JPS61290040A - Molding method for bent pipe made of resin - Google Patents

Abstract

PURPOSE:To contrive an improvement in productivity and stabilization in quality by preventing a useless reciprocating movement of a roving, by so constituting the title method that a winding surface of the roving crosses always at right angles with an axial tangent line of a core metal at a winding position. CONSTITUTION:As for a core metal 1 of a bent pipe, an end part in a longitudinal direction is fitted turnably on an end part of a shaft 3 through a connecting part 2. A turning range of the core metal 1 of the bent pipe is set up to the extent of its corner. The other end part in a longitudinal direction of the core metal 1 of the bent pipe is fitted turnably to an end part of an expansion and contraction shaft 6 by a connection part 5 and the other end part of the expansion and contraction shaft 6 is fitted turnably to a shaft 8 by a connection part 7. A roving 17 is so constituted that it is wound round the core metal 1 of the bent pipe after it has been passed through a resin path 18. a winding surface of the roving 17 can be made into a thing crossing at right angles with an axial tangent line of the core metal at a winding position by making the core metal of the bent pipe turn. Therefore, favorable winding can be performed without reciprocating the roving largely in the longitudinal direction of the core metal.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for molding a bent resin pipe.

Conventional technology The conventional methods for molding curved pipes made of resin such as FRP include: ■ Ebi-join method, in which diagonally cut straight pipes are joined and molded; ■ Layering resin layers by hand on the core of the curved pipe. There are two methods: a hand lay-up method for forming, and a method of rotating a curved pipe core around its axis and wrapping roving around it. Among these methods, the method (3) of rotating the bent pipe core metal can be automated and is an excellent method for stabilizing quality and reducing man-hours. In this conventional method of rotating a curved tube core, a rotation axis parallel to the tangent to the central axis of the curved tube core is set at the longitudinal center of the curved tube core, and the rotation axis is rotated around this rotation axis. The roving is wrapped around the bent pipe core while rotating it.

Problems to be Solved by the Invention However, with such conventional methods, the work can be carried out smoothly when winding the roving around the part where the axial tangent of the core metal is parallel to the rotation axis, that is, the central part of the core metal. However, as one approaches both ends of the core metal, the axial tangent of the winding portion becomes angular with respect to the rotation axis. As a result, the angle between the rotating shaft and the surface on which the roving is wound deviates from 90 degrees, so unless the roving is moved back and forth in the length direction of the core metal each time the core metal rotates, the winding can be done properly. The problem arises that it cannot be carried out. Therefore, problems still remain in improving productivity and stabilizing quality.

The present invention solves these problems by ensuring that the winding surface of the roving is always perpendicular to the axial tangent of the core metal at the winding position, thereby preventing wasteful reciprocating movement of the roving.
The purpose is to improve productivity and stabilize quality.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides for a curved pipe core rotating around its axis to be rotated around one longitudinal end of the curved pipe core while rotating the outer surface of the curved pipe core. The roving is wrapped around the roving.

Effect By doing this, by rotating the curved pipe core metal,
Since the winding surface of the roving can be made perpendicular to the axial tangent of the core metal at the winding position, good winding can be performed without the need for large reciprocating movements of the roving in the length direction of the core metal. .

Examples Examples of the present invention will be described below. Figures 1-2
The figure shows one embodiment of the present invention, in which (1) is a curved pipe core metal, one end of which in the longitudinal direction is rotatably attached to the end of a shaft (3) by a connecting part (2). . This curved pipe core (1)
The turning range of the vehicle is set to be about the same as the turning angle range. (4) is a motor for rotationally driving the shaft (3).

The other end of the curved pipe core (1) in the length direction is rotatably attached to one end of the telescoping shaft (6) by a connecting portion (5), and the other end of the telescoping shaft (6) is , shaft (8) by connecting part (7)
It is rotatably mounted on the The shaft (8) is positioned in the thrust direction by appropriate means and supported by a bearing (9). The telescoping shaft (6) is shaped so that its length can be changed by the air cylinder structure, and the telescoping shaft (
6) is provided with an air port QO communicating with.

