JP2018130914A - Injection mold of rod-like molded article, and manufacturing method of rod-like molded article - Google Patents

Abstract

The present invention provides a technique capable of injection-molding a rod-shaped molded body having a threaded portion and a notched portion at a time.
An injection mold for injection-molding a rod-shaped molded body, wherein the rod-shaped molded body includes a screw portion and a cutout portion on at least a part of the outer surface, and the injection mold includes at least a screw. A first cavity mold that defines the shape of the part, a first slide mold that forms the notch, and a second cavity mold that defines at least a part of the part other than the part defined by the first cavity mold. The first cavity mold is configured to be rotatable, and the first slide mold is provided to be slidable in a slit provided in a part of the first cavity mold, and when the mold is closed The first slide mold penetrates the slit and the rotation of the first cavity mold is prevented, and when the mold is opened, the slide mold is extracted from the first cavity mold and the first cavity mold can be rotated. It is configured so as to be.
[Selection] Figure 1

Description

  The present invention relates to an injection mold for a rod-shaped molded body and a method for producing the rod-shaped molded body. In particular, the present invention relates to a method for manufacturing a rod-shaped molded body using injection molding and an injection mold used for injection molding.

  The rod-shaped molded body is used for various purposes. A hollow rod-shaped molded body (that is, a tubular molded body) is used for a connector member of a hose or a tube, for example. Moreover, a tubular molded body can also be used as a filter member (strainer) by providing a window part in the tube wall of a tubular molded body, and integrating a mesh with a window part. If a tubular resin molded body is manufactured using synthetic resin injection molding, the manufacturing efficiency is high and economical.

  For example, Patent Literature 1 discloses a technique in which a plurality of windows are provided in a synthetic resin cylinder, and a filter net (mesh) is provided in the windows to form a strainer. The strainer includes a stopper flange. And a technique in which an annular seal rib is integrally formed. According to the strainer, it is disclosed that the fuel tank can be easily attached to the fuel tank and the fuel can be reliably filtered.

Japanese Utility Model Publication No. 53-154916

  A strainer as disclosed in Patent Document 1 is provided with a screw portion, a nut portion, a seal groove, an annular rib for retaining, etc., based on various requests such as convenience of installation work and sealing performance. There is. For example, as shown in FIG. 8, a tubular resin molded body 9 that is a filter member has a hollow tubular portion 91, a window portion 93 integrated with a mesh, and a screw portion 94, and an O-shaped flange portion. A seal groove 95 into which the ring is fitted needs to be provided.

  However, the injection molding process of the tubular resin molded body 9 in FIG. 8 is complicated. The mold of the seal groove 95 is desired to have a mold structure that can be demolded along the axial direction of the tube so as not to cause burrs or the like. On the other hand, the mold of the portion of the window portion 93 including the mesh needs to have a mold structure using a slide mold that can advance and retreat in the radial direction of the tube. Furthermore, since the threaded portion 94 cannot be removed directly in the axial direction, it is necessary to use a slide mold or the like for this portion. Even when trying to realize a mold by combining the slide structures of the prior art, any of the slide structures cannot be realized, and such a complicated shape cannot be integrally formed.

  Therefore, in the injection molding of the tubular resin molded body 9 of FIG. 8, first, only the portion 98 including the window portion 93 and the screw portion 94 (the portion with the right-down hatching in the cross section) is once injection molded. Then, the obtained portion 98 is used as an insert member, and the remaining portion 99 including the seal groove 95 (the portion with the cross-section hatched to the right) is injection-molded, so-called two-time molding or two-color molding. It was necessary to perform molding by a method called Such a manufacturing method requires a plurality of molds and requires an injection molding step twice, which is complicated and uneconomical.

  The objective of this invention is providing the technique which solves the above-mentioned subject.

