Insert-molded article manufacturing method, insert-molding mold, and insert-molded article

Abstract

Provided is a method for manufacturing an insert-molded product, a mold for insert molding, and an insert-molded product, which enable proper assembly of a metal bushing to a resin molded portion. The method for manufacturing an insert-molded product includes: an insert step (step (S1)) of disposing a metal bushing (10) so that an axis (CL1) of a cylindrical portion (11) of the metal bushing (10) is in the closing direction (D1); a closing step (step (S2)) of closing a second mold (200) including a pressing surface (211) that abuts against an end surface (11a) of the metal bushing (10) with the first mold (100) to compress the cylindrical portion (11) along the axis (CL1) and bulge the cylindrical portion (11) toward a cavity (250) formed by the first mold (100) and the second mold (200) around the cylindrical portion (11); and a molding step (step (S3)) of filling the cavity (250) with resin.

Description

Technical Field

[0001] This invention relates to a method for manufacturing insert molded articles, a mold for insert molding, and insert molded articles. Background Technology

[0002] As a technology related to conventional methods for manufacturing insert molded articles, molds for molding inserts, and insert molded articles, for example, Patent Document 1 discloses a method for manufacturing insert molded articles, a mold for molding inserts, and an insert molded article as follows: After placing a bushing made of metal material with deformable portions formed at both ends inside a molding die, the upper die and the lower die are brought close together to flatten the deformable portions, and molding is performed in a state where the flat surface formed by the flattened deformable portions is in close contact with the upper die or the lower die.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-42561 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] However, such methods of manufacturing inserts, insert molding dies, and inserts are sometimes configured such that the outer periphery of the metal bushing is knurled, making it difficult for them to detach from the resin molding section. Furthermore, there is room for further improvement regarding the structure of assembling the metal bushing to the resin molding section.

[0008] The present invention was made in view of the above circumstances, and its object is to provide a method for manufacturing an insert molded article capable of properly assembling a metal bushing into a resin molding part, an insert molding mold, and an insert molded article.

[0009] Technical means for solving problems

[0010] To achieve the above objectives, the insert molding method of the present invention comprises: an insert step, wherein the metal bushing, including a cylindrical portion, is disposed in a first mold such that the axis of the cylindrical portion is along a mold closing direction; a mold closing step, wherein a second mold, including a pressing surface abutting against the end face of the metal bushing, is closed with the first mold to compress the cylindrical portion along the axis and to bulge the cylindrical portion into a cavity formed by the first mold and the second mold surrounding the cylindrical portion; and a molding step, wherein resin is filled into the cavity.

[0011] To achieve the above objectives, the insert molding die of the present invention comprises: a first die, the first die including: a mounting surface, the mounting surface mounting an end face of one side of the metal bushing along the mold closing direction with the axis of the cylindrical portion of the metal bushing including the cylindrical portion along the mold closing direction; and a first cavity forming surface adjacent to the mounting surface; and a second die, the second die including: a pressing surface abutting against the end face of the other side of the metal bushing, and a second cavity forming surface adjacent to the pressing surface, the first cavity forming surface being shallower than the mounting surface, and the second cavity forming surface being shallower than the pressing surface.

[0012] To achieve the above objectives, the insert molding article of the present invention comprises: a metal bushing including a cylindrical portion; and a resin molding portion assembled with the metal bushing, the cylindrical portion having: an end face on one side and another side in the axial direction of the cylindrical portion and a cylindrical portion between the end faces, the cylindrical portion bulging outward in a radial direction from the end faces and biting into the resin molding portion.

[0013] Invention Effects

[0014] The insert molding method, insert molding mold, and insert molding article of the present invention enable the metal bushing to be properly assembled into the resin molding part. Attached Figure Description

[0015] Figure 1 This is a perspective view of the insert molded article according to the embodiment, viewed from above.

[0016] Figure 2 This is a perspective view of the insert molded article according to the embodiment, viewed from below.

[0017] Figure 3 yes Figure 1 Sectional view III-III.

[0018] Figure 4 This is a perspective view showing a metal bushing assembled on an insert molded article according to an embodiment.

[0019] Figure 5 This illustrates the state in which the first mold and the second mold of the insert molding mold according to the embodiment are separated, and the metal bushing is disposed in the first mold. Figure 1 A cross-sectional view corresponding to section III-III.

[0020] Figure 6 This is a perspective view showing the metal bushing support portion of the first mold according to the embodiment.

