JP6295216B2 - Injection molding device and connected molded product - Google Patents

Description

  The present invention relates to an injection molding apparatus for manufacturing a connected molded product formed by connecting a pipe-shaped hollow body and a box having an open surface through a hinge, and a connected molded product manufactured by the injection molding apparatus. Is.

  Conventionally, as a technique related to the above-described injection molding apparatus, for example, there is a method for manufacturing a hollow body described in Patent Document 1 below.

  In the manufacturing method according to Patent Document 1, a pipe-shaped hollow body is manufactured by an injection molding method. At that time, a molten thermoplastic resin in an amount larger than the required amount required for forming the hollow body is injected into the mold cavity corresponding to the outer shape of the hollow body. Next, a floating core of a size that can pass through the mold cavity is pushed by the pressurized fluid from the pressurized port of the cavity to move along the mold cavity through the molten resin in the mold cavity to the outlet of the mold cavity. Let Then, the pressure of the pressurized fluid is maintained until the entire molten resin adhering to the inner wall of the mold cavity is solidified in the mold cavity.

  As described above, the floating core moves in the molten resin in the mold cavity, so that a good cavity portion is formed while being injection molded. Furthermore, since the resin is pressed against the mold cavity by applying pressure from the cavity, the surface state of the molded product (hollow body) is smooth, and there is no sink or warp.

JP-A-4-208425

  However, when the pipe-shaped hollow body and the box are integrally connected and integrally formed using the manufacturing method described in Patent Document 1, the connecting portion between the end of the hollow body and the box is used. A part of the hollow body remains inside the box.

  As described above, a part of the hollow body remaining inside the box is generally unnecessary, and therefore a cutting process for cutting the unnecessary part from the connected molded product is required. As a result, when manufacturing a connected molded product, an increase in cost was caused, and the productivity was reduced.

  The present invention has been made in view of the above-described points, and when forming a connection molded product formed by connecting a pipe-shaped hollow body and a box body having one open surface via a hinge, It is an object of the present invention to provide an injection molding apparatus and a connected molded product that can prevent a part from remaining inside the box body and omit a cutting step of cutting a part of the hollow body.

Injection molding apparatus according to claim 1 for solving this problem, a hollow body cavity, said box body and box body cavity and the hollow body with one side forming the opened box body for forming a pipe-shaped hollow body It has a hinge cavity for molding a hinge for connecting the hollow body cavity, the box body cavity and the hinge cavity and mold communicate with each other, from the firing base which is disposed at one end of the hollow body cavity fired, the addition to moving the hollow body resin filled in the cavity by extruding a resin and a floating core shaping the hollow body, provided inside the hollow body cavity, the floating core and the projectile base surrounded by a, a first cavity for molding the first engaging portion at one end of the hollow body, provided in the mold, the box body Continuously Yabiti, characterized in that a second cavity for molding the second engaging portion engaged with the first engaging portion.

  An injection molding apparatus according to a second aspect is the injection molding apparatus according to the first aspect, wherein the first cavity forms a convex portion at the first engaging portion, and the second cavity is the second A concave portion that engages with the convex portion is formed in the engaging portion.

An injection molding apparatus according to a third aspect is the injection molding apparatus according to the first or second aspect, wherein the projecting base is provided with a projecting piece that forms a slit at one end of the hollow body. It is characterized by being.

  Further, a connected molded product according to claim 4 is formed at one end of the hollow body, a pipe-shaped hollow body, a box body having one open surface, a hinge connecting the hollow body and the box body, and the hollow body. A first engagement portion formed on the box body and a second engagement portion engageable with the first engagement portion, the hollow body and the box body via the hinge The first engaging portion and the second engaging portion are engaged with each other in a connected state, thereby being integrated with each other.

  Further, the connected molded product according to claim 5 is the connected molded product according to claim 4, wherein the convex molded portion formed in the first engaging portion and the second engaging portion are formed. And a concave portion engaged with the convex portion of the first engaging portion.

  Further, a connected molded product according to claim 6 is the connected molded product according to claim 4 or 5, wherein the connected molded product includes a slit formed at one end of the hollow body.

  In the injection molding apparatus according to claim 1, a hollow body cavity for forming a pipe-like hollow body, a box body cavity for forming a box body with one surface opened, and a hinge for forming a hinge for connecting the hollow body and the box body A hollow body cavity, a box cavity, and a hinge cavity having a cavity, a mold that communicates with each other, and a resin that is fired from a launch base disposed at one end of the hollow body cavity and filled into the hollow body cavity Since it has a floating core that moves inside and extrudes resin to form a hollow body, the hollow body, the box body and the hinge are molded integrally with the hollow body and the box body connected by a hinge. The body is molded by moving the floating core through the resin filled in the hollow body cavity and extruding the resin.

