KR100678601B1 - Frp pipe forming device and forming process - Google Patents

Abstract

An apparatus and a method for forming an FRP pipe are provided to maintain the stability of a uniform size by forming the FRP pipe through upper and lower molds and a core. An apparatus for forming an FRP comprises a base(4), a column, an upper mold(12), a slider, a core(30), a lower mold(32), a support cylinder(34), a pump, and a control unit. The column includes a guide rail on the front surface thereof. The upper mold includes an external heater. The slider is engaged with the guide rail in a slipping manner. The core is installed on the front surface of the slider. The lower mold is located at a lower portion of the core and is engaged with the upper mold. The lower mold includes an external heater. The support cylinder is installed on the bottom surface of the lower mold and is fixed to the base. The pump is connected to the support cylinder. The control unit connects the pump and the external heater. A hopper section is formed at a central portion of the upper mold. A pressing cylinder equipping with a pusher is installed on the upper side of the hopper section and is connected to the pump.

Description

FRP pipe forming device and forming process

1 is a state diagram showing a conventional technology.

2 is a front view showing a molding apparatus according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a perspective view showing the core of the molding apparatus according to the present invention.

5 is an exploded perspective view showing the core of the molding apparatus according to the present invention.

6 is a plan view of the core is installed in the molding apparatus according to the present invention.

FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6. FIG.

8 is a cross-sectional view taken along the line C-C in FIG.

9 is a hydraulic circuit diagram of a molding apparatus according to the present invention.

10 is a flow chart of a molding apparatus according to the present invention.

11a to 11g are operational state diagrams in accordance with the present invention.

* Explanation of symbols for the main parts of the drawings

2: molding machine 4: base

6: column 8: guide rail

10: stopper 12: upper mold

14: Hopper unit 16: External heater

18,62: Pusher 20,54,58,68: Rod

22: pressure cylinder 24: support bracket

26: Slider 30: Core

32: lower mold 34: support cylinder

36: upper core 38: upper mold

40: bottom core 42: bottom plate mold

44: side core 46: protrusion

48: board 50: internal heater

52: side cylinder 56: lower cylinder

57, 60: Bracket 66: Working cylinder

72: first direction control valve 74: second direction control valve

76: third direction control valve 78: fourth direction control valve

80: fifth directional control valve 82: pump

84: control unit 88: skeletal muscle

The present invention relates to an FRP (fiber glass reinforced plastics) tube forming apparatus and a molding method, and more specifically, a large size of the FRP tube through the upper and lower molds and the core constituting the forming apparatus. It can be molded into a mold, which greatly improves the productivity and quality, and also the bulk of the glass fiber, the polymer, the silica sand, the hardener, the filler, and the like, together with the skeletal muscle, is used to form the FRP tube. The present invention relates to a FRP pipe forming apparatus and a molding method which have excellent corrosion resistance and durability, tensile strength and compressive strength.

In general, sewage pipes are constructed to be divided into sewage treatment pipes and rainwater treatment pipes. The sewage and rainwater treatment pipes have been mainly used as concrete fume pipes, but the sewage treatment pipes are excessive from various factory facilities. When the erosive wastewater is discharged, the corrosiveness is advanced inside the fume pipe due to the influence of acidic substances, which results in a defect.

In addition, in order to solve the above-mentioned defects of the fume pipes, the synthetic resin pipes were sometimes used for sewage. However, these synthetic resin pipes have a weak compressive strength and easily break, and also have weaknesses that need to be frequently exchanged due to their corrosiveness.

Therefore, in recent years, FRP (polymer concrete tube) is manufactured including bulk and reinforcing bar mixed with FRP, polymer, silica sand, hardener, filler, etc. to satisfy both corrosion resistance, durability, tensile strength and compressive strength. The production of water and sewage pipes is emerging as a key issue.

