KR970009018B1 - Flange joint and connection method of pipe flange - Google Patents

Abstract

None.

Description

Flange seam, pipe flange and pipe to pipe flange coupling method

1 is a longitudinal sectional view of one embodiment of a flanged seam that best illustrates the features of the present invention;

FIG. 2 is a longitudinal sectional view showing a tube and a pipe flange used to manufacture the flanged seam shown in FIG. 1. FIG.

FIG. 3 is a longitudinal sectional view showing a final process of a method of manufacturing the flange joint of FIG. 1 using a tube and a pipe flange of FIG.

4 is a graph showing the relationship between the load and the displacement in the failure test of the flange joint of the present invention.

5 is a graph showing the relationship between the load and the displacement in the failure test of the metal tube with a flange for connection according to the invention in Japanese Patent Application Laid-Open No. 1-1050884.

6 is a graph showing the relationship between the load and the displacement of another example in the present invention.

7 is a graph showing the relationship between the load and the displacement of another example in the present invention.

8 is a longitudinal sectional view showing another embodiment of the flange joint of the present invention.

FIG. 9 is a longitudinal sectional view of a pipe and a pipe flange used for producing the flanged seam shown in FIG. 8. FIG.

Figure 10 is a longitudinal sectional view showing another embodiment of the flange joint of the present invention.

FIG. 11 is a longitudinal sectional view of a pipe and a pipe flange used for producing the flanged seam shown in FIG. 10; FIG.

Figure 12 is a longitudinal sectional view showing a more preferred embodiment of the tube flange of the present invention and a tube and a mold.

FIG. 13 is a longitudinal sectional view showing a process of manufacturing a flange seam using the pipe, the pipe flange and the mold shown in FIG.

FIG. 14 is a longitudinal sectional view showing the final process and the flanged seam and mold manufactured following FIG. 12, FIG.

Figure 15 is a longitudinal cross-sectional view showing the most excellent embodiment of the tube flange of the present invention and the tube and the mold.

FIG. 16 is a longitudinal sectional view showing a process of manufacturing a flange joint using the pipe, the pipe flange and the mold shown in FIG.

FIG. 17 is a longitudinal sectional view showing the final process and the flanged seams and molds made in FIG. 15, FIG.

* Explanation of symbols for main parts of the drawings

1 flange seam 2 flange face

3: music part 3 ': music part outside

4: wrinkle part 5: circular cut surface

6: pipe flange 6 ': sheet metal press pipe flange

7 end of pipe 7 ₁ : inner peripheral surface of pipe end 7

7 ₂ : outer peripheral surface of the tube end 7 8: tube

9: Conical surface 9 ': Gradually increasing conical surface of taper angle

9: curved surface with a curve in which the taper angle gradually increases

10: face along the plane 2 13: edge of the flange 6

14 ₁ : Inner cylindrical wall surface 14 ₂ : Outer cylindrical wall surface

14 ₃ : Short wall surface along the axis 15: Circular groove on the inside

16: outer circular groove

α, α ₁ , α ₂ , α ₃ , α _x . … : Flare type taper angle

The present invention relates to a flange joint and a structure of a pipe flange used to form the flange joint and a method of joining the pipe and the tube flange.

As a coupling method of a pipe and a pipe flange, coupling methods, such as screw thinning, butt-welding type | mold welding, or an embedding welding type, are used normally. In the case of a thin tube, a joining method such as an insert welding method or an insert soldering method is generally used. A thin tube and a slip-on type sheet metal press are used for weight reduction such as an automobile silencer muffler. A joining method such as an insert welding method or an insert soldering method using a first flange is used.

In addition, a collar having a first and a second flange part spaced apart from each other, as illustrated in JP-A-60-76231, is provided as a joint of a silencer device for a vehicle silencer. Guides the free end of the pipe, installs the first flange on the free end, polymerizes the free end, and passes the free end of the pipe and the collar formed in the plate member. And engaging the second flange portion with the back surface of the collar, deforming the collar by applying a force to the tube and extending the free end so that the deformed collar is fixed in the vicinity of the opened collar and the plate member opening. And plate member fixing method "is also known.

Furthermore, the inventors of the present application show that, in Japanese Unexamined Patent Application Publication No. 1-105088, "there has a through hole at the center, and forms an annular groove concentrically with the central through hole at the connection side, and annular between the annular groove and the central through hole. And a metal pipe having a wall-mounted connecting flange and an inverted part provided in the center through-hole of the connecting flange and inserted into and fitted at the end thereof with an inverted portion that is inverted to the outer circumferential side thereof. At the same time, the inverted portion of the metal tube is sandwiched between the inner and outer peripheral walls of the annular groove of the flange for connection. A flange formed between the annular groove and the central through hole, and formed by inserting and fitting into the central through hole of the connecting flange. At the end of the side surface, an inverted portion that is inverted in diameter is provided on the outer circumferential side, and the inverted portion is press-fitted into the annular groove of the connecting flange, and the annular wall of the connecting flange is bent to the outside to form an inner and outer circumferential wall in the annular groove. And a patent application to the Japanese Patent Office on April 19, 63, digestion.

The joining method by the various welding methods cannot work unless it is a welding technician, and there exists a fault which pollutes a working environment by the gas or fume which generate | occur | produce during a welding operation. In addition, the screw thinner requires a tube having an extra thickness because the sealing material or the screw is screwed in. In the butt welding method, the material tends to melt when welded, and the warping of the material due to heating is also large, and thus it cannot be used for thin tubes, flanges made of sheet metal presses, and the like. The embedded welding method and the embedded soldering method are poor in workability, and if the welding method, the soldering method, and the post-weld heat treatment are not appropriate, stable strength and beautiful finish or necessary corrosion resistance of the joint cannot be obtained. In addition, the welding method or the soldering work using the thin-walled pipe and the flange made of sheet metal press is more difficult and the workability is worse, and the work is performed by the gas or fume generated during the work. You can't eliminate the flaws that pollute the environment.

Partially exposed to high-temperature exhaust gases, such as the first muffler for automobile silencers, is made of electric resistance welded carbon steel pipes and molten aluminum-plated steel sheets or strips for automobile structures coated with molten aluminum plating having excellent oxidation resistance at high temperatures. The welding of flanges made of sheet metal presses is also used. This kind of surface-treated steel is not only more difficult to weld or solder, but also the plating is peeled off by welding, and above all, the oxidation resistance of the high exhaust gas temperature is lost. In addition, since aluminum is solid-dissolved in the weld metal, this part becomes hard and brittle and may cause cracks when subjected to repeated vibration, and a joining method other than welding is avoided.

