JP2013099962A - Method of manufacturing resin pipe with nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a resin pipe with a nozzle with high gastightness at a joint of the nozzle and the resin pipe.SOLUTION: This method for manufacturing includes a heating process in which, a rod whose thermal expansion coefficient is larger than that of the nozzle is used, a resin pipe constituent that composes the resin pipe is wrapped around the rod and made cylindrical, the one end part of the resin pipe constituent made into cylindrical is disposed in the nozzle, the rod is disposed in the one end part, and these three are disposed nearly co-axial and heated. The resin pipe is formed by generating an external pressure from the nozzle, and an internal pressure from the rod at the one end part by the thermal expansion coefficient difference between the nozzle and the rod, while melting the resin pipe constituent by this heating process, and fusion welding of the outer peripheral surface of the one end part to the inner circumferential surface of the nozzle by pressure bonding of the outer circumferential surface of the one end part to the inner circumferential surface of the nozzle.

Description

  The present invention relates to a method for manufacturing a resin pipe with a cap.

Currently, aircraft and spacecraft are required to reduce the weight of aircraft, and in aircraft, fiber reinforced resin composite materials with high specific strength are beginning to be widely used in various parts such as wings and fuselage.
Pipes used in aircraft and spacecraft are mainly metal pipes such as aluminum and titanium. However, the pipes can also be reduced in weight by using fiber reinforced resin composites.
Currently, pipes using fiber reinforced resin composite materials such as sewage pipes (maximum internal pressure of 1.0 MPa or less) using the corrosion resistance of fiber reinforced resins have been put into practical use for general industries other than the aerospace field.
However, for aerospace applications, pressure resistance and airtightness (gas barrier properties) as well as light weight are required. With only the fiber reinforced resin composite material, it is difficult to ensure airtightness, and the medium passing through the inside of the pipe may be leaked.

  Patent Documents 1 and 2 describe a method for manufacturing a fiber-reinforced resin composite tube. Patent Document 2 describes that an inner surface protective layer (7) made of only a resin is formed on the innermost layer of the fiber-reinforced resin composite tube.

JP-A-9-277391 JP 2001-270005 A

  However, Patent Documents 1 and 2 do not describe a resin tube with a cap, that is, a resin tube to which a cap used for connecting pipes is bonded, or a manufacturing method thereof.

  This invention is made | formed in view of the problem in the above prior art, Comprising: It makes it a subject to maintain airtightness in the junction part of the nozzle | cap | die of a resin tube with a nozzle | cap | die, and a resin tube.

The invention according to claim 1 for solving the above-described problem has a base and a resin tube having one end joined to the base, the one end being disposed in the base, and an outer periphery of the one end A method of manufacturing a resin tube with a cap whose surface is bonded to the inner peripheral surface of the cap,
Using a bar with a larger coefficient of thermal expansion than the base,
The resin tube constituting material constituting the resin tube is formed into a cylindrical shape, and one end portion of the resin tube constituting material is made into the base, the rod material is put into the one end portion, and the three members are substantially coaxial. It is equipped with a heating process that heats after arranging
While the resin tube constituent material is melted by the heating step, an external pressure from the base and an internal pressure from the bar are generated at the one end due to a difference in thermal expansion coefficient between the base and the bar, and the one end The outer peripheral surface of the base is crimped and held on the inner peripheral surface of the base, and the outer peripheral surface of the one end is fused to the inner peripheral surface of the base to mold the resin tube.

  According to a second aspect of the present invention, a sheet material made of a resin material constituting the resin tube is wound around the rod material a desired number of times, the resin tube component material is held in a cylindrical shape, and the heating step is executed. It is a manufacturing method of the resin pipe with a cap of Claim 1.

  A third aspect of the present invention is the method of manufacturing a resin tube with a cap according to the second aspect, wherein the sheet material is a liquid crystal polymer sheet material.

  Invention of Claim 4 is a manufacturing method of the resin pipe with a nozzle | cap | die of Claim 1 which the outer peripheral part of the said bar consists of the rubber material which has the heat resistance which can endure the said heating process.