On the other hand, the prior art patent patent No. 408699 "Method for manufacturing a polymer concrete centrifugal force tube" in Figure 1, first, the centrifugal force tube mold is configured to rotate at high speed, the centrifugal force tube mold outer peripheral roller coupled to the shaft Closely installed to transmit power.

A centrifugal force tube mold configured as described above is provided with a blower 30 for blowing high-temperature, high-pressure air.

Referring to the process of manufacturing a centrifugal force tube which is a fume tube using the conventional technique configured as described above are as follows.

First, the mixed material is introduced into the centrifugal force tube mold, and then, when the power is transmitted to the shaft, the roller rotates to transmit power to the centrifugal force tube mold, wherein the mixed material is formed by the centrifugal force of the rotating centrifugal force tube mold. It will rotate while attached to the wall.

When the blower 30 is operated in the above state to blow high-temperature, high-pressure air into the centrifugal force tube mold, the mixed material flocked to the inner wall side of the centrifugal force tube mold is rapidly hardened to be made into the centrifugal force tube 20. .

The prior art described above has the drawback that the durability and thickness of the centrifugal force tube 20 are changed by the rotational speed of the centrifugal force tube mold, and the productivity is lowered while the uniformity of the quality is reduced, and the inside of the centrifugal force tube mold is also introduced. There is a problem that requires skill to keep the amount of bulk constant.

Another problem is that the main part of the centrifugal force pipe 20 through which the upper and the sewage passes is roughly formed so that fresh water clams are parasitic in the tap water, and sewage such as sludge is adsorbed in the sewage pipe.

The present invention has been made to solve the above problems, the FRP tube (polymer concrete tube) according to the present invention is smooth and constant thickness and the surface state of the inside and outside the FRP tube through the molding apparatus (mould) Since it is molded to a length, it is possible to maintain the stability of the uniformly innovative dimensions, the purpose is to be able to repeatedly produce a large amount of high quality FLP pipes with a minimum standard error.

 Technical configuration of the present invention for achieving the above object, the base 4, the column 6 provided with a guide rail 8 at the front while being installed perpendicular to the base 4, and the column 6 The upper mold 12 having an external heater 16 fixedly installed at the upper end, a slider 26 that is slip coupled to the guide rail 8, and a core 30 installed on the front of the slider 26. And a lower mold 32 positioned below the core 30 and engaged with the upper mold 12 and having an external heater 16 and fixed to the base 4 while being installed on the bottom surface of the lower mold 32. In the molding apparatus 2 composed of a support cylinder 34, a pump 82 connected to the support cylinder 34, and a control unit 84 for connecting the pump 82 and the external heater 16 A pressurized cylinder 22 having a hopper portion 14 penetrated at the center of the upper mold 12 and having a pusher 18 above the hopper portion 14 is provided. As the installation is characterized in that connected to the pump 82.

Inserting the skeletal muscles 88 in the shape of an F-Al tube around the core 30 including the upper and lower cores 36 and 40 and the side cores 44 provided with the inner heater 50; Since the upper mold 12 having the hopper portion 14 formed thereon while having the external heater 6 thereon, the lower mold 32 provided with the external heater 6 is raised to raise the core 30 and the core 30. Engaging together; Since the bulk is put into the hopper portion 14 to be injected into the upper and lower molds (12,32) while being molded in the shape of F-Al tube; After the bulk is injected into the upper and lower molds (12, 32) is heated by the internal and external heaters 16, 50 that are heated inside, and the lower mold 32 and the core 30 thereafter Separating the upper mold 12 from the upper mold 12, and then separating the lower mold 32 from the core 30, and then, the side core 44 and the lower core 40 are separated from the core ( 30) it is characterized in that it comprises a step to be separated from the product by reversing inward, and then the pusher 62 to advance the product is separated from the core (30).

Referring to the present invention configured as described above in Figures 2 to 8, first, a molding apparatus 2 (see Fig. 2) for forming a FRP tube (polymer concrete tube) is a base (4) After the base 4, a column 6 is vertically installed at the rear of the base 4, and a guide rail 8 is formed at the front thereof, and a middle portion of the guide rail 8 is supported. A stopper 10 is formed.

