Assembly

Abstract

To provide an assembly in which a first molded article and a second molded article can be manufactured and assembled in an identical injection mold in a state where the first molded article and the second molded article are slidable, without deterioration of quality as the assembly.SOLUTION: An assembly 100 includes a first molded article 110 having a shank part 112, and a second molded article 120 having a hole part 121. The first molded article 110 and the second molded article 120 are combined together by a configuration where the shank part 112 and the hole part 121 are mated together in a slidable state. The second molded article 120 has an undercut shape in an injection mold. Each of the first molded article 110 and the second molded article 120 has a shape that permits formation in the identical injection mold 1 and permits mating in the injection mold 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an assembly, and more particularly to an assembly in which multiple molded articles are combined. [Background technology]

[0002] BACKGROUND ART Conventionally, a technique has been proposed for manufacturing an assembly by injection molding two molded articles, a first molded article and a second molded article, and assembling them in the same injection mold (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-35543 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology disclosed in Patent Document 1, the first molded product and the second molded product are injection-molded together while connected together, and then the first molded product and the second molded product are separated into two parts by an ejection operation. Therefore, when the connected first molded product and the second molded product are separated, burrs and the like may occur at the separation point (breakage portion) between the first molded product and the second molded product. As a result, there is a risk of a decrease in the quality of the assembled product in which the first molded product and the second molded product are combined.

[0005] Furthermore, with the current technology, it is not possible to combine the first molded product and the second molded product in the same injection mold in a state where they can slide against each other in the assembled product (finished product).

[0006] The present disclosure is intended to solve such problems, and aims to provide an assembly in which a first molded product and a second molded product can be produced and assembled in the same injection molding mold in a state in which the first molded product and the second molded product can slide against each other without compromising the quality of the assembly. [Means for solving the problem]

[0007] In order to achieve the above object, one embodiment of an assembly according to the present disclosure comprises a first molded product having an axial portion and a second molded product having a hole portion, the first molded product and the second molded product being combined by fitting the axial portion and the hole portion together in a slidable state, the second molded product having an undercut shape in an injection molding die, and each of the first molded product and the second molded product having a shape that can be molded within the same injection molding die and can be combined within the injection molding die. [Effects of the Invention]

[0008] According to the present disclosure, an assembly can be realized in which a first molded product and a second molded product can be produced and assembled in the same injection molding mold in a state in which the first molded product and the second molded product can slide against each other without compromising the quality of the assembly. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an assembly according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of an assembly according to an embodiment. [Figure 3] FIG. 3 is a diagram showing the configuration of an injection molding die according to the embodiment. [Figure 4A] FIG. 4A is a diagram showing an injection molding step of injection molding a first molded product and a second molded product in a manufacturing method of an assembly according to an embodiment. [Figure 4B] FIG. 4B is a diagram showing a first sliding step of sliding the third cavity member and the slide pin in the manufacturing method of the assembly according to the embodiment. [Figure 4C] FIG. 4C is a diagram showing a mold opening step of opening the fixed cavity member and the movable cavity member in the manufacturing method of the assembly according to the embodiment. [Figure 4D]FIG. 4D is a diagram showing an assembly step of combining a first molded product with a second molded product in the manufacturing method of the assembly according to the embodiment. [Figure 4E] FIG. 4E is a diagram showing a removal step of removing the assembly from the injection mold in the manufacturing method of the assembly according to the embodiment. [Figure 5] FIG. 5 is a diagram for explaining the effect of the positioning portion of the first molded product in the assembly according to the embodiment. [Figure 6] FIG. 6 is a diagram showing the configuration of a positioning portion for a first molded product in an assembly according to an embodiment. [Figure 7] FIG. 7 is a cross-sectional view of the injection molding die according to the first modification taken along the XY plane. [Figure 8] FIG. 8 is a cross-sectional view of the injection molding die according to the second modification taken along the XY plane. [Figure 9] FIG. 9 is a cross-sectional view of the injection molding die according to the third modification taken along the XY plane. [Figure 10] FIG. 10 is a perspective view of a first molded product produced by an injection molding die according to the fourth modification. [Figure 11] FIG. 11 is a cross-sectional view showing a part of an injection molding die according to the fourth modification. [Figure 12] FIG. 12 is a diagram showing the configuration of a first molded product produced by an injection molding die of a first modified example relating to Modification 4. As shown in FIG. [Figure 13] FIG. 13 is a cross-sectional view showing a part of an injection molding die of a first modified example related to Modification Example 4. As shown in FIG. [Figure 14] FIG. 14 is a cross-sectional view showing a part of an injection molding die of a second modified example related to the fourth modified example. [Figure 15] FIG. 15 is a cross-sectional view showing a part of an injection molding die according to the fifth modification. [Figure 16] FIG. 16 is a cross-sectional view showing a first modified example of the assembly. [Figure 17] FIG. 17 is a cross-sectional view showing a second modified example of the assembly. [Figure 18] FIG. 18 is a cross-sectional view showing a third modified example of the assembly. DETAILED DESCRIPTION OF THE INVENTION

[0010] Specific embodiments of the present disclosure will be described below with reference to the drawings. Note that the embodiments described below all represent a comprehensive or specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, component placement and connection configurations, steps, and the order of steps shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0011] Note that each figure is a schematic diagram and is not necessarily an exact illustration. Furthermore, in each figure, substantially the same configuration is assigned the same reference numeral, and duplicate explanations are omitted or simplified. Furthermore, in this specification, the terms "up" and "down" do not necessarily refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition. Furthermore, in this specification and drawings, the X-axis, Y-axis, and Z-axis represent the three axes of a three-dimensional Cartesian coordinate system. The X-axis and Y-axis are orthogonal to each other and are both orthogonal to the Z-axis. In this embodiment, the Z-axis direction is the vertical direction.

[0012] (Embodiment) [Assembled product] First, the configuration of an assembly 100 according to an embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the assembly 100 according to the embodiment. FIG. 2 is a cross-sectional view of the assembly 100 according to the embodiment. In FIGS. 1 and 2, (a) shows the state before the first molded product 110 and the second molded product 120 are combined, and (b) shows the state after the first molded product 110 and the second molded product 120 are combined. Note that the second molded product 120 in FIG. 2 shows the state when the second molded product 120 in FIG. 1 is rotated 90 degrees. Also, the sizes of the various parts do not match between FIGS. 1 and 2.

[0013] As shown in FIGS. 1 and 2, the assembly 100 has a first molded product 110 and a second molded product 120. Both the first molded product 110 and the second molded product 120 are resin molded bodies made of a resin material. Specifically, each of the first molded product 110 and the second molded product 120 is an injection molded product formed into a predetermined shape using an injection molding die. The resin material constituting the first molded product 110 and the resin material constituting the second molded product 120 may be the same or different. In this embodiment, the resin material constituting the first molded product 110 and the resin material constituting the second molded product 120 are the same.

[0014] The first molded product 110 has a main body portion 111 and a shaft portion 112. In this embodiment, the first molded product 110 further has a positioning portion 113.

[0015] The main body 111 is a plate-like member. In this embodiment, the main body 111 is a rectangular, flat plate-like member with a constant thickness. The shape of the main body 111 is not limited to a plate. For example, the main body 111 may be a columnar shape such as a cylindrical shape, or may have a complex three-dimensional shape.

[0016] The shaft portion 112 is a protrusion that protrudes from the main body portion 111. The shaft portion 112 protrudes from the end face of the plate-shaped main body portion 111. The shaft portion 112 is columnar. In this embodiment, the shaft portion 112 has a shape that combines a cylinder and a cone. Specifically, the shaft portion 112 has a shape in which a cone of the same diameter as the cylinder is connected to the end face of the cylinder. The diameter of the cylindrical portion of the shaft portion 112 is equal to the plate thickness of the main body portion 111, but is not limited to this. In other words, the diameter of the cylindrical portion of the shaft portion 112 may be larger or smaller than the plate thickness of the main body portion 111.

