JP2018123904A - Resin molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molding die used in a resin sealing method for easily sealing an excessive screw portion formed between a pipe portion and a pipe connection member with a resin.SOLUTION: A resin molding die for sealing an excessive screw portion formed between a pipe portion and a pipe connection member with a resin, has a cavity portion communicated from one end portion to the other end portion, a first opening portion disposed on one end portion, having the shape corresponding to the outer shape of the pipe portion, and configuring the cavity portion, a second opening portion disposed on the other end portion, having the shape corresponding to the outer shape at a pipe portion side, of the pipe connection member, and configuring the cavity portion, a cut line continued from one end portion to the other end portion, and formed to communicate the outer surface and the cavity portion, and at least one or more holes connecting the outer surface and the cavity portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mold for resin molding.

  Various media such as city gas and water are usually supplied through a pipe installed between a supply source and a consumption place.

  As the pipe, for example, a metal pipe or a pipe obtained by coating a metal pipe with a resin is used. And according to the installation place of piping, the length of the pipe used for piping, etc., piping is formed by connecting pipes using a pipe connection member.

  By the way, when connecting a pipe part to a pipe connection member, a screw is cut so that it may respectively engage with a part connected to a pipe connection member of a pipe part, and a part connected to a pipe part of a pipe connection member, and the pipe part is connected with the screw. A method of fixing to a pipe connecting member is generally used. However, when the pipe part is connected to the pipe connecting member, the threaded part cut into the pipe part is not completely covered by the pipe connecting member, and an exposed screw part, that is, an extra screw part is generated. When the extra screw portion is generated in this manner, depending on the environment such as the installation location of the pipe, corrosion tends to proceed from the extra screw portion. For this reason, the method of suppressing the corrosion of an extra thread part has been examined conventionally.

For example, in Patent Document 1, a resin-coated tube and a pipe connecting member in which an outer peripheral surface of a metal tube is coated with a resin layer are screwed, and a metal tube portion at a pipe end portion of the resin-coated tube is screwed into the pipe connecting member. It is a corrosion prevention method of the pipe connection part connected as
A self-adhesive rubber tape is wound around the outer surface of the resin layer and the outer surface of the pipe connection member so as to overlap each other while being elastically stretched. An anticorrosion method for a pipe connection part that forms a continuous anticorrosion coating layer over a surface is disclosed.

  However, according to the anticorrosion method described in Patent Document 1, it is necessary to wrap a self-adhesive rubber tape around the connection portion between the resin coating layer having a complicated shape and the pipe connection member. For this reason, a gap may be formed between the wound self-adhesive rubber tapes, and corrosion factors such as water may enter through the gap and the anticorrosion effect may not be sufficiently exhibited. Moreover, it was difficult to maintain the anticorrosion effect over a long period of time.

  Furthermore, there is a known method of applying an anti-corrosion paint to the extra screw part. However, the anti-corrosion paint is peeled off, and corrosion factors such as water intrude from the gaps generated in the anti-corrosion paint. In some cases, the effect could not be fully exhibited. Moreover, it was difficult to maintain the anticorrosion effect over a long period of time.

JP 2006-275177 A

  Therefore, in view of the above-described problems of the prior art, in one aspect of the present invention, an extra screw portion generated between the tube portion and the tube connecting member is used in a resin sealing method that can be easily resin-sealed. An object is to provide a mold for resin molding.

According to one aspect of the present invention, a mold for resin molding for resin-sealing an extra screw portion generated between a pipe part and a pipe connecting member,
A cavity that communicates from one end to the other end at a position opposite to the one end;
A first opening provided at the one end, having a shape corresponding to the outer shape of the tube, and constituting the cavity;
A second opening that is provided at the other end, has a shape corresponding to the outer shape of the tube connecting member on the tube portion side, and forms the cavity;
A cut line that is continuous from the one end to the other end, and is formed so that the outer surface communicates with the cavity,
There is provided a mold for resin molding having an outer surface and at least one or more holes connecting the cavity.