An upper mold 12 is fixedly installed at an upper end of the column 6. A middle portion of the upper mold 12 is formed by penetrating a hopper 14 through which a bulk can be introduced, and the upper mold 12. The inside of the hopper 14 is provided with an external heater 16 that provides heat to the product to be cured early, and a pusher 18 is installed on the upper portion of the hopper 14 to push the bulk into the upper mold 12. And, the pusher 18 is coupled to the rod 20 of the pressure cylinder 22, the pressure cylinder 22 is installed in the upper mold 12 as a support bracket 24 (see Fig. 2).

In addition, a slider 26 is slidably coupled to the guide rail 8 and positioned at the top of the stopper 10, and a core 30 is formed on the front of the slider 26 to form an FRP tube. ) Is installed, and the lower mold 32 (see FIG. 3) engaged with the upper mold 12 is installed at the lower portion of the core 30 while having an external heater 16. A support cylinder 34 is provided to provide an action force to move up and down, and the support cylinder 34 is fixed on the base 4.

The core 30 (see FIG. 5) installed as described above includes an upper core 36 fixed to the front of the slider 26, and the upper core 36 is formed of a semi-circular upper plate mold 38. While the other end is welded to the front of the slider 26 is fixed.

The lower core 40 is positioned at a position opposite to the upper core 36, and the lower core 40 is formed of a lower plate mold 42 having a semicircular shape and separated from the upper core 36 and the slider 26. It is located.

In addition, both sides between the upper and lower cores 36 and 40 are provided with side cores 44 covering the gaps, respectively, which are sandwiched between the upper and lower cores 36 and 40. The projections 46 arranged in the lateral direction are formed, and the boards 48 contacting the inner surfaces of the upper and lower cores 36 and 40 are integrally formed while being disposed in the lateral direction at the rear of the protrusions 46.

Therefore, when the upper and lower cores 36 and 40 and the side cores 44 are coupled to each other, a cylindrical shape is formed as a whole.

The upper plate mold 38 (see FIG. 3) and the lower plate mold 42, which are configured as described above, are provided with internal heaters 50 to be cured early by providing heat to the molded products.

Subsequently, the ends of the rods 54 provided on both sides of the side cylinder 52 providing an action force are coupled to the inner surface of the board 48 of the both side core 44 (see FIG. 5), and the side cylinder 52 In the upper part, the fixed bracket 57 is welded to the inner surface of the upper plate mold 38. As a result, the side cylinder 52 is fixed to the upper core 36, and the side core 44 is fixed to the side cylinder. The rod 54 of 52 makes it move forward and backward.

In addition, a lower cylinder 56 providing an action force is installed on the inner surface of the lower plate mold 42 of the lower core 40 while engaging the lower end of the rod 58, and the bracket 60 fixed to the upper end of the lower cylinder 56. Silver is welded to the inner surface of the upper mold 38, which causes the lower cylinder 56 is installed vertically in the upper mold 38.

Accordingly, the lower core 40 is fixed to the upper core 36 together with the lower cylinder 56, and the lower core 40 is lifted by the rod 58 of the lower cylinder 56. .

The upper core 36 installed as described above has a structure in which the other end is fixed to the slider 26, and the side core 44 and the lower core 40 are brackets 57 below the upper core 36, respectively. , 60) is to be moved forward, backward and elevating, which results in the finished product in the core 30 is formed in the FRP pipe (polymer concrete pipe) is in a state that can be easily separated.

Subsequently, the core 30 (see FIG. 4) is coupled to the pusher 62 which separates the finished product to the outside while being formed in a circular shape, and is installed at the front of the slider 26. Both sides of the pusher 62 are provided. The front end of the rod 68 provided in the working cylinder 66 is welded and fixed, respectively, the working cylinder 66 is welded and fixed to both sides of the slider 26, respectively.