[0017] The positioning portion 113 is provided on the outer peripheral surface of the main body portion 111. The positioning portion 113 is a convex portion that protrudes from the outer peripheral surface of the main body portion 111 and extends along the longitudinal direction of the main body portion 111. In this embodiment, the positioning portion 113 extends from one end face of the main body portion 111 toward the other end face, to partway along the main body portion 111. The positioning portion 113 has a shape like a cylinder vertically divided into four. However, the shape of the positioning portion 113 is not limited to this shape. The positioning portion 113 has end faces 113a on both sides in the direction in which the positioning portion 113 extends. In this embodiment, the end faces 113a are flat surfaces perpendicular to the direction in which the positioning portion 113 extends.

[0018] The positioning portion 113 thus formed has the function of determining the position of the first molded product 110 so that the position of the first molded product relative to the injection molding die will not shift due to resin contraction after the first molded product 110 is produced using the injection molding die described below. The function of the positioning portion 113 will be described in detail later.

[0019] The second molded product 120 has a hole 121. The hole 121 is a through-hole. In this embodiment, the second molded product 120 has a shape in which the hole 121 is provided in the center of a plate-like member of constant thickness. As an example, the second molded product 120 is a rectangular, elongated plate-like member. The opening shape of the hole 121 is circular. Note that as long as the shaft portion 112 and the hole 121 fit together, the opening shape of the hole 121 does not have to be circular, and the shape of the shaft portion 112 is not limited to a cylinder.

[0020] The assembly 100 can be produced by combining a first molded product 110 and a second molded product 120. Specifically, the shaft portion 112 of the first molded product 110 is inserted into the hole portion 121 of the second molded product 120 and the hole portion 121 of the shaft portion 112 is fitted together to obtain the assembly 100 in which the first molded product 110 and the second molded product 120 are combined. In this embodiment, by inserting the shaft portion 112 into the hole portion 121, the tip portion of the shaft portion 112 penetrates the hole portion 121 and protrudes from the second molded product 120. Note that Figure 1 shows the first molded product 110 and the second molded product 120 combined together so that the longitudinal direction of the second molded product 120 is perpendicular to the longitudinal direction of the end face of the first molded product 110, while Figure 2 shows the first molded product 110 and the second molded product 120 combined together so that the longitudinal direction of the second molded product 120 is parallel to the longitudinal direction of the end face of the first molded product 110.

[0021] As shown in (a) of Figure 2, a tapered surface 121a may be formed in the hole 121 of the second molded product 120. The tapered surface 121a is formed at the opening end of the hole 121 of the second molded product 120 on the first molded product 110 side. The tapered surface 121a is, for example, a C-surface. By forming the tapered surface 121a in the hole 121 in this way, the shaft 112 of the first molded product 110 can be easily inserted into the hole 121 of the second molded product 120, and the first molded product 110 and the second molded product 120 can be easily combined.

[0022] In addition, the opening diameter of the hole 121 of the second molded product 120 is larger than the outer diameter of the shaft portion 112 of the first molded product 110. This allows the shaft portion 112 of the first molded product 110 and the hole portion 121 of the second molded product 120 to be slidably fitted together. In other words, the first molded product 110 and the second molded product 120 are combined by fitting the shaft portion 112 and the hole portion 121 together in a slidable state. The slidable state between the shaft portion 112 and the hole portion 121 means, for example, that the second molded product 120 is rotatable relative to the first molded product 110, as shown by the arrow in FIG. 1(b). In this embodiment, in the assembled product 100 in which the first molded product 110 and the second molded product 120 are combined, the second molded product 120 can rotate around the axis of the shaft portion 112 of the first molded product 110.

[0023] As described above, in the present embodiment, the shaft portion 112 of the first molded product 110 and the hole portion 121 of the second molded product 120 are fitted together in a slidable state, and therefore, in order to prevent the shaft portion 112 of the first molded product 110 from falling out of the hole portion 121 of the second molded product 120 after the first molded product 110 and the second molded product 120 are combined, a protrusion 112a is provided on the shaft portion 112 of the first molded product 110 as a retaining portion. Specifically, when the shaft portion 112 of the first molded product 110 is inserted into the hole portion 121 of the second molded product 120, the protrusion 112a elastically deforms and passes through the hole portion 121, and the protrusion 112a that has passed through the hole portion 121 is engaged so as to catch on the surface of the second molded product 120 on the side opposite to the first molded product 110 side.

[0024] Protrusion 112a protrudes from the side surface of shaft portion 112 in a direction intersecting the axis of shaft portion 112. Protrusion 112a is provided at the tip of shaft portion 112 and protrudes radially outward from shaft portion 112. In this embodiment, protrusion 112a is formed in a flange shape around the entire circumference of the tip of shaft portion 112. In other words, protrusion 112a protrudes radially around the entire circumference of the tip of shaft portion 112.

[0025] The provision of the protrusion 112a on the shaft 112 prevents the shaft 112 of the first molded product 110 from falling out of the hole 121 of the second molded product 120 after the first molded product 110 and the second molded product 120 are combined, preventing the first molded product 110 and the second molded product 120 from coming apart. In other words, the shaft 112 does not easily come out of the hole 121. Thus, the protrusion 112a functions as a disassembly prevention part that prevents the combined first molded product 110 and the second molded product 120 from coming apart. Therefore, the assembled product 100 does not come apart after the first molded product 110 and the second molded product 120 are combined to produce the assembled product 100, resulting in a highly reliable, high-quality assembled product 100. The first molded product 110 and the second molded product 120 may be separated by pulling them with a strong force after they are combined.

[0026] In this embodiment, the protrusion 112a (disassembly prevention portion) is a projection that protrudes from the side surface of the shaft portion 112 in a direction intersecting the axis of the shaft portion 112. This effectively prevents the shaft portion 112 of the first molded product 110 from falling out of the hole 121 of the second molded product 120 after the first molded product 110 and the second molded product 120 are combined.

[0027] 2, as an example, the cross-sectional shape of the protrusion 112a (disassembly prevention portion) has an outer shape of a circular arc. Specifically, the cross-sectional shape of the protrusion 112a is semicircular. This makes it possible to easily insert the shaft portion 112 of the first molded product 110 into the hole 121 of the second molded product 120, even if the protrusion 112a is provided on the shaft portion 112. Therefore, a structure can be obtained in which the shaft portion 112 is easily fitted into the hole 121, and once the shaft portion 112 is fitted into the hole 121, the shaft portion 112 will not fall out of the hole 121.

[0028] The first molded product 110 and the second molded product 120 are combined inside an injection molding die 1, which will be described later. Specifically, inside the injection molding die 1, the first molded product 110 and the second molded product 120 are simultaneously injection molded while separated, and then the first molded product 110 and the second molded product 120 are combined inside the injection molding die 1 using the same injection molding die 1. This makes it possible to obtain an assembly 100 shown in Fig. 1(b).

[0029] At this time, when the second molded product 120 is produced using an injection mold, the second molded product 120 is injection molded so that the hole 121 faces sideways within the injection mold. Therefore, the second molded product 120 has an undercut shape that becomes an undercut portion. Specifically, the hole 121 in the second molded product 120 becomes an undercut portion in the mold opening direction of the injection mold.

[0030] In this way, although the second molded product 120 has an undercut shape, by using an injection molding die 1 described below, the first molded product 110 and the second molded product 120 can be molded inside the same injection molding die 1 and can be combined inside the injection molding die 1. In other words, the first molded product 110 and the second molded product 120 have shapes that can be molded inside the same injection molding die 1 and can be combined inside the injection molding die 1.

[0031] [Injection mold] Next, the configuration of the injection molding die 1 will be described with reference to Fig. 3. Fig. 3 is a diagram showing the configuration of the injection molding die 1 according to the embodiment.

[0032] The injection molding die 1 is a device for producing an assembly 100 in which a first molded product 110 and a second molded product 120 are combined as shown in Figures 1 and 2. The injection molding die 1 is used in an injection molding machine together with a hopper, a screw, etc. In other words, the injection molding die 1 is used as part of the injection molding machine.

[0033] As shown in FIG. 3, the injection molding die 1 has a fixed-side die 2 and a movable-side die 3. The fixed-side die 2 and the movable-side die 3 are each composed of a plurality of members. The members that make up the fixed-side die 2 do not generally move and are fixed in position. On the other hand, the movable-side die 3 includes members that can move in a predetermined direction. In this embodiment, the fixed-side die 2 is an upper die located above the movable-side die 3, and the movable-side die 3 is a lower die located below the fixed-side die 2.

