Composite molded body and pressurized container with integrated composite molded body

Abstract

To ensure the sealing of a joint between a metal insert member and a resin molded body.SOLUTION: A composite molded body 10 is formed by integrating a metal insert member 11 having a cylindrical outer surface and a resin molded body 12 formed from thermoplastic resin. The insert member 11 and the resin molded body 12 are integrated by insert injection molding. The resin injected during insert injection molding covers at least a portion of the outer peripheral surface of the insert member 11, specifically an annular region CF, so as to adhere closely to the resin. The annular region CF is provided with a conical tapered surface 14 and an annular groove 15, with the annular groove 15 positioned on the larger diameter side of the tapered surface 14.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a composite body in which a metal member and a resin member are integrated by insert injection molding. The present invention also relates to a pressure vessel in which a composite body is integrated.

Background Art

[0002] In a cooling system or the like used in an automobile or the like, a circulation system for circulating a refrigerant may be provided. At that time, the refrigerant may be circulated in a pressurized environment. In that case, a pressure vessel may be provided in the refrigerant circulation path in order to absorb volume changes such as expansion and contraction due to the heat of the refrigerant. The pressure vessel is required to withstand the pressure of the pressurized refrigerant and to seal so as not to leak the refrigerant contained therein.

[0003] The pressure vessel is formed of metal or resin according to the required characteristics. For example, a portion such as a nipple provided in the pressure vessel is constituted by a metal insert member, and the container body of the pressure vessel is constituted by resin, and the two are integrated by so-called insert injection molding. Here, when the metal insert member and the resin container body are integrated by insert injection molding, the sealing property deteriorates at the interface where the insert member and the resin contact, and gas and liquid easily leak from that portion.

[0004] In order to improve the bonding property and sealing property in the insert injection molding of a metal insert member and a resin member (for example, a container body), a technique of performing laser processing on the surface of the metal insert member and then performing insert injection molding is known. For example, Patent Document 1 describes a method for manufacturing a composite member in which laser processing is performed on the surface of a metal insert member to form a plurality of recesses having a specific shape on the surface of the insert member and the surface is bonded to resin. According to the method for manufacturing the composite member, it is disclosed that a composite member having excellent bonding strength and airtightness can be obtained.

Prior Art Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-57584 [Overview of the project] [Problems that the invention aims to solve]

[0006] In pressurized containers, if there are defects in the seal at the joint between the metal insert and the resin container body, pressurization may be insufficient or refrigerant may leak out. Therefore, reliable sealing at this joint is required. In particular, when pressurized containers are used and exposed to high or low temperatures, the expansion / contraction of the resin due to temperature changes is greater than that of the metal, often making sealing difficult. In such applications, reliable sealing is especially important.

[0007] The objective of the present invention is to ensure more reliable sealing at the joint between a metal insert member and a resin molded body. [Means for solving the problem]

[0008] As a result of diligent research, the inventors discovered that adopting a combination of a tapered surface and an annular groove in the shape of the joint between the metal insert member and the resin molded body improves sealing performance, and thus completed the present invention.

[0009] The present invention A method for manufacturing a composite molded body, wherein the composite molded body isA composite molded body comprising a metal insert member having a cylindrical outer surface and a resin molded body made of thermoplastic resin, wherein the insert member and the resin molded body are integrated by insert injection molding, and at least a portion of the outer surface of the insert member, an annular region, is covered by the resin injected during insert injection molding so as to be in close contact with the resin, and the annular region is provided with a conical tapered surface and an annular groove, with the annular groove positioned on the larger diameter side of the tapered surface. The manufacturing method includes an insert injection molding step, in which the insert member is placed inside an injection molding die, the injection molding die is closed and resin is injected to form the resin molded body, integrating the resin molded body with the insert member, and the injected resin is brought into close contact with the tapered surface and the annular groove to seal the space between the insert member and the resin molded body. This is the first invention.