In order to achieve the above object, the mold according to the present invention is:
An injection mold for injection molding a rod-shaped molded body,
The rod-shaped molded body is
At least a part of the outer surface is provided with a screw part and a notch part,
The injection mold is
A first cavity mold that defines at least the shape of the thread portion;
A first slide mold for forming the notch,
A second cavity mold that defines at least a part of a part other than the part defined by the first cavity mold,
The first cavity mold is configured to be rotatable,
The first slide mold is provided to be slidable in a slit provided in a part of the first cavity mold,
When the mold is closed, the first slide mold passes through the slit, and rotation of the first cavity mold is prevented.
When the mold is opened, the slide mold is extracted from the first cavity mold, and the injection mold is configured such that the first cavity mold can be rotated.

In order to achieve the above object, the method according to the present invention comprises:
A method for producing the rod-shaped molded body using the injection mold described above,
Closing the mold with the first slide mold penetrating the first cavity mold;
Injecting resin into the cavity of the closed injection mold to solidify the resin, and forming a rod-shaped molded body inside the mold;
After the first slide mold is moved so as to be extracted from the first cavity mold, the first cavity mold is rotated to remove the threaded portion of the outer surface of the formed rod-shaped molded body from the first cavity mold. Molding process;
Have

  According to the injection mold of the present invention and the manufacturing method using the mold, a rod-shaped molded body having a threaded portion and a notched portion can be injection-molded at one time, which is efficient and economical. Manufacturing can be realized.

It is a partial cross section figure which shows the shape of the tubular resin molding manufactured by the metal mold | die and manufacturing method of 1st Embodiment. It is a figure which shows the example of the usage condition of a tubular resin molding. It is a cross-sectional schematic diagram which shows the injection mold of 1st Embodiment for shape | molding a tubular resin molding. It is a cross-sectional schematic diagram which shows a part of process of demolding the tubular resin molding formed with the injection mold of 1st Embodiment. It is a cross-sectional schematic diagram which shows a part of process of demolding the tubular resin molding formed with the injection mold of 1st Embodiment. It is a cross-sectional schematic diagram which shows a part of process of demolding the tubular resin molding formed with the injection mold of 1st Embodiment. It is a cross-sectional schematic diagram which shows a part of process of demolding the tubular resin molding formed with the injection mold of 1st Embodiment. It is a partial cross section figure which shows the shape and structure of the tubular resin molding manufactured with the conventional metal mold | die and the manufacturing method. It is a cross-sectional schematic diagram which shows the YY cross section of the injection mold of 1st Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example a tubular resin molded body used as a filter member for filtering fuel. Note that the present invention is not limited to the individual embodiments described below, and the embodiments can be changed and implemented.
In addition, although the tubular resin molded body is demonstrated in the following embodiment, the molded object which this invention manufactures should just be a rod-shaped molded object irrespective of hollow and solid.

FIG. 1 is a partially sectional view showing a tubular resin molded body 1 manufactured using an injection mold as an embodiment of the present invention. In FIG. 1, the upper side from the central axis m of the tube is shown in cross section, and the lower side from the central axis m of the tube is shown in appearance.
The tubular resin molded body 1 of the present embodiment can be used as a liquid filter member such as fuel. The tubular resin molded body 1 has a hollow tubular portion 11, and the hollow tubular portion 11 is a straight tube having a through hole reaching from one end to the other end. The shape of the tube is a cylindrical tube in this embodiment, but may be a polygonal tube, for example, a square tube. One end of the hollow tubular portion 11 is released, while a lid portion 12 is provided at the other end of the hollow tubular portion 11, and the end of the hollow tubular portion 11 is closed on the lid portion 12 side.

  Windows 13 and 13 are provided on the side of the hollow tubular portion 11 close to the lid portion 12. The window portion 13 is a portion that communicates the inside and outside of the tube of the hollow tubular portion 11 in the radial direction. In this embodiment, the two window parts 13 and 13 are provided in the shape of a rectangle long in the central axis direction. The number of windows and the arrangement in the circumferential direction of the tube are not particularly limited. A mesh 19 is integrated with the window 13 so as to cover the window 13. The integration is preferably performed by insert injection molding using a mesh material as an insert member as will be described later. With such a configuration, for example, the liquid that has flowed into the tubular resin molded body 1 can be filtered through the mesh 19 and poured out of the tubular resin molded body 1.