  At this time, in the inside of the mold, at the one end portion of the hollow body cavity, the first cavity for forming the first engaging portion at the one end portion of the hollow body by cooperation of the launch base and the floating core, and the box body Since the second cavity for forming the second engaging portion that engages with the first engaging portion is formed at one end of the cavity, when the hollow body, the box body, and the hinge are integrally formed, A first engagement portion is molded at one end and a second engagement portion is molded at one end of the box.

  When assembling the hollow body and the box body after such molding, the first engagement portion formed at one end portion of the hollow body and the one end portion of the box body with the hollow body and the box body connected via a hinge The hollow body and the box body can be easily assembled by elastically engaging the second engaging portions formed in the above.

  In the state where the hollow body and the box are assembled in this way, a part of the hollow body does not remain inside the box, and accordingly, a cutting process for cutting off a part of the unnecessary hollow body in the box is performed. It can be omitted.

  Further, the hollow body and the box can be assembled and joined easily and reliably by the operation of merely elastically engaging the first engaging portion of the hollow body and the second engaging portion of the box.

Moreover, by providing a hollow body cavity, a box body cavity and a hinge cavity in the mold, the hollow body, the box body and the hinge can be integrally molded, thereby reducing the mold size and reducing the amount of injection resin. reduction since it is possible, it is possible to improve both productivity when the cost of such equipment cost, material cost can be suppressed.

  In the injection molding apparatus according to claim 2, the first cavity forms a convex portion at the first engaging portion, and the second cavity forms a concave portion that engages with the convex portion at the second engaging portion. Since the first engaging portion and the second engaging portion are engaged with each other, the convex portion formed on the first engaging portion and the concave portion formed on the second engaging portion are both The hollow body and the box body can be assembled and joined more easily and reliably, and the assembly joint can be further prevented from coming off.

  In the injection molding device according to the third aspect, since the projecting piece that forms the slit at one end portion of the hollow body is provided on the launch base, the first engaging portion and the second engaging portion are engaged with each other. The first engaging portion can be expanded through the slit formed in the one end portion of the hollow body by the protruding piece, and the hollow body and the box body can be assembled and joined more easily and reliably.

In the connected molded product according to claim 4, the pipe-shaped hollow body, the box with one side opened, the hinge connecting the hollow body and the box, and the first engagement formed at one end of the hollow body. And a second engaging portion formed on the box and engageable with the first engaging portion, wherein the hollow body and the box are connected to each other via a hinge in the first engagement. When the hollow body and the box body in the connected molded product are assembled, the hollow body and the box body are connected via a hinge. In this state, the hollow body and the box are formed by elastically engaging the first engaging part formed at one end of the hollow body and the second engaging part formed at one end of the box. You can easily assemble your body.
In the state where the hollow body and the box are assembled in this way, a part of the hollow body does not remain inside the box, and accordingly, a cutting process for cutting off a part of the unnecessary hollow body in the box is performed. It can be omitted.

  Further, the hollow body and the box can be assembled and joined easily and reliably by the operation of merely elastically engaging the first engaging portion of the hollow body and the second engaging portion of the box.

In the connected molded product according to claim 5, the convex portion formed in the first engagement portion and the concave portion formed in the second engagement portion and engaged with the convex portion of the first engagement portion. than has, for engaging the first engaging portion and the second engagement portion, both the recess which is molded in a convex portion which is formed with the second engaging portion to the first engagement portion The hollow body and the box body can be assembled and joined more easily and reliably, and the assembly joint can be further prevented from coming off.

  In the connected molded product according to the sixth aspect, since the slit formed at one end portion of the hollow body is provided, when the first engagement portion and the second engagement portion are engaged with each other, The first engaging portion can be expanded through the formed slit, and the hollow body and the box can be assembled and joined more easily and reliably.