In addition, as the fixing method of the pipe | tube and plate member illustrated in Unexamined-Japanese-Patent No. 60-76231, not only the pipe | tube which has the 1st and 2nd flange spaced apart from each other, but also the collar of a separate body is deformed. Since the collar is widened and fixed in the vicinity of the opening of the collar and the plate member, even if this fixing method is used when connecting the pipe and the flange made of sheet metal press, sufficient joint strength is not obtained. In the connection of the pipe, the joint between the pipe and the pipe flange is loosened, and thus complete airtightness cannot be guaranteed.

The manufacturing method of the connection flange metal pipe and the connection flange metal pipe shown in Japanese Patent Application Laid-Open No. 1-105088 is excellent in the strength and airtightness of the joint, but the metal pipe is installed inside the central through hole of the connection flange. In the end of the connecting flange side of the connection flange, an operation of providing an inverted part which is inverted in diameter to the outer circumferential side is necessary. For this reason, the only drawback was that a special jig or a complicated molding apparatus was required and the workability was not so good in forming the inverted portion.

The present invention solves the problems as described above in the prior art, flange joints excellent in bonding strength and airtightness that can be applied to various applications, pipe flanges and workability of rational formation used in these flange joints and good workability It is to obtain a flange joint that is excellent in heat resistance and oxidation resistance, which has a light weight, high mechanical strength, mass productivity, and a coupling method between a pipe and a pipe flange that do not impair the environment.

. The flange coefficient 1 of the present invention is formed in a flare shape toward the flange face 2 at the center portion, and has a corrugation portion having a curved portion 3 whose tip is bent inward and is bent outward again. 4) and a flange 6 having an annular cut face 5 from the flange face 2 enclosing the wrinkle part 4 and an end portion 7 sandwiched in the center of the wrinkle part 4. It is characterized by consisting of the expanded tube (8).

. As an embodiment of the flange coefficient 1, the flare may be formed by the conical surface 9 having a predetermined taper angle α.

. Incidentally, the taper angles α, α ₂ , α ₃ ,... You may form in the conical surface 9 'which has a.

. As another embodiment of the flange seam 1, the flared shape may be formed into the curved surface 9 along a curve in which the taper angle α continuously increases.

. As a further characteristic embodiment of the flange coefficient (1), the flare type includes the surfaces (9), (9 ') or (9) described in the above B to D, and the flange surface (2) following this; It is more preferable to form the parallel surface 10.

. Further, the flange joint 1 'having the flange 6' made of sheet metal press of the present invention is flared open toward the flange face 2, and the tip thereof is bent inward to form the curved portion 3. From the flange face 2 enclosing the part 4 and the corrugation part 4, it is bent along the annular cut face 5 in the opposite direction to the lap part 3 to form an outer circumferential part 3 ′. The outer corrugation portion 4 'extending to the flange surface 2 is disposed concentrically, and the center portion of the flange 6' made of sheet metal press and the corrugation portion 4 formed in a zigzag cross section of the center portion. The end 7 clamped to the constituted tube 8 is expanded To What is necessary is just to mention the flange joint mentioned above.

. In addition, To The structure of the pipe flange 6 used to form the flange seam 1 of the claim is the short cylindrical wall surface 14 ₁ , 14 ₂ arranged concentrically in the center and the end of the pipe 8 which is connected to them. A curved portion 3 and the above-mentioned short cylindrical wall surface 14 which form a dimension inner circular groove 15 which is interposed or interposed between the inner and outer circumferential surfaces 7 ₁ , 7 _{2 in} (7). ₁ , 14 ₂ , characterized in that it has an outer circumferential portion 3 ′ which is bent in the opposite direction with an outer circular groove 16 opening towards the flange face 2 enclosing ₁ , 14 ₂ .

. In addition, the pipe flange 6 used to form the flange seam 1 described in the above E is connected to a short cylindrical wall surface 14 ₁ , 14 ₂ arranged concentrically in the central portion thereof, and to connect them. The above-mentioned short part and the curved part 3 which form the inner circular groove 15 of the dimension which becomes the space | interval or intermediate insertion with respect to the inner and outer peripheral surfaces 7 ₁ and 7 ₂ of the end 7 of one pipe 8. circles may be to have a normal wall (14 _1, 14 ₂₎ surrounded cheaper, outer gokban part (3 with a) a width wider end a circular groove 16 'in the middle of which is open towards the flange surface (2).

. In addition, The pipe flange 6 'made of sheet metal press used to form the flange seam 1' described in the above is a short cylindrical wall surface 14 ₁ , 14 ₂ arranged in concentric circles and a pipe connected by connecting them ( The curved part 3 which forms the inner circular groove 15 of the dimension which becomes the space | interval gap or intermediate | interval gap with respect to the inner and outer peripheral surfaces 7 ₁ and 7 _{2 in} the edge part 7 of 8), and Flange face 2 having an outer circumferential portion 3 ', which is bent in the opposite direction with an outer circular groove 16 opening towards the flange face ₂ , which encloses a short cylindrical wall face 14 ₁ , 14 2. The wall surface 14 ₃ whose direction is short along the axis extended to the side may be arrange | positioned concentrically, and the cross section in the center part may be formed in zigzag form.

. Further, the pipe flange 6 'made of sheet metal press may have the structure described in the preceding section provided with an end circular groove 16' of an outer axis which has widened in the middle to open the flange 6 '.

. In addition, the coupling method between the tube 8 and the tube flange 6 or the sheet metal press flange 6 'according to the present invention includes the end 7 of the tube 8 to be connected. Tube flanges (6) described in the preceding paragraph; or Inserted into the inner circular groove 15 in the pipe flange 6 'made of sheet metal press as described in the above, the tube 9, the short cylindrical wall surface 14 ₁ , 14 ₂ and the curved part 3 Is enlarged along the flare shape open toward the flange face 2 to integrally corrugate the portion 4 of the tube flange 6 or the sheet metal press tube flange 6 'with the end 7 of the tube 8. It is characterized by combining as.

