JP2964104B2 - Assembling method of flanged pipe and its assembling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a pipe with a flange and an assembling structure thereof.

[0002]

2. Description of the Related Art As an assembling method and an assembling structure of a conventional flanged pipe used for various types of piping, the one shown in FIG. 6 is widely used. That is, first, a pipe 1 having a constant diameter without a step in its entire length is gripped by a cored bar 2 and a pusher 3 at a portion separated from the tip by a predetermined distance, and the tip of the pipe 1 is inserted into the mounting hole 5 of the flange 4. Then, the tip of the pipe 1 is subjected to curling. Then, pipe 1
Is inserted into the fitting groove 7 at the hole edge of the mounting hole 5 of the flange 4, and the curling portion 6 is
And the flange 4 are caulked to fix the flange 4 to the pipe 1. In FIG. 6, reference numeral 9 denotes a bolt hole.

[0003]

However, according to the above-mentioned conventional method for assembling a pipe with a flange and an assembling structure, curling is performed in a state where a portion of the pipe 1 having no engagement is gripped by the core 2 and the presser 3. Since the working and the caulking are performed, a sliding force occurs between the pipe 1 and the core 2 and the presser 3 due to the acting force applied to the pipe 1 during the curling and the caulking, and the metal 2 In addition, the gripping of the pipe 1 by the pusher 3 may not be performed sufficiently. Such a slip may occur even if the gripping force of the pipe 1 by the metal core 2 and the presser 3 is considerably increased. If slippage occurs between the cored bar 2 and the presser 3 and the pipe 1, there is a problem that predetermined curling and caulking are not performed sufficiently, resulting in an incomplete product.
Furthermore, although the core 2 slightly smaller than the pipe diameter is inserted into the pipe 1, the inner diameter of the pipe 1 is slightly reduced by the action of the pusher 3, and the core 2 is difficult to remove from the pipe 1. There are also problems.

[0004] In view of the above circumstances, the present invention can sufficiently grip and fix a pipe with a small gripping force.
Further, an object of the present invention is to provide a method of assembling a pipe with a flange and an assembling structure thereof, which can exert an effect such that a flange can be commonly used even if a desired pipe diameter is various.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. In the first aspect, the end of the pipe is expanded to a diameter larger than that of the pipe body, and the expanded portion is flanged. Of the pipe body and the expanded portion at the end of the pipe, and hold the pinching state between the core inserted into the pipe and the pusher applied from outside the pipe. A method of assembling a pipe with a flange, wherein a tip is curled, and a curling portion at the end of the pipe and an edge of a mounting hole of a flange are caulked with a metal fitting. According to the second aspect, a pipe having a pipe expansion portion larger in diameter than the pipe main body at the end, and a metal core and a presser for gripping a step formed at the boundary between the pipe main body and the pipe expansion portion at the pipe end from inside and outside the pipe. A curling fitting for curling the pipe tip, a flange having a mounting hole into which the pipe tip is fitted and being fixed between other members, and a curling portion at the pipe tip and a mounting hole for the flange. And a crimping fitting for caulking between the hole edges.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for assembling a pipe with a flange and an assembling structure according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 denotes a pipe. Pipe 11
It is needless to say that the most suitable diameter is used for various types of piping. Flange 1 to which the tip of pipe 11 should be attached
The pipe is expanded to match the diameter of the second mounting hole 13.
Therefore, an inclined step portion 11c is formed at the boundary between the expanded portion 11a at the front end of the pipe 11 and the pipe body 11b. Next, as shown in FIG. 2, the core metal 14 is inserted into the pipe from the tip of the pipe 11, and the core metal 14 is applied to the inner surface of the inclined step portion 11c from within the pipe. The peripheral surface of the cored bar 14 is formed in the same shape as the inner peripheral surface of the inclined step portion 11c. On the other hand, from outside the tube, the presser 15 is applied to the outer surface of the inclined step portion 11c. The pressing member 15 is divided into two equal parts, and one pressing member 15a is applied to a half of the outer surface of the inclined step portion 11c, and the other pressing member 15b is applied to the other half of the outer surface of the inclined step portion 11c. is there. The pressing surface of the presser 15 is an inclined step 11c.
The shape is the same as the outer surface of. Then, the presser 15 is pressed in the direction of the core 14, and the presser 15 and the core 14 clamp the inclined step portion 11 c of the pipe 11, and
To grip. While the inclined step 11c of the pipe 11 is gripped by the cored bar 14 and the pusher 15 as described above, the tip of the pipe 11 is subjected to curling by a curling bracket 16, and the curling is returned to the outer peripheral side in an arc shape. The part 17 is formed. When the curling process is performed by the curling fitting 16, a working pressure is applied in the longitudinal direction of the pipe 11, but since the pipe 11 has the inclined step 11c as described above, the inclined step 11c is Fifteen
, And the processing pressure does not cause inadvertent slippage between the pipe 11 and the metal core 14 and the presser 15. Next, the fitting hole 13 of the flange 12 is fitted into the pipe 11. Flange 12
A ring-shaped fitting groove 18 is formed in advance on the periphery of the mounting hole 13.
7 is inserted. Further, as shown in FIG. 3, the inclined step portion 11c of the pipe 11 is gripped by the cored bar 14 and the presser 15 as described above, and in this gripped state, the caulking fitting 19 is used to interpose the flange 12 and the curling portion 17 between each other. By caulking, the flange 12 and the pipe 11 are fixed so as not to fall off. The working pressure at the time of this caulking is applied in the longitudinal direction of the pipe 11.
Since the inclined step 11c is gripped and the engaging force of the inclined step 11c, the core 14 and the pusher 15 exists in addition to the grip force, the core 14 and the pusher 15 are also produced by the above processing pressure. The pipe 11 does not slip inadvertently. The timing of inserting the pipe 11 into the mounting hole 13 of the flange 12 can be before or after the curling process.