  The invention according to claim 5 is the method for producing a resin tube with a cap according to claim 4, wherein the resin tube is made of a liquid crystal polymer, and the rubber material is silicon rubber.

The invention according to claim 6 is that the bar comprises an inner bar and an outer peripheral member formed on the outer peripheral surface of the inner bar,
The said outer peripheral member is a manufacturing method of the resin pipe with a nozzle | cap | die of Claim 1 which consists of a material with a larger thermal expansion coefficient than the said inner rod material.

  The invention according to claim 7 is the method of manufacturing a resin tube with a cap according to claim 6, wherein the outer peripheral member is made of a heat-resistant rubber material that can withstand the heating step, and the inner rod material is made of metal. .

  The invention according to claim 8 is the method of manufacturing a resin tube with a cap according to claim 7, wherein the resin tube is made of a liquid crystal polymer and the rubber material is made of silicon rubber.

  The invention according to claim 9 is characterized in that the outer peripheral surface of the resin tube constituent material of the portion extending from the base is formed by a female jig having an inner peripheral surface corresponding to the outer peripheral surface of the resin tube. It is a manufacturing method of the resin pipe with a nozzle | cap | die of Claim 1 which performs the said heating process, after covering from the time of an end surface.

  A tenth aspect of the present invention is the method for manufacturing a resin tube with a cap according to the ninth aspect, wherein the heating step is performed by fixing and holding the cap on the female jig.

  The invention according to claim 11 is the resin with cap according to claim 10, wherein after the heating step, the bar is removed from the resin tube while maintaining the state in which the cap is fixed and held by the female jig. It is a manufacturing method of a pipe.

  According to a twelfth aspect of the present invention, a heat-resistant tape that can withstand the heating process is wound around an end of the base on the side where the resin tube extends, and an inner peripheral surface of the female jig is bonded to the heat-resistant tape. In the state where the gap between the base and the female jig is filled, the base is fixedly held on the female jig and the heating step is executed. In the heating step, the resin tube configuration is formed with the heat-resistant tape. The method of manufacturing a resin pipe with a cap according to claim 9, wherein the flow of the resin from which the material has melted is stopped.

The invention according to claim 13 includes a base and a resin tube having one end joined to the base, the one end being disposed in the base, and an outer peripheral surface of the one end being an inner peripheral surface of the base. Insert a rod-shaped core extending portion extending from another resin tube into the resin tube at the portion extending from the base of the resin tube with cap attached to the base, The end surface of the end portion is extended to the inside of the base, the end surface of the resin tube is aligned with the end surface of the other resin tube, the joint is covered with a resin material, and heat is applied from the base and the core. A heating step is performed in which a bar having a large expansion coefficient is placed in the resin pipe in the base and then heated.
In the heating step, both the resin pipe and the resin material are melted, and an external pressure from the base and an internal pressure from the bar are generated at the one end due to a difference in thermal expansion coefficient between the base and the bar. It is a method for manufacturing a resin tube with a cap, in which the outer peripheral surface of the one end is pressed and held on the inner peripheral surface of the cap, and the resin tube and the other resin tube are melt-bonded to be unified.

  The invention according to claim 14 is the method of manufacturing a resin pipe with a cap according to claim 13, wherein the core is made of a water-soluble material, and the core is dissolved and removed after the heating step.

  According to a fifteenth aspect of the present invention, the heating step is performed by bagging the resin tube or the resin tube component and the base and the bar or other attached jig, and heating and pressurizing with an autoclave. It is a manufacturing method of the resin pipe with a cap as described in any one of Claims 1-14.

  According to the method for producing a resin tube with a cap of the present invention, when the resin tube component is heated and melted, the outer peripheral surface of one end of the resin tube component is made to be the inner peripheral surface of the cap by a rod having a larger coefficient of thermal expansion than the die. Since the outer peripheral surface of one end of the resin tube is adhered and bonded to the inner peripheral surface of the base, the base-attached resin tube of the present invention can be easily manufactured.

