Metal flange and resin pipe assembly and method for manufacturing this assembly

Abstract

To provide an assembly component which enables improvement of durability of a resin pipe at a fixing portion between a metal flange and the resin pipe while fixing the metal flange to a predetermined position of the resin pipe without causing misalignment, and to provide a manufacturing method of the assembly component.SOLUTION: A metal flange 2 having irregularities on a surface of an insertion hole 3 is placed at an insert part 13c provided at a cavity body 13a of a mold 12 and a molten resin R injected into a cavity 13 is hardened to mold a resin pipe 5. The metal flange 2 is fitted in a fixing groove 7 which continues over an entire circumferential periphery of an outer peripheral surface of the resin pipe 5. An outer peripheral surface of the fixing groove 7 gets into the irregularities on the surface of the insertion hole 3. A circumferential rib 9a, which contacts with an end surface of the metal flange 2, has a diameter expanding larger than an outer diameter of the resin pipe 5, and continues over the entire circumferential periphery of the outer peripheral surface of the resin pipe 5, is formed in at least one of both longitudinal ends of the resin pipe 5 of the metal flange 2.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an assembly of a metal flange and a resin pipe and a method for manufacturing the assembly. More specifically, the present invention relates to an assembly capable of fixing a metal flange to a resin pipe at a predetermined position without displacement and improving the durability of the resin pipe at the fixing portion between the two, and a method for manufacturing the assembly.

Background Art

[0002] Resin pipes, which are lighter than metal pipes, are used in various applications. For example, a resin pipe is attached to a target device or the like via an externally fitted flange (see, for example, Patent Document 1). Although the flange may be made of resin for weight reduction, it is necessary to use a metal flange to ensure sufficient durability under usage conditions where a relatively large load continuously acts.

[0003] Since a resin pipe is more likely to deform than a metal flange, a gap may occur at the fixing portion between the two over time, and the metal flange may shift from the predetermined position. In addition, excessive stress may be generated in the resin pipe at the fixing portion between the two, making it likely to be damaged. Therefore, there is room for improvement in fixing the metal flange to the resin pipe at a predetermined position without displacement and improving the durability of the resin pipe at the fixing portion between the two.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is to provide an assembly of a metal flange and a resin pipe that can fix the metal flange to the resin pipe in a predetermined position without displacement, while improving the durability of the resin pipe at the fixing portion between the two, and a method for manufacturing this assembly. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides an assembly of a metal flange and a resin pipe in which the metal flange is fitted onto the resin pipe and integrated with it, wherein the metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin pipe, the surface of the insertion hole in the metal flange through which the resin pipe is inserted is formed with irregularities, the outer surface of the fixing groove fits into these irregularities, and at least one of the longitudinal ends of the resin pipe of the metal flange has a circumferential rib that abuts against the end face of the metal flange and is larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe. Furthermore, it has longitudinal ribs that are connected to the circumferential ribs and extend to one side in the longitudinal direction of the resin pipe. It is characterized by the following: Another assembly of a metal flange and a resin pipe according to the present invention is an assembly of a metal flange and a resin pipe in which the metal flange is fitted onto the resin pipe and integrated, wherein the metal flange is fitted into a fixing groove that is continuous around the entire circumference in the circumferential direction of the outer surface of the resin pipe, the surface of the insertion hole in the metal flange through which the resin pipe is inserted is formed with irregularities, the outer surface of the fixing groove fits into these irregularities, and a circumferential rib is formed on at least one side of the longitudinal ends of the resin pipe of the metal flange that abuts against the end face of the metal flange and is larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe, and the irregularities formed on the surface of the insertion hole include a projection that extends from one end to the other of the insertion hole in a direction nonparallel to the circumferential direction of the resin pipe, and the projection prevents the metal flange from rotating around the resin pipe.

