JPH0533887A - Assembling method for flanged pipe and assembling structure thereof - Google Patents

Abstract

PURPOSE:To use a flange in common to various diameter pipes by spreading a pipe end part, inserting a spread pipe part into a mounting hole of the flange, holding a tilt stepped part in a spread pipe part base end interposed between a core metal and a pressing metal and applying curling work to a spread pipe end part so as to fix it by calking to a mounting hole edge of the flange. CONSTITUTION:A point end part of a pipe 11 is spread so as to be matched with a diameter of a mounting hole 13 of a flange 12, and a spread pipe part 11a connected to a pipe main unit 11b by a tilt stepped part 11c is formed. This spread pipe part 11a is fitted into the mounting hole 13 of the flange 12 to fix the tilt stepped part 11c interposed by a core metal 14 and a pressing metal 15. An end part of the spread fitting part 11c is curled by a curling metal fixture 16, and next by a calking metal fixture 19, a curled pipe end part is fitted to a fitting groove 18 and also calked.

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 flanged pipe and its assembling structure.

[0002]

2. Description of the Related Art As a method of assembling a flanged pipe and an assembling structure used in various conventional pipes, the one shown in FIG. 6 is widely used. That is, first, a pipe 1 having a constant diameter with no difference in the entire length is gripped by a core metal 2 and a press metal 3 at a portion separated from the tip by a predetermined distance, and the tip of the pipe 1 is inserted into a mounting hole 5 of a flange 4. The tip of the pipe 1 is curled. Then pipe 1
Insert the curling part 6 at the tip of the into the fitting groove 7 at the hole edge of the mounting hole 5 of the flange 4, and use the caulking metal fitting 8 to curl the part 6.
The flange 4 is fixed to the pipe 1 by caulking the flange 4 and the flange 4. In FIG. 6, 9 is a bolt hole.

[0003]

However, the above-described conventional method and structure for assembling a flanged pipe are curling in a state in which the core 1 and the presser 3 grip a portion of the pipe 1 which is not in any way engaged. Since the work is performed and the caulking process is performed, the action force applied to the pipe 1 during the curling process and the caulking process causes a slip between the core metal 2 and the press metal 3 and the pipe 1 to cause the core metal 2. In addition, the pipe 1 may not be sufficiently gripped by the pressing metal 3. Such slippage may occur even if the grip force of the pipe 1 by the core metal 2 and the press metal 3 is considerably increased. If slippage occurs between the core metal 2 and the press metal 3 and the pipe 1, there is a problem in that the predetermined curling process and the caulking process are not sufficiently performed and the process becomes incomplete.
Further, although the core metal 2 having a diameter 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 metal 3 so that the core metal 2 becomes difficult to remove from the pipe 1. There are also problems.

In view of the above circumstances, the present invention is capable of sufficiently gripping and fixing a pipe with a small grip force,
Further, it is an object of the present invention to provide a method of assembling a flanged pipe and an assembling structure thereof that can exhibit the effect of commonly using a flange even if the desired pipe diameter is various.

[0005]

