Insert molding and its manufacturing method

Abstract

To suppress an occurrence of a molding defect even when a wall thickness of a coating part of a resin part covering a surface of a flat part of a metal component is reduced, thereby stabilizing a dimensional accuracy and strength of the insert molded product, and prevent cold slag of a previous shot from entering a cavity of an injection mold, thereby preventing poor appearance and strength of the insert molded product.SOLUTION: A metal component 1 is shaped including a flat part 3, and a through hole 7 is provided in the flat part 3. A resin component 2 is shaped including a coating part 5 covering a surface E of the flat part 3, and there is a gate trace part B on the surface of the coating part 5. On an opposite side of the gate trace part B, the through hole 7 in the flat part 3 of the metal component 1 is located. The resin component 2 has a filling part H filled into the through hole 7.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an insert-molded product made of a metal part and a resin part. [Background technology]

[0002] BACKGROUND ART In various industrial fields, insert-molded products made of metal parts and resin parts are widely used for the purpose of reducing weight and the like (see, for example, Patent Documents 1 and 2).

[0003] Patent Document 1 is an invention of a disk hub used in a hydrodynamic bearing device. The disk hub 10 is made up of a core metal 13, which is a metal part, and a resin molded portion 14, which is a resin part.

[0004] Patent Document 2 is an invention of a rotor unit for an axial flow fan. The rotor unit is made up of a rotor holder 25 and a rotary shaft 21, which are metal parts, and an impeller 4, which is a resin part. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-130208 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-025087 Summary of the Invention [Problem to be solved by the invention]

[0006] In insert-molded products consisting of a metal part and a resin part such as those disclosed in Patent Documents 1 and 2, the metal part has a disk-shaped flat portion (see, for example, the approximately disk-shaped core metal 13 in Patent Document 1 and the annular upper surface 252 portion of the rotor holder 25 in Patent Document 2), and the resin part has a disk-shaped covering portion that covers the surface of the disk-shaped flat portion (see, for example, the disk portion 10a in Patent Document 1 and the approximately disk-shaped portion of the impeller cup 41 in Patent Document 2).

[0007] In the injection molding die used to manufacture the insert-molded product (see, for example, FIG. 6 of Patent Document 1), the gate is a pin gate, and is positioned so as to face the surface of the disk-shaped flat portion of the metal part (see, for example, gate 24 in FIG. 6(a) of Patent Document 1 and gate mark 443 in FIG. 5 of Patent Document 2).

[0008] In insert-molded products, if the thickness of the disk-shaped covering portion of the resin part covering the surface of the disk-shaped flat part of the metal part is reduced to meet demands for further weight reduction and space saving, for example, if the thickness directly below the gate is smaller than the gate diameter, the resin in the thin resin portion directly below the gate solidifies before the gate solidifies, preventing sufficient dwell pressure from being applied. This can lead to molding defects such as sink marks and voids, and unstable dimensional accuracy and strength. Furthermore, cold slugs from the previous shot can enter the cavity of the injection mold, resulting in poor appearance and strength of the molded product.

[0009] The present invention is directed to an insert-molded product consisting of a metal part having a disk-shaped flat portion and a resin part including a disk-shaped covering portion covering the surface of the flat portion, and aims to suppress molding defects even when the thickness of the disk-shaped covering portion of the resin part covering the surface of the disk-shaped flat portion of the metal part is reduced, thereby stabilizing the dimensional accuracy and strength of the insert-molded product. Another aim of the present invention is to suppress the cold slug of the previous shot from entering the cavity of an injection mold, thereby preventing poor appearance and poor strength of the insert-molded product. [Means for solving the problem]

[0010] The gist of the present invention is as follows. [1] An insert-molded product consisting of a metal part and a resin part, The metal part is The shape includes a disk-like flat portion, The flat plate portion has a through hole or a blind hole, The resin part is The shape includes a disk-shaped covering portion that covers the surface of the flat plate-shaped portion, The surface of the covering portion has a gate trace portion, The through hole or the blind hole provided in the flat plate-like portion of the metal component is located on the opposite side of the gate trace portion, The resin part is A filling portion is filled in the through hole or the blind hole, The distance from the gate trace to the back surface of the flat portion of the metal part, or the distance from the gate trace to the bottom surface of the blind hole, The diameter of the gate trace portion of the resin part is larger than that of the gate trace portion of the resin part. Ku, The distance from the gate trace to the surface of the flat portion of the metal component is: The diameter of the gate trace portion of the resin part is smaller than that of the gate trace portion of the resin part. stomach, Insert molding.