[0007] The present invention provides a method for manufacturing an assembly of a metal flange and a resin pipe, in which the metal flange is fitted onto the resin pipe and integrated with it. The method involves forming irregularities on the surface of the insertion hole through which the resin pipe is inserted in the metal flange, arranging the metal flange in an insert portion provided in a cavity body for forming the resin pipe of a mold, and providing a portion connected to the insert portion and expanding in diameter beyond the outer diameter of the cavity body, extending around the entire circumference of the outer surface of the cavity body, at least one of the extending ends of the insert portion in the direction of extension of the cavity body. This forms circumferential ribs, and longitudinal ribs are formed that are connected to the circumferential ribs and extend to one side in the longitudinal direction of the resin pipe.A rib-forming cavity is formed, and with the mold clamped, molten resin is injected into the cavity body and the rib-forming cavity, and the molten resin hardens to form the resin tube, and the metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin tube, and the outer surface of the fixing groove is fitted into the irregularities on the surface of the insertion hole, so that the metal flange abuts against the end face of the metal flange on at least one of the longitudinal ends of the resin tube, and expands in diameter beyond the outer diameter of the resin tube and is continuous around the entire circumference of the outer surface of the resin tube The aforementioned Forming circumferential ribs Along with the circumferential ribs, the longitudinal ribs are connected to the circumferential ribs and extend to one side in the longitudinal direction of the resin pipe. It is characterized by the following: Another method for manufacturing an assembly of a metal flange and a resin pipe according to the present invention is a method for manufacturing an assembly of a metal flange and a resin pipe in which the metal flange is fitted onto the resin pipe and integrated, wherein irregularities are formed on the surface of the insertion hole through which the resin pipe is inserted in the metal flange, the irregularities include projections extending in a direction nonparallel to the circumferential direction of the resin pipe, the metal flange is placed in an insert portion provided in a cavity body for forming the resin pipe of a mold, and at least one of the extending ends of the insert portion of the cavity body is provided with rib-forming knives connected to the insert portion and expanding in diameter beyond the outer diameter of the cavity body, continuing around the entire circumference of the outer circumferential surface of the cavity body. A cavity is formed, and with the mold clamped, molten resin is injected into the cavity body and the rib-forming cavity, and the molten resin hardens to form the resin tube. The metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin tube, and the outer surface of the fixing groove is fitted into the irregularities on the surface of the insertion hole, thereby preventing the metal flange from rotating around the resin tube by the projections. At least one of the longitudinal ends of the metal flange of the resin tube is formed circumferential ribs that abut against the end face of the metal flange and are larger in diameter than the outer diameter of the resin tube, and are continuous around the entire circumference of the outer surface of the resin tube. [Effects of the Invention]

[0008] According to the present invention, the metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin pipe, and the outer surface of the fixing groove fits into the irregularities on the surface of the insertion hole of the metal flange, which is advantageous for fixing the metal flange to the resin pipe in a predetermined position without displacement. Furthermore, at least one side of both ends of the resin pipe in the longitudinal direction of the metal flange is provided, which abuts against the end face of the metal flange, resin pipe Since the diameter is expanded beyond the outer diameter and the structure has circumferential ribs that are continuous around the entire circumference of the outer surface of the resin pipe, the stress generated in the resin pipe at the fixing point between the two is reduced by the circumferential ribs. As a result, this is advantageous in improving the durability of the resin pipe at the fixing point between the two. [Brief explanation of the drawing]

[0009] [Figure 1] This is an explanatory diagram illustrating the usage state of the assembly product of the present invention in a longitudinal cross-sectional view. [Figure 2] This is an explanatory diagram illustrating the assembly shown in Figure 1 in a longitudinal cross-sectional view. [Figure 3] This is a view from arrow A in Figure 2. [Figure 4] This is a view from arrow B in Figure 2. [Figure 5] Figure 2 is a cross-sectional view of CC. [Figure 6] It is an explanatory view that illustrates the metal flange of FIG. 2 in perspective. [Figure 7] It is an explanatory view that illustrates a modified example of the metal flange in perspective. [Figure 8] It is an explanatory view that illustrates another embodiment of the assembly product in a longitudinal sectional view. [Figure 9] It is a view seen from arrow D of FIG. 8. [Figure 10] It is an explanatory view that illustrates a molding apparatus for manufacturing the assembly product. [Figure 11] It is an explanatory view that illustrates one of the molds of FIG. 10 in a plan view. [Figure 12] It is an explanatory view that illustrates a state in which a metal flange is disposed in the insert portion of FIG. 11. [Figure 13] It is an explanatory view that illustrates a state in which molten resin is injected into the cavity after the mold of FIG. 12 is clamped. [Figure 14] It is an explanatory view that illustrates a state in which assist gas is injected into the molten resin of FIG. 13. [Figure 15] It is an explanatory view that illustrates the parting line of the resin tube of FIG. 4. <…>0000085 [Figure 16] It is an explanatory view that illustrates the parting line of the resin tube of FIG. 9.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an assembly product of a metal flange and a resin tube of the present invention and a manufacturing method of this assembly product will be described based on the embodiments shown in the drawings.

