JPH0825010B2 - Manufacturing method of brazing metal pipe having guide piece in tube insertion hole - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brazing metal pipe made of aluminum (including its alloy) or the like, and in particular heat exchange for a car air conditioner condenser, radiator, evaporator, etc. manufactured by brazing specifications. The present invention relates to a method for manufacturing a brazing metal pipe having a guide piece in a tube insertion hole, which is preferably used as a header pipe of a container.

[0002]

2. Description of the Related Art For example, as a heat exchanger as described above,
As shown in FIG. 2, a plurality of flat tubes (1) having an oval cross section are arranged in parallel to a pair of hollow header pipes (3) and (4) arranged in parallel to form a header pipe. There is a so-called parallel flow type heat exchanger in which the fins (2) are connected to each other and are connected between the adjacent tubes (1) and (1).

As the above header pipes (3) and (4) of such a heat exchanger, generally, a brazing sheet in which a brazing material layer is clad on one or both sides of a core material is formed into a pipe shape, and the length direction of the pipe is measured. In addition, a plurality of oval tube insertion holes that match the cross-sectional shape of the tube are arranged in a row. Then, the tube (1) is inserted into the tube insertion holes of the header pipes (3) and (4) and brazed to join the header pipes (3) and (4) to the tube (1). Has been made.

Conventionally, the header pipe as described above is manufactured by punching an electric resistance welded pipe made of a brazing sheet to form a tube insertion hole. Therefore, the pipe is likely to be crushed or deformed.

Therefore, in order to solve the above-mentioned drawbacks, the present applicant bends and forms a part in the width direction or the length direction of a strip-shaped forming blank made of a brazing sheet into an arc-shaped cross section, and then forms the arc-shaped portion into the arc-shaped portion. A method for manufacturing a brazing pipe is proposed in which a tube insertion hole is formed by performing a hole forming process, and then both side edges of a molding piece are made into a shape of abutting to form a pipe for brazing (Japanese Examined Patent Publication No. 3-18982). ).

[0006] According to this method, it is possible to carry out the drilling from the one side of the arc portion with the pad die having a shape matching the arc portion applied, and it is possible to eliminate crushing and deformation of the pipe wall and to achieve high dimensional accuracy. It had the expected excellent effect of being a pipe.

However, in the above-described method for manufacturing a brazing metal pipe, when the tube insertion hole has a simple shape such as an ellipse, the advantages thereof can be maximized. As described above, there are cases where it is necessary to drill holes having a non-simple shape, and in this case, the following new problems were created.

[0008]

That is, in recent years, it has been attempted to facilitate and smooth the insertion of a tube into a tube insertion hole provided in a header pipe, to eliminate wobbling after insertion, and For the purpose of increasing the joint area and the like, as shown in FIG. 1, at least one side edge of the oval tube insertion hole (5) in the minor axis direction projects in parallel with the insertion tube (1). Providing guide pieces (7) has become commonplace.

Thus, in order to form such a guide piece (7), conventionally, a guide piece is formed at a prepared hole having a shape as shown in FIG. 31, that is, an elliptical side edge in the minor axis direction. After first forming a pilot hole (101) in which the forming protrusions (102) (102) are formed, burring is applied to the pilot hole (101) to project the protrusion in the thickness direction. It was done with the guide piece.

However, in order to form the pilot hole (101) by bending and forming a part of the strip-shaped forming plate into an arcuate section,
It is necessary to use a three-dimensional hole type that has a blade part that matches the prepared hole shape in bottom view and an arc surface in side view, which complicates the manufacturing process of the hole type and increases the cost. It was a new problem that was prone to damage and wear of the blade.

The present invention has been made in view of the above technical background, and has an oval tube insertion hole,
In addition, a brazing metal pipe having a guide piece protruding in parallel with the insertion tube is provided on at least one side edge of the tube insertion hole in the minor axis direction, and a piercing die having a complicated shape is unnecessary, and the pipe wall is crushed. The present invention aims to enable production without causing deformation or deformation, and provides a production method therefor.

