JP2514215B2 - Multi-layered pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pot for centrifugal spinning, which is tough, does not easily deform, is economical, and has excellent handleability for cakes.

[Conventional technology]

Since a centrifugal spinning pot (hereinafter simply referred to as a pot) is used at a high speed, it is absolutely necessary that there is no deformation of the pot that disturbs the centrifugal force balance.

As a device which meets such a demand, for example, JP-A-59
-137507 is available. This provided some solution to the pot deformation.

However, since the inner wall surface of the pot is rough due to the fiber winding layer, there is resistance when taking out the cake wound in the pot, and a large force is required. It also causes disturbances on the surface of the cake.

In addition, it is actually quite difficult to shape and finish the boundary between the protrusion and the side wall of the pot without protrusions, and if the inner diameter of the protrusion is slightly small, the cake removal performance will be significantly impaired. There was a drawback that it was done.

[Problems to be Solved by the Invention] According to the present invention, the surface of the inner wall layer of the pot is smooth, there is no obstacle for taking out the cake, and the step as seen in the pot of JP-A-59-137507 is generated. Providing fearless pots. In addition, it has a strong structure that does not deform even after long-term use, and provides a highly economical pot.

[Means for solving problems]

The present invention comprises an inner wall layer made of a cast molding of a thermosetting epoxy resin and an epoxy resin having a three-layer fiber winding structure in the order of a parallel layer, an oblique layer and a parallel layer. A multi-layered pot for centrifugal spinning, which has a multi-layered side wall with an outer wall layer, the inner wall layer is integrated with a mandrel, and the fibers of the outer wall layer are carbon fiber filaments.

FIG. 1 shows an example of the pot structure of the present invention. The embodiment pot shown in FIG. 1 is a pot core 5 comprising a cured layer of a thermosetting resin molded by injecting a resin into a mold by a casting method, a compression molding method or the like, and the pot core. Of the thermosetting resin which is formed by the filament winding method and surrounds at least the outer periphery of the side surface portion (outer wall layer 3 ').

The pot core 5 is integrally formed with the mandrel bottom 1, the mandrel tail 2 including the fitting hole 4, and the inner wall layer 3, and is made of an organic or organic material to suppress expansion / contraction and strengthen the hard layer as necessary. It is a thermosetting resin molded product in which inorganic short fibers are randomly oriented mixed or mixed with a hardness improving powder filler such as silica, alumina and titanium oxide. The molding method of the molding core, the type of the thermosetting resin, and the short fibers or the filler can be arbitrarily adjusted by using the technique known in the conventional pot manufacturing.

The outer wall layer 3'is formed by fitting the core body 5 into a rotation supporting die,
The filament is winded and formed by continuous fiber with thermosetting resin attached while rotating.

In order to insert the intermediate product in close contact with the rotary support die with high precision, a groove for air exclusion is provided on the surface.

The continuous fibers forming the outer wall layer 3'are dipped in a resin liquid and then squeezed to have an optimum amount of attached resin, and wound by a manual or automatic traverse mechanism.

The winding method may be oblique or parallel, but it is better to combine them. That is, it is preferable that the parallel layer is formed first, the oblique layer is formed subsequently, and the parallel layer is formed again. Then, it is formed to be slightly thicker than the final outer diameter dimension.

The multi-layer structure referred to in the present invention is clearly distinguished from a two-layer structure formed by simple coating or coating. It is most desirable that the outer wall layer and the inner wall layer have substantially the same thickness, but it is sufficient that the thickness of one of them does not fall below at least 20% of the whole.

The resin used here may be the same as that of the mandrel bottom or the like, or the molding method is different, and thus the resin material may be changed accordingly. However, when using another resin, it is necessary to consider so that the degree of expansion and contraction depending on the temperature conditions will be similar.

The type of thermosetting resin and the type of continuous fiber to be used can be arbitrarily adjusted by using a technique conventionally known in pot production.

Finally, shaving is performed so as to obtain a predetermined outer shape dimension, and the resin liquid can be applied on the surface as necessary.

〔Example〕

 An example of the pot of the present invention will be described below.

A pot core having a thickness of 2 mm was molded by a compression molding method using an epoxy resin containing 10% of carbon fibers cut to an average length of 3 mm. The size of this pot is 190m inside diameter
It was m and the height of the inner wall was 180 mm.

After that, while fitting the core into a rotating support mold and rotating it, winding the carbon fiber filament with the same epoxy resin used for the core into the filament winding while winding it to 3.3 mm in thickness. Turned

After curing, the surface was shaved 1 mm and surface-treated to a total thickness of 4.3 mm
I tried to become.

For 100 pots, the amount of moving gear was measured with Nagahama Cienq Balancing Machine of Nagahama Manufacturing Co., Ltd., but no pots showing an imbalance of 3g or more were found. This measurement was performed at 1500 rpm by using a balance machine H3B type manufactured by Nagahama Seisakusho, rotating a measurement jig by driving a belt from a motor, attaching a pot to the tip of the jig. The imbalance of the measuring jig was corrected in advance, and the measurement surface was the tip peripheral surface of the pot.

Further, a rotary shaft was attached to the fitting hole of this pot, and the amount of deformation was measured by hand using a dial gauge. As a result, there was no occurrence of those having a deformation exceeding 0.3%.

Furthermore, as a result of subjecting 100 of these pots to industrial operation at 7400 rpm for one year, the change in deformation was investigated.
There was no deformation of more than 6 mm, and even the most varied one showed a deformation of only 0.2 mm.

These facts prove that the bot of the present invention is extremely excellent in practical use.

The surface of the inner wall of the pot was very smooth, no obstacles occurred when the cake was discharged, and no disturbance of the surface of the cake occurred.

For comparison, a pot of the same size was manufactured by the method disclosed in Japanese Patent Laid-Open No. 59-137507.

At the time of production of this pot, there was no occurrence of a pot that showed an imbalance of 3 g or more, and the amount of deformation after continuous operation at 7400 rpm for 14 days exceeded 0.5 m / m. Nothing happened.

However, as a result of subjecting 100 pots to industrial operation for one year under the same rotation condition, the two pots reached a deformation of more than 2.0 mm and became unusable within one year. Also 1.0 to 2.0 mm
19% of the cases showed the deformation of the caution area.

Furthermore, the resistance when taking out the cake from the pot was great, and the surface layer of the cake was disturbed and the pot itself was lifted. In addition, the rate of occurrence of a pot where the cake does not come off because the inner diameter of the protrusion is slightly smaller and the finish is 3-5%
It was.

〔The invention's effect〕

As shown in the examples, the pot of the present invention is not easily deformed during long-term operation, has high safety, and is unlikely to cause defects over a long period of time.

Moreover, the surface of the inner wall layer of the pot is smooth, and it is hard to cause a cake-out trouble, and no special treatment for cake-out is required. Further, it has an advantage that it does not cause a step generated at the joint of the projections as seen in the conventional product, and thus has an extremely high practical value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the multi-layer structure pot of the present invention. 1 ... bottom part, 2 ... tail part, 3 ... inner wall layer, 3 '...
Outer wall layer, 4 ... Fitting hole, 5 ... Pot core.

Claims (1)

(57) [Claims] 1. An epoxy resin having a three-layer fiber winding structure in which an inner wall layer made of a cast product of a thermosetting epoxy resin and a parallel layer, an oblique layer, and a parallel layer are laminated in this order. A multi-layered pot for centrifugal spinning, characterized in that it has a multi-layered side wall with an outer wall layer consisting of, the inner wall layer is integrated with a mandrel, and the fibers of the outer wall layer are carbon fiber filaments.