[0034] The injection molding die 1 has a cavity 4 (recess) that forms a space for injection molding the first molded product 110 and the second molded product 120. In this embodiment, the injection molding die 1 has a first cavity 4a for injection molding the first molded product 110 and a second cavity 4b for injection molding the second molded product 120. The first cavity 4a and the second cavity 4b are connected by a runner, but when the first molded product 110 and the second molded product 120 are injection molded, the first molded product 110 and the second molded product 120 are separated by a gate cut of the pin gate to become separate molded products.

[0035] The fixed-side mold 2 has a fixed-side cavity member 10 that constitutes a part of the cavity 4. In this embodiment, the fixed-side cavity member 10 constitutes a part of the first cavity 4a and a part of the second cavity 4b. Therefore, the fixed-side cavity member 10 has an inner surface shape corresponding to the first molded product 110 and an inner surface shape corresponding to the second molded product 120. Specifically, the fixed-side cavity member 10 has inner surface shapes corresponding to the main body portion 111 and the shaft portion 112 of the first molded product 110 as the inner surface shapes corresponding to the first molded product 110. Furthermore, the fixed-side cavity member 10 has inner surface shapes corresponding to the outer peripheral side surface of the second molded product 120 and an inner surface shape corresponding to the hole portion 121 of the second molded product 120 as the inner surface shapes corresponding to the second molded product 120. In this embodiment, the fixed-side cavity member 10 has a protrusion 10a having a shape corresponding to a part of the shape of the hole portion 121 of the second molded product 120. The protrusion 10a has a shape that fits into the first molded product 110 side portion of the hole 121 of the second molded product 120 when the second molded product 120 is produced in the second cavity 4b. Specifically, the outer peripheral surface of the protrusion 10a corresponds to part of the inner surface of the hole 121 of the second molded product 120. A tapered surface is formed on the outer peripheral surface of the protrusion 10a. As a result, a tapered surface 121a (see FIG. 2(a)) is formed in the hole 121 of the second molded product 120 corresponding to the tapered surface of the protrusion 10a. The fixed side cavity member 10 is, for example, a metal block made of a metal material. Note that the protrusion 10a may have a shape that corresponds only to the tapered surface 121a of the hole 121 of the second molded product 120.

[0036] The fixed-side cavity member 10 may be divided into multiple parts. For example, the fixed-side cavity member 10 may be divided into two parts: one having an inner surface shape corresponding to the first molded product 110, and the other having an inner surface shape corresponding to the second molded product 120.

[0037] The fixed-side mold 2 has a fixed-side mold plate 21, and the fixed-side cavity member 10 is attached to this fixed-side mold plate 21. The fixed-side mold 2 also has a structure for introducing resin material into the fixed-side cavity member 10 when injection molding the first molded product 110 and the second molded product 120. Specifically, the fixed-side mold 2 is provided with a runner 5 that forms a flow path from the sprue to the cavity 4. When injection molding the first molded product 110 and the second molded product 120, the resin material flows through the runner 5 and is introduced into the cavity 4. In this embodiment, the runner 5 is provided on the fixed-side cavity member 10 and the fixed-side mold plate 21.

[0038] The fixed-side mold 2 further has a runner stripper 22 provided on the fixed-side mold 2, and a fixed-side mounting plate 23 provided on the runner stripper 22. A locating ring 24 is provided on the fixed-side mounting plate 23, and sprue bushings 25 are provided on the runner stripper 22 and the fixed-side mounting plate 23. The gate system of the injection molding mold 1 in this embodiment is a pin gate system, but is not limited to this.

[0039] The movable mold 3 has a movable cavity member 30 which, together with the fixed cavity member 10, forms the cavity 4. In other words, the cavity 4 is formed by the fixed cavity member 10 and the movable cavity member 30.

[0040] The movable side cavity member 30 is configured to be openable and closable relative to the fixed side cavity member 10. In this embodiment, the movable side cavity member 30 can move in the Z-axis direction. The mating surface between the fixed side mold 2 and the movable side mold 3 is a parting surface 1a (mold opening surface). Specifically, the parting surface 1a is the mating surface between the movable side cavity member 30 and the fixed side cavity member 10. The parting surface 1a is a parting line in the injection molding die 1.

[0041] The movable-side cavity member 30 is divided into multiple parts. In this embodiment, the movable-side cavity member 30 includes a first cavity member 31, a second cavity member 32, and a third cavity member 33. Each of the first cavity member 31, the second cavity member 32, and the third cavity member 33 is, for example, a metal block made of a metal material.

[0042] The first cavity member 31 and the second cavity member 32, together with the fixed-side cavity member 10, constitute the first cavity 4a. In other words, the first cavity member 31 and the second cavity member 32 are cavity members for producing the first molded product 110 by injection molding. Therefore, each of the first cavity member 31 and the second cavity member 32 has an inner surface shape corresponding to the first molded product 110. Specifically, the first cavity member 31 has an inner surface shape corresponding to the main body portion 111 of the first molded product 110 as the inner surface shape corresponding to the first molded product 110. Furthermore, the second cavity member 32 has an inner surface shape corresponding to the shaft portion 112 of the first molded product 110 as the inner surface shape corresponding to the first molded product 110. Note that the second cavity member 32 also has an inner surface shape corresponding to the end face of the main body portion 111 of the first molded product 110.

[0043] The movable-side mold 3 has a movable-side mold plate 71, and the first cavity member 31 is attached to the movable-side mold plate 71. Specifically, the first cavity member 31 is disposed in and fixed to a recess in the movable-side mold plate 71. Therefore, when the fixed-side cavity member 10 and the movable-side cavity member 30 are opened, the first cavity member 31 moves together with the movable-side mold plate 71, but the first cavity member 31 itself does not slide.

[0044] When the fixed mold 2 and the movable mold 3 are opened, the second cavity member 32 moves together with the movable mold plate 71, similar to the first cavity member 31. However, the second cavity member 32 can also move in a direction parallel to the direction in which the fixed cavity member 10 and the movable cavity member 30 open and close (the mold opening direction of the injection molding die 1). In other words, the second cavity member 32 can move relative to the first cavity member 31.

[0045] In this embodiment, the second cavity member 32 can slide in the Z-axis direction, which is the direction in which the fixed-side cavity member 10 and the movable-side cavity member 30 open and close. Specifically, the second cavity member 32 can slide vertically within a through-hole provided in the movable-side mold plate 71. In this way, the second cavity member 32 is a movable-side slide member configured to be able to slide.

[0046] The sliding device that slides the second cavity member 32 may be included in the second cavity member 32, or may be provided separately from the second cavity member 32. In this embodiment, the second cavity member 32 is attached to the movable-side back plate 72 and slides due to the movable-side back plate 72. In other words, the movable-side back plate 72 has a sliding device that slides the second cavity member 32.

[0047] The third cavity member 33 constitutes the second cavity 4b together with the fixed-side cavity member 10. In other words, the third cavity member 33 is a cavity member for producing the second molded product 120 by injection molding. Therefore, the third cavity member 33 has an inner surface shape corresponding to the second molded product 120. Specifically, the third cavity member 33 has, as the inner surface shape corresponding to the second molded product 120, an inner surface shape corresponding to the outer peripheral side surface of the second molded product 120 and an inner surface shape corresponding to the end face of the second molded product 120.

[0048] The third cavity member 33 is configured to be movable in a direction intersecting the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30. In this embodiment, the third cavity member 33 can slide in the Y-axis direction, which is one of the directions perpendicular to the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30. In this manner, the third cavity member 33 is a movable-side slide member configured to be slidable in the movable mold 3. The third cavity member 33 can be slid by an air cylinder 73. The air cylinder 73 has a piston rod 73a, and the third cavity member 33 abuts against the tip of the piston rod 73a. The third cavity member 33 is slid by the piston rod 73a. The air cylinder 73 is fixed to the movable-side mold plate 71 via a bracket 74.