  According to the resin tube with a cap manufactured by the method for manufacturing a resin tube with a cap according to the present invention, one end portion of the resin tube is disposed in the cap, and the outer peripheral surface of the one end portion is attached to the inner peripheral surface of the cap. Because it is bonded, even if the pressure in the pipe increases, the resin tube is pressed against the inner peripheral surface of the base to increase the adhesion with the base, and the air tightness at the base joint can be maintained higher as the internal pressure increases, There is an effect that the medium in the tube is difficult to leak.

It is the lower body side view and upper body sectional drawing of a resin pipe with a nozzle concerning one embodiment of the present invention. It is sectional drawing of the composite bar material which concerns on one Embodiment of this invention. It is the upper side figure (a) and AA sectional view (b) of a metallic mold in order to shape a compound bar concerning one embodiment of the present invention. It is the perspective view which showed a mode that a sheet | seat material was wound around the composite bar concerning one Embodiment of this invention. It is sectional drawing (however, the lower half body of a nozzle | cap | die is a side view) which shows the state which attached the composite bar to the resin pipe structure with a nozzle | cap | die which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which attached the jig | tool containing a female jig | tool to the resin pipe structure with a nozzle | cap | die which concerns on one Embodiment of this invention (however, the lower half body of a nozzle | cap | die and a female jig | tool is a side view). It is process drawing including the addition process of the resin pipe with a nozzle | cap | die which concerns on one Embodiment of this invention. It is sectional drawing (however, the lower body of a nozzle | cap | die is a side view) which shows the state after execution of a heating process at the time of using the bar which consists only of silicon rubber which concerns on other one Embodiment of this invention. It is sectional drawing (however, the lower body of a nozzle | cap | die is a side view) which shows the state which added the resin pipe | tube to the resin tube with a nozzle | cap | die concerning other one Embodiment of this invention.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

[Composition of resin pipe with cap]
First, the cap-attached resin tube of this embodiment will be described. As shown in FIG. 1, the resin tube with a cap is composed of a cap 1, a resin tube 2, and an outer tube 3. The resin tube 2 is made of a liquid crystal polymer that is a thermoplastic resin having a high gas barrier property, and the outer tube 3 is made of a carbon fiber reinforced resin composite material that can exhibit high strength and high pressure resistance. Therefore, the cap-attached resin tube has pressure resistance and high airtightness (gas barrier property) due to the two-layer structure including the airtight layer of the resin tube 2 and the pressure resistant layer of the outer tube 3.

  The base 1 is made of metal such as titanium. The base 1 includes a mouth part 1a and a neck part 1b. The mouth part 1a is a part connected to another pipe. The neck portion 1b is a portion where the outer tube 3 is joined. The inner peripheral surface of the mouth portion 1a and the inner peripheral surface of the neck portion 1b are constituted by one continuous cylindrical surface. The outer peripheral surface of the neck 1b is formed in a tapered shape. The outer peripheral surface of the one end portion 2a of the resin tube 2 is disposed in the base 1 and is adhered and joined to the inner peripheral surface of the base 1 by fusion. An extending portion 2 b of the resin tube 2 extends from the inside of the base 1. One end 3a of the outer tube 3 is joined to the outer peripheral surface of the neck 1b. The extension part 3b of the outer tube 3 extends from the neck part 1b. The inner peripheral surface of the extending portion 3 b of the outer tube 3 is joined to the outer peripheral surface of the extending portion 2 b of the resin tube 2.

If the resin tube 2 is disposed outside the base 1, a force acts in a direction in which the resin tube 2 is peeled off from the base 1 due to internal pressure, and a structure in which leakage is likely to occur is obtained.
However, according to the cap-attached resin tube, the one end 2a of the resin tube 2 is disposed in the cap 1, and the outer peripheral surface of the one end 2a is adhered to the inner peripheral surface of the cap 1, Even if the pressure increases, the resin tube 2 is pressed against the inner peripheral surface of the base 1 to improve the adhesion with the base 1, maintain high airtightness at the base joint portion, and has a structure that is difficult to leak.
Further, according to the resin pipe with a cap, the cap 1 can be connected not only to the pipe of the present invention but also to an existing pipe made of metal, and can be applied to a piping facility entirely and partially. is there.

