JP3577563B2 - Flux coating device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for continuously applying a flux to one surface of a plate-shaped metal material used by being brazed, for example, in a capacitor, an evaporator, an oil cooler or the like used for an automobile. In this specification, the term “aluminum” includes an aluminum alloy in addition to pure aluminum.
[0002]
2. Description of the Related Art
As a method of applying a brazing flux to a metal material, for example, an aluminum material, a dipping method, a shower spraying method, or an electrostatic coating method is generally widely used. Even if the method is applied to the method, when the flux is applied to only one surface of the plate-like aluminum material, it is necessary to mask the non-applied surface, and there is a problem that the operation is troublesome. In addition, there is a problem that it is difficult to control the amount of application in any of the methods and the process management is also difficult, and it is not possible to apply the coating uniformly and evenly. In addition, since it is difficult to control the amount of application by any of the methods, it is necessary to apply an excessive amount of flux in order to make sure that there is no unapplied portion, and the amount of used flux increases, resulting in cost reduction. There is a problem of becoming high. Further, if an excessive flux is applied, the amount of adhering moisture increases, and there is a problem that it takes time to dry in a subsequent process.
[0003]
As a method of applying a flux to only one surface of a plate-like aluminum material, there is an unusual method, but an automatic brush coating method. However, this method also has a problem that it is difficult to control the amount of application, and furthermore, the brush is deteriorated, the hair falls off, adheres to the plate-shaped aluminum material, and impairs the brazing property. In addition, even with this method, there is a problem that the coating cannot be performed uniformly.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to easily apply a flux to one surface of a plate-like metal material, and to easily control the amount of application, to simplify the process management, and to uniformly apply the flux. It is an object of the present invention to provide a flux coating device which can be used.
[0005]
Means for Solving the Problems and Effects of the Invention
Claim 1The flux coating device according to the invention is:It has an irregular cross-section consisting of a flat plate-like part and rising walls integrally formed on both side edgesSheet metal materialUpper surface of the plate-shaped part atIs a device for applying flux continuously to an application roll and a backup roll arranged so as to sandwich a plate-shaped metal material from both sides, a tank for holding a flux suspension, and a part of the tank. A pickup roll immersed in the flux suspension and supplying the flux suspension to the application roll,In the middle part of the length of the peripheral surface of the application roll, it has an axial length equal to the distance between the rising walls of the sheet metal material and a protruding height equal to the height of the rising walls, and has a cylindrical surface. An annular ridge that fits between the rising walls and is in surface contact with the entire upper surface of the plate-shaped portion is formed over the entire circumference. An annular groove into which the material fits is formed over the entire circumference,The application roll rotates in an arbitrary direction.
[0006]
According to a second aspect of the present invention, there is provided a flux coating apparatus, wherein a flux is continuously formed on a lower surface of a plate-like portion of a plate-like metal material having a deformed cross section composed of a flat plate-like portion and hanging walls integrally formed on both side edges thereof. An application roll and a backup roll arranged so as to sandwich a plate-shaped metal material from both sides, a tank for holding a flux suspension, and a part of the flux suspension in the tank. A pickup roll immersed in the application roll and supplying the flux suspension to the application roll. It has a projection length equal to the length in the direction and the height of both hanging walls, has a cylindrical peripheral surface, fits between both hanging walls, and has an entire lower surface of the plate-like portion. An annular ridge that makes surface contact is formed over the entire circumference, and an annular groove into which a plate-shaped metal material is fitted is formed over the entire circumference in the middle part of the length of the peripheral surface of the backup roll. It is made to rotate to.
[0007]
The flux to be applied in the above case is K when the plate-like metal material is made of aluminum._nAlF_{n + 3}(Where n is a natural number), KF and AlF₃And a fluoride-based flux such as a potassium fluoroaluminate complex, or a mixture thereof. It is preferable that the particle size of such a flux has a particle size distribution of 1 to 100 μm. The application of the flux is performed by applying a flux suspension obtained by suspending the above-mentioned flux in water to a plate-shaped metal material, and then drying it.
