JP3292771B2 - Method and apparatus for manufacturing fiber-reinforced plastic curved tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a fiber reinforced plastic curved tube having a curved axial center.

[0002]

2. Description of the Related Art Glass fiber reinforced plastic pipes in which resin mortar is reinforced with glass fibers have excellent strength characteristics and are widely used as sewage pipes and the like. A straight glass fiber reinforced plastic tube having a straight axis is usually formed by winding a continuous glass fiber impregnated with a resin spirally around a mandrel extending linearly together with a resin mortar layer. It is manufactured continuously by the filament winding method.

When manufacturing a curved tube having a curved axis from a glass fiber reinforced plastic tube manufactured by such a filament winding method, the tube is cut into a predetermined length and the outer peripheral surface of the straight tube is cut. Must be held and curved in an uncured state. For this reason, irregularities or the like are likely to be generated on the outer peripheral surface of the manufactured curved tube, which may result in poor appearance.

Further, Japanese Patent Publication No. 59-33091 discloses that a molding material is laminated on the outer peripheral surface of an elastic cylinder in which a linear rigid shaft is inserted and formed into a tubular shape. A method is disclosed in which a straight shaft is extracted from an elastic cylinder before the resin is completely cured, and the molding material is cured together with the elastic cylinder by curving. The elastic cylinder is withdrawn from the cured tube.

[0005]

When a curved tube made of glass fiber reinforced plastic is produced by such a method for producing a curved tube, a molding material is laminated on the outer peripheral surface of the elastic cylindrical body, and a predetermined material is laminated. One glass fiber reinforced plastic tube of length
Since it is formed one by one, it cannot be manufactured continuously as in the filament winding method, and the production efficiency is very poor. In addition, since the molding material is manufactured by laminating each tube, there is a problem that the wall thickness is different for each manufactured tube, and the quality is not constant.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a fiber reinforced plastic curved tube capable of continuously producing a curved tube having a constant thickness, and a method thereof. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of manufacturing a curved fiber reinforced plastic tube, comprising laminating a fiber reinforced plastic material on a linearly extending molding mandrel to form a straight tubular fiber reinforced plastic tube. The step of propelling the mandrel in an uncured state, and the rigid shaft is detachably inserted through the shaft of the flexible cylinder, and the tip of the molding mandrel
A step of supporting the uncured fiber-reinforced plastic tube propelled from the molding mandrel from the inside by means of a tube support concentrically mounted on the tube and cutting it to a predetermined length; Remove the tube support that supports the cured fiber reinforced plastic tube from the molding mandrel,
A step of pulling out the rigid shaft from the tube support, a step of bending the flexible tubular body inside the uncured fiber-reinforced plastic pipe to bend the fiber-reinforced plastic pipe, and a step of bending the fiber-reinforced plastic pipe And a step of removing the flexible cylinder from the cured fiber-reinforced plastic tube, thereby achieving the above object.

Further, the apparatus for manufacturing a curved fiber reinforced plastic tube according to the present invention is characterized in that a fiber reinforced plastic material is laminated on a molding mandrel extending linearly to form a fiber reinforced plastic tube in a straight pipe state, and the molding mandrel is formed. A continuous molding device for propelling the upper portion in an uncured state, and a rigid shaft body is removably inserted into the shaft center portion of the flexible cylinder, and is concentrically inserted into a tip end of a molding mandrel of the continuous molding device. A pipe support for detachably supporting an uncured fiber reinforced plastic pipe propelled from a molding mandrel, and an uncured fiber reinforced plastic pipe supported by the pipe support for a predetermined length And a cutting machine for cutting the above, whereby the above object is achieved.

[0009]

According to the method of manufacturing a bent fiber reinforced plastic pipe of the present invention, the uncured fiber reinforced plastic pipe formed into a straight pipe and propelled on a forming mandrel is supported by a pipe support. Disconnected in the state. With the cut fiber-reinforced plastic tube supported by the tube support, the rigid shaft disposed at the axis of the tube support is pulled out of the flexible tube. As a result, the uncured straight fiber-reinforced plastic tube is supported by the flexible tubular body, and the fiber-reinforced plastic tube is bent by bending the flexible tubular body. The cured fiber reinforced plastic tube is cured to produce a fiber reinforced plastic curved tube.

