JPH078947Y2 - Flanged pipe connection structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for a pipe having a curled end and a flanged pipe having a flange joined thereto, and more particularly to a flanged pipe joining structure having concavities and convexities formed on a joining surface.

[0002]

2. Description of the Related Art Conventionally, as a pipe with a flange, in which a pipe end is expanded and curled, and a flange is joined, FIG.
There is something like. In FIG. 8, a flanged pipe F is integrally formed by caulking a pipe 11 whose end portion is curled to have a J-shaped cross section and a flange 12 having a U-shaped fitting groove 12a formed on the inner diameter side. It has been engaged. On the outer peripheral side concentric circle of the flange 12,
Bolt hole 12 for inserting a set bolt (not shown)
c is perforated.

[0003]

In the case of a flanged pipe as shown in FIG. 8, whether the axial and circumferential coupling forces of the pipe are insufficient, and whether the caulking process is sufficient. There was a problem that it could not be judged by the appearance.

The present invention has been made in view of the above points, and a flanged pipe in which the coupling force in the axial direction and the circumferential direction of the pipe is made firm and the degree of caulking can be judged from the appearance. The purpose is to provide a binding structure of.

[0005]

In order to achieve the above-mentioned object, in the present invention, in a pipe with a flange in which a pipe whose end is expanded and curled and a flange are caulked and joined, unevenness is formed in an inner tapered portion of the pipe. In addition to forming the pattern, a concavo-convex pattern was formed on the lower outer side of the fitting groove of the flange to form a flanged pipe joint structure.

Further, in a flanged pipe in which a pipe whose end is expanded and curled, and a flange are joined, a metal plate is formed by press working or the like so that the peripheral edge of the pipe insertion port is raised to form a fitting groove and an annular edge. A flanged pipe coupling structure was formed by tapering the opening end so as to widen it and forming a tapered portion on the outer side below the fitting groove, which has a taper similar to the opening taper.

Further, a flanged pipe coupling structure is formed by radially forming the concave-convex pattern on the inner tapered portion of the pipe and on the outer side under the fitting groove of the flange.

Still further, a flanged pipe coupling structure is provided in which the concavo-convex pattern of the inner tapered portion of the pipe is concentric.

[0009]

In the embodiment, the flanged pipe A has the following characteristics when the pipe 1 and the flange 2 are joined by caulking.
A radial or concentric circular concave-convex pattern engraved on the upper caulking die 3 is formed on the curl portion 1a of the pipe 1, and at the same time, the radial concave-convex pattern engraved on the lower caulking die 4 causes the fitting groove of the flange 2 to be fitted. A concavo-convex pattern is formed on the lower outer side of 2a, and the pipe 1 and the flange 2 are integrally connected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flanged pipe connecting structure according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a state before the pipe and the flange set in the upper and lower caulking type are joined together in the flanged pipe joining structure according to the present invention. FIG. 2 is a sectional view of the pipe before coupling, and FIG. 3 is a sectional view of the flange before coupling. Further, FIG. 4 is a cross-sectional view showing a state in which the flange and the pipe are caulked and coupled by an upper and lower caulking type.

In FIG. 1, the pipe 1 and the flange 2 are
The upper and lower caulking molds 3 and 4 are set. As shown in FIG. 2, the pipe 1 is a metal pipe in which a curl portion 1a is formed by curling the end portion in a J-shaped cross section. The flange 2 is formed by pressing a metal plate,
As shown in FIG. 3, the fitting groove 2a having a U-shaped cross section is formed on the inner diameter side by press working, and the outer peripheral portion is folded back inside and the outer edge portion 2b is formed by press working. A bolt hole 2c for inserting a set bolt (not shown) is formed in a concentric circle on the outer peripheral side of the flange 2. That is, the flange 2 is formed by pressing the metal plate to raise the pipe insertion port to form the fitting groove 2a and the annular inner edge 2d and forming the outer edge portion 2b.

The upper caulking die 3 is a curl portion 1a of the pipe 1.
An uneven pattern for molding unevenness is engraved radially or concentrically. Further, the lower caulking die 4 is provided with a concave-convex pattern radially formed on the lower outer side of the fitting groove 2a of the flange 2 for forming a concave-convex pattern. By such caulking, the entanglement at the joint between the pipe 1 and the flange 2 becomes large, and the caulking pressure at the taper portion increases,
The pipe 1 and the flange 2 are firmly connected.

