JPS61284408A - Manufacture of base material layer - Google Patents

Abstract

PURPOSE:To obtain an excellent mechanical strength in an axial direction, by winding up fibrous base materials in a plurality of kinds of widths round the external circumference of a tapered mandrel extending to a large diameter side of the mandrel from a small diameter side of the same while the base material is being shifted little by little along taper by varying the width according to a variation of the the taper and a base material layer of the mandrel. CONSTITUTION:For a glass base material layer 6a, a substance which is begun to wind from a mandrel side, whose diameter is small, and which is in width la is wound up round the mandrel while the material layer 6a is being shifted rightward little by little along taper, in the manufacturing of the base material layer which is used for a high-pressure gas pushing insulating tube and a terminal insulating cylinder of a high-pressure cable and is used for the manufacturing of a tapered cylinder made of glass fiber reinforced plastics (GFRP). Next to the above, a glass base material whose width is narrower (width lb) than the width la is wound up round the mandrel up to the outside diameter position of a large diameter side of the mandrel. Then a glass base material whose width is lc is wound up at a fixed position without shifting the same. Then it is kept somewhat thicker than a final finished measure and then cut off into a predetermined measure after cure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is used for insulating tubes of high-pressure gas bushings, terminal insulating tubes of high-voltage cables, and the like. The present invention relates to a method for manufacturing a base layer used in manufacturing a tapered glass fiber reinforced plastic (GFRP) cylinder.

(Prior Art) FIG. 5 is a longitudinal sectional front view showing an example of tapered GFRP paper. Here, a tapered GFR with constant wall thickness, P
It has a practical structure in which seven flange fittings 2a*2b are attached to both ends of the cylinder 1.1 The present invention provides a method for manufacturing a base material layer used for the main body, which is a tapered GFRP cylinder IK. .

Traditionally, the manufacturing method for non-tapered GFRP strips has been to manufacture them on the outer periphery of a cylindrical iron mandrel.

The filament winding method involves wrapping a bundle of glass rovings at a predetermined angle, or the bag wrapping method involves wrapping a wide base material corresponding to the entire length of the GFRP paper. The tape winding method, in which a narrow tape is fed from side to side while being lap-wound, is not recommended because the glass fiber of the base material is cut at the edge of the tape and becomes discontinuous, which weakens the mechanical strength in the axial direction. However, it has not been adopted.

However, the tapered GFRPIi! In the cylinder, it is necessary to form a base material layer around the outer periphery of the mandrel, which has different thicknesses on the left and right sides. Therefore, it is not possible to wrap a wide base material in a bag. Also, in the case of the filament winding method, in which a bundle of glass rovings is wound at a predetermined angle, it is tapered.

In order to keep the winding angle constant, it is necessary to slightly change the transverse feed pitch of the glass roving depending on the left and right positions, which is particularly difficult when the winding angle in the circumferential direction is large. Furthermore, if the pitch of the cross-feeding sheets is kept constant, the winding angle changes with the taper, making it impossible to obtain uniform mechanical strength.

A conceivable method for producing tapered GFRP paper, which is an extension of the conventional technology, is a tape winding method in which a narrow width (less than 50 cm wide) tape is wrapped while being fed from side to side. FIG. 6 is a front view illustrating this tape winding method. Final product tapered GF 几P! Around the tapered mandrel 3, which has an outer diameter that matches the inner diameter of the R cylinder,
A predetermined base material layer 5 is formed by wrapping the narrow glass base material tape 4 while feeding it from side to side. Finally, both ends and the outer diameter are machined to create a tapered G as shown in Figure 5.
Obtain an FRP cylinder 1.

However, in this tape winding method, if the tape width is wide (for example, 100 mm or more), the tape does not fit well to the shape of a part of the taper during lap winding, resulting in wrinkles and gaps between the nine layers.

Furthermore, if the tape width is narrowed, such defects will not occur, but the mechanical strength in the axial direction will become weaker.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for manufacturing a base material layer that eliminates the above-mentioned drawbacks and can easily manufacture a tapered GFRP cleft tube with sufficiently high mechanical strength in the axial direction. The purpose of the present invention is to fabricate a fibrous base material of multiple widths outside of a tapered mandrel.
It is characterized by changing the width of the fibrous base material according to the change in the taper of the mandrel and the thickness of the base material layer from the side with a smaller diameter of the mandrel to the side with a larger diameter, and winding it while shifting it slightly along the taper. The present invention relates to a method for manufacturing a base material layer.