[0049] The movable mold 3 further includes a slide pin 40. The slide pin 40 is configured to be movable in a direction intersecting the opening and closing direction of the fixed cavity member 10 and the movable cavity member 30. In this embodiment, the slide pin 40, like the third cavity member 33, can slide in the Y-axis direction, which is one of the directions perpendicular to the opening and closing direction of the fixed cavity member 10 and the movable cavity member 30. The slide pin 40 slides in the third cavity member 33. Specifically, the slide pin 40 is provided to pass through a through hole 33a provided in the third cavity member 33 and slides within the through hole 33a. The slide pin 40 can slide independently of the third cavity member 33 and can also slide in conjunction with the third cavity member 33.

[0050] Even when the slide pin 40 slides in conjunction with the third cavity member 33, the slide pin 40 can slide integrally with the third cavity member 33 by the same amount as the third cavity member 33, or by an amount different from the third cavity member 33. Furthermore, by using a separate drive source (cylinder) not shown, the slide pin 40 can also slide independently even when the third cavity member 33 is not moving.

[0051] The slide pin 40 has a tip portion 41 having a shape corresponding to the shape of the hole portion 121 of the second molded product 120. The tip portion 41 has a shape that fits into a portion of the hole portion 121 of the second molded product 120 on the opposite side from the first molded product 110 side when the second molded product 120 is injection molded in the second cavity 4b. Specifically, the outer peripheral surface of the tip portion 41 corresponds to part of the inner surface of the hole portion 121 of the second molded product 120. In this embodiment, since the shape of the hole portion 121 is cylindrical, the shape of the tip portion 41 of the slide pin 40 as a whole is cylindrical. The slide pin 40 is supported by a back plate 75 that is arranged on the back surface of the slide pin 40.

[0052] In this way, when the second molded product 120 is produced by injection molding, not only the protrusion 10a of the fixed-side cavity member 10 is inserted into the hole 121 of the second molded product 120 within the injection molding die 1, but also the tip 41 of the slide pin 40. In addition, when the second molded product 120 is produced, the protrusion 10a of the fixed-side cavity member 10 abuts against the tip surface of the tip 41 of the slide pin 40.

[0053] The movable mold 3 further has a slide core 50 that supports the third cavity member 33. The slide core 50 also supports the slide pins 40 and the back plate 75. The third cavity member 33 supported by the slide core 50 slides on the surface of the slide core 50.

[0054] The slide core 50 is configured to be movable in a direction perpendicular to the direction in which the fixed-side cavity member 10 and the movable-side cavity member 30 open and close. In this embodiment, the slide core 50, like the third cavity member 33, can slide in the Y-axis direction, which is one of the directions perpendicular to the direction in which the fixed-side cavity member 10 and the movable-side cavity member 30 open and close. In other words, the slide core 50 is also a slide member that can slide. The slide core 50 slides on the surface of the movable-side mold plate 71. The slide core 50 can also slide by an air cylinder 73.

[0055] By using a separate drive source (cylinder) not shown, the slide core 50 can slide independently of the third cavity member 33 and can also slide in conjunction with the third cavity member 33. Even when the slide core 50 slides in conjunction with the third cavity member 33, the slide core 50 can slide integrally with the third cavity member 33 by the same amount as the third cavity member 33, or by an amount different from the third cavity member 33. Furthermore, the slide core 50 can slide independently even when the third cavity member 33 is not moving.

[0056] The slide core 50 is, for example, a metal block made of a metal material. The slide core 50 is locked by a locking block 76. The locking block 76 is provided on the fixed-side mold 2. When the slide core 50 is not locked by the locking block 76, the movement of the slide core 50 in the Y-axis direction is restricted by a stopper 77. The stopper 77 is, for example, a stopper pin provided on the movable-side mold plate 71.

[0057] The slide core 50 is provided with an elastic mechanism such as a spring that applies pressure to the slide pin 40. As a result, by pressing the third cavity member 33 with the air cylinder 73, the slide core 50 can also be moved.

[0058] The movable mold 3 further includes an ejector device 60. The ejector device 60 includes an ejector pin 61, a first ejector plate 62, and a second ejector plate 63.

[0059] The ejector pin 61 is a protruding pin that penetrates a lower portion of the first cavity member 31. Specifically, the ejector pin 61 is configured to connect the first cavity member 31, the movable-side mold plate 71, and the movable-side back plate 72.

[0060] The ejector pin 61 is configured to be movable in a direction parallel to the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30. In this embodiment, the ejector pin 61 can slide in the Z-axis direction, which is the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30. As the ejector pin 61 slides, the tip of the ejector pin 61 is positioned inside the first cavity 4a of the first cavity member 31.

[0061] The first ejector plate 62 is an ejector plate located above the second ejector plate 63, and the second ejector plate 63 is an ejector plate located below the first ejector plate 62. The first ejector plate 62 and the second ejector plate 63 are provided between a pair of spacer blocks 78 in the Y-axis direction. The pair of spacer blocks 78 are provided between a movable-side mounting plate 79 that constitutes the lower end of the movable-side mold 3 and the movable-side back plate 72 in the Z-axis direction.

[0062] As described above, the injection molding die 1 according to this embodiment includes the fixed cavity member 10, the movable cavity member 30 divided into the first cavity member 31, the second cavity member 32, and the third cavity member 33, and the slide pin 40. The fixed cavity member 10 has an inner surface shape corresponding to the main body portion 111 and the shaft portion 112 of the first molded product 110, and an inner surface shape corresponding to the second molded product 120. The first cavity member 31 has an inner surface shape corresponding to the main body portion 111 of the first molded product 110. The second cavity member 32 has an inner surface shape corresponding to the shaft portion 112 of the first molded product 110, and is configured to be movable in a direction parallel to the direction in which the fixed cavity member 10 and the movable cavity member 30 open and close. The third cavity member 33 has an inner surface shape corresponding to the second molded product 120, and is configured to be movable in a direction intersecting the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30. The slide pin 40 is configured to be movable in a direction perpendicular to the opening and closing direction of the fixed-side cavity member 10 and the movable-side cavity member 30, and the tip portion 41 of the slide pin 40 has a shape corresponding to the shape of the hole portion 121 of the second molded product 120.

[0063] By using the injection molding die 1 configured in this manner, the first molded product 110 and the second molded product 120 can be produced separately without being connected within the injection molding die 1, and the produced first molded product 110 and second molded product 120 can be combined within the same injection molding die 1 to produce the assembled product 100. This makes it possible to produce and assemble the first molded product 110 and the second molded product 120 within the same injection molding die 1 without degrading the quality of the assembled product 100. Specifically, it is possible to produce the first molded product 110 and the second molded product 120 in separate injection molding dies, and then, after removing them from the injection molding die, to produce an assembled product 100 having the same quality as when the first molded product 110 and the second molded product 120 are combined.

[0064] [Manufacturing method for assembly products] Next, a specific method for manufacturing the assembly 100 using the above-described injection molding die 1 will be described with reference to Figures 4A to 4E. Figures 4A to 4E are diagrams showing the steps in the method for manufacturing the assembly 100 according to the embodiment. Figures 4A to 4E show the injection molding step, first sliding step, mold opening step, assembly step, and removal step, respectively.

[0065] In the manufacturing method for the assembly 100 according to this embodiment, the first molded product 110 and the second molded product 120 are formed as separate parts and are set-molded in the same injection mold 1. Below, the steps in the manufacturing method for the assembly 100 according to this embodiment will be described in order.

[0066] First, as shown in Fig. 4A, a first molded product 110 and a second molded product 120 are produced in the same injection mold 1 (injection molding process). Specifically, resin material for producing the first molded product 110 and the second molded product 120 is poured into the injection mold 1, and the resin material is introduced into the cavity 4 via the runner 5. Specifically, the resin material is introduced into each of the first cavity 4a and the second cavity 4b. As a result, the first molded product 110 having the shaft portion 112 is produced in the first cavity 4a, and the second molded product 120 having the hole portion 121 is produced in the second cavity 4b.

[0067] Specifically, the first molded product 110 having the shaft portion 112 is produced by solidifying a resin material filled in the first cavity 4a surrounded by the fixed-side cavity member 10, the first cavity member 31, and the second cavity member 32. The second molded product 120 having the hole portion 121 is produced by solidifying a resin material filled in the second cavity 4b surrounded by the fixed-side cavity member 10, the third cavity member 33, and the tip portion 41 of the slide pin 40.

