JP2790890B2 - Method of manufacturing header pipe for heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a heat exchanger, for example, a header pipe which is a component of a condenser for various cooling devices, a radiator for a vehicle, or the like.

(Prior Art) Conventionally, as a method for manufacturing this type of header pipe, a second method has been described.
The one shown in the figure is known (JP-A-63-49193).

In this manufacturing method, a connection hole 3 for inserting and connecting a heat exchange tube 2 is formed in a header pipe material 1 formed in a cylindrical shape in advance, and a partition plate 4 for partitioning the header pipe material 1 is inserted. The hole 5 is punched. After that, the connection hole 3
, The heat exchange tube 2 is inserted, the partition plate 4 is inserted into the insertion hole 5, and the partition plate 4 is temporarily fixed. After the temporary fixing, the brazing partition plate 4 is fixed to the header pipe blank 1.

(Problems to be Solved by the Invention) As described above, in the conventional method for manufacturing a header pipe, the insertion hole 5 for inserting the partition plate must be provided, and this hole making process is indispensable. The insertion hole 5 is large enough to insert the insertion portion 6 of the partition plate 4,
That is, it is necessary to make a large opening substantially over the semicircle of the header pipe material 1. Therefore, in the brazing process performed after the partition plate 4 is inserted, a brazing failure is likely to occur in the insertion hole 5, causing a leakage of the heat medium. Further, when such a large opening is provided in the side wall of the header pipe material 1, the strength of the header pipe material 1 is significantly reduced. Therefore, when the insertion hole 5 is formed or the connection hole 3 is formed. In this case, there is a problem that the header pipe material 1 is deformed.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to temporarily fix a partition plate to an arbitrary position without providing a large insertion hole for inserting a partition plate, and to prevent heat medium leakage or header pipe material during a manufacturing process. It is an object of the present invention to provide a method for manufacturing a header pipe for a heat exchanger, which is not deformed.

(Means for Solving the Problems) According to the invention of claim (1), in order to solve the above-mentioned problems, a flat and rectangular header pipe material is bent into a cylindrical shape, and a heat medium guide for the heat medium is introduced into the header pipe material. In a method of manufacturing a header pipe for a heat exchanger in which a partition plate is inserted and the partition plate is brazed to the header pipe material,
A pressure bulging step of forming a plurality of fitting grooves for partition plates extending in the width direction of the rectangular header pipe material and bulging outward in the longitudinal direction of the header pipe material; A first bending step of bending the header pipe material into a U-shaped cross section, and an insertion step of inserting the partition plate into the fitting groove through an opening of the header pipe material after the first bending step; And a second bending step in which the opening side of the header pipe material is bent inward after the insertion step, and the opening end is brought into contact with the bent side.

According to the invention of claim (2), a flat and rectangular header pipe material is bent into a tubular shape, and a partition plate for guiding a heat medium is inserted into the header pipe material, and the partition plate is attached to the header pipe material. In a method of manufacturing a header pipe for a heat exchanger to be brazed, a first bending step of bending a rectangular header pipe material into a U-shaped cross section, and a width direction of the U-shaped header pipe material after the first bending step A pressure swelling step of forming a plurality of fitting grooves for a partition plate extending in the outside and swelling outward in the longitudinal direction of the header pipe material; and And a second bending step of bending the opening side of the header pipe material inward and abutting the opening end after the insertion step. Feature

(Operation) According to the invention of claim (1), a plurality of fitting grooves for partition plates are formed in the header pipe material in the pressure swelling step,
In the subsequent first bending step, a header pipe material having a U-shaped cross section is formed. Thereafter, a partition plate is inserted from the opening side of the header pipe material, and the partition plate is fitted into an arbitrary fitting groove. Next, the opening side of the header pipe material is bent inward. As a result, the entire periphery of the partition plate is fitted into the fitting groove, and is temporarily fixed securely in the header pipe material.

According to the invention of claim (2), the cross section U is used in the first bending step.
A letter-shaped header pipe material is formed. In the subsequent pressure swelling step, fitting grooves for a plurality of partition plates are formed in the header pipe having a U-shaped cross section. Thereafter, a partition plate is inserted from the opening side of the header pipe material, and the partition plate is fitted into an arbitrary fitting groove. Next, the opening side of the header pipe material is bent inward. As a result, the entire periphery of the partition plate is fitted into the fitting groove, and is temporarily fixed securely in the header pipe material.

(Embodiment) FIGS. 1, 3 to 12 show one embodiment of the present invention, and FIG. 1 is a perspective view of a heat exchanger having a header pipe as a component.