[0021] Figure 7 This is a perspective view showing the recess of the second mold involved in the embodiment.

[0022] Figure 8 This is a flowchart illustrating a method for manufacturing insert molded articles according to an embodiment.

[0023] Figure 9 This illustrates the state of the insert molding mold according to the embodiment after it has been closed. Figure 1 A cross-sectional view corresponding to section III-III. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments. Furthermore, the constituent elements of the following embodiments include elements that can be easily substituted by those skilled in the art, or elements that are substantially the same.

[0025] [Example]

[0026] Figures 1-3 The insert molded article 1 shown in this embodiment can be, for example, a protector for a wiring harness assembled in a vehicle such as an automobile. Here, the wiring harness, for example, for connecting various devices mounted in the vehicle, bundles together multiple wiring materials used for power supply and signal communication as a collection component, and uses connectors or the like to connect the multiple wiring materials to each device. The wiring material is, for example, an insulated wire with an insulating sheath covering the core wire, wherein the core wire is formed by bundling together multiple conductive metal wires. The wiring material can also be formed by bundling together multiple insulated wires. As the protector of the insert molded article 1, it protects the wiring material inside the vehicle, fixes it to the vehicle, and restricts the wiring path of the wiring material.

[0027] The protector, which is an insert molded article 1, includes a metal bushing 10 and a resin molded part 20, the resin molded part 20 being the main body of the protector to which the metal bushing 10 is assembled. The metal bushing 10 is made of, for example, a conductive metal material and is formed in a generally cylindrical shape around an axis CL1. The metal bushing 10 includes a cylindrical portion 11 (cylindrical portion) formed in a generally cylindrical shape and a flange portion 12 formed at one end of the cylindrical portion 11 in the direction of the axis CL1.

[0028] In the following description, the side of the metal bushing 10 in the direction of the axis CL1 (the flange 12 side) will be described as the lower side, and the other side as the upper side.

[0029] Although not shown, the insert molded article 1, for example, involves contacting the round terminal of the grounding terminal with the upper end face 11a of the cylindrical portion 11 of the metal bushing 10, and contacting the lower surface 10b of the metal bushing 10, which is formed by the lower end face 11b of the cylindrical portion 11 and the lower surface 12b of the flange portion 12, with the vehicle body, etc., by inserting a bolt through the cylindrical portion 11 and fixing it to the vehicle body, etc., together with the grounding terminal. Thus, the grounding terminal is electrically connected to the vehicle body, etc., via the metal bushing 10. The end face 11a of the cylindrical portion 11 and the lower surface 10b of the metal bushing 10 are formed as flat surfaces. Furthermore, the lower surface 10b is continuously formed by the end face 11b of the cylindrical portion 11 and the lower surface 12b of the flange portion 12. Additionally, the upper surface 22 of the resin molded portion 20 surrounding the cylindrical portion 11 is located lower (on one side) than the upper end face 11a of the cylindrical portion 11. Therefore, the grounding terminal reliably abuts against the end face 11a of the metal bushing 10. Furthermore, the resin molding portion 20 is positioned above the upper surface 12a of the flange portion 12. Therefore, the flange portion 12 protrudes from the lower surface 21 of the resin molding portion 20.

[0030] like Figure 3 and Figure 4 As shown, the cylindrical portion 11 of the metal bushing 10 has a lower end face 11b and an upper end face 11a in the direction of the axis CL1, and a cylindrical portion 11k between the end face 11b and the end face 11a. In this embodiment, the cylindrical portion 11k is formed from the cylindrical portion 11 extending from the upper end face 11a to the upper surface 12a of the flange portion 12. The cylindrical portion 11k has a bulge 11k1 that bulges outward radially (in other words, outward in a direction orthogonally intersecting the axis CL1) than the end faces 11a and 11b. That is, the outer surface 11d of the cylindrical portion 11 of the metal bushing 10 before the first mold 100 and the second mold 200 are closed (see reference). Figure 5 The outer edges of the end faces 11a and 11b are formed in a straight line along the axis CL1. The outer surface 11d of the cylindrical portion 11 of the metal bushing 10 assembled to the insert molded article 1 protrudes radially outward from the outer edges of the end faces 11a and 11b. In this embodiment, the bulge 11k1 is formed such that it bulges outward to its maximum at approximately the center of the length along the axis CL1 from the upper surface 12a of the flange portion 12 to the upper end face 11a of the cylindrical portion 11. The bulge 11k1 is engaged with the resin molding portion 20. The bulge 11k1 that bulges outward is formed in an annular shape. The inner surface 11c of the cylindrical portion 11 corresponding to the bulge 11k1 is formed as an annular recess 11c1 that is recessed radially outward.