[0068] In this process, the tip 41 of the slide pin 40 and the protrusion 10a of the fixed-side cavity member 10 are inserted into the hole 121 of the second molded product 120. At this time, the protrusion 10a of the fixed-side cavity member 10 and the tip surface of the tip 41 of the slide pin 40 are in contact with each other. In addition, the second molded product 120 is held by the tip 41 of the slide pin 40.

[0069] The second molded product 120 produced in this manner is a molded product having an undercut shape that becomes an undercut portion. Specifically, the hole 121 of the second molded product 120 becomes the undercut portion in the mold opening direction of the injection molding die 1. For example, in Fig. 4A, the portion above the hole 121 in the second molded product 120 becomes the undercut portion in the mold opening direction with respect to the fixed-side cavity member 10 of the injection molding die 1, and the portion below the hole 121 in the second molded product 120 becomes the undercut portion in the mold opening direction with respect to the movable-side cavity member 30 of the injection molding die 1.

[0070] Therefore, after the injection molding process, before the injection molding die 1 is opened at the parting surface 1a, an undercut process is performed on the second molded product 120. Specifically, as shown in FIG. 4B , the locking block 76 is slid upward in the Z-axis direction to unlock the slide pin 40. At this time, the fixed-side mold plate 21 and the runner stripper 22 open. Although not shown, the fixed-side mounting plate 23 and the runner stripper 22 also open. After unlocking the slide pin 40, the third cavity member 33 and the slide pin 40 are slid in a direction (the sliding direction indicated by the arrow in FIG. 4B ) in which the protrusion 10a of the fixed-side cavity member 10 and the tip 41 of the slide pin 40 move apart (first sliding process). In this embodiment, the air cylinder 73 slides the third cavity member 33 backward along the Y-axis direction, thereby moving the slide pin 40 and the slide core 50 backward along the Y-axis direction together with the third cavity member 33. The third cavity member 33 and the slide pin 40 are moved until the rear end surface of the slide core 50 supporting the third cavity member 33 abuts against the stopper 77 .

[0071] At this time, the slide pin 40 moves, and the second molded product 120 held by the tip 41 of the slide pin 40 also moves. As a result, the convex portion 10a of the fixed-side cavity member 10 comes out of the hole portion 121 of the second molded product 120, and the convex portion 10a of the fixed-side cavity member 10 and the hole portion 121 of the second molded product 120 separate from each other.

[0072] In addition, before sliding the third cavity member 33 and the slide pin 40, it is preferable to cut (gate cut) the gate resin portions connected to each of the first molded product 110 and the second molded product 120 using a cutting plate not shown, and then slide the third cavity member 33 and the slide pin 40.

[0073] Next, as shown in Fig. 4C, the movable-side cavity member 30 is moved to open the fixed-side cavity member 10 and the movable-side cavity member 30 (mold-opening step). That is, the fixed-side cavity member 10 and the movable-side cavity member 30 are separated at the part surface 1a (see Fig. 4B).

[0074] Furthermore, the second cavity member 32 is slid in a direction away from the first molded product 110 (second sliding step). Specifically, the movable-side mold plate 71 and the movable-side back plate 72 are opened, whereby the second cavity member 32 attached to the movable-side back plate 72 is slid downward in the Z-axis direction.

[0075] In this case, the second cavity member 32 is slid to a position where it does not interfere with the third cavity member 33 when the first molded product 110 and the second molded product 120 are combined in the next process. This makes it possible to form a space in which the third cavity member 33 can be slid in the Y-axis direction on the same axis as the axis of the shaft portion 112 of the first molded product 110 and the axis of the hole portion 121 of the second molded product 120.

[0076] For example, the second cavity member 32 moves until the upper surface of the second cavity member 32 is positioned lower than the lower surface of the first cavity member 31. In this embodiment, the second cavity member 32 is moved until the upper surface of the second cavity member 32 is positioned lower than the sliding surface of the slide core 50 on the movable-side mold plate 71.

[0077] The sliding of the second cavity member 32 (second sliding step) may be performed simultaneously with the mold opening step (mold opening step) of the fixed-side cavity member 10 and the movable-side cavity member 30, or the sliding of the second cavity member 32 (second sliding step) may be performed after the mold opening step (mold opening step) of the fixed-side cavity member 10 and the movable-side cavity member 30. In other words, the sliding of the second cavity member 32 (second sliding step) may be performed simultaneously with the mold opening in conjunction with the separation of the first cavity member 31 and the third cavity member 33 from the fixed-side cavity member 10 (i.e., during mold opening), or may be performed after the separation of the first cavity member 31 and the third cavity member 33 from the fixed-side cavity member 10 has been completed (i.e., after mold opening).

[0078] 4D, at least one of the first molded product 110 and the second molded product 120 is slid in the injection molding die 1 to fit the shaft 112 of the first molded product 110 into the hole 121 of the second molded product 120, thereby combining the first molded product 110 and the second molded product 120 (assembly process). This produces an assembled product 100 in which the first molded product 110 and the second molded product 120 are combined.

[0079] In this embodiment, the second molded product 120 is slid in a direction perpendicular to the direction in which the fixed-side cavity member 10 and the movable-side cavity member 30 open and close. Specifically, the air cylinder 73 slides the third cavity member 33 forward along the Y-axis direction in the direction in which the first molded product 110 and the second molded product 120 approach each other, thereby moving the slide pin 40 and slide core 50 forward along the Y-axis direction together with the third cavity member 33. As a result, the second molded product 120 held by the slide pin 40 slides in the direction in which it approaches the first molded product 110.

[0080] At this time, since the second cavity member 32 has been slid downward in the Z-axis direction in the previous process (the process of Figure 4C), the third cavity member 33, slide pin 40 and slide core 50 can slide without interfering with (i.e., colliding with) the second cavity member 32.

[0081] Then, by sliding the slide core 50 together with the slide pin 40 that holds the second molded product 120, the convex portion 51 (stopper) provided at the tip of the slide core 50 comes into contact with the movable-side mold plate 71. This causes the third cavity member 33, which is a slide member, to slide and push out the second molded product 120. By pushing out the second molded product 120 in this manner, the hole 121 of the second molded product 120 is inserted into the shaft portion 112 of the first molded product 110, which is coaxial with the hole 121 of the second molded product 120. In other words, the shaft portion 112 of the first molded product 110 and the hole 121 of the second molded product 120 are fitted together.

[0082] At this time, the tip surface of the tip portion 41 of the slide pin 40 comes into contact with the shaft portion 112 of the first molded product 110. Therefore, the shape of the tip surface of the tip portion 41 of the slide pin 40 is preferably a shape that fits into the shape of the tip surface of the shaft portion 112 of the first molded product 110. This makes it possible to prevent the position of the first molded product 110 from being shifted due to the impact when the tip portion 41 of the slide pin 40 comes into contact with the shaft portion 112 of the first molded product 110.

[0083] In this embodiment, the tip of the shaft 112 of the first molded product 110 is a conical convex portion, and the tip of the tip 41 of the slide pin 40 is shaped as a conical concave portion. As a result, the tip surface (convex conical surface) of the tip 41 of the slide pin 40 fits into the tip surface (concave conical surface) of the shaft 112 of the first molded product 110.

[0084] Next, as shown in FIG. 4E, the assembly 100 in which the first molded product 110 and the second molded product 120 are combined is removed from the injection mold 1 (removal step).

[0085] Specifically, first, the slide pin 40 and the slide core 50 are slid together with the third cavity member 33 in a direction separating the third cavity member 33 from the assembly 100. In this embodiment, the air cylinder 73 causes the third cavity member 33 to slide backward along the Y-axis direction, thereby causing the slide pin 40 and the slide core 50 to retreat along the Y-axis direction together with the third cavity member 33.

[0086] Thereafter, the assembly 100 is removed from the first cavity member 31 by the ejector device 60. Specifically, the first molded product 110 of the assembly 100 is pushed up from below by the ejector pin 61 of the ejector device 60, thereby removing the assembly 100 from the first cavity member 31. In this way, the assembly 100 in which the first molded product 110 and the second molded product 120 are combined can be removed from the injection molding die 1.