[0011] [[ID=4,2]] As illustrated in FIGS. 1 to 5, an embodiment of an assembly product 1 manufactured according to the present invention is such that a metal flange 2 is externally fitted to a resin tube 5 and the two are integrated. In this embodiment, the resin tube 5 is a straight tube having an outer diameter do and an inner diameter di, but may be a bent tube. The outer diameter do is, for example, about 6 mm to 150 mm, and the inner diameter di is, for example, about 4 mm to 146 mm.

[0012] The longitudinal ends of the resin pipe 5 are connected to various devices and joint components. In this embodiment, as illustrated in Figure 1, the other longitudinal end of the resin pipe 5 is an insertion portion 8 that is inserted into the flow path 11a of the target device 11. The sealing material 8d placed in this insertion portion 8 comes into contact with the inner circumferential surface of the flow path 11a, ensuring a seal between the resin pipe 5 and the flow path 11a.

[0013] One end face of the metal flange 2 abuts against the opposing surface of the target device 11, and a fixing bolt 10 that passes through the mounting hole 4 of the metal flange 2 is screwed into the bolt hole of the target device 11. Assembly Item 1 is connected to and fixed to the target device 11.

[0014] The structure of Assembly 1 is described in detail below.

[0015] The metal flange 2 has an insertion hole 3 through which the resin pipe 5 is inserted and a mounting hole 4. Various metals can be used for the material of the metal flange 2, but aluminum or aluminum alloy is preferred for weight reduction. The thickness t of the metal flange 2 is, for example, about 70% to 100% of the outer diameter do of the resin pipe 5.

[0016] As illustrated in Figure 5, the surface of the insertion hole 3 is provided with numerous protrusions 3a, creating an uneven surface. As illustrated in Figure 6, each protrusion 3a extends linearly parallel to the longitudinal direction of the resin pipe 5. It is preferable that each protrusion 3a is arranged at equal intervals in the circumferential direction. The number of protrusions 3a and the amount by which they protrude radially from the insertion hole 3 are determined as appropriate. For example, the number of protrusions 3a is approximately 8 to 32, and their protrusion is approximately a few millimeters.

[0017] As illustrated in Figure 7, the metal flange 2 can be designed so that each projection 3a extends spirally and is inclined with respect to the longitudinal direction of the resin pipe 5. Alternatively, projections 3a can be provided that extend in the circumferential direction of the insertion hole 3. To prevent the metal flange 2 fitted onto the resin pipe 5 from rotating around the resin pipe 5, the surface of the insertion hole 3 only needs to have at least one projection 3a that extends in the longitudinal direction of the resin pipe 5 (a projection 3a that is not parallel to the circumferential direction of the resin pipe 5).

[0018] The resin pipe 5 has a conduit 6 that extends through its longitudinal direction. Various known resins such as nylon resin (66 nylon, etc.), polypropylene, and ABS resin can be used as the resin forming the resin pipe 5. The type (specifications) of resin used for the resin pipe 5 is determined based on the performance required of the resin pipe 5. For example, a resin with excellent durability against fluids flowing through the conduit 6, and durability against external impacts, abrasion, ultraviolet rays, etc., is used.

[0019] In the case of resin pipes 5, which require high pressure resistance, short fibers (such as glass fibers or carbon fibers) are mixed into the resin in a predetermined proportion (for example, 30% to 40% parts by mass per 100 parts by mass of resin) for reinforcement. The size of the short fibers is, for example, about 0.001 mm to 1.0 mm in outer diameter and about 0.01 mm to 10 mm in length.

[0020] The insertion portion 8 has enlarged diameter portions 8b and 8c that are continuous around the entire circumference of the outer surface of the resin pipe 5 and are spaced apart in the longitudinal direction of the resin pipe 5. The space between each of the enlarged diameter portions 8b and 8c is a seal groove 8a that is continuous around the entire circumference of the outer surface of the resin pipe 5. A sealing material 8d made of rubber or elastomer, such as an O-ring, is fitted into the seal groove 8a.