The present invention has been made to achieve the above object. In claim 1, the end of the pipe is expanded to a diameter larger than the pipe body, and the expansion is flanged. Inserted in the mounting hole of the pipe, the stepped part of the boundary between the pipe body and the expanded part of the pipe end is held by the cored bar inserted inside the pipe and the presser applied from outside the pipe, and the curling metal fitting is used to hold the pipe. A method of assembling a flanged pipe is characterized in that the tip is curled, and the curling portion at the end of the pipe and the hole edge of the mounting hole of the flange are caulked by caulking metal fittings. According to claim 2, a pipe having a pipe expanding portion having a diameter larger than that of the pipe main body at a tip, and a core metal and a pusher for gripping a step formed at a boundary between the pipe main body and the pipe expanding portion at the pipe tip from inside and outside the pipe. A curling metal fitting for curling the pipe tip, a flange having a mounting hole into which the pipe tip is fitted and fixed between other members, and a curling portion at the pipe tip and a mounting hole for the flange. It is characterized by an assembling structure of a pipe with a flange, which comprises a caulking metal member for caulking the hole edges.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method of assembling a flanged pipe and an assembling structure according to the present invention will be described below with reference to the drawings. In FIG. 1, 11 is a pipe. Pipe 11
Needless to say, the one having the optimum diameter is used for various pipes. Flange 1 to which the tip side of pipe 11 should be attached
Pipe expansion is performed so as to match the hole diameter of the second mounting hole 13.
Therefore, the inclined stepped portion 11c is formed at the boundary between the pipe expanding portion 11a at the front end of the pipe 11 and the pipe body 11b. Then, as shown in FIG. 2, the cored bar 14 is inserted into the pipe from the tip of the pipe 11, and the cored bar 14 is applied from the inside of the pipe to the inner surface of the inclined step portion 11c. 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 the outside of the pipe, the press metal 15 is applied to the outer surface of the inclined step portion 11c. The presser plate 15 is divided into two equal parts, one presser plate 15a is brought into contact with a half peripheral part of the outer surface of the inclined stepped part 11c, and the other presser plate 15b is brought into contact with another half peripheral part of the outer surface of the inclined stepped part 11c. is there. The pressing surface of the presser foot 15 is an inclined step portion 11c.
Has the same shape as the outer surface. Then, the pressing metal 15 is pressed in the direction of the core metal 14, and the pressing metal 15 and the core metal 14 clamp the inclined stepped portion 11c of the pipe 11, so that the pipe 11
To grip. In the state where the inclined step portion 11c of the pipe 11 is gripped by the core metal 14 and the press metal 15 as described above, the tip of the pipe 11 is curled by the curling metal fitting 16, and the curling is folded back to the outer peripheral side in an arc shape. The part 17 is formed. When the curling process is performed by the curling metal fitting 16, a processing pressure is applied in the longitudinal direction of the pipe 11. However, since the pipe 11 has the inclined step portion 11c as described above, the inclined step portion 11c prevents the core metal 14 and the pressing metal. 15
Therefore, even if the processing pressure is applied, the careless slippage between the pipe 11 and the core metal 14 and the press metal 15 does not occur. Next, the mounting hole 13 of the flange 12 is fitted into the pipe 11. Flange 12
A ring-shaped fitting groove 18 is formed in the peripheral edge of the mounting hole 13 in advance, and the curling 1 is formed in the fitting groove 18.
Insert 7. Further, as shown in FIG. 3, the inclined stepped portion 11c of the pipe 11 is gripped by the core metal 14 and the press metal 15 as described above, and in this gripped state, the caulking metal fitting 19 is provided between the flange 12 and the curling portion 17. Caulking is performed so that the flange 12 and the pipe 11 are fixed so as not to fall off. Although the processing pressure at the time of this caulking is applied in the longitudinal direction of the pipe 11, the core metal 14 and the press metal 15 are
Since the inclined step portion 11c of No. 1 is gripped and there is an engaging force between the inclined step portion 11c and the core metal 14 and the pressing metal 15 in addition to the gripping force, the core metal 14 and the pressing metal 15 are also caused by the processing pressure. On the other hand, the pipe 11 does not slip carelessly. The pipe 11 may be inserted into the mounting hole 13 of the flange 12 either before or after curling.

As shown in FIG. 2, the pressing metal 15 is movable by a hydraulic cylinder 20, and the other core metal 14, curling metal fitting 16 and caulking metal fitting 19 are also movable by the hydraulic cylinder. It can also be driven by a power source.

As the pipe, in addition to the single pipe type of the above embodiment, a double pipe shown in FIG. 4 may be used. Inner tube 21
And the end portion of the outer tube 22 is expanded so as to match the hole diameter of the mounting hole 13 of the flange 12, and at this time, the expanded portion 23
Presses the inner tube 21 and the outer tube 22 against each other. The inner pipe 21 and the outer pipe 22 other than the expanding portion 23 have predetermined diameters. Therefore, an inclined step portion 25 is formed at the boundary portion between the main body portion 24 of the inner tube 21 and the outer tube 22 and the expanded tube portion 23, and the inclined step portion 25 is connected to the core metal 26 and the pusher 27.
Grip with and. 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. In addition, presser 2
The holding surface of 7 has the same shape as the outer surface of the outer tube 22 of the inclined step portion 25. Thereafter, the tip of the pipe (the inner pipe 21 and the outer pipe 22) is curled and caulked in the same manner as described above while the inclined step portion 25 is gripped by the core metal 26 and the press metal 27. Also in this case, in addition to the gripping force between the core metal 26 and the press metal 27, the engaging force between the inclined step portion 25 and the core metal 26 and the press metal 27 causes the inner pipe 21 and the outer pipe 22 to be processed by the processing pressure generated during the above processing. Does not cause a problem such as slipping carelessly with respect to the core metal 26 and the press metal 27.

