JPS6155462B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous manufacturing method for reinforced resin deformed tubes and an apparatus for manufacturing the same. Here, the reinforced resin pipe includes a fibrous material,
This is a reinforced resin pipe, and an irregularly shaped pipe is a pipe whose cross section is non-circular, for example square or oval.

Methods and apparatus for continuously manufacturing reinforced resin tubes are known. A known method includes, for example, winding an endless belt spirally at least once around a core rod fixed in a cantilevered manner, sandwiching a long strip between the endless belt and the core rod, and
An endless belt is rotated to wind a strip around a core rod to form a helical tube that progresses in a spiral, and a fiber material and a curable resin are supplied onto the helical tube to form the tube. While the tube spirals along the core rod, heat is applied from the surrounding area to harden the resin.
This is the method of obtaining a reinforced resin pipe. In this method, the tube is formed on a helical tube, and the helical tube must progress while rotating in a spiral around a fixed core rod, so the shape of the tube is cylindrical, i.e., a tube. The cross section of must be circular. In other words, with this method,
It was not possible to manufacture irregularly shaped tubes. Therefore,
The inventor attempted to manufacture a deformed tube by improving the above method.

In the above-mentioned known method, the inventor divided the core rod into two in the middle in the longitudinal direction, left the core rod with a circular cross section on the side where the endless belt is wound, and fixed it in the conventional manner. However, on the tip end side of the core rod, an attempt was made to make the outer periphery of the core rod non-circular so that the outer periphery of the core rod could be rotated around its axis. In this way, the cylindrical shape formed on the fixed side of the core rod is gradually deformed into a non-circular shape at the tip of the core rod, and as the tube progresses in a spiral, the tip of the core rod is shaped in the circumferential direction. The tube was rotated to allow it to maintain its deformed shape. and,
The tube was heated from the outside in its irregular shape to harden the curable resin. In this way, it was confirmed that irregularly shaped tubes could be manufactured continuously. The method of this invention was made based on such confirmation.

This invention involves winding a strip around a core rod fixed in a cantilevered manner, constructing a helical tube that progresses in a spiral with the strip, and supplying a fiber material and a curable resin onto the helical tube. In this method, the outer peripheral surface of the distal end of the core rod is rotatable around the core rod, and the cross section of the outer peripheral surface of the distal end of the rotating part is An uncured tube formed into a cylindrical shape on the fixed side of the core rod is gradually changed into an irregular shape on the outer peripheral surface of the rotating part, and the resin is cured in the irregular shape. This invention relates to a continuous manufacturing method for pipes.

An example of implementation of the method of this invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the method of the present invention in a partially cutaway view together with an apparatus. FIG. 2 shows another embodiment of the method of the invention, with a part cut away, together with the apparatus. FIGS. 3 and 4 are enlarged views of the cross-sections taken along the -- line and -- line in FIG. 2, respectively.

In Fig. 1, 1 is a stand, 2 is a fixed core rod, 3 is a long strip, 4 is an endless belt,
5 and 6 are rolls, 7 is a spiral tube, 8 is a glass fiber roving containing hardening resin, 9 is a roll, 1
0 is a resin mortar, 11 is an intermediate layer of resin mortar, 12 is a glass fiber roving containing a hardening resin, 13 is a rotating part of a core rod, 14 is a deformed pipe,
15 is a heating tool.

In the example shown in FIG. 1, each numbered part has the following relationship. The core rod 2 is fixed on the base 1 in a cantilevered manner and cannot rotate. A rotating portion 13 is attached to the tip of the core rod 2, and the portion 13 can rotate around the axis of the core rod 2.
An endless belt 4 is wound helically around the core rod 2 at least once, is supported by rolls 5 and 6, and is moved in the direction of arrow X. A strip 3 is sandwiched between the endless belt 4 and the core rod 2, and is spirally wound around the core rod 2 as the endless belt 4 moves to form a spiral tube 7. spiral tube 7
is moved in the direction of arrow X and moves spirally around the core rod 2.

In the example shown in Fig. 1, at the tip of the fixed core rod 2,
A rotating part 13 is attached in contact with this. The rotating portion 13 is coupled to the fixed portion 2 through one axis so as to be rotatable. The rotating portion 13 constitutes an extension surface of the fixed portion 2, and the contact portions thereof have the same cross-sectional shape. However, the tip of the rotating portion 13 has a rectangular cross section. Rotating part 1
In the middle of 3, the cross section changes from circular to rectangular, drawing a gently curved surface. The outer periphery of this circle and the outer periphery of the rectangle are substantially of equal length.