[0011] [ 2 〕 A method for manufacturing an insert molded product consisting of a metal part and a resin part, The metal part is The shape includes a disk-like flat portion, The flat plate portion has a through hole or a blind hole, The resin part is The shape includes a disk-shaped covering portion that covers the surface of the flat plate-shaped portion, The gate of the injection mold is a pin gate, The distance from the pin gate to the back surface of the flat portion of the metal part, or the distance from the pin gate to the bottom surface of the blind hole, The diameter of the pin gate is larger than that of the pin gate. a step of opening the mold and setting the metal part as an insert product in the mold so that the through hole or the blind hole faces the pin gate; a step of closing the mold and injecting a molten molding resin material of the resin part through the pin gate to injection mold the resin part; Including fruit, The distance from the pin gate to the surface of the flat portion of the metal component is: smaller than the diameter of the pin gate; Manufacturing method for insert molding products.

[0012] The "insert molded product" in the present invention is a molded product produced by insert molding, in which a metal part is inserted into an injection mold and a resin is injected around the metal part to integrate the metal part and the resin part.

[0013] The "gate mark" in the present invention refers to the mark of the gate of the injection molding die in an insert molded product, or the portion where the gate mark has been removed by machining or the like. [Effects of the Invention]

[0014] According to the insert-molded product and the manufacturing method of the insert-molded product of the present invention, when a molten resin material is injected from a pin gate facing the surface of a disk-shaped flat plate portion of a metal part and a resin part including a disk-shaped covering portion covering the surface of the flat plate portion is injection-molded to manufacture the insert-molded product, a through hole or a blind hole in the metal part faces the pin gate. The distance from the pin gate to the back surface of the flat plate portion of the metal part or the distance from the pin gate to the bottom surface of the blind hole is greater than the diameter of the pin gate. a distance from a gate mark or a pin gate on the surface of the disk-shaped covering portion to the surface of the flat portion of the metal component is made smaller than a diameter of the gate mark or a diameter of the pin gate; Even if the thickness of the disk-shaped covering portion of the resin part that covers the surface of the disk-shaped flat portion of the metal part is reduced, the thickness of the resin directly below the gate remains thick. This prevents the resin directly below the gate from solidifying before the gate solidifies, allowing for sufficient holding pressure to be applied.

[0015] Therefore, molding defects such as sink marks and voids are less likely to occur, resulting in stable dimensional accuracy and strength of the insert-molded product. Furthermore, the cold slug from the previous shot can be prevented from entering the cavity of the injection mold, preventing poor appearance and strength of the insert-molded product. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view of an insert molding according to an embodiment of the present invention. [Figure 2]2A is a front view of the insert-molded product of FIG. 1, and FIG. 2B is a right side view of the insert-molded product of FIG. 1 in vertical section. [Figure 3] 2A is an enlarged front view of a main part of the insert-molded product of FIG. 1, and FIG. 2B is an enlarged right side vertical cross-sectional view of a main part of the insert-molded product of FIG. [Figure 4] FIG. 2 is a perspective view of a metal part of the insert-molded product of FIG. 1. [Figure 5] FIG. 2 is a longitudinal cross-sectional view showing an outline of an injection mold for molding the insert-molded product of FIG. 1. [Figure 6] FIG. 6 is an enlarged longitudinal sectional view of a main part of the injection molding die of FIG. 5. [Figure 7] FIG. 10 is a perspective view of an insert-molded product according to a first modified example. [Figure 8] 8(a) is a front view of the insert-molded product of FIG. 7, and FIG. 8(b) is a right side view of the insert-molded product of FIG. 7 in vertical section. [Figure 9] 8(a) is an enlarged front view of a main part of the insert-molded product of FIG. 7, and FIG. 8(b) is an enlarged right side vertical cross-sectional view of a main part of the insert-molded product of FIG. [Figure 10] FIG. 8 is a perspective view of a metal part of the insert-molded product of FIG. 7. [Figure 11] FIG. 8 is a longitudinal cross-sectional view showing an outline of an injection mold for molding the insert-molded product of FIG. 7. [Figure 12] FIG. 12 is an enlarged vertical cross-sectional view of a main part of the injection molding die of FIG. [Figure 13] FIG. 10 is a perspective view of an insert-molded product according to a second modified example. [Figure 14] 14(a) is a front view of the insert-molded product of FIG. 13, and FIG. 14(b) is a right side view of the insert-molded product of FIG. 13 in vertical section. [Figure 15] FIG. 10 is a perspective view of an insert-molded product according to a third modified example. [Figure 16] 16(a) is a front view of the insert-molded product of FIG. 15, and FIG. 16(b) is a right side view of the insert-molded product of FIG. 15 in vertical section. [Figure 17] FIG. 16 is a perspective view of a metal part of the insert-molded product of FIG. 15. [Figure 18]FIG. 16 is a longitudinal cross-sectional view showing an outline of an injection mold for molding the insert-molded product of FIG. 15. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] In this specification, a view looking toward the surface of a flat plate-shaped portion of a metal part (for example, Fig. 2(a), Fig. 8(a), Fig. 14(a), Fig. 16(a)) is considered to be a front view.