[0021] The bottom of the seal groove 8a can be located on the inner circumference side of the outer diameter do, but in order to ensure the thickness of the circumferential wall of the resin pipe 5, it is preferable to have it located at the same level as the outer diameter do or on the outer circumference side of the outer diameter do. If the bottom of the seal groove 8a is located on the inner circumference side of the outer diameter do, the outer surfaces of the respective enlarged diameter portions 8b and 8c may be at the same position as the outer diameter do, but if the bottom of this groove is located at the same level as the outer diameter do or on the outer circumference side of the outer diameter do, the outer surfaces of the respective enlarged diameter portions 8b and 8c will be located on the outer circumference side of the outer diameter do.

[0022] The resin pipe 5 has a fixing groove 7 that is continuous around its entire circumference on its outer surface. The metal flange 2 is fitted into the fixing groove 7. The bottom of the fixing groove 7 can be located on the inner side of the outer diameter do, but in order to ensure the thickness of the circumferential wall of the resin pipe 5, it is preferable to have it located at the same level as the outer diameter do or on the outer side of the outer diameter do. As illustrated in Figure 5, the outer surface of the fixing groove 7 fits into the irregularities formed on the surface of the insertion hole 3.

[0023] A circumferential rib 9a is provided at a position spaced apart from one of the enlarged diameter sections 8c in the longitudinal direction of the resin pipe 5. This circumferential rib 9a is continuous around the entire circumference of the outer surface of the resin pipe 5. A fixing groove 7 is located between the enlarged diameter section 8c and the circumferential rib 9a.

[0024] Specifically, the metal flange 2 has an annular circumferential rib 9a that protrudes outward from the outer diameter do of the resin pipe 5 on one side of both longitudinal ends of the resin pipe 5. This circumferential rib 9a abuts against the surface of one end face of the metal flange 2 over its entire circumference.

[0025] The effective length L of the circumferential rib 9a (minimum length in the longitudinal direction of the resin pipe 5) is preferably 2 mm or more, and is approximately 2 mm to 20 mm. In addition, the protrusion amount h of the circumferential rib 9a (amount of protrusion from the outer peripheral surface of the outer diameter do toward the outer peripheral side) is preferably 2.0 mm or more, and is, for example, approximately 2.0 mm to 10.0 mm.

[0026] In this embodiment, an enlarged diameter portion 8c is provided on the other side of both longitudinal ends of the resin pipe 5 of the metal flange 2. This enlarged diameter portion 8c protrudes outward from the outer diameter do of the resin pipe 5 and abuts against the surface of the other end face of the metal flange 2, and is continuous with the entire circumference of the outer surface of the resin pipe 5. Therefore, this enlarged diameter portion 8c also functions as a circumferential rib 9a. However, the amount of protrusion of the enlarged diameter portion 8c outward from the outer surface of the outer diameter do is small and is smaller than the protrusion amount h. The circumferential rib 9a only needs to be arranged on at least one side of both longitudinal ends of the resin pipe 5 of the metal flange 2, and a structure can also be made in which the circumferential rib 9a is on only one side.

[0027] As illustrated in Figures 8 and 9, in addition to the circumferential ribs 9a, the design can also include longitudinal ribs 9b that are connected to the circumferential ribs 9a and extend along one longitudinal side of the resin pipe 5. At least three longitudinal ribs 9b are arranged at equal intervals in the circumferential direction of the resin pipe 5. For example, four to twelve longitudinal ribs 9b are arranged at equal intervals in the circumferential direction.

[0028] Each longitudinal rib 9b is set to substantially the same specifications. The length L1 of the longitudinal rib 9b is, for example, about 2.0 mm to 50.0 mm. The amount of protrusion h from the outer diameter do of the longitudinal rib 9b is preferably 2 mm or more, and may be less than or equal to the amount of protrusion h of the circumferential rib 9a. The width W of the longitudinal rib 9b is, for example, about 2.0 mm to 30.0 mm.

[0029] The cross-sectional shape of the longitudinal rib 9b is not limited to a rectangular shape as illustrated in Figure 9, but can also be a semicircular shape, a triangular shape, or other polygonal shapes. Having a cross-sectional shape without corners is advantageous for improving the durability of the longitudinal rib 9b.

