JP2003164925A - Manufacturing method for metal pipe material component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the degree of freedom in shaping and the quality of sealing of a blocked part in a manufacturing method for a metal pipe material component. <P>SOLUTION: According to the manufacturing method for the metal pipe material component, an end 2 of a metal pipe material is pressed to form a sealed part 3. After that, a pressure is applied to the interior 5 of the metal pipe material 1 so as to expand the pipe material 1 until it comes in contact with a die 4 arranged on the outside of it, thus a desired shape of the metal pipe material component is formed. In the manufacturing method, the process of pressing is executed concurrently as a plurality of separated portions of the die are closed, and an intervening layer is included in the portion of metal pipe material comprising the sealed part. <P>COPYRIGHT: (C)2003,JPO

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 metal pipe material part for manufacturing a part in which an opening of an end face of a metal pipe material is closed.

[0002]

2. Description of the Related Art Conventionally, there are various methods for manufacturing a part in which an opening of an end surface of a metal pipe material is closed. For example, as shown in FIG.
As shown in FIG. 5, there is one in which a lid is joined to the end surface.

[0003] In press forming by press, trial and error are required to determine the shape before press working, it takes time to start up production, and there is a limit to the shape that can be raised in rise forming, and there is an opening. It is also restricted in terms of the degree of freedom in shape such that the part 7 is formed.

Further, in the method of joining the lid 8 or the like to the end face shown in FIG. 5, the joining of the lid 8 or the like is not easy and there is a problem in productivity, and the cost of parts of the lid 8 and the like is additionally required. There is a cost problem.

Therefore, as shown in FIG. 6, the opening at the end of the metal pipe material is closed by closing the end face.

In this method of closing by closing molding, since closing molding is performed by rotational movement, there is a limit to the shape, there is a restriction in the shape freedom surface, and the center of rotation 9 is imperfect. There is a quality problem that makes it easy to get a perfect seal.

The present invention has been made to solve the above problems, and an object thereof is to improve the degree of freedom in shape and the quality of sealing of a closed portion in a method of manufacturing a metal pipe part.

[0007]

In order to achieve the above object, the present invention is to press an end surface of a metal pipe material to form a seal portion, and then apply pressure to an inner portion of the metal pipe material so that the outer surface of the metal pipe material is exposed. A desired shape is formed by expanding until it comes into contact with the mold arranged in the above.

According to the present invention, the end face opening of the metal pipe material is closed by a simple press, the sealing portion is secured, and the metal pipe material is plastically deformed by bulging in a mold having a cavity designed to have a desired shape. In the series of steps, the reliability and the degree of freedom of the shape of the seal can be combined.

Further, the seal portion is formed by pressing by arranging an end portion of the metal pipe material between a plurality of divided dies, and by closing the dies by a fastening force between the dies. As a result, it is not necessary to form the seal portion before the mold is put in, so that the production efficiency is improved.

Further, in order to improve the reliability of the seal in the portion constituting the seal portion, a soft metal thin film or the like is interposed before the pressing and an intervening layer is formed after the pressing, so that the leak path is surely closed. It is possible. Instead of the thin film, the intervening layer may be formed by coating a metal that can diffuse into the base metal and firmly join the base metal tube.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. 1 shows a manufacturing method of the present invention, FIG. 1a is a cross-sectional view of a metal pipe material before pressing, FIG. 1b is a cross-sectional view after pressing the metal pipe material, and FIG. Diagram of bulge processing that applies pressure by introducing fluid etc. FIG. 1d is an end cross-sectional view of a metal pipe material component manufactured by the present invention.

Next, regarding the manufacturing process, referring to FIG.
This will be explained sequentially. First, the end surface 2 of the metal pipe material 1 is pressed to form the seal portion 3 and the end surface 2 is sealed (FIG. 1b). At this time, a soft metal thin film is interposed on the inner wall of the pipe that forms the seal part at the end of the metal pipe material, or metal fine particles are interposed, so that the press load is insufficient and a minute gap is formed. Even if it is done, the inclusion can fill the void to ensure a reliable seal. For example, when a copper alloy such as brass is used, a sheet such as Sn or Pb is interposed, or a metal such as Sn that can diffuse into the copper alloy and form a diffusion bond in the seal portion is coated. May be. At this time, by partially heating the seal portion, the metal can be surely diffused.