In the example shown in FIG. 1, a reinforced resin deformed tube is made in the following manner. For example, a tape made of release paper is used as the strip 3, and this is attached to the endless belt 4.
and the cylindrical rod 2, the endless belt 4 is driven to continuously form a spiral tube 7, and the spiral tube 7 is made to advance spirally around the cylindrical rod 2. Next, a glass fiber roving 8 impregnated with a curable resin is wound around the surface of the spiral tube 7. In this way, an inner layer tube made of reinforced resin is formed on the spiral tube 7. in addition,
Apply resin mortar 10. During coating, the roll 9 is used to face the inner layer tube and rotated in opposite directions to deposit the resin mortar 10 to a constant thickness on the inner layer tube, thus forming the intermediate layer 11. On the intermediate layer 11,
Furthermore, a curable resin-impregnated glass fiber roving 12 is wound to form an outer layer tube. These layers are formed within the area where the fixed core rod 2 exists, and a composite resin tube containing fibers is formed here.

The resin tube formed as described above is conveyed onto the rotating part 13 of the mandrel while the resin has not yet hardened. The resin tube conveyed onto the rotating part 13 changes according to the curved surface on the rotating part 13, and its cross section gradually changes from a cylindrical shape to a rectangular cylindrical shape. The resin tube itself progresses in a spiral, so after deforming into a rectangular tube shape,
While rotating the rotating part 13, it slides on the rotating part 13 toward the tip. In this way, the resin tube 14 formed into a rectangular tube shape enters the heating tool 15, where it is heated to hasten the hardening of the resin, thereby creating a reinforced resin deformed tube. Thereafter, if a release paper is used as the strip 3, the release paper is removed from the irregularly shaped tube.

In order to improve the sliding between the core rod 2 and rotating portion 13 and the helical tube 7, steel balls may be inserted onto the surfaces of the core rod 2 and rotating portion 13. That is, a steel ball is attached so that the tip of the steel ball slightly protrudes from the above-mentioned surface, and the spiral tube 7 comes into contact with this steel ball and moves on the above-mentioned surface while rotating the steel ball. It is desirable to do so.

The rotating part 13 does not need to be rotated externally when it rotates easily without requiring great force. In other words, it can also be rotated naturally as the resin tube advances. However, when a large force is required to rotate the rotating portion 13, the rotating portion 13 is forcibly rotated. When forcibly rotating, care must be taken to ensure that the rotational speed matches the speed of the helical movement of the resin tube.

The present invention also includes an apparatus for manufacturing a reinforced resin deformed tube. The device consists of a core rod 2 as shown in FIG.
is fixed in a cantilevered manner, an endless belt 4 is provided that rotates around the fixed side portion of the core rod 2, and the endless belt 4 is wound spirally on the outer peripheral surface of the core rod 2, and the endless belt 4 and the core rod are There is a strip 3 between
A device for producing a reinforced resin pipe, which is arranged to sandwich and wind a spiral tube to form a spiral tube 7 that progresses spirally along a core rod, and to supply a fiber material and a curable resin around the spiral tube 7. , the tip side of the core rod 2 is rotatable around the axis of the core rod 2, the cross-sectional shape of the rotating portion 13 is made non-circular toward the tip, and the length around the non-circle is the core at the endless belt winding position. The circumference of the rod 2 is equally spaced, and a heating device is provided on the tip side of the rotating portion 13.

In the device according to the invention shown in FIG. 1, the rotating part 13 constitutes an extension of the fixed part 2 of the core and constitutes a continuous surface. By the way, in the device of the present invention, the rotating portion 13 may not constitute a continuous surface, but may be divided into several small surfaces. FIG. 2 shows such an example. The device of FIG. 2 can be otherwise identical to that of FIG. 1, with the only difference being the rotating part 13. In FIG. 2, other parts are cut away or omitted to show the structure of the rotating part 13 in detail.