The presser 15 is moved by a hydraulic cylinder 20 as shown in FIG. 2, and the other metal core 14, the curling metal 16 and the caulking metal 19 are also moved by a hydraulic cylinder. It is also possible to drive with a power source.

As the pipe, a double pipe shown in FIG. 4 may be used in addition to the single pipe of the above embodiment. Inner tube 21
And expanding the end of the outer tube 22 so as to match the diameter of the mounting hole 13 of the flange 12.
Presses the inner tube 21 and the outer tube 22 together. The inner pipe 21 and the outer pipe 22 other than the expanded section 23 have a predetermined diameter. Accordingly, an inclined step 25 is formed at the boundary between the main body 24 of the inner pipe 21 and the outer pipe 22 and the expanded pipe 23, and the inclined step 25 is formed by the core metal 26 and the presser 27.
And grip with. The peripheral surface of the cored bar 26 has the same shape as the inner surface of the inner tube 21 of the inclined step portion 25. Also, presser 2
7 has the same shape as the outer surface of the outer tube 22 of the inclined step portion 25. Thereafter, the ends of the pipes (the inner tube 21 and the outer tube 22) are curled in the same manner as described above while the inclined step 25 is gripped by the metal core 26 and the presser 27, and further caulked. In this case as well, in addition to the gripping force of the core metal 26 and the presser 27, the inner pipe 21 and the outer pipe 22 are formed by the processing pressure generated at the time of the above-described processing by the engagement force between the inclined step portion 25 and the core 26 and the presser 27. Does not occur inadvertently sliding with respect to the metal core 26 and the presser 27.