In the figure, reference numeral 10 denotes a heat exchanger used as a radiator or the like for a vehicle, and reference numeral 11 denotes a pair of cylindrical header pipes extending vertically and facing each other. Heat exchange tubes 12 are connected to each header pipe 11 in a plurality of stages, and heat transfer fins 13 are interposed between the heat exchange tubes 12. A disk-shaped partition plate 14 is mounted in the header pipe 11.
Each partition plate 14 allows the heat medium to flow in a meandering manner from the upper heat medium inflow pipe 15 to the lower heat medium outflow pipe 16 via the heat exchange tube 12.

FIG. 3 shows how the header pipe 11, the heat exchange tube 12, and the partition plate 14 are mounted. A plurality of connection holes 17 are provided vertically on the facing surface of each header pipe 11. The end of the heat exchange tube 12 is inserted into the connection hole 17 and brazed. Further, a fitting groove 18 for a partition plate bulging outward is formed between the heat exchange tubes 12 on the peripheral side wall of the header pipe 11, and a peripheral edge of the partition plate 14 is fitted into each fitting groove 18. Be brazed.

FIGS. 4 (a), (b) to 12 show a method of manufacturing the header pipe 11 described above. Here, FIG. 4 (a)
(B) shows a hole making step of the manufacturing method. That is, a header pipe material 19 in which a brazing material is clad with a flat plate having the vertical dimension of the header pipe 11 and the peripheral dimension of the peripheral side wall is prepared. This header pipe material 19 is placed on a die 21 of a press machine 20 as shown in FIG.
It is held by 22. A punch 24 for punching is fixed to the punch holder 23. This punch for punching
The lower end of 24 has a cutting portion 25 for cutting in the width direction of the header pipe material 19. On the other hand, the die 21 is provided with a groove 26 for inserting a punch, and the groove 26 has a substantially similar shape to the cutting portion 25 with the header pipe material 19 interposed therebetween.

Here, as shown in FIG. 4 (b), the upper die set
To move the hole 27 downward, the punch 24 for punching moves down along the punch guide 22, and the cutting section of the punch 24 for punching
25 is inserted into groove 26 of die 21. At this time, this cutting part
A connection hole 17 is provided by 25. Therefore, as shown in FIG. 5, a flat header pipe material having a connection hole 17 is provided.
19 are manufactured.

When the hole making step is completed, FIG.
The process proceeds to the pressure swelling step shown in FIG. In this pressure swelling step, a punch for press 29 having a bent portion 28 having a semicircular cross section at the lower end is attached to the punch holder 23 instead of the punch for punch 24. Then, as shown in FIG.
The pressing punch 29 is positioned between the connection holes 17, and the pressing punch 29 is lowered as shown in FIG. 6 (b). Thereby, as shown in FIG. 7, the fitting groove 18 for the partition plate is formed in the header pipe material 19 having the connection hole 17 by bulging outward.

When such a pressure swelling process is completed, the process proceeds to a first bending process shown in FIGS. 8 (a) and 8 (b). That is, as shown in FIG. 8 (a), the header pipe material 19 is placed on a die 32 of a press machine 31 having a semicircular groove 30, and the lower end thereof is formed by a bending punch 33 having a semicircular lower end. Fig. 8 (b)
Press as shown. As a result, a header pipe material 19 having a U-shaped cross section having a curved surface portion 34 as shown in FIG.
Is formed.

When the first bending step is completed, the process proceeds to the step of inserting the partition plate 14 shown in FIG. That is, the partition plate 14 is inserted into the fitting groove 18 of the header pipe material 19 from the opening 35 side of the header pipe material 19. The diameter of the partition plate 14 is such that the peripheral edge thereof can be pressed against the inner surface of the fitting groove 18. As a result, the partition plate 14 is temporarily fixed in the fitting groove 18 of the header pipe material 19.

When this insertion step is completed, FIGS. 11 (a) and 11 (b)
The process proceeds to the second bending step shown in FIG. In the second bending step, a press 36 shown in FIGS. 11A and 11B is used. That is, a groove 38 corresponding to the outer surface of the header pipe 11 is formed at the center of the lower surface of the upper die 37, and an inclined portion 39 that extends obliquely downward is formed at both peripheral edges of the lower surface. On the other hand, this upper model
The movable die 40 has a pair of movable dies 40 facing each other, and the upper surface on the opposite side of each movable die 40 has a notch 41 corresponding to the outer surface of the header pipe 11, and the outer peripheral edge of the upper surface has Upper die 37
And a guide portion 42 that is inclined corresponding to the inclined portion 39.

When performing bending by this press machine 36, first,
The curved surface portion 34 of the header pipe material 19 after the insertion process is placed on the notch 41 of each die 40 as shown in FIG. 11 (a), and the opening 35 of the header pipe material 19 is turned upward. . Thereafter, the upper die 37 is lowered by the upper die set 43.

