TWI712488B - Manufacturing device and method of thermoplastic composite pipe - Google Patents

Abstract

The invention includes: a mandrel is an inner mold core with a tubular surface and an inner diameter, the inner diameter is provided with an outer low and inner high inclined surface near the two ends, a polygonal brake hole is arranged in the middle of the inner diameter, and the mandrel runs from a plurality of longitudinal axes The composite pieces are assembled and covered with carbon fiber prepreg on the surface of the mandrel; an internal pressure mechanism is set on the inner diameter of the mandrel, and pressure can be applied to these composite sheets radially outward from the inner diameter; a heating mechanism is provided In the internal pressure mechanism; and a pair of upper and lower molds. After the molds are closed, there is a cavity corresponding to the mandrel, which can be used for the mandrel to be inserted and fastened to the upper and lower molds. The upper and lower molds are respectively provided with multiple water channels The hole is used to pour the circulating liquid to cool the upper and lower molds, and the resin of the carbon fiber prepreg is melted and joined by pressure and heating to produce a thick thermoplastic composite pipe.

Description

Manufacturing device and method of thermoplastic composite pipe

The invention relates to a manufacturing device and method of a thermoplastic composite pipe, in particular to an inner mold core that can be embedded with a heating rod, so that the upper and lower molds do not need to be provided with a heating source, can simplify the mold, improve the structural strength of the mold and increase the heating energy .

Chinese patent CN107081922A discloses a large-caliber thermoplastic composite material long-distance pipe and its manufacturing method and device. Thermoplastic polymer filaments and reinforcing fibers are coiled on a reel or tray, and a motor is driven to drive the reel and tray to discharge the filaments. The roller maintains proper tension, and then the wire feed motor guides the two into the 3D printer head through the two guide tubes, where the reinforcing fiber is introduced into the hollow screw channel inside the 3D printer head, and the polymer filament is introduced into the head cavity and wound On the screw. The automatic control system established by the dynamic torque sensor adjusts the tensioning device and the speed of the wire feeding motor, so as to precisely control the wire feeding amount in the 3D printer head and improve the accuracy of pipe molding. The polymer wire is heated and melted inside the printer head, and the molten resin is The thrust of the screw and wire reaches the nozzle. The reinforcing fiber is impregnated and coated with molten resin at the nozzle, and then extruded from the nozzle to form a composite fiber yarn. The overall device and reel of the 3D printer head are fixed on a turntable device that can rotate around the pipe axis, and the printer head can move to a certain extent along the pipe radial direction on the turntable. The mandrel can move back and forth along the pipe axis. By adjusting the rotation of the large plate, the moving speed of the printer head and the mandrel and other parameters control the printing process of the composite fiber yarn on the inner liner. There are two or more identical rotary printing devices on the entire pipeline enhancement layer production line. Then print layer by layer, and finally get To reinforced pipe fittings.

The aforementioned technology does not require the use of metal materials, and has the characteristics of light weight, high temperature resistance, corrosion resistance, good flexibility, good air tightness, high internal and external pressure levels, and convenient installation. Its inner wall is smooth, large diameter, and high internal and external pressure levels. High flow rate and flow rate can be obtained, which is especially suitable for applications in long-distance oil and gas pipelines, but not suitable for applications in the fields of short molding cycles and high impact strength.

The main purpose of the present invention is that the inner mold core shaft can be embedded in the heating mechanism, and the upper and lower molds of the outer covering can reduce the mold, improve the structural strength of the mold and save heating energy without adding a heat source.

Another object of the present invention is to apply internal pressure to the carbon fiber prepreg covering the outer peripheral surface of the inner mold core mandrel, and the pressure can be adjusted to cope with different manufacturing processes.

Another object of the present invention is to splice a plurality of composite pieces to form a mandrel. These composite pieces can move radially. In addition to moving outward to apply internal pressure to the carbon fiber prepreg, they can also move inward to facilitate separation. Demould and take out the pipe material.