  The tubular resin molded body 1 has a screw portion 14 so as to surround the hollow tubular portion 11 in the circumferential direction. The screw portion 14 has a male screw formed on the outer surface of the molded body. The tubular resin molded body 1 can be fixed by screwing the tubular resin molded body 1 by rotating the tubular resin molded body 1 around the central axis m. The screw portion 14 is provided at a position farther from the lid portion 12 than the window portion 13.

  Although not essential, the tubular resin molded body 1 may include a flange portion 18, a nut portion 16, and a bulging portion 17 on the outer periphery of the hollow tubular portion 11. If the flange portion 18 is provided adjacent to the screw portion 14, the tubular resin molded body 1 can be attached or fixed using the screw portion 14 or the flange portion 18, which is preferable. Further, if the nut portion 16 is provided, for example, in the shape of a square column or a hexagonal column so as to surround the hollow tubular portion 11, a tightening operation is performed using the nut portion 16 when the tubular resin molded body 1 is screwed and attached. Can be convenient. Further, the bulging portion 17 can be provided, for example, at the end of the hollow tubular portion 11 on the side opposite to the lid portion 12, and the bulging portion 17 is provided so as to cover the end of the hollow tubular portion 11. This is convenient because it can be used as a seal for rubber pipes that have been removed or to prevent them from coming off.

  In the tubular resin molded body 1 of the present embodiment, the lid portion 12, the window portions 13 and 13, the screw portion 14, the flange portion 18, the nut portion 16, and the bulging portion 17 with respect to the hollow tubular portion 11 are in the central axis m direction. Are arranged in this order. The flange portion 18, the nut portion 16, the bulging portion 17 and the like may be omitted as appropriate, or the arrangement order may be replaced with other elements. Moreover, you may add the part of another shape to the tubular resin molding 1 as needed.

  When the flange portion 18 is provided adjacent to the screw portion 14 as in this embodiment, it is preferable to provide an annular seal groove 15 on the end surface of the flange portion on the screw portion side. Here, the side end surface of the flange portion is a surface perpendicular to the longitudinal direction (center axis) of the tubular resin molded body 1. If an O-ring is fitted in the seal groove 15, when the tubular resin molded body 1 is screwed and attached using the screw portion 14, a seal can be performed between the flange portion 18 and the mating member.

  It does not specifically limit as a synthetic resin material which comprises the tubular resin molding 1, Various synthetic resins which can be injection-molded can be used. Preferably, an olefin resin such as a polypropylene resin, a thermoplastic resin such as a polyamide resin or an acrylonitrile butadiene styrene resin, a thermosetting resin such as a melamine resin, rubber, a thermoplastic elastomer, or the like can be used. The tubular resin molded body 1 of this embodiment is formed of a polyamide resin. The tubular resin molded body 1 is formed by injection molding as will be described later, but other molding methods such as cutting and welding may be used in combination as necessary.

  The mesh 19 integrated with the window parts 13 and 13 of the tubular resin molded body 1 will be described. The material of the mesh 19 may be made of metal or resin. The mesh may have a net-like shape knitted with a wire, or may have a shape in which a large number of holes are provided in a plate or a film. The mesh may be individually integrated with each window. As in the present embodiment, the mesh 19 is integrated with the inner peripheral surface of the hollow tubular portion 11 in a cylindrical state, and the mesh is exposed to the outside at the portion of the window portion 13, and the window portion 13 is meshed. It may be integrated so as to be covered with. When the mesh 19 is cylindrical, it is preferable that both end portions of the mesh material are embedded in the columnar portion of the hollow tubular portion 11 sandwiched between the window portions 13 and 13.