[0087] In the present embodiment, the shaft 112 of the first molded product 110 and the hole 121 of the second molded product 120 are fitted together by sliding the second molded product 120 without moving the first molded product 110, but this is not limiting. For example, the shaft 112 of the first molded product 110 and the hole 121 of the second molded product 120 may be fitted together by sliding the first molded product 110 without moving the second molded product 120. In other words, the injection molding die 1 may be provided with a structure that slides the first molded product 110 in the Y-axis direction (a structure similar to the structure that slides the second molded product 120). Alternatively, the shaft 112 of the first molded product 110 and the hole 121 of the second molded product 120 may be fitted together by sliding both the first molded product 110 and the second molded product 120 (for example, by sliding the first molded product 110 and the second molded product 120 so that they approach each other). In this way, when fitting the shaft 112 of the first molded product 110 and the hole 121 of the second molded product 120 together, it is sufficient to slide at least one of the first molded product 110 and the second molded product 120.

[0088] As described above, according to the manufacturing method of the assembled product 100 of this embodiment, the first molded product 110 and the second molded product 120 are manufactured separately without being connected within the injection molding die 1, and then, by performing a sliding operation to slide at least one of the first molded product 110 and the second molded product 120, the first molded product 110 and the second molded product 120 are subsequently combined within the injection molding die 1 to manufacture the assembled product 100. In other words, assembly can be performed within the same mold after injection molding. This allows stable assembly without errors in the alignment accuracy of the first molded product 110 and the second molded product 120. Furthermore, performing assembly within the same mold after injection molding eliminates the need for special equipment and reduces the assembly process. It also eliminates the need to manage the first molded product 110 and the second molded product 120 individually, thereby reducing inventory management.

[0089] [summary] As described above, the assembly 100 according to this embodiment includes the first molded product 110 having the shaft portion 112 and the second molded product 120 having the hole portion 121, and the first molded product 110 and the second molded product 120 are combined by fitting together the shaft portion 112 and the hole portion 121 in a slidable state. The second molded product 120 has an undercut shape in the injection molding die 1. The first molded product 110 and the second molded product 120 each have a shape that allows them to be molded in the same injection molding die 1 and to be combined within the injection molding die 1.

[0090] With this configuration, even if the second molded product 120 has an undercut shape relative to the injection molding die 1, by using the above-mentioned injection molding die 1, the first molded product 110 and the second molded product 120 can be molded in a separate state inside the same injection molding die 1, and the first molded product 110 and the second molded product 120 can be combined inside the injection molding die 1. Therefore, the first molded product 110 and the second molded product 120 can be produced and assembled inside the same injection molding die 1 in a state where the first molded product 110 and the second molded product 120 can slide against each other, without degrading the quality of the assembled product 100.

[0091] In the assembly 100 according to this embodiment, the shaft 112 of the first molded product 110 has a protrusion 112a that serves as a disassembly prevention part that prevents disassembly of the combined first molded product 110 and second molded product 120. Specifically, the protrusion 112a protrudes from the side surface of the shaft 112 in a direction intersecting the axis of the shaft 112.

[0092] This configuration makes it possible to prevent disassembly of the combined first molded product 110 and second molded product 120. Furthermore, even if the first molded product 110 is provided with the protrusion 112a, which serves as a disassembly prevention part, the first molded product 110 and the second molded product 120 can be molded separately inside the same injection molding die 1, and the first molded product 110 and the second molded product 120 can be combined inside the injection molding die 1.

[0093] In the assembly 100 according to this embodiment, the first molded product 110 has a positioning portion 113 .

[0094] With this configuration, when the first molded product 110 is produced using the injection molding die 1, the position of the first molded product 110 can be determined so that the position of the first molded product 110 does not shift relative to the injection molding die 1. This point will be explained below with reference to Figures 5 and 6. Figure 5 is a diagram for explaining the effect of the positioning portion 113 of the first molded product 110. Figure 6 is a diagram showing the configuration of the positioning portion 113 of the first molded product 110.

[0095] As in the above embodiment, when the first molded product 110 is produced using the injection mold 1 (step in FIG. 4A), a resin material is introduced into the first cavity 4a of the injection mold 1 and solidified, during which the resin material shrinks. If the first molded product 110 does not have a positioning portion 113, the position of the first molded product 110 will change when the resin material shrinks significantly in the Y-axis direction, resulting in a misalignment of the first molded product 110 in the first cavity 4a. For example, the first molded product 110 may recede in a direction away from the second molded product 120. As a result, if the first molded product 110 does not have a positioning portion 113, when the third cavity member 33 is slid in the Y-axis direction to combine the first molded product 110 and the second molded product 120 (step in Figure 4D), the shaft portion 112 of the first molded product 110 may not fit into the specified position in the hole portion 121 of the second molded product 120.

[0096] 5 and 6, if the first molded product 110 is provided with a positioning portion 113, the end face 113a of the positioning portion 113 restricts movement of the first molded product 110 when the resin material shrinks in the first cavity 4a, thereby preventing the first molded product 110 from shifting position. In other words, the first molded product 110 is positioned by the end face 113a in the Y-axis direction, which is the resin shrinkage direction, and it is possible to reduce change in position in the Y-axis direction due to shrinkage of the resin material.

[0097] In this way, the positioning portion 113 prevents the position of the first molded product 110 in the injection molding die 1 from changing due to shrinkage of the resin material that constitutes the first molded product 110. Specifically, the positioning portion 113 has an end surface 113a perpendicular to the direction in which the resin material that constitutes the first molded product 110 shrinks (the resin shrinkage direction). This allows the shaft portion 112 of the first molded product 110 to be accurately fitted into the hole portion 121 of the second molded product 120 when the third cavity member 33 is slid in the Y-axis direction to combine the first molded product 110 and the second molded product 120 (the step of FIG. 4D). This reduces assembly defects between the first molded product 110 and the second molded product 120.

[0098] 5 and 6, it is desirable that the central axis of the positioning portion 113 is coaxial with the shaft portion 112. This effectively prevents the position of the first molded product 110 from shifting in the resin contraction direction. However, even if the central axis of the positioning portion 113 is not coaxial with the shaft portion 112, it is still possible to prevent the position of the first molded product 110 from shifting in the resin contraction direction.

[0099] (Variation) Next, a modified example of the injection molding die 1 according to the above embodiment will be described below.

[0100] [Variation 1] First, an injection molding die 1A according to Modification 1 will be described with reference to Fig. 7. Fig. 7 is a cross-sectional view of injection molding die 1A according to Modification 1 cut along the XY plane.

[0101] While the injection molding die 1 in the above embodiment produces one first molded product 110, the injection molding die 1A in this modified example produces three first molded products 110, as shown in Fig. 7. In this case, three first molded products 110 are combined with one second molded product 120A, so three holes 121 are formed in the second molded product 120A produced by the injection molding die 1A. For this reason, three slide pins 40 are inserted into the third cavity member 33. In addition, three protrusions 10a are formed in the fixed-side cavity member 10.

[0102] In this modification, the number of first molded products 110 is three, but this is not limited to this. In other words, the injection molding die 1A may be configured to be able to produce any number of first molded products 110. In this case, the second molded product 120A only needs to be provided with the same number of holes 121 as the number of first molded products 110. The second molded product 120A may be divided into multiple parts, each with one hole 121 or each with multiple holes 121.

[0103] In this modified example, multiple first molded products 110 are produced in the injection mold 1A, and then the multiple first molded products 110 are assembled to one second molded product 120A to produce the assembled product 100A. This allows the range of product fields to which the assembled product 100A can be applied to to be expanded.

[0104] [Variation 2] Next, an injection molding die 1B according to Modification 2 will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view of injection molding die 1B according to Modification 2 cut along the XY plane.

[0105] While the injection molding die 1 in the above embodiment produces one second molded product 120, the injection molding die 1B in this modified example produces three second molded products 120, as shown in Fig. 8. In this case, three second molded products 120 are combined with one first molded product 110B, so the first molded product 110B produced by the injection molding die 1B is provided with three shaft portions 112. Also in this modified example, three slide pins 40 are inserted into the third cavity member 33, and three protrusions 10a are provided on the fixed-side cavity member 10.