[0008]
ADVANTAGE OF THE INVENTION According to the flux application apparatus of this invention, the application roll and the backup roll arrange | positioned so that a plate-shaped metal material may be sandwiched from both surfaces, the tank which stores a flux suspension, and a part of the flux suspension in a tank. A pickup roll that is immersed in the liquid and supplies the flux suspension to the application roll, so that the flux suspension in the tank is supplied to the application roll by the pickup roll, and the flux suspension is supplied by the application roll. Since the coating can be applied to one side of the plate-shaped metal material, it is not necessary to apply masking to the non-applied surface, which simplifies the operation. Further, since the flux suspension is applied to the plate-shaped metal material by the application roll, it is possible to apply the flux suspension uniformly and evenly. Furthermore, since it is applied only to one side of the sheet metal material that is required, the appearance after brazing this sheet metal material becomes beautiful, and there is no extra flux, so the weight of the brazed product is reduced. Can be achieved. In addition, there is no hindrance to brazing unlike the conventional automatic brush coating method.
[0009]
In addition, since the application roll rotates in an arbitrary direction, the amount of application can be reduced by setting the rotation direction to the same direction as the traveling direction of the sheet metal material, and the rotation direction is also changed to the plate direction. The application amount can be increased by making the direction opposite to the traveling direction of the metallic metal, so that the application amount can be easily controlled and the process management can be simplified. In addition, the amount of application can be minimized, the amount of flux used is reduced, and the cost is reduced. Further, by minimizing the amount of application, the amount of adhering water is also reduced, and the time required for drying in the subsequent process is reduced. Moreover, the film thickness of the coating film can be increased by setting the rotation direction of the application roll opposite to the direction in which the plate-shaped metal material advances.
[0010]
thisIn the flux coating apparatus of the present invention, at least one or more transfer rolls are interposed between the pickup roll and the application roll, and the pickup roll, the application roll, and the transfer roll are each independent of the rotation direction of the other roll. It may be made to rotate in any direction. In this case, when the two adjacent rolls are rotated in opposite directions, the amount of the flux suspension transferred between the two rolls is reduced, and when the two adjacent rolls are rotated in the same direction, the flow between the two rolls is reduced. The delivery amount of the flux suspension increases. Therefore, by appropriately combining the rotation directions of the rolls, it is possible to adjust the supply amount of the flux suspension to the application rolls, thereby controlling the flux application amount.
[0011]
AboveTapiIn an apparatus in which at least one or more transfer rolls are interposed between a backup roll and an application roll, it is preferable that one of two rolls in contact with each other is made of metal and the other is made of rubber. In this case, the amount of wear of the rolls is smaller than when all the rolls are made of metal. As the metal roll, for example, a roll made of stainless steel and the surface thereof is plated with chrome is used. As the rubber roll, a roll made of hard rubber is used, for example. Further, the surface hardness of the metal roll is preferably 50 or more in Rockwell B hardness, and the surface roughness is preferably 30 μm or less in center line average roughness Ra.
[0012]
In the flux coating apparatus of the present invention, the pick-up roll and the application roll are in direct contact with each other, and both rolls are configured to rotate in any direction regardless of the rotation direction of the other rolls. There is. In this case, when the pickup roll and the application roll are rotated in opposite directions, the supply amount of the flux suspension from the pickup roll to the application roll decreases, and when the pickup roll is rotated in the same direction, the supply amount increases. Also makes it possible to control the amount of flux applied.
[0013]
Even in such an apparatus in which the pickup roll and the application roll are in direct contact, it is preferable that one of the two rolls in contact with each other is made of metal and the other is made of rubber. In this case, the amount of wear of the rolls is smaller than when all the rolls are made of metal. As the metal roll, for example, a roll made of stainless steel and the surface thereof is plated with chrome is used. As the rubber roll, a roll made of hard rubber is used, for example. The surface hardness of the metal roll is preferably 50 or more in Rockwell B hardness. Preferably, the surface roughness is not more than 30 μm in center line average roughness Ra..
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a first embodiment of the device according to the invention.