To achieve the above objective, the present invention discloses a thermoplastic composite pipe manufacturing device, which includes: a mandrel, an internal pressure mechanism, a heating mechanism and a pair of upper and lower molds, the mandrel is an inner mold core with a Tubular surface and an inner diameter, the inner diameter is provided with an outer low and inner high slope near the two ends, the inner diameter has a polygonal brake hole, and the mandrel is assembled by a plurality of longitudinally-oriented composite sheets. The internal pressure mechanism is set on the inner diameter of the mandrel, the inner diameter can be used to apply pressure to the composite pieces radially outward; the heating mechanism is set on the internal pressure mechanism; the pair of upper and lower The mold has a cavity corresponding to the tubular surface of the mandrel after the mold is closed, which can be used for the mandrel, The internal pressure mechanism placed in the mandrel and the heating mechanism placed in the internal pressure mechanism are inserted and fastened to the upper and lower molds, the upper mold and the lower mold are respectively provided with a plurality of water passage holes, It is used to pour the circulating liquid to cool the upper and lower molds.

Wherein, the internal pressurizing mechanism includes: a fixed lock rod assembled in the brake hole of the spindle, two tapered rods respectively arranged at both ends of the inner diameter of the spindle, and a screw thread passing through the tapered rod , The screw is screwed with the fixed locking rod, and when the screw is screwed inward, it will push the conical rod to move toward the fixed locking rod to expand the inner diameter of the mandrel outwards.

Wherein, the cross section of the tubular surface of the mandrel can be any of a long cone shape and a drop shape.

The present invention also discloses a method for manufacturing a thermoplastic composite pipe, which includes:

A: Provide the manufacturing device of the above-mentioned thermoplastic composite pipe;

B: Surround and splice these composite pieces into a mandrel;

C: The internal pressure mechanism is inserted into the inner diameter of the mandrel;

D: After heating a carbon fiber prepreg at a temperature of 80°~130° Celsius to soften it, it is first wrapped on the surface of the mandrel along the mandrel to form a tube shape;

E: Put the mandrel into the cavity of the upper and lower molds, and close the molds to lock the upper and lower molds;

F: Tighten the screw of the internal pressure mechanism and move toward the fixed lock rod inside the mandrel to generate internal pressure on the carbon fiber prepreg;

G: Raise the heating mechanism to heat the carbon fiber prepreg. The heating mechanism heats at a temperature of 150°~250°C for 5 minutes to 10 minutes;

H: In the clamping state, pour the circulating liquid into these waterway holes to make Cooling of the upper and lower molds and the carbon fiber prepreg;

I: After the temperature of the upper and lower molds are lowered to room temperature, the molds are opened and the thermoplastic composite pipe formed into the shape of the pipe material is taken out.

The present invention has at least the following advantages:

1. The present invention can use the torque wrench to rotate the screw to drive the tapered rod to move to resist the combined sheet to expand outward. The pressing force can be adjusted to cope with different manufacturing processes and the pressure holding pressure on the pipe wall is uniform. The pressure can be calculated and measured by the torque wrench tool of the rotating screw.

2. Because the heating rod of the heating mechanism of the present invention is embedded in the hole formed by the first groove of the tapered rod and the second groove of the composite sheet, and leads to the inside of the composite sheet, the upper mold and the The lower mold does not need to add a heating source, which can reduce the structure of the mold and improve the structural strength of the mold, as well as heat transfer from the inside to the outside, direct contact with the pipe, small heating volume, saving heating energy, and achieving rapid heating effect.

3. The present invention can embed metal sheets and metal rings in local areas when the carbon fiber prepreg is wrapped along the mandrel into a tube shape, which will enable the local area of the thermoplastic composite tube to have a strength reinforcement function.

4. In the present invention, since the upper and lower molds do not need to be provided with heating sources, the upper and lower molds have enough space for cooling water passage holes, and the number density can be more dense to improve the cooling speed and effect.

5. The present invention can be used in experimental trials, because it can continuously control the pressure of the pipe wall, and the pressure is ≧30~50kg/cm ² , which is larger than the general air pressure (≦10kg/cm ² ) , Don’t worry about the safety factor of high-pressure gas leakage and injury.

6. The layer and layer of the thermoplastic composite pipe made by the present invention have no bubble production Raw, good fit and compactness, which can effectively improve the strength performance.

7. The mandrel system of the present invention is formed by surrounding and splicing a plurality of composite pieces, which can be moved radially by the movement of the tapered rod, so that the finished pipe after forming is easy to demold.