[0019] <Insert molding> As shown in the perspective view of Fig. 1, the front view of Fig. 2(a) and the right side vertical cross-sectional view of Fig. 2(b), the enlarged front view of a main part of Fig. 3(a) and the enlarged right side vertical cross-sectional view of a main part of Fig. 3(b), and the perspective view of Fig. 4, an insert-molded product A according to an embodiment of the present invention comprises a metal part 1 and a resin part 2. The resin part 2 is molded from, for example, a thermoplastic resin that is highly productive.

[0020] The metal part 1 is made up of a hollow disk 3A which is a disk-shaped flat portion 3, and a cylinder 4A which is a cylindrical portion 4, and the hollow disk 3A has, for example, three through holes 7 formed at equal intervals in the circumferential direction.

[0021] The resin part 2 consists of a disk-shaped covering portion 5 that covers the surface E of the hollow disk 3A, and a covering portion 6 that covers the outer surface of the cylinder 4A, and the surface 5A of the disk-shaped covering portion 5 has a gate trace portion B within a recess 5C that is a gate escape.

[0022] The through-hole 7 provided in the hollow disk 3A of the metal part 1 is located on the opposite side of the gate mark B on the back surface 5B of the disk-shaped covering portion 5 of the resin part 2. The resin part 2 has a filling portion H (see FIG. 3(b)) filled into the through-hole 7. The filling portion H also functions as a rotation stopper between the metal part 1 and the resin part 2.

[0023] As shown in Fig. 2(b), in the insert molded product A, the back surface of the hollow disk 3A and the inner peripheral surface of the cylinder 4A are exposed. Therefore, when setting the metal part 1 in the movable mold 10 (Fig. 5) of the injection mold I in the insert part setting process in the manufacturing method of the insert molded product described later, since the back surface of the hollow disk 3A and the inner peripheral surface of the cylinder 4A contact the movable mold 10, the metal part 1 which is an insert part can be positioned in the axial direction and the radial direction with respect to the movable mold 10.

[0024] As shown in Fig. 2(a) and Fig. 2(b), the inner diameter of the disk-shaped covering part 5 covering the surface of the hollow disk 3A is larger than the inner diameter of the hollow disk 3A, and the inner peripheral side part of the surface of the hollow disk 3A is exposed. Therefore, when the injection mold I is clamped in the injection molding process in the manufacturing method of the insert molded product described later, the inner peripheral side part of the surface of the hollow disk 3A contacts the fixed mold 9 (Fig. 5) and stabilizes.

[0025] The distance J from the gate trace part B shown in Fig. 3(a) and Fig. 3(b) to the surface E of the hollow disk 3A which is the disk-shaped flat part 3 of the metal part 1 is smaller than the diameter D of the gate trace part B of the resin part 2 (J < D). Also, the distance K from the gate trace part B to the back surface F of the hollow disk 3A which is the disk-shaped flat part 3 of the metal part 1 is larger than the diameter D of the gate trace part B of the resin part 2 (K > D). By setting K > D, the resin immediately below the gate will not solidify before the gate solidifies, so sufficient pressure holding can be applied.