[0031] The insert molding 1 is formed by embedding a metal bushing 10 into an insert. A resin molding portion 20 is disposed on the outer periphery of the cylindrical portion 11 around the axis CL1, and the metal bushing 10 and the resin molding portion 20 are integrally formed. The upper surface 12a of the flange portion 12 of the metal bushing 10 abuts against the lower surface 21 of the resin molding portion 20. This prevents the metal bushing 10 from falling off in the upward direction.

[0032] like Figure 5 As shown, the insert molding mold 50 for manufacturing the insert molded article 1 has a first mold 100 and a second mold 200. For example, the first mold 100 can be positioned on the lower fixed side of a vertical injection molding apparatus, and the second mold 200 can be positioned on the upper movable side. The first mold 100 and the second mold 200 are brought close together to close, and separated to open. Specifically, the second mold 200 moves from the upper side to the lower side to close as shown in the mold closing direction D1, and moves from the opposite side of the mold closing direction D1, i.e., from the lower side to the upper side, to open.

[0033] The first mold 100 has a first mold body 101 and a metal bushing support portion 110 disposed on the first mold body 101. The upper surface of the first mold body 101 is formed into a flat surface, becoming the first cavity forming surface 101a for forming the cavity 250 described later. The metal bushing support portion 110 supports the metal bushing 10 including the cylindrical portion 11. The metal bushing support portion 110 is disposed on the first cavity forming surface 101a of the first mold body 101.

[0034] Specifically, such as Figure 6 As shown, the metal bushing support portion 110 has a mounting surface 111 on which the lower surface 10b of the metal bushing 10 (i.e., the lower end face of the metal bushing 10) abuts. The mounting surface 111 is the bottom surface of a groove that is recessed in an annular shape from the first cavity forming surface 101a. A support pin 112 formed in a cylindrical shape is formed on the annular inner side of the mounting surface 111. The support pin 112 is inserted into the cylindrical portion 11 from the lower side of the metal bushing 10. The length of the support pin 112 along the mold closing direction D1 is set such that when the metal bushing 10 is disposed in the metal bushing support portion 110, the upper end face 112a of the support pin 112 is located slightly below the upper end face 11a of the cylindrical portion 11. With the metal bushing support portion 110, the movement of the metal bushing 10 in a direction parallel to the first cavity forming surface 101a is restricted. In addition, as Figure 5 As shown, the distance from the first cavity forming surface 101a to the mounting surface 111 (i.e., the depth of the mounting surface 111) is equal to the thickness of the flange portion 12 of the metal bushing 10. In other words, the first cavity forming surface 101a, which is adjacent to the mounting surface 111, is formed to be shallower than the mounting surface 111.

[0035] like Figure 5 As shown, the second mold 200 includes a second mold body 201. The lower surface 201a of the second mold body 201 is formed as a flat surface. The lower surface 201a of the second mold body 201 is the cavity forming surface of the cavity 250 formed by the second mold body 201. A recess 210, which is formed in a generally circular shape, is provided on the lower surface 201a of the second mold body 201.

[0036] like Figure 7 As shown, a pressing surface 211 and a second cavity forming surface 212 are provided at the bottom 210a of the recess 210. The pressing surface 211 is formed into a thin, circular concave shape and is generally flat. The pressing surface 211 abuts against the upper end face 11a of the metal bushing 10 when the first mold 100 and the second mold 200 are closed, as will be described in detail later. On the other hand, the second cavity forming surface 212 is provided on the radially outer side of the pressing surface 211. The second cavity forming surface 212 is provided adjacent to the radially outer side of the pressing surface 211 in an annular flat shape and is shallower than the pressing surface 211.

[0037] The mounting surface 111 and support pin 112 of the metal bushing support portion 110 in the first mold 100, and the pressing surface 211 and second cavity forming surface 212 of the recess 210 in the second mold 200 are concentrically arranged. In other words, the axis CL1 of the metal bushing 10 disposed in the metal bushing support portion 110 is consistent with the axes of the mounting surface 111 and support pin 112 of the metal bushing support portion 110 in the first mold 100, and the pressing surface 211 and second cavity forming surface 212 of the recess 210 in the second mold 200.