8. The invention adopts a steel mold design, has heat resistance and is not easily damaged, and is suitable for practical production. Through the mandrel with special-shaped cross-section, it can be suitable for the production of thermoplastic composite pipes with different special-shaped cross-section shapes.

10‧‧‧Mandrel

11‧‧‧Tube surface

12‧‧‧Inner diameter

121‧‧‧Brake hole

13‧‧‧Slope

14‧‧‧Combination film

141‧‧‧Second groove

20‧‧‧Internal pressure mechanism

21‧‧‧Conical rod

22‧‧‧Fixed lock lever

221‧‧‧First groove

222‧‧‧Perforation

23‧‧‧Hole

24‧‧‧Screw

241‧‧‧Head

30‧‧‧Heating mechanism

31‧‧‧Heating Rod

40‧‧‧Upper mold

41‧‧‧Waterway hole

42‧‧‧Through hole

50‧‧‧Lower mold

51‧‧‧Waterway hole

52‧‧‧Screw hole

60‧‧‧Carbon fiber prepreg

a‧‧‧Mould cavity

100‧‧‧Metal sheet

200‧‧‧Metal Ring

Steps A to I‧‧‧The manufacturing method of the thermoplastic composite pipe of the present invention

Fig. 1 is an exploded perspective view of a mandrel and an internal pressing mechanism according to a first embodiment of the present invention.

Fig. 2A is a combined perspective view of the mandrel and the internal pressing mechanism according to the first embodiment of the present invention.

Fig. 2B is a cross-sectional view of the A-A cutting line of Fig. 2A.

Fig. 3 is a schematic diagram of a heating rod assembled between the mandrel and the internal pressure mechanism in the first embodiment of the present invention.

4 is a schematic diagram of the mandrel placed in the lower mold according to the first embodiment of the present invention.

5A is a schematic diagram of the upper and lower molds after they are closed in the first embodiment of the present invention.

Fig. 5B is a cross-sectional view of the B-B cutting line of Fig. 5A.

Fig. 6 is a perspective view of a second embodiment of the invention.

Fig. 7 is a three-dimensional schematic diagram of a third embodiment of the present invention.

Fig. 8 is a perspective view of a fourth embodiment of the present invention.

Figure 9 is a flowchart of the present invention.

With regard to the detailed content and technical description of the present invention, examples are now used for further description, but it should be understood that these examples are for illustrative purposes only and should not be interpreted as Restrictions on the implementation of the invention.

Please refer to Figure 1, Figure 2A, Figure 2B, Figure 3, Figure 4, Figure 5A, Figure 5B, the first embodiment of the manufacturing apparatus of the thermoplastic composite pipe of the present invention, including: a mandrel 10, an internal plus The pressing mechanism 20, a heating mechanism 30, an upper mold 40 and a lower mold 50. The mandrel 10 is an inner mold core with a circular tubular surface 11 and a polygonal inner diameter 12. The inner diameter 12 is provided with an outer low and inner high inclined surface 13 near the two end faces of the mandrel 10. The middle section of the diameter 12 is provided with a brake hole 121 in a polygonal shape such as a hexagon. The mandrel 10 is formed by surrounding and splicing a plurality of composite sheets 14 with the longitudinal axis direction. The tubular surface 11 of the mandrel 10 is covered with a layer of carbon fiber Prepreg 60.