In the apparatus for manufacturing a fiber reinforced plastic pipe according to the present invention, when an uncured fiber reinforced plastic pipe in a straight pipe state is propelled from a molding mandrel by a continuous molding apparatus, it is concentric with the molding mandrel. The uncured fiber reinforced plastic pipe is supported from the inside by the pipe support attached in the above. When the tube support supports the uncured fiber reinforced plastic tube over a predetermined length, the cutting machine cuts the uncured fiber reinforced plastic tube and removes the tube support from the molding mandrel. Then, the rigid shaft inserted through the shaft center of the tube support is pulled out of the flexible tube, and the fiber-reinforced plastic tube is supported by the flexible tube. In such a state, the flexible tubular body is curved and the uncured fiber reinforced plastic tube is cured. The flexible tube is removed from the cured fiber reinforced plastic tube.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view of an apparatus for manufacturing a curved tube made of glass fiber reinforced plastic which is an example of the present invention, and FIG. 2 is a front view of the apparatus.

The apparatus for manufacturing a glass fiber reinforced plastic curved tube shown in FIGS. 1 and 2 is a continuous molding machine 20 for continuously manufacturing a straight glass fiber reinforced plastic tube 10 having a straight axis. And a cutting machine 30 for cutting the glass fiber reinforced plastic tube 10 manufactured by the continuous molding machine 20 into a predetermined length, and taking out the glass fiber reinforced plastic tube 10 of a predetermined length cut by the cutting machine 30. And a pipe take-out machine 40.

The continuous molding machine 20 has a hollow molding mandrel 22 horizontally supported in a cantilever manner on a support 21. A band-shaped paper 23 is spirally wound around one end of the forming mandrel 22 so that the forming mandrel 2
2, a paper tube 24 is formed. Molding mandrel 22
The paper tube 24 formed on the outer peripheral surface is provided with a rotational force by a belt type propulsion device 25, and is propelled spirally. The propulsion device 25 wraps a belt that moves around the paper tube 24 , and applies a rotational force to the paper tube 24 with the belt to helically propell the paper tube 24.

A strip-shaped release film 11 is sequentially wound around the outer peripheral surface of a paper tube 24 formed on a forming mandrel 22 and spirally fed, and covers the paper tube 24. A glass roving 12 as a reinforcing material is wound around the outer peripheral surface of the release film 11. On the outer peripheral surface of the glass roving 12 wound around the release film 11, a resin mortar supplied from a supply unit 26 disposed above the glass roving 12 is laminated. The glass roving 13 is wound around the resin mortar layer formed on the glass roving 12, and the release film 14 is wound around the glass roving 13.

In this manner, the glass fiber reinforced plastic tube 10 is continuously formed on the paper tube 24 formed on the forming mandrel 22. The molded glass fiber reinforced plastic tube 10 is in an uncured state because it is not cured in a curing furnace.

FIG. 3 is a sectional view of the leading end of the forming mandrel 22 where the paper tube 24 is spirally fed. As shown in FIG. 3, the end face of the tip of the hollow forming mandrel 22 is open, and a receiving member 27 is fitted in the tip. A tapered recess 2 is provided at the axis of the receiving member 27.
7a are formed. The concave portion 27a is open in the open end surface of the molding mandrel 22, and the inner diameter gradually decreases as the distance from the opening increases. Holder 27
In the concave portion 27a, the distal end portion of the tube support 49 which is linear in the tube take-out device 40 is supported. The tube support 49 is provided to support the helically propelled fiber reinforced plastic tube 10 manufactured together with the paper tube 24 on the forming mandrel 22 and the receiving member 27.
Supports the distal end portion of the linear tube support 49 and arranges the tube support 49 concentrically with the forming mandrel 22.

The tube support 49, the distal end of which is supported by the receiving member 27 , excludes a cylindrical rigid shaft 49a which passes through the axial center in a straight line, and each end of the rigid shaft 49a. Flexible tubular body 49b having flexibility, such as rubber, fitted at the center
And The rigid shaft body 49a is slightly longer than the axial length of the glass fiber reinforced plastic tube 10 manufactured to a predetermined length. The rigid shaft body 49a is adapted to be extracted from the inside of the flexible tubular body 49b. The flexible cylindrical body 49b is formed in a tapered shape in which the outer peripheral surface of the distal end portion on the forming mandrel 22 side gradually decreases in outer diameter toward the distal end side.