  As shown in FIG. 2, the tubular resin molded body 1 is used by being screwed into a mounting hole provided in the fuel tank 2 using a screw portion 14 with the O-ring 3 mounted in the seal groove 15. Provided. The female screw provided in the attachment hole and the male screw of the screw portion 14 are screwed together, and the tubular resin molded body 1 is attached to the fuel tank 2. Since the portion of the hollow tubular portion 11 on the side having the bulging portion 17 protrudes to the outside of the fuel tank in the attached state, piping such as a rubber tube can be attached to this portion. By being piped in this way, the tubular resin molded body 1 functions as a filter member that filters the fuel flowing between the inside of the fuel tank and the rubber tube with a mesh.

A method for producing the tubular resin molded body 1 will be described. The tubular resin molded body 1 is formed using synthetic resin injection molding (insert molding) using the mesh 19 as an insert member. In FIG. 3, the injection mold used for shaping | molding of the tubular resin molding 1 is shown with the schematic diagram of the cross section in the surface containing the centerline m of a hollow tubular part. FIG. 3 shows a state where the mold is closed. 3 to 7, in order to make the drawings easy to see, only a part of the mold (first cavity mold 41 and first slide mold 42) is hatched in cross section, and others. In this part, hatching attached to the cross section of the mold is omitted.
The injection mold shown in FIG. 3 is such that the upper side of the figure is the fixed side mold 4 and the lower side of the figure is the moving side mold 5 so that the mold opens and closes in the vertical direction of the figure. Installed in injection molding machine. The tubular resin molded body 1 is placed in a posture such that the opening / closing direction (vertical direction in the figure) of the stationary mold 4 and the moving mold 5 coincides with the center line m of the pipe by the cavity C of the mold. It is formed. In FIG. 3, description of gates, runners, sprues, opening / closing guide pins and opening / closing mechanisms, drive mechanisms such as slides, projecting pins of molded bodies, cooling water circuits, and the like, which injection molds normally have, is omitted. However, these are provided as needed.

  The stationary mold 4 includes a stationary mold plate 40, a first cavity mold 41, and first slide molds 42 and 42. On the other hand, the moving-side mold 5 includes a moving-side mold plate 50, a core pin 51, and second slide molds 52 and 52. In the mold of this embodiment, a cavity C is formed by the first cavity mold 41, the first slide molds 42, 42, the core pin 51, and the second slide molds 52, 52.

  The core pin 51 defines at least the inner peripheral surface shape of the hollow tubular portion 11 of the tubular resin molded body 1. The core pin 51 may define other portions, for example, the shape of the end surface of the tubular resin molded body 1. The first cavity mold 41 defines at least the shape of the screw portion 14 in the outer surface shape of the hollow tubular portion 11. You may make it the 1st cavity type | mold 41 prescribe | regulate the shape of another part, for example, the part around the window parts 13 and 13. FIG. Although not essential, the shape of the seal groove 15 can be defined by the end face of the first cavity mold 41 as in the present embodiment.

  The first slide molds 42, 42 form the window portion 13 in the hollow tubular portion 11 in cooperation with the core pin 51. That is, when the mold is closed, the distal end portions of the first slide molds 42 and 42 and the outer surface of the core pin 51 are disposed in close proximity to each other, and the injected resin is prevented from entering the facing portion, thereby the window portion 13. , 13 are formed. In the present embodiment, the mesh 19 is sandwiched between the distal end portions of the first slide molds 42 and 42 and the outer surface of the core pin 51 so that the mesh 19 is integrated with the window portions 13 and 13. In the tubular resin molded body 1, this portion becomes the window portions 13 and 13, and the mesh 19 is disposed in the window portion 13. FIG. 9 shows a YY cross section of the fixed mold 4 when the mold is closed using the mesh 19 as an insert. The first slide type does not need to be used for forming only the window portion, and may define the shape of other portions. For example, the first slide type may be a hollow tube around the window portions 13 and 13 by the first slide type. You may prescribe | regulate the outer peripheral surface shape of a part.