The internal pressure mechanism 20 is arranged on the inner diameter of the mandrel 10, and the inner diameter 12 of the mandrel 10 can apply pressure to the composite pieces 14 radially outward. The internal pressure mechanism 20 includes two tapered rods 21 sleeved on the inner diameter 12 at both ends of the mandrel 10 and a polygonal locking rod 22 between the two tapered rods 21. The fixed locking rod The shape of 22 matches with the brake hole 121 of the spindle 10 and is assembled at the position of the brake hole 121. The tapered rod 21 is polygonal and has a larger diameter than the outer end of the tapered rod 21 adjacent to the fixed lock rod. The diameter of the inner end of the tapered rod 21 is the diameter of the inner end of the tapered rod 21. The outer end of the tapered rod 21 is annularly arranged with a plurality of semicircular first grooves 221. The axial center of the tapered rod 21 is provided with a through hole 222; the composite piece 14 faces the first groove A semicircular second groove 141 is provided in the 221 direction. The first groove 221 and the second groove 141 are aligned to form a hole 23. The hole 23 penetrates into the middle of the composite sheet 14. The two fixing rods 22 Each side is screwed with a screw 24. The screw 24 has a head 241 larger than the diameter of the screw 24. The screw 24 passes through the hole 222 of the conical rod 21 and then is screwed with the locking rod 22. The head 241 of the screw 24 is tight Against the end surface of the tapered rod 21, when the rotating locking screw 24 is screwed inward, the tapered rod 21 will be pushed to move toward the fixed locking rod 22 to expand the inner diameter 12 of the spindle 10 outwards. , The outer wall of the tapered rod 21 exerts pressure on the composite sheet 14.

The heating mechanism 30 includes a plurality of ring-shaped heating rods 31, which are embedded in the holes 23 formed by the first groove 221 of the tapered rod 21 and the second groove 141 of the composite sheet 14 , And extend into the middle of the composite sheet 14.

The upper mold 40 and the lower mold 50 are respectively provided with a plurality of water passage holes 41, 51 that can be filled with circulating liquid to cool the upper and lower molds 40, 50. The upper mold 40 and the lower mold 50 have corresponding A mold cavity a on the tubular surface of the mandrel 10 is provided for the mandrel 10 to be placed in. In this embodiment, the upper mold 40 and the lower mold 50 are inserted through the through holes 42 of the upper mold 40 by a plurality of screws 70, and then screwed with the screw holes 52 of the lower mold 50, thereby making the upper mold 40 and the lower mold 50 is combined together, and before the mandrel 10 is placed in the lower mold 50, an internal pressure mechanism 20 has been installed inside the mandrel 10, and a heating mechanism 30 has been installed between the internal pressure mechanism 20 and the mandrel 10.

With the above structure, during operation, the locking rod 22 is located in the middle of the inner diameter 12 of the mandrel 10, and the two tapered rods 21 are respectively sleeved on the two ends of the inner diameter 11 of the mandrel 10. The two tapered rods 21 The through holes 222 respectively penetrate the screw rod 24, and the screw rod 24 is screwed with the locking rod 22.

The carbon fiber prepreg 60 is heated at a temperature of 80°-130° Celsius to soften it, and then wraps the outer peripheral surface of the mandrel 10 along the mandrel 10 into a tubular shape.

The mandrel 10 is then placed in the half cavity of the lower mold 50, and then the upper mold 50 is placed above the mandrel 10 and the upper mold 40 is aligned with the lower mold 50, and then the upper mold 40 is separated by a plurality of screws 70 The through hole 42 is inserted into the screw hole 52 of the lower mold 50 and locked. Next, a torque wrench is used to rotate the screw 24. The head 241 of the screw 24 pushes the tapered rod 21 to move toward the fixed lock rod 22 to expand the inner diameter of the mandrel 10 outwards, thereby creating an inner diameter for the carbon fiber prepreg 60 The heating rod 31 of the heating mechanism 30 is heated to 150°~250° Celsius by electric power. After a period of about 5 minutes to 10 minutes, the resin of the carbon fiber prepreg 60 is melted and joined, and then the mold 40 and Waterway hole of lower mold 50 41 and 51 are filled with circulating liquid to cool the upper and lower molds 40 and 50. When the temperature drops to normal temperature, the upper and lower molds 40 and 50 can be opened to take out the pipe material.

Please refer to FIG. 6 again, which is a second embodiment of the manufacturing device of the thermoplastic composite pipe of the present invention. When the carbon fiber prepreg 60 is wrapped into a pipe shape along the tubular surface 11 of the mandrel 10, by the way The partial area of the surface of the tubular surface 11 is embedded with the metal sheet 100, the metal ring 200 and other objects, which can strengthen the local area of the thermoplastic composite pipe.

Please refer to FIG. 7 again, which is the third embodiment of the manufacturing device of the thermoplastic composite pipe of the present invention, wherein the tubular surface 11 of the mandrel 10 may be a long tapered section.

