WO2015072571A1 - 流体送給管の継手部の転造加工方法および流体送給管 - Google Patents
流体送給管の継手部の転造加工方法および流体送給管 Download PDFInfo
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- WO2015072571A1 WO2015072571A1 PCT/JP2014/080379 JP2014080379W WO2015072571A1 WO 2015072571 A1 WO2015072571 A1 WO 2015072571A1 JP 2014080379 W JP2014080379 W JP 2014080379W WO 2015072571 A1 WO2015072571 A1 WO 2015072571A1
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- Prior art keywords
- vertical wall
- outer peripheral
- peripheral surface
- tubular body
- tube
- Prior art date
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- 238000005096 rolling process Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000012530 fluid Substances 0.000 title claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 56
- 238000012545 processing Methods 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 238000000465 moulding Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000003672 processing method Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 38
- 230000002265 prevention Effects 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000035617 depilation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000005482 strain hardening Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000003405 preventing effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 238000007545 Vickers hardness test Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/06—Corrugating tubes transversely, e.g. helically annularly
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
- B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
- B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
- B21H7/182—Rolling annular grooves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L17/00—Joints with packing adapted to sealing by fluid pressure
- F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
- F16L17/04—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket with longitudinally split or divided sleeve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/06—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/04—Flanged joints the flanges being connected by members tensioned in the radial plane
Definitions
- the present invention relates to a rolling process method for joints of fluid supply pipes such as connected water pipes and water and sewage sanitary pipes that are piped in buildings and used for fire fighting activities.
- Fluid supply pipes such as connected water pipes and water and sanitation pipes that are piped to buildings and used for fire fighting activities are laid by connecting pipes of a predetermined length with housing-type pipe joints. .
- housing type pipe joints as shown in FIG. 9, in the housing type pipe joint 20, a structure for preventing the pipe body 22 from coming out of the housing 23 is provided on the outer peripheral surface of the end portion of the pipe body 22.
- an annular locking protrusion 21 is formed and the locking protrusion 21 is engaged with the inner peripheral opening edge 24 of the housing 23 from the inside (Patent Document 1).
- Patent Document 1 as a method of forming the above-described locking protrusion on the outer peripheral surface of the end portion of the tubular body, a forming protrusion that is positioned inside the processed tubular body 22. 26 while rotating the inner convex roller 25 having 26 and the outer concave roller 27 having the forming annular groove 28 positioned outside the processed tube body 22 along the circumferential direction of the processed tube body 22. It describes that a locking protrusion is rolled on the outer peripheral surface of the end of the tubular body by applying pressure in the approaching direction.
- Patent Document 2 proposes a joint structure of a fluid supply pipe having an annular groove 29 formed on the inner peripheral surface of the pipe body.
- Patent Document 3 proposes a structure in which an annular locking member 30, which is a separate part from the tubular body, is joined to the outer peripheral surface of the tubular body by a welded portion 31.
- the joint structure of the fluid supply pipe using the locking protrusion formed by the rolling method on the outer peripheral surface of the pipe body proposed in Patent Document 1 does not require a separate part, and the pipe body to be processed Since the locking ridge can be formed only by rolling the tube end of the tube, the formation of the locking ridge is easy and advantageous in terms of cost.
- JP 2007-78052 A Japanese Patent No. 4774325 Utility Model Registration No. 3171690
- the cross-sectional shape of the locking ridge rises from the base portion connected to the outer peripheral surface of the tubular body, and the top portion is It forms, descends, and becomes the shape connected to the outer peripheral surface of a tubular body again.
- the fluid supply pipe having the joint portion in which the locking protrusion having such a cross-sectional shape is formed is fixed in combination with the housing.
- the surface of the housing that contacts the locking protrusion is substantially square.
- the applied tensile load F is in a downward direction along the tube wall in addition to the tube axis direction.
- a component force is generated as F ⁇ sin ⁇ .
- Such a component of the downward component generates a force by which the housing pushes the locking protrusion into the pipe.
- the locking ridge has a property of deforming to the same extent as the tube, it is considered that the locking ridge itself is easily deformed together with the tube as shown in FIG.
- the reaction force of the force generated in the downward direction also causes the housing to expand in the outer diameter direction, the possibility of pipe removal is further increased. For this reason, it is thought that the pulling out prevention force in a joint part, ie, the depipe prevention performance falls.
- the present invention has been devised to solve such a problem, and relates to a method for forming a locking protrusion on the outer peripheral surface of a joint portion of a fluid supply pipe by a rolling method.
- a locking ridge that provides a joint structure excellent in depilation prevention performance when pipe ends of a pipe having a locking ridge formed by the rolling method are fixed and joined by a housing. It is an object to provide a method of forming a film. Moreover, it aims at providing the fluid feed pipe excellent in the depipe prevention performance by having said joint part structure.
- the present invention is a rolling method of a joint portion of a fluid supply pipe that forms a locking ridge having a vertical wall portion with respect to the outer peripheral surface of a processed pipe body,
- the locking ridge includes a curved base extending from the outer peripheral surface, the vertical wall extending from the base, a bending extending from the vertical wall, and a top extending from the bending.