. In addition, the end 7 of the pipe 8 to be connected is Protest tube flange (6), Term or Inserted into the inner circular groove 15 in the sheet metal press flange 6 'of the sheet metal press described in the above, the end portion 7 of the tube 8 and the short cylindrical wall surface 14 ₁ , 14 ₂ and the curved portion The end portion 7 of the tube 8 and the pleats 4 for wrapping the tube 3 are pushed along the part of the flared shape opened toward the flange surface 2 and pressed in the axial direction. The tip portion 4 ₁ is bent in the direction along the flange face 2 to integrally form the corrugation portion 4 of the flange 6 or the sheet metal press pipe flange 6 'and the end portion 7 of the tube 8. May be combined.

. The flange joint 1 of this invention is the inner and outer peripheral surfaces 7 in the short cylindrical wall surfaces 14 ₁ and 14 ₂ arrange | positioned concentrically in the center part, and the edge part 7 of the pipe 8 connected and connected to this. 1,7 2) a circumferential part 3 forming an inner circular groove 15 having dimensions of interfitting or interfitting with respect to the gap between the gaps ₁ and 7 ₂ , and the short cylindrical wall surface 14 ₁ , 14 ₂ . A tube flange 8 having a curved portion 3 which is bent in the opposite direction with an outer circular groove 16 opening toward the flange face 2 is manufactured in a press working or other workable manner, and is to be connected. The end 7 of the tube 8 is inserted into the inner circular groove 15 to be protected and supported, and the end 9 of the tube 8 and the short cylindrical wall surface 14 ₁ , 14 _{2 are} formed by using a mold. The pipe flange 6 is pushed and widened along the flare shape (for example, a conical surface having a predetermined outer angle α) of the curved portion 3 toward the flange surface 2 at once. To form a substantially parallel with the flared opening at the center.

. Moreover, the outer circular groove 16 which opens toward the flange surface ₂ which enclosed the short cylindrical wall surfaces 14 ₁ and 14 ₂ also opposes both sides by being pressed by the above-mentioned press-in of the metal mold | die. This contact allows the reaction force of the force applied to the inside of the short cylindrical wall surface 14 ₁ to be pushed to the mold via the pipe flange 6 so that the inner circular groove 15 is deformed. This tightly clamps the end 7 of the deformed tube 8. In addition, since the outer circular groove 16 is folded and pressed, an appropriate buffering action is applied to prevent an excessive load on the mold, and the end 7 of the enlarged tube 8 and the corrugation 4 are integrally formed. Tightened and combined. In this way, the corrugation part 4 which opens in a flare shape toward the flange surface 2 in the center part, its tip was bent inward, and formed the curved part 3, and the flange surface 2 which enclosed this corrugation part 4 was formed. A flange seam (1) consisting of a flange (6) with an annular cut face (5) in the crankshaft and an expanded tube (8) of an end portion (7) sandwiched in the middle of the corrugation (4), and a flange (6) and pipe (8) are connected with sufficient bonding strength as flange joints (1) for general piping handling relatively low pressure fluids or for structural use that is not subjected to extremely large lateral forces.

. When the flare shape is formed into a conical surface 9 having a predetermined taper angle α, the flare shape in which the end portion 7 of the tube 8 and the corrugation portion 4 wrapping the flare shape is opened toward the flange surface 2. The mold used for pressing and expanding may be of an extremely simple structure. However, if the tube 8 and the tube flange 6 together are made of a material having a large load capacity, and the thickness of the tube 8 and the corrugation 4 is not particularly thin, an appropriate taper angle α in consideration of the thickness of the flange 6 is considered. By selecting, a sufficient bond strength between the pipe flange 6 and the pipe 8 can be obtained.

. Incidentally, the tapered angles α ₁ , α ₂ , α ₃ ... When formed into a conical surface 9 'having a small portion, the taper angle α ₁ has a function of retaining airtightness mainly between the tube 8 and the tube flange 6, and a portion large at the taper angle has a shaft of the tube 8. It acts to prevent the end 7 of the tube 8 from being pulled out of the tube flange 6 when a large torque or vibration is applied in the perpendicular direction. For this reason, since the pull-out resistance in the flange 6 can be taken larger than the case where the flare type is made into the conical surface 9 which has the predetermined taper angle (alpha) mentioned above, the elongation of the material to be used and the pipe 8 are used. It is advantageous to use the larger diameter of.

. Furthermore, if the flared shape is formed into a curved surface 9 along a curve in which the taper angle α is continuously increased, the force concentration of the joint of the joint can be avoided only when the load is applied to the tube 8 or the tube flange 6. In addition, the finish is beautiful and the added value of the product rises.

. The flare type has a conical surface 9 having a predetermined taper angle α, a plurality of gradually increasing taper angles α ₁ , α ₂ , α ₃ ,... A conical surface 9 'having a concave surface 9' or an annular shape at the flange surface 2, formed of a curved surface 9 along a curve that continuously increases gradually and a surface 10 parallel to the flange surface subsequent thereto. When the cutting surface of the tube 7 is configured to surround the corrugated portion 4 bent by bending the tip portion 4 'to wrap the end 7 of the tube 8 deformed into the above-described shape, 4) The pull-out resistance from 4) is much larger, and a larger tightening force can be obtained by a relatively small press, so that the material used for the pipe 8 and the pipe flange 6 has a large extension, and the pipe 8 This shape may be used when the diameter is large and the thickness is thin and can withstand large deformation.

. Moreover, when weight reduction is important because it handles relatively low pressure fluids, such as a muffler for automobiles and other vehicle silencers, the sheet metal press pipe flange 6 'may be used. First, a gap between the short cylindrical wall surfaces 14 ₁ , 14 ₂ arranged concentrically in the center and the inner and outer peripheral surfaces 7 ₁ , 7 ₂ of the end 7 of the pipe 8, which are connected to each other, is interposed therebetween. Or an outer circular shape which surrounds the curved portion 3 and the short cylindrical wall surfaces 14 ₁ , 14 ₂ , which form an inner circular groove 15 having dimensions of intermediate insertion, and opens toward the flange surface 2. It has an outer curved portion 3 'that is turned over in the opposite direction with the groove 16 and has a direction along the axis extending up to the flange surface 2 (not only the direction parallel to the axis, but also parallel to the flare shape). A short wall surface 14 ₃ of the up to a direction is arranged on a concentric circle, and the edge 13 bent at right angles to the periphery of the flange surface 2 while the cross section at the central portion is formed in a zigzag shape. Press sheet metal having a predetermined strength or elongation of the sheet metal press flange 6 ' It is produced as.