[Manufacturing method 1 of resin pipe with cap]
Next, manufacturing method 1 of the resin pipe with a cap is described.
While the base 1 is manufactured or obtained, a composite bar 4 as shown in FIG. 2 is manufactured.
The composite bar 4 includes an aluminum inner bar 4a and a silicon rubber outer member 4b formed on the outer peripheral surface of the inner bar 4a. The outer peripheral member 4b can be formed by molding using a mold as follows. A bottom mold 5b in which a hole 5b-1 is formed is connected to a lower end of a main mold 5a in which a cylindrical space 5a-1 having openings at both ends as shown in FIG. Next, after pouring silicon material from the upper end opening of the main mold 5a, the inner bar 4a is inserted, and the lower end of the inner bar 4a is inserted into the hole 5b-1. Next, the upper die 5c in which the hole 5c-1 is formed is connected to the upper end of the main die 5a and the upper end portion of the inner rod member 4a is inserted into the hole 5c-1, so that the inner rod member 4a is inserted into the cylindrical space 5a-. 1 is fixed at the center position. Thereafter, after the silicon material is cured, the mold is opened and the completed composite bar 4 is taken out.

  The composite bar 4 has a larger thermal expansion coefficient than the base 1 as a whole. Although the composite bar 4 is preferably used, a bar made of only silicon rubber may be used instead of the composite bar 4.

  When the composite bar 4 is obtained, as shown in FIG. 4, the sheet material 6 is wound around the outer periphery of the outer peripheral member 4b a plurality of times along the circumferential direction to hold the sheet material 6 in a cylindrical shape. In this case, the sheet material 6 is a resin tube constituent material. Commercially available liquid crystal polymer sheet materials can be used. When the sheet material 6 does not have tackiness, fixing means such as an adhesive tape or an adhesive paste is used to hold the sheet material 6 in a cylindrical shape. According to this method of winding the sheet material 6, it is easy to obtain the desired thickness of the resin tube 2 accurately and uniformly by selecting the thickness of the sheet material 6 and selecting the number of windings.

  Next, as shown in FIG. 5, by inserting the composite bar 4 in which the sheet material 6 is wound around the base 1, one end of the sheet material 6 that is formed into a cylindrical shape is inserted into the base 1 and into the one end. The bar is in a state where these three members are arranged substantially coaxially. Moreover, as shown in FIG. 5, the heat-resistant tape 7 is wound around the neck 1b of the base 1.

Next, as shown in FIG. The female jig 8 is a mold composed of an upper mold 8a and a lower mold 8b. An inner peripheral surface corresponding to the outer peripheral surface of the resin tube 2 is formed, and the upper mold 8a and the lower mold are formed on a plane passing through the central axis. The structure is divided into 8b.
The base 1, the sheet material 6, the composite bar 4 and the heat-resistant tape 7 (not shown in FIG. 6) in the state shown in FIG. 5 are placed as shown in FIG. 6, that is, the neck 1 b and the extension 6 b are The upper mold 8a and the lower mold 8b are fastened with bolts or the like sandwiched between the mold 8a and the lower mold 8b. As a result, the base 1 is fixedly held on the female jig 8 and the inner peripheral surface of the female jig 8 is crimped to the heat-resistant tape 7 to fill the gap between the base 1 and the female jig 8. To do. At the same time, the extending portion 6b of the sheet material 6 is covered with the female jig 8 from the end surface 1c of the base 1 to restrain the whole. This is because a shear force is generated in the sheet material 6 at the position of the end surface 1c of the base 1 due to the expansion of the composite bar 4 during the heating process, and the resulting resin tube 2 is not cracked or locally deformed. Therefore, a portion corresponding to the neck portion 1b of the female jig 8 is formed in a tapered shape along the neck portion 1b and is formed to have a larger diameter than the extending portion 6b. Moreover, it is good to cover the whole extension part 6b with a heat resistant film for the purpose of easy mold release and adjustment of a molding condition.
The reason why the base 1 is fixedly held on the female jig 8 is to fix the positional relationship between the extending portion 2 of the resin tube and the base 1.