It is a perspective view showing the connection molded product which concerns on 1st Embodiment of this invention. It is a perspective view showing the use condition of a connection molding. It is a schematic cross section for demonstrating the structure of the injection molding apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the state before the movement of a floating core is started when shaping | molding of a hollow body is started in a hollow body cavity. It is a perspective view showing a launch base. It is a front view showing a launch base. It is sectional drawing which cut | disconnected and represented the launch base by the AA of FIG. It is a perspective view showing the launching base in which the floating core was installed. It is a front view showing the launch base with the floating core installed. It is sectional drawing which cut | disconnected and represented the launching base in which the floating core was installed by the BB line of FIG. It is explanatory drawing which shows the state before the movement of a floating core is started in the hollow body cavity with which resin was filled. It is explanatory drawing which shows the state which the floating core moved to the final position along the hollow body cavity by the hollow body cavity. It is sectional drawing which represented the hollow body shape | molded by the hollow body cavity by cut | disconnecting the CC line | wire of FIG. It is sectional drawing which represented the connection molded product which engaged the edge part of the hollow body, and the edge part of the box body by the line CC of FIG. It is a perspective view showing the connection molded product which concerns on 2nd Embodiment. It is a perspective view showing the use condition of a connection molding. It is a schematic cross section for demonstrating the structure of the injection molding apparatus which concerns on 2nd Embodiment. It is explanatory drawing which shows the state before the movement of a floating core is started when shaping | molding of a hollow body is started in a hollow body cavity. It is a perspective view showing a launch base. It is a perspective view showing the launching base in which the floating core was installed. FIG. 21 is a cross-sectional view of a launch base on which a floating core is installed, cut along line DD in FIG. 20. It is sectional drawing which cut | disconnected and represented the connection molded product which engaged the edge part of the hollow body, and the edge part of the box with the EE line | wire of FIG.

  An injection molding apparatus and a connected molded product according to the present invention will be described in detail with reference to the drawings based on a first embodiment that embodies the present invention.

[1. Connected molded product]
As shown in FIG. 1, the connected molded product 1 according to the first embodiment includes a pipe-shaped hollow body 2, a box 3 with one surface (upper surface in FIG. 2) open, and an integral hinge 4 that connects the two. It is a resin molded product manufactured by injection molding of a molten resin. The hollow body 2 is composed of a three-dimensional bent pipe. The integral hinge 4 is a hinge that connects the hollow body 2 and the box 3 and is bendable.

  The one end opening 5 of the hollow body 2 is provided with a first engagement portion 6 having a convex portion 25 (see FIG. 13) along its inner surface. On the side surface of the box body 3, a second engaging portion 7 is provided which is formed to project in a cylindrical shape. An annular concave portion 8 is provided near the base of the outer peripheral surface of the second engaging portion 7. The second engagement portion 7 is provided with a slit S1.

  As shown in FIG. 2, in the joint molded product 1 according to the first embodiment, the hollow body 2 and the box body 3 can be assembled and joined by bending the integral hinge 4 into a U shape. . When assembling and joining, the first engaging portion 6 formed in the one end opening 5 of the hollow body 2 is connected to the second engaging portion 7 with respect to the cylindrical second engaging portion 7 in the box 3. It is inserted from the outside. When the first engaging portion 6 is inserted into the second engaging portion 7, the convex portion 25 of the first engaging portion 6 is elastically engaged with the concave portion 8 of the second engaging portion 7.

[2. Injection molding device]
To manufacture the connected molded product 1 according to the first embodiment, the mold 9 shown in FIG. 3 is used. The mold 9 is provided with a hollow body cavity 10, a box body cavity 11, and a hinge cavity 12. The hollow body cavity 10 and the box body cavity 11 are communicated with each other via a hinge cavity 12.
In the mold 9, a second cavity K <b> 2 for molding a second engagement portion 7 described later is provided on the side portion (lower side portion in FIG. 3) of the box cavity 11.

  In the hollow body cavity 10, the hollow body 2 that is a three-dimensional bent pipe is formed. In the box cavity 11, the box 3 having one surface opened is formed. In the hinge cavity 12, the integral hinge 4 is formed.

  The mold 9 is provided in the injection molding apparatus 13 according to the first embodiment. In addition, regarding the injection molding apparatus 13 according to the first embodiment, a known technique (for example, a liner that fills each cavity of the mold 9 with a resin, a resin that is extruded when the hollow body 2 is molded, except for matters specifying the present invention. The description of the escape configuration etc. is omitted.

  Hereinafter, a method for forming the first engagement portion 6 provided in the one end opening 5 of the hollow body 2 will be described. When the first engagement portion 6 provided in the one end opening 5 of the hollow body 2 is molded by the mold 9, the box 3 and the integral hinge 4 are also molded by the mold 9 at the same time. That is, in the mold 9, the connected molded product 1 is integrally molded, but the molding technique for the box 3 and the integral hinge 4 is a known technique, and thus the description thereof is omitted.

In the injection molding apparatus 13 according to the first embodiment, as shown in FIG. 4, after the launch base 14 and the floating core 15 are loaded at one end of the hollow body cavity 10, mold clamping is performed.
Here, in a state where the launch base 14 and the floating core 15 are loaded at one end of the hollow body cavity 10, as shown in FIG. 4, the launch base is at one end (the lower end in FIG. 4) of the hollow body cavity 10. A first cavity K <b> 1 for forming the first engaging portion 6 is formed by the cooperation of 14 and the floating core 15.