[0026] <Manufacturing method of insert molded product> Referring to the injection mold I schematically shown in the longitudinal sectional view of Fig. 5 and the enlarged longitudinal sectional view of the main part of Fig. 6, the manufacturing method of the insert molded product A will be described. The gate of the injection mold I is a pin gate G.

[0027] (Insert part setting process) Open the movable mold 10 of the injection mold I, and set the metal part 1 which is an insert part in the movable mold 10 so that the through hole 7 of the hollow disk 3A faces the pin gate G of the fixed mold 9.

[0028] (Injection molding process) Close the movable mold 10 of the injection mold I for mold clamping, and inject the molten molded resin material M of the resin part 2 from the pin gate G of the fixed mold 9 into the cavity C to perform injection molding of the resin part 2.

[0029] The distance J from the pin gate G shown in FIG. 6 to the surface E of the hollow disk 3A of the metal part 1 is smaller than the diameter D of the pin gate G (J < D). Also, the distance K from the pin gate G to the back surface F of the hollow disk 3A of the metal part 1 is larger than the diameter D of the pin gate G (K > D).

[0030] (Molded product removal process) After cooling the injection mold I to solidify the resin, open the movable mold 10. Thereby, the insert molded product A is automatically separated from the pin gate G, and a gate trace part B (see FIGS. 2(a), FIGS. 3(a) and 3(b)) remains on the insert molded product A. Next, the insert molded product A is taken out by pushing it with an ejector pin (not shown) provided on the movable mold 10.

[0031] <Insert molded product of the first modification example> In the insert molded product A of the first modification example shown in the perspective view of FIG. 7, the front view of FIG. 8(a), the longitudinal sectional right side view of FIG. 8(b), and the enlarged front view of the main part of FIG. 9(a) and the enlarged longitudinal sectional right side view of the main part of FIG. 9(b), the same reference numerals as those in FIGS. 1, FIGS. 2(a) and 2(b), and FIGS. 3(a) and 3(b) indicate the same or corresponding parts or portions. Also, in the metal part 1 shown in the perspective view of FIG. 10, the same reference numerals as those in FIG. 4 indicate the same or corresponding parts.

[0032] In the hollow disk 3A which is the disk-shaped flat plate part 3 of the metal part 1 in the insert molded product A of the first modification example, a blind hole 8 is provided instead of the through hole 7.

[0033] The distance J from the gate trace portion B shown in FIGS. 9(a) and 9(b) to the surface E of the hollow disk 3A, which is the disk-shaped flat portion 3 of the metal part 1, is smaller than the diameter D of the gate trace portion B of the resin part 2 (J < D). Also, the distance L from the gate trace portion B to the bottom surface of the stop hole 8 of the hollow disk 3A, which is the disk-shaped flat portion 3 of the metal part 1, is larger than the diameter D of the gate trace portion B of the resin part 2 (L > D). By setting L > D, the resin directly under the gate will not solidify before the gate solidifies, so sufficient pressure holding can be applied.

[0034] <Manufacturing Method of Insert Molded Product of First Modified Example> Referring to the injection mold I schematically shown in the longitudinal sectional view of FIG. 11 and the enlarged longitudinal sectional view of the main part of FIG. 12, the manufacturing method of the insert molded product A of the first modified example will be described. The gate of the injection mold I is a pin gate G.

[0035] (Insert Part Setting Step) Open the movable mold 10 of the injection mold I, and set the metal part 1, which is the insert part, on the movable mold 10 so that the stop hole 8 of the hollow disk 3A faces the pin gate G of the fixed mold 9.

[0036] (Injection Molding Step) Close and clamp the movable mold 10 of the injection mold I, and inject the molten molding resin material M of the resin part 2 from the pin gate G of the fixed mold 9 into the cavity C to injection mold the resin part 2.

[0037] The distance J from the pin gate G shown in FIG. 12 to the surface E of the hollow disk 3A of the metal part 1 is smaller than the diameter D of the pin gate G (J < D). Also, the distance L from the pin gate G to the bottom surface of the stop hole 8 of the hollow disk 3A of the metal part 1 is larger than the diameter D of the pin gate G (L > D).

