JPH04464B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a curved pipe forming method and apparatus.

Conventional technology When molding a resin curved pipe with a socket at one end, conventionally a core bar having a socket part and a curved pipe body integrally is used, and a roving is wound around this core bar. After curing, it is common to remove the mold by drawing it out.

Problems to be Solved by the Invention By the way, when demolding a curved tube by drawing, the formed tube must be moved along a curved path along the axis of the core metal. However, there is a problem in that the socket of the formed tube gets in the way, making it difficult to pull it out. In addition, there is a problem in that a tube having sockets at both ends cannot be demolded.

Therefore, the present invention aims to make it possible to easily demold a curved pipe made of resin that has sockets, and to also enable easy demolding of a curved pipe that has sockets at both ends. purpose.

Means for Solving the Problems In order to achieve the above object, the method of the present invention brings the end face of the headless bent pipe body into contact with the end face of the socket core metal, and connects this curved pipe body with the socket core metal. While fixing on the same axis and rotating the socket core and the bent pipe body together,
A roving is wound around the socket core and the end of the bent pipe body following the socket core.

Further, the device of the present invention includes a socket mandrel, a chuck device that grips a headless bent pipe body from the inner surface and fixes the socket mandrel on the same axis continuous to the socket mandrel, and In order to wrap the roving around the end of the tube body, the tube has a rotation drive device that rotates the socket core and the bent tube body together.

With such a structure, the socket is formed using only the socket core metal after forming the bent pipe body, so even if the bent pipe has a socket, it cannot be easily pulled out. It can be molded, and even a bent pipe having sockets at both ends can be easily demolded.

Examples Examples of the present invention will be described below. Fourth
The figure shows a core metal device for forming a bent pipe main body 1, and 2 is a cylindrical core metal body formed at 90 degrees. Core metal receiving flanges 3 are attached to both ends of this core metal body 2, respectively. The core metal receiving flange 3 is provided with a bracket 5 for attaching the rotating shaft 4, and the core body 2 is rotatable around the axis 6 of the rotating shaft 4.

5 and 6 show a core metal device for forming the socket 7 of the pipe. Here, 8 is the socket core metal,
It is mounted on a turntable 9 as a rotation drive device shown in FIG. 3, and is adapted to be rotated in a horizontal plane. A chuck device 11 is provided on the upper end surface 10 of the socket mandrel 8, and the chuck device 11 is installed in a state in which the end surface 12 of the bent pipe main body 1 is brought into contact with the end surface 10 of the socket mandrel 8, that is, the state in which the bent pipe main body 1 is received. The bent pipe main body 1 can be fixed coaxially with the socket core 8 while standing upright on the socket core 8.

In this chuck device 11, 13 is an end face 1
0, and 14 is the socket core bar 8.
This is a movable pawl that is movable in the radial direction. 15
is a screw shaft for moving the movable claw 14, and a pair of receiving metal fittings 16 provided on the end surface 10.
It is screwed through and rotatably connected to the movable claw 14. 17 is a nut fixed to the screw shaft 15 so that a spanner or the like for rotating the screw shaft 15 is engaged therewith.

Next, the method of forming the tube will be explained. First, the core body 2 is set as shown in FIG. 4, and the roving 18 is wound around the core body 2 while rotating it around the axis 6 as shown in FIG. Reference numeral 19 denotes a head for feeding out the roving 18, which is capable of reciprocating on a path 20 parallel to the axis 6 and rotatable around an axis perpendicular to the path 20 and perpendicular to the feeding direction of the roving 18. There is. Thereby, the roving 18 is always wound at right angles to the curved central axis of the core body 2.

As a result of the above, the bent pipe main body 1 is similar to the core metal main body 2.
Since it is formed at 90 degrees, after removing the flange 3 from the core body 2, the bent pipe body 1 is pulled out in the direction of the curved axis of the core body 2 to be demolded. After demolding is completed, if necessary, the curved pipe main body 1 is cut at a required angle using a cutter 21, as shown in FIG.

Next, as shown in FIGS. 3 and 6, the claws 13 and 14 of the chuck device 11 are opened and closed in accordance with the inner diameter of the bent pipe main body 1, and the bent pipe main body 1 is fitted onto both claws 13 and 14, The end surface 12 of the bent pipe main body 1 is brought into contact with the end surface 10 of the socket core bar 8. As a result, the bent pipe body 1
is set coaxially with the socket core bar 8, and the claws 13,
14, it is fixed to the extent that it does not fall off from the socket core bar 8. Alternatively, the movable claw 14 may be firmly fixed by inserting a hand through the upper opening of the curved pipe main body 1 and turning the screw shaft 15 to press the movable claw 14 against the inner surface of the curved pipe main body 1.

Once the bent pipe main body 1 is fixed to the socket core bar 8, slowly rotate the turntable 9 to rotate the socket core bar 8 and the bend pipe main body 1 together, and the socket core bar 8
A roving 22 is then wrapped around the end of the bent pipe main body 1 following the socket core 8 to form the pipe socket 7. Once the socket 7 is hardened, if necessary, move the movable claw 14 back inside, pull out the socket 7 from the socket core 8, and remove it from the mold.

At this time, it is necessary to pull out only the socket 7, which has the advantage of being easier to work with and easier to demold than when pulling out the entire tube. Furthermore, it is also possible to form sockets 7 at both ends of the bent pipe main body 1.

Effects of the Invention As described above, according to the present invention, even a curved pipe with sockets can be easily pulled out and demolded, and even a curved pipe with sockets at both ends can be easily demolded. It can be done.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of an embodiment of the method of the present invention, and FIG. 4 is a diagram showing a core metal device for forming a bent pipe body.
FIG. 5 is a plan view of one embodiment of the apparatus of the present invention, and FIG. 6 is a front view thereof. DESCRIPTION OF SYMBOLS 1... Bent pipe body, 8... Socket core, 9... Turntable (rotary drive device), 10... End face, 1
1...Chuck device, 12...End face, 18, 22
...Roving.

Claims (1)

[Scope of Claims] 1. The end surface of the headless bent pipe main body is brought into contact with the end surface of the socket mandrel, and this bent pipe main body is fixed coaxially with the socket mandrel, and the said socket mandrel and A method for forming a curved tube, comprising wrapping a roving around a socket core and the end of the curved tube main body following the socket core while rotating the curved tube body integrally. 2. A socket mandrel, a chuck device that grips the headless bent pipe body from the inner surface and fixes it on the same axis continuous to the socket mandrel, and A curved tube forming device characterized by having a rotation drive device that rotates the socket core and the curved tube body together in order to wrap the roving.