  As shown in FIGS. 5 and 6, the launch base 14 includes a first cylindrical portion 16, an annular flat surface portion 17, a truncated cone portion 18, a second cylindrical portion 19, and a pressure hole 20. The outer peripheral surface of the first cylindrical portion 16 matches the inner peripheral surface of one end of the hollow body cavity 10. Therefore, when the launch base 14 is loaded at one end of the hollow body cavity 10, the first cylindrical portion 16 of the launch base 14 is fitted into one end of the hollow body cavity 10. An annular flat surface portion 17 is provided on the inner circumference of the upper surface of the first cylindrical portion 16. A truncated cone part 18 is provided inside the annular flat part 17. A second cylindrical portion 19 is provided on the upper surface of the truncated cone portion 18. Since the truncated cone part 18 is provided between the second cylindrical part 19 and the first cylindrical part 16, the outer diameter of the second cylindrical part 19 is smaller than the outer diameter of the first cylindrical part 16. A pressurizing hole 20 is penetrated on the rotation center axis of the launch base 14.

  As shown in FIGS. 8 to 10, the floating core 15 is installed on the launch base 14. The floating core 15 has a cylindrical portion 21 and a conical portion 22. The conical portion 22 is provided on the upper side of the cylindrical portion 21. On the other hand, a cylindrical recess 23 is provided on the bottom surface of the cylindrical portion 21. The cylindrical recess 23 is fitted to the second cylindrical portion 19 of the launch base 14.

  Therefore, the floating core 15 is installed on the launch base 14 by fitting the second cylindrical portion 19 of the launch base 14 and the cylindrical recess 23 of the floating core 15 together. When the floating core 15 is installed on the launch pedestal 14, the cylindrical recess 23 of the floating core 15 contacts the pressurizing hole 20 of the launch pedestal 14.

  When the launch base 14 and the floating core 15 are loaded into one end of the hollow body cavity 10 (see FIG. 4 above) and the mold is clamped, as shown in FIG. 11, the molten resin 24 is injected into the hollow body cavity 10. Filled. Thereafter, the fluid is press-fitted from the pressurizing hole 20 of the launch base 14.

  As shown in FIG. 12, the floating core 15 is moved from one end to the other end of the hollow body cavity 10 by the fluid injection. During the movement of the floating core 15, in the hollow cavity 10, the outer peripheral portion of the molten resin 24 that has started cooling and solidification is left on the inner peripheral wall, and the central portion of the molten resin 24 that is delayed in cooling is pushed out. Further, the shape of the outer peripheral portion of the molten resin 24 is maintained by being pressed against the inner peripheral wall of the hollow cavity 10 by the pressure of the fluid.

  When the molten resin 24 is solidified, the connected molded product 1 is taken out from the mold 9. As shown in FIG. 13, the first engagement portion 6 is formed at the one end opening 5 of the hollow body 2 constituting the connected molded product 1. More specifically, the first engaging portion 6 is formed with a convex portion 25 having a right triangle shape in cross section.

  The first engaging part 6 having the convex part 25 is formed at the one end part (the lower end part in FIG. 4) of the hollow body cavity 10 by the cooperation of the launch base 14 and the floating core 15. Inside, the molten resin 24 is filled and solidified to be molded.

[3. Summary]
From the above, in the injection molding apparatus 13 according to the first embodiment, the connected molded product 1 is in a state where the pipe-shaped hollow body 2 and the box 3 are connected by the integral hinge 4 (see FIG. 1 above). The mold 9 is integrally formed (see FIG. 3 above). In the case of integral molding, after the floating core 15 is installed on the launch base 14 (see FIG. 4 above), the floating core 15 moves from the launch base 14 to the hollow body cavity 10 of the mold 9 (see FIG. 11 above). And the said hollow body 2 is shape | molded (refer said FIG. 13).

  Furthermore, at one end (the left end in FIG. 4) of the hollow body cavity 10, the first cavity K 1 formed by the cooperation of the launch base 14 and the floating core 15 has a first end 5 at the one end opening 5 of the hollow body 2. The engaging portion 6 is formed (see FIG. 3 and FIGS. 11 to 13). Further, in the mold 9, the second engagement portion 7 is formed in the box 3 by the second cavity K2 formed in the side portion (left side portion in FIG. 3) of the box cavity 11 (see FIG. 1 and FIG. 1). (See FIG. 3 above). When the first engaging portion 6 is inserted into the second engaging portion 7, the convex portion 25 of the first engaging portion 6 is elastically engaged with the concave portion 8 of the second engaging portion 7. Thereby, the hollow body 2 and the box 3 are engaged and connected to each other.