[0010] Furthermore, the present invention relates to a method for manufacturing a composite molded article, wherein the composite molded article is A composite molded body comprising a metal insert member having a cylindrical outer surface and a resin molded body made of thermoplastic resin, wherein the insert member and the resin molded body are integrated by insert injection molding, and at least a portion of the outer surface of the insert member, an annular region, is covered by the resin injected during insert injection molding so as to be in close contact with the resin, and the annular region is provided with a conical tapered surface and an annular groove, with the annular groove positioned on the larger diameter side of the tapered surface. The manufacturing method includes a molded body preparation step for molding a resin molded body and an insert injection molding step, wherein in the insert injection molding step, the resin molded body obtained in the molded body preparation step and the insert member are placed inside an injection molding die, the injection molding die is closed, and resin is injected into the gap between the insert member and the resin molded body to cover the annular region of the outer surface of the insert member with the injected resin, integrate the injected resin with the resin molded body, integrate the resin molded body with the insert member, and seal the gap between the insert member and the resin molded body by making the injected resin adhere closely to the tapered surface and the annular groove. (Second Invention) 。 [Effects of the Invention]

[0011] This invention Method for manufacturing composite molded articles (First invention, Second invention) According to this, the sealing performance of the joint between the metal insert member and the resin molded body can be made more reliable.

[0012] moreover 、 When a hollow tubular insert member is used, it is possible to transmit pressure or send fluid through the through-hole while ensuring reliable sealing. 。 [Brief explanation of the drawing]

[0013] [Figure 1]It is a cross-sectional view showing the configuration of a pressurized container in which the composite body of the first embodiment is integrated. [Figure 2] It is a partial cross-sectional view showing the configuration of the composite body of the first embodiment. [Figure 3] It is a schematic view showing the action when the composite body of the first embodiment is exposed to low temperature. [Figure 4] It is a schematic view showing the action when the composite body of the first embodiment is exposed to high temperature. [Figure 5] It is a partial cross-sectional view showing the configuration of the composite body of the second embodiment.

Mode for Carrying Out the Invention

[0014] Hereinafter, with reference to the drawings, embodiments of the invention will be described by taking, as an example, a pressurized container provided in a circulation path for circulating cooling water in a cooling system of an internal combustion engine of an automobile. The invention is not limited to the individual embodiments shown below, and the form can be changed and implemented. For example, as described later, the specific use of the pressurized container may be other uses.

[0015] In FIG. 1, the configuration of a pressurized container 10 in which a composite body 2 of the first embodiment is integrated is shown in a cross-sectional view. The pressurized container 10 is a hollow container in which the composite body 2 and the molded body 3 are integrated. The composite body 2 is configured by integrating a metal insert member 11 and a resin molded body 12. The molded body 3 and the resin molded body 12 are each formed so as to divide the hollow container into two halves, and by joining them by means such as adhesion or welding, a hollow container is formed. The material of the molded body 3 and the joining method with the composite body 2 are not particularly limited, but preferably, the molded body 3 is formed of a thermoplastic resin, and the composite body 2 and the molded body 3 are joined by heat welding.

[0016] The pressurizing container 10 is connected and used, for example, such that a refrigerant can flow in / out through a metal insert member 11 with respect to a circulation path for circulating cooling water. Further, when in use, the pressurizing container 10 is pressurized and used in such a form that the internal space of the container becomes a higher pressure than the outer space.

[0017] Although not essential, in this embodiment, the metal insert member 11 is formed in a hollow tubular shape and provided with a through-hole H. Through this through-hole H, the inside of the pressurizing container 10 and the refrigerant can communicate with each other.

[0018] The resin molded body 12 constituting the composite molded body 2 is formed of a thermoplastic resin. The thermoplastic resin is not particularly limited, but is preferably a resin capable of heat welding, such as a polyamide resin, a polypropylene resin, or a polyethylene resin. Note that the thermoplastic resin is not limited to a pure resin composed of a single resin component, and may be a thermoplastic resin composition containing various compounding materials and other resin components.

[0019] Next, the metal insert member 11 constituting the composite molded body 2 will be described. As shown in FIG. 2, the insert member 11 has a cylindrical outer peripheral surface. It is only necessary that a part of the outer peripheral surface of the insert member is cylindrical. In this embodiment, the entire outer peripheral surface of the insert member 11 is cylindrical. The metal material constituting the insert member 11 is not particularly limited, and examples thereof include metal materials such as aluminum, iron, and brass. The insert member 11 may be subjected to plating treatment.

[0020] The insert member 11 and the resin molded body 12 are integrated by insert injection molding. And, at least a part of the annular region CF of the outer peripheral surface of the insert member 11 is covered with the resin so as to be in close contact with the injected resin by the resin injected during the insert injection molding.

[0021] Although not essential, in this embodiment, a metal insert member 11 is placed inside the injection molding die used to form the resin molded body 12. The die is then closed, and the resin injection molding process is performed. Insert injection molding is carried out so that the resin molded body 12 and the insert member 11 are integrated while the resin molded body 12 is formed, thereby obtaining a composite molded body 2.

[0022] In other words, during insert injection molding, the injected resin fills a portion of the outer surface of the insert member 11 in an annular shape, and then solidifies. The portion covered by the injected resin is the annular region CF of the outer surface of the insert member 11.

[0023] The annular region CF of the metal insert member 11 is provided with a conical tapered surface 14 and an annular groove 15. When the overall shape of the insert member 11 is hollow tubular, although not essential, it is preferable to provide the conical tapered surface 14 and annular groove 15 in the annular region CF while enlarging (increasing the diameter of) the outer wall of the annular region CF compared to the general outer surface of the hollow tube. This enhances the strength and pressure resistance of the insert member 11 itself.

[0024] Furthermore, in the annular region CF of the metal insert member 11, the annular groove 15 is positioned on the larger diameter side of the tapered surface 14. For example, in the embodiment shown in Figure 2, the metal insert member 11 is a hollow tube 13 outside the annular region CF, and within the annular region CF, the diameter of the outer surface gradually increases from a small diameter to a large diameter due to the tapered surface 14, and the annular groove 15 is provided adjacent to the side with the larger diameter. Preferably, the annular groove 15 is provided such that the portion where the cross-section of the groove changes from a large diameter to a small diameter is substantially perpendicular to the central axis m of the cylindrical annular region CF. That is, preferably, the annular groove 15 is provided in the shape of a rectangular groove.

[0025] Furthermore, although not essential, preferably, as in this embodiment, the insert member 11 is a hollow tubular insert member with a through hole H that penetrates the inside of the annular region CF. As in other embodiments described later, the insert member 11 may not have a through hole H.

[0026] Furthermore, although not essential, in this embodiment, the metal insert member 11 is provided so as to penetrate both the inside and outside of the container wall of the pressurizing container 10, and the annular groove 15 is provided on the inside of the pressurizing container relative to the tapered surface 14, i.e., on the side where high pressure is applied.

[0027] The operation and effects of the composite molded body 2 of the above embodiment will now be described. In the composite molded body 2, the annular region CF of the insert member 11 is covered by insert injection molding, and the resin and the insert member are in close contact and sealed. The annular region CF of the insert member 11 is provided with a conical tapered surface 14 and an annular groove 15, and the annular groove 15 is located on the larger diameter side of the tapered surface 14, which makes the sealing of the joint more reliable.

[0028] In conventional technology, for example, when the joint surface between the insert member and the resin molded body is a simple cylindrical shape, when the composite molded body is cooled, the resin molded body contracts and tightens around the metal insert member, thereby improving the sealing performance. However, when the composite molded body is heated (exposed to high temperatures), the resin molded body expands more than the metal insert member, resulting in a weakening of the tightening of the insert member by the resin molded body or the creation of a gap between the resin molded body and the insert member, thus deteriorating the sealing performance.

[0029] In addition, annular grooves were sometimes provided on the joint surface between the insert member and the resin molded body, but annular grooves alone were not sufficient to improve sealing performance in environments where cooling and heating occur.

[0030] In the composite molded body 2 of the above embodiment, a tapered surface 14 and an annular groove 15 are provided in the annular region CF which forms the joint by insert injection molding, and the annular groove 15 is located on the larger diameter side of the tapered surface 14. As described below, the resin and the metal insert are in close contact whether the composite molded body 2 is being cooled or heated, ensuring a reliable seal at the joint.

[0031] First, the cooling process of the composite molded body 2 will be explained with reference to Figure 3. As the composite molded body 2 cools, the resin molded body 12 shrinks more than the metal insert member 11. When the resin molded body 12 shrinks, the portion 12a surrounding the tapered surface 14 shrinks into a ring shape, and this shrinkage causes portion 12a to tighten around the tapered surface 14. This action is represented by a rightward arrow in Figure 3.

[0032] Furthermore, in the resin molded body 12, the portion 12b of the insert member 11 that is inserted into the annular groove 15 is substantially fixed within the annular groove and does not move along the central axis m of the annular region CF. Therefore, when the composite molded body 2 is cooled and the resin molded body shrinks further, reducing the distance between portions 12a and 12b of the resin molded body, portion 12b is fixed inside the annular groove 15, causing portion 12a to shrink as it is pulled towards the annular groove 15. This action is represented by a downward arrow in Figure 3.

[0033] Thus, when the composite molded body 2 is cooled, the resin molded body 12 shrinks more than the insert member 11, resulting in the shrinkage action shown by the rightward and downward arrows in Figure 3. Both of these actions work to improve the adhesion between the tapered surface 14 of the metal insert member 11 and the resin portion 12a covering that portion. Therefore, in the composite molded body 2 of the above embodiment, reliable sealing performance can be obtained even when it is being cooled.

[0034] Next, the heating phase of the composite molded body 2 will be explained with reference to Figure 4. When the composite molded body 2 is heated, the resin molded body 12 expands more than the metal insert member 11. At this time, the portion 12b of the resin molded body 12 that is embedded in the annular groove 15 of the insert member 11 also expands in the direction along the central axis m of the annular region CF. This expansion action is represented by upward and downward arrows in Figure 4.

[0035] This expansion action causes the portion 12b that is inserted into the annular groove 15 to be strongly pressed against the annular groove 15 in the vertical direction as shown in Figure 4. This pressing maintains the seal line on the side of the annular groove 15 when heated, ensuring a reliable seal. Therefore, in the composite molded body 2 of the above embodiment, reliable sealing performance is obtained even when heated.

[0036] Furthermore, when the composite molded body 2 is heated, the temperature of the metal insert member 11 rises first, followed by the temperature of the resin molded body 12. However, the portion 12b between the annular grooves 15 of the metal insert, which heats up first, heats up faster than the rest of the resin molded body 12. As a result, even before the entire resin molded body 12 has expanded / increased in diameter, portion 12b expands and locks within the annular grooves. This locking action suppresses the expansion of the resin molded body and prevents deterioration of sealing performance during heating.

[0037] Furthermore, as portion 12b expands and locks within the annular groove, portion 12b acts as a strong anchor, preventing portion 12a facing the tapered surface 14 from shifting in the direction of extension of the central axis m, thereby suppressing deterioration of sealing performance in the heated surface.

[0038] As described above, in the composite molded body 2, the insert member 11 is provided with a tapered surface 14 and an annular groove 15, with the annular groove 15 located on the larger diameter side of the tapered surface 14. Therefore, reliable sealing performance can be obtained in both heated and cooled surfaces.

[0039] When the inventors conducted airtightness tests on the joint between the insert member and the resin molded body using test pieces, they found that air leaked under pressure in the case of insert members with a cylindrical outer surface or insert members with only an annular groove on a cylinder. On the other hand, as in the above embodiment, when the insert member is combined with a tapered surface 14 and an annular groove 15, a composite molded body 2 was obtained in which air does not leak even under pressure.

[0040] Furthermore, as in the above embodiment, if the insert member 11 is hollow tubular with a through-hole H that penetrates the inside of the annular region CF, the inside and outside of the pressurizing container 10 can be connected through the through-hole, allowing for the addition and removal of refrigerant from the inside, and the detection of the internal pressure. In other words, while ensuring a secure seal, the inside of the pressurizing container can be accessed from the outside of the container through the through-hole.

[0041] Furthermore, as in the above embodiment, if the composite molded body 2, which is an integrated insert member 11 and resin molded body 12, is integrated to form a part of the pressurizing container 10, and the insert member 11 is provided so as to penetrate the inside and outside of the pressurizing container 10, and the annular groove 15 is provided on the inside of the pressurizing container relative to the tapered surface 14, that is, on the side where high pressure is applied, then the high pressure inside the container will bias the insert member 11 toward the outside of the container, and this bias will cause the tapered surface 14 of the insert member to be pressed against the portion 12a of the resin molded body surrounding the tapered surface, thereby making the sealing action of that portion more reliable.

[0042] The invention is not limited to the embodiments described above and can be implemented with various modifications. Other embodiments of the invention will be described below, but in the following description, the focus will be on the parts that differ from the embodiments described above, and detailed descriptions of parts that are similar will be omitted. Furthermore, these embodiments can be implemented by combining or substituting parts of each other.

[0043] Figure 5 is a partial cross-sectional view showing the configuration of the composite molded body 5 of the second embodiment. The composite molded body 5 is the same as in the first embodiment in that the composite molded body 5 is formed by integrating a metal insert member 21 and a resin molded body 23 by insert injection molding, and that a tapered surface 14 and an annular groove 15 are provided in the annular region CF of the outer circumferential surface of the metal insert member 21, with the annular groove 15 located on the larger diameter side of the tapered surface 14.

[0044] In this embodiment, the relationship between the resin molded body 23 and insert injection molding differs from that of the first embodiment. In the first embodiment, a metal insert member 11 was placed inside the injection molding die used for insert injection molding, and insert injection molding was performed in that state, at which point the resin molded body 12 was formed and the resin molded body 12 and the insert member 11 were integrated. On the other hand, in the manufacturing process of the composite molded body 5 of the second embodiment shown in Figure 5, the resin molded body 23 is prepared in advance by injection molding or the like, and the resin molded body 23 and the metal insert member 21 are placed inside an injection molding die for insert injection molding, and molten resin is injected into the gap between the two in an insert injection molding process, covering the annular region CF on the outer surface of the metal insert member 21 with the injected resin, and integrating the injected resin with the resin molded body 23 by welding or the like, and an annular joint portion 22 that joins the metal insert member 21 and the resin molded body 23 is formed by the resin injected in the insert injection molding process, thereby manufacturing the composite molded body 5.

[0045] The relationship between the resin molded body 23 and insert injection molding may be as described in the first embodiment or as described in the second embodiment. In either case, if a tapered surface 14 and an annular groove 15 are provided in the annular region CF of the outer circumferential surface of the metal insert member, and the annular groove 15 is positioned on the larger diameter side of the tapered surface 14, the reliability of the seal will be similarly improved.

[0046] Furthermore, in this embodiment, the entire outer surface of the metal insert member 21 forms an annular region CF covered by the resin injected during insert injection molding. In other words, the shape of the portion of the metal insert member that is different from the annular region CF is not particularly limited.

[0047] Furthermore, in this embodiment, the metal insert member 21 is provided with a through hole that penetrates the insert member 21, and threads are cut on the inner circumferential surface of the through hole. When the composite molded body 5 is used, for example, a bolt-shaped pressure sensor S can be attached using the threads in the through hole, and the pressure sensor S can be used to detect the pressure inside the container. The sensor may also be a temperature sensor or the like.

[0048] Thus, the specific shape of the metal insert member, particularly the shape of the portion exposed to the outside of the resin molded body, is not particularly limited. This portion can, for example, be shaped like a nipple for connecting a tube, or like a male / female pipe fitting for connecting a pipe. Alternatively, as in the second embodiment, the metal insert member 21 may be shaped to serve as a base for mounting a sensor or the like. Furthermore, the metal insert member itself may be a sensor or terminal. In this case, the metal insert member does not necessarily need to have a through hole.

[0049] Furthermore, the metal insert member may be provided with knurled portions, polygonal portions, or gear-shaped portions to prevent rotation when tightening the screw. It is preferable that these portions be covered with resin that has been injection-molded into the insert. In addition, these portions are provided at a distance from the tapered surface and annular groove in the above embodiment.

[0050] Furthermore, while the above description of the embodiments mainly described a configuration in which the portion corresponding to the side surface of the cylindrical or rod-shaped metal insert member is covered by the resin injected during insert injection molding, the end faces of the metal insert member, for example, the upper and lower end faces of a cylindrical metal insert member, may also be covered by the resin injected during insert injection molding. With such a configuration, the strength of the bond between the metal insert member and the resin molded body can be increased. In addition, if a ring-shaped groove is provided on the end face of the metal insert member, and the resin injected during insert injection molding simultaneously tightly adheres the resin and the metal insert member in that groove, the reliability of the seal is further improved, which is preferable.

[0051] Furthermore, in the manufacturing of the composite molded body according to the above embodiment, when the metal insert member is subjected to insert injection molding, surface treatment to improve adhesion between the resin and the metal, or treatment to improve sealing properties, may be applied before the insert injection molding. For example, the surface of the metal insert member may be laser-processed to create irregularities, the surface of the metal insert member may be treated with chemicals to make it rough, or the metal insert member may be treated with a binder to improve adhesion between the metal insert member and the resin injected during insert injection molding.

[0052] Furthermore, although not described in the above embodiment, the composite molded body 2 and the pressurizing container 10 may be provided with a refrigerant (cooling liquid) inlet, mounting brackets, bosses, etc., as needed.

[0053] Furthermore, while the above description of the embodiment explains that a composite molded body, in which a metal insert member and a resin molded body are integrated, is used as an integrated part of a pressurized container, the composite molded body is not limited to use in pressurized containers. For example, the composite molded body can also be used in a container where the internal pressure is reduced. Alternatively, the composite molded body may be used as a partition placed inside the container, rather than as a peripheral wall. Furthermore, the composite molded body may be used as part of a pipeline through which a pressurized fluid flows.

[0054] Furthermore, while the above description of the embodiment described an example in which the composite molded body 2 and the pressurizing container 10 are used in connection with the refrigerant flow path of a cooling system for an automobile's internal combustion engine, the applications of the composite molded body 2 and the pressurizing container 10 are not limited to this. The composite molded body 2 and the pressurizing container 10 of the above embodiment can be used in any application where sealing in a differential pressure environment is required. For example, the composite molded body 2 and the pressurizing container 10 may be used in connection with the refrigerant circulation path of a temperature control system that cools or heats a secondary battery. In particular, even when the system in which it is used involves temperature changes, the composite molded body 2 and the pressurizing container 10 of the above embodiment exhibit excellent sealing properties and are suitable for use.

[0055] Furthermore, a composite molded body in which a metal insert member and a resin molded body are integrated may be used as a piping component. Here, piping components refer to parts used in piping, such as pipe fittings, pipes, tubes, branch pipes, manifolds, and pressure regulating members. The piping component may be a composite molded body in which a metal insert member shaped like a male member of a pipe fitting and a soft resin molded body (for example, a resin tube) are integrated. In this case, the metal insert member is provided with a through hole so as to become part of the piping.

[0056] Furthermore, if the composite molded body is used as a piping member and is a pressurized piping member used in a piping system, it is preferable that the annular region in which the insert member and the resin molded body come into contact is configured such that the annular groove is on the inside of the pressurized piping member relative to the tapered surface. [Industrial applicability]

[0057] The composite molded body and pressurized container of the above embodiment can be used in the refrigerant path of cooling systems for automobiles and the like, and their enhanced sealing properties give them high industrial value. [Explanation of symbols]

[0058] 10 Pressurized container 2 Composite molded body 11 Metal insert member 13 Hollow tube CF Circular Region 14 Tapered surface 15 Annular groove 12 Resin molded body 12a, 12b part 3. Molded body 5 Composite molded body 21 Metal insert member 22 Joint 23 Resin molded body S pressure sensor

Claims

1. A method for manufacturing a composite molded article, The aforementioned composite molded body is A composite molded body is formed by integrating a metal insert member having a cylindrical outer surface with a resin molded body made of thermoplastic resin, The insert member and the resin molded body are integrated by insert injection molding, and at least a portion of the outer surface of the insert member, which is an annular region, is covered by the resin injected during insert injection molding so as to be in close contact with the resin. The aforementioned annular region is provided with a conical tapered surface and an annular groove, An annular groove is located on the larger diameter side of the tapered surface. It is a composite molded body, The aforementioned manufacturing method is The insert member is placed inside the injection molding die, the injection molding die is closed, and resin injection molding is performed to form the resin molded body, while integrating the resin molded body with the insert member. An insert injection molding process in which the injected resin is brought into close contact with the tapered surface and the annular groove to seal the space between the insert member and the resin molded body. including, A method for manufacturing a composite molded article.

2. A method for manufacturing a composite molded article, The aforementioned composite molded body is A composite molded body is formed by integrating a metal insert member having a cylindrical outer surface with a resin molded body made of thermoplastic resin, The insert member and the resin molded body are integrated by insert injection molding, and at least a portion of the outer surface of the insert member, which is an annular region, is covered by the resin injected during insert injection molding so as to be in close contact with the resin. The aforementioned annular region is provided with a conical tapered surface and an annular groove, An annular groove is located on the larger diameter side of the tapered surface. It is a composite molded body, The aforementioned manufacturing method is This process includes a mold preparation step for forming a resin molded body and an insert injection molding step. In the aforementioned insert injection molding process, The resin molded body obtained in the molded body preparation step and the insert member are placed inside the injection molding die. The injection molding die is closed, and resin is injected into the gap between the insert member and the resin molded body, so that the injected resin covers the annular region of the outer surface of the insert member, and the injected resin is integrated with the resin molded body, and the resin molded body is integrated with the insert member, The injected resin is brought into close contact with the tapered surface and the annular groove, thereby sealing the space between the insert member and the resin molded body. A method for manufacturing a composite molded article.

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