- the locking ridge is formed by processing means positioned on the inside and outside of the tube body, and the vertical wall portion is at an angle of 65 ° to 90 ° with respect to the outer peripheral surface in the tube axis direction.
- the total value of the radii of curvature of the surfaces of the processing means that are formed so as to rise and the height from the outer peripheral surface of the locking ridge to the protruding end of the top portion is positioned on the inner side and the outer side in contact with the tubular body It is formed as described above.
- a convex roller 10 positioned inside the processed pipe body 2 and a molding roller positioned outside the pipe body 2. It is preferable to form the locking protrusion 4 having the vertical wall portion 6 on the outer peripheral surface 3 of the tubular body using the concave roller 11 having the annular groove 12.
- the processing unit 10, 11 is positioned inside and outside of the tube 2, a predetermined curvature surface abutting the pipe radius R I, has the R U.
- the outer peripheral surface 3 of the tubular body By rolling the outer peripheral surface 3 of the tubular body so as to have a convex shape with a convex height 9 equal to or greater than the total value of these radii of curvature, the outer peripheral surface 3 in the tube axis direction is predetermined. It is possible to form the vertical wall portion 6 that rises at an angle of.
- the locking protrusion 4 after the rolling process includes a curved base portion 5 extending from the outer peripheral surface 3 of the tubular body 2, and a vertical wall portion 6 extending from the base portion 5.
- the shape includes a curved portion 7 extending from the vertical wall portion 6 and a top portion 8 extending from the curved portion 7.
- the vertical wall portion 6 has a shape rising at a predetermined angle with respect to the outer peripheral surface 3 in the tube axis direction.
- the locking ridge 4 mainly exhibits the locking effect when the vertical wall portion 6 comes into contact with the housing.
- the convex height refers to the height from the outer peripheral surface 3 of the tube 2 to be processed to the protruding end of the top 8 of the locking protrusion 4.
- the convex height When the convex height is smaller than the radius of curvature, most of the convex shape formed on the locking ridge by the rolling process is occupied by the curved portion 7 extending to the base portion 5 and the top portion 8, so that Since the ratio of the wall portion 6 is small, a sufficient locking effect cannot be exhibited.
- the convex height is excessively large, the rate of reduction of the plate thickness in the locking ridge increases, and the plate thickness becomes thin. This tendency is particularly remarkable at the base. For this reason, the locking protrusion has a low deformation resistance with respect to a tensile load and is easily deformed.
- the angle at which the vertical wall portion rises according to the present invention is preferably in the range of 65 ° to 90 °. As shown in FIG. 6 (b), the angle is such that when the joint portion of the pipe is viewed in cross section, a reference line 19b extending the outer peripheral surface 3 of the tube body 2 and a straight line 19c extending the outer surface of the vertical wall section 6 The angle 19a from the reference line of the outer peripheral surface extended inward of the locking ridge to the straight line of the vertical wall portion at the intersection point of.
- FIG. 6A is an example in which the vertical wall portion 6 extends perpendicularly to the outer peripheral surface 3 at an angle of 90 °.
- FIG. 6B is an example extending at an angle of less than 90 °.
- the vertical wall portion When the vertical wall portion is formed to have an angle of 65 ° or more, a large degree of processing is given when the vertical wall portion is formed, and sufficient work hardening is performed. High hardness is provided.
- the joint portion fixed to the housing When the joint portion fixed to the housing is used, a tensile load in the tube axis direction is applied, and the locking protrusion is deformed to be in surface contact with the housing, thereby reducing the surface pressure.
- the locking ridge having a higher hardness than the tubular body is less likely to be deformed than the tubular body, and thus the housing is resistant to a downward force that pushes the locking ridge into the tube.
- the ratio of the component of the downward component received from a housing reduces, so that the said angle is large.
- the tube withdrawal resistance against a tensile load is improved.
- the locking ridge does not have high hardness. Therefore, the housing is deformed to the same degree as the tubular body with respect to the downward force acting on the locking ridge. As a result, the ability to withdraw is reduced.
- the angle is preferably 65 ° or more, more preferably 70 ° or more, or 80 ° or more.
- a larger angle is preferable because the component of the downward component received from the housing is reduced.
- a locking protrusion having a vertical wall portion that rises vertically such as an angle of 90 ° is given a high degree of processing and high hardness is obtained.
- a surface contact state with a housing can be ensured, it is preferable.
- the hardness of the locking protrusion formed by the rolling method of the present invention is preferably about 1.2 times or more the hardness of the tube material. More preferably, it is 1.5 times or more and 2.0 times or more.
- the tube is processed and the vertical wall portion is perpendicular to the outer peripheral surface.
- a locking ridge extending in the direction can be formed.
- the concave roller 11 having the convex roller 10 and the forming annular groove 12 is rotated along the circumferential direction of the outer peripheral surface 3 of the tube 2 to be processed, and the directions are close to each other. It is preferable to form the locking protrusion 4 by processing into a shape.
