JPH02154890A - Connecting method for fine-diameter metal tube - Google Patents

Abstract

PURPOSE:To omit the tack work of spot welding or the like by contact-fixing pipelines with the shrinkage of circular hole sections of a metal tool via the pressing of outer peripheries of the pipelines while pipeline end sections are inserted and set into multiple circular hole sections of the metal tool. CONSTITUTION:For the connecting method of fine-diameter metal pipelines P1 and P3, the pipelines P1 and P3 are inserted and set into circular hole sections 2' and 2'' of a metal tool 1 at a gap between end sections. The metal tool 1 is a receiving mold with a notch groove, and it is a short bottomed cylinder body 1. Multiple circular hole sections 2' and 2'' are inserted into the peripheral wall section of the bottomed cylinder body 2 to face the notch groove. A pressing mold provided to face the receiving mold when it is set is pressed, the circular hole sections 2' and 2'' are contact-fixed to the pipelines P1 and P3 side, then the other communicating pipe P' is inserted into the opening end section of the cylinder body 2, and they are brazed 6, 6', 6'' together. As a result, the connection work of fine-diameter metal pipes is sharply improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to fuel injection type automobiles, such as inlet tubes, fuel delivery pipes, or branch supply paths for refueling and air supply to various machines and devices. The present invention relates to a method for connecting metal pipes having a relatively small diameter of about 20 m/m or less, which are arranged as pipes.

Conventionally, as shown in FIGS. 10 and 11, this type of connection method, for example, a T-type connection, has been used to connect a communication hole (13) provided in the peripheral wall of a pipe (Plo) to the other communication pipe (P2). '
) is placed on the welding jig with the opening-shaped wrinkled wall (12) formed by press working applied to the connecting end of the The tacking process is carried out, and then the overlapping surfaces are welded together (4) to connect them, or the first
As shown in Figure 2, a T-shaped joint (21) formed by cutting, casting, or forging with a bar material is used to assemble the inside of the mutually penetrating shaft cores using holes (22", 22'', 22°°
In the set state where the separate pipes (Pl, +PI,) and the ends of the communication pipe (P2,) are fitted into the sections (2) and 2, the ends of the separate pipes (Pl, +PI,) and the communicating pipe (P2, work, and then solder weld the fitting part (W', W", W"')
This was based on the method of connecting the

[Problems to be Solved by the Invention] However, in such a conventional technique, in the former case, the wrinkled wall (12) is welded with solder (
W), there is generally a deterioration in the connection strength, often leading to leakage in the arrangement under vibration suspension, and the lack of proper communication pipes (W).
Temporary attachment on a welding jig by welding, etc. related to the connection position on the P2") side requires work, which has the problem of making the work troublesome.

In addition, in the latter case, assembly is performed using holes (2) in connection with arc welding.
2', 22", 22 "") requires a high degree of dimensional accuracy for fitting, making dimensional control difficult, and at the same time, similar temporary fitting as described above poses the problem of significantly hindering workability. It was something that I had.

The present invention has been made in view of the above-mentioned problems of the prior art, and eliminates any problems such as spot welding or plasma arc welding as in the prior art, including solder welding on the other side of the communicating pipe. Temporary attachment eliminates the need for work, improves work efficiency by eliminating the hassle of these works, and at the same time eases the mutual dimensional accuracy between the circular hole and the outer circumferential surface of the pipe, making management easier. The purpose of this paper is to propose a method for connecting small-diameter metal pipes that makes it possible to connect pipes with different diameters or to connect the pipes eccentrically.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention inserts the cutout into a receiving mold provided with a cutout groove, and attaches the cutout to the circumferential side wall of a bottomed cylindrical body having a short dimension. A pipe is passed through the circular hole portion of a metal fitting having at least two circular holes so as to correspond to the notch groove so that the end portions of the pipe are spaced apart from each other, and further, in this state, the metal fitting is opposed to the receiving mold. By pressing from the peripheral edge of the open end of the cylindrical body with a pressing die provided in the cylindrical body, the circular hole portion is brought into contact with and fixed to the outer circumferential surface of the piping side, and then, after being taken out from the receiving die, the opening end of the cylindrical body is pressed. The gist is a method of connecting small diameter metal tubes in which the other communicating tube is inserted and connected by solder welding to each other, and further, the open end layer surface portion is also subjected to drawing processing by pressure from the peripheral edge of the open end, It is also constructed by connecting pipes with different diameters or by connecting pipes eccentrically in the axial direction of the metal fitting.

[Function] Since the present invention is based on the connection method described above, a plurality of piping ends are passed through the circular hole on the metal fitting side, and the ends are set at a distance from each other, so that the proper fit on the mold is achieved. In addition, the pressure in the set state reduces the diameter of the circular hole part and brings it into contact with the outer peripheral surface of the pipe, so temporary attachment by welding etc. as in the conventional technology is not a work. This eliminates the need for solder welding to the communicating pipe through the communicating hole, reducing the troublesome work of soldering welding and improving work efficiency. This will ease the mutual dimensional accuracy and facilitate its management.

Embodiment] Below, embodiments of the present invention will be described based on the drawings.
The figure is a side view of a connection part configured by the method for connecting small diameter metal tubes of the present invention, FIG. FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 5 is a plan view of the receiving mold according to the connection method, and FIG. 6 is a plan view showing another embodiment of the present invention, FIG. 7 is a sectional view showing a connection method of another embodiment of the present invention, and FIGS. 8 and 9 are further diagrams. FIG. 2 is a diagram corresponding to another embodiment, in which (1) shows an open end (3
), and is formed by pressing a metal plate or cutting a metal rod, and has a plurality of circular holes (2) in the circumferential side wall of the cylinder. ', 2°“.