Accordingly, the working cylinder 66, the pusher 62, and the core 30 are raised and lowered together with the slider 26.

A guide rod 71 is vertically fixed to one side of the base 4 (see FIG. 2) and the upper mold 12, and a mass 73 formed at one side of the lower mold 32 is provided at the guide rod 71. ) Is slidingly coupled.

Meanwhile, the side cylinder 52 (see FIG. 9) and the lower cylinder 56 installed in the core 30 constituting the molding apparatus 2 (see FIG. 3) as described above are provided with first and second directional control valves 72, respectively. (74) is connected, and a third directional control valve (76) is connected to the support cylinder (34) installed in the lower mold (32), and the pressurized cylinder located above the upper mold (12) (see FIG. 3). A fourth directional control valve 78 is connected to the 22.

In addition, a fifth directional control valve 80 is connected to the working cylinder 66 (see Fig. 9) provided on both sides of the slider 26 (see Fig. 2).

The first, second, third, fourth, fifth directional control valves 72, 74, 76, 78, and 80 configured as described above are connected to a pump 82 for supplying a high pressure oil, and to the pump 82 A control unit 84 for transmitting an operation command is connected, and the control unit 84 is connected with first, second, third, fourth and fifth directional control valves 72, 74, 76, 78, and 80.

Therefore, the first, second, third, fourth, fifth directional control valves 72, 74, 76, 78, 80 are operated by a command transmitted from the control unit 84 while receiving oil from the pump 82 The oil is supplied to the pressure cylinder 22, the side cylinder 52, the lower cylinder 56, the support cylinder 34, and the working cylinder 66, respectively.

Unexplained reference number 88: skeletal muscle

Referring to the operation of the technology of the present invention configured as described above are as follows.

First, the skeletal muscles 88 made by reinforcing the reinforcement in the form of FRP pipes are fitted into the core 30 as shown in FIG. 11A, and then coupled to each other, and not shown in the menu plate of the forming apparatus 2 (see FIG. 2). When the operation mode is selected, the control unit 84 (see FIG. 9) transmits an operation command as shown in the flowchart shown in FIG. 10.

Accordingly, the pump 82 is turned on by the command transmitted from the controller 84, the first and second directional control valves 72 and 74 are turned on, and the internal and external heaters 16 and 50 are turned on. S1)

When the pump 82 is turned on as described above, the oil is supplied at high pressure, and the oil is supplied to the side cylinder 52 and the lower cylinder 56 while the first and second directional control valves 72 and 74 are turned on. This causes the side cylinder 52 (see FIG. 11A) to move forward while the side core 44 moves outward, and at the same time the lower cylinder 56 operates to lower the lower core 40. 36 remains fixed to the slider 26.

Therefore, the protrusion 46 of the side core 44 is positioned at the lower end of the upper mold 38 of the upper core 36, and the outer surface of the board 48 is in close contact with the inner surface of the upper mold 38. The upper end of the lower plate mold 42 of the lower core 40 is located at the lower end of the protrusion 46.

At this time, the outer surface of the board 48 of the side core 44 is in close contact with the inner surface of the upper end of the lower plate mold 42.

As described above, when the side core 44 is moved outward and the lower core 40 is lowered, the circumferential surface of the upper core 36, the protruding end of the side core 44, and the lower core 40 of the lower core 40 are lowered. Since the circumferences are located on the line coinciding with each other, they form a cylindrical shape as a whole.

In addition, when the internal heater 50 and the external heater 16 are turned on by the command transmitted from the controller 84 and heated to 80-150 ° C., the upper and lower molds 12 and 32 and the core 30 are It is heated by the heat transferred to raise the temperature.

After step S1, the controller 84 (see Fig. 9) transmits an on command to the third direction control valve 76 after one minute has elapsed (S2).

As described above, when the third direction control valve 76 is turned on, the oil supplied to the support cylinder 34 raises the lower mold 32 as shown in FIG. 11B, wherein the lower mold 32 is raised. (See FIG. 2), the mass 73 installed on one side is raised while sliding along the guide rod 71, and the lower mold 32 continuously rising is stayed on the stopper 10. As you push, you rise together.