After forming the base layer, the base layer is impregnated with a thermosetting resin composition and cured by heating, as in the conventional method.
The mandrel is pulled out and the outer diameter and end portions are processed to form a tapered GFRP tube.

As the fibrous base material, glass cloth, glass roving cloth, glass mat, etc. are used.

For this base material, base materials with multiple types of widths are used, and the width is 1
00 yen or more is preferable.

Fibrous base materials of a plurality of widths are rolled up around the outer periphery of a tapered mandrel; for example, base materials of different widths are rolled up on a flat portion and a tapered portion of the mandrel. Further, the width of the base material can be changed depending on the change in the wall thickness of the obtained GFRP paper.

Depending on the wall thickness obtained in the tapered part.

Substrates of different widths may be rolled up. A wide base material can be rolled up on the thick part.

As the thermosetting resin composition impregnated into the base material layer, an epoxy resin composition, a bismaleimide triazine resin composition, an incyanurate oxazolidone resin composition, etc. are used. Impregnation with a thermosetting resin composition is generally carried out by vacuum impregnation.

The present invention will be described in detail.

(Example) FIG. 1 is a longitudinal sectional front view showing the structure of a glass base material layer of a tapered GFRP paper sheet according to an example of the present invention. In the figure, glass substrates of multiple widths are wound around the outer periphery of a tapered mandrel by dividing it into three blocks. The width of each glass substrate is e, la, lb.
* and lc.

First, the glass base material layer 6a is rolled up starting from the mandrel side with the smaller diameter, and the glass base material layer 6a having a width of 2 a is gradually shifted to the right along the taper. Next, the glass substrate, which is much narrower (width l!b), is rolled up to the position of the outer diameter of the mandrel on the larger diameter side, while also shifting it little by little to the right along the taper. Here, the glass base material of the same @la may be rolled up to this position continuously from the base material layer 63, but in this case, considering the final finishing dimensions of the GFR, P cylinder, the machining allowance is not enough. It needs to be bigger.

Next, a glass substrate having a width of 1 c is rolled up in a fixed position without shifting. The base material layer formed in this manner may be made larger than the final finished size of the GFRP paper, and after curing may be cut out to a predetermined size.

Figure 2 shows 9 widths I! around mandrel 3! FIG. 6 is a front view showing the process of forming a base material layer 6b by rolling up the wide glass base material 7 of FIG.

Next, FIG. 4 shows an example of the structure of the base material layer when manufacturing a tapered GFR, P cylinder with wall thicknesses that vary depending on the inner diameter, as shown in a longitudinal sectional front view in FIG. 3. This is shown in the vertical front view. In this case, the 2 widths are each lap 1eet! f,
Jg and I! Using the base material of h, 6d, Set6f
It is sufficient to configure p6g and 6h base material layers.

(Effects of the Invention) In the present invention, since the base material layer is constructed using base materials with multiple widths, the fibers are not discontinuous compared to the case where a narrow base material is wound with tape. Provides excellent mechanical strength in both directions. In addition, in the case of tape winding, it is necessary to measure the thickness at each position during the process in order to adjust the thickness of the base material layer to a predetermined thickness at a predetermined position, but with the method of the present invention, If the base material width of each base material layer is determined first, each base material layer may be formed to a predetermined thickness. In addition, when the number of laminated layers per unit thickness is kept constant, the total number of laminated layers of each base material layer (the number of rotations of the tab mandrel) may be controlled.

As described above, the method for manufacturing the base material layer of the present invention is simple and optimal for obtaining a homogeneous tapered GFRP tube with excellent mechanical strength.

[Brief explanation of drawings]

Figures 1 and 4 are the tapered GFRP II of Figures 5 and 3, respectively! Figures 2 and 6 are longitudinal sectional front views showing the structure of the base material layer according to an embodiment of the present invention, respectively, for making a cylinder. 3 and 5 are longitudinal sectional front views showing examples of tapered GFRP paper. Explanation of symbols 1...Tapered GFR, P cylinder 2 at 2 t)...7 Lunge fitting 3...
・Mandrel 4...Narrow glass base tape 5・
...Base material layers 6a, 6b, 6c...Wide glass base material layer 7...Glass base material Figure 1 Stalk 2 Mouth rod + Mouth

Claims (1)

[Claims] 1. A fibrous base material of multiple widths is placed around the outer circumference of a tapered mandrel, from the smaller diameter side of the mandrel to the larger diameter side, depending on the change in the taper of the mandrel and the thickness of the base material layer. A method for manufacturing a base material layer, which is characterized by changing the width of the base material and rolling it up while slightly shifting the base material along a taper.