plate. In the actual processing process, before the metal fin is welded in a vacuum brazing furnace, a technician inserts the integral composite soldering lug 3 into the interval between the stiffness 11 and the stiffness 11 of the metal fin 1, and if the metal plate and the solder layer are integrally prepared in advance, the production efficiency can be better improved.
In the welded structure of vacuum brazing between metal plates and metal fins as described above, in the preferred embodiment, the thickness of the portion of the composite lug 3 protruding from the metal fin 1 is the sum of the distance between the spaced apart beams 11 and the thickness of the beams 11. Since the composite tab 3 is not stiff between the portions outside the metal fin 1 to fill the gap distance, the thickness of the portion of the composite tab 3 outside the metal fin 1 needs to be a large thickness, which is the sum of the gap between the beam 11 and the thickness of one beam 11. The shape may be T-shaped or L-shaped, and may be set as needed. So as to ensure that the composite soldering lug 3 at the outer side of the metal fin 1 is not deformed due to the weak filling in the middle after being pressed. Of course, the portion of the composite lug 3 protruding out of the metal fin 1 may be designed to have no solder layer.
Referring to fig. 4 and 5, in the welding structure for vacuum brazing of metal plates and metal fins, in a preferred embodiment, all the composite welding pieces 3 outside the two end portions of the metal fin 1 are provided with positioning pin holes 31 which are communicated with each other, and positioning pins 32 are inserted into the positioning pin holes 31. Of course, the position of the positioning pin hole 31 is the part to be cut and removed after the welding is completed, so that in order to avoid the uneven assembly of the composite soldering lug 3 and influence on the subsequent assembly and product forming, a specific number of positioning pin holes 31 can be processed on both sides of the composite soldering lug 3, and the composite soldering lug 3 can be assembled by using the positioning pins 32.
in the above-mentioned welding structure for vacuum brazing of metal plates and metal fins, in a preferred embodiment, referring to fig. 5, the welding fixture 4 includes: a fixed plate 41, a stopper plate 42, and a fixed presser plate 43. The fixing plate 41 is parallel to the first side surface of the welding main body a and is arranged in close contact therewith, the fixing plate 41 is used for supporting one side of the welding main body a, and one side surface of the welding main body a abuts against the fixing plate 41 after the welding main body a is placed into the welding fixture 4; the two limiting plates 42 are perpendicular to the fixing plate 41, one end portions of the two limiting plates are fixed to two ends of the fixing plate 41, and the two limiting plates 42 clamp two side surfaces of the welding main body a formed by the two ends of the metal plate, namely two cut side surfaces of the welding main body a; a fixed pressing plate 43 is arranged opposite to the fixed plate 41 and fixed at the other end parts of the two limit plates 42, a plurality of pressing bolts 45 are arranged on the fixed pressing plate 43, a backing plate 44 tightly attached to a second side surface opposite to the first side surface of the welding main body A is arranged on the inner side of the fixed pressing plate 43, and the backing plate 44 is tightly pressed on the welding main body A through the pressing bolts 45; therefore, the fixing plate 41, the limiting plate 42 and the fixing pressure plate 43 can be connected and fixed through the fixing bolt 46 to form a rectangular frame capable of accommodating the welding main body A, the welding main body A is tightly pressed on the second side surface through the backing plate 44, and sufficient pressure is applied to tightly attach the welding main body A and the composite welding sheet 3 together, so that the best welding effect and quality can be achieved after the welding structure for vacuum brazing of the metal plate and the metal fin is placed into a vacuum brazing furnace for welding. In a further embodiment, in order to avoid adhesion between the welding body a and the welding fixture 4 during welding, the contact surface of the welding fixture 4 contacting the welding body a is coated with an adhesion preventing layer for preventing adhesion of solder, and preferably, a ceramic layer for preventing adhesion may be sprayed on the contact surface of the welding fixture 4; therefore, after welding is completed, the welding main body A can be easily taken down without damaging the structure of the welding main body A.
the invention realizes a welding structure for vacuum brazing of metal plates and metal fins, which can bring higher-quality welding effect and better product structural strength for vacuum brazing by skillfully combining the metal plates and the metal fins, and provides the following welding method for vacuum brazing of the metal plates and the metal fins for the implementation of the technology, and in the preferred embodiment, please refer to fig. 8, the method comprises the following steps:
step one S01, respectively inserting a plurality of composite soldering lugs 3 between adjacent tie bars 11 of the metal fin 1 to form a welding main body A, wherein the thickness of each composite soldering lug 3 is equal to the distance between the adjacent tie bars 11; so that the respective strength 11 of the metal fin 1 can be brought into sufficient contact with the composite lug 3 and a solid structure is formed at a portion where the composite lug 3 is inserted.
