JPS6160765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing irregularly shaped tubes, and in particular to a method for continuously manufacturing irregularly shaped tubes made of thermosetting material, and an apparatus for manufacturing the same. Here, the irregularly shaped tube refers to a tube whose cross section is non-circular, for example oval or oval.

BACKGROUND OF THE INVENTION Methods and devices for continuously producing tubes made of thermosetting materials are known. A known method involves, for example, winding an endless belt spirally at least once around a core rod fixed in a cantilevered manner, and sandwiching a long strip between the endless belt and the core rod. Rotate the
The strip is wound around a core rod to form a helical tube that progresses in a spiral pattern. This spiral tube is used as a core mold, and a molding material containing a thermosetting material is brought into contact with the spiral tube to form the tube. This is a method in which the molding material is hardened by heating from the surroundings while the tube moves spirally along the core rod, thereby obtaining the tube. 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, it was not possible to produce irregularly shaped tubes using this known method. Therefore, the inventor attempted to manufacture a deformed tube by improving the above-mentioned method.

In the above-mentioned known method, the inventor made the cross-sectional shape of the core rod irregular, and rotated the core rod in accordance with the rotation of the core die in the circumferential direction. The core mold is held in an irregular shape that matches the core rod by moving only in the longitudinal direction of the core rod without moving it in the opposite direction, and the molding material is applied to a constant thickness on this irregularly shaped core mold. I tried to manufacture a tube. At that time, in order to apply the molding material to a constant thickness on the core mold, one roll facing the core mold is installed parallel to the core mold, and the roll can move forward and backward toward the core mold. A protruding circumferential surface was provided on one side of the roller, and the circumferential surface was pressed against the core mold to maintain a gap equal to the protruding distance of the peripheral surface between the roll surface and the core mold surface. Thereafter, the molding material was applied to a constant thickness on the core mold by rotating the roll in the opposite direction to the core mold and turning the rotation directions inward to each other. As a result, it was confirmed that a deformed tube could be successfully obtained. This invention was born based on such confirmation.

In this invention method, a strip is wound around a core rod supported in a cantilevered manner to form a core mold that moves in the axial direction of the core rod, and a molding material is supplied onto the core mold to form a tube. In this method, the cross-sectional shape of the core rod is made irregular, the core rod is rotated according to the circumferential rotation of the core mold, and the core mold is moved only along the axial direction of the core rod on the surface of the core rod. The core mold is held in an irregular shape, and a roll kept parallel to the core mold is supported by a spring so that it can move forward and backward toward the core mold, and a protruding peripheral surface is provided on the roll surface next to the core rod support, Rotate the roll and core rod inwardly while making contact with the core mold,
It is characterized by supplying a molding material containing a filler and a binder between the roll and the core mold, applying the molding material onto the core mold to form a tube, and then curing the binder. The present invention relates to a method for manufacturing a deformed tube.

The device invention related to the above-mentioned inventive method consists of a belt-shaped material that is fed diagonally toward the tip of the core rod to the side of the core rod that is supported in a cantilevered manner, and a spiral material that is fed to the core rod with the belt-shaped material sandwiched therebetween. An endless belt that rotates while winding around the core, a roll that is maintained parallel to the core rod, and a supply tool that supplies molding material between the roller and the core rod.
In the pipe manufacturing equipment attached in this order, where the support of the core rod is known, the cross section of the core rod is made into an irregular shape so that the core rod can rotate in accordance with the rotation of the endless belt in the circumferential direction. A protruding peripheral surface protruding across the core rod support is provided, and the roll is supported by a spring so that it can move forward and backward toward the core rod, and the roll and core rod are moved inwardly toward each other while the protruding peripheral surface is in contact with the core rod. This is a manufacturing device for irregularly shaped tubes, which is characterized by being rotatable.

An example of the implementation of the present invention will be described below based on the drawings. FIG. 1 is a schematic plan view showing an embodiment of the method of the present invention together with an apparatus. 2 and 3 are cross-sectional views taken along lines - and - in FIG. 1.

In Figures 1 to 3, 1 is a stand, 2 is a core rod, 3 is a long strip, 4 is an endless belt,
5 and 6 are rolls, 7 is a spiral tube as a core mold, 8
1 is a release paper, 9 is a roll, 10 is a protruding peripheral surface, 11 is a support base, 12 is a spring, 13 is a fixed wall, 14 is a molding material supplied from a supply tool (not shown),
15 is a tube, 16 is a curable resin-impregnated fiber bundle, 17 is a heating tool, 18 is a pulling tool, 19 is an outer ring, 20 is an inner ring, 21 is a steel ball, 22 is a support, and 23 is a drawing roll.

In the apparatus shown in FIG. 1, each numbered part has the following relationship. The core rod 2 is supported by the base 1 in a cantilevered manner and is rotatable. Further, the core rod 2 has an irregular cross section, as shown in FIGS. 2 and 3. An endless belt 4 is spirally wound at least once around the support side of the core rod 2 and supported by rolls 5 and 6,
It is rotated in the direction of arrow X. endless belt 4
A strip 3 is sandwiched between the core rod 2 and the endless belt 4, and as the endless belt 4 moves, it is spirally wound around the core rod 2 to form a spiral tube 7. The spiral tube 7 is moved in the direction of the arrow X, and moves spirally around the core rod 2. This spiral tube 7 constitutes a core mold. The cross section of the spiral tube 7 at this time has an irregular shape along the outer periphery of the core rod 2.