A double tube type shown in FIG. 5 can also be adopted. That is, the outer diameter of the tip portion 30 of the double pipe is formed so as to correspond to the hole diameter of the mounting hole 13 of the flange 12, and in the main body 31 of the double pipe, the inner pipe 32 has a smaller diameter than the tip portion 30. When the outer tube 33 has a diameter substantially the same as that of the tip portion 30, the inner tube 32 is formed with an inclined step 34 having the same shape as that shown in FIG. In this case, a recess is formed in a V-shape so as to be able to engage with the pusher 36. Therefore,
The core metal 35 holds down the inclined step 34 of the inner tube 32, while the outer tube 3
3 by pressing the V-shaped step 37 (hereinafter referred to as the inclined step) with the pusher 36 and gripping the double pipe, the curving and caulking processing as described above allows the inclined step 3 to be formed.
4 and 37 are engaged with the metal core 35 and the pusher 36, respectively.
The trouble that the double pipe slides carelessly with respect to the core 35 and the presser 36 due to the processing pressure does not occur.

The peripheral surface of the cored bar 35 is a stepped portion of the inner tube 32.
It is formed in the same shape as 34, and the pressing surface of the presser 36 is
The outer tube 33 is formed in the same shape as the outer surface of the inclined step portion 37.

[0011]

As described above, according to the method for assembling a pipe with a flange and the structure for assembling the same according to the present invention, the inclined stepped portion is gripped. Engages with each other, so that there is no inadvertent sliding between the gripping metal and the pipe due to the processing pressure during curling or caulking, and the gripping force on the pipe is also small, and the pipe is Since it is securely gripped and fixed, caulking can be performed reliably, and a large caulking fastening force can be obtained. Furthermore, since the pipe tip is expanded so as to match the diameter of the mounting hole of the flange, the flange can be used in common for pipes of various diameters, which is very convenient. The rigidity can also be improved by the expansion of.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a state in which a pipe end is first expanded to form an inclined step portion in a pipe used for an assembling method and an assembling structure of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state where the inclined step portion of the pipe of FIG. 1 is gripped by a cored bar and a presser, and curling is performed by a curling bracket.

FIG. 3 is a cross-sectional view of a main part showing a state in which an inclined step portion of the pipe of FIG. 2 is gripped with a metal core and a presser and subjected to caulking with a caulking fitting.

FIG. 4 is a cross-sectional view of a main part showing a state in which a double pipe is gripped by a metal core and a presser.

FIG. 5 is a cross-sectional view of a main part showing a modified example of another gripping state of a double pipe.

FIG. 6 is a sectional view of a main part showing a conventional pipe gripping method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pipe 11a, 23 Expansion part 11c, 25, 29 Inclined step part 12 Flange 13 Mounting hole 14, 26, 35 Core metal 15, 27, 36 Depressed metal 16 Curling metal 17 Curling part 18 Fitting groove 19 Caulking metal 21, 32 Inner pipe 22, 33 outer tube 37 step (inclined step)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Teruo Egami 523-3 Ogi, Asa-cho, Hiroshima-shi, Hiroshima Prefecture Miwanai Co., Ltd. (56) References JP-A-60-40623 (JP, A JP-A-1-105088 (JP, A) JP-A-2-37217 (JP, U) JP-A-60-8229 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16L 23/026 B21D 39/02 F16L 23/024 F16L 23/028

Claims (2)

(57) [Claims] 1. An end portion of a pipe is expanded to a diameter larger than that of a pipe main body, and the expanded portion is inserted into a mounting hole of a flange to form a step at a boundary between the pipe main body and an expanded portion of the pipe end. The pressed state is maintained by the core bar inserted into the pipe and the pusher applied from the outside of the pipe, the tip of the pipe is curled with a curling fitting, and the curled portion of the pipe end and the edge of the mounting hole of the flange are caulked. A method for assembling a pipe with a flange, characterized by being caulked with metal fittings. 2. A pipe having an expanded portion at a tip thereof having a diameter larger than that of a pipe body, and a core bar and a presser for gripping a step formed at a boundary between the pipe body and the expanded portion at the tip of the pipe from inside and outside the pipe. A curling fitting for curling the pipe tip, a flange having a mounting hole into which the pipe tip is fitted and being fixed between other members, and a curling portion at the pipe tip and a mounting hole for the flange. And a caulking fitting for caulking between the hole edges of the pipe.