[0106] In this modification, the number of second molded products 120 is three, but this is not limited to this. In other words, the injection molding die 1B may be configured to be able to produce any number of second molded products 120. In this case, the first molded product 110B may be provided with the same number of shaft portions 112 as the number of second molded products 120. The first molded product 110B may be divided into multiple parts, each with one shaft portion 112 or each with multiple shaft portions 112.

[0107] In this manner, in this modification, a plurality of second molded products 120 are produced in the injection mold 1B, and then the plurality of second molded products 120 are assembled to one first molded product 110B to produce the assembled product 100B. This makes it possible to expand the range of product fields to which the assembled product 100B can be applied.

[0108] [Variation 3] Next, an injection molding die 1C according to Modification 3 will be described with reference to Fig. 9. Fig. 9 is a cross-sectional view of injection molding die 1C according to Modification 3 cut along the XY plane.

[0109] While the injection molding die 1 in the above embodiment produced a first molded product 110 having one shaft portion 112 and a second molded product 120 having one hole portion 121, the injection molding die 1C in this modification produces a first molded product 110B having three shaft portions 112 and a second molded product 120A having three holes 121, as shown in Fig. 9. Also in this modification, three slide pins 40 are inserted into the third cavity member 33, and three protrusions 10a are provided on the fixed-side cavity member 10.

[0110] In this modification, the first molded product 110B has three shanks 112 and the second molded product 120A has three holes 121, but this is not limited to this. In other words, the injection molding die 1C may be configured to be able to produce a first molded product 110B having any number of shanks 112 and a second molded product 120A having any number of holes 121.

[0111] In this modified example, a first molded product 110B having a plurality of shaft portions 112 and a second molded product 120A having a plurality of holes 121 are produced in an injection molding die 1C, and the second molded product 120A is then assembled to the first molded product 110B to produce an assembled product 100C. This makes it possible to expand the range of product fields to which the assembled product 100C can be applied.

[0112] [Variation 4] Next, an injection molding die 1D according to Modification 4 will be described with reference to Fig. 10 and Fig. 11. Fig. 10 is a perspective view of a first molded product 110D produced by the injection molding die 1D according to Modification 4. Fig. 11 is a cross-sectional view showing a part of the injection molding die 1D according to Modification 4.

[0113] 10, in a first molded product 110D according to this modification, two shafts 112D are provided on a main body 111, and each of the two shafts 112D is provided with a protrusion 112b. The two shafts 112D are aligned in the mold opening direction (Z-axis direction) of the injection molding die 1D.

[0114] Like the protrusion 112a in the above embodiment, the protrusion 112b of each shaft portion 112D protrudes from the side surface of the shaft portion 112D in a direction intersecting the axis of the shaft portion 112D. Also, like the protrusion 112a, the protrusion 112b is provided at the tip end of the shaft portion 112D and protrudes radially outward from the shaft portion 112D.

[0115] The protrusion 112b in this modified example has a different shape from the protrusion 112a in the above embodiment. Specifically, while the protrusion 112a in the above embodiment is formed around the entire circumference of the tip of the shaft 112, the protrusion 112b in this modified example is formed on half the circumference of the tip of the shaft 112D. In other words, the protrusion 112b protrudes radially from half the circumference of the tip of the shaft 112D. Specifically, the protrusion 112b is provided on the outer half circumference of each of the two shafts 112D.

[0116] Two second molded products 120 are combined with a first molded product 110D having two shaft portions 112D. That is, each of the two shaft portions 112D is fitted into a hole 121 of a different second molded product 120. Similar to the protrusion 112a in the above embodiment, the protrusion 112b provided on each shaft portion 112D functions as a retaining prevention portion that prevents each shaft portion 112D of the first molded product 110D from falling out of the hole 121 of the second molded product 120 after the first molded product 110D and the second molded product 120 are combined. That is, the protrusion 112b is a disassembly prevention portion that prevents the combined first molded product 110D and the second molded product 120 from disassembling. This makes it possible to prevent disassembly of the assembled product after combining the first molded product 110D and the second molded product 120, thereby obtaining a highly reliable and high-quality assembled product.

[0117] A protrusion 112b of this shape becomes an undercut portion in the injection molding die 1D in the Y-axis direction, and the lower of the two shaft portions 112E aligned in the mold opening direction (Z-axis direction) of the injection molding die 1D becomes an undercut portion.However, by using the injection molding die 1D shown in Figure 11, a first molded product 110D can be produced by injection molding, and the first molded product 110D can be combined with a second molded product 120.

[0118] The injection molding mold 1D of this modified example shown in Figure 11 differs from the injection molding mold 1 in the above embodiment in that the fixed side cavity member 10 has a recess 10b formed therein that corresponds to the protrusion 112b of the upper shaft portion 112D of the first molded product 110D, and the second cavity member 32 of the movable side cavity member 30D has a recess 32a formed therein that corresponds to the protrusion 112b of the lower shaft portion 112D of the first molded product 110D.

[0119] Furthermore, in the injection molding die 1D of this modified example, the movable-side cavity member 30D has a fourth cavity member 34 that constitutes the first cavity 4a together with the first cavity member 31, the second cavity member 32, and the fixed-side cavity member 10. Therefore, the fourth cavity member 34 has an inner surface shape that corresponds to the first molded product 110D. Specifically, the fourth cavity member 34 has an inner surface shape that corresponds to the portion between the two shaft portions 112D on the end face of the main body portion 111 of the first molded product 110D, as the inner surface shape that corresponds to the first molded product 110D.

[0120] Because the protruding portion 112b of the shaft portion 112D of the first molded product 110D is an undercut portion and the lower of the two shaft portions 112D is also an undercut portion, the fourth cavity member 34 is configured to be able to slide in the Y-axis direction. In this way, the fourth cavity member 34 is a movable slide member configured to be able to slide. Specifically, the fourth cavity member 34 slides on the upper surface of the second cavity member 32 along the Y-axis direction.

[0121] Additionally, an angular pin 81 is inserted into the through hole 34a of the fourth cavity member 34 and the recess 10c of the fixed cavity member 10. As a result, when the fixed cavity member 10 and the movable cavity member 30D are mold-opened, the angular pin 81 causes the fourth cavity member 34 to slide in the Y-axis direction (to the right in FIG. 11) away from the first molded product 110D. At this time, the fourth cavity member 34 slides until it abuts against a stopper 82. The stopper 82 is, for example, a stopper pin provided in the second cavity member 32.

[0122] By using an injection molding die 1D configured in this manner, even if the second molded product 120 has an undercut shape relative to the injection molding die 1D, the first molded product 110D and the second molded product 120 can be molded separately inside the same injection molding die 1D, and the first molded product 110D and the second molded product 120 can be combined inside the injection molding die 1D. Therefore, the first molded product 110 and the second molded product 120 can be produced and assembled in the same injection molding die 1D in a state where the first molded product 110 and the second molded product 120 can slide against each other, without degrading the quality of the assembled product 100.

[0123] While the first molded product 110D shown in FIG. 10 has one positioning portion 113, this is not limiting. Specifically, the first molded product 110E shown in FIG. 12 may have two positioning portions 113. In this case, the first molded product 110E having two positioning portions 113 can be produced by using the injection molding die 1E shown in FIGS. 12 and 13. As shown in FIG. 13, the injection molding die 1E has a first cavity member 31 and a second cavity member 32 of a movable cavity member 30E, which have inner surface shapes corresponding to the first molded product 110E, including the lower one of the two shaft portions 112D, in comparison with the injection molding die 1D.

[0124] In the first molded product 110E shown in FIG. 12, the two positioning portions 113 are arranged so that their respective central axes are coaxial with the two shaft portions 112D, respectively. However, this is not limited to this. That is, the central axis of the positioning portion 113 does not have to be coaxial with the shaft portion 112D of the shaft portion 112D. For example, as shown in FIG. 14, the lower of the two positioning portions 113 does not have to be arranged so that its central axis is coaxial with the shaft portion 112D. In FIG. 14, the lower positioning portion 113 is arranged on the lower end surface of the main body 111 of the first molded product 110F. Note that in FIG. 14, the central axis of the upper positioning portion 113 is coaxial with the upper of the two shaft portions 112D, as in FIGS. 10 and 12.