  According to one aspect of the present invention, there is provided a mold for resin molding used in a resin sealing method capable of easily resin-sealing an extra screw portion generated between a pipe portion and a pipe connecting member. be able to.

FIG. 3 is a diagram illustrating the configuration of a pipe that can be sealed with a resin molding die according to the present embodiment. Explanatory drawing of the type | mold for resin molding of this embodiment. Explanatory drawing of the other structural example of the type | mold for resin molding of this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and the following embodiments are not departed from the scope of the present invention. Various modifications and substitutions can be made.

  The mold for resin molding of the present embodiment is a mold for resin molding for resin-sealing an extra screw portion generated between the tube portion and the tube connecting member. The mold for resin molding of the present embodiment includes a cavity, a first opening that constitutes the cavity, a second opening that constitutes the cavity, a score line, and at least one or more holes. Can have.

  Here, the said cavity part can have the shape connected from the one edge part to the other edge part in the position on the opposite side to one edge part. The first opening is provided at the one end, has a shape corresponding to the outer shape of the tube, and can constitute a cavity. The second opening is provided at the other end, has a shape corresponding to the outer shape of the tube connecting member on the tube portion side, and can constitute a hollow portion.

  The score line is continuous from one end to the other end, and can be formed such that the outer surface communicates with the cavity. Moreover, the hole can connect an outer surface and a cavity part.

  Here, first, the configuration of a pipe that performs resin sealing with the resin molding die of the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, a pipe 10 having an extra screw portion that performs resin sealing with a resin molding die of the present embodiment can include a pipe portion 11 and a pipe connecting member 12. Can be connected to the pipe connecting member 12.

  In addition, although the structure of the pipe part 11 and the pipe connection member 12 is not specifically limited, Corrosion of an extra thread part etc. is prevented by resin-sealing with the type | mold for resin molding of this embodiment. Therefore, it is preferable that at least the pipe portion 11 has a portion made of a material that easily corrodes. Specifically, the tube portion 11 preferably includes a metal tube such as a metal tube or a resin-coated metal tube. Similarly, for the pipe connection member 12, for example, a metal pipe connection member, a resin-coated metal pipe connection member, and the like can be given. In addition, although the example which used the elbow was shown in FIG. 1 as a pipe connection member, it is not limited to an elbow, Various pipe joints, such as cheese and a socket, can be used besides an elbow.

  When the pipe part 11 is connected to the pipe connection member 12 and forms the pipe 10, a screw is cut on the surface of the end part on the side connected to the pipe connection member 12. Then, by screwing the threaded portion of the tube portion 11 into a female screw portion (not shown) formed in advance on the inner surface of one end portion 12A of the tube connection member 12 on the side to which the tube portion 11 is connected, The pipes 10 can be formed by connecting. And since the screw formed in the pipe part 11 is not completely screwed in in the pipe connection member 12, and a part remains, the extra screw part 111 remains and it will be in the exposed state.

  Therefore, by using the resin molding die of this embodiment, resin sealing can be performed so as to cover the region including the extra screw portion 111, for example, the region 13 indicated by the dotted line in FIG. By sealing the region including the extra screw portion 111 in this way, it is possible to reliably prevent the extra screw portion 111 from being exposed and causing corrosion or the like to proceed due to the surrounding atmosphere.

  In addition, although the example which connected the pipe part 11 only to one edge part 12A of the pipe connection member 12 is shown in FIG. 1, another pipe part can also be connected also about the other edge part 12B. In this case, the extra screw portion of the pipe portion connected to the other end portion 12B of the pipe connecting member 12 can be similarly resin-sealed with resin.