[0038] (Molded Product Removal Step) After the injection mold I is cooled to solidify the resin, the movable mold 10 is opened. This automatically separates the insert-molded product A from the pin gate G, leaving behind a gate mark B (see Figure 8(a) and Figures 9(a) and 9(b)) on the insert-molded product A. Next, the insert-molded product A is removed by being pushed out by an ejector pin (not shown) provided on the movable mold 10.

[0039] <Insert molding product of second modified example> In the insert-molded product A of the second modified example shown in the oblique view of Figure 13, the front view of Figure 14(a) and the right side view of the longitudinal section of Figure 14(b), the same symbols as in Figures 1, 2(a) and 2(b) indicate the same or corresponding parts or portions.

[0040] In the insert-molded product A of the second modified example, the shape of the inner surface N of the disk-shaped covering portion 5 is not a circle as in Figures 1, 2(a) and 2(b), but the inner surface N is set back radially outward except around the gate mark portion B and the recess 5C which is the gate escape, thereby reducing the weight of the disk-shaped covering portion 5.

[0041] <Insert molding product of the third modified example> In the insert-molded product A of the third modified example shown in the perspective view of Fig. 15, the front view of Fig. 16(a), and the right side view of the longitudinal section of Fig. 16(b), the same reference numerals as in Fig. 1, Fig. 2(a), and Fig. 2(b) indicate the same or corresponding parts or portions. Also, in the metal part 1 shown in the perspective view of Fig. 17, the same reference numerals as in Fig. 4 indicate the same or corresponding portions.

[0042] The insert-molded product A of the third modified example is a hollow disk. Therefore, the metal part 1 shown in the perspective view of Fig. 17 does not have the cylinder 4A that is the tubular portion 4 as shown in Fig. 4, and the resin part 2 shown in the perspective view of Fig. 15 does not have the covering portion 6 that covers the outer surface of the cylinder 4A as shown in Fig. 1.

[0043] 16(b), the back surface of the hollow disk 3A is exposed in the insert-molded product A. Therefore, when the metal part 1 is set in the movable die 10 (FIG. 18) of the injection molding die I in the insert-item setting step of the manufacturing method for insert-molded products described below, the back surface of the hollow disk 3A abuts against the movable die 10, so that the metal part 1, which is the insert item, can be positioned axially relative to the movable die 10.

[0044] 16(a) and 16(b), the inner diameter of the disk-shaped covering portion 5 covering the surface of the hollow disk 3A is larger than the inner diameter of the hollow disk 3A, and the inner peripheral portion of the surface of the hollow disk 3A is exposed. Therefore, when the injection molding die I is clamped in the injection molding step in the manufacturing method of the insert molded product described later, the inner peripheral portion of the surface of the hollow disk 3A comes into contact with the fixed die 9 (FIG. 18) and becomes stable.

[0045] <Method for manufacturing insert molded product according to third modified example> A method for manufacturing the insert molded product A of the third modified example will be described with reference to the injection molding die I shown in the longitudinal cross section of Fig. 18. The gate of the injection molding die I is a pin gate G.

[0046] (Insert product setting process) The movable die 10 of the injection molding die I is opened, and the metal part 1, which is the insert product, is set in the movable die 10 so that the pin gate G of the fixed die 9 faces the through hole 7 of the hollow disk 3A.

[0047] (injection molding process) The movable die 10 of the injection molding die I is closed and clamped, and the molten molding resin material M of the resin part 2 is injected into the cavity C from the pin gate G of the fixed die 9, thereby injection-molding the resin part 2.

[0048] (molded product removal process) After the injection mold I is cooled to solidify the resin, the movable mold 10 is opened. This causes the insert-molded product A to automatically separate from the pin gate G, leaving a gate mark B (see Figure 16(a)) on the insert-molded product A. Next, the insert-molded product A is removed by being pushed out by an ejector pin (not shown) provided on the movable mold 10.