In the example shown in FIG. 1, the core rod 2 is rotated in accordance with the rotational speed of the helical tube 7 in the circumferential direction. As mentioned above, the spiral tube 7 moves in a helical manner as a whole, but as a result of the rotation of the core rod 2, there is no positional deviation in the circumferential direction between it and the core rod 2, and only the longitudinal direction It will only move in the direction. Therefore, the spiral tube 7 moves in the longitudinal direction of the core rod 2 while maintaining its deformed shape that matches the core rod 2. Therefore, by supplying a molding material around the spiral tube 7 and molding it into a shape along the spiral tube 7, a deformed tube can be obtained.

In the example shown in FIG. 1, the molding material is not directly supplied onto the spiral tube 7, but a release paper 8 is once wound around the spiral tube 7, and the molding material is supplied onto it.

In the example shown in Fig. 1, the spiral tube 7 is rotating with an irregular cross-section, so special ingenuity is required to apply a molding material such as resin mortar to a uniform thickness on top of the spiral tube 7. Ru. For this purpose, roll 9 is used. The rolls 9 are opposed to each other with their axes oriented parallel to the spiral tube, and are in a relationship in which they mutually rotate inward. Further, the roll 9 is provided with a protruding circumferential surface 10 on one side on the endless belt side, and the protruding circumferential surface 10 rotates while being in contact with the release paper 8. It may be said that the protruding peripheral surface 10 is provided on the side surface of the roll on the side where the core rod is supported in a cantilevered manner. Furthermore,
The roll 9 can move forward and backward toward the spiral tube 7 together with the support base 11 by means of a spring 12. Therefore, as the surface of the roll of release paper 8 has an irregular shape and changes its position with rotation, the surface of roll 9 also changes position, and the surface of the roll of release paper 8 and the roll change accordingly. 9, a gap corresponding to the protrusion caused by the protruding peripheral surface 10 always exists. Therefore, when the molding material is supplied into the gap, the coating is applied to a thickness corresponding to the gap.

In the example shown in FIG. 1, the irregularly shaped tube is made as follows. The endless belt 4 is driven to continuously form the spiral tube 7 and advance in a spiral shape. Further, the core rod 2 is rotated in accordance with the rotation of the spiral tube 7 in the circumferential direction. In this state, the release paper 8 is attached to the spiral tube 7.
The resin mortar 14 is supplied thereon, and the rolls 9 are rotated so as to be mutually inward with respect to the spiral tube. At this time, as described above, a constant gap is always provided between the surface of the roll 9 and the surface of the roll of release paper. In this way, the resin mortar 14 is applied around the spiral tube 7 to a desired thickness to form a deformed tube. If necessary, a glass fiber roving 16 impregnated with polyester resin is further wound thereon to provide a surface layer made of reinforced resin. Thereafter, this irregularly shaped tube is passed through the heating tool 17 and heated to harden the curing agent in the resin mortar, thereby forming an irregularly shaped tube.

The hardened deformed tube is removed from the core rod 2 by being assisted in advancing in the longitudinal direction by a pulling tool 18. The pulling tool 18 at this time has a structure as shown in FIG. The outer ring 19 is fixed, and the inner ring 20 is mounted therein.
is held rotatably. Steel balls 21 are provided between the outer ring 19 and the inner ring 20 to facilitate rotation.
is buried. Inside the inner ring 20, there is a support 2
2 is fixed, and a take-up roll 23 is rotatably attached to the support 22. As shown in the figure, a plurality of take-up rolls 23 are arranged at positions corresponding to the cross-sectional shape of the irregular-shaped tube so as to just contact the outer surface of the irregular-shaped tube, and sandwich the irregular-shaped tube.

Both the inner ring 20 and the take-up roll 23 are forcibly rotated by a power device (not shown).
In that case, the inner ring 20 is rotated in accordance with the rotation of the helical tube 7 in the circumferential direction, and the roll 23 is rotated in accordance with the rotation of the helical tube 7 in the longitudinal direction. As a result of the rotation of the inner ring 20, the roll 23
will be revolved around the irregularly shaped tube. As a result of this revolution, the rolls 23 are both held in contact with the surface of the profiled tube. On top of that, if the roll 23 itself is forced to rotate,
The rolls 23 move the profiled tube in the longitudinal direction of the helical tube, thus making it possible to separate the profiled tube from the core rod.

Note that it is also possible to form a helical tube as a core by using an endless steel belt as the band-like body. In this case, a method is adopted in which the belt is forcibly moved by a drive roll. Alternatively, the core mold can be formed by making the band-shaped body elongated in the longitudinal direction of the core rod, wrapping it around the core rod, and moving it in the longitudinal direction of the core rod.