[0038] The first mold 100 and the second mold 200 each have a parting surface (not shown). The first mold 100 and the second mold 200 are closed by bringing their parting surfaces into contact with each other. A cavity 250 is formed by closing the first mold 100 and the second mold 200. The cavity 250 is a closed space formed to include the first cavity forming surface 101a of the first mold 100 and the lower surface 201a or the second cavity forming surface 212 of the second mold 200. The cavity 250 is formed around the cylindrical portion 11 of the metal bushing 10 disposed on the metal bushing support portion 110 of the first mold 100 (around the outer periphery of the cylindrical portion 11 of the axis CL1) (see reference). Figure 9 ).

[0039] like Figure 8 As shown, the method for manufacturing an insert molded article 1 using an insert molding mold 50 includes an inserting process (step S1), a mold closing process (step S2), and a molding process (step S3).

[0040] Insertion process (step S1): such as Figure 5As shown, in the insert process (step S1), the insert molding mold 50 is opened, and the metal bushing 10 is positioned on the first mold 100 with the axis CL1 of the cylindrical portion 11 along the mold closing direction D1. Specifically, the metal bushing 10 is positioned on the metal bushing support portion 110 of the first mold 100 with the flange portion 12 facing the first mold 100. At this time, the metal bushing 10 is positioned such that the lower surface 10b of the metal bushing 10, i.e., the lower surface 12b which serves as the lower end face of the flange portion 12, and the lower end face 11b of the cylindrical portion 11, abut against the mounting surface 111. In addition, when the metal bushing 10 is positioned on the metal bushing support portion 110, the support pin 112 is inserted into the cylindrical portion 11 of the metal bushing 10. The outer peripheral surface 12c of the flange portion 12 abuts against the side wall 110c of the metal bushing support portion 110 at the outer periphery of the mounting surface 111.

[0041] Mold closing process (step S2): In the mold closing process (step S2), after the insert process (step S1), the second mold 200 is moved in the mold closing direction D1, as follows. Figure 9 As shown, the first mold 100 and the second mold 200 are closed. Here, the pressing surface 211 of the second mold 200 abuts against the upper end face 11a of the cylindrical portion 11. The inner circumferential surface of the annular connecting step portion 213, which connects the pressing surface 211 to the second cavity forming surface 212, abuts against the outer circumferential surface of the cylindrical portion 11 on the side of the end face 11a. Furthermore, when the first mold 100 and the second mold 200 abut against each parting surface, the cylindrical portion 11 is compressed along the axis CL1 by clamping the metal bushing 10 using the pressing surface 211 and the mounting surface 111. In addition, when the first mold 100 and the second mold 200 abut against each parting surface, the upper end face 112a of the support pin 112 approaches or contacts the pressing surface 211.

[0042] When the cylindrical portion 11 is compressed by pressing with the pressing surface 211, it bulges out toward the cavity 250 formed around the cylindrical portion 11 during the mold closing process (step S2). When the cylindrical portion 11 is compressed, the support pin 112 is inserted into the cylindrical portion 11, thus preventing the cylindrical portion 11 from bulging radially inward. As the cylindrical portion 11 bulges due to compression, a bulge portion 11k1 is formed. The bulge portion 11k1 is formed, for example, by compressing and bending the cylindrical portion 11. At this time, the inner surface 11c of the cylindrical portion 11 of the metal bushing 10 forms an annular recess 11c that is radially recessed outward, corresponding to the radially outward bulge.

[0043] Molding process (step S3): In the molding process (step S3), resin is filled into the cavity 250 formed by closing the insert molding mold 50 in the mold closing process (step S2). When resin is filled into the cavity 250, a resin molding portion 20 is formed on the outer periphery of the cylindrical portion 11. The filled resin is also disposed on the outer periphery of the portion of the cylindrical portion 11 that bulges outward in a radial direction (bulge portion 11k1), so that the bulge portion 11k1 is engaged with the resin molding portion 20.

[0044] After the molding process (step S3) is completed, the second mold 200 is raised to open the first mold 100 and the second mold 200, and the molded insert 1 is taken out from the first mold 100. In this way, by using the insert molding mold 50, the insert 1 can be obtained.