During the lowering of the upper die 37 (solid white arrow), as shown in FIG.
, And presses the guide portion 42. Due to this pressing force, a moving force is generated in the movable die 40 in the lateral direction, and each movable die 40 moves to the side facing each other (an outline arrow indicated by a chain line), and holds the curved surface portion 34 of the header pipe material 19. On the other hand, as shown in FIG. 11 (b), the upper die 37 bends the opening 35 side of the header pipe material 19 into a semicircular shape by the groove 38, and presses this opening 35 side to the peripheral edge of the partition plate 14. At the same time, the opening end 44 is brought into contact. As a result, as shown in FIG. 12, a cylindrical header pipe material 19 having connection holes 17 and temporarily fixing the partition plate 14 in the header pipe material 19 is formed.

When this second bending step is completed, the lids 45 are attached to the upper and lower portions of the header pipe material 19, and the respective pipes 15, 16 are connected and brazed all together, whereby the header pipe 11 is manufactured. In addition, this batch brazing
Each heat exchange tube 12 is connected to each connection hole 17 of each header pipe 11.
And then connect the heat transfer fins 13 to each heat exchange tube 12
It may be performed after intervening.

As described above, in the method for manufacturing the header pipe 11 according to the present embodiment, the pressure pipe swelling step of the header pipe material 19, the first bending step, the inserting step of the partition plate 14, and the second bending step of the header pipe material 19 are performed. The partition plate 14
Pressed into 18 and temporarily fixed.

Further, since each of the fitting grooves 18 is provided between all the heat exchange tubes 12, the insertion position of the partition plate 14 can be arbitrarily selected, and a desired flow of the heat medium can be formed. it can.

Further, since each of the fitting grooves 18 bulges outward, the strength of the header pipe 11 is improved, and the thickness of the header pipe 11 itself can be reduced.

Furthermore, this second bending step is performed using a header pipe material 10
By simply bending the opening 35 side of the
Since the side is not bent, the connection hole 17 is not distorted.

FIGS. 13 (a) (b) to 17 (a) (b) show another embodiment of the present invention. That is, in the above embodiment, the connection hole 17 and the fitting groove 18 are formed in the flat header pipe material 19.
After the hole forming step and the pressure swelling step for forming a hole, the process is shifted to the first bending step. In this embodiment, an example in which the first bending step precedes the hole forming step and the pressure swelling step is shown. ing.

13 (a) and 13 (b) show the first bending step. As shown in FIG. 13 (a), the header pipe blank 19 is cut into a die 31 of a press 31 having a semicircular groove 30. 32, and the lower end is bent to the thirteenth position by a bending punch 33 having a semicircular lower end.
Press as shown in FIG. As a result, a header pipe material 19 having a U-shaped cross section having a curved surface portion 34 as shown in FIG. 14 is formed.

When the first bending process of the header pipe material 19 is completed, the process proceeds to a hole forming process shown in FIGS. 15 (a) and 15 (b). That is, as shown in FIG. 15 (a), the U-shaped header pipe material 19 is placed on a die 47 of a press machine 46 formed to correspond to the inner surface of the header pipe material 19, and Punch guide 48 on the outer surface of material 19
Hold by. A punch 50 for punching is fixed to the punch holder 49. At the lower end of the punch 50 for punching, a cutting portion 51 for cutting in the width direction of the curved surface portion 34 of the header pipe material 19 is provided. On the other hand, a die 47 is provided with a groove 52 for inserting a punch.
It has a substantially similar shape to the cutting portion 51 with the curved surface portion 34 therebetween.

Here, as shown in FIG. 15 (b), the upper die set
When the 52 is moved downward, the cutting portion 51 of the punch 50 is inserted into the groove 52 of the die 47. At this time, the connection hole 17 is provided by the cutting portion 51. Therefore, as shown in FIG. 16, a header pipe material 19 having a U-shaped cross section having the connection hole 17 in the curved surface portion 34 is manufactured.

When the hole making step is completed, FIG. 17 (a)
The process proceeds to the pressure swelling step shown in FIG. In this pressure swelling step, a punch for punch 54 having a bent portion 53 having a semicircular cross section extending vertically along the periphery is attached to the punch holder 49 instead of the punch for punch 50. Then, as shown in FIG. 17 (a), the pressing punch 54 is positioned between the connection holes 17, and as shown in FIG. 17 (b), the pressing punch 54
Is lowered. As a result, as shown in FIG. 9 of the embodiment, the fitting groove 18 for the partition plate is formed in the header pipe material 19 having the connection hole 17 and having a U-shaped cross section so as to bulge outward.