  Next, a configuration example of a resin molding die according to the present embodiment will be described with reference to FIGS. 2A, 2B, and 3. FIG. 2A and 3 schematically show perspective views of a resin molding die according to the present embodiment. In FIG. 2A and FIG. 3, it is shown with a dotted line so that the shape of the cavity inside the mold for resin molding can be understood. FIG. 2B is a cross-sectional view in a plane that is parallel to the central axis of the resin molding die of the present embodiment shown in FIG. 2A and passes through the central axis. In FIG. 2 (B), the figure of the state with which it attached to piping is shown for description, and the same number is attached | subjected to the same member as FIG. The resin molding die 20 shown in FIGS. 2A and 2B and the resin molding die 20 ′ shown in FIG. 3 have holes 24A and 24B and a hole 24A ′ described later. , 24B 'has the same configuration except that the configuration such as position is different. For this reason, the same number is attached | subjected to the same member, and a common part is demonstrated using FIG. 2 (A) and FIG. 2 (B) below.

  The resin molding die 20 of this embodiment shown in FIGS. 2A and 2B accommodates a part of the pipe portion 11 and the pipe connection member 12 of the pipe 10 described above. It can have a cavity 21 that can. The hollow portion 21 can have a shape communicating from one end 20A of the resin molding die 20 of the present embodiment to the other end 20B.

  The one end portion 20A can be provided with the first opening portion 22A, and the other end portion 20B can be provided with the second opening portion 22B. The first opening portion 22A and the second opening portion 22B can be provided. The opening 22 </ b> B can constitute the cavity 21.

The mold 20 for resin molding of this embodiment can be installed, for example so that the extra thread part 111 of the piping 10 mentioned above may be covered. For this reason, the first opening 22 </ b> A can have a shape corresponding to the outer shape of the tube portion 11. For example, the first opening 22A has a circular shape, and the diameter D _22A is preferably a size corresponding to the outer diameter D ₁₁ (see FIG. 1) of the tube portion 11. Specifically, D _22A is preferably the same size as D ₁₁ or a size having some clearance.

The second opening 22B can have a shape corresponding to the outer shape of the pipe connecting member 12. Specifically, for example, the second opening 22B has a circular shape, and its diameter D _22B is the diameter D ₁₂ of the outer shape of one end 12A of the pipe connecting member ₁₂ (see FIG. 1). It is preferable that the size corresponds to. Specifically, D _22B is preferably the same size as D ₁₂ or a size having some clearance.

As shown in FIG. 2 (B), the cavity portion 21 is used to inject resin between the outer wall of the pipe 10 when it is attached to the pipe 10 composed of the pipe portion 11 and the pipe connecting member 12. It is preferable that the space is secured. For this reason, in the portions other than the vicinity of the first opening 22A and the second opening 22B, the diameter D _{11 of} the cavity 21 is larger than the diameters D ₁₁ and D ₁₂ of the outer shapes of the tube 11 and the tube connecting member 12. ₂₁ is preferably longer.

Further, for example, the first opening 22A, and the diameter _{D 21} of the cavity 21 in the portion other than the vicinity of the second opening 22B has a diameter _{D 22A} of the first opening 22A, the second opening 22B It is preferably longer than the diameter D _22B .

  Here, the case where the hollow portion 21 has a substantially cylindrical shape has been described as an example. However, the hollow portion 21 is not limited to such a shape, and one of the pipe portion 11 and the pipe connecting member 12 including the extra screw portion 111 is not limited thereto. Any shape that can accommodate the area of the portion may be used. However, since it is easy to manufacture the mold for resin molding of the present embodiment and the resin can be formed to have a uniform thickness in the circumferential direction of the pipe, it is preferable to have the cylindrical shape as described above.

  The resin molding die 20 of this embodiment can further have a score line 23. The cut line 23 is continuous from one end 20A to the other end 20B, and can be formed so that the outer surface 201 (see FIG. 2B) and the cavity 21 communicate with each other. By providing such a cut line 23, it is possible to easily expand the mold 20 for resin molding from the cut line 23 to the left and right, and it is easy to attach to the pipe 10, which is preferable.