[0125] (Other variations) The manufacturing method of an assembly and the injection molding die according to the present disclosure have been described above based on the embodiments and various modified examples, but the present disclosure is not limited to the above-described embodiments and various modified examples.

[0126] For example, in the above embodiment, the tip surface of the shaft portion 112 of the first molded product 110 is convex and the tip surface of the tip portion 41 of the slide pin 40 is concave. However, this is not limited to this, and the convex and concave shapes may be interchanged. Specifically, as shown in FIG. 15 , the tip surface of the shaft portion 112G of the first molded product 110G may be concave, and the tip surface of the tip portion 41G of the slide pin 40G may be concave. In this case, too, it is possible to prevent the position of the first molded product 110G from being shifted due to the impact when the tip portion 41G of the slide pin 40G abuts against the shaft portion 112G of the first molded product 110G. Furthermore, as in the above embodiment, the first molded product 110G and the second molded product 120 can be combined inside the injection molding die 1G with the shaft portion 112G of the first molded product 110G and the hole portion 121 of the second molded product 120 aligned.

[0127] In the above embodiment and each modified example, the cross-sectional shape of the protrusion 112a provided on the shaft 112 of the first molded product 110 is semicircular, but this is not limited to this. For example, as in the assembly 100H shown in Fig. 16, the cross-sectional shape of the protrusion 112aH provided on the shaft 112H of the first molded product 110H may be triangular.

[0128] In addition, in the above-described embodiment and each modified example, the tapered surface 121a provided in the hole 121 of the second molded product 120 is a C-surface, but this is not limited to this. For example, as in an assembly 100I shown in Fig. 17, the tapered surface 121aI provided in the hole 121 of the second molded product 120I may be a rounded surface having curvature. In this case, the tapered surface 121aI may be a protruding rounded surface.

[0129] In the above-described embodiment and each modified example, the disassembly prevention portion that prevents disassembly of the combined first molded product 110 and second molded product 120 is provided on the first molded product 110 as the protrusion 112a, but this is not limited thereto. Specifically, as in the assembled product 100J shown in FIG. 18, the disassembly prevention portion may be provided on the second molded product 120J. In this modified example, the disassembly prevention portion provided on the second molded product 120J is provided on the inner surface of a hole 121 of the second molded product 120J. Specifically, the disassembly prevention portion provided on the second molded product 120J is a protrusion 122 that protrudes from the inner surface of the hole 121 in a direction intersecting the axis of the shaft portion 112J of the first molded product 120J. Note that in FIG. 18, the shaft portion 112J of the first molded product 120J does not have a disassembly prevention portion (protrusion 112a), but this is not limited thereto. Specifically, the shaft 112J of the first molded product 120J may also be provided with a disassembly prevention portion (protrusion 112a) as shown in Fig. 1. In other words, the disassembly prevention portion may be provided on both the first molded product 110 and the second molded product 120. In this way, it is sufficient that the disassembly prevention portion is provided on at least one of the first molded product and the second molded product. Note that the disassembly prevention portion does not have to be provided on either the first molded product or the second molded product.

[0130] Furthermore, in the above-described embodiment and each of the modified examples, the injection molding die 1 is opened with the upper die being the fixed die 2 and the lower die being the movable die 3, but this is not limited to this. Specifically, the injection molding die 1 may be opened with the upper fixed die 2 being the movable die and the lower movable die 3 being the fixed die.

[0131] In the above embodiment and each modification, the runner 5 for introducing the resin material into the first cavity 4a and the second cavity 4b is a single runner shared by both the first cavity 4a and the second cavity 4b. However, this is not limited to this. For example, the runner for introducing the resin material into the first cavity 4a and the runner for introducing the resin material into the second cavity 4b may be separate. This allows the first molded product 110 and the second molded product 120 to be produced using different resin materials.

[0132] In the above embodiment and each modification, the sliding movement of the third cavity member 33 and the slide pin 40 is performed using the air cylinder 73, but this is not limiting. The sliding movement of the third cavity member 33 and the slide pin 40 may be performed by a mechanical movement using a cam, instead of a cylinder movement using the air cylinder 73.

[0133] In addition, in the above-described embodiment and each modification, the case where two types of molded products, a first molded product and a second molded product, are assembled has been described, but this is not limiting. For example, the technology of the present disclosure may be applied to the case where three or more types of molded products are assembled.

[0134] In addition, the present invention also includes forms obtained by applying various modifications that a person skilled in the art would conceive of to the above-described embodiments and modifications, and forms realized by arbitrarily combining the components and functions of the embodiments and modifications within the scope of the spirit of the present invention. Furthermore, the present invention also includes any combination of two or more claims from the claims set forth in the claims at the time of filing, provided that there is no technical contradiction. For example, when a dependent claim set forth in the claims at the time of filing is made into a multiple claim or multiple multiple claims that cites all of the superordinate claims within the scope of technical contradiction, the present invention also includes all combinations of claims included in that multiple claim or multiple multiple multiple claim. [Industrial Applicability]

[0135] The technology of the present disclosure is useful for assembling a plurality of molded products, etc. [Explanation of symbols]

[0136] 1, 1A, 1B, 1C, 1D, 1E, 1G Injection mold 1a Part surface 2 Fixed side mold 3 Movable mold 4 cavities 4a First cavity 4b Second cavity 5 Runner 10 Fixed side cavity member 10a Convex part 10b, 10c recess 21 Fixed side template 22 Runner Stripper 23 Fixed side mounting plate 24 Locate Ring 25 Sprue bushing 30, 30D, 30E Movable cavity member 31 first cavity member 32 second cavity member 32a Recess 33 Third cavity member 33a Through hole 34 Fourth cavity member 34a through hole 40, 40G slide pin 41, 41G tip 50 Slide Core 51 Convex part 60 Ejector device 61 Ejector pin 62 First ejector plate 63 Second ejector plate 71 Movable side template 72 Movable back plate 73 Air Cylinder 73a Piston rod 74 Bracket 75 Backboard 76 Locking Block 77 Stopper 78 Spacer Block 79 Movable side mounting plate 81 Angularpin 82 Stopper 100, 100A, 100B, 100C, 100H, 100I, 100J Assembly 110, 110B, 110D, 110E, 110F, 110G, 110H, 110J 1st molded product 111 Main body 112, 112D, 112E, 112G, 112H, 112J shaft part 112a, 112aH, 112b protrusion 113 Positioning part 113a End face 120, 120A, 120I, 120J 2nd molded product 121 Hole 121a, 112aI tapered surface 122 Protrusion

Claims

1. a first molded product having a shaft portion; a second molded product having a hole, The first molded product and the second molded product are combined by fitting the shaft portion and the hole portion together in a slidable state, the second molded product has an undercut shape in an injection molding die, each of the first molded product and the second molded product has a shape that can be molded in the same injection mold and combined in the injection mold; Assembled product.

2. At least one of the first molded product and the second molded product has a disassembly prevention portion that prevents the combined first molded product and the second molded product from being disassembled.

10. The assembly of claim 1.

3. The disassembly prevention portion is provided on the shaft portion of the first molded product.

3. The assembly of claim 2.

4. The disassembly prevention portion is a protrusion that protrudes from a side surface of the shaft portion in a direction intersecting an axis of the shaft portion.

4. The assembly of claim 3.

5. The disassembly prevention portion is provided on the inner surface of the hole portion of the second molded product.

3. The assembly of claim 2.

6. The disassembly prevention portion is a protrusion that protrudes from the inner surface of the hole portion in a direction intersecting the axis of the shaft portion.

6. The assembly of claim 5.

7. the first molded product has a positioning portion that suppresses a change in position of the first molded product in the injection molding die due to shrinkage of a resin material that constitutes the first molded product when the first molded product is produced in the injection molding die; 7. The assembly according to any one of claims 1 to 6.

8. the positioning portion has a plane perpendicular to a direction in which the resin material constituting the first molded product shrinks; 8. The assembly of claim 7.

9. a shape of a tip end surface of the shaft portion that fits into a shape of a tip end surface of a member that constitutes the injection molding die and that is inserted into the hole of the second molded product within the injection molding die; 7. The assembly according to any one of claims 1 to 6.

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