JPS6145928B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a centrifugal molding device.

A centrifugal molding device inserts a mandrel wrapped with reinforcing fiber cloth in advance into a mold, and then winds the reinforcing fiber cloth of the mandrel onto the inner peripheral surface of the mold while rotating the mold at a predetermined speed. After that, a resin liquid is supplied into the mold to perform the desired centrifugal molding.
The problems with this type of centrifugal molding are:
The key is how to accurately transfer the reinforcing fiber cloth to the inner peripheral surface of the mold. This is because, if this is not done correctly, for example, the reinforcing fiber cloth on the inner peripheral surface of the mold will become wavy, resulting in a decrease in quality. By the way, in order to accurately transfer the reinforcing fiber cloth, it is necessary to firmly hold the reinforcing fiber cloth on the mandrel, and to release the holding instantly when the mold reaches a predetermined rotation speed.

The present invention provides a reinforcing fiber cloth feeding device for a centrifugal molding device that can satisfy the above-mentioned desired points, and one embodiment thereof will be described below based on the drawings.

Reference numeral 1 denotes a cylindrical mold, which is supported by a plurality of rings 2 and is rotatable around a horizontal axis 3. Annular bodies 4 are fitted into both ends of the mold 1, and a molding surface 5 is formed between these annular bodies 4. A mandrel 7 supported by a dolly 6 can be inserted into the mold 1, and ring bodies 8 and 9 are rotatably attached to the tip and base ends of the mandrel 7 via seal members 10 and 11, respectively. . Reference numeral 12 denotes a cylindrical body that is connected between the two ring bodies 8 and 9 and is fitted onto the mandrel 7. Oil 13 is kept in the gap between the mandrels 7 with sealing members 10 and 11 preventing leakage. Enclosed under pressure. This oil 1
3 is to increase the lubrication effect by expanding the thin cylinder 12 under the pressure of the oil 13, and at the same time, machining can be omitted. An air supply pipe 14 in the shape of a crushed pipe is attached to one location in the circumferential direction of the cylindrical body 12, and a plurality of air jet holes 15 are opened at one side of the air supply pipe 14. The air supply pipe 1
4 enters both ring bodies 8 and 9, one opening is closed by one ring body 8, and an air supply device 16 communicating with the air supply pipe 14 is provided on the other ring body 9 side. This air supply device 16 is fitted onto the ring body 9 and is connected to a stay 17.
An annular body 18 supported on the truck 6 side via a ring body 18, an annular groove 19 formed on the outer periphery of the ring body 9, a communication path 20 that communicates this annular groove 19 with the other side of the air supply pipe 14, Annular body 18 to face groove 19
The ejection recess formed on the inner surface of the ejection recess 21
It consists of a communication pipe 22 that communicates with an air supply source (not shown) on the truck 6 side, and seal members 23 disposed on both sides of the annular groove 19 between the ring body 9 and the annular body 18. A coil plate 24 is wound around the cylindrical body 12, and its base end is fixed to the air supply pipe 14, and its free end 24a is at a position where it has been wound one or more times. An elastic force acts on this coil plate 24 in the direction of diameter reduction (tightening). 25 is a bag body into which the coil plate 24 is fitted, and is made of, for example, a rubber sheet. 2
Reference numeral 6 indicates a reinforcing fiber cloth, and 23a indicates its free end.

Before the winding is performed, the reinforcing fiber cloth 26 is previously wound around the mandrel 7 side. At this time, the bag body 25 is deflated, and the wound reinforcing fiber cloth 26 is pressed and held together with the bag body 25 at its free end 24a side by the elastic force of the coil plate 24. In this state, the mold 1 is rotated, and when the rotational speed reaches a predetermined number, air is supplied from the air supply device 16 to the air supply pipe 14. This supplied air is supplied to the air outlet 1
5 into the bag body 25, and inflates the bag body 25 through the coil plate 24 as shown in FIG. Then, the holding by the free end 24a of the coil plate 24 is instantly released, and the free end 26a of the reinforcing fiber cloth 26 hangs down and comes into contact with the molding surface 5. This generates frictional resistance at the free end 26a, and the reinforcing fiber cloth 26 is unwound from the mandrel 7 side and transferred onto the molding surface 5. At this time, a tensile force acts on the reinforcing fiber cloth 26, but this is eliminated by the rotation of both ring bodies 8 and 9 with respect to the mandrel 7.

As described above, according to the present invention, the free end (end of winding) of the reinforcing fiber cloth is firmly held on the mandrel side by the elastic force of the coil plate until the mold reaches a predetermined rotation speed. The reinforcing fiber cloth can be released from its hold by supplying air through the air supply pipe during winding.
This can be done instantaneously over the entire width, and good transfer can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view, FIG. 2 is a vertical side view of the main part, and FIG.
4 are longitudinal sectional front views showing the operating state. 1... Molding mold, 5... Molding surface, 6... Cart, 7
... Core metal, 8, 9 ... Ring body, 12 ... Cylindrical body,
14... Air supply pipe, 15... Air outlet, 16
...Air supply device, 24...Coil plate, 24a...
... Free end, 25 ... Bag body, 26 ... Reinforced fiber cloth, 2
6a...Yui end.

Claims (1)

[Claims] 1. A mandrel that can be inserted into a rotatable mold, a pair of ring bodies rotatably attached to the mandrel,
A cylindrical body connected between both ring bodies and fitted onto the mandrel; an air supply pipe attached to the cylindrical body and having an air outlet; a base end fixed to the cylindrical body and wound around the cylindrical body 1. A reinforcing fiber cloth supplying device for a centrifugal molding device, comprising a rolled coil plate, a bag body into which the coiled plate is fitted, and an air supply device communicating with the air supply pipe.