[0012]

In order to achieve the above object, the present invention is basically the same as the above-mentioned proposal, in which a part of a band-shaped forming blank is bent and formed into an arc-shaped cross section. While adopting a sequential process of forming a hole in the arc part and forming the pipe by making both side edges of the forming plate into abutting shape, it is not necessary to form a pilot hole with a complicated shape. This is a new device for

That is, the first aspect of the present invention has an oval tube insertion hole (5) and a minor diameter of the tube insertion hole (5), as shown with reference to the drawings. A method for manufacturing a brazing metal pipe having a guide piece (7) projecting parallel to the insertion tube (1) on at least one side edge of the brazing material, the brazing material being provided on at least one surface of the core material (30a). A step of forming a circular arc portion (39) by bending a part of the band-shaped forming blank (30) made of a brazing sheet to which the layer (30b) is adhered in a width direction or a length direction so as to have an arc cross section; A step of swelling a portion of the arc portion (39) in which the tube insertion hole is to be formed into a bulging shape in a thickness direction; and a bulging portion (42) formed by the squeezing processing, in a minor axis direction of the bulging portion. Punching is performed with at least one side of the Of forming the groove insertion hole (5) and the arcuate part (39) in the strip-shaped blank (30)
Of the metal pipe for brazing having a guide piece in the tube insertion hole, including a step of bending the non-circular arc portions (40) (40) except for forming into a pipe having both sides abutting against each other. The main point is the manufacturing method.

The second aspect of the present invention has an oval tube insertion hole (5), and the insertion tube is provided at at least one side edge of the tube insertion hole (5) in the minor axis direction. A method for manufacturing a brazing metal pipe having a guide piece (7) projecting parallel to (1), comprising a core material (30a)
The band-shaped forming blank (30) consisting of a brazing sheet with a brazing material layer (30b) adhered to at least one surface of A step of forming at least one pair of thin push-in portions (31) and a part of the band-shaped forming blank (30) in the width direction or the length direction in a mode in which the push portions (31) are located on the arc surface. And a step of forming the circular arc portion (39) by bending and forming the circular arc section, and a portion of the circular arc portion (39) between the pair of pushing portions (31) and (31) bulging in the thickness direction. Drawing process and the pressing part (31) (31)
And, the bulging portion (42) formed by drawing is perforated so that at least one side portion of the bulging portion in the minor axis direction remains to form an oval tube insertion hole (5). The step of drilling and the arc portion (3
Brazed metal having a guide piece in the tube insertion hole, including a step of bending the non-circular arc parts (40) (40) except for 9) to form a pipe with both side edge butting shape. The gist of the method is a pipe manufacturing method.

Further, it is desirable that the above-mentioned manufacturing process, including the process of forming the strip-shaped blank, is continuously carried out while intermittently transferring one long brazing sheet in the length direction. . That is, the third aspect of the present invention has an oval tube insertion hole (5), and is parallel to the insertion tube (1) at least at one side edge in the minor axis direction of the tube insertion hole. A method for manufacturing a brazing metal pipe having a guide piece (7) projecting in a circular shape, comprising:
By partially removing the brazing sheet (50) in which the brazing material layer (30b) is applied to at least one surface of a), both ends in the lengthwise direction or the widthwise direction are connected to the outside through the connecting strip (51). A step of forming the strip-shaped blank (30) connected to the surplus support piece (52), and bending and shaping a part of the strip-shaped blank (30) in the width direction or the length direction into an arc shape in cross section. A step of forming the arc portion (39), a step of drawing a portion of the arc portion (39) where the tube insertion hole is to be formed into a bulging shape in the thickness direction, and a bulging portion (42 formed by the drawing processing. ), A step of forming a tube insertion hole (5) by performing a perforating process in a state where at least one side portion of the bulging portion in the minor axis direction remains, and in the band-shaped forming blank (30) The non-circular arc portion (40) (40) excluding the circular arc portion (39) is bent and formed into a bilateral edge-butting shape. The step of forming a pipe connected to the surplus support piece (52) through the connecting strip (51) and the step of separating the pipe from the surplus support piece (52). While carrying out each step from the forming step of 30) to the pipe separating step, one long brazing sheet (50) is intermittently transferred in the length direction,
The gist is a method for manufacturing a brazing metal pipe having a guide piece in a tube insertion hole, which is characterized in that the brazing metal pipe is continuously performed.