Next, the metal pipe 1 having the seal portion 3 formed thereon is held by the mold 4, air or fluid is introduced from the opening of the metal pipe 1, and bulging is performed. In the mold 4, the metal pipe material 1 is located in the cavity 4a that constitutes the desired external shape of the final product.
Expands due to an increase in internal pressure due to the introduction of a fluid, spreads throughout the cavity, and finishes molding. Generally, the bulging process imposes a design load on the mold seal,
Since the metal pipe material whose ends are already sealed is used, a simpler design can be performed than the conventional mold design by bulging. At the time of processing, the material is pressed against the opening end side toward the seal portion 3 side, so that it is possible to prevent material breakage during plastic deformation of the metal pipe material. As long as the material has excellent ductility at low temperature, such as a copper alloy such as brass, cold working may be used, but hot working that has been performed may be used.

The sealing step of FIG. 1b and the introduction of the metal pipe material of FIG. 1c into the mold may be performed in one step. Specifically, the mold 4 is separated into an upper mold and a lower mold, When closing the upper mold and the lower mold, the end portions of the metal pipe material may be aligned between the upper mold and the lower mold, and the sealing force may be pressed by the fastening force at the time of closing.

FIG. 1d is an example in which an unnecessary part of the seal portion 3 is cut off and the appearance is adjusted. If the internal pressure during use of the product after cutting is high, the airtightness may be further enhanced by applying brazing. Since the appearance is often plated, the brazing part impairs the appearance. There is no such thing.

According to the above steps, a free shape can be provided only by appropriately designing the shape of the mold, and for example, as shown in FIG. 2, a complicated shape such as the water spout connection portion 6 of the faucet metal fitting can be provided. It can also be shaped. In this case, when introducing the metal pipe material having the seal portion formed in the mold, it is desirable to previously form the seal portion in accordance with the shape of the mold. It is only necessary to shape such a shape. Also, in this application, since it will be used on the secondary pressure side of the water supply, a seal can be secured even by forming the seal part by a simple press, and the material is a soft material that can be handled by cold working, so productivity is improved. It is an excellent and desirable application.

In addition to the above-mentioned methods, the sealing portion may be formed by a method suitable for the material of the metal pipe material, and the reliability of the sealing portion may be improved by combining these methods. , As described above.

[0018]

According to the present invention, it is possible to provide a metal pipe material component having an arbitrarily closed end portion without impairing the reliability of the seal at the closed portion.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is an external view illustrating a part of the manufacturing process of the present invention.

FIG. 4 is a diagram showing a conventional press raising method.

FIG. 5 is a diagram showing a conventional method for joining lids and the like.

FIG. 6 is a diagram showing a conventional closing method.

[Explanation of symbols]

1 ... Metal tubing 2 ... end face 3 ... Seal part 4 ... Mold 5 ... Inside metal pipe 6 ... Spout connection 7 ... Opening 8 ... Lid, etc. 9 ... Center of rotation

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, finger sucking             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. (72) Inventor Kazuhisa Tateishi             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. (72) Inventor Hiroshi Nojima             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd.

Claims (3)

[Claims] 1. A desired shape is obtained by pressing an end surface of a metal pipe material to form a seal portion, applying a pressure to an inner portion of the metal pipe material, and expanding the metal pipe material until it comes into contact with a die arranged outside the metal pipe material. A method for manufacturing a metal pipe material part, which comprises molding a shape. 2. The method of manufacturing a metal pipe part according to claim 1, wherein the pressing is performed at the same time when a plurality of divided dies are closed. 3. The method of manufacturing a metal pipe material component according to claim 1, wherein an intervening layer is arranged in the seal portion.