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

FIG. 1 shows the case of manufacturing an irregularly shaped composite pipe consisting of two layers in which a glass fiber-containing resin layer is provided on a resin mortar layer. but,
This invention and device are based on the resin mortar 1 shown in FIG.
It can also be used when manufacturing a deformed tube consisting of only 4. In addition, it is also possible to further increase the number of layers to produce an irregularly shaped composite tube consisting of three or more layers.

As the molding material, a mixture consisting of an organic or inorganic filler and a binder is used. 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 hollow fine hollow bodies, etc. can be used. As a binder, unsaturated polyester resin, epoxy resin,
In addition to organic resins such as phenol formaldehyde resin, melamine formaldehyde resin, and urea formaldehyde resin, inorganic binders such as cement, gypsum, and calcium silicate can also be used. The molding material is a mixture of the above-mentioned filler and binder, and is made into a slurry to give it plasticity. The molding material is molded into a tube shape, and then the binder is hardened to form a deformed tube.

In the method and device of this invention, the core rod has an irregular cross section, a core mold with an irregular cross section is formed along the surface of the core rod, and the core mold is rotated together with the core rod, so that the core mold changes its cross-sectional shape. It moves on the core rod while making a spiral motion. In this way, the molding material is always applied to a uniform thickness on the formed core mold by the roll, so
Here, a deformed tube with a uniform thickness can be easily obtained. Furthermore, after the irregularly shaped tube is hardened, the irregularly shaped tube is sandwiched between rolls, and while the rolls are rotating, the rolls are revolved around the irregularly shaped tube in accordance with the rotation of the irregularly shaped tube, so that the spiral movement of the irregularly shaped tube can be performed smoothly. This makes molding easier. Thus, according to the method and apparatus of the present invention, it is possible to continuously and easily manufacture a deformed tube corresponding to the cross-sectional shape of the core rod 2. In addition, by changing the cross-sectional shape of the core rod 2 and changing the arrangement position of the rolls in the take-up machine accordingly, it is possible to easily obtain irregularly shaped tubes having elliptical, polygonal, etc. cross-sections. In this respect, the method and device of this invention have great practical value.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the method of the present invention together with an apparatus. FIGS. 2 and 3 are cross-sectional views taken along lines --- and --- in FIG. 1, respectively. In the figure, 1 is a stand, 2 is a core rod, 3 is a strip,
4 is an endless belt, 5 and 6 are rolls, 7 is a spiral tube, 8 is release paper, 9 is a roll, 10 is a protruding peripheral surface, 11 is a support base, 12 is a spring, 13 is a fixed wall,
14 is a molding material, 15 is a tube, 16 is a cured resin-impregnated fiber bundle, 17 is a heating tool, 18 is a pulling tool, 19 is an outer ring, 20 is an inner ring, 21 is a steel ball, 22 is a support column, 23
is the withdrawal roll.

Claims (1)

[Claims] 1. A core mold that moves in the axial direction of the core rod is constructed by winding a belt-like material around a core rod supported in a cantilevered manner, and molding material is supplied onto the core mold to form a tube. In the forming method, the cross-sectional shape of the core rod is made irregular, the core rod is rotated in accordance with the rotation of the core mold in the circumferential direction, and the core mold is moved only along the axial direction of the core rod on the surface of the core rod. The core mold is held in an irregular shape, and the roll maintained parallel to the core mold is supported by a spring so that it can move forward and backward toward the core mold. The roll and core rod are rotated inwardly with their peripheral surfaces in contact with the core mold, and a molding material containing a filler and a binder is supplied between the roll and the core mold, and the molding material is placed on the core mold. 1. A method for manufacturing a deformed pipe, the method comprising forming a pipe by applying a binder, and then curing a binder. 2. After the irregular-shaped tube has hardened, a plurality of rollers are provided to sandwich the irregular-shaped tube, and while the roller group is revolved around the irregular-shaped tube in accordance with the rotation of the irregular-shaped tube, the rollers are forcibly rotated, and the irregular-shaped tube is turned into a core. A method for manufacturing a deformed tube according to claim 1, characterized in that the rod is moved in the longitudinal direction. 3. A belt-like material that is fed diagonally toward the tip of the core rod on the side of the core rod that is supported in a cantilevered manner, and an endless belt that rotates while wrapping the belt-like material in a spiral shape around the core rod, In a tube manufacturing equipment in which rolls maintained parallel to the core rod and supply tools for supplying forming material between the rolls and the core rod are attached in this order so that the support of the core rod is known, the cross-section of the core rod is The surface is irregularly shaped so that the core rod can rotate in accordance with the rotation of the endless belt in the circumferential direction, a protruding peripheral surface is provided on the roll surface that protrudes to support the core rod, and the roll is supported by a spring. A manufacturing device for a deformed tube, characterized in that the roll and the core rod can be freely moved forward and backward toward the core rod, and that the roll and the core rod can be rotated inwardly with respect to each other while the protruding peripheral surface is in contact with the core rod. 4. A pulling tool is attached around the core rod located near the tip of the roll, and the pulling tool includes a plurality of rolls arranged facing the core rod, and a mechanism for rotating these rolls around the core rod. An apparatus for manufacturing a deformed pipe according to claim 3, characterized in that it is provided with: