JP2002235889A - Header and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a header eliminating formation of a hollow part in a metallic portion of the header by preventing air bubbles from mixing into molten metal, and to provide a manufacturing method thereof. SOLUTION: This header manufacturing method is composed of a first to a fifth steps. In the first step, a molded element is obtained by molding molten metal into a specified shape by means of successive casting method so as to prevent air bubbles from mixing into the molten metal of metallic material. In the second step, a casting piece 26 is formed by cutting the molded element into a specified length. Then, the third to the fifth steps are made wherein the casting piece 26 is cut or anything to form a branch tubes 14 and a female thread portion, thereby manufacturing the header.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a header for branching and supplying water or hot water to a plurality of faucets such as a sink in a building and a vanity stand, and a method of manufacturing the header.

[0002]

2. Description of the Related Art Conventionally, a water supply or hot water supply pipe is connected to a header inside a wall of a building or the like, and the water or hot water is branched to each faucet device such as a sink or a vanity stand through the header. Supply. The header is mainly composed of a header body formed in a tubular shape from a metal material, and a plurality of tubular branch pipes protruding from the outer surface of the header body.

[0003] As a method of manufacturing the header, a sand casting method is generally employed. In the sand casting method, a molded product is formed using a mold formed of molding sand in which sand grains and clay are mixed. It is. That is, after a core is set in a cavity corresponding to the header recessed in the mold, a molten metal of a metal melted in a melting furnace is poured into the cavity. After cooling the mold, the header can be obtained by opening the mold and removing the core.

[0004]

However, in the above-mentioned conventional sand casting method, since air exists in the cavity of the mold, when the molten metal is injected into the cavity, air is mixed into the molten metal and bubbles are formed. Will be done. And
If the mold is cooled with air bubbles mixed in the molten metal, air bubbles remain in the metal part of the formed header, and the air bubbles form a cavity. As a result, when the header manufactured by the conventional method is used, water or hot water flowing in the header passes through the hollow portion and leaks to the outside of the header. There was a problem that the header might be damaged.

The present invention has been made by paying attention to such problems existing in the prior art. An object of the present invention is to provide a header capable of preventing bubbles from being mixed into a molten metal and eliminating the formation of a hollow portion in a metal part of the header, and a method of manufacturing the header.

[0006]

To achieve the above object, a method for manufacturing a header according to the first aspect of the present invention comprises:
At the open end of the cylindrical header body, there is formed a pipe connection portion that allows connection of piping to the header main body, and on the outer surface of the header main body, there is a tubular branch pipe communicating with the inside of the header main body. A method for manufacturing a header made of a metal material, wherein a plurality of formed headers are configured so that a branch pipe can be connected to the branch pipe by a connection portion provided in the branch pipe,
In order to prevent air bubbles from being mixed in the molten metal material, the molten metal is formed into a predetermined shape by a continuous casting method.
A second step of cutting the molded body into a predetermined length to form a slab, a third step of cutting the slab to form outer shapes of the branch pipe and the header body, and a slab. A fourth step of forming the internal shape of the branch pipe by cutting off the inside of the pipe, and a fifth step of forming the pipe connection portion at the open end of the header body.
Process.

According to a second aspect of the present invention, there is provided a header manufacturing method according to the first aspect.
A pair of opposing holding surfaces enabling the holding of the slab by the holder for regulating the movement of the slab in the step are formed on the outer surface of the formed body in the first step.

According to a third aspect of the present invention, there is provided a header manufactured by the method for manufacturing a header according to the first or second aspect, wherein the connecting portion is connected to a branch pipe of a branch pipe. A stopper member provided in the branch pipe for restricting the escape and a cap connected to the branch pipe for positioning the stopper member in the branch pipe or a cap connected to the branch pipe with the stopper member provided therein. Wherein the branch pipe and the cap or the branch pipe and the joint can be connected to each other using a threaded connection or a connecting member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the header will be described. As shown in FIG. 1A, a header 11 made of a metal material includes a header main body 12 having a tubular shape, a female screw portion 13 serving as a pipe connection portion, and a plurality of branch tubes 14 having a tubular shape. Things. Also, the branch pipe 14
The lock ring 19 as a retaining member provided in the branch pipe 14 and the lock ring 19 are connected to the branch pipe 1.
A connection portion 15 including a cap 22 connected to the distal end of the branch pipe 14 is provided for positioning in the inside 4.