  The second slide molds 52, 52 provided in the moving-side mold 5 are second cavities that define at least a part of the outer peripheral surface shape of the hollow tubular portion 11 other than the part defined by the first cavity mold 41. Functions as a mold. In the present embodiment, the second slide molds 52, 52 as the second cavity molds define the outer peripheral surface shapes of the flange portion 18, the nut portion 16, and the bulging portion 17.

  In the present embodiment, the tubular resin molded body 1 has a bulging portion 17 that is undercut when the mold is removed in the direction of the axis m of the hollow tubular portion 11 on the side opposite to the window portion 13 with respect to the screw portion 14. doing. Therefore, the second cavity mold is configured as a slide mold (52, 52) that can be opened in the radial direction of the hollow tubular portion 11 so as to eliminate an undercut when the bulging portion 17 is removed. However, if the portion formed by the second cavity mold has a shape that can be removed in the direction of the axis m of the hollow tubular portion 11, it is not necessary to configure the second cavity mold as a slide mold. Further, it is not always necessary to configure the entire second cavity mold as a slide mold. For example, the second cavity mold has a slide mold that can be opened in the radial direction of the hollow tubular portion as a part thereof. It is good.

  The first cavity mold 41 is configured to be rotatable around the axis m of the hollow tubular portion 11 in the injection mold, and is attached to the fixed-side mold plate 40. The first cavity mold 41 is provided with a drive mechanism (not shown) that drives rotation around the axis m. The drive mechanism may have a hydraulic motor or may have an electric motor.

  The first slide molds 42 and 42 are provided so as to be able to advance and retract in the radial direction of the hollow tubular portion 11 with respect to the fixed-side mold plate 40. Further, the first slide molds 42 and 42 are provided so as to penetrate the first cavity mold 41. That is, the first cavity mold 41 is provided with a through hole penetrating the inside and outside of the mold in the radial direction. The first slide molds 42 and 42 are inserted through the through hole in a hollow shape so that the first cavity mold 41 is closed when the mold is closed. The tip portions of the slide dies 42, 42 are projected inside the first cavity die 41.

  That is, when the mold is closed, the first slide molds 42, 42 pass through the first cavity mold 41, the front ends of the first slide molds 42, 42 face the core pin 51, and the first The one-cavity mold 41 is configured to be prevented from rotating. The mold is configured such that when the mold is opened, the first slide molds 42 and 42 are extracted from the first cavity mold 41 so that the first cavity mold 41 can be rotated.

A series of steps in which the tubular resin molded body 1 is injection molded using the above-described injection mold will be described with reference to the drawings as necessary.
First, an injection mold as described above is prepared. Next, the prepared mold is closed (FIG. 3). At the time of mold closing, the first slide molds 42, 42 pass through the first cavity mold 41, and the molds are closed so that the front ends of the first slide molds 42, 42 face the core pin 51. The cylindrical mesh 19 is closed with the core pin 51 mounted at a predetermined position, and the mesh 19 is sandwiched between the tip portions of the first slide molds 42 and 42 and the core pin 51 (see FIG. In 9), it is placed in the cavity C so that the mesh 19 is insert-molded.

  Next, a liquid resin is injected into the cavity C to solidify the resin, and the tubular resin molded body 1 can be formed inside the mold. The injection and solidification of the resin may be performed by a known technique according to the type of resin.

After the resin is solidified, the mold is opened by the following procedure to take out the tubular resin molded body 1.
First, as shown in FIG. 4, the first slide molds 42, 42 are moved backward so as to be extracted from the first cavity mold 41. In FIG. 4, the backward movement operation is indicated by a white arrow. Thereby, the portions of the windows 13 and 13 are removed from the mold, and the undercut of these portions is eliminated, and the first cavity mold 41 can be rotated around the axis m.