[0049] <Structure of insert molding according to an embodiment of the present invention> As described above, in the insert-molded product A according to the embodiment of the present invention, which is made up of a metal part 1 and a resin part 2, the metal part 1 has a shape including a disk-shaped flat plate portion 3, and the disk-shaped flat plate portion 3 has a through hole 7 or a blind hole 8. In the insert-molded product A, the resin part 2 has a shape including a disk-shaped covering portion 5 that covers the surface E of the disk-shaped flat plate portion 3, and a gate mark B is formed on the surface 5A of the disk-shaped covering portion 5. The through hole 7 or blind hole 8 formed in the disk-shaped flat plate portion 3 of the metal part 1 is located on the back surface 5B of the disk-shaped covering portion 5 of the resin part 2, opposite the gate mark B, and the resin part 2 has a filling portion H in which the through hole 7 or blind hole 8 is filled.

[0050] <Action and effect> According to the insert-molded product A and the manufacturing method of the insert-molded product A according to the embodiment of the present invention, when the insert-molded product A is manufactured by injection molding the resin part 2 by injecting molten resin material M through the pin gate G facing the surface E of the disk-shaped flat plate portion 3 of the metal part 1, the through hole 7 or blind hole 8 of the metal part 1 faces the pin gate G. Therefore, even if the thickness of the disk-shaped covering portion 5 of the resin part 2 that covers the surface E of the disk-shaped flat plate portion 3 of the metal part 1 is thin, the thickness of the resin directly below the gate remains thick. This prevents the resin directly below the gate from solidifying before the gate solidifies, allowing for sufficient dwell pressure to be applied.

[0051] This reduces the likelihood of molding defects such as sink marks and voids, stabilizing the dimensional accuracy and strength of the insert-molded product A. Furthermore, it is possible to prevent the cold slug from the previous shot from entering the cavity C of the injection molding die I, preventing poor appearance and strength of the insert-molded product A.

[0052] In the above-described embodiments, the disk-shaped flat portion 3 is a hollow disk 3A, and each has a hole in the center. However, the present invention is not limited to such a shape, and the "disk-shaped flat portion" of the present invention also includes a portion without a central hole.

[0053] The above description of the embodiments is given by way of example only and is not intended to be limiting, and various improvements and modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0054] 1. Metal parts 2. Resin parts 3. Disc-shaped plate-like part 3A Hollow disc 4 Cylindrical part 4A Cylinder 5 Disc-shaped covering part 5A surface 5B Back 5C Recess (gate relief) 6 Covering part 7 through holes 8 blind holes 9 Fixed type 10 Movable type A Insert molding B Gate remains C cavity D Diameter of gate trace (diameter of pin gate) E surface F Back G Pin Gate H filling part I Injection mold J Distance from the gate trace to the surface of the flat part of the metal part K: Distance from the gate trace to the back surface of the flat part of the metal part L: Distance from the gate trace to the bottom of the blind hole M Molten molding resin material for resin parts N Inner surface

Claims

1. An insert-molded product consisting of a metal part and a resin part, The metal part is The shape includes a disk-like flat portion, The flat plate portion has a through hole or a blind hole, The resin part is The shape includes a disk-shaped covering portion that covers the surface of the flat plate-shaped portion, The surface of the covering portion has a gate trace portion, The through hole or the blind hole provided in the flat plate-like portion of the metal component is located on the opposite side of the gate trace portion, The resin part is A filling portion is filled in the through hole or the blind hole, The distance from the gate trace to the back surface of the flat portion of the metal part, or the distance from the gate trace to the bottom surface of the blind hole, a diameter greater than the diameter of the gate trace portion of the resin part, The distance from the gate trace to the surface of the flat portion of the metal component is: The diameter of the gate trace portion of the resin part is smaller than the diameter of the gate trace portion of the resin part. Insert molding.

2. A method for manufacturing an insert molded product consisting of a metal part and a resin part, The metal part is The shape includes a disk-like flat portion, The flat plate portion has a through hole or a blind hole, The resin part is The shape includes a disk-shaped covering portion that covers the surface of the flat plate-shaped portion, The gate of the injection mold is a pin gate, The distance from the pin gate to the back surface of the flat portion of the metal part, or the distance from the pin gate to the bottom surface of the blind hole, The diameter of the pin gate is larger than that of the pin gate. a step of opening the mold and setting the metal part as an insert product in the mold so that the through hole or the blind hole faces the pin gate; a step of closing the mold and injecting a molten molding resin material of the resin part through the pin gate to injection mold the resin part; Including, The distance from the pin gate to the surface of the flat portion of the metal component is: smaller than the diameter of the pin gate; Manufacturing method for insert molding products.

Images