- the tubular body 2 is deformed by the convex roller 10 and the forming annular groove 12 so that the plate thickness is reduced and the vertical wall portion 6 rising perpendicular to the outer peripheral surface 3 in the tube axis direction is formed.
- the locking protrusion which has is formed.
- the locking protrusion 4 is given a large degree of processing, and the hardness increases by work hardening.
- the present invention provides the outer peripheral surface in the case of machining using machining means in which the clearance between the convex roller 10 and the forming annular groove 12 is equal to or greater than the plate thickness of the tube to be processed.
- a convex portion (projected portion) 4 ′ can be formed on the convex portion 4, and the convex portion can be used as the locking protrusion 4.
- the convex portion is then moved to the convex roller by moving the forming annular groove 12 in the tube axis direction of the tube 2 to be processed, as shown in FIG. 10 to form a locking ridge having a larger angle.
- the convex height of the convex portion is R I given to the tip of the convex roller located inside, and the tip surface of the annular groove for molding located outside it is necessary to form the convex portions so that the above total of the R U granted at the intersection of the inner vertical wall surface.
- a ring 13 having an annular groove for molding is mounted on the outer peripheral surface 3 of the tube 2 to be processed, and the inner convex roller 10 is attached to the circle of the tube.
- the locking protrusion 4 may be formed by rolling in a direction close to each other while rotating along the circumferential direction. That is, the locking protrusion is formed by a combination of a forming annular groove positioned on the outer side of the tubular body and a convex roller positioned on the inner side.
- the rolling method of the present invention can provide a high degree of processing and form a locking protrusion with high hardness. Therefore, even if a large tensile load is applied to the joint portion of the fluid supply pipe, the deformation of the locking ridge is suppressed, so that the pipe withdrawal prevention property can be improved.
- the locking ridge when the tube ends forming the locking ridges are fixed and joined by a housing, when a tensile load is applied in the tube axis direction, it is appropriately deformed, As shown in FIG. 7, a joint portion structure is formed in which the vertical wall surface of the locking protrusion formed on the fluid supply pipe and the inner wall surface of the housing are in surface contact. Therefore, the area where both the locking protrusion and the housing come into contact increases, and the load applied per unit area is reduced accordingly. Furthermore, even if a tensile force acts in the tube axis direction, the rate at which the component force of the downward component is generated is reduced. As a result, the ability to prevent extraction from the housing is improved. In particular, a locking ridge having a vertical wall portion that rises vertically at an angle of 90 ° has a large surface contact area and does not generate a downward component, so that a joint portion excellent in depilation prevention performance is obtained. It is done.
- the rolling method of the present invention can adjust the angle of the vertical wall portion by moving the forming annular groove in the tube axis direction, the locking protrusion having a good contact state with the housing. Articles can be provided.
- the vertical wall portion of the locking protrusion rises at an angle of 65 ° or more and 90 ° or less with respect to the outer peripheral surface of the tube, and the hardness of the tube material is 1 .It has a joint structure with a hardness twice or more. Therefore, it is in a surface contact state with respect to a tensile load in the tube axis direction, and is not easily deformed, so that it is excellent in de-pipe prevention.
- a method of forming a vertical wall portion on a formed convex portion using a processing means in which the clearance between the convex roller and the forming annular groove is equal to or greater than the plate thickness of the tube to be processed Illustration to explain The figure explaining the method of forming a latching protrusion using the ring which has a convex roller and the cyclic
- the figure explaining the latching protrusion which has the vertical wall part which stood at the predetermined angle with respect to the outer peripheral surface of a tubular body formed by the rolling method of this invention The figure explaining the extraction prevention effect of the joint part using the latching protrusion formed by the rolling processing method of this invention
- the figure explaining the measurement position of the hardness test in the Example of the present invention The figure explaining the housing type pipe joint structure using a general locking ridge
- the figure explaining the method of forming a latching ridge by a general rolling method The figure explaining the structure which formed the annular groove in the outer peripheral surface of a tubular body
- the figure explaining the structure which welded the annular locking member to the outer peripheral surface of a tubular body The figure explaining the malfunction situation of the joint part using a general locking ridge
- the present inventors have formed a joint portion in which tube ends of tube bodies in which locking ridges are formed on the outer peripheral surface by a rolling method as described in Patent Document 1 are fixed by a housing to supply fluid.
- a rolling method as described in Patent Document 1
- ⁇ nominal diameter ⁇ 3 is required.
- a tensile strength in the pipe axis direction is required.
- the depilation prevention performance can be improved by changing the contact state between the housing and the locking protrusion as shown in FIG. 9 from line contact to surface contact. Therefore, first, a rolling method of a locking ridge having a vertical vertical wall surface rising at an angle of 90 ° with respect to the outer peripheral surface of the tubular body as shown in FIG.
- a tubular body having a cross-sectional locking projection having a vertical wall surface is fixed by covering the housing, and a tensile load in the tube axis direction is applied to the joint, the housing is shown in FIG.