[0016]
In FIG. 1, a flux coating device (100) applies a flux only to the upper surface of a plate-like aluminum material (A) (plate-like metal material), and sandwiches the plate-like aluminum material (A) from both upper and lower surfaces. Application roll (101) and backup roll (102), a tank (104) for holding the flux suspension (103), and a part of the flux suspension (103) in the tank (104). A pickup roll (105) immersed therein and supplying the flux suspension (103) to the application roll (101).
[0017]
At least one or more, in this embodiment, two transfer rolls (106) and (107) are interposed between the pickup roll (105) and the application roll (101). Then, the pickup roll (105) and the first transfer roll (106), the adjacent first and second transfer rolls (106) (107), and the second transfer roll (107) and the application roll (101) And contact each other. Here, the pickup roll (105) and the second transfer roll (107) are each made of metal, and the first transfer roll (106) and the application roll (101) are each made of rubber.
[0018]
The pickup roll (105), the application roll (101), and the two transfer rolls (106) and (107) are configured to rotate in any directions irrespective of the rotation directions of the other rolls in contact therewith. In this embodiment, the rolls (105), (101), (106), and (107) rotate in the directions indicated by arrows. That is, the pickup roll (105), the application roll (101), and the two transfer rolls (106) and (107) rotate in the same direction, respectively, and the application roll (101) rotates in the opposite direction to the traveling direction of the plate-shaped aluminum material (A). Since it rotates in the direction, the application amount of the flux suspension to the plate-like aluminum material (A) increases. The backup roll (102) rotates in the same direction as the traveling direction of the plate-shaped aluminum material (A) as shown by the arrow.
[0019]
In such a configuration, the plate-shaped aluminum material (A) is continuously fed to the right side of FIG. 1 by passing between the application roll (101) and the backup roll (102) by a pair of feed rolls (108). Sent. The flux suspension (103) wound up from the tank (104) by the pickup roll (105) is sent to the application roll (101) via two transfer rolls (106) and (107), and is sent to the application roll (101). Apply to the top surface of plate-shaped aluminum material (A)Be done.
[0020]
In FIG.As shown, plate-shaped aluminum material (A)Is flatUnusual cross-section product consisting of a plate-shaped part (a) and a rising wall (b) integrally formed on both side edgesIt is. in this case,In the middle of the length of the peripheral surface of the application roll (101), an axial length equal to the distance between the rising walls (b) of the plate-shaped aluminum material (A) and the height of the rising walls (b) are set. An annular ridge (109) which has the same protruding height and has a cylindrical peripheral surface, in other words, is fitted between the upstanding walls (b) and is in surface contact with the entire upper surface of the plate-like portion (a). Are formed over the entire circumference. Further, an annular groove (110) into which the plate-shaped aluminum material (A) fits is formed over the entire circumference at a middle portion of the length of the peripheral surface of the backup roll (102).
[0021]
FIG. 3 shows a second embodiment of the device according to the invention.
[0022]
In FIG. 3, the flux applying device (111) applies the flux only to the lower surface of the plate-shaped aluminum material (A), and is arranged so as to sandwich the plate-shaped aluminum material (A) from the lower surface side and the upper surface side. Application roll (112) and a backup roll (113), and a pick-up roll (114) that is in direct contact with the application roll (112). A part of the pickup roll (114) is immersed in the flux suspension (103) in the tank (104), as in the first embodiment.
[0023]
Here, the pickup roll (114) is made of metal, and the application roll (112) is made of rubber.
[0024]
The pickup roll (114) and the application roll (112) are configured to rotate in any directions regardless of the rotation directions of the other rolls. In this embodiment, each of the rolls (114) (112) rotates in the direction indicated by the arrow. That is, the pickup roll (114) and the application roll (112) rotate in the same direction, and the application roll (112) rotates in the direction opposite to the traveling direction of the plate-shaped aluminum material (A). The amount of the flux suspension applied to the plate-like aluminum material (A) increases. The backup roll (113) rotates in the same direction as the traveling direction of the plate-shaped aluminum material (A) as shown by the arrow.