At the tip of the rigid shaft 49a, the joining member 4
9c is fitted. The tip of the fitting member 49c is
The rigid shaft 49a protrudes from the distal end, and the outer peripheral surface of the distal end is tapered so as to be in close contact with the tapered recess 27a of the receiving member 27 disposed in the forming mandrel 22. A cylindrical connecting member 49d is fitted to the base end of the rigid shaft 49a, and the connecting member 49d is in a state of extending from the base end of the rigid shaft 49a.

As shown in FIG. 2, the connecting member 49d at the base end of the tube supporting member 49 is in a horizontal state and cantilevered by the movable bracket 41 of the take-out device 40, and the joining member 49c is Receiving tool 27 for molding mandrel 22
By being fitted in the molding mandrel 22
And become coaxial.

A cutting device 30 for cutting the fiber reinforced plastic tube 10 formed on the forming mandrel 22 and supported by the tube support 49 is disposed near the tip of the forming mandrel 22. This cutting device 30 is shown in FIG.
As shown in FIG. 5, a base 31 disposed on the side of the forming mandrel 22, a pair of guide rails 36 disposed on the base 31 in parallel with the forming mandrel 22, and moving along each guide rail 36. And a pair of guide rails 32 arranged on the substrate 37 so as to be orthogonal to the forming mandrel 22.
, And two motors 34 and 35 mounted on the support 33.

One of the motors 34 is a molding mandrel 2
2, and is moved in a direction in which the support base 33 comes into contact with or separates from the mandrel 22 by the driving thereof. The other motor 35 is arranged at a position close to the molding mandrel 22, and has an output shaft parallel to the molding mandrel 22. And the rotary blade 38 is attached to the output shaft.

When the fiber-reinforced plastic tube 10 formed on the forming mandrel 22 is supported on the tube support 49 over a predetermined length, the motor 34 is turned on.
As a result, the entire mounting base 33 is brought closer to the glass fiber reinforced plastic tube 10, and as shown in FIG.
The glass fiber reinforced plastic tube 10 is cut together with the paper tube 24 by a rotary blade 38 rotated by a motor 35 so as to face the tapered distal end of the flexible cylindrical body 49 b in the tube support 49. . From each end of the cut glass fiber reinforced plastic tube 10 and the paper tube 24, each end of the flexible tubular body 49b of the tube support 49 is extended. Sex cylinder 49b
Each end of the rigid shaft body 49a extends from each end of the rigid shaft body 49a.

The substrate 37 moves along a guide rail 36 parallel to the forming mandrel 22, so that the cutting position of the glass fiber reinforced plastic tube 10 by the rotary blade 38 can be changed. It has become.

Tube take-out machine 40 having tube support 49
As shown in FIG. 2, the connecting member 49 of the tube support 49 is
It has a movable bracket 41 that detachably supports d. The movable bracket 41 is hung over a tube support 49 so as to be screwed into a screw shaft 42 laid parallel to the frame 43. The screw shaft 42 is rotated forward and reverse by a motor 44 disposed on a frame 43, and the movable bracket 41 screwed to the screw shaft 42 is moved along the screw shaft 42. The movable bracket 41 is configured such that a connecting member 49d provided at a base end portion of the tube support 49 is detachably engaged.

Below the screw shaft 42, there is provided an elevating table 45 which is in a horizontal state. The lift 45 is raised and lowered in a horizontal state, and a pair of guide rails 46 extending at right angles to the screw shaft 42 is provided on the upper surface thereof. The lift 45 moves up when the movable bracket 41 moves away from the molding mandrel 22 and the tube support 49 is positioned above the lift 45, and each end of the glass fiber reinforced plastic tube 10 cut. Each end of the flexible tubular body 49b in the tubular support 49 extending from the portion is supported on each guide rail 46, respectively. In such a state, the connecting member 49d of the tube support 49
The engagement state between the and the movable bracket 41 is released. The uncured glass fiber reinforced plastic tube 10 supported by the tube support 49 is placed between the guide rails 46 and the lift 4.
5 is arranged at an appropriate distance from the upper surface.

On one side of the lift 45, a lift 45
A pair of carry-in rails 47 extending along the upper guide rail 46 are arranged. Each end of the flexible tubular body 49b of the tube support 49 is placed on the carry-in rail 47 and is carried onto the guide rail 46 of the lift 45.