The pipe 1 and the flange 2 set in the upper and lower caulking dies 3 and 4 are caulked as shown in FIG. 4, and the pipe 1 and the flange 2 are integrally connected. When the concavo-convex pattern of the curl portion of the upper caulking die 3 is radial, a radial concavo-convex pattern 1c as shown in FIG. 5 is formed on the inner tapered portion 1b of the curl portion 1a of the pipe 1. When the concavo-convex pattern of the curl portion of the upper caulking die 3 is concentric, a concentric concavo-convex pattern 1d as shown in FIG. 6 is formed on the inner tapered portion 1b of the pipe 1.

FIG. 7 is a bottom view of the flanged pipe A. In FIG. 7, a concavo-convex pattern 2d of the lower caulking die 4 is formed on the lower outer side of the fitting groove 2a of the flange 2.

As described above, in the embodiment, the flanged pipe A has a radial or concentric concave-convex pattern engraved on the upper caulking die 3 when the pipe 1 and the flange 2 are joined by caulking. Simultaneously with the molding of the curl portion 1a, the uneven pattern is formed on the lower outer side of the fitting groove 2a of the flange 2 by the radial uneven pattern engraved on the lower caulking die 4.

The present invention is not limited to the above-described embodiment, but in relation to the coupling strength, the uneven pattern of the inner tapered portion 1b of the pipe 1 and the lower outer side of the fitting groove 2a of the flange 2 are formed. The cross section of the uneven pattern or the lattice pattern is included in the technical idea of the present invention.

[0017]

As described above, in the coupling structure for a pipe with a flange according to the present invention, the concavo-convex pattern is formed on the inner tapered portion of the pipe, and the concavo-convex pattern is formed on the lower and outer sides of the fitting groove of the flange. Join the pipe and flange together.

That is, since the pipe curling end is subjected to a pressing force and a twist in the tapering portion of the flange in the diameter reducing direction, the caulking force (axial direction) is improved as compared with the conventional type. Further, since the tapered portion is provided with irregularities, the contact surface between the pipe and the flange in the tapered portion is increased, and the caulking engagement strength is improved. Further, when the unevenness is formed in a radial pattern, the effect of preventing the pipe from turning is great. With the circumferential irregularities, the push-pull coupling degree in the axial direction of the pipe becomes large. The sharpness of the concavo-convex pattern of the taper portion allows the pressure applied by the caulking device to be indirectly judged and confirmed, which has a remarkable effect of improving quality. Moreover, since the lower outer tapered portion of the fitting groove in the flange is provided with irregularities, the effect of preventing the pipe and the flange from rotating is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state before coupling, which is set in upper and lower caulking types in a coupling structure of a pipe with a flange according to the present invention.

FIG. 2 is a sectional view of a pipe in a flanged pipe coupling structure according to the present invention.

FIG. 3 is a sectional view of a flange in the flanged pipe joint structure according to the present invention.

FIG. 4 is a cross-sectional view of the combined state of FIG.

FIG. 5 is a cross-sectional view of a first embodiment of the coupling structure for flanged pipes according to the present invention.

FIG. 6 is a cross-sectional view of a second example of implementation of the flanged pipe joint structure according to the present invention.

FIG. 7 is a bottom view of the flanged pipe.

FIG. 8 is a cross-sectional view showing an example of a conventional flanged pipe coupling structure.

[Explanation of symbols]

 A Pipe with flange 1 Pipe 1a Curl portion 1b Inner taper portion 1c Radial uneven pattern 1d Concentric uneven pattern 2 Flange 2a Fitting groove 2b Outer edge 2c Bolt hole 2d Uneven pattern 3 Top caulking type 4 Bottom caulking type

Claims (4)

[Scope of utility model registration request] 1. In a flanged pipe in which a pipe having a diameter-increased curling end and a flange are caulked together, a concavo-convex pattern is formed on the inner tapered part of the pipe, and a concavo-convex pattern is formed on the lower and outer sides of the fitting groove of the flange. The joint structure of the pipe with a flange characterized by being molded. 2. A flanged pipe in which a pipe whose end is expanded and curled and a flange are joined together, wherein a metal plate is press-worked or the like to raise the pipe insertion port peripheral edge to form a fitting groove and an annular edge. A joint structure for a pipe with a flange, characterized in that it is formed in a tapered shape so as to widen the opening end, and has a tapered portion on the outer side below the fitting groove, which has an inclination similar to the opening taper. 3. The coupling structure for a pipe with a flange according to claim 1, wherein each of the concave-convex patterns on the inner tapered portion of the pipe and the outer side under the fitting groove of the flange is radially formed. 4. The coupling structure for a pipe with a flange according to claim 1, wherein the concavo-convex pattern of the inner tapered portion of the pipe is concentric.