[0025]
In such a configuration, the plate-like aluminum material (A) passes between the application roll (112) and the backup roll (113) by means of a pair of feed rolls (108) and continuously flows to the right in FIG. Sent. The flux suspension (103) wound up from the tank (104) by the pickup roll (114) is sent to the application roll (112), and is applied to the lower surface of the plate-like aluminum material (A) by the application roll (112).Be done.
[0026]
In FIG.As shown, plate-shaped aluminum material (A)Is flatA cross-sectional product consisting of a plate-shaped part (a1) and a hanging wall (b1) integrally formed on both side edgesis there. in this case,In the middle part of the length of the peripheral surface of the application roll (112), an axial length equal to the distance between the two hanging walls (b1) of the plate-shaped aluminum material (A) and a projecting height equal to the height of the both hanging walls are provided. In other words, an annular ridge (115) that fits between both hanging walls (b1) and makes surface contact with the entire lower surface of the plate-shaped portion (a1) Formed over Further, an annular groove (116) into which the plate-shaped aluminum material (A) fits is formed over the entire circumference in the middle part of the length of the peripheral surface of the backup roll (113).
[0027]
Hereinafter, a specific plate-like metal material to which a flux is applied by the apparatus of the present invention will be described.
[0028]
FIG. 5 shows a condenser having an aluminum flat tube made up of two aluminum components to which a flux is applied and brazed after being applied by the apparatus of the present invention as a refrigerant flow tube, and FIG. 6 shows a refrigerant flow tube. FIG. 7 shows upper and lower components constituting the flat tube.
[0029]
In FIG. 5, the capacitors are an inlet header (1) and an outlet header (2) arranged in parallel with each other at an interval from each other, and a parallel-shaped capacitor having both ends connected to both headers (1) and (2). A flat refrigerant flow pipe (3) and an aluminum corrugated fin (4) arranged in a ventilation gap between adjacent refrigerant flow pipes (3) and brazed to both refrigerant flow pipes (3) , An inlet pipe (5) connected to the upper end of the peripheral wall of the inlet header (1), and an outlet pipe (6) connected to the lower end of the peripheral wall of the outlet header (2). The gas-phase refrigerant flowing into the header (1) is diverted to each refrigerant flow pipe (3), flows rightward, reaches the outlet header (2), and flows out of the outlet pipe (6) as a liquid phase. It has become.
[0030]
As shown in FIG. 6, the refrigerant flow pipe (3) is made up of flat upper and lower walls (7) and (8), and a double-structure left and right side wall (9) that spans the left and right edges of the upper and lower walls (7) and (8). ) (10) and a plurality of reinforcing walls (11) extending between the left and right side walls (9) and (10), extending in the longitudinal direction and extending at a predetermined distance from the upper and lower walls (7) and (8). ), And an aluminum flat tube (T1) having a parallel fluid passage (12) inside. The flat tube (T1) is composed of an aluminum plate-shaped lower component (13) constituting the lower wall (8), the left and right side walls (9) (10) and the reinforcing wall (11), the upper wall (7) and the left and right. It is formed by an aluminum plate-shaped upper component member (14) constituting both side walls (9) and (10).
[0031]
The left and right side walls (9) and (10) are a hanging wall (15) integrally formed on the left and right side edges of the upper wall (7), and a rising wall (16) integrally formed on the left and right side edges of the lower wall (8). ) Are formed by brazing each other in a state where the hanging walls (15) are overlapped with each other on the outside. The lower end of the hanging wall (15) extends below the lower wall (8), and is bent inward to form inclined surfaces (17) formed on the left and right side edges of the lower surface of the lower wall (2). ) And brazed.
