JPH0363946B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for manufacturing a tube, and in particular to a method and apparatus for manufacturing a tube, in particular a method for manufacturing a tube continuously by winding a filament of a thermosetting synthetic resin onto a mandrel and then heating and hardening the filament. The present invention relates to a method and apparatus for manufacturing a tube.

[Technical background of the invention and its problems]

Generally, a method of manufacturing a tube by winding a filament of thermosetting resin around the circumferential surface of a mandrel and heating and curing it is known. However, when using conventional tube manufacturing methods, it is difficult to control the winding angle at a constant level when winding the filament on the mandrel, and when pulling the thermoset tube product along the mandrel, the force in the direction of reducing the diameter is difficult to control. As a result, the frictional force between the tube and the mandrel increases, making it difficult to pull out the product tube.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and apparatus for manufacturing a tube that allows a filament made of synthetic resin to be easily wound around a mandrel at a constant winding angle, and also to be easily pulled out from the mandrel. Our goal is to provide the following.

[Summary of the invention]

In order to achieve the above object, the method for manufacturing a synthetic resin pipe according to the present invention includes attaching a plurality of core tapes made of heat-resistant soft resin along the axial direction on the entire circumferential surface of a mandrel. At least two filaments made of synthetic resin are wound in a twill pattern from above, and the tube is cured by passing through a heating furnace, and the cured synthetic resin tube is continuously pulled out. It is something to do.

Furthermore, the synthetic resin pipe manufacturing apparatus according to the present invention includes:
A mandrel fixedly held relative to a base frame, a core tape supply device that attaches a plurality of core tapes made of heat-resistant soft resin along the axial direction over the entire outer peripheral surface of the mandrel, and A winding device that continuously winds multiple filaments of synthetic resin in a twill pattern from above, a heating curing device that heats and hardens the pipe products wound with the filaments, and a winding device that continuously winds the filaments of synthetic resin from above in a twill pattern. The pipe is characterized by being equipped with a pipe pulling device for pulling out the pipe.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pipe manufacturing method and apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a base frame, and an upright frame 2 is erected at the left end of this base frame 1, and at its upper end is the base end of a mandrel 3 having a horizontal axis (left end in the figure). is carried. Between the base end and the free end of the mandrel 3, a core tape supply device 4, a filament winding device 5, and a heat curing device 6 are arranged at intervals along the axis of the mandrel. Further, a pipe drawing device 7 is arranged on the exit side of the heat curing device 6.

The core tape supply device 4 includes the mandrel 3
It has a fixed tube 8 disposed concentrically with the outer side thereof, and its rear end is fixedly supported by a bearing stand 9. A fixed disk 10 is fixed to the front end of the fixed tube 8. Four tape supply bobbins 11 are arranged on the front of the fixed disk 10 at equal intervals on the circumference, and each bobbin 11 is attached to a support stand 12.
The bobbin shaft 13 is rotatably held on the bobbin shaft 13. The core tape 14 fed out from each bobbin 11 is attached to the entire outer peripheral surface of the mandrel 3 by the action of the guide roller 15, as shown in FIG. The core tape 14 is made of a heat-resistant soft resin, such as polyimide-based Kapton tape (trade name) or fluorine-based Teflon tape (trade name). This type of core tape 14 is said to withstand the curing temperature in the heat curing process, easily adapt to the outer peripheral surface of the mandrel 3 and be attached to it, and has low frictional resistance when pulled out after tube forming. It has properties. Further, a core tape made of a heat-resistant soft resin reinforced with reinforcing fibers can also be used as required. Further, in this embodiment, the width of the core tape 14 is set to 1/4 of the circumference of the mandrel 3, so that when four tapes are arranged in parallel, a cylinder is formed without any gaps. It is becoming more and more like this. Note that the width of the core tapes 14 may be made a little wider so that the four core tapes 14 overlap to form a cylinder. Each of the guide rollers 15 is supported by bearings, and these bearings are held at the tips of support arms 16 extending from the outer circumference of the fixed disk 10.

On the other hand, on the outside of the fixed tube 8, an inner rotary tube 20 and an outer rotary tube 21 are mounted concentrically and rotatably in different directions. The inner rotary tube 20 is rotatably supported on a bearing pedestal 22, while the outer rotary tube 21 is rotatably supported on a bearing pedestal 23. These rotating tubes 2
As shown in FIG. 3, the rotation of the pulse motor M is driven in the opposite direction at a predetermined rotational speed via a reduction gear mechanism G.

Thus, an inner rotating disk 24 is fixed to the front end of the inner rotating tube 20, and an outer rotating disk 25 is similarly fixed to the front end of the outer rotating tube 21, and both are spaced apart from each other in the axial direction. ing.

On the front surface of the inner rotating disk 24, there are a plurality of bobbins 2 on which synthetic resin filaments 26 are wound.
7, 27, . . . , 27 are arranged at equal intervals on the circumference. As shown in FIG. 4, each of these bobbins 27 is placed on a support base 28 and is held rotatably about a bobbin shaft 29 that is orthogonal to the axis of the mandrel 3. Further, in order to provide drawing resistance to the filament 26, rotational resistance is applied to the bobbin shaft 29 by known means.

Therefore, on the outer periphery of the inner rotating disk 24,
As shown in FIG. 5, the base end of the sheave support rod 30 is rigidly connected, and a sheave support 31 is laterally spanned near the free end of the sheave support rod 30. A plurality of, for example, three sheaves 32, 32, 32 are rotatably supported on the shaft 31. Furthermore, a stem 33 that extends vertically downward is coupled to the tip of the sheave support rod 30. In this embodiment, four sheave support rods 30 are provided, and these four stems 33
A ring-shaped delivery eye 34 is coupled to the inner end of the ring. On the peripheral wall of this delivery eye 34, there are through holes 35, 3 whose number corresponds to the number of bobbins 27.
5,..., 35 are bored at equal intervals in the circumferential direction. Note that a filament guide 36 is fixed to the sheave support rod 3 at a position adjacent to the sheave support 31, and the filament 26 is attached to this guide 36.
A plurality of through holes 38 are bored through the filaments 26 to prevent the filaments 26 from becoming entangled with each other.

Similarly, on the front surface of the outer rotary disk 25, a plurality of bobbins 41, 41, . Each of these bobbins 41 is placed on a support base 42 and is held rotatably about a bobbin shaft 43. Further, the base end of a sheave support rod 44 is fixedly held on the outer periphery of the outer rotating disk 25, and a stem 45 extending vertically downward is coupled to the free end of the sheave support rod 44. A ring-shaped delivery eye 46 similar to the delivery eye 34 is coupled to the tip of each of these stems 45 . The synthetic resin filament 40 wound around the bobbin 41 is passed through the through hole of the filament guide and wound around a plurality of sheaves, similar to the inner filament shown in FIG. 46 through holes.

The heating curing device 6 is mounted on the base frame 1 and has a heating chamber 48 therein which is heated using thermal energy such as electromagnetic waves or high frequency waves. 49 is equipped. These compression roller rows 49 include three pairs of rollers, an upper roller 50 and a lower roller 51, arranged at intervals in the running direction. These rollers 50, 51 are configured to press-form the upper and lower halves of the forming tube.

On the other hand, the pipe drawing device 7 connects the formed pipes in the direction of the arrow and draws the formed pipe product from the tension mandrel 3. Pipe pulling device 7 that has such an effect
Various examples can be considered, but in this embodiment, an endless belt 54 is stretched around a driving wheel 52 and a driven wheel 53, and a large number of pipe grippers are installed at regular intervals on this endless belt 54. 5
It consists of 5. This tube gripper 55 has a pair of grip claws 5 as shown in FIG.
6, 57, and a compression spring 58 which is loaded between these and causes the claws to approach each other. The pipe drawing device 7 described above is not limited to the one shown in the drawings, but may also include a series of pinch rollers that are engaged with each other to send out the formed pipe to the downstream side.