On the other side of the lift 45, a lift 45
A pair of unloading rails 48 extending along the upper guide rail 46 is arranged. The unloading rail 48 moves the lift 4 in a state where the engagement with the movable bracket 41 is released.
Each end of the flexible tubular body 49b of the tubular support 49 mounted on the guide rail 46 on the upper part 5 is transferred and carried out.

The tube support 49 carried out by the carry-out rail 48 is carried to a worktable 50 for bending. In this worktable 50, the tube support 4
Uncured fiber reinforced plastic tube 10 supported on
The rigid shaft 49a of the tube support 49 is removed from
The glass fiber reinforced plastic tube 10 supported by the flexible cylinder 49b is bent.

On the side of the worktable 50, a curing furnace 60 for curing the uncured fiber-reinforced plastic tube 10 that has been bent is provided.

The operation of the apparatus for manufacturing a curved glass fiber reinforced plastic tube having such a configuration is as follows. When the belt-shaped paper 23 is spirally wound around the forming mandrel 22 to form the paper tube 24, the belt of the propulsion device 25 is wound around the paper tube 24. When the propulsion device 25 is driven, the belt moves around and the paper tube 24 is rotated. Thereby, the paper tube 24 is helically propelled on the forming mandrel 22.

At this time, the connecting member 49d of the pipe support 49 is attached to the movable bracket 41 of the pipe take-out machine 40, and is horizontal in a cantilever state. Then, the joining member 49c is inserted into the concave portion 27a of the receiving member 27 provided in the distal end portion of the molding mandrel 22.

Paper tube 2 formed on forming mandrel 22
4, a release film 11 and a glass roving 1
2 are wound in turn, and the feeder 26
Mortar supplied from is laminated. Thereafter, the glass roving 13 and the release film 14 are sequentially wound on the resin mortar layer. In this manner, when the glass fiber reinforced plastic tube 10 is manufactured on the paper tube 24, the glass fiber reinforced plastic tube 10 is sequentially wound together with the paper tube 24 by the spirally fed paper tube 24 as shown in FIG. Is moved onto the flexible tubular body 49b of the tubular support 49.

Then, the glass fiber reinforced plastic tube 1
0 is supported by the tube support 49 over a predetermined length, the cutting machine 30 is driven to rotate the rotating blade 38 into the glass fiber reinforced plastic tube 10.
, The glass fiber reinforced plastic tube 10 is cut together with the paper tube 24.

When the glass fiber reinforced plastic tube 10 and the paper tube 24 are cut to a predetermined length, the tube removing machine 4
0 motor 44 is driven to rotate the screw shaft 42,
The movable bracket 41 moves in a direction away from the forming mandrel 22. As a result, the tube support 49 partially supported by the movable bracket 41 moves horizontally in a direction away from the forming mandrel 22 and is positioned above the elevating table 45.

In such a state, the lift 45 is raised, and each end of the tube support 49 extending from each end of the glass fiber reinforced plastic tube 10 is connected to each guide on the lift 45. Being supported by the rail 46,
The connecting member 49d of the tube support 49 is movable bracket 41
Removed from Since the tube support 49 is supported on each guide rail 46, the glass fiber reinforced plastic tube 10 is positioned between the guide rails 46 with a slight gap from the upper surface of the elevating platform 45. I have.

Thereafter, the tube support 49 for supporting the glass fiber reinforced plastic tube 10 rolls on the carry-out rail 48 and is transferred onto the work table 50.

At this time, a new tube support 49 is rolled on the carry-in rail 47 and carried in on the elevating table 45, and the elevating table 45 is lowered, thereby connecting the connecting member 49d.
Are supported by the movable bracket 41 in a cantilever state.
Then, by driving the motor 44, the movable bracket 41 is moved so as to approach the forming mandrel 22, and the joining member 49 c of the tube support 49 is inserted into the receiving member 27 in the tip end of the forming mandrel 22. A body support 49 is horizontally disposed concentrically with the forming mandrel 22.

The tube support 49 transferred onto the worktable 50
In the glass fiber reinforced plastic tube 10, the rigid shaft 49a of the tube support 49 is pulled out from the flexible tube 49b, and only the flexible tube 49b remains in the glass fiber reinforced plastic tube 10. State. In such a state, a bending force is applied to each end of the flexible tubular body 49b extending from each end of the glass fiber reinforced plastic tube 10, and the glass fiber reinforced plastic tube 10 is bent at a predetermined bending angle. It is curved to become. Then, the curved glass fiber reinforced plastic tube 10 is carried into the curing furnace 60 and is cured by being heated.