Further, a fourth aspect of the present invention has an oval tube insertion hole (5), and the insertion tube (1) is provided on at least one side edge of the tube insertion hole in the minor axis direction. A method for manufacturing a brazing metal pipe having a guide piece (7) projecting parallel to the brazing sheet (50), wherein a brazing material layer (30b) is attached to at least one surface of a core material (30a). To partially form the strip-shaped forming plate (30) whose both ends in the length direction or the width direction are connected to the extra support piece (52) on the outer side through the connecting strip (51). A step of forming at least one pair of thin press-in portions (31) by pressurizing the brazing sheet (50) or the band-shaped forming blank plate (30) at the planned end portions of the tube insertion hole; The part (31) is located in a circular arc surface A step of forming a circular arc portion (39) by bending a part of the forming blank (30) in the width direction or the length direction into an arc shape in cross section, and the pair of pushing portions in the arc portion (39) ( 31) A step of drawing a portion between the (31) in a thickness direction in a bulging shape, and a pressing portion (31) (31)
And the tube insertion hole (5) is formed in the bulging part (42) formed by the drawing process by performing the piercing process in a state where at least one side part of the bulging part in the minor axis direction remains. The connecting strip (51) is formed by bending and forming the non-circular arc portions (40) (40) except the circular arc portion (39) in the band-shaped forming blank (30) into a bilateral edge-butting shape. Including a step of forming a pipe connected to the surplus support piece (52) through the pipe and a step of separating the pipe from the surplus support piece (52), from the step of forming the strip-shaped forming blank (30) to the pipe separation step. The brazing metal having a guide piece in the tube insertion hole, characterized in that the steps up to are continuously carried out while intermittently transferring one long brazing sheet (50) in the length direction. The gist of the method is a pipe manufacturing method.

Preferably, a meat escape hole (32) is provided in advance at a site where the pushing portion (31) is to be formed in the strip-shaped blank (30), and then the peripheral portion including the meat escape hole is pressurized. It is preferable to form the pushing part (31).

[0018]

[Operation] A part of the strip-shaped forming plate (30) in the width direction or the length direction is bent and formed in an arc cross section, and then a portion of the arc portion (39) where the tube insertion hole is to be formed is bulged in the thickness direction. Since the tube insertion hole (5) is formed by carrying out the boring process in a state in which at least one side portion of the bulging part (42) in the minor axis direction remains, the tube insertion hole (5) having an elliptical shape in the boring process ( When 5) is directly opened, the remaining portion of the bulging portion (42) appears as the guide piece (7) as it is. For this reason, it is not necessary to form a pilot hole in which the guide piece forming convex portion is left on the side edge in the minor axis direction. Of course, since the drilling is not performed on the tubular pipe but on the circular arc portion (39), a pad mold having a shape matching the circular arc portion (39) was applied from one surface side of the circular arc portion (39). You can perform drilling in the state,
There is no risk of collapse or deformation of the tube wall.

Further, at least one pair of thin push-in portions (31) are formed in the strip-shaped blank (30) by pressurizing the strip-shaped blank (30) at predetermined portions of both ends of the tube insertion hole. In this case, in the step of piercing the tube insertion hole, the pressing portion is smoothly sheared, and the risk of causing burrs on both end edges of the tube insertion hole and obstructing tube insertion is reduced.

Further, each step from the step of forming the band-shaped forming blank (30) to the step of separating the pipe is continuously performed while intermittently transferring one long brazing sheet (20) in the length direction. Thus, the brazing metal pipe with the guide piece can be continuously and efficiently produced.

Further, by providing the meat escape hole (32) in advance in the portion where the pushing portion (31) is to be formed, the meat that is to be deformed to the surroundings due to the pressing force at the time of forming the pushing portion is provided in the escape hole (32). ), And bulging due to meat escaping around the indented part is prevented.

[0022]

Embodiments of the present invention will be described below. This example shows a method for manufacturing a header pipe used in a heat exchanger made of aluminum (including its alloy) as a car cooler capacitor shown in FIGS. 1 to 5.

1 to 5, (1) is a plurality of tubes vertically arranged in a horizontal state, (2) is a corrugated fin interposed between adjacent tubes (1) and (1), 3) and 4) are left and right aluminum header pipes having a circular cross section, and the brazing pipes manufactured by the present invention are used as these header pipes.

The header pipes (3) and (4) are manufactured as follows.

That is, first, as shown in FIGS. 10 and 11, a band-shaped forming blank plate (30) having a brazing material layer (30b) formed on both surfaces of a core material (30a) made of aluminum is prepared. As the brazing material layer (30b), an Al-Si alloy having a Si content of about 6 to 13 wt% is generally used.