- the contact relationship between the ridges and the locking ridges is in a surface contact state, the surface pressure is low and the deformation of the locking ridges can be suppressed, and the tensile load acts only in the tube axis direction. As a result, it is considered that the high fastening performance between the tubular bodies is exhibited, and the depipe prevention performance is improved.
- the formation of the locking ridges by the rolling method includes a convex roller 10 positioned inside the tube 2 to be processed and an annular groove 12 for forming positioned outside the tube 2 to be processed. Are pressed in directions approaching each other while rotating along the circumferential direction of the tube 2 to be processed.
- the distal end surface 16 and molding the annular groove 12 of the vertical wall surface 16 and R I and a concave roller 11, which is applied to the intersection of the distal end surface 17 and the medial longitudinal convex roller 10 it is necessary that the total value or more convex height 9 of R U granted at the intersection with the wall 18 of.
- the ironing is performed, a large degree of processing is imparted at the deformed portion and work hardening occurs, so that the locking protrusion after processing has high hardness, and deformation against tensile load is suppressed.
- the convex height becomes excessively large the rate of reduction of the plate thickness becomes excessively large and the plate thickness becomes thin, so that the deformation resistance against the tensile load tends to decrease.
- a vertical wall portion that rises inclined with respect to the tube axis direction of the tube body to be processed is formed.
- a method of forming a locking protrusion while applying a pressing force in the tube axis direction is effective. For example, as shown in FIG. 3, after rolling to form a convex portion (overhang portion) 4 ′, as shown in FIG. 4, the forming annular groove 12 is moved in the tube axis direction to By pressing the portion 4 ′ against the convex roller 10, the vertical wall portion 6 can be formed by increasing the angle 19 of the vertical wall portion 6.
- the processing by pressing on the convex roller gives a large degree of processing at the molding site and causes work hardening, so that the locking protrusion after processing has high hardness and prevents the tube from being pulled out against a tensile load. It had excellent characteristics. And such a characteristic is not restricted to the case of the latching protrusion in which the vertical wall part was formed perpendicularly. Even when it has a vertical wall portion formed at an angle of less than 90 °, it has the same high hardness and excellent properties of preventing the tube from being pulled out against a tensile load. Specifically, the locking ridge having the vertical wall portion formed at an angle of 65 ° or more was good.
- the locking ridge has a vertical wall portion extending at an angle of less than 90 °, when a tensile load is applied to the joint portion provided with the locking ridge, the locking ridge is Since it is deformed at a location in contact with the housing and is in a surface contact state with the inner wall of the housing, the surface pressure is reduced, and a good withdrawal preventing property is obtained.
- Convex height 9 of the convex portion is at least necessary that the at least the sum of R I and the R U. However, if the convex height becomes excessively large, the rate of reduction in the plate thickness increases and the plate thickness decreases, so that the deformation resistance against the tensile load tends to decrease.
- a steel pipe As the material tube. Assuming that it is used as a water pipe, one excellent in durability is preferable. As a steel pipe excellent in durability, a plated steel pipe excellent in corrosion resistance is preferable. Among the plated steel pipes, steel pipes with Zn—Al—Mg alloy plating having good corrosion resistance are preferable. If further improvement in corrosion resistance is desired, it is preferable to use a steel pipe made of stainless steel such as SUS304. If such a steel pipe having a thickness of about 3 mm is used, it is possible to obtain a joint part sufficiently clearing the above-mentioned seismic performance of the joint part.
- the present invention can be applied to a fluid feed pipe used for feeding a fluid such as liquid or gas. What is necessary is just the joint part of the pipe
- the convex roller 10 as shown in FIG. 2 has an outer diameter of 80 mm and W I 5.0 mm.
- a rolling roller having a dimension of R I 2.5 mm, and a rolling roller having a diameter of 117 mm, a groove depth of 17 mm, W U 9.0 mm, and R U 2.5 mm as the concave roller 11 were used.
- the clearance between the two was 2.0 mm, which was smaller than the plate thickness. Under these conditions, a locking protrusion having a convex height 9 of about 3.5 to 12.0 mm was formed.
- the clearance between the molding an annular groove in the inner convex roller and the outer concave roller is processed under the condition is at least the thickness of the tube as a convex roller 10 as shown in FIG. 3, the outer diameter of 80 mm, W I A rolling roller having dimensions of 5.0 mm and R I 2.5 mm, and a concave roller 11, a rolling roller having dimensions of an outer diameter of 117 mm, a groove depth of 17 mm, W U of 13.0 mm, and R U of 2.5 mm was used. Further, the rolling process was performed while applying a pressing force in the tube axis direction of the tube body. Both clearances were 4.0 mm larger than the plate thickness.
- Locking ridges having a convex height of about 4.0 mm and convex heights of about 6.0 mm, about 12.0 mm, and about 15.0 mm that are higher than the total value were formed.
- the outer diameter is 110 mm, W I 6.0 mm, R I.
- a rolling roller having dimensions of 0 mm and a rolling roller having dimensions of an outer diameter of 117 mm, a groove depth of 17 mm, W U 10.0 mm, and R U 2.5 mm were used as concave rollers.