A turning direction selection device (6) is provided near the connecting portion (7). That is, by expanding and contracting the telescopic shaft (6), the curved pipe core (1) turns around the connecting part (2), but this turning direction selection device (b) easily controls the rotation direction when turning. It is set up so that you can pass through the dead center. Here, the oscillating arm is arranged within the rotating plane of the curved pipe core metal (1), and its center part oscillates around the pin located on the axis (8) side of the connecting part (7). It is said to be able to move freely. One end (14A) and the other end (
14B), a pair of switching bars (15A) (15B) arranged parallel to the shaft (8) are connected, and a pair of switching bars (15A) (15B) are connected to the telescopic shaft (6) part separated from the connecting part (7). Tension springs (16A) (16B) are connected.

α is a roving, which is wound around the curved pipe core metal (1) after passing through resin bath 4.

In addition, the resin bath (G) is attached to the curved pipe core metal (
1) It is configured to be movable in the length direction.

The connecting portion (2) has a universal joint structure so as to be able to transmit only rotational force, that is, to prevent the curved pipe core (1) from swinging around the central axis of the shaft (3), and has the above-mentioned structure. A structure that allows rotation is adopted.

In such a configuration, when forming a curved pipe, first, as shown in FIG.
) while pushing the switching bar (15A) connected to the other end (14B) and pulling the switching bar (15B) connected to the other end (14B), extend the telescopic shaft (6). Then, the telescopic shaft (6) is pulled by the tension spring (16B), so that the connecting portion (5)
is tilted toward the guide 01 side, and the central axis at one end side of the curved tube core metal (1) comes into contact with its rotation axis.

Therefore, the curved tube core metal (1) is rotated as shown in 1, and the winding of the roving αη is started from one end side of the curved tube core metal (1).

Next, when the telescopic shaft (6) is gradually contracted, the curved pipe core (1) rotates and the connecting part (
2) Turn around. As a result, the curved pipe core metal (1
) is where the central axis of the curved pipe touches the rotating shaft (1).
In order to gradually move from one end toward the other end, the resin bath (g) is similarly moved along the guide a9rc. Then, the winding surface of the roving αη can always be kept perpendicular to the axial tangent of the curved tube core metal (1) at the winding position, making it possible to perform good winding.

Before the dead point of turning, that is, before the total length of the telescopic shaft (6) becomes the minimum, the turning direction selection device 0 is switched to the opposite side as shown in FIG. As a result, the expansion/contraction @ (6) is pulled by the tension spring (16A) on the opposite side to the above, so that the dead center can be easily passed.

After passing through the dead center, by extending the telescopic shaft (6) again, the curved pipe core (1) is subsequently turned in a predetermined direction.

. 8 to 4 show other embodiments of the present invention. In this example, a pivot shaft (1) whose overall length does not change is used instead of the telescopic shaft (6) described above, and the shaft (8) can be reciprocated in its length direction together with the pivot direction selection bag a (2). It is structured as follows. With such a structure, the curved pipe core (1) can be turned by reciprocating the shaft (8) in its length direction. Other operations are similar to those shown in FIGS. 1 and 2.

Effects of the Invention As described above, according to the present invention, the winding surface of the roving can be always perpendicular to the axial tangent of the core metal at the winding position, so that the roving can be oriented in the longitudinal direction of the core metal. Good winding can be performed without large reciprocating movements, and as a result, productivity can be improved and quality can be stabilized.

[Brief explanation of the drawing]

1 and 2 are diagrams showing one embodiment of the present invention, and FIG.
4 and 4 are diagrams showing other embodiments of the present invention.

Claims (1)

[Claims] 1. A method for forming a resin curved pipe, which is characterized by wrapping a roving around the outer part of the curved tube core while rotating the curved tube core rotating around its axis around one longitudinal end of the core. .