Next, as shown in FIG. 5, the first cavity mold 41 is rotated to remove the threaded portion 14 of the formed tubular resin molded body from the first cavity mold 41. In FIG. 5, the rotation operation is indicated by an arc-shaped arrow. The rotation only needs to be performed to remove the screw part 14. Preferably, the relative movement of the first cavity mold 41 and the moving-side mold 5 (moving-side mold plate 50) in the direction of the axis m when the mold is opened is synchronized with the screw lead and pitch of the screw portion. The first cavity mold 41 is rotated. In FIG. 5, the movement of the first cavity mold 41 in the direction of the axis m is indicated by a white arrow.
If the screw portion 14 can be removed, the tubular resin molded body 1 can be easily removed from the first cavity mold in the direction of the axis m.

Next, the second cavity mold (second slide molds 52, 52) side is removed. As shown in FIG. 6, the second slide molds 52, 52 are moved in the radial direction of the hollow tubular portion 11 to eliminate the undercut. In FIG. 6, this movement is indicated by a white arrow.
Thereafter, as shown in FIG. 7, if the tubular resin molded body 1 is taken out from the second cavity mold (second slide molds 52, 52) along the core pin 51 using a protruding pin (not shown) or the like. Good. When the protruding pin is provided, it can be preferably provided as a release sleeve pin so as to surround the core pin 51. When the second cavity mold is a mold that does not have a slide mold, the step of opening the second slide molds 52 and 52 in FIG. 6 is omitted, and the tubular resin molded body 1 is immediately removed from the second cavity mold. Just take it out.
The tubular resin molded body 1 can be obtained by the above manufacturing method.

The operation and effect of this embodiment will be described.
The injection mold of the above embodiment is configured such that the first cavity mold 41 can rotate around the axis m of the hollow tubular portion in the injection mold, and the first slide molds 42 and 42 are the first. The hollow tubular portion is provided so as to advance and retreat in the radial direction so as to penetrate the cavity mold 41. When the mold is closed, the first slide molds 42, 42 pass through the first cavity mold 41, and the front ends of the first slide molds 42, 42 face the core pin 51. The first cavity mold 41 is prevented from rotating. Further, when the mold is opened, the first slide molds 42 and 42 are extracted from the first cavity mold 41 so that the first cavity mold can be rotated. ing. Therefore, the hollow tubular part provided with the screw part 14 and the window part 13 can be injection-molded at a time and removed from the mold without forcibly removing it.

  According to the conventional mold, the tubular resin molded body 1 having the screw part 14, the window part 13, and the seal groove 15 as shown in FIG. The structure was not established and could not be realized. Therefore, the conventional mold needs to be molded twice (or two-color molding) like the tubular resin molded body 9 of FIG. 8, which is inefficient and uneconomical. If the injection molding die of the above embodiment is used, the tubular resin molded body 1 having a complicated shape as shown in FIG. 1 can be integrally formed by one injection molding and can be easily removed, which is efficient. Economical.

  Moreover, after performing injection molding using the metal mold | die of the said embodiment and moving so that the 1st slide type | molds 42 and 42 may be extracted from the 1st cavity type | mold 41 at the time of mold removal of a molded object, after 1st, When the cavity mold 41 is rotated and the threaded portion 14 of the formed tubular resin molded body 1 is removed from the first cavity mold 41, the window portion 13 and the threaded portion of the tubular resin molded body 1 are obtained. 14 can be easily removed from the mold. The production of the tubular resin molded body 1 becomes efficient and economical.

  Moreover, when the tubular resin molding 1 has the bulging part 17 like the embodiment mentioned above, the 2nd cavity type | mold which forms a bulging part like the metal mold | die of the said embodiment is a bulging part. If it is configured as a slide type (second slide molds 52, 52) that can be opened in the radial direction of the hollow tubular part so as to eliminate the undercut of 17, the side on which the bulging part 17 is provided without difficulty. Even a tubular resin molded body having a complicated shape can be removed from the mold, and can be injection-molded once and removed.