Next, as shown in FIGS. 13 and 14, it is desirable to press a predetermined portion of both ends of the tube insertion hole in the forming blank (30) by embossing to press a pair of thin D-shaped pushing portions ( 31) is formed. This pushing part (3
1) plays a role of preventing burrs from being generated at both end edges of the insertion hole when the tube insertion hole (5) is formed, as will be described later. In this embodiment, the tube insertion hole (5)
Are arranged at equal intervals in the lengthwise direction with their major axis directions aligned with the widthwise direction of the strip-shaped forming plate (30), so that the pair of pressing portions (31) (31) also form the forming plate (30). 30) are formed at symmetrical positions with respect to the center line in the length direction of the molded plate (30), and a plurality of pairs are arranged in a row in the length direction of the forming blank (30).

The formation of the above-mentioned push-in portion is not essential.

When forming the above-mentioned push-in portion (31), the meat of the raw plate (30), which tends to be deformed to the surroundings under the applied pressure, escapes to the periphery of the push-in portion and bulges the outer periphery of the push-in portion, so that the tube insertion hole is formed. There is a risk that the edge shape of (5) may change or burr may occur. Therefore, the pushing part (31)
In order to absorb the escape of meat, preferably, as shown in FIG. 12, a small hole (32) for meat escape is pre-drilled at a predetermined portion of the indentation portion before the formation of the indentation portion. Hole (3
By pressing the peripheral part including 2), the pressing part (31)
Is recommended to be formed.

By the way, the outer edge (31a) (see FIG. 14) of the pressing portion (31) formed as described above is formed as a vertical surface parallel to the thickness direction or a slightly outwardly inclined surface. Is good. This is after molding into a pipe,
As shown in FIG. 7 and FIG. 8, the end edge (31a) is inclined toward the insertion direction of the tube (1) so as to open outward to a midpoint of the wall thickness so that it serves as a guide surface (34) when inserting the tube. This is to contribute to smooth and easy insertion.

Next, as shown in FIG.
0) A recess (37) for connecting the refrigerant inlet / outlet pipe is cut out at the same position on both side edges in the width direction, and then a plurality of recesses (37) are formed at the same position on both side edges of the forming blank (30). Make a notch (38). These notches (38) correspond to each other after the two side edges are butted,
The partition plate insertion hole (11) for installing the partition plate (6) for the meandering circulation of the refrigerant in the heat exchanger shown in FIG. 5 is formed.

Next, both side edges in the width direction of the band-shaped forming blank (30) are pressed by a press or the like in the thickness direction to be faced. This pressurization is performed on the lower surface for one side edge portion and on the upper surface for the other side edge portion, so that FIG.
As shown in Figure 1, one side edge is faced with an inclined surface (35a) that gradually becomes thinner from the bottom edge to the top edge, and the other side edge is faced from the top edge to the bottom edge. The sloped surface (35b) is gradually thinned. Moreover, the brazing material layer (30b) is present on each of the inclined surfaces (35a) (35b). By arranging both side edges in the width direction of the band-shaped forming blank (30) in this way, as shown in FIG. 7, when the both side edges are made into an abutting shape, the abutting portion (36) is formed. A brazing material layer can be interposed on the contact surface in conformity with the overlapping shape, and sufficient brazing of the abutting portion (36) can be ensured by subsequent brazing. Note that this imposition step is performed by the above-mentioned recess (37) for connecting the refrigerant inlet / outlet pipe
It may be performed prior to the formation of 8).

Next, as shown in FIG. 17, the widthwise intermediate portion of the forming blank (30) including the pushing portions (31) (31) is arcuate in cross section along the lengthwise direction by pressing or the like. A circular arc portion (39) is formed by bending into a cross section, and the whole has a hat-shaped cross section. The bending of the arc portion (39) is performed with the pushing portion (31) positioned outside.

Next, as shown in FIGS. 18 to 20, the portion of the arc portion (39) between each pair of the pushing portions (31) (31) is subjected to beading as a drawing work to form the arc portion (39). )
Inflate inward. The bulging is performed so that the length of the generated bulging portion (42) in the minor axis direction is slightly larger than the length of the tube insertion hole (5) in the minor axis direction.