2°°゛). Cylindrical body (2) of the metal fitting (1)
Piping (P work, P
2, PI) and are set so that the ends are spaced apart from each other in the metal fitting (1). Then, in the set state, the metal fittings (1) and piping (Pt
, P2, PI) on the left and right sides of the circular hole (2°, 2°"2
+++) part of the receiving mold (4), which is inserted into the notched groove (4', 4'', 4°゛) connected to the concave groove part, and is provided opposite the receiving mold (4). The peripheral edge of the open end (3) of the cylindrical body (2) is pressed by the pressing die (5) to form a circular hole (
By reducing the diameter of the parts 2', 2', and 2'', they are fixed in contact with the outer circumferential surface of the piping (Pi, P2, PI) side.The metal fitting (1) is attached to the receiving mold (4). After inserting the pipes (Pi, P2, h) into the circular hole (1) of the fitting (1)
2°, 2°+, 2+++) and set in the same manner as described above, and pressing may be performed using the backing type (5).

Further, (6, 6', 6", 6"') is solder welded, and after being taken out by the receiving mold (4) after the abutting and fixing, the open end (3) of the cylindrical body (2) to the other communicating pipe (Po)
This is done after inserting the Reference numeral (7) denotes a push rod, which is located at the bottom of the groove of the receiving mold (4) and moves up and down to facilitate the removal of the metal fitting (1).

Although three pipes have been described in the illustrated embodiment, it is also possible to connect two or four or more pipes according to the present invention, and as shown in FIG. It is also possible to arbitrarily set the connection angle (α) to the pipe for connection, and as shown in Fig.
) is smaller in diameter than the inner diameter of the metal fitting (1), the communication pipe (P
o) can be fitted and inserted, and the peripheral surface of the opening end can also be drawn at the same time by pressing with the press die (5).Also, as shown in Fig. It is also possible to connect the pipes (Pi, P2, PI) eccentrically at an arbitrary interval of 1, or at an arbitrary angle (β) as shown in Fig. 9. In this case, the circular hole (2°) is now 1 vertically long. It is penetrated in an oval shape. The term "circular hole" used in the present invention includes such an elliptical hole.

[Effects of the Invention] As explained above, the method for connecting small diameter metal pipes according to the present invention is to penetrate the ends of the plurality of circular holes (2° 20, 2° pa) on the metal fitting (1) side. In the set state, connect the fittings to the piping (
P, ,P2. Since the outer circumferential surface of p, ) is brought into contact with and fixed by the diameter reduction in the circular hole portion by pressing, the spot can be properly positioned on the receiving mold (4) depending on the condition of the cera 1. All temporary attachment work by welding or plasma arc welding, etc. and subsequent welding work can be eliminated, reducing the troublesomeness of these works and greatly improving work efficiency. Circular holes (2°, 2°", 2°゛°) and piping (PI,
P2, PI) It is possible to ease the mutual dimensional accuracy with the outer circumferential surface and make its management easier, and it is also possible to connect piping with different diameters, and it is also possible to connect piping eccentrically in the axial direction. This is an extremely useful method for forming T-type connections in small diameter metal tubes.

[Brief explanation of the drawing]

Fig. 1 is a side view of a connecting part constructed by the method for connecting small diameter metal tubes of the present invention, Fig. 2 is a partial vertical sectional view showing the main parts of the present invention in Fig. A plan view of a receiving mold according to the connection method of the invention, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG.
The figure is a partial longitudinal cross-sectional view showing the state before pressing when inserted into the receiving mold during the molding shown in Fig. 1, Fig. 6 is a plan view showing another embodiment of the present invention, and Fig. 7 is the present invention. 8 and 9 are views corresponding to FIG. 2 of yet another embodiment of the present invention, and FIG. 10 is a sectional view showing a conventional example of a T-type connection. A side view, FIG. 11 is a partial vertical sectional view of FIG. 10, and FIG. 12 is a partial vertical sectional view of a conventional T-shaped connection portion of the pond. (1)...metal fitting, (2)...bottomed cylindrical body, (2°,
2°°)...Circular hole, (3)...Open end, (4)...
...Receptacle mold, (4', 4°°) ... Notch groove, (5)
...Press mold, (6,6°, 6", 6°°°)...Brazil welding, (P)...Piping, (Po)...Communicating pipe Patent applicant Usui Kokusai Sangyo Co., Ltd. Figure Figure Figure Figure Figure

Claims (4)

[Claims] (1) A bottomed cylindrical body (2
), the metal fitting (1
), the pipes (P_1, P_2, . . . ) are set through the circular holes so that the ends of the pipes are spaced apart from each other, and in this state, a press mold is provided opposite to the receiving mold. (5
) from the periphery of the open end of the cylindrical body (2), the circular holes (2', 2'',...) are connected to the piping (P_
1, P_2, . A method for connecting small diameter metal tubes, characterized in that the metal tubes are connected by fitting and welding them together (6, 6', 6'', . . . ). (2) A method for connecting small-diameter metal tubes according to claim 1, characterized in that the circumferential surface of the open end is also subjected to a drawing process by applying pressure from the circumferential edge of the open end. (3) In claim 1, the pipes having different diameters (P,
A method for connecting small diameter metal tubes, characterized in that P_2,...) are connected. (4) A method for connecting small diameter metal pipes according to claim 1, characterized in that the pipes (P_1, P_2, . . . ) are connected eccentrically in the axial direction of the metal fitting (1).