  When the tubular resin molded body 1 has the bulging portion 17 as in the above-described embodiment, the second cavity mold forming the bulging portion is a hollow tubular shape so as to eliminate the undercut of the bulging portion. If the second slide mold that can be opened in the radial direction of the portion is provided, the side on which the bulging portion 17 is provided can be removed without difficulty, as in the mold of the above-described embodiment, and a complicated shape Even if it is a tubular resin molding, it can be injection-molded once and demolded.

  Furthermore, if the mesh 19 is integrated with the window portion 13 so as to cover the window portion as in the above embodiment, the obtained tubular resin molded body 1 is a filter member in which a mesh is provided in the window portion. Therefore, such a mold and a manufacturing method are particularly suitable for manufacturing a tubular filter member.

  The present invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above embodiment will be mainly described, and detailed descriptions of the same portions will be omitted. Moreover, these embodiments can be implemented by combining some of them or replacing some of them.

  In the said embodiment, although the tubular resin molding 1 demonstrated the case where it was a filter member by which the mesh 19 was integrated with the window part 13, when a tubular resin molding is not a filter member, it is a mesh at a window part. There is no need. That is, the mesh is not essential. When the mesh is not insert-molded, the front end surface of the first slide molds 42, 42 comes into contact with the outer peripheral surface of the core mold 51 when the mold is closed, so that the window portion 13 is formed.

  In the above embodiment, only one of the injection molds (fixed side mold 4) is provided with a rotatable first cavity mold 41 and first slide molds 42 and 42 penetrating the first cavity mold. However, the movable cavity mold 5 may be provided with a set of such a rotatable cavity mold and a slide mold that penetrates the rotatable cavity mold. The stationary mold 4 and the movable mold 5 It may be provided on both sides.

  Further, the tubular resin molded body according to the present invention may have a form in which the hollow tubular portion is integrated with the cap, and other members may be integrally formed with the hollow tubular portion. Moreover, according to the function calculated | required by the hollow tubular part, the cover part does not need to be provided in the edge part of the hollow tubular part. Moreover, in the said embodiment, although the cyclic | annular seal groove (groove part) was provided in the molded object, the annular protrusion was provided in the same location instead of the seal groove.

  Moreover, the specific use of the tubular resin molded body is not particularly limited. Even when a tubular resin molded body is used as the filter member, the object of filtration is not limited to fuel, and may be a liquid such as oil or water, or a gas such as air or gas. The tubular resin molded body can be used as a connector member for connecting a rubber tube or a synthetic resin tube to a tank or a container, and the tubular resin molded body can be used for mounting a sensor or wiring. .

  As described above, the present invention is not limited to the tubular resin molded body, and may be a rod-shaped molded body. Even if the rod-shaped molded body is not hollow, the same effect can be obtained if the first cavity mold and the first slide mold are configured as described above.

  In the description of the above embodiment, the tubular resin molded body is shown with a window portion, that is, a cutout portion that penetrates to the hollow portion of the resin molded body. However, the portion formed by the first slide mold is It is not limited to a window part, A notch part may be sufficient. Here, the notch portion refers to a portion that is molded into a recessed shape rather than a portion that is molded by the first cavity mold that exists around the first slide mold in the rod-shaped molded body. As a notch part, a notch, a groove | channel, a bottomed hole, etc. can be illustrated, for example. Further, the notch may be a through hole that penetrates the rod-shaped molded body in a direction orthogonal to the central axis.

  Moreover, in the description of the above embodiment, the form in which the flange portion is provided on the rod-shaped molded body is shown, but the flange portion may be a convex portion. Here, a convex part is a site | part provided by protruding from the center axis | shaft of a rod-shaped molded object to the radial direction outer side from another part. The convex portion may be a flange shape, or may be a block shape, a column shape, a plate shape, or a portion that protrudes radially outward in a predetermined circumferential range over a predetermined length in the axial direction. If the convex part is provided not only in a flange part, the said invention can be implemented so that a 1st cavity type | mold and a 2nd cavity type | mold may be divided | segmented on the boundary of the part of a convex part.