. In this way, in spite of being light in weight, a strong pipe flange 6 'is obtained in use, and an end portion of the pipe 8 to be connected to the inner groove 15 by covering the flange 6' on a mold is formed. 7) end portion 7 of the tube 8 sandwiched between the short cylindrical wall surfaces 14 ₁ and 14 ₂ , the curved portion 3 and the gaps between them using opposing molds and presses. The back is pushed open along the flare shape opened toward the flange face 2. Then, each of the above members is deformed to form the opening along the flare at the center of the flange 6 ', almost the same as the tube flange 6 described in the above section G, and the short cylindrical wall surface 14 described above. ₁ , 14 ₂ ), the ends 7 and the curved portions 3 of the tubes 8 inserted therein also deform substantially in parallel with the flare.

. On the other hand, the outer groove 16 opening toward the flange surface 2 and the outer circumferential portion 3 'turned over in the opposite direction are also pressed, so that the short cylindrical wall surface 14 ₂ and the flange surface (deformed as described above) are pressed. Since the short wall surface 14 _{3 in} the direction along the axis extending up to 2) abuts, the reaction force of the force applied to the inside of the short cylindrical wall surface 14 while rolling is supported by the pipe flange 6 '. It can be burdened by a mold, and the end portion 7 of the deformed tube 8 is firmly held by the deformed inner groove 15. In this way, the end portion 7 of the pleated portion 4 and the expanded tube 8, which are flared in the central portion toward the flange face 2 and whose tip is turned inward to form the curved portion 3, The outer corrugated portion 4 ', which is integrally caulked and extended to the flange face 2, is in close contact with each other, and a flange seam 1' having a pipe flange 6 'made of sheet metal press is formed.

. The above-mentioned S to U have described the fluid conveying flange seam 1 ', but the present invention is not limited to the above, and the free access of the upper end member of the pipe support, the fixed base, and the electric calculator chamber, which is a construction temporary construction material. It is also available as flanged joints for mechanical structures, such as tie bolt collars for floor or reinforced concrete molds. In this case, since the torque applied to the joint between the tube flange 6 'and the tube 8 is larger than that of the above-described vehicle silencer muffler, a relatively large plate 8 and a relatively flat plate having a zigzag cross section at the center portion are formed. Although a thick sheet metal press tube flange 6 'is used, the flange face 2 preferably has a flat plate shape, and it is not necessary to provide the edge metal 13 bent at right angles to the periphery thereof.

. Example

Hereinafter, an Example of this invention is described according to drawing, comparing with the other invention which the inventor passed the various test which patented first.

Example 1

FIG. 1 is a longitudinal sectional view of an embodiment that best illustrates the characteristics of the flange joint 1 of the present invention, and FIG. 2 is a tube flange 6 and a tube 8 used for the production of the flange joint 1 shown in FIG. Fig. 3 is a longitudinal cross-sectional view showing the relationship between the pipe flange 6, the pipe 8 and the mold in the final step of producing the flange joint 1 shown in Fig. 1. The pipe 8 shown in FIGS. 1 to 3 is a type corresponding to SUS 304TP of stainless steel pipe for JIS G3459 piping, and the diameter shown in Annex 2 "Dimensions and mass of stainless steel pipe for piping" in JIS. I) An electric resistance welded tube having an outer diameter of 17.3 (+0.050) mm and a thickness of 1.2 (+ 0.2-0.2) mm corresponding to 10, Schedule 5S was used. In the flange 6, a hot rolled stainless steel sheet having a thickness of 9 mm and a width × length of 1219 × 2438 mm, corresponding to SUS 304HP of JIS G4304, was used as a reference to the standard dimension subtable of JIS B2210 steel pipe flanges using a press. The shape (approximately the outer diameter of the flange of the provided steel pipe 17.3mm) (approximately the outer diameter of the provided steel pipe 17.3mm) shown in "Reference dimensions of 5K flange" is small and the center hole is small. Short cylindrical wall surfaces 14 ₁ , 14 ₂ concentrically arranged in the center of the material pierced with the center distance C = 55 mm, number = 2, diameter h = ψ 12 mm of the holes, and then connecting them In order to install the curved part 3 which forms the inner circular groove 15 which mutually spaces with respect to the inner and outer peripheral surfaces 7 ₁ and 7 ₂ of the edge part 7 in the one pipe 8, The flange surface 2 surrounding the short cylindrical wall surfaces 14 ₁ and 14 _{2 with} ψ17.3 (+0.050) mm and inner diameter 14.9 (+ 0.45-0.4) mm. The outer circular groove 16 along the inner conical surface of the taper angle α = 50 ° opening toward it is provided, and the outer curved portion 3 'bent in the opposite direction has the same shape as the cross section shown in FIG. Was used.

. Into the inner circular groove 15 of the tube flange 6, as shown in FIG. 2, the end 7 of the tube 8 is inserted, and a short cylindrical wall surface is formed by using the mold shown in FIG. (14 ₁ ), (14 ₂ ) and the curved portion (3) by pressing along the conical surface (9) opened at the taper angle α = 50 ° toward the flange surface (2), the short cylindrical wall surface (14 ₁ ), 14 ₂ , the end 7 of the tube 8, the curved portion 3, and the like, are deformed almost in parallel with the mold as shown in FIG. 3, so that an opening in the center portion along the conical surface 9 is formed. . Moreover, the outer circular groove which encloses short cylindrical wall surfaces 14 ₁ and 14 ₂ and opens toward the said flange surface 2 along the inner conical surface parallel to the conical surface 9 of taper angle (alpha) = 50 degrees. Since the opposing side surfaces of the 16 are crushed and abutted, the end portion 7 of the deformed pipe 8 is firmly held by the deformed inner circular groove 15 in the flange 6. In this way, the center part is opened in a flare shape (in this case, a conical surface having a taper angle of α = 50 °) toward the flange face 2, and the tip end is turned inward to form the curved portion 3. (4) and a flange having a cut surface 5 of an annular shape (in this case, an annular ring along a conical surface having a taper angle of α = 50 °) from the flange face 2 surrounding the corrugated portion 4. 6 and the expanded tube 8 of the end portion 7 sandwiched between the corrugations 4 were integrally caulked to form a flange joint 1 having a healthy and beautiful joint.