  The mold 20 for resin molding of this embodiment can further have at least one or more holes 24A, 24B. For example, as shown in FIG. 2B, the holes 24A and 24B can be formed so as to connect the outer surface 201 and the cavity portion 21, and the resin molding die 20 of the present embodiment is connected to the piping. 10, the region including the remaining screw portion of the pipe 10 can be resin-sealed by injecting a sealing resin from the hole 24 </ b> A and / or the hole 24 </ b> B.

  In addition, although the example which provided the two holes of 24A and 24B is shown, it is not limited to the form which concerns. It is only necessary that the resin can be injected into the cavity 21, and only one of the holes may be provided, or three or more holes may be provided. However, when injecting the resin, it is preferable to provide two holes, a hole for extracting the air in the cavity 21 and a hole for resin injection.

  The place where the holes 24A and 24B are provided is not particularly limited, but it is preferable that the holes 24A and 24B are provided on the upper surface or the side surface when the resin is injected into the pipe 10 so as not to flow out of the cavity 21. For this reason, it is preferable to provide in one or more places selected from one end part 20A, the other end part 20B, and the side surface, for example.

  For example, the mold for resin molding used when resin-sealing an extra screw portion generated between a vertical pipe, that is, a pipe part 11 extending in the vertical direction with respect to the ground, and a pipe connecting member 12 connected to the pipe part 11 is Like the resin molding die 20 shown in FIGS. 2A and 2B, holes 24A and 24B are preferably provided on the upper surface. By providing the holes 24A and 24B on the upper surface in this way, when the resin molding die 20 is mounted on the pipe 10, the holes 24A and 24B are located above, so that the resin can be easily injected. This is preferable because it can prevent outflow of the injected resin.

  Further, FIG. 3 shows a mold for resin molding used when resin-sealing an extra screw portion formed between a horizontal pipe, that is, a pipe part extending in the horizontal direction and a pipe connecting member connected to the pipe part. It is preferable to provide the holes 24A ′ and 24B ′ on the side surface like the mold 20 ′ for resin molding. By providing the holes 24A ′ and 24B ′ on the side surfaces in this way, the holes 24A ′ and 24B ′ can be easily arranged upward when the resin molding die 20 ′ is mounted on the pipe. For this reason, the resin can be easily injected, and the injected resin can be prevented from flowing out, which is preferable.

The wall thickness t (see FIG. 2B) defining the cavity 21 of the resin molding die 20 of the present embodiment is not particularly limited, and the thickness of the material used for the resin molding die is not limited. It can be selected according to hardness or the like. For example, when the resin is filled in the cavity 21 of the mold for resin molding, it is preferable to select the wall thickness t so that the filled resin can be supported. Further, the wall thickness t of the wall portion of the resin molding die 20 does not need to be uniform. For example, the wall thickness t _A , t _B of the wall portion of one end 20A and the other end 20B (FIG. 2 ( (See B)), it may be configured to be different from the thickness t of other portions.

  The material of the mold for resin molding of this embodiment is not particularly limited. However, a material that does not react with the injected resin is preferable. Moreover, in order to expand and attach to the piping 10 from the cut line 23, it is preferable that it is a material which has a certain amount of flexibility.

  Next, a resin sealing method (resin sealing method) using the resin molding die of this embodiment will be described.

  A resin sealing method using a resin molding die of the present embodiment for resin sealing an extra screw portion generated between a tube portion and a tube connecting member can include, for example, the following steps.

A mold mounting process for mounting the above-described mold for resin molding so that the extra screw portion is positioned in the cavity.
A resin injection process in which a resin is injected from a hole in a mold for resin molding.

  This will be described with reference to FIG.

  In the mold mounting step, the above-described resin molding mold 20 can be mounted on the pipe 10 as shown in FIG. Although the specific method of mounting is not particularly limited, as described above, for example, the mounting is performed on the pipe 10 while expanding the resin molding die 20 in the left and right directions in FIG. Can do.