As shown in FIG. 1A, a flow passage 12a extending in the length direction of the header main body 12 is formed through the inside of the header main body 12. FIG.
As shown in (b), on the outer surface of the header main body 12, a holding surface 16 is formed on each of both side end surfaces, and the flat surface portions are parallel to each other. FIG.
As shown in (a), both holding surfaces 16 are connected to the header main body 12.
Are formed so as to extend continuously in the length direction of the hologram. As shown in FIG. 5, the female screw portions 13 are threaded on the inner peripheral surfaces of the open ends on both sides of the header main body 12, respectively.

The branch pipes 14 are respectively connected to the header main body 1.
2 is formed in a tubular shape communicating with the flow path 12a, and the inner peripheral surface on the base end side of each branch pipe 14 is
An abutment surface 17 which is formed in an annular shape and extends to the center of the inside of the ring is formed. An annular groove 18 is provided at two places on the inner peripheral surface of the branch pipe 14 at the distal end side from the contact surface 17.
As shown in (a), a seal ring 18a made of a rubber material is fitted in each annular groove 18.

As shown in FIG. 5, an engagement surface 20 is formed along the inner peripheral surface on the tip side of the annular groove 18. As shown in FIG. 1A, the lock ring 19 is engaged on the engagement surface 20. The lock ring 19 includes an annular base ring (not shown) and a plurality of claws (not shown) protruding from the inner periphery of the base ring. 20.

Further, an inner screw 21 is threaded on an inner peripheral surface of the branch pipe 14 on the distal end side with respect to the engagement surface 20. The cap 22 has a substantially cylindrical shape, and an annular locking projection 22a is formed at the upper end thereof, and the locking projection 2a is formed at the lower end thereof.
A pressing cylinder portion 22b having a diameter smaller than that of 2a is formed.
An outer screw 23 is threaded on the outer peripheral surface of the pressing tube portion 22b. The outer screw 23 is screwed to the inner screw 21 so that the cap 22 is screwed to the branch pipe 14.

Then, the base ring is pressed against the engaging surface 20 by the pressing tube portion 22b, whereby the lock ring 19 is positioned and fixed in the branch pipe 14, and the cap 2
2 and the lock ring 19 connect the connecting portion 15 to the branch pipe 14.
Provided within. A substantially cylindrical core ring 25 is fitted inside a synthetic resin pipe 24 serving as a branch pipe, and an annular flange 25 a formed at one edge of the core ring 25 is provided on the pipe 24. It is in contact with the outer end face.

When using the header 11 provided with the connecting portion 15 having the above structure, first, a water supply pipe (not shown) is connected to one of the female screw portions 13, and a closing member (not shown) is connected to the other female screw portion 13. (Not shown) and the other opening of the header 11 is closed. In addition, the pipe 24 is the coring 2
5 through the cap 22 from the side where
It is inserted until the flange 25a contacts the contact surface 17.

As a result, in the connecting portion 15, the claw pieces of the lock ring 19 bite into the outer peripheral surface of the pipe 24, and the pipe 24 is prevented from coming out of the branch pipe 14, so that the pipe 24 is connected to the branch pipe 14, that is, the header 11. Connected. At this time, water leakage from between the outer peripheral surface of the pipe 24 and the inner peripheral surface of the branch pipe 14 is regulated by the pair of seal rings 18a. Then, the water supplied from the water supply pipe into the header 11 is branched in three directions by the branch pipe 14 and supplied to the faucet equipment to which the pipe 24 is connected.

Next, a method of manufacturing the header 11 having the above configuration will be described. The method for manufacturing the header 11 is as follows.
The first step is to mold the molten metal into a molded article of a predetermined shape by a continuous casting method in order to prevent air bubbles from being mixed into the molten metal material, and the second step is to mold the molded article. Is cut into a predetermined length to form a cast slab.
The third step is to cut the outer surface of the slab to form the outer shapes of the branch pipe 14 and the header body 12.
The step is to cut the inside of the slab to form the internal shape of the branch pipe 14, and the fifth step is to form the female screw portion 13 at the open end of the header body 12.