. In this embodiment, the metal tube is inserted into the center through-hole of the connecting flange like the metal tube with the connecting flange described in Japanese Patent Laid-Open No. 1-105088, and the end of the connecting surface side of the connecting flange is expanded to the outer peripheral side. Iv) It is not necessary to invert and install the inverting portion, but simply the inner side of the short cylindrical wall surface 14 ₁ , 14 ₂ arranged concentrically on the central portion of the tube flange 6 and the curved portion 3 connecting them. The end portion 7 of the tube 8 is inserted into the circular groove 15 formed in the groove, and the short cylindrical wall surfaces 14 ₁ , 14 ₂ and the curved portion 3 are flanged by using a mold. Joining operation of the pipe 8 and the pipe flange 6 is to caulk the flange 6 and the pipe 8 together as the pressure is widened along the conical surface having a taper angle of α = 50 ° toward. Is extremely simple and workable. In addition, there is no need for a special press for diametrically inverting the end of the metal tube inserted into the center through hole of the connecting flange to the outer circumferential side and a press die provided with an inverting portion at the end of the tube.

. Comparative Example 1

Subsequently, the plan for connection described in Japanese Patent Laid-Open No. 1-105088, in which the inventor of the present application first completed the joining strength of the caulking joint of the flange joint 1 manufactured by the method of the above-mentioned X, and passed various tests. In order to compare with the caulking joint of the branch metal pipe (Example 1), the same material is used to punch out the flange material, and has a through hole through which a pipe connected to the center can be inserted and connected to the connection side. An annular groove of 1.2 mm width is formed concentrically with the center through hole, and an annular wall having a thickness of 2 mm is provided between the annular groove and the center through hole (the shape and dimensions of the other parts are (Example 1) Same as the above). A mold for forming a reversing portion for inserting the same pipe as in the above embodiment into the center through hole of the connecting flange such as the above embodiment and expanding the end to the outer circumferential side to be inserted into the annular groove is manufactured. A stainless steel pipe for pipes with a diameter of 10 and a schedule 5S was used for expansion expansion test of the pipe ends. However, because the amount of deformation of the pipe member was too large, it occurred in the weld joint of the pipe, so that the pipe could not be expanded and reversed in a predetermined shape that could withstand the use, and the metal tube with a flange for connection of Comparative Example 1 could not be produced.

. Example 2

For this reason, a comparative test of joint strength is made by using a strong carbon steel pipe having a high tensile strength and elongation and a welded portion. Manufactured. As the pipe 8, JIS G3131 hot rolled steel sheet and steel strip SPHD were used for the flange 6, using JIS G342 automotive structural electric resistance welded carbon steel pipe STAM 290 GA having an outer diameter ψ 50.8 mm and a thickness of 1.6 mm. In a steel strip of 9 mm thickness and 600 mm width, the outer dimensions of the flanges were pressed using a press with a diamond shape of A × B = 118 × 80mm, with the center hole of the bolt hole C = 92mm, number = 2, diameter h = ψ10mm Short cylindrical wall surfaces 14 ₁ and 14 ₂ having a thickness of 2 mm concentrically arranged in the center portion, and 1.6 mm which are fitted to the tube 8 in succession (in the following embodiment, the dimension tolerance of the gap is Α = 50 ° toward the valley portion 3 forming the inner circular groove 15 of width and the flange surface 2 surrounding the short cylindrical wall surfaces 14 ₁ , 14 ₂ . The outer circular groove 16 opening along the inner conical surface having a taper angle of It was used a molding.

. The end portion 7 of the tube 8 is inserted into the inner circular groove 15 in the tube flange 6, and the cylindrical wall surfaces 14 ₁ , 14 ₂ and the curved portion are formed by using a mold. (3) is pushed and widened along the conical surface opened toward the flange surface 2 at the taper angle α = 50 °, and in the same manner as in Example 1 described in the above section X, an opening in the center portion along the conical surface is formed and By pressing the circular groove 16, the center part is opened in a flare shape toward the flange face 2, and the tip end thereof is folded back to the inside to form the curved part 3, and An expanded tube of a flange 6 having an annular cut face 5 from the flange face 2 enclosing the wrinkle part 4 and an end portion 7 sandwiched between the wrinkle part 4; An integrally caulked coupled flange joint 1 of (8) was formed.

. And the static load of the direction which connects two bolt holes through the indenter with the two bolts of the pipe flange 6 of the said flange joint 1 to the mounting stand of the tester which is not shown in figure. By applying weight, the moment acting on the caulking joint was applied, and the displacement amount with respect to the load until the flange joint 1 was broken was continuously measured. The typical load (kgf) / displacement (mm) diagram in Example 2 is shown in FIG. According to the fracture test, any of the test pieces exceeded the elastic limit (148 to 160 kg) and the displacement amount was 20 to 25 mm, and the load was the maximum value (hereinafter also referred to as pull resistance). 194.2 to 221.6 kg (elastic limit 1.311 Tube 8 and tube flange 6 remain in close coking engagement until the maximum value of ˜1.385 times. It was found to decrease slowly. Furthermore, when the load reaches 125 to 140 kg, the portion of the tip of the shaft 8 exposed at the corrugated portion 4 of the tube flange 6 changes in the ratio of the load to displacement amount. Increases rapidly.

. In other words, the maximum load in the second embodiment is as the tip 7 of the pipe 8 begins to slide in the corrugated portion 4 of the pipe flange 6 at the caulking engagement of the flange seam 1. Determined and has no direct bearing on the strength of the tube 8. When the same failure test was performed on the same connection flange metal tube according to the invention described in Japanese Patent Application Laid-Open No. 1-105088, the caulking joint may have started to slide at about 170 kg which is below the elastic limit, In the airtight test by the branch metal tube, it was confirmed that the nitrogen gas enclosed at 15 kg f / cm <2> did not leak, but could be used as a flange joint of 5 K of pressure pressure. For this reason, although the elastic limit of the flange joint 1 of Example 2 is also slightly low, when the moment acting on the caulking joint of the flange joint 1 is 190 kgx30 cm or less, there is no possibility that a caulking joint will loosen. It can be predicted that it can be used for piping for conveying a low pressure pressure fluid. Moreover, none of the test pieces had a large difference in pullout resistance (194.2 to 221.6 kg), and as shown in Fig. 4, the load / strain diagram was gentle, so that the airtightness was stable. The leakage amount gradually increases as the tip portion 7 of the c) slides on the pipe flange 6, and the direction in which the fluid is ejected is also limited to the direction along the end 7 of the pipe 8, which is very safe. . However, since the pullout resistance is not so large, the structural flange joint 1 requires further improvement.