Bag base 1, sheet material 6, composite bar 4, heat-resistant tape 7 (not shown in FIG. 6) and female jig 8 set as shown in FIG. 6, that is, put them in a heat-resistant bag. The inside of the bag is evacuated and tightened and secured. This is heated and pressurized in an autoclave to perform a heating step.
In this heating process, while the sheet material 6 is melted, the one end 6a is caused to generate an external pressure from the base 1 and an internal pressure from the composite bar 4 at the one end 6a due to a difference in thermal expansion coefficient between the base 1 and the composite bar 4. The outer peripheral surface of the first end 6 a is pressed and held on the inner peripheral surface of the base 1, and the outer peripheral surface of the one end 6 a is fused to the inner peripheral surface of the base 1. Further, the sheet material 6 is formed by the composite bar 4 and the female jig 8 by the main heating process, and becomes the resin tube 2.
Further, the flow-out of the resin from which the sheet material 6 has melted during the main heating process is blocked by the heat-resistant tape 7.

When the main heating step is completed, the heat-resistant bag is opened, and the composite bar 4 is pulled out from the resin tube 2 while maintaining the state in which the base 1 is fixedly held by the female jig 8. At this time, since the adhesiveness between the resin and silicon is high, it may be difficult to peel the silicon outer peripheral member 4b from the resin tube 2. In this case, the inner rod member 4a made of aluminum is preferably extracted first from the outer peripheral member 4b, and then the outer peripheral member 4b is peeled off from the resin tube 2. The outer peripheral member 4b made of silicon may be broken and peeled off and sent for recycling.
Thereafter, the female jig 8 is removed, and the attached heat-resistant tape or heat-resistant film is peeled off. Thereby, the resin tube 10 with a cap (shown in FIG. 7A) is obtained.
Contrary to the above procedure, when the composite bar 4 is removed from the resin tube 2 after removing the female jig 8, the direction of the force applied to the shaft of the base 1 and the composite bar 4 or the inner bar 4a is increased. There is a risk that the resin tube 2 may be damaged at the end face 1c due to the shake. Therefore, an appropriate fixing jig is required. However, according to the above procedure, the female jig 8 can be used as it is as the fixing jig for the base 1 and the extending portion 2b, and damage to the resin tube 2 is caused. Easy to avoid.

Next, the outer tube 3 made of a carbon fiber reinforced resin composite material is formed around the neck portion 1b and the extending portion 2b by an existing method, and the base-equipped resin tube shown in FIG. 1 is obtained.
Even if the length of the resin pipe with cap 10 is single, a resin tube 11 having a desired type or various lengths shown in FIG. As shown in FIG. 7 (c), a pipe having a desired length can be obtained by splicing to the resin pipe 10 with a cap. In this case, the resin tube 11 is manufactured by winding a sheet material of a liquid crystal polymer around a bar 12 such as an aluminum bar, bagging, and molding with an autoclave.
Next, as shown in FIG. 7 (c), the resin tube 10 with the cap and the resin tube 11 are joined together through the bar 13, and the seam is covered with a liquid crystal polymer sheet material 14, and then bagged and molded by an autoclave. To do. Thereafter, as shown in FIG. 7D, an outer tube 15 made of a carbon fiber reinforced resin composite material is formed around the base of the base and the exposed resin tube.

  Since it is based on the manufacturing method as described above, the outer peripheral member 4b selects a material having a larger coefficient of thermal expansion than the inner rod member 4a. This is because the outer peripheral surface of the composite bar 4 is effectively expanded. Whether the composite bar 4 is used or a bar made of only silicon rubber is used, the outer periphery of the bar is preferably a rubber material having heat resistance that can withstand the heating step. This is for pressing the sheet material 6 uniformly. The rubber material may have a composition other than silicon. In any case, the material of the bar is not limited. Any material may be used as long as it has an appropriate coefficient of thermal expansion and uniformly presses the sheet material 6 without causing an unfavorable change such as melting during the heating process, and a good result is obtained.