Please refer to FIG. 8 again, which is a fourth embodiment of the manufacturing device of the thermoplastic composite pipe of the present invention, wherein the cross section of the tubular surface 11 of the mandrel 10 may be a drop shape.

The present invention has at least the following advantages:

1. The present invention can use a torque wrench to rotate the screw 24 to drive the tapered rod 21 to move to resist the combined sheet 14 to expand outward, and its pressing force can be adjusted to cope with different manufacturing processes and hold pressure on the pipe wall The pressure is uniform, and the pressure can be calculated and measured by the torque wrench tool of the rotating screw 24.

2. Because the heating rod 31 of the heating mechanism 30 of the present invention is embedded in the hole 23 formed by the first groove 221 of the tapered rod 21 and the second groove 141 of the composite sheet 14 and extends to the composite sheet 14 In the middle, the upper mold 40 and the lower mold 50 do not need to add a heating source, which can reduce the structure of the mold and improve the structural strength of the mold, as well as heat transfer from the inside to the outside, direct contact with the pipe, small heating volume, and saving heating energy. Achieve rapid heating effect.

3. The present invention can embed the metal sheet 100 and the metal ring 200 in a local area when the carbon fiber prepreg 60 is wrapped along the mandrel 10 into a tube shape, which will make the thermoplastic composite tube localized The partial area is used for strength reinforcement.

4. In the present invention, since the upper and lower molds 40 and 50 do not need to be provided with heating sources, there is enough space for cooling water passage holes 41 and 51, and even the number density that can be set can be increased to improve the cooling speed and effect .

5. The present invention can be used in experimental trials, because it can continuously control the pressure of the pipe wall, and the pressure is ≧30~50kg/cm ² , which is larger than the general air pressure (≦10kg/cm ² ) , Don’t worry about the safety factor of high-pressure gas leakage and injury.

6. The thermoplastic composite pipe made by the present invention has no air bubbles in the layers and layers, has good adhesion and compactness, and can effectively improve the strength performance.

7. The mandrel 10 of the present invention is formed by surrounding and splicing a plurality of composite pieces 14, which can be radially displaced by the movement of the tapered rod 21, so that the finished pipe after forming is easy to demold.

8. The invention adopts a steel mold design, has heat resistance and is not easily damaged, and is suitable for practical production. Through the mandrel with special-shaped cross-section, it can be suitable for the production of thermoplastic composite pipes with different special-shaped cross-section shapes.

Please refer to Figure 9, the present invention discloses a method for manufacturing a thermoplastic composite pipe, including:

A: Provide the manufacturing device of the above-mentioned thermoplastic composite pipe;

B: Surround and splice these composite pieces 14 into a mandrel 10;

C: Insert the internal pressure mechanism 20 into the inner diameter 12 of the mandrel 10;

D: A carbon fiber prepreg material 60 is heated at a temperature of 80°-130° Celsius to soften it, and then wraps the tubular surface 11 of the mandrel 10 along the mandrel 10 to form a tube shape;

E: Place the mandrel 10 in the cavity a of the upper and lower molds 40, 50, and close the molds to lock the upper and lower molds 40, 50;

F: Tighten the screw 24 of the internal pressure mechanism 20 to move the screw 24 toward the locking rod 22 of the inner diameter 12 of the mandrel 10 to generate internal pressure on the carbon fiber prepreg 60;

G: Raise the heating mechanism 30 to heat the carbon fiber prepreg 60. The heating mechanism 30 heats the inside of the tube of the carbon fiber prepreg 60 in the shape of a tube. The heating method is at a temperature of 150°C. Heating at 250° for 5 minutes to 10 minutes;

H: In the clamping state, pour the circulating liquid into the waterway holes to cool the upper and lower molds and the carbon fiber prepreg;

I: After the temperature of the upper and lower molds are lowered to room temperature, the molds are opened and the thermoplastic composite pipe formed into the shape of the pipe material is taken out.

After the heating in the above step G is completed, after a period of time (for example, after 5 minutes to 10 minutes), then the step H is started.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, all simple equivalent changes and modifications made in accordance with the scope of the patent application and the description of the invention are all It is still within the scope of the invention patent.