- the clearance between the two is 2.0 mm. Under these conditions, a locking protrusion having a convex height of about 4.0 to 18.0 mm was formed.
- the convex roller When processing under conditions where the clearance between the inner convex roller and the outer concave roller is equal to or greater than the thickness of the tube, the convex roller has dimensions of an outer diameter of 110 mm, W I 6.0 mm, and R I 3.0 mm.
- a rolling roller having an outer diameter of 117 mm, a groove depth of 17 mm, W U 18.0 mm, and R U 2.5 mm was used. Further, the rolling process was performed while applying a pressing force in the tube axis direction of the tube body. Both clearances were 6.0 mm larger than the plate thickness.
- a locking ridge was formed on the outer peripheral surface using a SUS304 steel pipe having a nominal diameter of 250 (outer diameter of 267 mm, plate thickness of 4.0 mm) as a tube material.
- the convex roller When processing under conditions where the clearance between the inner convex roller and the outer concave roller is equal to or greater than the thickness of the tube, the convex roller has dimensions of an outer diameter of 110 mm, W I 6.0 mm, and R I 3.0 mm.
- a rolling roller having an outer diameter of 117 mm, a groove depth of 17 mm, W U of 20.0 mm, and R U of 2.5 mm was used. Further, the rolling process was performed while applying a pressing force in the tube axis direction of the tube body. Both clearances were 7.0 mm larger than the plate thickness. In this condition, to form a locking projection having a total value (5.5 mm) protruding height of greater about 9.0mm than the R U of the forming annular grooves of R I and a concave roller convex rollers.
- the cross-sectional shape of the locking ridge obtained in Production Examples 1 to 3 is as shown in FIG.
- the thickness of each portion of the locking ridge was reduced to about 1.8 mm at the base in Test Example 4 in which the convex height of Production Example 1 was about 7.0 mm, for example.
- the thickness reduction rate of the base reached about 40%.
- the cross-sectional shape of the locking ridge obtained in Production Examples 1 to 3 depends on the degree of the convex height. As shown in FIG. 6 (a), a vertical wall portion extending vertically by 90 ° with respect to the tube axis direction is included. Alternatively, as shown in FIG. 6 (b), a vertical wall portion that extends at an angle of 65 ° or more is included.
- the maximum load needs to be more than that.
- ⁇ the maximum load obtained by the measurement
- x the maximum load
- ⁇ Evaluation 2-1> (When the clearance between the inner convex roller and the outer concave roller is smaller than the thickness of the tube to be processed) Test examples using test specimens processed with a clearance between the convex roller and the annular groove for forming the concave roller of about 2.0 mm were manufactured in Test Examples 1 to 6, Test Example 2 in Test Examples 15 to 19, Production Example 3 is Test Examples 23 to 27.
- Test Examples 2 to 5 showed the maximum load greater than the reference load.
- the maximum load was 275 kN.
- the convex height is 3.5 m, so smaller than the sum of the R I and R u (5.0 mm), had lower maximum load.
- Test Example 6 since the convex height was excessively large and the thickness of the base portion was greatly reduced to 50%, the maximum load was reduced.
- Test Examples 16 to 18 showed the maximum load that was equal to or higher than the reference load. For example, contrast, Test Example 15, convex in height of about 4.0 mm, so smaller than the sum of the R I and R u (5.5 mm), had lower maximum load. In Test Example 19, since the convex height was excessively large and the thickness of the base portion was greatly reduced to 54%, the maximum load was reduced.
- Test Examples 24 to 26 were more than the standard load.
- Test Example 23 a convex height of 4.0 mm, so smaller than the sum of the R I and R u (5.5 mm), had lower maximum load.
- Test Example 27 the convex height was excessively large, and the plate thickness of the base portion was greatly reduced to 55%, so that the maximum load was reduced.
- ⁇ Evaluation 2-2> (When the clearance between the inner convex roller and the outer concave roller is greater than the plate thickness of the tube to be processed) As shown in Table 1, in Production Example 1, those processed with the clearance of about 4.0 mm are Test Examples 7 to 14. Among them, test example 7, since the projecting height is less than the sum of the R I and R u (5.0 mm), the maximum load is 230KN, it was less than the reference load. In the test examples in which the convex height is equal to or greater than the total value, Test Examples 9, 10, 12, and 13 in which the angle of the vertical wall portion with respect to the tube axis direction is 70 ° and 90 ° showed the maximum load that is equal to or greater than the reference load.
- Test Example 13 (convex height of about 12.0 mm, angle 90 °) was 255 kN. In contrast, in Test Examples 8 and 11, the angle was 60 °, so the maximum load was less than the reference load. In Test Example 14, the maximum load was reduced because the convex height was excessively large and the thickness of the base portion was greatly reduced to 50%.
- Test Examples 20 to 22 were processed in Production Example 2 with the clearance of about 6.0 mm. Both, the protruding height is the sum (5.5 mm) larger than 8.0mm between R I and R u, 70 ° angle of the vertical wall portion with respect to the tube axis direction, 90 ° in Test Example 21, 22 shows the maximum load more than a reference load. In Test Example 20, since the angle was 60 °, the maximum load was less than the reference load.