More specifically, in the first step, in a continuous casting method, a metal material such as bronze or stainless steel is melted in a melting furnace to prepare a molten metal, and the molten metal is placed on a top of a mold. Supply within. Then, the molten metal in the dandishes flows down into the mold, and the outer shell solidified slab precipitates from the lower part of the mold. The molded body is molded, and the first step is completed. The shape and the like of the mold are set so that the flow path 12a is formed inside the molded body. In the first step,
The holding surface 16 is formed on the outer surface of the formed body.

In the first step, the molten metal is caused to flow down into the mold by gravity by a continuous casting method, and the molten metal is extruded from the mold by gravity. Therefore, as in the case where the molten metal is filled in a space (cavity) having a fixed capacity and the molten metal is solidified only in that space, air in the space is mixed into the molten metal and bubbles are formed. Disappears. Therefore, since the molten metal in which air is not mixed is solidified to obtain a molded body, it is possible to prevent a cavity portion from being formed by bubbles in the metal part of the molded body.

Next, the molded body is cut into a predetermined length, and a second step is performed. As shown in FIG. 2A, a substantially rectangular cylindrical cast piece 26 having a predetermined length is formed. You. Next, in order to perform the third to fifth steps, first, as shown in FIG. 2B, the holder 2 capable of holding both the holding surfaces 16 of the cast piece 26 is used.
The pair of holding arms 28 are moved away from each other. Next, as shown in FIG. 2C, the pair of holding arms 28 are brought close to each other, and the slab 26 is held by the two holding arms 28. At this time, the holding surface 16
The holding of the slab 26 by the holding arm 28 is performed in a stable state.

Subsequently, the portions (excess portions) indicated by hatching in FIGS.
A portion corresponding to the external shape of the branch pipe 14 is cut out, and a header main body 12 is formed on the base end side of the branch pipe 14 to form a third part.
A process is performed. Next, as shown in FIG. 5, the inside of each slab 26 is cut off from one side of the slab 26, that is, the tip side of each branch pipe 14 by using a cutting tool, and an inner screw is formed on the inner peripheral surface of the branch pipe 14. A fourth step of forming 21, the engagement surface 20, the annular groove 18, and the contact surface 17 is performed.

Next, the inside of both open ends of the header main body 12 is cut off using a cutting tool, and female threads 13 are formed on each of them, and a fifth step is performed. As a result,
The slab 26 formed by the continuous casting method through the fifth step
Then, the header body 12 and the branch pipe 14 are formed, and the header 11 is manufactured. The seal ring 18a and the lock ring 19 are attached to the header 11, and the cap 22
Is connected to the branch pipe 14, so that the header 11 can be used.

The effects exhibited by the above embodiment will be described below. A molded body was formed by a continuous casting method without mixing air into the molten metal, and a slab 26 obtained by cutting the molded body was cut off to form the branch pipe 14 and the header main body 12, thereby manufacturing the header 11. Therefore, it is possible to prevent a hollow portion from being formed in the metal portion of the header 11. Therefore, when the header 11 is used, the header 11
It is possible to eliminate the problem that the water flowing inside leaks out of the header 11 through the hollow portion or that the header 11 is damaged from the hollow portion when the header 11 receives an external force.

Further, unlike the conventional header 11 manufactured by a sand casting method and having a hollow portion formed in the metal portion, the thermal conductivity of the header 11 is reduced by the hollow portion formed in the metal portion. Can be eliminated. Therefore, for example, when water is circulated in the header 11 in summer, the entire header 11 is rapidly cooled by the water, and the time that the water that has passed through the header 11 heated by the outside air temperature is warmed by the header 11 is shortened. Can be.

The branch pipe 14 and the header main body 12 are formed by cutting off excess portions of the slab 26 formed by the continuous casting method. Therefore, the weight of the header 11 can be reduced as compared with the case where the inner screw 21, the engagement surface 20, the annular groove 18, and the like are formed in the slab 26 without removing the excess thickness portion.

The holding surface 16 can be held in a stable state by the holding member 27, and the movement of the slab 26 during the third to fifth steps can be restricted. Therefore, the branch pipe 1
4. The work of forming the female screw portion 13 can be performed in a stable state, and the error in the dimension of the shape of the header 11 can be reduced.

Since the holding surface 16 is formed continuously in the length direction of the slab 26, the slab 26 can be held by the holder 27 at an arbitrary position. Therefore, unlike the case where the holding surface 16 is formed only at one place on the outer surface of the cast piece 26, when holding the holding surface 16 with the holding tool 27, it is not necessary to confirm the position of the holding surface 16 and the holding by the holding tool 27 Work can be performed quickly.