[0032]
The reinforcing wall (11) is formed by joining a reinforcing wall forming portion (18) integrally formed with the lower wall (8) to the inner surface of the upper wall (7). The reinforcing wall (11) is provided with a plurality of communication holes (19) through which the parallel fluid passages (12) pass. The communication holes (19) are arranged in a zigzag pattern when viewed from a plane. When the communication holes (19) are provided, the fluid flowing through the parallel fluid passages (12) flows in the width direction of the flat tube (T1) through the communication holes (19), and all the fluid passages (12 ), And there is no temperature difference in the fluid between the fluid passages (12). Therefore, the heat exchange efficiency is improved. The communication hole (19) is formed by notches (20) formed at predetermined intervals on the upper edge of the reinforcing wall forming portion (18), the opening of which is closed by the upper wall (7). Things. In this case, since the communication holes (19) formed in the plurality of reinforcing walls (11) are staggered when viewed from the plane, the two component members (13) (14) are arranged in the width direction of the flat tube (T1). ) Since there is a joint between the two, sufficient joint strength is secured.
[0033]
The flat tube (T1) constituting the refrigerant flow tube (3) is fitted with a plate-shaped lower aluminum component (13) and a plate-shaped aluminum upper component (14) as shown in FIG. It is manufactured by brazing together.
[0034]
The lower component (13) includes a flat lower wall forming portion (21), a rising wall (16) integrally formed on both side edges of the lower wall forming portion (21), and a lower wall forming portion (13). A plurality of reinforcing wall forming portions (18) extending in the longitudinal direction integrally formed in a rising shape between both rising walls (16) and at a predetermined interval from each other, and the reinforcing wall forming portion (18) Trapezoidal notches (20) are formed in the upper edge at predetermined intervals in the length direction so as to be staggered when viewed from a plane. An inclined surface (17) that is inclined upward and outward in the left-right direction is formed on left and right side edges on the lower surface of the lower wall forming portion (21) of the lower component member (13). The height of both rising walls (16) of the lower component (13) is equal to the height of the reinforcing wall forming portion (18). The lower component (13) is made of an aluminum brazing sheet having a brazing material layer (not shown) on one surface, that is, on the lower surface of the lower wall forming portion (21) and the outer surface of the rising wall (16).
[0035]
The upper component member (14) includes a flat upper wall forming part (22) and a hanging wall (15) integrally formed on both side edges of the upper wall forming part (22). The width of the upper wall forming portion (22) of the upper component (14) is slightly larger than the width of the lower component (13), and can be covered by the lower component (13). The hanging length of both hanging walls (15) of the upper component (14) is slightly larger than the height of the upstanding walls (16) of the lower component (13). The upper component member (14) is made of an aluminum brazing sheet having a brazing material layer (not shown) on both surfaces, that is, both upper and lower surfaces of the upper wall forming portion (22) and both inner and outer surfaces of both hanging walls (15).
[0036]
In brazing the upper and lower constituent members (14) and (13), after these are subjected to a degreasing treatment, a brazing flux is applied by the apparatus of the present invention. That is, a device in which the peripheral surfaces of the application roll (101) and the backup roll (102) are entirely cylindrical in order to apply the lower component (13) to a flat plate with the configuration shown in FIG. The flux is applied between the application roll (101) of (100) and the backup roll (102), and a flux is applied to the upper end surfaces of the upstanding wall (16) and the reinforcing wall forming portion (18). Further, the upper component member (14) is combined with the application roll (112) of the device (111) having the configuration shown in FIG. 3 and having the application roll (112) and the backup roll (113) as shown in FIG. The flux is applied to the lower surface of the upper wall forming portion (22) by passing the flux through the space between the backup roll (113).
[0037]
Then, after fitting the upper component (14) to the lower component (13), the upper component (14) has both hanging walls (15) than the lower riser wall (16) of the lower component (13). The downwardly protruding portion is bent inward to make close contact with the inclined surface (17) of the lower component member (13), and the two component members (14) and (13) are temporarily fixed while applying a force from above and below. Thereafter, the two members (14) and (13) temporarily fixed are heated to a brazing temperature, so that the upper ends of the both rising walls (16) of the lower member (13) and the upper wall of the upper member (14) are heated. Forming part (22) is brazed to both left and right ends of the lower surface, and the upper end of the reinforcing wall forming part (18) is brazed to the lower surface of the upper wall forming part (22) of the upper constituent member (14). ) And the rising wall (16) of the lower component (13) are brazed to the lower component (13) and the bent portion of the lower end of the lower wall (15) of the upper component (14) is attached to the lower component (13). ) Is brazed to the inclined surface (17) with a lap joint.