- the joint portion produced by the rolling method of the present invention has a high maximum load, the deformation of the locking ridge is suppressed, and the tube has a good tube withdrawal prevention property. . Since most of the tensile load acts in the tube axis direction, it was confirmed that high fastening properties between the tube bodies could be exhibited.
- the locking ridge having a vertical vertical wall extending at 90 ° with respect to the tube axis direction is in contact with the housing in a surface contact state, so that the surface pressure is low and the locking ridge is deformed. could be suppressed.
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- Rigid Pipes And Flexible Pipes (AREA)
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- Flanged Joints, Insulating Joints, And Other Joints (AREA)
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Abstract
Description
これらのハウジング型の管継手としては、図9に示すように、ハウジング型の管継手20において、ハウジング23より管体22が抜け出すことを防止する構造として、管体22の端部の外周面に環状の係止突条21を形成し、当該係止突条21をハウジング23の内周側開口縁24に内側より係合する構造が提案されている(特許文献1)。
このような要求に対して、特許文献1で提案された方法で加工された係止突条は、必ずしも脱管阻止性能に優れているとはいえない。
他方、凸高さを過度に大きく形成すると、係止突条における板厚の減少する割合が大きくなり、板厚が薄くなるので、好ましくない。特に基部において、その傾向が顕著である。そのため、係止突条は、引張荷重に対する変形抵抗が低下し、変形し易くなる。
本発明に係る縦壁部を形成するために、上記凸部の凸高さが、内側に位置する凸ローラの先端に付与されたRIと、外側に位置する成形用環状溝の先端面と内側縦壁面の交差部に付与されたRUとの合計値以上になるように凸部を形成することが必要である。
つまり、係止突条は、前記管体の外側に位置させた成形用環状溝と、内側に位置させた凸ローラの組合せによって形成される。
図1、図2に示すように、内側凸ローラ10は、その先端面15と縦壁面16との交差部において曲率半径RIの湾曲が付与されているものを用いることが好ましい。
前記成形用環状溝12は、その先端面17と内側縦壁面18の交差部において曲率半径Ruが付与されているものを用いることが好ましい。
その過程で本発明に到達したものである。
以下にその詳細を、検討過程を含めて説明する。
そこで、最初に、図6(a)に示すような、管体の外周面に対して90°の角度で立ち上がる垂直な縦壁面を有する係止突条の転造加工方法について検討した。
縦壁面を有する断面形状の係止突条を有する管体の端部に、ハウジングを被せて固定し、その継手部に管軸方向の引張荷重が掛かったとき、図7に示すように、ハウジングと係止突条の間の当接関係は面接触状態となり、面圧が低く係止突条の変形を抑制できるだけでなく、引張荷重は管軸方向にのみに作用する。その結果、管体同士の高い締結性が発揮されて脱管阻止性能が向上すると考えられる。
転造法による係止突条の形成は、図1に示す通り、被加工管体2の内側に位置させた凸ローラ10と、被加工管体2の外側に位置させた成形用環状溝12を、被加工管体2の円周方向に沿って回転させながら互いに接近する方向へ加圧することによりなされる。
上記のしごき加工が施されると、変形部位において大きな加工度が付与され、加工硬化が生じることから、加工後の係止突条は、高い硬度を有し、引張荷重に対する変形が抑制される特性を有していた。ただ、当該凸高さが過度に大きくなると、板厚減少する割合が過度に大きくなり、板厚が薄くなるため、引張荷重に対する変形抵抗が低下する傾向がある。
そして、このような特性は、縦壁部が垂直に形成された係止突条の場合に限られないものである。90°未満の角度で形成された縦壁部を有する場合も、同じように高い硬度を有し、引張荷重に対する管の抜出阻止性に優れる特性を有していた。具体的には、65°以上の角度で形成された縦壁部を有する係止突条が良好であった。
また、90°未満の角度で延びた縦壁部を有する係止突条であっても、その係止突条を備えた継手部に引張荷重が付加されると、当該係止突条は、ハウジングに接触した箇所で変形し、ハウジング内壁と面接触状態になるので、面圧が低下して、良好な抜出阻止性が得られる。
このような鋼管であって板厚3mm程度のものを用いれば、前記した継手部の耐震性能を十分にクリアした継手部を得ることができる。
管体素材として、呼び径80(外径90mm、板厚3mm)のSUS304鋼管を用いて、外周面に係止突条を形成した。
この条件で、凸ローラの先端に付与されたRIと凹ローラの成形用環状溝の先端面と内側縦壁面の交差部に付与されたRUとの合計値(5.0mm)よりも小さな凸高さである約4.0mm、および、合計値以上の凸高さである約6.0mm、約12.0mm、約15.0mmの係止突条を形成した。