[0045] The above-described method for manufacturing insert molded articles includes: an insert process (step S1), in which the metal bushing 10, which includes a cylindrical portion 11 (cylindrical portion), is disposed on a first mold 100 such that the axis CL1 of the cylindrical portion 11 is aligned with the mold closing direction D1; a mold closing process (step S2), in which a second mold 200, which includes a pressing surface 211 that abuts against the end face 11a of the metal bushing 10, and the first mold 100 are closed to compress the cylindrical portion 11 along the axis CL1, causing the cylindrical portion 11 to bulge into a cavity 250 formed by the first mold 100 and the second mold 200 surrounding the cylindrical portion 11; and a molding process (step S3), in which resin is filled into the cavity 250.

[0046] Therefore, the insert molded article 1 allows the cylindrical portion 11 of the metal bushing 10 to bulge out and engage with the resin molding portion 20, thereby assembling the metal bushing 10 onto the resin molding portion 20. Thus, by utilizing the bulging portion (bulging portion 11k1) that engages with the resin molding portion 20, reliable vertical anti-detachment is achieved for the metal bushing 10. For example, the insert molded article 1 can be used as a protector for a wiring harness mounted on a vehicle, and the metal bushing 10 and the grounding terminal can be fastened to the vehicle body together with bolts. In this case, the insert molded article 1 can also reduce the likelihood of the metal bushing 10 easily detaching from the resin molding portion 20 due to bolt tightening, vibrations during vehicle operation, etc. Thus, according to the insert molded article manufacturing method of this embodiment, the metal bushing 10 can be properly assembled onto the resin molding portion 20.

[0047] That is, according to this embodiment, even if a metal bushing with a known form, such as having a cylindrical portion 11 and a flange portion 12, is used for insert molding assembled into the resin molding portion 20, it is possible to obtain an insert molded article 1 that prevents the metal bushing 10 from falling off the resin molding portion 20. Therefore, it is not necessary to perform additional processing such as knurling on the metal bushing.

[0048] Furthermore, the first mold 100 has a support pin 112 that is inserted into the inner side of the cylindrical portion 11. In the insert process (step S1), the support pin 112 is inserted into the cylindrical portion 11 to place the metal bushing 10 in the first mold 100. As a result, the support pin 112 restricts the cylindrical portion 11 from bulging radially inward when compressed, thus enabling the cylindrical portion 11 to bulge and engage with the resin molding portion 20 more reliably.

[0049] Furthermore, the metal bushing 10 includes a flange portion 12 formed on the outer periphery of the cylindrical portion 11, and the first mold 100 includes a mounting surface 111 that abuts against the end face, i.e., the lower surface 12b, of the flange portion 12. In the mold closing process (step S2), the metal bushing 10 is clamped by the pressing surface 211 and the mounting surface 111, and the cylindrical portion 11 is compressed along the axis CL1. Thus, in the metal bushing 10 provided with the flange portion 12, the cylindrical portion 11 can also be compressed, and a bulge portion 11k1 can be formed.

[0050] Furthermore, the second mold 200 has a second cavity forming surface 212 adjacent to the pressing surface 211 and forming a cavity 250. The second cavity forming surface 212 is formed shallower than the pressing surface 211. In the molding process (step S3), resin is filled into the cavity 250 containing the second cavity forming surface 212. As a result, the upper surface 22 of the resin molding portion 20 is located lower (on one side) than the upper (other side) end face 11a of the cylindrical portion 11 of the metal bushing 10. Therefore, the end face 11a of the metal bushing 10 reliably protrudes from the upper surface 22 of the resin molding portion 20, for example, enabling the grounding terminal to reliably abut against the end face 11a of the metal bushing 10.

[0051] Additionally, the insert molding mold 50 includes: a first mold 100, which includes a mounting surface 111 and a first cavity forming surface 101a adjacent to the mounting surface 111, wherein the mounting surface 111 mounts one side (lower side) of the end face of the metal bushing 10 along the mold closing direction D1 with the axis CL1 of the cylindrical portion 11 of the metal bushing 10 including the cylindrical portion 11; and a second mold 200, which includes a pressing surface 211 that abuts against the other side (upper side) end face 11a of the metal bushing 10 and a second cavity forming surface 212 adjacent to the pressing surface 211, wherein the first cavity forming surface 101a is formed shallower than the mounting surface 111 and the second cavity forming surface 212 is formed shallower than the pressing surface 211. According to the insert molding die 50, the following insert molded article 1 can be manufactured: the cylindrical portion 11 of the metal bushing 10 is compressed and bulged out and bit into the resin molding portion 20, and the metal bushing 10, which functions reliably as a grounding terminal, is properly assembled into the resin molding portion 20.