At this time, the core 30 is raised together with the slider 26 fixed to the other end in the state in which the lower core 40 is located inside the lower mold 32, the slider 26 of the column (6) Ascending along the guide rail (8) and with the action cylinder (66) installed on both sides.

Subsequently, when the lower mold 32 rises together with the core 30 and engages with the upper mold 12, the upper core 36 of the core 30 is positioned inside the upper mold 12. A space portion for providing a predetermined gap from the circumferential surface of the core 30 to the inner surfaces of the upper and lower molds 12 and 32 is provided.

In the above state, the operator injects the prepared bulk into the hopper portion 14 formed in the upper mold 12, as shown in Figure 11c, the bulk is glass fiber, polymer (silica), silica, hardener (epoxy Resin) and fillers (calcium carbonate, stone powder, etc.) are mixed.

Unlike the above, the bulk may not be introduced into the hopper 14, but the operator may directly form the bulk to the skeletal muscle 88 to form an F-Al tube around the core 30.

After the step S2, the controller 84 (see Fig. 9) transmits an on command to the fourth directional control valve 78 after one minute has elapsed (S3).

When the fourth directional control valve 78 is turned on by the command transmitted from the controller 84 as described above, the push cylinder 18 is lowered as shown in FIG. 11D while the pressure cylinder 22 is operated by the supplied oil. Due to this, the bulk injected into the hopper portion 14 is pressed and passed through the upper mold 12, and is supplied to the space formed between the lower mold 32 and the circumference of the hopper portion 14 to the skeletal muscle (88). It will have the form of F-Al tube.

At this time, the bulk located between the upper and lower molds 12 and 32 and the core 30 is hardened by heat transferred from the inner and outer heaters 16 and 50 to form a completed FRP tube.

After the step S3, the control unit (see FIG. 9) transmits an OFF command to the third and fourth directional control valves 76 and 78 after one minute. (S4)

When the third direction control valve 76 is turned off by the command transmitted from the control unit 84 as described above, the support cylinder 34 is operated again to lower the lower mold 32 as shown in FIG. 11E. As a result, the lower mold 32 is lowered while being separated from the upper mold 12 which is engaged, and at the same time, the mass 73 formed on one side of the lower mold 32 (see FIG. 2) is along the guide rod 71. Will descend.

At this time, when the lower mold 32 is lowered, the core 30 is lowered together in the state of being mounted on the upper lower mold 32 by its own weight in a state in which the FRP pipe is coupled around the support point.

When the core 30 is lowered, the slider 26 provided at the other end is lowered along the guide rail 8 formed at the column 6, and at the same time, the working cylinder 66 installed at the rear of the slider 26 is also Will descend together.

When the core 30 and the lower mold 32 descend together as described above, and the slider 26 reaches the stopper 10, the slider 26, the core 30, and the working cylinder 66 stop together. At the same time, the core 30 is separated from the lower mold 32 which continues to descend in the state in which the FRP pipe is coupled. Subsequently, the lower mold 32 which descends returns to its original position while being separated from the core 30.

In addition, when the fourth directional control valve 78 is turned off by a command transmitted from the control unit 84 (see FIG. 9), the pressure cylinder 22 (see FIG. 3) is operated again and the pusher 18 which is lowered is operated. It is detached from the hopper part 14 and returned to an original position.

After the step S4, the controller 84 (see FIG. 9) transmits an OFF command to the first and second directional control valves 72 and 74 one minute later (S5).

As described above, when the first and second directional control valves 72 and 74 are turned off by the command transmitted from the controller 84, the side cylinder 52 and the lower cylinder 56 are operated again. As a result, the side cylinder The side core 44 installed on the rod 54 of the 52 retreats and returns to its original position as shown in FIG. 11F, and the lower core 40 installed on the rod 58 of the lower cylinder 56. Will rise and return to its original position.