[0030] In this embodiment, the vertical rib 9b is approximately triangular in shape when viewed in a longitudinal section, sloping from the outer edge of the circumferential rib 9a toward the outer surface of the resin pipe 5. However, it can also be made into another shape, such as a quadrilateral. To reduce the weight of the assembly 1 while obtaining a reinforcing effect on the resin pipe 5, it is preferable to use a vertical rib 9b that is approximately triangular in shape when viewed in a longitudinal section.

[0031] The following describes an example of the manufacturing procedure for the present invention used to produce Assembly 1.

[0032] A molding apparatus 14, as illustrated in Figure 10, is used to manufacture the assembly 1 illustrated in Figures 8 and 9. This molding apparatus 14 includes a cylinder 14a for injecting molten resin R into a mold 12 (cavity 13) and an assist gas injection unit 14b for injecting assist gas G into the mold 12 (cavity 13).

[0033] In this embodiment, the mold 12 consists of one mold 12a and the other mold 12b, which are assembled together. The molds 12a and 12b are joined and separated at the parting line PL. The mold 12 is not limited to this two-part type, but various known types can be used.

[0034] As illustrated in Figure 11, the mold 12 has a cavity 13 formed therein, and a discharge section for the assist gas G injected into the cavity 13 is also formed therein. More specifically, the mold 12 (12a, 12b) has a cavity body 13a for forming the resin pipe 5, a rib-forming cavity 13b for forming the circumferential ribs 9a and longitudinal ribs 9b, and an insert portion 13c for arranging the metal flange 2. The rib-forming cavity 13b is formed in connection with the insert portion 13c and is larger in diameter than the outer diameter of the cavity body 13a and is continuous around the entire circumference of the outer surface of the cavity body 13a.

[0035] The molten resin R filled in the rib-forming cavity 13b hardens to form circumferential ribs 9a and longitudinal ribs 9b. Therefore, when circumferential ribs 9a are formed on each end face of the metal flange 2, rib-forming cavities 13b are formed on each end face of the cavity body 13a of the insert portion 13c in the extending direction. When circumferential ribs 9a are formed on only one end face of the metal flange 2, rib-forming cavities 13b are formed only on the one end face of the cavity body 13a of the insert portion 13c in the extending direction.

[0036] The surface of the insertion hole 3 of the metal flange 2 is made uneven by providing protrusions 3a. These protrusions 3a can be created by machining or by hand.

[0037] Next, as illustrated in Figure 12, the metal flange 2 is placed in the insert portion 13c, and then the molds 12a and 12b are assembled together to clamp the mold 12. Then, molten resin R is injected from the cylinder 14a to fill the cavity 13 (cavity body 13a and rib-forming cavity 13b) with molten resin R, as illustrated in Figure 13.

[0038] In this embodiment, as illustrated in Figure 14, an assist gas G, such as nitrogen gas, is injected at a predetermined high pressure into the cavity body 13a, which is filled with molten resin R, and is allowed to pass through the cavity body 13a in the direction of its extension. The assist gas G passing through the cavity body 13a causes excess molten resin to be discharged from the cavity body 13a, forming a pipeline 6.

[0039] Subsequently, the molten resin R remaining in the cavity 13 hardens, forming the resin pipe 5. Simultaneously with the formation of the resin pipe 5, the metal flange 2 is fitted into the fixing groove 7 that runs continuously around the entire circumference of the outer surface of the resin pipe 5, and the outer surface of the fixing groove 7 is fitted into the irregularities on the surface of the insertion hole 3. In addition, the aforementioned circumferential ribs 9a and longitudinal ribs 9b are formed on at least one side of both ends of the metal flange 2 in the longitudinal direction of the resin pipe 5.

[0040] In this embodiment, a molding method using assist gas G as an assist material is employed, but other gases, liquids such as water, and solids such as metal spheres and resin spheres can be used as the assist material. The assist gas injection section 14b employs a known and appropriate mechanism depending on the type of assist material.

[0041] Various known molding methods that do not use assist materials can be employed to mold this resin tube 5. For example, the resin tube 5 can be molded by forming a conduit 6 by injecting molten resin R into the cavity 13 with a core extending in the longitudinal direction of the cavity body 13a, and then removing the core.