Next, as shown in FIGS. 21 to 23, the bulging portion (42) and the pushing portion (31) are perforated to form an oval tube insertion hole (5). Bulging part (42)
Since its length in the minor axis direction is set to be slightly larger than the length in the minor axis direction of the tube insertion hole (5), both sides of the bulging portion (42) in the minor axis direction are formed by the above-mentioned perforating process. The remaining portion serves as the guide piece (7) for the tube insertion hole as it is. When the pushing portion (31) is provided, since the pushing portion (31) is thin, the pushing portion (31) is smoothly sheared by the punching process, and the pushing portion (31) is
Does not cause burrs on the edges.

Next, the horizontal non-circular arc portions (40) (40) on both sides of the circular arc portion (39) are pressed in the closing direction to bend and form the whole into a substantially inverted V shape (FIG. 24). Non-circular part (4
(0) (40) is further pressed in the approaching direction to bend and form the whole into a substantially inverted U-shape (Fig. 25), and then the non-circular arc portion (40) is bent into a circular cross section continuous with the circular arc portion (39). Then, it is formed into a header pipe having both sides butted against each other (FIG. 26).

After that, preferably, the pipe cross-sectional shape including the protruding shape of the guide piece (7) is modified to obtain the header pipes (3) and (4) having desired dimensions.

By the way, in the manufacture of the header pipe as described above, it goes without saying that a plurality of strip-shaped blanks (30) are first manufactured and the above-mentioned steps are carried out for each strip-shaped blank (30). Good, but production efficiency is to continuously carry out all the processes including the manufacturing process of the strip-shaped blank (30) while intermittently transferring one long brazing sheet (50) in the length direction. From the point of, it is particularly preferable.

That is, as shown in FIG. 27, after the meat escape hole (32) is formed at a predetermined position of the tip portion of the long brazing sheet (50) in the lengthwise direction, the brazing sheet (50) is kept in a predetermined amount. Transfer in the forward direction and stop.

Next, as shown in FIG. 28, unnecessary portions of the brazing sheet are punched out around the meat escape hole forming portion to form a strip-shaped forming plate (30) long in the width direction of the brazing sheet (50). It is manufactured by connecting both ends in the length direction to the outer excess support piece (52) through the connecting strip (51). At the same time, the next new meat escape hole (32) is formed in the rear of the strip-shaped blank (30). The length and width of the strip-shaped blank may be appropriately set according to the dimensions of the header pipe or the like of the intended heat exchanger. Also,
Reference numeral (53) is a feed hole provided in the surplus support piece (52) at a lateral position of the connecting strip (51).

Next, the brazing sheet (50) is further transported and stopped, and as shown in FIG. 29, the pushing portion (31) is formed at the position of the meat clearance hole of the leading strip-shaped blank (30). At the same time, a new strip-shaped blank (30) with a meat relief hole is formed behind the front strip-shaped blank (30),
Further, a third new meat relief hole (32) is bored behind it. Thereafter, the brazing sheet (20) is intermittently transferred by the same procedure, and each step is performed on the forming blank (20) and a new forming blank (30) is continuously formed. The steps of forming the band-shaped forming blank (30) and punching the meat relief hole (32) may be performed in the reverse order. First, after forming the molding blank (30), the meat relief hole (32) is formed. ) May be provided. Alternatively, the meat escape hole (32) may be formed first, the push-in portion (31) may be formed, and then the forming blank plate may be formed.

In the continuous manufacturing method in which the brazing sheet (50) is transferred as described above, the strip-shaped blank (3
Since each step for 0) is performed while being connected to the surplus support piece (52) through the connecting strip (51), as shown in FIG. 30, when the step of forming the pipe is completed, as shown in FIG. A pipe molded body (41) that is still connected to the surplus support piece (52) is obtained.

Therefore, in the final step, the pipe molded body (41) is cut and separated from the connecting strip (51) to obtain a desired header pipe.

The header pipe thus manufactured is washed as needed and then sent to the product assembling process. Since this header pipe will be brazed after that,
The abutting portion is inevitably joined in the brazing process, and therefore the abutting portion (36) does not need to be closed by welding like an electric resistance welded pipe.

