JPS60223613A - Connecting method of copper and copper alloy tube - Google Patents

Abstract

PURPOSE:To improve workability and to solidify a joining by piercing a through hole at the branching part of a main pipe and by welding a flange body projecting outside by a certain width with forming work on a subordinate pipe and with contact thereto in the condition to cover the peripheral face of the through hole. CONSTITUTION:A through hole 5 is pierced on a main pipe 1' and the diameter thereof is taken as equivalent to or slightly smaller than the inner hole diameter of a subordinate pipe 2'. The end edge part of the pipe 2' is widen out at a certain angle and inserted into female die having a curvature of the same diameter with the main pipe 1' to be joined and a flange body 10 having a certain curvature is formed with the press work. A silver solder 11 is attached in an annular shape on the peripheral face of the upper part of the through hole 5 on the main pipe 1' and the joining by welding is performed with covering by the flange body 10 and heating from the upper side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for connecting copper and copper alloy tubes (hereinafter simply referred to as tubes).

Today, copper and copper alloys are widely used for piping applications such as hot water lines because of their excellent corrosion resistance, acid resistance, and thermal conductivity. As shown in Fig. 1, this is done through a pre-cast connecting pipe 3, which requires the troublesome work of welding and connecting each joint at the joint surface, resulting in very poor work performance. It is.

The present invention is an attempt to solve and eliminate the above-mentioned problems, and its feature is that a through hole with the same diameter or smaller than that of the auxiliary pipe is bored at the branch point of the main pipe, and the auxiliary pipe is In addition to locally heating a certain length of the end of the pipe and using a mold to form a flange that extends outward by a certain width, we also create a curved surface that matches the circumferential surface of the hole in the main pipe. The object is to form the hole so that it comes into contact with the circumferential surface of the hole so as to cover it, so that welding and joining can be performed.

Hereinafter, an example of implementing the present invention will be described based on the attached drawings.

FIG. 2 shows a 1° main pipe used in the method of the present invention, with through holes 5, 5, . . . being bored at appropriate locations in the pipe 1'. In this case, the through hole 5.5... must not be drilled at a necessary location for attaching the secondary pipe described below, and the diameter d of the through hole must be equal to or slightly smaller than the inner hole diameter of the secondary pipe. It will be done.

Figures 3A and 3B show the state in which a flange is formed on the end of the auxiliary pipe 2'' used in the present invention. 6 is a female mold, which is configured as a split mold, and is used for the pipe. 2' end edge p is female type 6
The part is heated (approximately 900°C) for a certain period of time while protruding a certain length from the surface.

Reference numeral 7 is a male type, and a tapered protrusion 7a is formed in the center of the front surface, which serves as a pressing surface, to gradually expand the end of the pipe during the process of insertion into the pipe 2', and also to define the terminal end. A periphery 7b is formed for this purpose.

As a result of the above, the end edge of the tube 2'' is first expanded into a diverging body p° at a certain angle (approximately 60°), and then as shown in Fig. 4A.
As shown in 1B, the diverging body p° is further connected to the main pipe 1 to be joined.
It is inserted into a female die 8 which has the same diameter of curvature as .°, and is pressed from above with a male die 1) having the same curvature. At this time, the female mold 8 is constituted by a split metal mold, and a hole n into which the main body of the tube 2 is inserted is bored at its mating location.

FIG. 5 is a perspective view of the auxiliary pipe 21 having the collar body 10 of a constant curvature manufactured in this manner.

FIGS. 6A and 6E show the joined state of the main pipe 1" and the sub pipe 2", in which silver solder 11 is attached in a ring shape to the upper circumferential surface of the through hole 5 in the main pipe 1". , because it is covered with the flange body 10 having the above structure and is welded and joined by heating from above. Alternatively, the joint surface between the peripheral edge of the flange body 10 and the main pipe 1 is joined together by TIG welding using an ordinary tungsten rod.

In addition to the above embodiments, in the present invention, the collar body 1 in the sub pipe 21
In the process of forming 0, that is, when the diverging body p' shown in FIG. 4th after letting
When the curvature processing according to Figure 0 is performed, the inner surface of the flange body 10 of the sub-pipe 21 is created with a ring-shaped silver solder 11 embedded therein. FIG. 7 shows a pipe 21 manufactured in this manner, in which the welding work can be accomplished by simply placing the pipe directly over the 1° through-hole 5 of the main pipe and simply heating it. It becomes something.

According to the method of the present invention, the welding work is simplified compared to the conventional method, so the work performance is dramatically improved, and since the joint is made more firmly, the strength is also improved. It becomes excellent.

[Brief explanation of drawings]

Fig. 1 shows the conventional connection method, Fig. 2 is a perspective view of the main pipe used in the present invention, and Fig. 3 A and B show the sub pipe used in the present invention using a mold. Figures 4A and 4B show the state in which the collar body is shaped to have a certain curvature, and Figure 5 shows the auxiliary pipe manufactured in this way. The perspective view of FIGS. 6A and 6B shows a state in which the main pipe and the sub-pipe are joined, and FIG. 7 is a perspective view of the sub-pipe according to another embodiment. 1, ■“...Main pipe 2.2゛...Sub-pipe 3...Connecting pipe 5...Through hole 6...Female type 7...Male type 7a...Tapered protrusion Japanese...・Periphery 8...Female type
9...Male mold 10...Flame body 11...Silver solder Fig. 1 (Japanese Patent Application Laid-Open No. 2003-223613CB) Fig. 3 Fig. 4 Fig. 5 Fig. 7

Claims (1)

[Claims] (1) A through hole with a diameter equal to or smaller than the inner diameter of the secondary pipe is drilled at the branch point of the main pipe, and the secondary pipe is heated outwardly using a mold while locally heating a certain length of the pipe end. In addition to shaping the flange body that extends over a certain width, it is also formed into a curved surface that matches the circumferential surface of the through-hole of the main pipe, and contacts the circumferential surface of the through-hole in a state that covers it.
A method for connecting copper and copper alloy pipes, characterized by causing a welded joint to occur.