[0042] When the resin pipe 5 is a straight pipe, various molding methods can be used, but when the resin pipe 5 is not a straight pipe, it is preferable to use a molding method that uses an assist material. This is because using a molding method that uses an assist material makes it easier to mold the bent portion of the resin pipe 5. In the resin pipe 5 of Figure 4, the dashed line PL exemplified in Figure 15 becomes the parting line of the mold 12, and in the resin pipe 5 of Figure 9, the dashed line PL exemplified in Figure 16 becomes the parting line of the mold 12.

[0043] In the assembly 1 of the present invention, the metal flange 2 is fitted into a fixing groove 7 that is continuous around the entire circumference of the outer surface of the resin pipe 5, and the outer surface of the fixing groove 7 fits into the irregularities on the surface of the insertion hole 3, which is advantageous for fixing the metal flange 2 to the resin pipe 5 in a predetermined position without displacement. In the assembly 1 illustrated in Figures 1 to 6, a projection 3a is provided on the surface of the insertion hole 3 to prevent the metal flange 2 from rotating around the resin pipe 5, and the circumferential rib 9a and the enlarged diameter portion 8c prevent the metal flange 2 from shifting in the longitudinal direction of the resin pipe 5.

[0044] When using the metal flange 2 illustrated in Figure 7, the projection 3a provided on the surface of the insertion hole 3 prevents the metal flange 2 from rotating around the resin pipe 5, and also prevents the metal flange 2 from shifting in the longitudinal direction of the resin pipe 5. Therefore, by providing this projection 3a, the load on the circumferential rib 9a and the enlarged diameter portion 8c, which prevent the metal flange 2 from shifting in the longitudinal direction of the resin pipe 5, can be reduced.

[0045] Furthermore, since the structure is such that at least one of the longitudinal ends of the resin pipe 5 on the metal flange 2 is equipped with a circumferential rib 9a integrated with the resin pipe 5, the stress generated in the resin pipe 5 at the fixing portion between the metal flange 2 and the resin pipe 5 is reduced by the circumferential rib 9a. As a result, damage to the resin pipe 5 over time at the fixing portion between the two can be suppressed, which is advantageous in improving the durability of the resin pipe 5 (assembly 1).

[0046] In particular, the service life of the resin pipe 5 tends to be shorter under conditions where the internal pressure of use is 30 MPa or higher, but by applying the present invention, it is possible to extend the service life. An example of a resin pipe 5 with an internal pressure of use of 3.5 MPa or higher (or 30 MPa or higher) is the piping that carries the refrigerant of an air conditioner installed in an automobile.

[0047] By providing the aforementioned longitudinal ribs 9b in addition to the circumferential ribs 9a, it is advantageous to further improve the durability of the resin pipe 5 (assembly 1). Furthermore, connecting the circumferential ribs 9a to both end faces of the metal flange 2 is advantageous for fixing the metal flange 2 to a predetermined position on the resin pipe 5, and is also advantageous for improving the durability of the resin pipe 5 (assembly 1).

[0048] Furthermore, if the resin tube 5 is too rigid, it will be detrimental to suppressing damage over time, so a moderate degree of flexibility is necessary. For this reason, it is desirable to form the resin tube 5 from, for example, nylon 66 and mix in short fibers for reinforcement. [Explanation of Symbols]

[0049] 1 Assembly 2 Metal flanges 3 Insertion hole 3a protrusion 4 mounting holes 5. Resin pipe 6 conduit 7. Fixing groove 8 Insertion part 8a Seal groove 8b, 8c Expanded diameter part 8d sealing material (O-ring) 9a Circumferential ribs 9b Vertical ribs 10 Fixing bolts 11. Target devices 11a Channel 12 (12a, 12b) mold 13 Cavity 13a Cavity Body 13b Rib-forming cavity 13c Insert section 14 Molding equipment 14a Cylinder 14b Assist gas injection section R molten resin G Assist Gas

Claims

1. In an assembly product of a metal flange and a resin pipe, in which the metal flange is fitted onto the resin pipe and integrated into it, The metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin pipe. The surface of the insertion hole in the metal flange through which the resin pipe is inserted is formed with irregularities, and the outer surface of the fixing groove fits into these irregularities. An assembly of a metal flange and a resin pipe, wherein at least one of the longitudinal ends of the resin pipe of the metal flange has a circumferential rib that abuts against the end face of the metal flange and is larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe, and a longitudinal rib that is connected to the circumferential rib and extends to one longitudinal side of the resin pipe.