10‧‧‧Mandrel

11‧‧‧Tube surface

12‧‧‧Inner diameter

121‧‧‧Brake hole

13‧‧‧Slope

14‧‧‧Combination film

141‧‧‧Second groove

20‧‧‧Internal pressure mechanism

21‧‧‧Conical rod

22‧‧‧Fixed lock lever

221‧‧‧First groove

24‧‧‧Screw

241‧‧‧Head

31‧‧‧Heating Rod

Claims (7)

A manufacturing device for a thermoplastic composite pipe includes: a mandrel, which is an inner mold core, has a tubular surface and an inner diameter, the inner diameter is close to the slopes at both ends, and the inner diameter has a polygonal brake hole , The mandrel is surrounded by a plurality of longitudinally-oriented composite sheets; an internal pressure mechanism is arranged on the inner diameter of the mandrel, and the inner diameter can be applied to the composite sheets radially outward Pressure, the internal pressure mechanism includes: a set of fixed locking rods fitted in the brake hole of the mandrel, two tapered rods respectively arranged at both ends of the inner diameter of the mandrel, and a screw passing through the tapered rod , The screw threaded with the fixed locking rod, when the screw is screwed in, it will push the conical rod to move toward the fixed locking rod to expand the inner diameter of the spindle outwards; a heating mechanism, Set in the internal pressure mechanism; a pair of upper and lower molds have a cavity corresponding to the tubular surface of the mandrel after the molds are closed, for the mandrel and the internal pressure mechanism placed in the mandrel , The heating mechanism placed in the internal pressure mechanism is inserted and fastened the upper and lower molds. The upper mold and the lower mold are respectively provided with a plurality of water passage holes for filling the circulating liquid to make the upper and lower molds. The mold is cooled down. According to the manufacturing device of the thermoplastic composite pipe described in item 1 of the scope of patent application, wherein the outer end of the tapered rod is annularly arranged with a plurality of semicircular first grooves, and each composite piece faces the first groove A semicircular second groove is provided in the direction of a groove, the first groove and the second groove are aligned to form a hole, the hole penetrates into the middle of the composite sheet, and the heating mechanism includes a plurality of annular arrangements The heating rods are embedded in the holes formed by the first groove of the tapered rod and the second groove of the composite sheet, and extend into the middle of the composite sheet. The manufacturing device of the thermoplastic composite pipe as described in item 1 of the scope of patent application, wherein the pipe of the mandrel The cross-section of the surface is long cone or drop shape. A method for manufacturing a thermoplastic composite pipe includes the following steps: A: Provide a manufacturing device for a thermoplastic composite pipe as in Patent Claim 1; B: Surround and splice the composite sheets into a mandrel; C: The internal pressure mechanism is inserted into the inner diameter of the mandrel; D: After heating a carbon fiber prepreg material to soften it, it wraps the surface of the mandrel along the mandrel to form a tube shape: E: Place the mandrel into the cavity of an upper and lower mold, and close the mold to lock the upper and lower molds; F: twist the screw of the internal pressure mechanism so that the conical rod faces the inner part of the mandrel The fixed lock rod moves to generate internal pressure on the carbon fiber prepreg; G: heating up the heating mechanism to heat the carbon fiber prepreg; and H: in the clamping state, pour the circulating liquid into the water passage holes , Cooling the upper and lower molds and the carbon fiber prepreg; and I: After the temperature of the upper and lower molds is lowered to normal temperature, the mold is opened and the thermoplastic composite tube formed into a tube shape is taken out. The method for manufacturing a thermoplastic composite pipe described in item 4 of the scope of patent application, wherein the carbon fiber prepreg is heated at a temperature of 80°~130°C to soften it. The method for manufacturing a thermoplastic composite pipe described in item 4 or item 5 of the scope of the patent application, wherein in step G, the heating temperature is 150°-250° Celsius for 5 minutes to 10 minutes. The method for manufacturing a thermoplastic composite pipe as described in item 4 of the scope of patent application, wherein in step D, after a carbon fiber prepreg is heated to soften it, the core is covered along the mandrel When forming a tube shape on the shaft surface, metal can be embedded in a partial area of the tube shape at the same time The sheet and metal ring will strengthen the local area of the thermoplastic composite pipe.

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