Next, a method for manufacturing a synthetic resin pipe according to the present invention will be explained.

At the initial stage of manufacturing, the dummy tube 60 is first placed on the mandrel 3, the tip of the core tape 14 from the tape supply bobbin 11 is connected to the tube end of the dummy tube 60, and the pipe drawing device 7 is driven to pull the dummy tube 60 out of the way. Pull it out in the viewing direction. Then, while the core tape 14 is being fed out, the prepreg-treated composite fiber filaments 26 and 40 are continuously wound on the core tape 14 in a twill weave. In this winding operation, the composite fiber filaments may be pulled out from the bobbin 27 and the bobbin 41 while rotating the inner rotating disk 24 and the outer rotating disk 25 in opposite directions. The formed tube thus obtained by winding the composite fiber filament around the core tape 14 is led to the heating hardening device 6, where it is compressed and hardened as it passes through the compression roller row 49. In this way, after the dummy tube has passed, a synthetic resin tube is automatically manufactured. Incidentally, the formed tube can be cut to a predetermined length using a cutting saw.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the composite fiber filament wound around the bobbin is wound around the sheave and then passed through the delivery eye and wound onto the core tape on the mandrel in a twill pattern. , the composite fiber filament can be wound at a constant winding angle. Further, since the heat-resistant soft resin core tape is disposed on the mandrel along the axial direction, the formed tube can be pulled out without applying a large frictional force to the mandrel.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing the tube manufacturing apparatus according to the present invention, Fig. 2 is an explanatory drawing showing the feeding situation of the core tape, Fig. 3 is an explanatory drawing showing the drive mechanism of the rotary tube, and Fig. 4 is an explanatory drawing showing the driving mechanism of the rotary tube. The figure is a side view showing the bobbin holding mechanism, Figure 5 is a perspective view showing the path for leading out the filament of composite fiber from the bobbin, and Figure 6 is a perspective view showing the delivery eye that supplies the filament. 7 is a perspective view showing a forming tube drawing device, and FIG. 8 is a front sectional view showing a forming tube grip mechanism. 1... Base frame, 3... Mandrel, 4
... Core tape supply device, 5 ... Filament winding device, 6 ... Heat curing device, 7 ...
Pipe drawing device, 11... tape supply bobbin,
15... Guide roller, 20... Inner rotating tube, 21... Outer rotating tube, 27, 41...
Bobbin, 26,40...Filament, 34,4
6...Delivery eye.

Claims (1)

[Claims] 1. A plurality of core tapes made of heat-resistant soft resin are attached without gaps along the axial direction on the circumferential surface of the mandrel, and at least two core tapes made of synthetic resin are attached from above the core tape. A method for manufacturing a composite pipe, characterized by winding filament into a twill weave, passing it through a heating furnace to harden it, and continuously drawing out the hardened pipe product. 2. A mandrel fixedly held relative to a base frame, a core tape supply device that attaches a plurality of core tapes made of heat-resistant soft resin along the axial direction on the outer peripheral surface of the mandrel, and A winding device for continuously winding at least two filaments of synthetic resin in a twill pattern; a heating curing device for heating and curing the wound pipe products; and a pipe for continuously pulling out the pipe products from a mandrel. A pipe manufacturing device comprising a drawing device. 3. The core tape supply device includes a fixed disk, and a plurality of bobbins arranged on the fixed disk at equal intervals in the circumferential direction and rotatable around a bobbin axis perpendicular to the axis of the mandrel. The pipe manufacturing apparatus according to claim 2, characterized in that: 4 The above filament winding device is
At least two rotating disks rotatable in different directions and arranged concentrically, and a plurality of filament bobbins attached to the front surfaces of these rotating disks and rotatable around bobbin axes perpendicular to the axis of the mandrel. , a horizontal support arm that is cantilever-supported by the rotating disk and extends substantially parallel to the axis of the mandrel, and a vertical support arm that extends radially inward from the tip of the horizontal support arm; 3. The tube manufacturing apparatus according to claim 2, further comprising a delivery eye coupled to an inner end of the vertical support arm.