Step two S02, the outer side surface of the part of the welding main body A, which is provided with the composite soldering lug 3, is clamped by a welding fixture 4, and a welding structure for vacuum brazing of metal plates and metal fins is formed to fix the whole welding structure.
Step three S03, putting the welding structure of the metal plate and the metal fin in vacuum brazing into a vacuum brazing furnace for welding; through the high temperature effect of vacuum brazing furnace for the welding layer on compound soldering lug 3 welds metal sheet and metal fin 1's strength 11 together, forms the pedestal that has the solid construction of welding as an organic whole.
Step four S04, the welding structure of the vacuum brazing of the metal plate and the metal fin is taken out, the welding jig 4 is removed, and the welded welding body a is cut according to the product design structure to form an integral product of the base 2 having a solid structure and the metal fin 1, as shown in fig. 6.
In the welding method for vacuum brazing of metal plates and metal fins, in the preferred embodiment, in the step one, the composite soldering lug 3 is a structure in which two side surfaces of a metal plate are coated with solder layers, and the bottom surface of the composite soldering lug 3 is flush with the bottom surface of the metal fin 1 in the vertical direction of the stiffness 11, and the composite soldering lug 3 and the metal fin 1 are combined to form a solid structure; a fin structure connected with the solid structure is formed above the composite soldering lug 3; according to the design requirement of a product, the bottom of the metal fin 1 is designed to be a base part with a solid structure, therefore, the composite soldering lug 3 is inserted into the bottom of the metal fin 1, so that the base 2 with the solid structure can be directly formed at the bottom after welding, and after welding is completed, the protruding composite soldering lug 3 is cut.
In the above-mentioned welding method for vacuum brazing of metal plates and metal fins, in the first preferred embodiment, in the step one, positioning pin holes 31 which are mutually communicated are provided in all the composite welding pieces 3 which protrude from both side surfaces of the metal fin 1, and positioning pins 32 are inserted into the positioning pin holes 31 to position the composite welding pieces 3. Therefore, all the composite welding sheets 3 are positioned, and the condition that the assembly of the composite welding sheets 3 is uneven and the subsequent assembly and the product forming are influenced is prevented.
In the preferred embodiment of the welding method for vacuum brazing the metal plate and the metal fin, before the first step, a step of pre-drilling a bolt head hole on the metal fin 1 according to the requirement of providing the bolt head hole 12 on the product is further included, in the step, the bolt head hole 12 is drilled from the top surface of the metal fin 1 along the height direction of the force 11 and is drilled to the top surface of the composite welding lug 3. Referring to fig. 4, according to the design requirement of the product, a bolt head hole 12 is required to be formed on the metal fin 1 for accommodating the bolt head of the bolt. In order to ensure that the formed bolt head hole 12 does not influence the effect of vacuum welding, a pre-punching step is required, the depth of the bolt head hole 12 is the height of the metal fin 1 except the part where the composite soldering lug 3 is inserted, namely, the bolt head hole 12 is only opened to the top surface of the composite soldering lug 3 and is not processed to a welding position, and a hole opening operation is not carried out on the strength 11 in contact with the composite soldering lug 3, so that the welding seam between the composite soldering lugs 3 can be prevented after part of the strength 11 is processed and removed after welding. After the welding is completed, bolt holes can be machined in the base part of the solid structure through the bolt head holes 12, so that the bolt holes and the bolt head holes 12 form a countersunk structure for connecting the radiator to other heat-generating equipment through bolts.