[0038]
FIG. 8 shows a first modified example of a flat tube which is composed of two aluminum component members to which a flux is applied and brazed after being applied by the apparatus of the present invention, and which constitutes a refrigerant flow tube. FIG. 9 shows this flat tube. The upper and lower component members that constitute are shown.
[0039]
In FIG. 8, an aluminum flat tube (T2) has a plurality of protruding ridges (30) extending in the length direction integrally formed on the inner surface of an upper wall (7) in order to increase a heat transfer area. A plurality of protrusions (31) are spaced apart in the longitudinal direction at the portion between the adjacent reinforcing walls (11) on the inner surface of the lower wall (8) to increase the heat transfer area. It is formed integrally in a shape. Other configurations are the same as those shown in FIG.
[0040]
The flat tube (T2) is manufactured by fitting and brazing a plate-like aluminum lower component (13) and a plate-like aluminum upper component (14) as shown in FIG. You.
[0041]
The lower component (13) has a projection (31) integrally formed on the upper surface of the lower wall forming portion (21), and the upper component (14) has a long surface on the lower surface of the upper wall forming portion (22). A plurality of ridges (30) extending in the vertical direction are formed integrally with each other at intervals in the left-right direction and in a downwardly protruding shape over the entire width except for predetermined width portions at both right and left ends. Therefore, on the lower surface of the upper wall forming portion (22), at least one ridge (30) exists at a portion corresponding to each reinforcing wall forming portion (18) of the lower component (13). Since the ridges (30) are formed simultaneously with the rolling of the upper component (14), the thickness of the brazing material layer at the ridges (30) is greater than at the other portions. Other configurations of the upper and lower constituent members (14) and (13) are the same as those shown in FIG.
[0042]
In brazing the upper and lower constituent members (14) and (13), after these are subjected to a degreasing treatment, a brazing flux is applied by the apparatus of the present invention. That is, a device in which the peripheral surfaces of the application roll (101) and the backup roll (102) are entirely cylindrical in order to apply the lower component (13) to a flat plate with the configuration shown in FIG. The flux is applied between the application roll (101) of (100) and the backup roll (102), and a flux is applied to the upper end surfaces of the upstanding wall (16) and the reinforcing wall forming portion (18). Further, the upper component member (14) is combined with the application roll (112) of the device (111) having the configuration shown in FIG. 3 and having the application roll (112) and the backup roll (113) as shown in FIG. The flux is applied to the lower surface of the upper wall forming portion (22) and the tip end surface of the ridge (30) by passing through the space between the backing roll (113). Then, the upper and lower structural members (14) and (13) are brazed in the same manner as in the case of the flat tube (T1) shown in FIG.
[0043]
However, after the upper component member (14) is fitted over the lower component member (13), the both hanging walls (15) of the upper component member (14) are higher than the both rising walls (16) of the lower component member (13). When the part protruding downward is bent inward and brought into close contact with the inclined surface (17) of the lower component (13), and the two components (14) and (13) are temporarily fixed while applying force from above and below. The upper wall forming portion (22) of the upper component (14) due to various differences in the height position of the upper edge of the portion (32) between the adjacent notches (20) in the reinforcing wall forming portion (18). ) Even if there is a gap between the upper wall and the lower surface, the upper edge of each portion (32) is in close contact with the ridge (30) on the lower surface of the upper wall forming portion (22). If the size of the gap is smaller than the protruding height of the ridge (30), the ridge (30) is deformed. Furthermore, when the two members (14) and (13) are temporarily fixed and heated to the brazing temperature, the upper end of the reinforcing wall forming portion (18) of the lower member (13) is brazed to the ridge (30). Is done. Since the thickness of the brazing material layer at the ridge (30) is thicker than at the other portions, the molten brazing material is easily drawn to this portion during brazing, and the reinforcing wall forming portion (18) ) And the gap between the two ridges (30)Be blocked.