However, according to the present inventors' trial, the following is known.
FIG. 8 shows a state after execution of the heating process in the case where the bar 9 made of only silicon rubber is used. As a result of the silicon constituting the bar 9 being constrained in the radial direction during the heating process, the silicon 9 expands greatly in the axial direction and bulges from the open end of the resin tube 2. In this case, it is difficult to remove the bar 9 from the resin tube 2. In anticipation of such a result, when the outer diameter of the bar 9 is reduced, play increases between the sheet 6 wound around the bar 9 and the base 1, and the sheet 6 and the base 1 are increased. It is difficult to obtain an appropriate molding result while maintaining an appropriate positional relationship with Moreover, since the said method of extracting the inner bar 4a first after a heating process cannot be taken, difficulty in taking out remains.
Based on the trial results as described above, a method using the composite bar 4 is proposed. According to the composite bar 4, a bar having an appropriate outer diameter and an appropriate coefficient of thermal expansion can be obtained by selecting the materials and diameters of the inner bar 4a and the outer member 4b.

[Manufacturing method 2 of resin pipe with cap]
Next, the manufacturing method 2 of the resin pipe with a cap is described.
As shown in FIG. 9, this manufacturing method is a method of adding a resin tube 16 to the resin tube with cap 10.
The base-equipped resin tube 10 is manufactured according to the manufacturing method 1 described above.
Separately, the resin tube 16 is manufactured as follows.
A water-soluble material such as salt is solidified in a round bar shape with a mold to form a water-soluble core 17. The water-soluble core 17 is formed into an arbitrary shape in which a curved portion (not shown) is included in the axis, or a linear shape in which the curved portion is not included in the axis.

  A sheet material of a liquid crystal polymer is wound around the water-soluble core 17, bagged, and the resin tube 16 is formed to have the same diameter as the resin tube 2 by an autoclave.

Next, as shown in FIG. 9, the end portion of the water-soluble core 17 extending from the resin tube 16 through the opening of the resin tube 2 on the side opposite to the die 1 is inserted into the resin tube with cap 10. At this time, the end surface of the end portion into which the water-soluble core 17 is inserted can reach the position B in the base 1, and the end surface of the resin tube 2 and the end surface of the resin tube 16 are matched. On the other hand, the composite bar 18 is disposed in the resin tube 2 in the base 1. Similar to the composite bar 4, the composite bar 18 is composed of an inner bar 18a made of aluminum and an outer peripheral member 18b made of silicon rubber. However, it is assumed that the end surfaces of the inner rod member 18a and the outer peripheral member 18b are aligned at the end portion inserted into the base of the composite rod member 18. In the heating step, the extending portion 2b of the resin tube 2 is not pressed against the end surface 1c by the expanding outer peripheral member 18b of silicon. For this purpose, the position B of the tip surface of the water-soluble core 17 is arranged in the base 1. Thereby, damage of the resin pipe 2 in the end surface 1c is prevented.
A joint between the resin tube 2 and the resin tube 16 is covered with a liquid crystal polymer sheet material 19. Further, in order to strengthen protection around the end surface 1c, a portion centered on the end surface 1c is covered with a sheet material 20 of a liquid crystal polymer.

