JPS6147359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a branch pipe joint using a thin-walled pipe used, for example, in a push pipe system, fuel pipe, or oil supply pipe system in vehicles such as automobiles and construction machines.

As shown in FIGS. 1 to 8, conventional branch pipe joints connect a main pipe a with a branch hole _a to a pipe joint b.
is inserted into the position of the branch hole _a1 , and a branch pipe c is inserted into this pipe joint b and brazed with brazing material d. The manufacturing method for such a branch pipe joint is as shown in FIGS. 4A, B, and C. First, a branch hole a ₁ is drilled in the main pipe a with _a drill A. Insert the pipe joint b into the main pipe a that has been drilled from one side to the position of the branch pipe a ₁ , and then insert the branch pipe c into the opening b ₁ of the pipe joint b, and then Squeeze the opening b ₁ and the lower end b ₂ of the joint b with a tool B such as pliers, and remove the main pipe a.
and the branch pipe c are temporarily fixed, and furthermore, the joint surface e of the main pipe a and the pipe fitting b and the joint surface f of the pipe joint b and the branch pipe c are heated to a predetermined temperature by applying brazing material d. Heat and pour the brazing material d onto both the joint surfaces e and f,
This allows for sealing and bonding.

However, in the method for manufacturing the branch pipe joint described _above , as shown in FIG. This not only makes it difficult to secure a specified flow rate of fluid, but also makes it difficult to swage the end of pipe fitting b with tool B when crimping the pipe fitting b. As a result, uniform caulking is not performed over the entire joint surfaces e and f, and as a result, the brazing material d is not evenly applied to both the joint surfaces e and f, and pressure fluid Furthermore, since drill A is used when drilling branch hole _A1 in main pipe A, a process to remove chips (also called burrs) is required. They were forced to go through the troublesome work process.

Note that the chips generated when drilling the branch hole _A1 may be lost after piping due to vibrations from automobiles, etc., and flow out together with the pressure fluid, causing clogging of the caplet in the fuel piping system, for example. Become.

In order to solve the above-mentioned difficulties, the present invention inserts a pipe joint into the main pipe, then inserts a branch pipe into the opening of the pipe joint, and then inserts a punch member having a caulking part and a punch part. By driving into the branch pipe, a branch hole is drilled in the main pipe, and at the same time, the main pipe is pressed to flatten it slightly, and the upper end edge of the pipe joint is pressed by the caulking part to caulk it. Next, brazing material is poured into the joint surface of the pipe joint to seal the joint. This simplifies the manufacturing process, reduces leakage defects and clogging due to gaps, and improves quality. ,together,
The present invention provides a method for manufacturing a branch pipe joint whose purpose is to improve reliability.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

The branch pipe joint according to the present invention includes, for example, a main pipe 1 made of a thin-walled pipe used in a fuel piping system in a vehicle.
After inserting the pipe joint 2 into the pipe joint 2 and inserting the branch pipe 3 into the upper opening 2a of the pipe joint 2, the punch member 4 having the caulked part 4a and the punch part 4b is driven into the branch pipe 3. Then, a branch hole 5 is drilled and caulked, and then brazing material 8 is poured into the joint surfaces 6, 7 of the pipe joint 2.

That is, the method for manufacturing a branch pipe joint having the above-described configuration according to the present invention is performed in the following steps.

In FIGS. 5 to 8, reference numeral 1 denotes a main pipe made of a thin-walled pipe, and the main pipe 1 is connected to the above-mentioned pipe joint 2.
Insert. Next, the upper opening 2 of this pipe joint 2
Insert the branch pipe 3 into the branch pipe a, and then insert the punch member 4 having the caulking part 4a and the punch part 4b into the branch pipe 3.
Type in. Then, the punch portion 4b of the punch member 4 punches a branch hole 5 in the vertical direction in the main pipe 1 located inside the pipe joint 2, and at the same time, the main pipe 1 around the branch hole 5 is punched by the pressing force of the punching operation. As shown in FIG. 8, the caulked portion 4a closes the upper opening 2a of the pipe fitting 2 so that it is not visible from the outside. It is designed to be caulked.

In other words, the punch member 4 punches the branch hole 5 in the vertical direction with the punch portion 4b, and at the same time brings the outer circumferential surface of the main pipe 1 into close contact with the inner wall surface 2b of the pipe fitting 2, and also closes the upper opening 2a of the pipe fitting 2. It is designed to be fixed by caulking.

After pulling out the punch member 4 from the branch pipe 3, brazing material 8 is poured into the joint surface 6 between the pipe joint 2 and the main pipe 1 and the joint surface 7 between the pipe joint 2 and the branch pipe 3 to closely join them. This completes the process.

Therefore, the present invention can efficiently perform the drilling work of the branch hole 5 and the caulking work at two locations at once, and can greatly simplify the work process.

Next, the embodiment shown in FIG. 9 is another embodiment of the punch member 4, in which the punch member 4 is formed by dividing the caulked portion 4a by providing a slot. Upper opening 2a of the pipe fitting 2
It is designed so that it can be caulked, and has the same content as the above-mentioned specific example.

As described above, according to the present invention, the pipe fitting 2 is inserted into the main pipe 1, and then the opening 2 of the pipe fitting 2 is
By inserting the branch pipe 3 into the main pipe 1 and then driving the punch member 4 having a caulking part 4a and a punch part 4b into the branch pipe 3, the branch hole 5 is formed in the main pipe 1 with the punch part 4b. At the same time as drilling, the main pipe 1 is pressed to bring it into close contact with the inner wall surface 2b of the pipe joint 2, and the upper opening 2a of the pipe joint is pressed and caulked with the caulking part 4a. Since the brazing material 8 is poured into the joint surfaces 6 and 7 of the pipe joint 2 to form a hermetically sealed joint, there is no misalignment of the branch hole 5, which not only simplifies the manufacturing process but also enables uniform caulking. Therefore, it is possible to reduce leakage defects and clogging due to gaps, and to shorten the length l as the caulking margin of the pipe joint 2. Moreover, it has excellent effects such as eliminating the need for removing chips.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional branch pipe joint, Figure 2 is an enlarged cross-sectional view taken along chain line A-A in Figure 1, and Figure 3 is a
Explanatory diagram when deformed in Figure 4A,
B and C are diagrams for explaining a conventional method for manufacturing a branch pipe joint, FIG. 5 is a partially cutaway front view for explaining a method for manufacturing a branch pipe joint according to the present invention, and FIG. The figure is a front view of a branch pipe joint manufactured according to the present invention, Figure 7 is a diagram for explaining the manufacturing process of the present invention, and Figure 8 is an enlarged view taken along the chain line B-B in Figure 7. The sectional view, FIG. 9, is a perspective view of another punch member used in the present invention. 1... Main pipe, 2... Pipe joint, 3... Branch pipe, 4a
... Caulking part, 4b ... Punch part, 4 ... Punch member, 5 ... Branch hole, 6, 7 ... Joint surface, 8 ...
Low wood.

Claims (1)

[Claims] 1. Insert a pipe joint into the main pipe, then insert a branch pipe into the opening of the pipe joint, and then drive a punch member having a caulking part and a punch part into the branch pipe to close the main pipe. At the same time, the main pipe is pressed to make it slightly flattened and tightly adhered to the inner wall surface of the pipe joint, and the caulking portion is pressed against the upper opening of the pipe joint to swage it, Next, a method for manufacturing a branch pipe joint, characterized in that brazing material is poured into the joint surface of the pipe joint to seal the joint.