The present embodiment can be embodied with the following modifications. Forming the cap 22 into a cap nut shape;
And the branch pipe 14 with the inner screw 21 of the cap 22 and the branch pipe 1
4 may be connected by screwing with the outer screw 23. That is,
The cap 22 is formed in a substantially cylindrical shape, and an inner screw 21 is threaded on an inner peripheral surface thereof. From the inner bottom surface of the cap 22, a pressing cylinder portion 22b concentric with the outer peripheral surface of the cap 22 is extended, and an annular gap is formed between the pressing cylinder portion 22b and the inner screw 21. . On the other hand, branch pipe 1
In No. 4, the outer thread 23 is formed by cutting off the outer peripheral surface on the distal end side of the branch pipe 14 in the third step, and the inner screw 21 is not formed in the fourth step. Then, by screwing the inner screw 21 of the cap 22 and the outer screw 23 of the branch pipe 14, the lock ring 19 is positioned in the branch pipe 14 by the pressing tubular part 22 b, and the connecting part 15 is connected to the branch pipe 14. Is provided.

Lock ring 19 as a retaining member
Use a split ring (not shown) in place of
2 and the branch pipe 14 are connected by screwing an inner screw 21 of the cap 22 and an outer screw 23 of the branch pipe 14,
A connection portion 15 may be provided in the branch pipe 14 by the split ring and the cap 22.

For example, the cap 22 is formed in a cylindrical shape whose diameter decreases toward one end thereof, and an inner screw 21 is threaded on the inner peripheral surface of the other end. On the other hand, in the header 11, at the third step, the outer peripheral surface on the distal end side of the branch pipe 14 is cut off to form the external thread 23. The split ring has a substantially cylindrical shape whose diameter decreases toward one end, and one side of the split ring is cut out.

In the case of such a configuration, first, the pipe 2
Then, the cap 22 is fitted to the outside of the pipe 4, then the split ring is fitted to the other end from the other end, and the pipe 24 is inserted into the branch pipe 14. Next, the cap 22 is screw-connected to the branch pipe 14. Then, the diameter of the split ring is reduced as the cap 22 advances, and the split ring is tightened and fixed to the outer peripheral surface of the pipe 24. When the screwing of the cap 22 is completed and the split ring is positioned in the branch pipe 14, the pipe 24 is connected to the branch pipe 14 in a state where the pipe 24 is prevented from coming off by the split ring.

As shown in FIG. 6, the branch pipe 14 and the cap 22 may be connected using a clip 29 as a connecting member. That is, in the header 11, the third
At the time of the process, a locking portion 30 projecting outward is formed on the outer peripheral surface on the distal end side of the branch pipe 14. At the time of the fourth step, the inner screw 21 is not formed on the inner peripheral surface of the branch pipe 14 and the branch pipe 14
The inside is formed so that the pressing tube portion 22b can be fitted inside. Further, the outer screw 23 of the pressing tube portion 22b of the cap 22 is omitted.

The clip 29 is formed of a substantially strip-shaped stainless steel at its center to form a hinge (not shown), and is bent and formed into a substantially C-shape with both ends being biased by the hinge so as to approach each other. ing. Clip 29
Locking pieces 31 are continuously formed on both side edges along the length direction of the clip, and knobs 32 are formed on both ends of the clip 29 by bending.

Then, the pressing cylindrical portion 22b of the cap 22 is fitted inside the branch pipe 14, and the outer peripheral surface of the locking portion 30 and the locking projection 2 are formed.
2a so as to be flush with the outer peripheral surface. Next, the clip 29 is opened so that the knobs 32 are separated from each other,
The locking portion 30 and the locking protrusion 22 between the opposite locking pieces 31
a, and the clip 29 is returned to the original state by the urging force of the hinge. Then, the upper locking piece 31 is fixed to the locking projection 22.
a along the circumferential direction of the upper end surface, and the lower locking piece 31
Locks along the circumferential direction of the lower end surface of the locking portion 30. As a result, the locking portion 30 and the locking protrusion 22a are connected in a state of being in close contact with each other by the pair of locking pieces 31, and the cap 22 is prevented from coming out of the branch pipe 14.
Further, the lock ring 19 is positioned in the branch pipe 14 by the pressing cylinder portion 22b, and the connection portion 15 is provided by the cap 22 and the lock ring 19. Therefore, both can be easily connected without forming the outer screw 23 of the cap 22 and the inner screw 21 of the branch pipe 14.