The heat exchanger is manufactured as follows. That is, both ends of the tube (1) are inserted into the tube insertion holes (5) of the header pipes (3) and (4). When inserting the tube (1), both ends in the width direction of the tube are guided by the guide surfaces (34) at both ends of the tube insertion hole (5) and smoothly inserted, and after insertion, the guide piece (7) of the insertion hole. Guided by the tube (1)
Is plugged straight in. Moreover, the tube (1) is firmly guided by the guide piece (7) even after it is inserted, and there is almost no wobbling in the height direction of the tube (1), and the header pipes (3) (4) and the tube (1) form a right-angled shape. Connected.

After the tubes are inserted, the corrugated fins (2) also made of a brazing sheet are arranged between the adjacent tubes (1) and (1) and outside the outermost tubes, and the partition plate insertion hole of the pipe is provided. After inserting the partition plate (6) into (11) and arranging the upper and lower side plates (12) and (12) outside the outermost corrugated fins and temporarily assembling, these components are brazed in the furnace. Brazing all at once. After brazing, as shown in FIG. 3, a sufficient fillet is formed at the connecting portion between the header pipe (3) (4) and the tube (1), and the header pipe and the tube are firmly joined together without a gap. Will be Further, the outwardly open guide surfaces (34) at both ends of the insertion hole serve as a wax reservoir, and the braze flows in, and the abutting portions of the guide piece (7) and the tube (1) are widely joined to each other for a stronger joint. Guarantee. In addition, fillets are also formed at the abutting portions (36) of the header pipes (3) and (4), and the abutting portions (36) are hermetically joined. In addition, since the header pipes (3) and (4) are deformed under pressure at both side edges of the forming blank plate (30) at the manufacturing stage to be crushed into a continuous thin state, the abutting portion ( Since 36) matches the overlapping state and the brazing material layer (30b) exists between the contact surfaces, the joining of the abutting portions (36) can be more reliably and sufficiently guaranteed. In addition,
(8) and (8) shown in FIG. 2 are header pipes (3).
(4) are upper and lower lid pieces, respectively, and these lid pieces are molded into a cap shape as shown in FIG. 5, and the end portions of the header pipes are formed after the header pipes (3) and (4) are formed and before brazing. When the brazing is applied to the header pipe, the pipe has a role of blocking the opening of the abutting portion of the header pipe due to thermal deformation when the brazing heat is applied.
Further, (9) shown in FIG. 2 is a refrigerant inlet pipe, (10) is the same outlet pipe, and these inlet and outlet pipes are brazed together like other parts.

In the above embodiment, the case where the header pipes (3) and (4) are manufactured such that the major axis direction of the tube insertion hole (5) matches the width direction of the strip-shaped blank (30) will be described. However, the insertion hole may be provided so that the major axis direction thereof coincides with the longitudinal direction of the forming blank (30).

[0047]

According to the first aspect of the present invention, after a part of the band-shaped forming blank in the width direction or the length direction is bent and formed into an arc shape in cross section, the site where the tube insertion hole is to be formed in the arc part is formed. The tube insertion hole is formed by bulging in the thickness direction and performing the piercing process in a state where at least one side part of the bulging portion in the minor axis direction remains, so that the elliptically-shaped oval shape is used in the piercing process. If the tube insertion hole is opened directly, the remaining portion of the bulge appears as it is as a guide piece. For this reason, it is not necessary to form a pilot hole in which a guide piece forming convex portion is left on the side edge in the minor axis direction, and a complicated drilling die matching the pilot hole shape in bottom view for forming the pilot hole is not necessary. Of course, it is possible to reduce the complexity of drilling-type machining and the risk of blade damage and wear.
Of course, since the drilling is not performed on the tubular pipe but on the arc portion, the punching is performed with the pad die having a shape matching the arc portion applied from one side of the arc portion. It is possible to reduce the risk of crushing or deforming the tube wall.

Further, according to the second aspect of the present invention, since the thin-walled pressing portions are formed in advance in the tube insertion hole end portions of the forming blank, the pressing portions are formed in the tube insertion hole punching step. Can be smoothly sheared, and the risk of causing burr on both edges of the tube insertion hole and obstructing tube insertion can be reduced.

According to the third and fourth aspects of the invention, each step from the step of forming the strip-shaped forming blank to the step of separating the pipe is intermittently performed in the lengthwise direction of one long brazing sheet. Since it is carried out continuously while being transferred, it is possible to continuously and efficiently produce the brazing metal pipe with a guide piece, and it is also possible to produce it by full automation.