[0044]
As mentioned above,Flat tube (T1)(T2) ToWhen the apparatus of the present invention is used for applying a flux during production, it is possible to apply an even thin film with a minimum application amount, so that the obtained flat tube (T1)(T2) ofThe flux residue inside can be reduced as much as possible.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a first embodiment of a flux coating device according to the present invention.
FIG. 2 is an apparatus for applying a flux to a plate-shaped aluminum material, which is a device of the first embodiment, which is a deformed cross-sectional product having a flat plate-like portion and rising walls integrally formed on both side edges thereof. FIG. 4 is a vertical vertical sectional view showing a configuration of a roll and a backup roll.
FIG. 3 is a schematic configuration diagram showing a second embodiment of the flux coating device according to the present invention.
FIG. 4 is an application for applying a flux to a plate-shaped aluminum material, which is a device of the second embodiment, which is a profiled product having a flat plate-like portion and a hanging wall integrally formed on both side edges thereof. FIG. 4 is a vertical vertical sectional view showing a configuration of a roll and a backup roll.
FIG. 5 is a front view showing a condenser including, as a refrigerant flow pipe, a flat aluminum pipe made of two aluminum constituent members to which a flux is applied and brazed after being applied by the apparatus of the present invention.
FIG. 6 is a cross-sectional view showing a flat tube constituting a refrigerant flow tube.
FIG. 7 is a partial perspective view showing upper and lower components constituting the flat tube of FIG. 6;
FIG. 8 is a cross-sectional view showing a first modified example of a flat tube constituting a refrigerant flow tube.
9 is a partial perspective view showing upper and lower components constituting the flat tube of FIG. 8;It is.
[Explanation of symbols]
(100) (111): Flux coating device
(101) (112): Application role
(102) (113): Backup roll
(103): Tank
(104): flux suspension
(105) (114): Pickup roll
(A): Aluminum plate (metal plate)

Claims (4)

An apparatus for continuously applying a flux to an upper surface of a plate-shaped portion of a plate-shaped metal material having an irregular cross-section comprising a flat plate-shaped portion and rising walls integrally formed on both side edges thereof , comprising: Application roll and backup roll arranged so that the material is sandwiched from both sides, a tank for holding the flux suspension, and a part of which is immersed in the flux suspension in the tank and applies the flux suspension to the application roll. And a pickup roll for supplying the same to the middle part of the length of the peripheral surface of the application roll, and an axial length equal to the interval between the rising walls of the plate-shaped metal material and a height equal to the height of the rising walls. An annular ridge that has a protruding height and has a cylindrical peripheral surface and fits between both rising walls and makes surface contact with the entire upper surface of the plate-shaped portion Over is formed, the length middle portion of the peripheral surface of the backup roll, circle annular groove fitting of the plate-shaped metal material is formed over the entire periphery, the application roll is adapted to rotate in any direction Flux coating device. An apparatus for continuously applying a flux to a lower surface of a plate-shaped portion of a plate-shaped metal material having an irregular cross section composed of a flat plate-shaped portion and a hanging wall integrally formed on both side edges thereof, comprising: An application roll and a backup roll that are arranged so that the material is sandwiched from both sides, a tank that holds the flux suspension, and a part that is immersed in the flux suspension in the tank and applies the flux suspension to the application roll. And a pickup roll for supplying the same to the middle part of the length of the peripheral surface of the application roll, the axial length equal to the distance between the two hanging walls of the plate-shaped metal material and the height equal to the height of the both hanging walls. An annular ridge having a protruding height, a circumferential surface being cylindrical, and being fitted between both hanging walls and being in surface contact with the entire lower surface of the plate-like portion is formed over the entire circumference. , The length middle portion of the peripheral surface of the backup roll, circle annular groove fitting of the plate-shaped metal material is formed over the entire circumference, fluxing apparatus application roll is adapted to rotate in any direction. At least one transfer roll is interposed between the pickup roll and the application roll, so that the pickup roll, the application roll, and the transfer roll rotate in any directions regardless of the rotation direction of the other rolls. The flux coating device according to claim 1 or 2, wherein: The flux coating device according to claim 3 , wherein one of the two rolls in contact with each other is made of metal and the other is made of rubber.

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