  In the description of the injection mold according to the above embodiment, the example in which the first slide mold is inserted through the through hole provided in the first cavity mold is shown. However, the first slide mold and the first cavity are illustrated. The embodiment of the mold insertion is not limited to the through hole. That is, if the first slide mold is slidably provided in a slit provided in a part of the first cavity mold, the same effect can be obtained. In addition, it is preferable that a slit is a through-hole shape like the said embodiment.

  According to the injection molding die of the tubular resin molded body and the manufacturing method of the tubular resin molded body, various tubular resin molded bodies can be efficiently manufactured by using injection molding, and the industrial utility value is high.

DESCRIPTION OF SYMBOLS 1 Tubular resin molding 11 Hollow tubular part 12 Lid part 13 Window part 14 Screw part 15 Annular seal groove 16 Nut part 17 Expansion part 18 Flange part 19 Mesh 2 Fuel tank 3 O-ring 4 Fixed side mold 40 Template (fixed side) )
41 First cavity mold 42 First slide mold 5 Moving side mold 50 Mold plate (moving side)
51 Core pin 52 Second slide mold C Cavity m Center shaft 9 Tubular resin molded body 91 Hollow tubular portion 93 Window portion 94 Screw portion 95 Annular seal groove 98 Primary molding portion 99 Secondary molding portion

Claims (7)

An injection mold for injection molding a rod-shaped molded body,
The rod-shaped molded body is
At least a part of the outer surface is provided with a screw part and a notch part,
The injection mold is
A first cavity mold that defines at least the shape of the thread portion;
A first slide mold for forming the notch,
A second cavity mold that defines at least a part of a part other than the part defined by the first cavity mold,
The first cavity mold is configured to be rotatable,
The first slide mold is provided to be slidable in a slit provided in a part of the first cavity mold,
When the mold is closed, the first slide mold passes through the slit, and rotation of the first cavity mold is prevented.
An injection mold configured such that when the mold is opened, the slide mold is extracted from the first cavity mold so that the first cavity mold can be rotated. The rod-shaped molded body further includes:
Provided with a protrusion protruding outward from the outer surface,
Between the convex portion and one end, the screw portion and the notch portion,
The injection mold according to claim 1, wherein the second cavity mold forms the convex portion. The convex portion includes a groove or a protrusion on a surface perpendicular to the longitudinal direction,
The injection mold according to claim 2, wherein the first cavity mold forms the groove portion or the protrusion. The rod-shaped molded body has a hollow tube shape,
A core pin that defines at least the inner peripheral surface shape of the rod-shaped molded body;
The injection mold according to any one of claims 1 to 3, wherein the first slide mold forms the cutout portion penetrating to the hollow portion of the rod-shaped molded body in cooperation with the core pin. A filter mesh is integrated with the notch,
5. The injection mold according to claim 4, wherein the first slide mold has a shape in which the filter mesh is formed in the notch. The rod-shaped molded body is
It has a bulging part that becomes an undercut when removing in the axial direction on the opposite side of the notch part with respect to the screw part.
The injection mold according to any one of claims 1 to 5, wherein the second cavity mold has a second slide mold that can be opened in a direction so as to eliminate an undercut of the bulging portion. A method for producing the rod-shaped molded body using the injection mold according to any one of claims 1 to 6,
Closing the mold with the first slide mold penetrating the first cavity mold;
Injecting resin into the cavity of the closed injection mold to solidify the resin, and forming a rod-shaped molded body inside the mold;
After the first slide mold is moved so as to be extracted from the first cavity mold, the first cavity mold is rotated to remove the threaded portion of the outer surface of the formed rod-shaped molded body from the first cavity mold. Molding process;
The manufacturing method of the rod-shaped molded object which has this.

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