2. In an assembly product of a metal flange and a resin pipe, in which the metal flange is fitted onto the resin pipe and integrated into it, The metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin pipe. The surface of the insertion hole in the metal flange through which the resin pipe is inserted is formed with irregularities, and the outer surface of the fixing groove fits into these irregularities. An assembly of a metal flange and a resin pipe, wherein at least one of the longitudinal ends of the resin pipe of the metal flange has a circumferential rib that abuts against the end face of the metal flange and is larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe, and the irregularities include a projection that extends from one end to the other of the insertion hole in a direction nonparallel to the circumferential direction of the resin pipe, and the projection prevents the metal flange from rotating around the resin pipe.

3. The assembly of a metal flange and a resin pipe according to claim 1 or 2, wherein the bottom of the fixing groove is located on the outer circumference side of the outer diameter of the resin pipe.

4. The assembly of a metal flange and a resin pipe according to any one of claims 1 to 3, wherein a circumferential rib is formed on the other end of the resin pipe in the longitudinal direction, abutting against the end face of the metal flange, and expanding in diameter beyond the outer diameter of the resin pipe, and continuous around the entire circumference of the outer surface of the resin pipe.

5. In a method for manufacturing an assembly product of a metal flange and a resin pipe, in which the metal flange is fitted onto the resin pipe and integrated with it, The surface of the insertion hole through which the resin pipe is inserted of the metal flange is made uneven, the metal flange is placed in an insert portion provided in the cavity body for forming the resin pipe of the mold, and a rib-forming cavity is formed on at least one end of the insert portion in the extending direction of the cavity body, which is connected to the insert portion and has a diameter larger than the outer diameter of the cavity body, forming a circumferential rib that extends continuously around the entire circumference of the outer surface of the cavity body, and which is connected to the circumferential rib and forms a longitudinal rib that extends to one side in the longitudinal direction of the resin pipe. A method for manufacturing an assembly of a metal flange and a resin pipe, wherein, with the mold clamped, molten resin is injected into the cavity body and the rib-forming cavity, and the molten resin hardens to form the resin pipe, the metal flange is fitted into a fixing groove that is continuous around the entire circumference of the outer surface of the resin pipe, and the outer surface of the fixing groove is inserted into the irregularities on the surface of the insertion hole, thereby forming the circumferential rib on at least one of the longitudinal ends of the resin pipe of the metal flange, which abuts against the end face of the metal flange and is larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe, and the longitudinal rib is connected to the circumferential rib and extends to one longitudinal side of the resin pipe.

6. In a method for manufacturing an assembly product of a metal flange and a resin pipe, in which the metal flange is fitted onto the resin pipe and integrated with it, The surface of the insertion hole through which the resin pipe is inserted of the metal flange is formed with irregularities, the irregularities include projections extending in a direction nonparallel to the circumferential direction of the resin pipe, the metal flange is placed in an insert portion provided in the cavity body for forming the resin pipe of the mold, and a rib-forming cavity is formed on at least one end of the insert portion in the extending direction of the cavity body, connecting to the insert portion and expanding in diameter beyond the outer diameter of the cavity body, and continuous around the entire circumference of the outer circumferential surface of the cavity body. A method for manufacturing an assembly of a metal flange and a resin pipe, wherein, with the mold clamped, molten resin is injected into the cavity body and the rib-forming cavity, and the molten resin hardens to form the resin pipe; the metal flange is fitted into fixing grooves that are continuous around the entire circumference of the outer surface of the resin pipe, and the outer surface of the fixing grooves is inserted into the irregularities on the surface of the insertion hole, thereby preventing the metal flange from rotating around the resin pipe by the projections; and at least one of the longitudinal ends of the metal flange of the resin pipe abuts against the end face of the metal flange and forms circumferential ribs that are larger in diameter than the outer diameter of the resin pipe and continuous around the entire circumference of the outer surface of the resin pipe.

7. The method for manufacturing an assembly of a metal flange and a resin pipe according to claim 5 or 6, wherein the bottom of the fixing groove is located on the outer circumference side of the outer diameter of the resin pipe.

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