According to the fifth aspect of the present invention, the meat relief hole is provided in advance at the planned push-in portion, so that the meat that is about to be deformed to the surroundings when the push-in portion is formed by pressurization is removed. Therefore, it is possible to prevent the bulge due to the meat escaping around the pressing portion, and more effectively prevent the defective wall thickness and the occurrence of burrs at the edge of the tube insertion hole.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat exchanger using a brazing pipe manufactured according to the present invention as a header pipe, showing the header pipe and a tube separately.

2 (a) is a front view of the heat exchanger shown in FIG. 1,
Similarly, (B) is a plan view.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a vertical cross-sectional view of a brazing pipe manufactured according to the present invention.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a front view of the brazing pipe.

FIG. 9 is a rear view of the same.

FIG. 10 is a perspective view of a band-shaped forming blank as a material of a brazing pipe.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a perspective view showing a state in which a meat clearance hole is formed in a band-shaped forming blank.

FIG. 13 is a perspective view showing a state where a pressing portion is formed on a strip-shaped forming blank.

14 is a sectional view taken along line XIV-XIV in FIG.

FIG. 15 is a plan view showing a state in which a notch for inserting a partition plate and a recess for connecting a refrigerant inlet / outlet pipe are provided in a forming blank plate.

FIG. 16 is a cross-sectional view showing a state where both side edges in the width direction of the forming blank are faced.

FIG. 17 is a perspective view after formation of an arc portion.

FIG. 18 is a perspective view after forming a bulging portion by drawing.

19 is a sectional view taken along line XIX-XIX in FIG.

20 is a sectional view taken along line XX-XX of FIG.

FIG. 21 is a perspective view after drilling a tube insertion hole.

22 is a sectional view taken along line XXII-XXII of FIG.

23 is a sectional view taken along line XXIII-XXIII of FIG.

FIG. 24 is a cross-sectional view after the reverse V-shape bending process.

FIG. 25 is a cross-sectional view after the reverse U-shaped bending process.

FIG. 26 is a cross-sectional view after molding into a pipe.

FIG. 27 is a perspective view showing a state in which a leading meat clearance hole is formed in one long brazing sheet.

FIG. 28 is a perspective view after the brazing sheet of FIG. 27 is transferred and the next step is performed.

FIG. 29 is a perspective view after the brazing sheet is further transferred and the next step is performed.

FIG. 30 is a perspective view before performing a pipe separating step.

FIG. 31 is a plan view showing a state in which a pilot hole is formed in the conventional brazing pipe manufacturing method.

[Explanation of symbols]

 1 ... Tube 3, 4 ... Header 5 ... Tube insertion hole 7 ... Guide piece 30 ... Strip-shaped blank 30a ... Core material 30b ... Brazing material 31 ... Push-in portion 32 ... Meat escape hole 39 ... Arc portion 40 ... Non-arc portion 42 … Bulging part 50… Blazing sheet 51… Connecting strip 52… Excessive support piece

Claims (5)