In the welding method for vacuum brazing of metal plates and metal fins as described above, in the preferred embodiment, in the step of pre-drilling the screw holes, the metal fins 1 are fixed by using the metal fin drilling jig 5, which is provided between the upper and lower clamping plates 51 and 52 and is inserted into the space between the forces 11 to fix the plates 511 and 521 at a distance from each force 11, and the metal fins 1 are drilled by using the drilling device 6 at the drilling holes reserved in the upper or lower clamping plate 51 or 52. Referring to fig. 7, the metal fin punching jig 5 includes an upper plate 51 and a lower plate 52, wherein the upper plate 51 and the lower plate 52 are respectively provided with protruding spaced fixing plates 511 and 521 arranged in parallel, and the thickness of the spaced fixing plates 511 and 521 is equal to the distance between the forces 11, so as to be inserted into the space between the forces 11 to support and position the forces 11, thereby preventing the forces 11 from bending and deforming due to external force. In a preferred embodiment, corresponding to the S-shaped structure that may be used to fold the metal fins, the spacing fixing plates 511 and 521 may be spaced apart from each other on the upper clamping plate 51 and the lower clamping plate 52 to form the teeth-shaped structures that are engaged with each other. And the upper splint 51 or the lower splint 52 can be provided with a punching hole for installing the punching equipment 6, and the punching equipment 6 is installed on the punching hole to punch the metal fin 1. Of course, the metal fin punching clamp 5 at the punching position is not provided with a spacing fixing plate. In a preferred embodiment, the punching device 6 may be an electric discharge machine or the like.
According to the welding structure and the welding method for vacuum brazing of the metal plate and the metal fin, the metal plate and the metal fin are skillfully matched, so that a welding main body formed by the metal plate and the metal fin can obtain higher welding quality and welding strength after welding, and the welding structure and the welding method are simple in structure, convenient to operate and low in cost; particularly, the problems that the machining quality is low and the fins are easy to damage in the machining of the metal fins which are dense and thin in the traditional welding structure and method are solved.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (8)
1. A welding structure for vacuum brazing of a metal plate and a metal fin comprises the metal fin and is characterized by further comprising the metal plate and a welding flux layer; the metal fin is an integral folding metal fin formed by arranging a plurality of forces in parallel at intervals; the welding flux layer is arranged on two sides of the metal plate to form composite welding sheets, the composite welding sheets are respectively inserted into intervals among the power bodies to form a welding main body, the thickness of each composite welding sheet is equal to the interval among the power bodies, the height of each composite welding sheet is smaller than that of each metal fin, and the length of each composite welding sheet is larger than that of each metal fin; the welding structure for vacuum brazing of the metal plate and the metal fin further comprises a welding clamp for clamping and fixing the welding main body, wherein the welding clamp comprises a clamping structure for clamping and fixing two side surfaces, parallel to the composite soldering lug, of the welding main body; the thickness of the part of the metal plate protruding out of the metal fin is the sum of the spacing distance between the stiffeners and the thickness of the stiffeners, and the shape of the part is T-shaped or L-shaped; the solder layers are arranged on two sides of the metal plate part between the parts of the two ends of the metal plate protruding out of the metal fins, and the parts of the metal plate protruding out of the metal fins are not provided with the solder layers;
The metal fin punching clamp comprises an upper clamp plate and a lower clamp plate, wherein the upper clamp plate and the lower clamp plate are arranged oppositely and used for clamping the metal fins, space fixing plates are respectively arranged on one opposite sides of the upper clamp plate and the lower clamp plate and are inserted into the spaces of the metal fins, and the thickness of each space fixing plate is equal to the space between the stiffeners; punching holes are formed in the upper clamping plate or the lower clamping plate, and punching equipment is mounted on the punching holes; and the inner side of the position of the punching hole is not provided with a spacing fixing plate.
2. A welded structure according to claim 1, wherein the composite lug is an integral structure formed by coating a solder layer on the metal plate; the composite soldering lug is fixed to the middle part of the metal fin.
3. A welded structure by vacuum brazing a metal plate and a metal fin according to claim 2, wherein all of said composite lugs outside of both end portions of said metal fin are provided with positioning pin holes communicating with each other, and positioning pins are inserted into said positioning pin holes.