[0052] Furthermore, the insert molded article 1 includes: a metal bushing 10 comprising a cylindrical portion 11; and a resin molding portion 20 for assembling the metal bushing 10. The cylindrical portion 11 has an end face 11b on one side (lower side) and an end face 11a on the other side (upper side) in the axial direction CL1 of the cylindrical portion 11, and a cylindrical portion 11k between the end faces 11a and 11b. The cylindrical portion 11k bulges radially outward from the end faces 11a and 11b and engages with the resin molding portion 20. Thus, the metal bushing 10 of the insert molded article 1 is properly assembled to the resin molding portion 20 in a manner that prevents it from easily falling off.

[0053] Furthermore, the methods for manufacturing insert molded articles, the molds for insert molding, and the insert molded articles involved in the above embodiments of the present invention are not limited to the above embodiments, and various modifications can be made within the scope of the claims.

[0054] In the above description, the metal bushing 10 is provided with a flange portion 12, but a metal bushing without a flange portion 12 (i.e., only having a cylindrical portion 11) may also be used. In addition, the metal bushing 10 is formed in a generally cylindrical shape in this embodiment, including the cylindrical portion 11, but for example, a generally cylindrical metal bushing formed in a generally square cylindrical shape may also be used.

[0055] The method for manufacturing insert molded articles, the mold for insert molding, and the insert molded articles of this embodiment can be configured by appropriately combining the constituent elements of the embodiments and variations described above.

[0056] Explanation of reference numerals in the attached figures

[0057] 1: Insert molded products

[0058] 10: Metal bushing

[0059] 11: Cylindrical section (tube section)

[0060] 11a: End face

[0061] 11b: End face

[0062] 11k: Cylindrical section

[0063] 12: Flange portion

[0064] 20: Resin Molding Section

[0065] 50: Mold for insert molding

[0066] 100: First mold

[0067] 101a: First cavity forming surface

[0068] 111: Placement Surface

[0069] 112: Support pin

[0070] 112a: End face

[0071] 200: Second mold

[0072] 211: Pressing surface

[0073] 212: Second cavity forming surface

[0074] 250: Cavity

[0075] CL1: Axis

[0076] D1: Mold closing direction

Claims

1. A method for manufacturing an insert molded article, characterized in that, have: In the insert process, the metal bushing, which includes a cylindrical portion, is positioned in the first mold such that the axis of the cylindrical portion along the mold closing direction is arranged in the mold closing direction. In the mold closing process, the second mold, which includes a pressing surface that abuts against the end face of the metal bushing, is closed with the first mold to compress the cylindrical portion along the axis and to cause the cylindrical portion to bulge out into the cavity formed by the first mold and the second mold surrounding the cylindrical portion; as well as In the molding process, resin is filled into the cavity.

2. The method for manufacturing an insert molded article according to claim 1, wherein, The first mold has a support pin inserted into the inner side of the cylindrical portion, and In the insert process, the support pin is inserted into the cylindrical portion and the metal bushing is disposed on the first mold.

3. The method for manufacturing an insert molded article according to claim 1, wherein, The metal bushing includes a flange portion formed on the outer periphery of the cylindrical portion. The first mold includes a mounting surface that abuts against the end face of the flange portion, and In the mold closing process, the pressing surface and the mounting surface are used to clamp the metal bushing and compress the cylindrical portion along the axis.

4. The method for manufacturing an insert molded article according to any one of claims 1 to 3, wherein, The second mold has a second cavity forming surface adjacent to the pressing surface and forming the cavity. The second cavity forming surface is shallower than the pressing surface, and In the molding process, the resin is filled into the cavity containing the second cavity forming surface.

5. A mold for insert molding, characterized in that, have: A first mold, the first mold comprising: a mounting surface, the mounting surface mounting an end face of one side of the metal bushing along the mold closing direction with the axis of the cylindrical portion of the metal bushing including the cylindrical portion along the mold closing direction; and a first cavity forming surface adjacent to the mounting surface; and The second mold includes: a pressing surface that abuts against the end face of the other side of the metal bushing; and a second cavity forming surface adjacent to the pressing surface. The first cavity forming surface is shallower than the mounting surface, and The second cavity forming surface is shallower than the pressing surface.

6. An insert molding article, characterized in that, have: Including the metal bushing of the cylinder; and The resin molding part assembled with the metal bushing The cylindrical portion has: one end face on one side and the other side in the axial direction of the cylindrical portion, and a cylindrical body portion between the end faces, and The cylindrical portion bulges outward radially from the end face and bites into the resin molding portion.

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