[Claims] 1. An oval tube insertion hole (5) is provided,
A method for manufacturing a brazing metal pipe having a guide piece (7) projecting parallel to the insertion tube (1) on at least one side edge of the tube insertion hole (5) in the minor axis direction, A band-shaped forming plate (3) made of a brazing sheet in which a brazing material layer (30b) is applied to at least one surface of a core material (30a).
0) is formed by bending a part of the width direction or the length direction in an arc shape in cross section to form an arc portion (39), and the tube insertion hole formation planned site in the arc portion (39) is formed in the thickness direction. The step of drawing into a bulging shape, and the bulging portion (42) formed by the drawing processing is perforated in a state in which at least one side portion of the bulging portion in the minor axis direction remains, A step of forming a circular tube insertion hole (5), and a non-circular arc portion (40) (40) excluding the circular arc portion (39) of the band-shaped forming blank (30) are bent and formed at both side edges. Forming a pipe-like pipe, a method for producing a brazing metal pipe having a guide piece in a tube insertion hole. 2. Having an oval tube insertion hole (5),
A method for manufacturing a brazing metal pipe having a guide piece (7) projecting parallel to the insertion tube (1) on at least one side edge of the tube insertion hole (5) in the minor axis direction, A band-shaped forming plate (3) made of a brazing sheet in which a brazing material layer (30b) is applied to at least one surface of a core material (30a).
0) is applied to both ends of the tube insertion hole at predetermined positions to form at least one pair of thin indented portions (31) in the band-shaped forming blank (30), and the indented portions (31) are A step of forming a circular arc portion (39) by bending a part of the band-shaped forming blank (30) in the width direction or the length direction in a circular arc cross-section in a manner of being positioned on the circular arc surface; ), The pair of pressing portions (31) (3)
1) a step of swelling the portion in the thickness direction into a bulging shape; and a short bulging portion of the swelling portion (42) formed by the pressing portion (31) (31) and the squeezing processing. A step of forming an oval tube insertion hole (5) by performing a boring process in a state in which at least one side portion in the radial direction remains, and an arc portion (39) in the band-shaped forming blank (30). Of the metal pipe for brazing having a guide piece in the tube insertion hole, including a step of bending the non-circular arc portions (40) (40) except for forming into a pipe having both sides abutting against each other. Production method. 3. A guide piece (1) having an oval tube insertion hole (5) and projecting parallel to the insertion tube (1) on at least one side edge of the tube insertion hole in the minor axis direction. A method for manufacturing a brazing metal pipe having 7), comprising partially removing a brazing sheet (50) having a brazing material layer (30b) adhered to at least one surface of a core material (30a), Forming a strip-shaped blank (30) having both ends in the length direction or the width direction connected to the extra support piece (52) on the outer side through a connecting strip (51), and the strip-shaped blank (30) Forming a circular arc portion (39) by bending a part of the width or length direction of the circular arc into a circular arc cross section, and bulging the portion of the circular arc portion (39) where the tube insertion hole is to be formed in the wall thickness direction. The step of drawing into a shape, and the bulging portion (42) formed by the drawing A step of forming a tube insertion hole (5) by performing a drilling process in a state where at least one side portion in the minor axis direction of the portion remains, and an arc portion (39) in the band-shaped forming blank (30). The non-circular arc portion (40) (40) to be removed is bent and formed into a shape in which both edges are abutted against each other, thereby forming a pipe connected to the surplus support piece (52) through the connecting strip (51). A step of separating the pipe from the surplus support piece (52), each step from the step of forming the band-shaped forming blank (30) to the step of separating the pipe into one long brazing sheet (50).
A method for manufacturing a brazing metal pipe having a guide piece in a tube insertion hole, which is carried out continuously while being intermittently transferred in the length direction. 4. A guide piece (1) having an oval tube insertion hole (5) and projecting parallel to the insertion tube (1) on at least one side edge of the tube insertion hole in the minor axis direction. A method for manufacturing a brazing metal pipe having 7), comprising partially removing a brazing sheet (50) having a brazing material layer (30b) adhered to at least one surface of a core material (30a), A step of forming a strip-shaped forming plate (30) having both ends in the length direction or the width direction connected to an extra support piece (52) on the outer side through a connecting strip (51), and the brazing sheet (50) or the strip shape Formed blank (3
0) by applying pressure to the predetermined portions of both ends of the tube insertion hole, so that at least one pair of thin push-in portions (3
1) forming step, and bending the part in the width direction or the length direction of the band-shaped forming blank (30) in an arc shape in a manner that the indented part (31) is located on the arc surface. Forming the part (39), and the pair of pushing parts (31) (3) in the arc part (39).
The process of drawing the part between 1) in the thickness direction into a bulging shape, and the pressing part (31) (31) and the bulging part (42) formed by the drawing process to the short part of the bulging part. A step of forming a tube insertion hole (5) by performing a boring process in a state where at least one side portion in the radial direction remains, and a non-circular arc except for the circular arc portion (39) in the band-shaped forming blank (30) A step of forming a pipe connected to the surplus support piece (52) through the connecting strip (51) by bending and forming the portions (40) (40) into a shape of abutting against each other at both sides, and the pipe. A long brazing sheet (50) including a step of separating the excess supporting piece (52) from the step of forming the band-shaped forming blank (30) to a step of separating the pipe.
A method for manufacturing a brazing metal pipe having a guide piece in a tube insertion hole, which is carried out continuously while being intermittently transferred in the length direction. 5. The push-in portion is formed by previously providing a meat escape hole (32) at a site where the push-in portion (31) is to be formed in the strip-shaped blank (30), and then pressurizing a peripheral portion including the meat escape hole. The method for producing a brazing metal pipe having a guide piece in the tube insertion hole according to claim 2 or 4, wherein the (31) is formed.