In FIG. 2, the rotating part 13 is constructed as described below. The shaft 16 is fixed to the tip of the core rod 2 and cannot rotate. Rings 17 are fitted in some places on the shaft 16, and the rings 17 and the shaft 1
A small ball 18 is inserted between the ring 17 and the ring 16 so that the ring 17 can rotate in the circumferential direction on the shaft 16. A support 19 is provided protruding from the ring 17, and a bearing 20 is attached to the support 19, and a roll 21 or 22 is rotatably attached to the support 19 by the bearing 20.

The set of rolls 21 located near the core rod 2 is
As shown in FIG. 3, lines connecting the outer contours in the cross section are arranged to form a roughly circular shape, and the length of the lines is roughly equal to the outer circumference of the core rod 2. However, as shown in FIG. 4, the set of rolls 21 located away from the core rod 2 are arranged so as to have irregular cross-sections. For example, they are arranged so that their cross sections are triangular. For this reason, particularly small rolls 22 are attached to the corners of the triangle. A line connecting the outer circumferences of these rolls 21 and 22 is equal to the outer circumference of the arrow tension core rod 2. Roll 2 in intermediate position on shaft 16
In the first set, the cross-sectional shape is gradually changed as the distance from the core rod 2 increases, and the cross-sectional shape gradually approaches the irregular shape.

The rotating part 13 in FIG. 2 operates as follows. The fiber material-containing tube made on the core rod 2 is conveyed in an uncured state onto the rotating part 13 and passes over the rotating part 13 while progressing in a spiral manner. During this time, the cross-sectional shape of the tube is successively changed by a set of rolls 21 or 22, resulting in a deformed tube. At this time, the resin is in an uncured state, and the length of the curve connecting the outer peripheries of the rolls 21 or 22 is approximately equal to the circumference of the core rod 2, so it is easy to transform the tube into a deformed tube. . Further, although the tube moves in a helical manner, since the set of rolls 21 or 22 can be freely rotated in the circumferential direction by the small balls 18, the deformed state can be maintained as it is, and the rolls 21 or 22 themselves can be rotated in the circumferential direction. The rotation of the tube facilitates axial movement of the tube. In this way, the rotating part 13
Above, a circular tube can be easily changed to a deformed tube. After such deformation is performed, the resin is cured in this state to obtain a deformed tube.

The device according to the invention can be summarized as follows. That is, in this device, a core rod is fixed in a cantilevered manner, a strip is spirally wound around the core rod, a spiral tube is formed which progresses in a spiral along the core rod, and a strip material is wound around the core rod in a spiral manner. In an apparatus for manufacturing a reinforced resin pipe that supplies a fiber material and a curable resin, the tip side of a core rod is rotatable around the axis of the core rod, and the cross-sectional shape of the rotating part is made non-circular toward the tip. This is a continuous device of reinforced resin deformed tubes, in which the length of the non-circular shape is made substantially equal to the circumference of the stationary side portion of the core rod, and a heating device is provided on the tip side of the rotating portion.

Next, further details regarding the method and apparatus of the present invention will be sequentially explained.

As described above, a tape made of release paper can be used as the strip 3 constituting the spiral tube 7, but an endless steel belt can also be used instead. When using an endless steel belt to form a spiral tube, the belt is forcibly moved by a drive roll not shown in the drawings.
The belt that has advanced to the tip of the core rod 2 or the tip of the rotating part 13 is passed through the rotating part 13 and the core rod 2, returned to the table 1 side, and is wound around the core rod 2 again. Such devices are already known.
This known device can be modified and used as the device of the present invention.

FIG. 1 shows a case where an intermediate layer made of resin mortar is provided between glass fiber-containing resin layers to produce a three-layer composite pipe. However, the method and apparatus of the invention can also be used to produce tubes consisting of a single layer of fiber-containing resin, as shown in FIG. In addition, a composite pipe consisting of four layers and five layers can also be manufactured in the same manner.

In addition to the above-mentioned glass fiber, fiber materials include
Various inorganic or organic fibers can be used. As the inorganic fiber, rock wool, asbestos, etc. can be used, and as the organic fiber, natural or synthetic fiber can be used. For example, cotton, acrylic fiber, polyamide fiber, vinylon fiber, etc. can be used. These fibers may be in the form of mats, tapes, or threads, but preferred are threads, in which a large number of fibers are assembled into a bundle. However, this fiber may be a woven fabric or a non-woven fabric.

As the resin for forming the resin tube, it is desirable to use a thermosetting resin. For example, unsaturated polyester resins, epoxy resins, and vinyl ester resins can be used, and among these, it is preferable to use unsaturated polyester resins.