  At this time, the extra screw portion 111 is positioned in the cavity portion 21 of the resin molding die 20 so that the extra screw portion 111 can be resin-sealed, that is, the extra screw portion of the mold 20 for resin molding. It is preferable to attach a mold 20 for resin molding so as to cover 111. In particular, as shown in FIG. 2 (B), an extra screw portion 111, a partial region on the extra screw portion 111 side of the tube portion 11, and a partial region on the extra screw portion 111 side of the tube connecting member 12 It is preferable to mount the mold 20 for resin molding so that is located in the cavity 21.

  In addition, when performing the mold release process mentioned later, a mold release agent etc. are apply | coated to the surface of the cavity part 21 of the mold 20 for resin molding so that the mold 20 for resin molding can be released easily. You can also.

  After the mounting, the resin molding die 20 can be fixed by attaching a tape or the like so as to straddle the cut line 23 so that the resin molding die 20 does not come off. At this time, it is preferable to apply a tape or the like so that the holes 24A and 24B provided in the resin molding die 20 are not blocked.

  In the resin injection step of injecting resin, the resin can be injected into the cavity 21 of the resin molding die 20 from the holes 24A and / or the holes 24B provided in the resin molding die 20.

  The type of resin used in the resin injection step is not particularly limited, and can be arbitrarily selected according to, for example, the material of the pipe portion. For example, a two-component mixed resin can be preferably used. This is because, in the case of a two-component mixed type resin, for example, when the resin is injected with a dedicated jig, the two components can be mixed and the curing reaction can be started, so that the storage stability and handleability are excellent. As the two-component mixed resin, a two-component mixed epoxy resin or the like can be preferably used.

  In addition, a resin that initiates a curing reaction by a simple operation such as an ultraviolet curable resin can be preferably used.

  After the resin is injected, for example, the holes 24A and 24B can be closed with a tape or the like so that the resin injected from the holes 24A and 24B does not flow out.

  And after resin superposes | polymerizes, ie, after resin hardens | cures sufficiently, the mold release process of releasing the type | mold 20 for resin molding can also be implemented. Although the specific operation at the time of mold release is not particularly limited, the resin molding die 20 is expanded from the cut line 23 in the left and right directions in FIG. Mold release can be performed.

  It is not necessary to release the mold for resin molding after the resin injected into the mold for resin molding is cured. For this reason, in the resin sealing method of the present embodiment, for example, the operation can be completed up to the resin injection step without performing the above-described release step.

  In this way, the cured resin can be protected by the mold for resin molding by leaving the mold for resin molding without performing the mold release step.

  As described above, the configuration example of the resin molding die according to the present embodiment has been described. By using the resin molding die according to the present embodiment, an extra screw portion generated between the tube portion and the tube connecting member is obtained. Resin sealing can be easily performed. For this reason, for example, compared to the conventional method using a self-adhesive rubber tape or the method of applying a resin or a rust preventive paint, it is possible to seal the extra screw portion more reliably and for a longer period of time. The anticorrosion effect can be exhibited over the whole.

DESCRIPTION OF SYMBOLS 10 Pipe 11 Pipe part 111 Extra screw part 12 Pipe connection member 20, 20 'Resin molding type | mold 20A One end part 20B The other end part 21 Cavity part 22A 1st opening part 22B 2nd opening part 23 Cut line 24A, 24B, 24A ', 24B' hole

Claims (1)

A mold for resin molding for resin-sealing an extra screw portion generated between a pipe part and a pipe connecting member,
A cavity that communicates from one end to the other end at a position opposite to the one end;
A first opening provided at the one end, having a shape corresponding to the outer shape of the tube, and constituting the cavity;
A second opening that is provided at the other end, has a shape corresponding to the outer shape of the tube connecting member on the tube portion side, and forms the cavity;
A cut line that is continuous from the one end to the other end, and is formed so that the outer surface communicates with the cavity,
A mold for resin molding having an outer surface and at least one or more holes connecting the cavity.

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