Therefore, the projections 46 forming the side core 44 are separated from the gaps between the upper and lower cores 36 and 40 of the upper and lower sheet molds 38 and 42, and the board 48 is upper and lower. It is spaced apart from the inner surfaces of the lower plate molds 38 and 42.

When the lower plate mold 42 is raised by the lower cylinder 56 to operate thereafter, the outer circumferential surface is separated from the inner surface of the FAl tube.

As a result, the FRP pipe coupled to the core 30 has an outer circumferential surface of the rear side core 44 and the rising lower core 40 in the state of being placed on the upper plate mold 38 of the upper core 36. It is separated from.

After step S5, the controller 84 (see FIG. 9) transmits an on command to the fifth direction control valve 80 after one minute has passed (S6).

When the fifth direction control valve 80 is turned on by the command transmitted from the controller 84 as described above, the supplied oil is supplied to the action cylinder 66 to advance the rod 68 as shown in FIG. 11G. do.

Therefore, as the pusher 62 moves forward by the rod 68, the other end of the FRP tube mounted on the upper core 36 is pushed apart from the core 30.

After the step S6, the control unit 84 (see Fig. 9) transmits an off command to the fifth directional control valve 80 one minute later (S7).

When the fifth directional control valve 80 is turned off by the command transmitted from the controller 84 as described above, the working cylinder 66 (see FIG. 4) is operated again to reverse the rod 68. The pusher 62 moves back while being spaced apart from the other end of the FRP tube and returns to the front side of the slider 26.

FRP tube formed and separated as described above is naturally cooled for a predetermined time.

After the step S7, the controller 84 transmits an off command to the pump 82, and transmits an off command to the internal and external heaters 16 and 50.

As described above, when the pump 82 is turned off by the command transmitted from the controller 84, and the internal and external heaters 16 and 50 are turned off, the FRP pipe manufacturing operation is completed.

The FRP pipe (polymer concrete pipe) manufactured as described above is manufactured by including skeletal muscles 88 in bulk mixed with glass fibers, polymers, silica sand, hardeners, fillers, etc., and thus, corrosion resistance and durability, and Tensile strength, compressive strength, etc. are shown to be large.

In addition, since the FRP tube is manufactured through the molding apparatus 2, the inner and outer surface state is smooth and is molded to a constant thickness and length, and at the same time, it has a breakthrough uniform dimension, thereby improving stability of the product. It is possible to maintain, because of this, the RF tube is manufactured with high quality with a minimum standard error, and the RF tube manufactured as described above can be repeatedly produced in large quantities.

On the other hand, when the production of the FRP pipe as described above, as shown in Figure 11a by reinforcing the reinforcing bar skeletal muscle 88 made in the form of the FRP pipe into the core 30, the coupling device 2 (Fig. If the operation mode is selected again from the menu panel (not shown) installed in the reference 2), the FRP pipe is manufactured while repeating the same process as described above.

As described above, in the present invention, the FRP tube is formed through the upper and lower molds 12 and 32 and the core 30, and the FRP tube is formed to have a uniform thickness and length while the inner and outer surfaces thereof are smooth. In addition, it is possible to maintain the stability of the uniformly innovative dimensions, minimizing the standard error, there is an effect that can be repeatedly produced in a large amount of high quality RF pipes.

Another effect is that the bulk of the glass fiber, the polymer, the silica sand, the hardener, and the filler is mixed with the skeletal muscles 88 in the molding apparatus 2, so that the FRP tube is made of corrosion resistance. It has excellent properties in terms of durability and also improves tensile strength and compressive strength together.