When the perforating step is completed, the inserting step of the partition plate 14 and the second
What is necessary is just to perform a bending process sequentially.

According to the manufacturing method according to this embodiment, the curved surface portion 34 is formed by the first bending step, and the connection hole 17 is formed in the curved surface portion 34 by the subsequent boring process. The connection hole 17 is formed directly in the hole 34. Therefore, the shape and size of the cutting portion 51 of the punch 50 may be set in accordance with the connection end of the heat exchange tube 3, and the dimensions can be easily obtained.

In the two embodiments described above, the pressure swelling step is performed after the hole piercing step. Conversely, the hole swelling step may be performed after the pressure swelling step.

(Effects of the Invention) As described above, according to the invention of claims (1) and (2), a header pipe material having a U-shaped cross section having a fitting groove by the pressure swelling step and the first bending step is provided. The partition plate is inserted into this fitting groove, and the opening side of this header pipe material is bent inward, so that the partition plate is temporarily fixed in the header pipe material. It is not necessary to provide a large insertion hole. Therefore, there is an advantage that the deformation of the header pipe material accompanying the drilling of the insertion hole having a large opening area, and furthermore, the poor brazing can be prevented.

The partition plate can be temporarily and securely fixed by the fitting groove, and the fitting groove for the partition plate can be selected to partition the header pipe at an arbitrary position. Further, since the fitting groove bulges outward, the strength of the header pipe itself can be improved.

[Brief description of the drawings]

1 and 3 to 12 show one embodiment of the present invention. FIG. 1 is an overall perspective view of a heat exchanger, and FIG. 2 is a perspective view showing a conventional method for manufacturing a header pipe. FIG. 3 is a cross-sectional view showing a mounting state of a header pipe, a heat exchange tube and a partition plate, FIGS. 4 (a) and (b) are cross-sectional views showing a punching step, and FIG. FIGS. 6 (a) and 6 (b) are cross-sectional views showing a pressure swelling step, FIG. 7 is a perspective view showing the header pipe material after the pressure swelling step, FIG. (A) and (b) are front views showing a first bending step, FIG. 9 is a perspective view showing a header pipe material after the first bending step, FIG. 10 is a perspective view showing a partition plate inserting step, and FIG. (A) and (b) are front views showing a second bending step, FIG. 11 (c) is an explanatory view showing a moving state of the upper die and the movable die, and FIG. 12 is a second bending step. 13 (a), (b) to 17 (a) are perspective views showing the header pipe material after the process.
13B shows another embodiment of the present invention. FIGS. 13A and 13B are front views showing a first bending step, and FIG. 14 shows a header pipe material after the first bending step. Perspective view, 15th
(A) and (b) are cross-sectional views showing a hole making step, FIG. 16 is a perspective view showing a header pipe material after the hole making step, and FIGS. 17 (a) and (b) show a pressure swelling step. It is sectional drawing. In the figure, 10 ... heat exchanger, 11 ... header pipe, 14 ...
Partition plate, 18 ... fitting groove, 19 ... header pipe material,
35 ... opening, 44 ... opening end.

Claims (2)

(57) [Claims] 1. A heat pipe for bending a flat and rectangular header pipe material into a tubular shape, inserting a partition plate for guiding a heat medium into the header pipe material, and brazing the partition plate to the header pipe material. In a method for manufacturing a header pipe for an exchanger, a press-expanding step of forming a plurality of fitting grooves for partition plates extending in the width direction of the rectangular header pipe material and bulging outward in the longitudinal direction of the header pipe material. A first bending step of bending the header pipe material into a U-shaped cross section after the pressure swelling step; and, after the first bending step, fitting the partition plate through an opening of the header pipe material. A heat exchanger header, comprising: an insertion step of inserting into the mating groove; and a second bending step of bending the opening side of the header pipe material inward and abutting the opening end after the insertion step. Method of manufacturing a pipe. 2. A heat pipe for bending a flat, rectangular header pipe material into a tubular shape, inserting a heat medium guiding partition plate into the header pipe material, and brazing the partition plate to the header pipe material. A method for manufacturing a header pipe for an exchanger, comprising: a first bending step of bending a rectangular header pipe material into a U-shaped cross section; and extending in a width direction of the U-shaped header pipe material after the first bending step, and A pressure swelling step of forming a plurality of fitting grooves for a partition plate swelling in the longitudinal direction of the header pipe material; and, after the pressure swelling step, opening the opening of the header pipe material with the partition plate. And a second bending step of bending the opening side of the header pipe material inward and abutting the opening end after the insertion step. Exchanger Method for manufacturing a header pipe.