  Therefore, in the connected molded product 1 manufactured by the injection molding apparatus 13 according to the first embodiment, the pipe-shaped hollow body 2 and the box 3 are connected by the integral hinge 4 (see FIG. 1 above), When the integral hinge 4 is bent, the first engaging portion 6 formed in the one end opening 5 of the hollow body 2 can be engaged with the second engaging portion 7 formed in the box 3 (described above). (See FIG. 2). As described above, since a part of the hollow body 2 does not remain inside the box 3 at the time of forming the connected molded product 1, a cutting process for cutting a part of the hollow body 2 as an unnecessary part is omitted. be able to.

  Furthermore, in the connection molded product 1 manufactured by the injection molding apparatus 13 according to the first embodiment, the first engagement portion 6 and the second engagement portion 7 are elastically engaged with each other, thereby the hollow body 2 and The box 3 can be assembled and joined easily and reliably.

  Further, in the injection molding apparatus 13 according to the first embodiment, the hollow body 2, the box 3 and the integral hinge 4 constituting the connected molded product 1 are integrally molded by the mold 9 (see FIGS. 1 and 3 above). reference). Accordingly, the mold size can be reduced and the amount of the injection resin can be reduced, so that costs such as equipment costs and material costs can be suppressed and productivity can be improved.

  Further, in the injection molding device 13 according to the first embodiment, the convex portion 25 is formed on the first engagement portion 6 in the one end opening 5 of the hollow body 2 (see FIG. 13 above), and is in the box 3. A concave portion 8 is formed in the second engaging portion 7 (see FIG. 1 above).

  In the joint molded product 1 manufactured by the injection molding apparatus 13 according to the first embodiment, when the first engaging portion 6 and the second engaging portion 7 are engaged, as shown in FIG. The hollow body 2 and the box body 3 are merely engaged with the convex portion 25 formed on the first engaging portion 6 and the concave portion 8 formed on the second engaging portion 7 only with respect to each other. Can be assembled and joined easily and reliably with a single touch, and the assembly joint can be further prevented from coming off.

[4. Second Embodiment]
The second embodiment will be described below. In addition, regarding the second embodiment, matters that are substantially common to the first embodiment may be omitted from the description using the drawings.

[4. -1 Linked molded product]
As shown in FIG. 15, the connected molded product 101 according to the second embodiment includes a pipe-shaped hollow body 102, a box 103 with one side opened (upper surface in FIGS. 15 and 16), and an integrator that connects the two. This is a resin molded product having a lug hinge 104 and manufactured by injection molding of a molten resin. The hollow body 102 is made of a three-dimensional bent pipe. The integral hinge 104 is a hinge that connects the hollow body 102 and the box body 103 and is bendable.

  The first engagement portion 106 of the convex portion 125 is provided along the inner surface of the one end opening portion 105 of the hollow body 102. On the side surface of the box body 103, a second engaging portion 107 is provided that protrudes in a cylindrical shape. An annular concave portion 108 is provided near the base of the outer peripheral surface of the second engagement portion 107. The second engagement portion 107 is provided with a slit S2.

  Further, three slits SS are provided at equal intervals in the one end opening 105 of the hollow body 102.

  As shown in FIG. 16, in the joint molded product 101 according to the second embodiment, the hollow body 102 and the box body 103 can be assembled and joined by bending the integral hinge 104 into a U shape. . When assembling and joining, the first engaging portion 106 formed in the one end opening 105 of the hollow body 102 is connected to the second engaging portion 107 with respect to the cylindrical second engaging portion 107 in the box 103. It is inserted from the outside. When the first engaging portion 106 is inserted into the second engaging portion 107, the convex portion 125 of the first engaging portion 106 is elastically engaged with the concave portion 108 of the second engaging portion 107.

  Further, when the first engagement portion 106 is inserted into the second engagement portion 107, the one end opening 105 of the hollow body 102 is expanded by each slit SS.

  In the connection molded product 1 according to the first embodiment, the integral hinge 4 is provided on the bottom surface of the box 3 (see FIG. 1 and FIG. 2 above), but the connection molding according to the second embodiment. In the product 101, an integral hinge 104 is provided on the side surface of the box body 103.