  The product set as described above is bagged and molded with an autoclave. That is, in this heating process, the resin tubes 2 and 16 and the sheet materials 19 and 20 are melted, and the external pressure from the base 1 and the composite bar 18 are applied to the one end portion 2 a due to the difference in thermal expansion coefficient between the base 1 and the composite bar 18. The inner pressure of the one end portion 2a is pressure-bonded and held on the inner peripheral surface of the base 1 so that the resin tube 2 and the resin tube 16 are fused and unified. When the resin tube 2 is melted, the outer peripheral surface of the one end portion 2a is pressure-bonded and held on the inner peripheral surface of the base 1, so that the end portion 2a and the base 1 are not peeled off, and the fusion between them is maintained. The

  After the heating step, the water-soluble core 17 is dissolved in water and removed. Since it melts and removes, this manufacturing method is especially effective when forming the resin pipe | tube 16 in the arbitrary shapes containing the curve part mentioned above. Even when the resin tube 16 has a straight shape, there is an advantage because the core can be easily removed.

  Here, for reference of the implementation of the present invention, information of an example of the embodiment that has been obtained by the present inventors and obtained favorable results is disclosed.

The inner diameter of the base 1 used in this example is 22.04 (mm), the thickness of the liquid crystal polymer sheet material is 0.1 (mm), the outer diameter of the inner bar 4a is 16 (mm), and the outer member 4b The outer diameter is 20.64 (mm).
The base 1 used in this example is made of titanium (Ti), the inner bar 4a is made of aluminum, the outer peripheral member 4b is made of silicon, and the water-soluble core 17 is made of sodium chloride. The thermal expansion coefficient of titanium (Ti) is 8.8 × 10 −6 (/ ° C.). According to the measurement by the present inventors, the thermal expansion coefficient of sodium chloride used for the water-soluble core 17 is 41.9 × 10 −6 (/ ° C.), and the thermal expansion coefficient of silicon used for the outer peripheral member 4b is 241.8 × 10 6. It was −6 (/ ° C.). The sheet material of the liquid crystal polymer used by the present inventors was supplied from a manufacturer in a state of being wound on a roll. The melting point was 280 (° C.) and the thermal expansion coefficient was −8.3 to −12.8 × 10. -6 (/ ° C).
A commercially available polyimide film was used as the cloth for the heat-resistant tape, heat-resistant film, and heat-resistant bag.

  Using the above-mentioned specification, a sheet material of liquid crystal polymer was wound 6 times around the outer peripheral member 4b, bagged, and the heating process was executed by an autoclave.

Regardless of the embodiments and examples described above, the method of manufacturing the resin tube does not have to depend on the method of winding the rod. You may implement a joining process with a nozzle | cap | die as the state which has arrange | positioned the rod in the resin pipe manufactured by the other manufacturing method.
Further, instead of the liquid crystal polymer, other resin materials may be used. However, care must be taken to ensure the necessary confidentiality and other characteristics.
Further, instead of silicon rubber, other rubber materials or other materials may be used, and any material can be used as long as a coefficient of thermal expansion that sufficiently presses the resin tube against the inner peripheral surface of the die is obtained in the heating process. Absent.
Further, the material of the base and the material of the inner rod may be appropriately selected as long as they meet the object of the present invention.
Moreover, in the said embodiment, the outer tube | pipe made from a fiber reinforced resin composite material was applied in order to ensure a required pressure | voltage resistant. Depending on the application, it can be used as a pipe without the outer pipe.

1 Base 2 Resin Tube 3 Outer Tube 4 Composite Bar 4a Inner Bar 4b Outer Member 6 Sheet Material 7 Heat Resistant Tape 8 Female Jig 9 Bar Material 10 Resin Tube with Cap 11 Resin Tube 12 Bar Material 13 Bar Material 14 Sheet Material 15 outer pipe 16 resin pipe 17 water-soluble core 18 composite bar 18a inner bar 18b outer peripheral member 19 sheet material 20 sheet material

Claims (15)