管体素材として、呼び径150(外径165mm、板厚3.5mm)のSUS304鋼管を用いて、外周面に係止突条を形成した。
この条件で、凸ローラのRIと凹ローラの成形用環状溝のRUとの合計値(5.5mm)より小さな凸高さである約4.0mm、および、合計値以上の凸高さである約8.0mmの係止突条を形成した。
管体素材として、呼び径250(外径267mm、板厚4.0mm)のSUS304鋼管を用いて、外周面に係止突条を形成した。
この条件で、凸ローラのRIと凹ローラの成形用環状溝のRUとの合計値(5.5mm)よりも大きな約9.0mmの凸高さを有する係止突条を形成した。
形成されたステンレス鋼管の転造加工部を被加工管体の長手方向に切断してその断面を観察した。そして、係止突条の基部の最小板厚と縦壁部の長さを測定した。切断した断面を樹脂に埋め込み、表面を研磨した後、測長顕微鏡によって測定した。また、係止突条の縦壁部が管体の外周面から立ち上がる角度を測定した。レーザー変位計によって、断面形状を測定し、上記外周面から延びた基準線と凸部の外面から延びた直線とが交差する交点における角度を算出した。
このように、管体の板厚よりもクリアランスが小さくなる組合せの転造ローラを用いることにより、外径方向への係止突条の張出しと同時に、側壁部がしごき加工を伴いながら板厚が減少し、垂直に延びた縦壁部を有する係止突条が得られた。
製造例1~3で得られた試験体を用いて、管軸方向の引張試験を行って、継手部の抜出阻止力を測定した。転造加工が行われた係止突条をハウジングで固定し、万能試験機で最大荷重の測定を行った。その測定結果を表1(製造例1)、表2(製造例2)、表3(製造例3)に示す。
前記したとおり、継手部は、管軸方向の引張強度Fとして、F(kN)≧呼び径×3を要求される。例えば、呼び径80の管体における継手部は、耐震性能の基準荷重が240kN以上であるため、最大荷重は、それ以上が必要である。測定で得られた最大荷重が基準荷重以上の場合は、合格(○)とし、基準荷重未満の場合は不合格(×)と判定した。
凸ローラと凹ローラの成形用環状溝とのクリアランスが約2.0mmで加工した試験体を用いた試験例は、製造例1が試験例1~6、製造例2が試験例15~19、製造例3が試験例23~27である。
表1に示すように、製造例1において、上記クリアランス約4.0mmで加工したものは、試験例7~14である。このうち、試験例7は、凸高さがRIとRuとの合計値(5.0mm)より小さかったため、最大荷重が230kNであり、基準荷重未満であった。凸高さが上記合計値以上の試験例では、管軸方向に対する縦壁部の角度が70°、90°の試験例9、10、12、13は、基準荷重以上の最大荷重を示した。例えば、試験例13(凸高さ約12.0mm、角度90°)は、255kNであった。それに対し、試験例8、11は、当該角度が60°であったので、最大荷重が基準荷重未満であった。また、試験例14は、凸高さが過度に大きく、基部の板厚が50%と大きく減少したことから、最大荷重が低下した。
係止突条を形成した試験体を用いて、基部、縦壁部、頂部の各部位における硬度を測定した。切断した試験体を樹脂に埋め込み、切断した断面を研磨した後、マイクロビッカース硬さ試験により、硬度を測定した。管体素材の硬度は152HVであった。その測定結果を表1~3に示す。図8に示すように、位置A、位置Eは基部で測定した結果であり、位置B、位置Dは縦壁部で測定した結果であり、位置Cは頂部で測定した結果である。
2 被加工管体
3 外周面
4 係止突条
4’ 凸部
5 基部
6 縦壁部
7 湾曲部
8 頂部
9 凸高さ
10 凸ローラ
11 凹ローラ
12 成形用環状溝
13 リング
14 ハウジング
15 先端面(凸ローラ)
16 縦壁面(凸ローラ)
17 先端面(成形用環状溝)
18 内側縦壁面(成形用環状溝)
19a 角度
19b 基準線
19c 直線
20 管継手
21 係止突条
22 管体
23 ハウジング
24 内周側開口縁
25 内側転造ローラ
26 成形突条
27 外側転造ローラ
28 成形用環状溝
29 環状溝
30 係止部材
31 溶接部
Claims (8)
- 被加工管体の外周面に対し、縦壁部を有する係止突条を形成する流体送給管の継手部の転造加工方法であって、
前記係止突条は、前記外周面から延びた湾曲状の基部と、前記基部から延びた前記縦壁部と、前記縦壁部から延びた湾曲部と、前記湾曲部から延びた頂部とを含み、
前記係止突条を、前記管体の内側および外側に位置させた加工手段により形成し、
前記縦壁部を、管軸方向の前記外周面に対して65°以上90°以下の角度で立ち上がるように形成し、
前記係止突条の前記外周面から前記頂部の突端までの高さが、前記管体と当接する前記内側および外側に位置させた加工手段の面の曲率半径の合計値以上に形成する、流体送給管の継手部の転造加工方法。 - 前記加工手段は、前記管体の内側に位置させた凸ローラと、前記管体の外側に位置させた成形用環状溝とを含む、請求項1に記載の流体送給管の継手部の転造加工方法。
- 前記加工手段は、前記凸ローラと前記成形用環状溝とのクリアランスを前記管体の板厚より小さくしたものであり、
当該加工手段により前記管体を加工し、前記縦壁部が前記外周面に対して垂直に延びた前記係止突条を形成する、請求項2に記載の流体送給管の継手部の転造加工方法。 - 前記加工手段は、前記凸ローラと前記成形用環状溝とのクリアランスを前記管体の板厚以上にしたものであり、
当該加工手段により前記管体を加工して前記外周面に凸部を形成し、その後、前記成形用環状溝を前記管体の管軸方向に移動させることにより、前記凸部を前記凸ローラに押付けて、前記係止突条を形成する、請求項2に記載の流体送給管の継手部の転造加工方法。 - 前記凸ローラは、その先端面と縦壁面の交差部において曲率半径RIの湾曲が付与されているものを用いる、請求項2~4のいずれかに記載の流体送給管の継手部の転造加工方法。
- 前記成形用環状溝は、その先端面と内側縦壁面との交差部において曲率半径Ruの湾曲が付与されているものを用いる、請求項2~5のいずれかに記載の流体送給管の継手部の転造加工方法。
- 前記管体に対して管軸方向に押圧力を付与しながら前記係止突条を形成する、請求項2~6のいずれかに記載の流体送給管の継手部の転造加工方法。