[4. -2 Injection molding device]
In order to manufacture the connected molded product 101 according to the second embodiment, the mold 109 shown in FIG. 17 is used. The mold 109 is provided with a hollow body cavity 110, a box body cavity 111 and a hinge cavity 112. The hollow body cavity 110 and the box body cavity 111 are communicated with each other via a hinge cavity 112.
In the mold 109, a second cavity K4 for forming a second engaging portion 107 described later is provided on the side portion (lower side portion in FIG. 17) of the box cavity 111.

  In the hollow body cavity 110, the hollow body 102 that is a three-dimensional bent pipe is formed. In the second cavity K4, the box 103 having one surface opened is formed. In the hinge cavity 112, the integral hinge 104 is formed.

  The mold 109 is provided in the injection molding apparatus 113 according to the second embodiment. In addition, regarding the injection molding apparatus 113 according to the second embodiment, a known technique (for example, a liner that fills each cavity of the mold 109 with a resin, and a resin that is extruded when the hollow body 102 is molded, except for matters specifying the present invention. The description of the escape configuration etc. is omitted.

  Hereinafter, a method for forming the first engaging portion 106 in the one-end opening 105 of the hollow body 102 will be described. When the first engagement portion 106 provided in the one end opening 105 of the hollow body 102 is molded by the mold 109, the box 103 and the integral hinge 104 are also molded by the mold 109 at the same time. That is, in the mold 109, the connected molded product 101 is integrally molded. However, the molding technique of the box 103 and the integral hinge 104 is a known technique, and thus the description thereof is omitted.

In the injection molding apparatus 113 according to the second embodiment, as shown in FIG. 18, after the launch base 114 and the floating core 115 are loaded on one end of the hollow body cavity 110, mold clamping is performed.
Here, in a state where the launch base 114 and the floating core 115 are loaded at one end of the hollow body cavity 110, as shown in FIG. 18, the launch base is at one end (the lower end in FIG. 18) of the hollow body cavity 110. A first cavity K <b> 3 for forming the first engaging portion 6 is formed by the cooperation of 114 and the floating core 115.

  As shown in FIG. 19, the launch base 114 includes a first cylindrical portion 116, an annular flat surface portion 117, a truncated cone portion 118, a second cylindrical portion 119, and a pressure hole 120. The outer peripheral surface of the first cylindrical portion 116 matches the inner peripheral surface of one end of the hollow body cavity 110. Accordingly, when the launch base 114 is loaded at one end of the hollow body cavity 110, the first cylindrical portion 116 of the launch base 114 is fitted into one end of the hollow body cavity 110. An annular flat surface portion 117 is provided on the inner circumference of the upper surface of the first cylindrical portion 116. A truncated cone part 118 is provided inside the annular flat part 117. A second cylindrical portion 119 is provided on the upper surface of the truncated cone portion 118. Since the truncated cone part 118 is provided between the second cylindrical part 119 and the first cylindrical part 116, the outer diameter of the second cylindrical part 119 is smaller than the outer diameter of the first cylindrical part 116. A pressurizing hole 120 is penetrated on the rotation center axis of the launch base 114.

  Further, on the launch base 114, three projecting pieces P are erected on the annular flat surface portion 117 at equal intervals. The vicinity of the base of each projecting piece P projects along the truncated cone portion 118. The outer peripheral surface of each projecting piece P is flush with the outer peripheral surface of the first cylindrical portion 116. Therefore, the outer peripheral surface of each projecting piece P matches the inner peripheral surface of one end of the hollow body cavity 110.

  As shown in FIGS. 20 and 21, the floating core 115 is installed on the launch base 114. The floating core 115 has a cylindrical portion 121 and a conical portion 122. The conical part 122 is provided on the upper surface of the cylindrical part 121. On the other hand, a cylindrical concave portion 123 is provided on the bottom surface of the cylindrical portion 121. The cylindrical recess 123 is fitted with the second cylindrical portion 119 of the launch base 114.

  Therefore, the floating core 115 is installed on the launch base 114 by fitting the second cylindrical portion 119 of the launch base 114 and the cylindrical recess 123 of the floating core 115 together. When the floating core 115 is installed on the launch base 114, the cylindrical recess 123 of the floating core 115 is in contact with the pressure hole 120 of the launch base 114.

  Furthermore, the bottom surface of the cylindrical portion 121 included in the floating core 115 is provided with a tapered surface that extends upward toward the cylindrical portion 121 around the cylindrical concave portion 123. Further, when the floating core 115 is installed on the launch pedestal 114, the cylindrical portion 121 of the floating core 115 is fitted to each projecting piece P of the launch pedestal 114.