The double tube type shown in FIG. 5 can also be adopted. That is, the outer diameter of the front portion 30 of the double pipe is formed so as to match 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 front portion 30. If the outer tube 33 has a diameter approximately the same as that of the tip portion 30, the inner tube 32 is formed with the inclined step portion 34 having the same shape as in FIG. The V-shaped recess is formed so that it can be engaged with the pusher 36. Therefore,
The cored bar 35 holds down the inclined step portion 34 of the inner pipe 32, while the outer pipe 3
If the double pipe is gripped by pressing the V-shaped stepped portion 37 (hereinafter referred to as an inclined stepped portion) 3 of 3 with the pusher 36, the inclined stepped portion 3 can be used during the curling process and the caulking process as described above.
4, 37 and the core metal 35 and the press metal 36 engage with each other,
There is no problem that the double pipe is inadvertently slipped on the core metal 35 and the pressing metal 36 due to the processing pressure.

The peripheral surface of the core metal 35 is an inclined step portion of the inner pipe 32.
It is formed in the same shape as 34, and the pressing surface of the presser foot 36 is
It is formed in the same shape as the outer surface of the inclined step portion 37 of the outer tube 33.

[0011]

As described above, according to the method of assembling the flanged pipe and the assembling structure thereof according to the present invention, since the inclined step portion is gripped, in addition to the grip force, the metal fitting and the inclined step portion to be gripped are provided. Since there is no need to inadvertently slip between the gripping metal fitting and the pipe due to the processing pressure during curling or caulking, the grip force on the pipe is also small, and the pipe Since the gripping and fixing are performed securely, the caulking process can be performed reliably, and a large caulking fastening force can be obtained. Furthermore, since the pipe tip is expanded to match the diameter of the mounting hole of the flange, it is convenient to use the flange in common for pipes of various diameters, and since the pipe tip is expanded, this diameter The rigidity can be improved by increasing

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a state in which a pipe tip is 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 essential parts showing a state in which an inclined step portion of the pipe of FIG. 1 is gripped by a core metal and a press metal and curling is performed by a curling metal fitting.

FIG. 3 is a cross-sectional view of essential parts showing a state in which an inclined step portion of the pipe in FIG. 2 is gripped by a core metal and a press metal and is caulked by caulking metal fittings.

FIG. 4 is a cross-sectional view of essential parts showing a state in which a cored bar and a presser plate are gripped in the case of a double pipe.

FIG. 5 is a sectional view of an essential part showing a modified example of another double pipe in a gripping state.

FIG. 6 is a sectional view of an essential part showing a conventional grip system of a pipe.

[Explanation of symbols]

11 pipes 11a, 23 Expansion section 11c, 25, 29 Inclined step 12 flange 13 mounting holes 14, 26, 35 core metal 15, 27, 36 push 16 Curling hardware 17 Curling part 18 Fitting groove 19 caulking metal fittings 21, 32 inner tube 22, 33 outer tube 37 steps (tilt steps)

Continued front page    (72) Inventor Shun Hayashi             523 Kagi, Asa-cho, Asakita-ku, Hiroshima-shi, Hiroshima             -3 Miwauchi Co., Ltd. (72) Inventor Teruo Egami             523 Kagi, Asa-cho, Asakita-ku, Hiroshima-shi, Hiroshima             -3 Miwauchi Co., Ltd.

Claims (2)

[Claims] 1. The pipe end is expanded to a diameter larger than that of the pipe body, and the expansion part is inserted into a mounting hole of a flange so that a step part of a boundary between the pipe body and the expansion part of the pipe end is formed. Hold the pinched state with a cored bar inserted in the pipe and a presser applied from the outside of the pipe, curling the pipe tip with a curling metal fitting, and caulking the curling part of the pipe end and the edge of the flange mounting hole. A method for assembling a flanged pipe, characterized by being crimped with a metal fitting. 2. A pipe having a pipe expanding portion having a diameter larger than that of the pipe main body at a tip thereof, and a core metal and a pusher for gripping a step portion formed at a boundary between the pipe main body and the pipe expanding portion at the pipe tip from inside and outside the pipe. A curling metal fitting for curling the pipe tip, a flange having a mounting hole into which the pipe tip is fitted and fixed between other members, and a curling portion at the pipe tip and a mounting hole for the flange. A structure for assembling a flanged pipe, comprising a caulking metal member for caulking between the hole edges of the.