. Comparative Example 2

Subsequently, in order to compare and examine the practicality of the flange joint 1 of Example 2, the same material as Example 2 was used, and the diameter of a pipe is large and the thickness is comparatively comparatively thin, using the same material as Example 2. The flange part metal pipe for connection described in Unexamined-Japanese-Patent No. 1-105088 was manufactured, and the same test was done. This theodolite load / displacement amount diagram is illustrated and demonstrated. Above It has a through hole for inserting and joining the pipe connected to the center by the material shown in the paragraph, and forms a annular groove of 1.6 mm width concentric with the center through hole on the connecting side, and between the annular groove and the center through hole. Of the same pipe as in Example 2 in which a connecting flange having a thickness of 2 mm was provided, and a connecting flange having a part shape and dimensions other than that same as that of Example 2 was manufactured, and inserted into a central through hole of the connecting flange. The inverted part is expanded by inverting the end portion to the outer circumferential side, and the inverting part is pressed into the annular groove of the connecting flange and the annular groove is pushed outward so that the side wall of the annular groove clamps the inverted part. The flange metal pipe was manufactured.

. In the test according to Comparative Example 2, as shown in Figs. 5 to 7, the caulking joint starts to loosen (sliding occurs) at a load of 185 to 275 kg (1.3 coordination just before the elastic limit). Is further raised and yield test of material yields (Yield Phenomenon). When the yield point is exceeded, the increase in elongation is remarkable, and the maximum load reaches 372.3 to 398.9 kg (1.615 to 1.856 times the elastic limit). In this connection flange metal tube shown in Comparative Example 2, even if the caulking coupling portion is loosened, since the inverting portion contacts the mounting table, the tube does not escape from the connection flange, and the load increases up to the maximum strength of the material. If the load exceeds the point indicating the maximum, local shrinkage appears in a part of the tube, and although the displacement amount is further increased, the load decreases slightly and displaces until the tube breaks. However, the caulking joint may loosen at a load of 185 kg, and fluid may leak, and thus, the flange joint for conveyance of the fluid cannot be used to apply more than this load. As a result, the metal tube with a flange for connection is uneven in the airtightness of the caulking coupling part, and the pipe may be broken and the fluid may be ejected. Therefore, it cannot be used as a pipe for conveying a pressure fluid that is too high in pressure. Moreover, even when used as a structural flange joint, since the pipe is not able to be used up to the maximum strength at which the pipe breaks, its allowable force does not differ significantly from the flange joint 1 of the second embodiment.

. Example 3

Subsequently, another embodiment of the present invention will be described with reference to FIGS. 8 and 9. In this example, the flare is formed by a conical surface having several gradually increasing taper angles α ₁ , α ₂ . The material and dimensions of the pipe 8 are made of a material corresponding to the alloy number C1220 of JIS H3320 copper and copper alloy welded pipe, having a diameter of 22 mm and a thickness of 1 mm. The flange 6 is made of JIS H3100 copper and a copper alloy plate. JIS B2240 Copper Alloy Pipe Flange Reference Dimensions in Brass Studs of Thickness 10mm, Width 365mm and Length 1200mm Equivalent to Alloy Number C2801 and Symbol C2801 R in Table 1, Types and Symbols, "Reference Dimensions for Arc Pressure 5K Flange" In the press to the outer diameter ψ D = 85mm of the flange, the diameter C = 65mm of the bolt hole center circle, the number = 4, and the diameter h = ψ12mm according to the arc diameter C 20 [outer diameter (2) ψ22.22mm of the applied pipe) shown in the figure. In the center of the perforated material, the outer diameter ψ22mm and width 1mm, which are intermediated with each other, with respect to the short cylindrical wall surfaces 14 ₁ and 14 ₂ having a thickness of 1.6 mm arranged in a concentric circle and the pipe 8 connected thereto. A curved portion 3 forming the circular groove 15 inside the phosphorus and the above short cylindrical wall Has a (14 _1, 14 ₂₎ surrounding the flange surface (2), the taper angle _{α = 58 °, α 2 =} 104 ° the outer circular groove 16 along the chumyeon second step admission of which is open towards the opposite The outer curved portion 3 is formed to be bent in the direction.

. The end 7 of the tube 8 is inserted into the inner circular groove 15 of the tube flange 6, and a short cylindrical wall surface is formed by using a mold in the same manner as described in the above section X. (14 ₁ ), (14 ₂ ), the curved portion 3 and the end 7 of the tube 8 toward the flange face 2 in two steps of taper angle α ₁ = 58 ° and α ₂ = 104 ° When pressed along the open cone surface, the flare shape (in this case, a conical surface having a gradually increasing taper angle) opens toward the flange surface 2, and its tip is bent inward to form the curved portion 3. A flange 6 having a pleated portion 4 and an annular cut face 5 from the flanged surface 2 surrounding the pleated portion 4, and an end sandwiched in the middle of the pleated portion 4 ( The expanded tube 8 of 7) may be integrally caulked to form a flanged seam 2 with a secure joint joined.

. Thus, the pipe flange joint 1 manufactured as described above is In the same manner as described above, the moment acting on the flange 6 was applied, and the displacement amount with respect to the load was continuously measured. The diagram shows a shape similar to that of the second embodiment, and the maximum load was 1.523 to 1.635 times the elastic limit. Therefore, it is found that it is stronger than being widened by pressing along a conical surface having a predetermined taper angle α = 50 °. Nitrogen gas with an air pressure of 12 kg f / cm2, if the joint is not loosened to the elastic limit of the material when the connection flange part metal tube previously shown in Japanese Patent Application Laid-open No. 1-105088 is tested with the same size and material. Was confirmed to have sufficient airtightness and strength as the connection flange metal pipe, and the flange joint 1 of Example 3 was judged to be sufficiently practical to withstand.