  When the launch base 114 and the floating core 115 are loaded into one end of the hollow body cavity 110 (see FIG. 18) and the mold is clamped, the hollow body cavity is the same as in the first embodiment (see FIG. 11). 110 is injected and filled with molten resin. Thereafter, the fluid is press-fitted from the pressurizing hole 120 of the launch base 114.

  The floating core 115 is moved from one end to the other end of the hollow body cavity 110 in the same manner as in the first embodiment (see FIG. 12) by fluid injection. During the movement of the floating core 115, in the hollow cavity 110, the outer peripheral portion of the molten resin that has started to be cooled and solidified is left on the inner peripheral wall, and the central portion of the molten resin that is delayed in cooling is extruded. Further, the outer peripheral portion of the molten resin is pressed against the inner wall of the hollow cavity 110 by the pressure of the fluid, so that the shape thereof is maintained.

  When the molten resin is solidified, the connected molded product 101 is taken out from the mold 109. In the one end opening 105 of the hollow body 102 constituting the connected molded product 101, the first engaging portion 106 is formed as shown in FIG. More specifically, the first engaging portion 106 is formed with a convex portion 125 having a cross section of an isosceles triangle as shown in FIG.

  The first engaging part 106 having the convex part 125 is formed at the one end part (lower end part in FIG. 18) of the hollow body cavity 110 by the cooperation of the launch base 114 and the floating core 115. Inside, the molten resin 24 is filled and solidified to be molded.

  Further, in the first engaging portion 106, each slit SS is formed by each projecting piece P of the launch base 114, as shown in FIG. 15 and FIG.

  In the connection molded product 1 according to the first embodiment, the cross section of the convex portion 25 of the first engagement portion 6 is a right triangle (see FIG. 13), but the connection molding according to the second embodiment. In the product 101, the cross section of the convex portion 125 of the first engaging portion 106 is an isosceles triangle.

[4. -3 Summary]
As described above, in the injection molding apparatus 113 according to the second embodiment, the connected molded product 101 is a state where the resin pipe-shaped hollow body 102 and the resin box 103 are connected by the resin integral hinge 104. (See FIG. 15 above), the die 109 is integrally formed (see FIG. 17 above). At the time of integral molding, after the floating core 115 is installed on the launch base 114 (see FIG. 18 above), the floating core 115 moves from the launch base 114 to the hollow body cavity 110 of the mold 109, whereby the hollow body 102. Is formed.

  Furthermore, at one end (the lower end in FIG. 18) of the hollow body cavity 110, the first cavity K <b> 3 formed by the cooperation of the launch base 14 and the floating core 15 has the first end 5 in the hollow body 2. The engaging portion 6 is formed (see FIGS. 15 and 17). Further, in the mold 109, the second engagement portion 107 is formed into the box body 103 by the second cavity K4 formed in the side portion (lower side portion in FIG. 17) of the box cavity 111 (FIG. 15 above). And FIG. 17 above). When the first engaging portion 106 is inserted into the second engaging portion 107, the convex portion 125 of the first engaging portion 106 is elastically engaged with the concave portion 108 of the second engaging portion 107. Thereby, the hollow body 2 and the box 3 are engaged and connected to each other.

  Therefore, in the connection molded product 101 manufactured by the injection molding apparatus 113 according to the second embodiment, the resin pipe-shaped hollow body 102 and the resin box 103 are connected by the resin integral hinge 104. When the integral hinge 104 is bent (see FIG. 15 above), the first engaging portion 106 formed in the one end opening 105 of the hollow body 102 and the second engaging portion 107 formed in the box 103 are formed. It can be engaged (see FIG. 16 above). As described above, since a part of the hollow body 102 does not remain inside the box body 103 when the connected molded product 101 is molded, a cutting process for cutting a part of the hollow body 102 as an unnecessary part is omitted. It is possible.

  Further, in the joint molded product 101 manufactured by the injection molding apparatus 113 according to the second embodiment, the first engagement portion 106 and the second engagement portion 107 are elastically engaged with each other, The box body 103 can be assembled and joined easily and reliably.

  Further, in the injection molding apparatus 113 according to the second embodiment, the hollow body 102, the box body 103, and the integral hinge 104 constituting the connected molded product 101 are integrally molded by the mold 109 (see FIGS. 15 and 17 above). reference). Accordingly, the mold size can be reduced and the amount of the injection resin can be reduced, so that costs such as equipment costs and material costs can be suppressed and productivity can be improved.

  Further, in the injection molding apparatus 113 according to the second embodiment, the convex portion 125 is formed on the first engagement portion 106 in the one end opening 105 of the hollow body 102 (see FIG. 22 above), and is in the box body 103. A concave portion 108 is formed in the second engagement portion 107 (see FIG. 15 above).