When it comes to fiber materials and resin, it is preferable to first impregnate the fibers with the resin and then wind the impregnated material onto a spiral tube, but it is also possible to wind the fibers first and impregnate them with the resin later. good.

The resin mortar 10 used in the method shown in FIG. 1 is not limited to this, and may be any intermediate layer molding material made of a mixture of an organic or inorganic filler and a binder. As the organic filler, short pieces of natural or synthetic fibers, pieces of foamed resin, etc. can be used. As the inorganic filler, in addition to sand, calcium carbonate, clay, glass spheres, glass spherical fine hollow bodies, etc. can be used. As the binder, in addition to organic resins such as unsaturated polyester resin, epoxy resin, phenol formaldehyde resin, melamine formaldehyde resin, and urea formaldehyde resin, inorganic binders such as cement, gypsum, and calcium silicate can be used. can. Resin mortar is made by mixing the above-mentioned filler and binder, forming the slurry into a tube shape, and then hardening the binder to form an intermediate layer.

According to the method and apparatus of this invention, it is possible to continuously and easily manufacture a deformed tube made of resin containing fiber material. Moreover, since the fiber material is a continuous long material and is oriented in a spiral manner within the irregularly shaped tube, the obtained irregularly shaped tube has high strength. Further, the irregularly shaped tube is not limited to a single layer, but may also be made of multiple layers. Therefore, by appropriately combining the materials of each layer, composite pipes with various characteristics can be manufactured. Further, by replacing the rotating portion 13 and changing its cross-sectional shape, a cylinder having an oval, oval, or polygonal cross section can be easily manufactured.
Therefore, the method and device of this invention have great practical value.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the method of the present invention together with an apparatus partially cut away.
FIGS. 3 and 4 are enlarged views of cross-sections taken along lines - and -, respectively, in FIG. 2. In the figure, 1 is a stand, 2 is a fixed core rod, 3
4 is an endless belt, 5 and 6 are rolls, 7 is a spiral tube, 8 and 12 are fibrous materials, 9
10 is a roll, 10 is a resin mortar, 11 is an intermediate layer, 13 is a rotating part, 14 is a deformed tube, and 15 is a heating tool. Further, 16 is a shaft, 17 is a ring, 18 is a small ball, 19 is a column, 20 is a bearing, and 21 and 22 are rolls.

Claims (1)

[Claims] 1. A belt-like material is wound around a core rod fixed in a cantilevered manner, and a spiral tube is formed by the belt-like material and moves in a spiral shape, and a fiber material and a curable resin are placed on the spiral tube. In this method, the outer circumferential surface of the tip end of the core rod is rotatable around the axis of the core rod, and the tip of the rotating portion is The feature is that the cross section of the side outer peripheral surface is made into an irregular shape, the uncured tube formed into a cylindrical shape on the fixed side of the core rod is gradually changed into an irregular shape on the outer peripheral surface of the rotating part, and the resin is cured in the irregular shape. A continuous manufacturing method for reinforced resin deformed tubes. 2. After supplying a fiber material and a curable resin onto a spiral tube to form an inner layer tube, an intermediate layer forming material is applied on top of this using a roll to form an intermediate layer, and then a fiber material and a curable resin are applied on top of the inner layer tube. 2. The continuous manufacturing method of a reinforced resin deformed tube according to claim 1, wherein the outer layer tube is formed by supplying a curable resin and then changed into a deformed shape on a rotating part. 3. The core rod is fixed in a cantilevered manner, and a belt-like material is sandwiched around the core rod and wound spirally to form a spiral tube that progresses spirally along the core rod, and a fiber material is wrapped around the spiral tube. In an apparatus for manufacturing reinforced resin pipes that supplies hardening resin, the tip side of the core rod is rotatable around the axis of the core rod, and the cross-sectional shape of the rotating part is made non-circular toward the tip. substantially equal around the fixed side portion of the core rod;
Continuous manufacturing equipment for reinforced resin deformed tubes with a heating tool installed at the tip of the rotating part. 4 Place the roll around the fixed side part of the core rod,
A series of reinforced resin deformed tubes according to claim 3, wherein the roll axis is oriented parallel to the core rod, the rolls are rotated in a direction opposite to the rotation direction of the spiral tube, and the rotation directions are mutually inward. Manufacturing equipment.