Claims (7)

With the base (4), A column 6 installed vertically at the rear of the base 4 and having a guide rail 8 at the front thereof; An upper mold 12 fixed to the upper end of the column 6 and having an external heater 16; Slider 26 is slip coupled to the guide rail (8), The core 30 is installed on the front of the slider 26, A lower mold 32 positioned below the core 30 and engaged with the upper mold 12 and having an external heater 16; A support cylinder 34 fixed to the base 4 while being installed on the bottom of the lower mold 32; A pump 82 connected to the support cylinder 34; In the molding apparatus 2 composed of a control unit 84 for connecting the pump 82 and the external heater 16, The hopper portion 14 is formed in the center of the upper mold 12, FRP pipe forming apparatus, characterized in that connected to the pump 82 while the pressure cylinder (22) having a pusher (18) is installed above the hopper portion (14). The method of claim 1, The pusher 62 is installed at the front of the slider 26, and is coupled to the core 30, and both ends of the rod 68 of the working cylinder 66 are coupled to both sides of the pusher 62, and the working cylinder 66 is coupled to the core 30. The FRP pipe forming apparatus, characterized in that connected to the pump 88 while being installed on both sides of the slider (26). The method of claim 1, The core 30, An upper core 36 having the other end fixed to the slider 26; A lower core 40 disposed separately from the upper core 36 and installed separately; Side cores 44 disposed on both sides of the upper and lower cores 36 and 40 and separately installed; It is disposed between the side core 44 and connected to the pump 82, the front end of the provided rod 54 is coupled to the side core 44, respectively, fixed to the upper core 36 by a bracket 57 A side cylinder 52; A lower cylinder (56) connected to the pump (82) while coupling the lower end of the rod (58) to the lower core (40) and fixed to the upper core (36) by a bracket (60). Alfi tube forming apparatus. The method of claim 3, wherein The upper core 36 is formed of a semi-circular upper plate mold 38, The lower core 40 is formed of a lower plate mold 42 of a semicircular shape, The side core 44 has a protrusion 46 sandwiched between the upper and lower plate molds 38 and 42 and a board contacting the inner surface of the upper and lower plate molds 38 and 42 while being integrally formed at the rear of the protrusion 46. FRP pipe forming apparatus, characterized in that 48). The method of claim 3, wherein The internal heater 50 is installed on each of the upper and lower cores 36 and 40, and the internal heater 50 is connected to the controller 84. Inserting the skeletal muscles 88 in the shape of an F-Al tube around the core 30 including the upper and lower cores 36 and 40 and the side cores 44 provided with the inner heater 50; Since the upper mold 12 having the hopper portion 14 formed thereon while having the external heater 6 thereon, the lower mold 32 provided with the external heater 6 is lifted up together with the core 30. Engaging step; Since the bulk is put into the hopper portion 14 to be injected into the upper and lower molds (12,32) while being molded in the shape of F-Al tube; After the bulk is injected into the upper and lower molds (12, 32) is heated by the internal and external heaters (16, 50) are heated, And then separating the lower mold 32 and the core 30 from the upper mold 12, After which the lower mold 32 is separated from the core 30, Afterwards the side core 44 and the lower core 40 to reverse the inner core 30 to be separated from the product, Afterwards, the pusher 62 advances the product so that the product is separated from the core 30 FRP pipe forming method, characterized in that consisting of. Inserting the skeletal muscles 88 in the shape of an F-Al tube around the core 30 including the upper and lower cores 36 and 40 and the side cores 44 provided with the inner heater 50; And then attaching the bulk to the skeletal muscle (88) to form an F-Al tube around the core (30); Since the lower mold 32 with the external heater 6 is raised thereafter to engage the upper mold 12 with the external heater 6 together with the core 30, the bulk is molded in the shape of an FAl tube. Making a; Allowing the subsequently attached bulk to be cured by internal and external heaters (16,50) heated inside the upper and lower molds (12,32); Then separating the lower mold (32) and the core (30) from the upper mold (12); After which the lower mold (32) is separated from the core (30); Afterwards the side core (44) and the lower core (40) to the inside of the core (30) to be separated from the product; After the pusher (62) to advance the product is separated from the core (30); FRP pipe forming method, characterized in that consisting of.

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