As shown in FIG. 7, a joint 35 having a lock ring 19 therein and the branch pipe 14 are connected using the clip 29, and the branch pipe 1 is connected by the joint 35.
4 may be provided with a connection portion 15. In the header 11, at the time of the third step, the locking portion 3 is attached to the outer peripheral surface of the branch pipe 14.
0 is formed, and at the fourth step, on the inner peripheral surface of the branch pipe 14,
The annular groove 18, the engagement surface 20, and the inner screw 21 are not formed.

On the other hand, the joint 35 is constructed by combining a joint main body 36 and the cap 22.
Specifically, the joint main body 36 has a substantially cylindrical shape, and the same annular groove 18 provided in the branch pipe 14 is formed at two places on the outer peripheral surface on one end side thereof. Are each fitted with the seal ring 18a. On the outer peripheral surface at the center of the joint body 36, a locking flange 37 extends outward along the circumferential direction of the joint body 36.

The branch pipe 1 is provided on the inner peripheral surface of the joint body 36.
4, the same abutment surface 17, the annular groove 18,
An engagement surface 20 and an internal thread 21 are formed. A seal ring 18a is fitted in each of the annular grooves 18. Then, the lock ring 19 is accommodated in the joint main body 36, and the cap 22 is screw-connected to the joint main body 36 to form the joint 35, and the joint 35 forms the connecting portion 15.

Then, using the joint 35, the branch pipe 1
In order to connect the pipe 4 to the pipe 4, first, one end of the joint body 36 of the joint 35 is inserted into the branch pipe 14, and the engaging portion 30 and the engaging flange 37 are brought into surface contact. Next, the locking portion 30 and the locking flange 37 are arranged between the locking pieces 31 of the clip 29 facing each other, and the locking portion 30 and the locking flange 37 are sandwiched by the locking pieces 31. As a result, the joint 35 is connected to the branch pipe 14.
And the clip 29 restricts the joint 35 from coming out of the branch pipe 14, and the connection part 15 by the joint 35 is provided in the branch pipe 14.

Finally, the joint 35 connected to the branch pipe 14
By inserting the pipe 24 therein, the pipe 24 is connected to the joint 35 in a state where the pipe 24 is prevented from falling off by the lock ring 19, and the pipe 24 is connected to the branch pipe 14 via the joint 35. Further, the pair of seal rings 18a on one end side of the joint 35 seals between the inner peripheral surface of the branch pipe 14 and the outer peripheral surface of the joint 35, thereby suppressing leakage of the fluid flowing in the header 11.

The outer thread 23 is threaded on the outer peripheral surface on one end side of the joint body 36, and the inner screw 21 which can be screwed with the outer screw 23 is threaded on the inner peripheral surface of the branch pipe 14. The tube 14 may be connected by a screwing relationship. Alternatively, one end of the joint body 36 is formed in a cylindrical shape, the inner screw 21 is threaded on the inner peripheral surface, and the outer screw 23 that can be screwed with the inner screw 21 is threaded on the outer peripheral surface of the branch pipe 14. , The joint 35 and the branch pipe 14 may be connected in a screwing relationship.

In the embodiment, after the outside of the branch pipe 14 is cut in the third step, the inside is cut in the fourth step. However, the outside and the inside of the branch pipe 14 may be cut simultaneously.

In the embodiment, the holding surface 16 is formed on the outer surface of the header body 12, but the holding surface 16 may be omitted. Further, the holding surface 16 is formed continuously along the length direction of the slab 26, but the holding surface 16 may be formed at a predetermined interval or an arbitrary interval, and the holding surface 16 may be provided at only one position. The surface 16 may be formed.

In the embodiment, the cap 22 and the branch pipe 14 can be connected by a screwing relationship, but they may be connected by brazing. In the embodiment, three branch pipes 14 are attached to the header main body 12.
Although the branch pipe 14 is formed at one place, two places or four places
More than two places may be formed.