- 管体の外周面に係止突条が形成された継手部を備える流体送給管であって、
前記係止突条は、前記管体の塑性変形により形成されており、前記外周面から延びた湾曲状の基部と、前記基部から延びた縦壁部と、前記縦壁部から延びた湾曲部と、前記湾曲部から延びた頂部とを含み、
前記縦壁部は、前記外周面に対して65°以上90°以下の角度で立ち上がっていて、管体素材の硬度の1.2倍以上の硬度を有する、流体送給管。
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CN201480062311.9A CN105980081B (zh) | 2013-11-18 | 2014-11-17 | 流体输送管的接头部的滚轧加工方法 |
MX2016006327A MX2016006327A (es) | 2013-11-18 | 2014-11-17 | Metodo de laminado de forma para porcion de union de tuberia de suministro de fluido y tuberia de suministro de fluido. |
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US15/036,933 US9623467B2 (en) | 2013-11-18 | 2014-11-17 | Form rolling method for joint portion of fluid supply pipe and fluid supply pipe |
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- 2014-11-17 RU RU2016122016D patent/RU2016122016A/ru unknown
- 2014-11-17 CN CN201480062311.9A patent/CN105980081B/zh not_active Expired - Fee Related
- 2014-11-17 RU RU2016122016A patent/RU2650022C1/ru active
- 2014-11-17 KR KR1020167015586A patent/KR101670210B1/ko active IP Right Grant
- 2014-11-17 WO PCT/JP2014/080379 patent/WO2015072571A1/ja active Application Filing
- 2014-11-17 EP EP14862470.3A patent/EP3072605B1/en active Active
- 2014-11-17 CN CN201710278931.1A patent/CN107081361B/zh not_active Expired - Fee Related
- 2014-11-17 MX MX2016006327A patent/MX2016006327A/es unknown
- 2014-11-17 RU RU2017133975A patent/RU2754034C2/ru active
- 2014-11-17 US US15/036,933 patent/US9623467B2/en active Active
- 2014-11-17 EP EP17181459.3A patent/EP3266530A1/en not_active Withdrawn
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WO2016194736A1 (ja) * | 2015-05-29 | 2016-12-08 | 日新製鋼株式会社 | 流体送給管 |
JP2016223532A (ja) * | 2015-05-29 | 2016-12-28 | 日新製鋼株式会社 | 流体送給管 |
JPWO2016194736A1 (ja) * | 2015-05-29 | 2017-06-22 | 日新製鋼株式会社 | 流体送給管 |
Also Published As
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KR20160075803A (ko) | 2016-06-29 |
RU2017133975A (ru) | 2019-02-08 |
CN105980081B (zh) | 2017-07-21 |
PH12016500870A1 (en) | 2016-07-04 |
RU2754034C2 (ru) | 2021-08-25 |
RU2016122016A (ru) | 2017-12-25 |
US20160288187A1 (en) | 2016-10-06 |
KR101670210B1 (ko) | 2016-10-27 |
CN105980081A (zh) | 2016-09-28 |
RU2650022C1 (ru) | 2018-04-06 |
JP5727663B1 (ja) | 2015-06-03 |
US9623467B2 (en) | 2017-04-18 |
JP2015116610A (ja) | 2015-06-25 |
RU2017133975A3 (ja) | 2020-06-30 |
MX2016006327A (es) | 2016-10-05 |
CN107081361B (zh) | 2019-06-07 |
EP3072605A4 (en) | 2017-01-04 |
EP3072605B1 (en) | 2020-01-08 |
EP3072605A1 (en) | 2016-09-28 |
CN107081361A (zh) | 2017-08-22 |
EP3266530A1 (en) | 2018-01-10 |
PH12016500870B1 (en) | 2016-07-04 |
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