. Example 4

Also, another embodiment of the present invention will be described with reference to FIGS. 10 and 11. In this example, the flare type is formed of a curved surface along a curve in which the taper angle α _x continuously changes. The material and dimensions of the tube 8 are The outer circular groove 16 which also opens the flange 6 toward the said flange surface 2 using the same thing as what was described in the paragraph is mentioned above except that it is formed as a curved surface along the arc-shaped curve. It is the same as described in the paragraph. The flange seam 1 manufactured by such a pipe 8 and a pipe flange 6 is described above. The displacements with respect to the load were continuously measured in the same manner as in the example described in the paragraph, and the maximum load was 1.586 to 1.705 times the elastic limit, and there was no significant difference from the flange joint 1 of Example 3, but in this example Since the corrugation part 4 of the pipe flange 6 which clamps the edge part 7 of (8) is a smooth curved surface, a beautiful caulking joint can be formed, and when a load is loaded, local tension may generate | occur | produce in a joint. No worry and safer.

. Example 5

Next, another preferred embodiment of the present invention will be described with reference to FIGS. 12 to 14. In this example, as the pipe 8, the JIS G3472 automotive structural electric resistance welded carbon steel pipe STAM 290GH having the same outer diameter ψ50.8mm and thickness of 1.6mm was used as the pipe 8, and the flange 6 was also subjected to JIS G3131 hot rolling. As a steel strip of 9mm thickness of soft steel plate and steel plate SPHD, the outer dimensions of the flange as shown in Fig. 12 using a press A × B = 118 × 80mm, the center distance of the bolt hole C = 92mm, number = 2, diameter h = After burring a hub with a diameter of φ63mm and a thickness of 13.5mm at the center of the material pierced with ψ11mm, a short cylindrical wall (14 ₁ ), (14 ₂ ) with a thickness of 2mm arranged concentrically at the center, followed by 1.6mm An inner circle having a taper angle of 50 ° toward the flange portion 2 enclosing the curved portion 3 and the short cylindrical wall surfaces 14 ₁ , 14 ₂ forming the inner circular groove 15 of width. Outer circumference with an end circular groove 16 which has a width opening along the surface in the middle and is bent in the opposite direction To 3 it was used to form the press.

. The end portion 7 of the tube 8 is inserted into the inner circular groove 15 in the tube flange 6, and the cylindrical cylindrical surface 14 ₁ , 14 is short using the X-terminal mold. ₂ ), the curvature 3 and the end 7 of the tube 8 are enlarged by pressing along the conical surface open toward the flange face 2 at a taper angle α ₁ = 50 °, as shown in FIG. 13. Press the mold to the lower end of the circular groove 16, and then press the mold further in the axial direction to plan the end portion 7 of the tube 8 and the tip portion 4 of the corrugation portion 4 to wrap it. Of the distal end portion 4 which bends in the direction along the ground 2 to be inserted into the upper portion of the end circular groove 16 and wraps the end portion 7 of the tube 8 as described above in the flange surface 2. By forming the annular cut surface 5 which encloses the bent corrugation part 4, the corrugation 4 of the said pipe flange 6 and the edge part 7 of the pipe 8 are integrally tightened, and are firmly joined. copula The flange joint 1 with which it was provided was formed.

. Such a flange joint 1 is It was attached to the test machine described in the section, and the same test as in Example 2 was carried out to continuously measure the amount of displacement with respect to the load. Neither specimen showed a gentle curve after the load exceeded the elastic limit, and no sudden change in yielding behavior was observed. Moreover, it is not apparent that while the load is rising, the caulking joint is loosened and the tube 8 starts to slide. The maximum load reaches 235.5 to 264.8 kg f (1.581 to 1.655 times the elastic limit), and when the displacement reaches 64 to 70 mm, the rate of displacement increases with decreasing load is relatively large. (8) The end 7 is partially pulled out of the tube flange 6. Thus, it was found that the flange joint 1 without a yielding phenomenon and having a large maximum load was able to withstand a lateral force considerably as well as for conveyance of fluid and for structural use, and is suitable for various uses.

. Example 6

Finally, the most preferred embodiment of the present invention will be briefly described with reference to FIGS. In this example, the same conduit as shown in Fig. 15 formed from the same pipe 8 as Example 5 and a steel strip having a thickness of 2.6 mm and a width of 600 mm corresponding to the SPHD of the JIS G3131 hot rolled steel sheet and steel strip Short cylindrical wall surface 14 ₁ and 14 ₂ , followed by a curved portion 3 and a short circle forming an inner circular groove 15 having a width of 1.6 mm which is subsequently inserted into the tube 8. It is usually equipped with a wide circular groove 16 opening toward the flange face 2 surrounding the wall faces 14 ₁ and 14 ₂ and having an outer curved portion 3 'bent in the opposite direction. 2) The short wall surface 14 _{3 in} the direction along the axis extending up to 2) is arranged in a concentric circle, and the outer dimension formed in a zigzag cross section at the center part is A × B = 124 × 88mm, the center distance of the bolt hole C = 92mm Plate with edge t = 10mm, number = 2, diameter h = ψ10mm and bent at right angles to the periphery It was used as the tube flange of the press.

The end portion 7 of the tube 8 is inserted into the inner circular groove 15 in the tube flange 6 ', and a short cylindrical wall surface 14 ₁ , using a mold in the above X term, (14 ₂ ), the curved portion 3 and the end 7 of the tube 8 are widened along the conical surface open toward the flange surface 2 at a taper angle α ₁ = 50 ° (see FIG. 16), The die is further compressed in the axial direction so that the end portion 7 of the tube 8 and the tip portion 4 ₁ of the corrugation portion 4 wrapping them are bent in the direction along the flange surface 2 as shown in FIG. An annular cut face in the shape of a circumference of the corrugation 4 which is enclosed in the wide circular groove 16 and wraps the end portion 7 of the tube 8 which is bent the tip in the flange face 2 as described above. By forming (5), the corrugation (4) of the pipe flange (6) and the end portion (7) of the pipe (8) integrally caulking to form a flange joint (1) with a firm joint.

Such a flange seam 1 'is It was attached to the test machine described in the above section, and the same test as in Example 2 was carried out to continuously measure the displacement amount with respect to the load. Neither specimen showed a gentle curve after the elastic limit and no sharp change in yielding behavior. Moreover, it was not clear that while the load was rising, the caulking joint became loose and the tube 8 started to slip. The pullout resistance reaches 258.5 to 296.4 kg f (1.722 to 1.765 times the elastic limit). When the displacement amount reached 35 to 46 mm, the ratio of the displacement amount increased with the decrease of the load was relatively large. Then, the end portion 7 of the tube 8 was severely plastically deformed and partially pulled out of the tube flange 6. As a result, in this example, the pullout resistance was large while having the desirable characteristics similar to those of Example 2, and the maximum permissible force was close to that of Comparative Example 2. Therefore, if it is the flange joint 1 shown in Example 6, it can use not only for fluid conveyance but for structural use instead of the comparative example 1. In addition, in order to use the lightweight sheet metal press flange 6 ', it is more advantageous to aim at workability at the time of manufacture, stability of the quality, and weight reduction as in the case of a vehicle.