In the embodiment, the female screw portion 13 is formed on the header main body 12 as a pipe connection portion. However, a male screw portion as a pipe connection portion may be formed on the outer peripheral surface of the open end of the header main body 12.

In the embodiment, the water supply pipe is connected to the header 11 to circulate the water. However, the hot water supply pipe may be connected to the header 11 to circulate the hot water. Steam, oil or the like may be circulated.

Further, a technical idea which can be grasped from the embodiment will be described below. The method of manufacturing a header according to claim 2, wherein the holding surface is formed continuously along the length direction of the molded body. With this configuration, only one holding surface is formed on the slab, and there is no need to check the position of the holding surface and hold the slab with the holder. Therefore, the work of holding the cast slab by the holder can be performed quickly.

The header according to claim 3, wherein the retaining member is a lock ring having an annular shape and having a plurality of claw pieces protruding inward. In the case of such a configuration, the claw piece is engaged with the outer surface of the branch pipe inserted and connected into the branch pipe, so that the branch pipe can be effectively prevented from coming out of the branch pipe.

[0048]

The present invention is configured as described above, and has the following effects. According to the first aspect of the present invention, it is possible to prevent air bubbles from being mixed into the molten metal and eliminate the formation of a hollow portion in the metal portion of the header.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the slab can be stably held by using the holder. Therefore, unlike the case where the holding surface is not formed, it is difficult to move the slab during the third to fifth steps, so that the branch pipe forming operation and the like can be performed in a stable state.

According to the third aspect of the present invention, it is possible to set a plurality of types of connection methods between the branch pipes and the branch pipes, thereby expanding the range of use of the header.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional view illustrating a header including a connection portion, and FIG. 1B is a side view illustrating a header including a connection portion.

2A is a front view showing a slab, FIG. 2B is a side view showing a state before the slab is held by a holder, and FIG. 2C is a side view showing a state where the slab is held by a holder. Side view.

FIG. 3 is a front view showing a cut portion of a slab, a branch pipe, and a header main body.

FIG. 4 is a plan view showing an outer shape of a cut portion of a cast slab and a branch pipe.

FIG. 5 is a sectional view showing the inside of the header body and the inside of the branch pipe.

FIG. 6 is a partial sectional view showing a connection state between another example of a branch pipe and a cap.

FIG. 7 is a partial cross-sectional view showing a connection state between another example of a branch pipe and a joint.

[Explanation of symbols]

11 ... Header, 12 ... Header main body, 13 ... Female screw part as piping connection part, 14 ... Branch pipe, 15 ... Connection part, 1
6 ... holding surface, 19 ... lock ring as a retaining member constituting the connection part, 22 ... cap constituting the connection part,
24: Pipe as a branch pipe, 26: Cast piece, 27: Holder, 29: Clip as a connecting member, 35: Joint as a connecting part.

Claims (3)

[Claims] A pipe connecting portion is formed at an opening end of a cylindrical header main body so that a pipe can be connected to the header main body, and an outer surface of the header main body communicates with the inside of the header main body. A plurality of branch pipes are formed, and a connection portion provided in the branch pipes is a method of manufacturing a header made of a metal material configured to be able to connect the branch pipes to the branch pipes. In order to prevent air bubbles from being mixed, the first step is to form a molten metal into a molded body of a predetermined shape by a continuous casting method.
A second step of cutting the molded body into a predetermined length to form a slab, a third step of cutting the slab to form outer shapes of the branch pipe and the header body, and a slab. A fourth step of forming the internal shape of the branch pipe by cutting off the inside of the pipe, and a fifth step of forming the pipe connection portion at the open end of the header body.
A method for manufacturing a header, comprising: 2. A pair of opposing holding surfaces enabling the holding of the cast slab by a holder for regulating the movement of the cast slab in the third to fifth steps are formed on the outer surface of the formed body in the first step. The method for manufacturing a header according to claim 1, wherein the header is formed. 3. A header manufactured by the method for manufacturing a header according to claim 1 or 2, wherein the connecting portion is provided in the branch pipe to restrict a branch pipe from coming out of the branch pipe. The branch pipe is constituted by a provided stopper member and a cap connected to the branch pipe for positioning the stopper member in the branch pipe or a joint connected to the branch pipe with the stopper member provided inside. And a cap or a branch pipe and a joint which can be connected by using a threaded connection or a connecting member, respectively.