4. The welded structure of vacuum brazing a metal plate to a metal fin according to any one of claims 1 to 3, wherein said welding jig comprises:
The fixing plate is parallel to the first side face of the welding main body and is arranged in close fit with the first side face;
the two limiting plates are perpendicular to the fixing plate, one end parts of the two limiting plates are fixed at two ends of the fixing plate, and the two limiting plates are close to two side surfaces of the welding main body formed by two ends of the composite welding sheet;
The fixed pressing plate is arranged opposite to the fixed plate and fixed at the other end parts of the two limiting plates, a plurality of compression bolts are arranged on the fixed pressing plate, a backing plate clinging to the second side surface opposite to the first side surface of the welding main body is arranged on the inner side of the fixed pressing plate, and the backing plate is compressed to the welding main body by the compression bolts;
and the contact surfaces of the welding clamp and the welding main body are coated with anti-adhesion layers for preventing the adhesion of the welding materials.
5. a welding method for vacuum brazing of metal plates and metal fins is characterized by comprising the following steps:
respectively inserting a plurality of composite soldering lugs between adjacent stiffening forces of a metal fin to form a welding main body, wherein the thickness of each composite soldering lug is equal to the distance between the adjacent stiffening forces; the metal fin is an integral folding metal fin formed by arranging a plurality of forces in parallel at intervals; the welding flux layer is arranged on two sides of the metal plate to form composite welding sheets, the composite welding sheets are respectively inserted into the intervals between the strength to form a welding main body, the height of the welding main body is smaller than that of the metal fin, and the length of the welding main body is larger than that of the metal fin; the thickness of the part of the metal plate protruding out of the metal fin is the sum of the spacing distance between the stiffeners and the thickness of the stiffeners, and the shape of the part is T-shaped or L-shaped; the solder layers are arranged on two sides of the metal plate part between the parts of the two ends of the metal plate protruding out of the metal fins, and the parts of the metal plate protruding out of the metal fins are not provided with the solder layers;
Clamping the outer side surface of the part, provided with the composite soldering lug, of the welding main body by using a welding fixture to form a welding structure for vacuum brazing of the metal plate and the metal fin;
Thirdly, putting the welding structure of the metal plate and the metal fin in vacuum brazing into a vacuum brazing furnace for welding;
taking out the welding structure of the metal plate and the metal fin in vacuum brazing, detaching the welding fixture, and cutting and processing the welded welding structure of the metal plate and the metal fin in vacuum brazing according to the product design structure to form an integral product of a base with a solid structure and the metal fin;
And a pre-step before the first step, namely pre-drilling a bolt head hole on the metal fin according to the requirement of arranging the bolt head hole on a product, wherein in the step, the bolt head hole is formed from the top surface of the metal fin along the height direction of the strength and is formed to the top surface of the composite soldering lug; the metal fin punching clamp comprises an upper clamp plate and a lower clamp plate, wherein the upper clamp plate and the lower clamp plate are arranged oppositely and used for clamping the metal fin, space fixing plates are respectively arranged on one opposite sides of the upper clamp plate and the lower clamp plate and are inserted into intervals of the metal fin, and the thickness of each space fixing plate is equal to the distance between the stiffeners; punching holes are formed in the upper clamping plate or the lower clamping plate, and punching equipment is mounted on the punching holes; and the inner side of the position of the punching hole is not provided with a spacing fixing plate.
6. A welding method for vacuum brazing a metal plate and a metal fin according to claim 5, wherein in the first step, the composite lug is a structure in which two side surfaces of the metal plate are coated with solder layers, and the bottom surface of the composite lug is flush with the bottom surface of the metal fin in the vertical direction of the stiffness of the metal fin, and the composite lug and the metal fin are combined to form a solid structure; and a fin structure connected with the solid structure is formed above the composite soldering lug.
7. A method for welding a metal plate and a metal fin by vacuum brazing, according to claim 6, wherein in the first step, the method further comprises providing positioning pin holes which are communicated with each other in all the composite welding pieces which protrude from both side surfaces of the metal fin, and positioning the composite welding pieces by inserting positioning pins into the positioning pin holes.
8. a welding method for vacuum brazing of metal plates and metal fins according to claim 7, wherein in the step of pre-drilling the bolt head holes, the metal fins are fixed by using a metal fin drilling jig which is provided between an upper clamping plate and a lower clamping plate and is inserted into the space between the forces and is used for separating the space fixing plates of the forces, and the metal fins are drilled by using a drilling position reserved on the upper clamping plate or the lower clamping plate by using a drilling device.
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