Example 7

As mentioned above, although the typical Example was demonstrated, this invention used the sheet metal press pipe flange 6 'provided with the expanded circular groove 16' in the width | variety described in said J in the middle, aluminum Flanged joints made of pipe and aluminum alloy pipe flanges, titanium, tantar, other metals or alloys thereof, or flange joints made of dissimilar metals. It can implement in various other aspects within the range described.

As described in detail above, the flange joint according to the present invention can use a thin pipe because there is no sealing material, a screw, or a welded portion as in the prior art, and furthermore, when the pipe flange made of sheet metal press is used, it is extremely lightweight. Also suitable for. Moreover, it is excellent also in oxidation resistance in high temperature gas atmosphere. In addition, the pipe flange of the present invention has a simple structure as a pipe joint used for a thin pipe, and can be mass-produced by press working, cutting, or other means. In addition, the method of joining the pipe and the pipe flange of the present invention is to tighten by using a press and a dedicated mold, so that no special function is required, such as welding or soldering, and the working environment is not contaminated by gas or fume. . Moreover, workability is very good, bonding strength is large, and quality is stable. Moreover, since it can use also for the pipe | tube and pipe flange by the metal or dissimilar metal which are difficult for welding and soldering, it is industrially extremely advantageous.

Claims (12)

The flap part 4 which opens flare-shaped toward the flange part 2 in the center part, and the front end is folded inward and forms the curved part 3, and the flange face 2 which surrounded this crease part 4 Flange joint, characterized in that it consists of a pipe flange (6) having an annular cut surface (5) in the c), and a tube (8) with an end sandwiched in the corrugation portion (14). The flanged joint according to claim 1, wherein the flared shape is formed of a conical surface (9) having a predetermined taper angle. 2. Flange seam according to claim 1, characterized in that the flare is formed into a conical surface (9 ') having several gradually increasing taper angles. 2. Flange joint according to claim 1, characterized in that the flared shape is formed into a curved surface (9) along a curve in which the taper angle continuously increases. 2. Flange joint according to claim 1, characterized in that the flare is formed by a conical surface (9) (9 ') or a curved surface (9) and a surface (10) parallel to the flange surface (2) following it. The corrugation part 4 and the corrugation part 14 of Claim 1 thru | or 5 which flare-shaped toward the flange surface 2, the tip end is folded inward, and the curved part 3 is formed. The outer side that is folded along the annular cut surface 5 at the enclosed flange surface 2 in the opposite direction to the circumferential portion 3 to form the outer curved portion 3 'and extends to the flange surface 2. Characterized in that it consists of a pipe flange 6 'made of sheet metal press, the diameter of which is arranged in a concentric circle, the cross section of the center portion being zigzag-shaped, and the tube 8 having the end portion 7 sandwiched in the corrugation. Flange seam. Insertion of gaps between the inner and outer peripheral surfaces 7 ₁ and 7 ₂ of the short cylindrical wall surfaces 14 ₁ and 14 ₂ arranged concentrically in the center and the ends 7 of the pipes 8 which are connected to each other. Or opposite with a circumferential portion 16 forming an inner circular groove 15 having dimensions of intermediate insertion and an outer circular groove 16 opening toward the flange surface 2 surrounding the short cylindrical wall surface. A pipe flange used to form a flanged seam, characterized in that it has an outer curvature 3 'that is folded back in the direction. The inner and outer circumferential surfaces 7 ₁ , 7 ₂ of claim 7, wherein the short cylindrical walls 14 ₁ , 14 ₂ arranged concentrically in the center and the ends 7 of the pipes 8 connecting them are connected. The width of opening toward the flange part 2 which encloses the curved part 16 which forms the inner circular groove 15 of the dimension which becomes a mutual gap insertion or an intermediate insertion with respect to the said short cylindrical wall surface A pipe flange for use in forming a flanged seam, characterized in that it has an outer circumferential portion (3 ') with an end circular groove (16') struck at the bottom. 8. The inner and outer circumferential surfaces 7 ₁ and 7 ₂ of the end portion 7 of the tube 8, which are connected to the short cylindrical wall surfaces 14 ₁ , 14 ₂ arranged concentrically. Opening toward the flange face 2 which surrounds the curved portion 16 and the short cylindrical wall face 14 ₃ which form an inner circular groove 15 having dimensions of mutual insertion or intermediary insertion. A wall surface 14 ₃ having a short direction along an axis extending to the flange surface 2 having an outer curved portion 3 'with an outer curved groove 16 having an outer circular groove 16 is disposed on a concentric circle and has a cross section at the center portion. A pipe flange made of sheet metal press used to form a flanged joint, which is formed in a zigzag shape. 10. The pipe flange made of sheet metal press according to claim 9, further comprising an outer end circular groove (16 ') having a width widened to the flange face (2). The end 7 of the pipe 8 to be connected is inserted into the inner circular groove 15 in the pipe flange 6 or the pipe flange 6 'made of sheet metal press, and the end 9 of the pipe 8 is inserted. ) And the short cylindrical wall surface (14 ₁ ) (14 ₂ ) and the curved portion (3) by pressing open along the flare shape open toward the flange surface (2) the tube flange (6) or sheet metal press flange (6) A method of joining a pipe and a pipe flange, characterized by integrally caulking the end portion (7) of the pleats (4) and the tube (8) of the '. 12. The tube (6) according to claim 11, wherein the end (7) of the tube (8) to be connected is inserted into an inner circular groove (15) in the tube flange (6) or a pipe flange (6 ') made of sheet metal press. The end portion 9 of 8) and the short cylindrical wall surface 14 ₁ , 14 ₂ and the curved portion 3 are pushed apart along the part of the flared shape opened toward the flange surface 2 and pressed in the axial direction. The end portion 7 of the tube 8 and the end portion 7 ₁ of the tube 8 bent in the direction along the flange face 2 with the end portion 7 1 of the tube 8 and the corrugation portion 4 wrapping the same. Coupling method of the pipe and the pipe flange, characterized in that the caulking coupling integrally (4).