The cured glass fiber reinforced plastic tube 10 is carried out of the curing furnace 60, and the inside flexible tube 49b and the paper tube 24 are removed. Thus, a bent glass fiber reinforced plastic tube having a predetermined bending angle is obtained.

The glass fiber reinforced plastic tube 10 in a straight pipe state is continuously formed by the continuous forming machine 20 even during the bending on the work table 50 and the curing in the curing furnace 60. Then, the glass fiber reinforced plastic pipe 10 is supported by a new pipe support 49 joined to the tip of the molding mandrel 22, cut into a predetermined length by the cutting machine 30, and taken out by the pipe taking out machine 40. Are sequentially transferred on the worktable 50 together with the tube support 49. Then, as described above, the uncured glass fiber reinforced plastic tube 10 is sequentially bent on the work table 50.

Therefore, since the glass fiber reinforced plastic tube 10 having a certain thickness is continuously manufactured by the continuous molding machine 20, the glass fiber reinforced plastic curved tube having a certain thickness can be continuously formed. Manufactured. In addition, the glass fiber reinforced plastic tube 10 is cut while being supported from the inside by the tube support 49, and is bent while being supported by the flexible tubular body 49b of the tube support 49. Since each end of the tube support 49 is also supported during the movement, there is no possibility that the outer peripheral surface of the manufactured glass fiber reinforced plastic curved tube is scratched or uneven.

[0043]

According to the method and apparatus for manufacturing a fiber reinforced plastic tube of the present invention, the uncured, uncured fiber reinforced plastic tube in a continuously formed straight state is supported from the inside by the tube support. In this state, the sheet is cut and bent, so that the production efficiency is significantly improved. Moreover, since the uncured fiber reinforced plastic tube is supported from the inside, there is no possibility of damaging the outer peripheral surface.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an apparatus used for carrying out a method for producing a fiber-reinforced plastic tube of the present invention.

FIG. 2 is a schematic front view of the device.

FIG. 3 is a longitudinal sectional view of a forming mandrel and a tube support used in the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Glass fiber reinforced plastic tube 20 Continuous molding machine 22 Molding mandrel 24 Paper tube 25 Propulsion machine 26 Feeder 30 Cutting machine 38 Rotating blade 40 Pipe takeout machine 49 Pipe support 49a Rigid shaft 49b Flexible cylinder 50 Work bench 60 Curing furnace

Claims (2)

(57) [Claims] A step of laminating a fiber-reinforced plastic material on a linearly extending molding mandrel to form a straight tubular fiber-reinforced plastic tube, and propelling the molding mandrel in an uncured state; A rigid shaft body is detachably inserted through the shaft center of the body, and concentric with the tip of the molding mandrel
A step of supporting the uncured fiber-reinforced plastic tube propelled from the molding mandrel from the inside by the tube support attached to the inside and cutting it to a predetermined length; and a step of cutting the uncured fiber cut to a predetermined length. Removing the tube support for supporting the reinforced plastic tube from the molding mandrel , extracting the rigid shaft from the tube support, and removing the flexible cylinder inside the uncured fiber reinforced plastic tube. A fiber reinforced plastic comprising: bending to bend the fiber reinforced plastic tube; curing the curved fiber reinforced plastic tube; and removing the flexible cylinder from the cured fiber reinforced plastic tube. Method of manufacturing curved pipes. 2. A continuous molding device for laminating a fiber-reinforced plastic material on a linearly extending molding mandrel to form a fiber-reinforced plastic tube in a straight tube state, and propelling the molding mandrel in an uncured state. A rigid shaft body is removably inserted through the shaft center portion of the flexible cylindrical body, and is attached and detached concentrically to the tip end of the molding mandrel of the continuous molding apparatus, and is an uncured material that is propelled from the molding mandrel. A fiber reinforced plastic comprising: a tube support for supporting a fiber reinforced plastic tube from the inside; and a cutting machine for cutting an uncured fiber reinforced plastic tube supported over a predetermined length by the tube support. Curved tube manufacturing equipment.