A base having a base and a resin tube having one end joined to the base, the one end being disposed in the base, and an outer peripheral surface of the one end being adhered and joined to an inner peripheral surface of the base A method for producing a resin tube with a pipe,
Using a bar with a larger coefficient of thermal expansion than the base,
The resin tube constituting material constituting the resin tube is formed into a cylindrical shape, and one end portion of the resin tube constituting material is made into the base, the rod material is put into the one end portion, and the three members are substantially coaxial. It is equipped with a heating process that heats after arranging
While the resin tube constituent material is melted by the heating step, an external pressure from the base and an internal pressure from the bar are generated at the one end due to a difference in thermal expansion coefficient between the base and the bar, and the one end A method of manufacturing a resin tube with a die, wherein the outer peripheral surface of the base is pressure-bonded and held on the inner peripheral surface of the base, the outer peripheral surface of the one end is fused to the inner peripheral surface of the base, and the resin tube is molded.   The base material according to claim 1, wherein a sheet material made of a resin material constituting the resin tube is wound around the rod material a desired number of times to hold the resin tube component material in a cylindrical shape, and the heating step is executed. Manufacturing method of resin pipe.   The method for producing a resin tube with a cap according to claim 2, wherein the sheet material is a liquid crystal polymer sheet material.   The method for manufacturing a resin tube with a cap according to claim 1, wherein an outer peripheral portion of the bar is made of a heat-resistant rubber material that can withstand the heating step.   The method of manufacturing a resin tube with a cap according to claim 4, wherein the resin tube is made of a liquid crystal polymer, and the rubber material is silicon rubber. The bar comprises an inner bar and an outer peripheral member formed on the outer peripheral surface of the inner bar,
The method of manufacturing a resin tube with a cap according to claim 1, wherein the outer peripheral member is made of a material having a larger coefficient of thermal expansion than the inner rod member.   The method of manufacturing a resin tube with a cap according to claim 6, wherein the outer peripheral member is made of a heat-resistant rubber material that can withstand the heating step, and the inner rod member is made of metal.   The method for producing a resin tube with a cap according to claim 7, wherein the resin tube is made of a liquid crystal polymer, and the rubber material is made of silicon rubber.   A portion of the outer peripheral surface of the resin pipe constituent material extending from the base is covered with a female jig having an inner peripheral surface corresponding to the outer peripheral surface of the resin pipe from the end surface of the base. And the manufacturing method of the resin pipe with a cap of Claim 1 which performs the said heating process.   The method for manufacturing a resin tube with a cap according to claim 9, wherein the heating step is performed by fixing and holding the cap on the female jig.   The method for manufacturing a resin tube with a cap according to claim 10, wherein after the heating step, the bar is withdrawn from the resin tube while maintaining the state in which the cap is fixedly held by the female jig.   A heat-resistant tape that can withstand the heating process is wound around the end of the base on the side where the resin pipe extends, and the inner peripheral surface of the female jig is crimped to the heat-resistant tape so that the base and the female mold are cured. In the state where the gap with the tool is filled, the base is fixed and held on the female jig and the heating step is executed. In the heating step, the resin flow of the resin tube component melted with the heat-resistant tape The method for producing a resin pipe with a cap according to claim 9. A base having a base and a resin tube having one end joined to the base, the one end being disposed in the base, and an outer peripheral surface of the one end being adhered and joined to an inner peripheral surface of the base Insert a rod-shaped core extension extending from another resin tube into the resin tube at the portion of the attached resin tube that extends from the base, and insert the tip end surface of the inserted end. Extend to the base, match the end face of the resin pipe and the end face of the other resin pipe, cover the seam with a resin material, and make the bar having a larger coefficient of thermal expansion than the base and the core A heating process is performed in which heating is performed after the resin pipe is placed in the base,
In the heating step, both the resin pipe and the resin material are melted, and an external pressure from the base and an internal pressure from the bar are generated at the one end due to a difference in thermal expansion coefficient between the base and the bar. A method of manufacturing a resin tube with a cap, wherein the outer peripheral surface of the one end is held by pressure on the inner peripheral surface of the cap, and the resin tube and the other resin tube are fused and united.   The method for manufacturing a resin tube with a cap according to claim 13, wherein the core is made of a water-soluble material, and the core is dissolved and removed after the heating step.   15. The heating step is performed by bagging the resin tube or the resin tube constituent material and the base, the bar, and other jigs attached thereto, and heating and pressurizing with an autoclave. The manufacturing method of the resin pipe with a cap as described in any one of them.

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