  Therefore, in the joint molded product 101 manufactured by the injection molding apparatus 113 according to the second embodiment, when the first engagement portion 106 and the second engagement portion 107 are engaged, the relationship is shown in FIG. As described above, the convex portion 125 formed on the first engaging portion 106 and the concave portion 108 formed on the second engaging portion 107 are merely engaged with each other only in the concave-convex relationship. The box body 103 can be assembled and joined more easily and reliably with a single touch, and the assembly joint can be further prevented from coming off.

  Further, in the injection molding apparatus 113 according to the second embodiment, each of the slits SS is formed in the one end opening 105 of the hollow body 102 by each protrusion P provided on the launch base 114 (see FIG. 19 and FIG. 20). Molded (see FIG. 15 and FIG. 16).

  Therefore, in the joint molded product 101 manufactured by the injection molding apparatus 113 according to the second embodiment, when the first engaging portion 106 and the second engaging portion 107 are engaged, one end opening of the hollow body 102 is opened. Each slit SS formed in the portion 105 expands the first engaging portion 106 formed in the one end opening 105 of the hollow body 102, so that the hollow body 102 and the box 103 can be more easily and reliably assembled. Can be attached.

[5. Modified example]
In addition, this invention is not limited to said each Embodiment 1 and 2, A various change is possible in the range which does not deviate from the meaning.
For example, in the injection molding apparatuses 13 and 113 described above, the launch bases 14 and 114 and the floating cores 15 and 115 are loaded at one end of the hollow body cavities 10 and 110 (see, for example, FIG. 4 and FIG. 18 above).

  However, instead of such loading, the annular flat portions 17 and 117 of the launch bases 14 and 114 may be pressed against the molds 9 and 109 forming one end of the hollow cavities 10 and 110. In this modification, the truncated cone portions 18 and 118 and the second cylindrical portions 19 and 119 of the launch bases 14 and 114 are inserted into one end of the hollow body cavities 10 and 110, and the floating cores 15 and 115 are also inserted. .

  Furthermore, in this modification, in the case where the truncated cone portion 118 and the second cylindrical portion 119 of the launch base 114 are inserted into one end of the hollow body cavity 110, each notch into which each projecting piece P of the launch base 114 is fitted. The part is formed on the mold 109 (the inner wall at one end of the hollow body cavity 110).

DESCRIPTION OF SYMBOLS 1,101 Connection molded product 2,102 Hollow body 3,103 Box body 4,104 Integral hinge 5,105 One end opening part 6,106 of a hollow body First engagement part 7,107 Second engagement part 8,108 Concave part 9, 109 Mold 10, 110 Hollow cavity 11, 111 Box cavity 12, 112 Hinge cavity 13, 113 Injection molding device 14, 114 Firing base 15, 115 Floating core 25, 125 Convex part SS Slit P Projection Fragment

Claims (6)

Hollow body cavity for molding the pipe-like hollow body has a hinge cavity for molding a hinge connecting the box body and box body cavity and the hollow body with one side forming the opened box body, said hollow body cavity, the box body cavity and the hinge cavity and mold communicate with each other,
The emitted from the hollow body projectile base disposed at one end of the cavity, and a floating core by extruding a resin for molding the hollow body while moving the resin filled in the hollow body cavity,
Provided inside the hollow body cavity, the surrounded by firing pedestal and said floating core, a first cavity for molding the first engaging portion at one end of the hollow body,
Provided in the mold, injection molding apparatus continuously in the box body cavity, characterized in that a second cavity for molding the second engaging portion engaged with the first engaging portion. An injection molding apparatus according to claim 1,
The first cavity is formed with a convex portion on the first engaging portion,
2. The injection molding apparatus according to claim 1, wherein the second cavity forms a concave portion that engages with the convex portion in the second engaging portion. An injection molding apparatus according to claim 1 or claim 2,
2. An injection molding apparatus according to claim 1, wherein the launch base is provided with a projecting piece that forms a slit at one end of the hollow body. A pipe-shaped hollow body;
A box with one side open,
A hinge connecting the hollow body and the box;
A first engagement portion formed at one end of the hollow body;
A second engagement portion formed on the box and engageable with the first engagement portion;
The hollow body and the box body are integrated with each other by engaging the first engagement portion and the second engagement portion in a state of being connected via the hinge. Connected molded product. A connected molded product according to claim 4,
A convex portion formed in the first engaging portion;
A connected molded product comprising: a concave portion that is formed in the second engaging portion and engages with a convex portion of the first engaging portion. A connected molded product according to claim 4 or claim 5,
A connected molded product comprising a slit formed at one end of the hollow body.

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